2

This preliminary DWA provides estimated drinking water concentrations (EDWCs) based on 

Tier I groundwater and Tier II surface water model simulations for currently registered uses of 

chlorpyrifos provided on the most recent label data report provided by BEAD2as well as recent 

revisions to chlorpyrifos labels (updated since 2/6/2009—as noted). This preliminary DWA also 

considers monitoring data from several different programs. 

EDWCs are provided for chlorpyrifos and chlorpyrifos-oxon, a known transformation product of 

chlorpyrifos. EDWCs for chlorpyrifos-oxon were derived from EDWCs calculated for 

chlorpyrifos because there are limited environmental fate data available for chlorpyrifos-oxon 

and chlorpyrifos is expected to transform to chlorpyrifos-oxon during drinking water treatment. 

Chlorpyrifos EDWCs were multiplied by 0.9541 (molecular weight correction factor) and 100% 

(maximum conversion during water purification) to generate chlorpyrifos-oxon EDWCs. A

100% conversion factor for the oxidation of chlorpyrifos to chlorpyrifos-oxon was used as a 

conservative approximation based on bench scale laboratory data that indicate chlorpyrifos 

rapidly oxidizes to form chlorpyrifos-oxon almost quantitatively during water treatment.

3

Currently, there are no data available on the removal efficiency of chlorpyrifos prior to 

chlorination or the removal efficiency of chlorpyrifos-oxon after formation. Stability studies 

indicate that once chlorpyrifos-oxon forms little transformation is likely to occur between water 

treatment and consumption (drinking water distribution). It is possible that some drinking water 

treatment procedures such as use of granular activated carbon filtration and water softening 

(increased rate of chlorpyrifos-oxon hydrolysis at pH > 9) may reduce the amount of 

chlorpyrifos-oxon in drinking water.

4

It is unlikely, however, that these treatment processes 

completely remove chlorpyrifos-oxon from drinking water. In addition, these treatment methods 

are not typical practices across the country for surface water. For these reasons, 100% of the 

chlorpyrifos making it into the treatment plant is assumed to be converted to the oxon, which 

ultimately ends up in drinking water. Thus chlorpyrifos-oxon is the residue of concern for 

drinking water. Another degradation product of chlorpyrifos, 3,5,6-trichloro-2-pyridinol (TCP) 

included in previous DWAs is not examined in this assessment as requested by the Health 

Effects Division (HED) as it is no longer considered in the human health assessment as a 

degradate of toxicological concern.5 

It is important to note that there are several uncertainties associated with this drinking water 

assessment. As a result assumptions were made in order to complete this preliminary DWA. All 

input parameter assumptions used in this assessment are discussed in detail in the Analysis

section of this document; however, a summary of these uncertainties, assumptions and the likely 

impact on this DWA are highlighted below.

 

2 Chlorpyrifos (059101) Label Data Report, February 6, 2009.

3 Duirk, S. E.; Collette, T. W.; Degradation of Chlorpyrifos in Aqueous Chlorine Solutions: Pathways, Kinetics, and 

Modeling. Environ. Sci. Technol., 2006, 40(2), 546-550.

4 Progress Report on Estimating Pesticide Concentrations in Drinking Water and Assessing Water Treatment 

Effects on Pesticide Removal and Transformation: A Consultation. FIFRA Scientific Advisory Panel Meeting, Sept 

29, 2000; SAP Report No. 2001-02 February 12, 2011.

5 Email from Danette Drew (EPA/HED) to Rochelle Bohaty (EPA/EFED), September. 21, 2010.
3

While the predominate water treatment method used to disinfect drinking water 

throughout the United States is chlorination, there are other treatment methods that may 

reduce chlorpyrifos or chlorpyrifos-oxon exposure concentrations. For facilities that 

utilize alternative methods, the laboratory data showing 100% conversion of chlorpyrifos 

to chlorpyrifos-oxon during water purification may not be applicable. Therefore, the 

chlorpyrifos oxon exposure values presented here may be overestimated for those 

facilities. Additionally, the oxon may be partially removed with certain treatment 

processes. In order to reduce the uncertainty associated with the EDWCs reported in this 

DWA, additional data including both targeted monitoring data as well as data on the 

removal efficiency of chlorpyrifos and chlorpyrifos-oxon during treatment is needed. 

This assessment does not take into account the potential loss of mass (either chlorpyrifos 

or chlorpyrifos-oxon) during treatment from methods such as activated carbon, 

sedimentation, water softening, etc., as these treatment methods as well as the sequence 

of these treatment methods vary considerably across the country. Therefore, for systems 

that do utilize such treatment methods, the EDWCs reported in this assessment may be 

higher than the likely exposure concentrations in drinking water. The amount of 

overestimation is unknown, as currently there are no data available on the removal 

efficiency of either chlorpyrifos or chlorpyrifos-oxon by these various treatment methods 

and sequences of treatments. The exception is for water softening where laboratory data 

can be used to calculate the rate of hydrolysis under water softening conditions (pH ≥ 11) 

for both chlorpyrifos and chlorpyrifos-oxon. Water softening, however, is not a common 

treatment process for surface water. 

Chlorpyrifos is registered for use on turf (including sod farms, golf courses, road 

medians, and industrial areas), therefore, a percent cropped area (PCA) of 1 (100% of the 

watershed is treated) was applied to the modeling results in order to cover the use on nonagricultural land. If chlorpyrifos was not registered on turf, the default PCA value of 0.87 

(87% of the watershed is treated) would have been used. EFED is currently working on 

developing crop specific PCAs. For the final DWA, a turf specific PCA may be available 

to help further refine this assessment. This assessment is national in scope covering 

multiple chlorpyrifos uses; therefore, it does not take into account regional PCA values 

(e.g., 0.87 for Missouri, 0.82 for Ohio, 0.07 for Upper Colorado, etc.) or PCA values that 

represent only a single or a few crops (e.g., 0.46 for corn, 0.83 for corn and soybean, 

etc.). 

The monitoring programs analyzed for this drinking water assessment do not specifically 

target chlorpyrifos. Consequently, detections cannot be directly associated with a 

particular use pattern or site, nor are the detections expected to represent the potential 

peak chlorpyrifos or chlorpyrifos-oxon exposures. In order to reduce uncertainties and 

help refine the current exposure assessment, EFED is seeking to incorporate targeted 

monitoring data in its drinking water assessment. 
4

In addition to the uncertainties listed above, there are uncertainties and/or assumptions associated 

with labeling and use rates. Each are listed below, along with the potential impact on the DWA.

Meteorological data and crop profiles, as well as best professional judgment, were used 

to establish an application date for modeling; however, the selected date may not 

represent the intended or actual application dates. The application date used for model 

runs can significantly alter the EDWCs; thus, EDWCs reported could over or under 

predict the potential exposure. For some chlorpyrifos use scenarios several application 

dates were evaluated. In general, the date that provided the most conservative EDWCs 

and corresponded to the appropriate pest pressure are reported. A brief examination of the 

variation in peak EDWCs for some of the multi-run scenarios ranged from 3-23% for 

peak EDWCs. Scenarios examined included those that resulted in high and low EDWCs. 

Based on this limited examination, the application date chosen for modeling can change 

the peak EDWCs by as much as 23%. This is only an estimate and may vary depending 

on the scenario (soil and metrological data) and may not represent all chlorpyrifos use 

scenarios. 

Many chlorpyrifos labels include application restrictions on a per season basis; however, 

for some crops there can be multiple seasons per year. For modeling purposes one season 

was considered to be equal to one year unless otherwise noted. If multiple crop seasons 

are possible per year it is conceivable that the EDWCs reported in this document may 

underestimate the actual exposure. In general, this assessment makes conservative 

assumptions regarding re-cropping and rotations. EFED evaluated a number of labels for 

specific information regarding application methods and timing, and noted some 

application rates provided on the label are on a per season basis. The yearly application 

rates used in this assessment are primarily based on data from BEAD’s label data report.

The typical use data provided by BEAD to date do not inform this uncertainty as the 

typical use rate information was not provided for crops that may have multiple seasons 

per year. 

Some of the labels do not provide maximum single or annual application rates for 

chlorpyrifos or application retreatment intervals. When this information is not specified 

on the label, a conservative application scenario was developed and modeled. For 

example, several labels permit trunk sprays (e.g., some orchard fruit and nut trees such as 

apples and almonds), at a dilution rate in lbs a.i./100 gallons of water; however, the 

amount of the dilution that can be applied is not stated on the label. The application rate 

was assumed to be lb a.i./a. It is unclear if this approach is representative of the intended

or actual use scenarios. However, we did find that the average typical application rate 

provided by BEAD for apples was consistent with the assumed application rate for apples 

(trunk drench) made for modeling purposes. The extent to which actual use rates may be 

different is uncertain. 

Some labels restrict the amount of a specific chlorpyrifos formulation; however, the total 

amount of chlorpyrifos that can be applied per year is not provided. Therefore, the use of 
5

multiple chlorpyrifos-containing products is possible. This assessment does not consider 

the combined use of multiple chlorpyrifos containing products that contain such 

language, but if such use occurs the reported EDWCs in this assessment may not account 

for this event. 

Application rates (maximum single applications and yearly/seasonal) vary between 

labels. Recently approved labels better define chlorpyrifos use; however, there are still 

several older active labels that do not provide application restrictions or have higher 

maximum single and/or yearly applications rates than recently approved labels. The most 

conservative scenarios (highest applications rates) were modeled unless otherwise noted.

In order to reduce the uncertainty associated with the EDWCs reported in this 

preliminary DWA, all chlorpyrifos labels should be updated to clearly state maximum 

yearly and single application rates, as well as minimum retreatment intervals. 

Based on modeling results, EDWCs for chlorpyrifos and chlorpyrifos-oxon generated from 

surface water sources provide higher estimates of the potential exposure to either of these 

chemicals in drinking water than those from groundwater. Depending on the use scenario, tier I

groundwater EDWCs range from 0.1-1.1 μg/L and 0.1-1.0 μg/L for chlorpyrifos and

chlorpyrifos-oxon, respectively.

6

Tier II chlorpyrifos-oxon EDWCs for grapes, corn/soybean and sugar beets are provided in 

Table 1. Grape, corn/soybean, and sugar beet were singled out for this preliminary drinking 

water assessment as representative crops because there is a large amount (>100,000 lb) of 

chlorpyrifos applied to these crops per year, a substantial portion (percent crop treated/percent 

crop planted) of these crops are treated with chlorpyrifos, or the use locations are distributed 

throughout the United States. In addition, the reported EDWCs for grapes, corn/soybean and 

sugar beets are generally representative of the other chlorpyrifos use scenarios modeled when 

EDWCs are compared. Because chlorpyrifos is registered for use on turf (including sod farms, 

golf courses, road medians and industrial areas) a percent cropped area (PCA) of 1 (considers 

100% of watershed is treated with chlorpyrifos) was applied to all modeling results. The PCA 

adjusted EDWCs are reported.

 

6 SCI-GROW provides a single output value that represents the concentrations that might be expected in shallow 

unconfined aquifers under sandy soils. Output is recommended for both acute and chronic endpoints.
6

Table 1. Estimated Drinking Water Concentrations of Chlorpyrifos and Chlorpyrifosoxon Resulting From Chlorpyrifos Use on Grapes, Corn/Soybean, and Sugar beets

Crop Scenario

 1-in-10 

Year 

Peak

 1-in-10 

Year 

Annual 

Average

30 Year 

Average

 1-in-10 

Year 

Peak

 1-in-10 

Year 

Annual 

Average

30 Year 

Average

Grapes LR 112.20 14.74 9.83 107.05 14.06 9.38

Corn/Soybean 30.90 4.61 3.12 29.49 4.39 2.98

Sugar beets 10.55 1.12 0.69 10.06 1.07 0.65

Chlorpyrifos (ppb) Chlorpyrifos-oxon (ppb)

There are two modeled chlorpyrifos use scenarios that result in EDWCs that are substantially

higher than the majority of the modeled chlorpyrifos use scenarios. These use scenarios are for 

grape and turf. The EDWCs reported for Grape HR (high rate; 33 lbs a.i./acre) are the result of a 

high application rate trunk drench/soil application which is currently permitted on labels and 

may not represent actual or intended use of chlorpyrifos on grape. Some labels restrict the use of 

chlorpyrifos on grape to 6 lbs a.i./a. The EDWCs reported for Turf FA (frequent applications) is 

based on 26 applications (limit of PRZM-EXAMS) and a 3 day application interval. This 

scenario was developed to highlight the uncertainty associated with the unrestricted (turf labels 

do not currently restrict the number of chlorpyrifos applications per year) use of chlorpyrifos on 

turf and may not represent actual or intended use. If more than 26 applications per year are made, 

or if the application interval is less than 3 days, the EDWCs reported in this DWA may 

underestimate the exposures resulting from chlorpyrifos use on turf. Further analysis of these two

uses is provided in the Analysis section of this preliminary DWA.

BEAD provided typical use information to help refine this preliminary assessment.7In general, 

preliminary analysis suggests that typical average single application rates correlate well with the 

modeled single application rates; however, in general the number of applications typically 

applied each year is less than the maximum allowed on current labels. Typical agronomic 

practices also vary from those modeled. In general, the farming methods used over the last five 

years result in EDWCs that are lower than the scenarios modeled. Further analysis of typical 

chlorpyrifos use rates and agronomic practices will be incorporated into the final assessment,

including the analysis of the typical upper bound single application rates as compared to the 

average typical single application rates used in this assessment. 

Water monitoring data from the USGS National Water-Quality Assessment Program (NAWQA), 

USEPA/USGS Pilot Reservoir Monitoring Program, USDA Pesticide Data Program (PDP), 

California Department of Pesticide Regulation (CDPR), and National Center for Water Quality 

Research (NCWQR) at Heidelberg College were evaluated in reference to an acute exposure 

concern to chlorpyrifos and its degradation product chlorpyrifos oxon. The monitoring data show 

 

7 Memorandum from Katherine Stebbins (EPA/BEAD) to Rochelle Bohaty (EPA/EFED), Jun. 24, 2011; Typical 

Use Data for Chlorpyrifos (Appendix D).
7

chlorpyrifos detections at low concentrations, generally not exceeding 0.5 μg/L. For example, 

USGS NAWQA, which contains an extensive monitoring dataset for chlorpyrifos and 

chlorpyrifos oxon, reports a peak chlorpyrifos detection of 0.57 μg/L in surface water with a 

detection frequency of approximately 15% (Table 2). CDPR and NCWQR have detected 

chlorpyrifos concentrations greater than 1 ppb in surface water on several occasions. Peak 

concentrations of chlorpyrifos observed for CDPR and NCWQR are 3.96 and 24 μg/L, 

respectively. The detection frequencies of chlorpyrifos in these two programs are 25% for CDPR 

and 8% for NCWQR, as detailed in Table 2. Note, the data from NCWQR have not yet been 

thoroughly reviewed by EPA, but are presented here as supplemental information. In addition, 

the NCWQR data currently available to EFED are pre-2000, when the Agency required 

significant mitigation in its Reregistration Eligibility Decision. Therefore, it is unclear if 

NCWQR monitoring data represent current chlorpyrifos use. EFED is in the process of acquiring 

more recent data from NCWQR and conducting a more thorough review of the NCWQR data. 

Further discussion of the monitoring data and its associated deficiencies are included in the 

Analysis sections of this document and the data are provided in Appendix C.

Table 2. Summary of Water Monitoring Data for Chlorpyrifos and Chlorpyrifos-oxon

Parameter

Surface Water Groundwater

Chlorpyrifos Chlorpyrifosoxon

Chlorpyrifos Chlorpyrifosoxon

USGS NAWQA

Sampling 

Years

1991-2010 1999-2010 1992-2010 2005-2010

Qualified 

Detections

4132 19 44 3

Frequency of 

Detections

14.75% 0.33% 0.42% <1%

Maximum 

Detection

0.57 μg/L

2003

Las Vegas, NV (urban)

0.0543 μg/L

2008

Washington, MS 

(cropland)

0.0707 μg/L

2002

Miller, MS (cropland)

0.0553 μg/L

2009

Colbert, TN 

(agriculture)

NCWQR at Heidelberg College

Source Sandusky River Maumee River

Sampling 

Years 1983-1999 1983-1999

Number of 

Samples 1595 1435

Qualified 

Detections 147 100

Frequency of 

Detections 9.2% 7%

Maximum 

Detection

10.9 μg/L

1992

24.0 μg/L

1992

CDPR

Sampling 

Years 1991-2005

Qualified 1857
8

Parameter

Surface Water Groundwater

Chlorpyrifos Chlorpyrifosoxon

Chlorpyrifos Chlorpyrifosoxon

Detections

Frequency of 

Detections 25.1%

Maximum 

Detection

3.96 μg/L

2003

Monterey County, CA

Quail Creek (ID # 7929)

The reported concentrations from monitoring data are lower than estimated concentrations 

derived from modeling. This result is attributed to the fact that water monitoring sampling 

programs do not specifically target chlorpyrifos use areas, may not represent high chlorpyrifos 

use areas and may not corresponding with applications of chlorpyrifos; therefore, peak 

concentrations of chlorpyrifos and chlorpyrifos-oxon may not be detected. For most monitoring 

locations, sampling frequencies are not designed to capture peak concentrations. Model 

generated times series data suggest that monitoring programs need to sample daily in order to 

capture peak concentrations of chlorpyrifos in surface water. There are also limited sampling 

data available for some areas in the United States and very limited data following drinking water 

treatment. EFED is unaware of any monitoring data for chlorpyrifos or chlorpyrifos-oxon at the 

point of consumption (i.e., consumer tap water). Because currently available monitoring data 

likely underestimate chlorpyrifos and chlorpyrifos-oxon concentrations, monitoring results are

not an appropriate prediction of the potential exposure resulting from chlorpyrifos use. For these 

reasons, EFED does not recommend that chlorpyrifos or chlorpyrifos-oxon water monitoring 

data be used by HED in the human health risk assessment. 

In summary, modeling data indicate that a wide range of chlorpyrifos uses can lead to high levels 

of chlorpyrifos in surface water that could be used by community water systems to supply 

drinking water. In hopes of refining the EDWCs presented in this assessment, several sources of 

water monitoring data were evaluated. At this time, these data are not considered appropriate for 

quantitative use in risk assessment because the monitoring programs were not designed to 

specifically target chlorpyrifos use, sample frequencies were inadequate to detect peak 

concentrations, the sample sites were limited or, as in the case of the NCWQR, the data have not 

been rigorously reviewed. Once chlorpyrifos reaches a drinking water treatment facility, several 

sources of empirical data suggest that chlorpyrifos readily converts to chlorpyrifos-oxon upon 

chlorination. The removal efficiency (filtration, sedimentation, etc.) of chlorpyrifos prior to 

chlorination or chlorpyrifos-oxon following chlorination is unknown. Since 1) chlorination is the 

primary disinfection process used in the United States, 2) data indicate conversion of 

chlorpyrifos to chlorpyrifos-oxon, and 3) the physical removal efficiency of either compound is

unknown, it is assumed that high levels of chlorpyrifos-oxon could end up in drinking water. 

Additional information, as described above, would help to refine the exposure estimates.
9

PROBLEM FORMULATION

Chlorpyrifos (O,O-diethyl o-(3,5,6-trichloro-2-pyridyl phosphorothioate; CAS 2921-88-2) is a 

broad spectrum organophosphate insecticide that inhibits acetyl cholinesterase activity. The 

chemical structure of chlorpyrifos is provided in Figure 1. Chemical identification and physical 

chemical properties of chlorpyrifos are provided in Table 3.

O

P

O N

Cl Cl

Cl

S

O

Figure 1. Chemical Structure of Chlorpyrifos

Table 3. Chemical Identification Information for Chlorpyrifos

Chemical Name O,O-diethyl o-(3,5,6-trichloro-2-pyridyl phosphorothioate

Chemical Abstracts Service (CAS) 

Registry Number 2921-88-2

Empirical Formula C20H17F5N2O2

USEPA Pesticide Code (PC #) 059101

Smiles Notation S=P(OC1=NC(=C(C=C1Cl)Cl)Cl)(OCC)OCC

Molecular Mass 350.57 g/mol

Vapor Pressure (25 °C) 1.87x10-5 torr

Water Solubility

(20 °C)

1.4 mg/L

Henry’s Law Constant 6.2 x 10-6 atm - m

3

/mol

Log Kow 4.7

Use Characterization

Chlorpyrifos is registered for use on a variety of terrestrial food and feed crops, terrestrial nonfood crops, and greenhouse food/non-food crops. Chlorpyrifos is applied in liquid, granular, or 

encapsulated form using aerial and ground application methods including broadcast, soil 

incorporation and chemigation. Registered labels require 25 feet (ground boom and 

chemigation), 50 feet (orchard airblast), or 150 feet (aerial) buffer zones. Based on usage data 

provided by the Biological and Economic Analysis Division (BEAD), more than 8 million 

pounds of chlorpyrifos are used each year for agricultural purposes in the United States.1

Approximately 37% and 14% of the total volume of chlorpyrifos used in the United States each 

year is applied to corn and soybean, respectively. Other crops treated with large amounts of 

chlorpyrifos include alfalfa, almonds, apples, citrus, grapes, peanuts, pecans, sugar beets, sweet 

potatoes, tobacco, walnuts and wheat. At least 100,000 pounds of chlorpyrifos are applied to

each of these crops per year. A large fraction, at least 40%, of the total acreage planted with 

apples, broccoli, citrus, peaches, pecans, sweet corn and walnuts are treated with chlorpyrifos. 

Chlorpyrifos can also be used to treat wood such as fence posts, utility poles and railroad ties. 

Chlorpyrifos is also used on turf. No usage data are available for either of these two use patterns. 
10

The geographic extent of chlorpyrifos use is widespread. The spatial distribution of the 2006-

2008 agricultural usage data is presented in Figure 2.

8

This map reveals intensive agricultural 

use of chlorpyrifos in parts of California, Georgia, Indiana, Iowa, North Dakota and 

Pennsylvania. Other states with high chlorpyrifos use include Florida, Illinois, Michigan, New 

York, Minnesota, Ohio, Washington, and Wisconsin. Use of chlorpyrifos is restricted in 

Mississippi and California, as well as other states or geographical regions depending on the use. 

Figure 2. 2006-2008 Chlorpyrifos Use Spatial Distribution; BEAD agricultural chemical use 

data for chlorpyrifos9

Application rates vary significantly depending on the crop use. The highest number of 

applications listed on an agriculture label containing chlorpyrifos is eight at a rate of 1.5 lb a.i./a 

per acre for cherries (Reg. No. 062719-00221 and 062719-00301).2The highest single 

application rate of chlorpyrifos is one application at up to 33.3 lb a.i./a (7.5 x 10-4lbs a.i./ft2) for 

soil treatment on grapes (Reg. No. 062719-00591, 019713-00520, 019713-00599, 062719-00301 

and 062719-00220). The second highest single application rate is 6 lb a.i./a on citrus (Reg. No. 

062719-00301, 062719-00220, 062719-00221 and 019713-00599). Multiple types of 

applications are permitted on citrus including soil and foliar applications. For example, labels 

permit two foliar applications (7.5 lb) and three soil applications (orchard floors; 3 lbs) per acre 

per year. The minimum application interval specified between chlorpyrifos applications range 

from 7 to 30 days; however, some labels do not provide a minimum retreatment interval. Some

labels permit chlorpyrifos applications to turf on an ―as needed‖ basis. Currently approved 

chlorpyrifos application rates and methods are shown in Table 4.

 

8 Memorandum from Arthur Grube (EPA/BEAD) to Nelson Thurman (EPA/EFED), Feb. 23, 2011; GfK Kynetec. 

Argotrack Pesticide Database 2006-2008.

9 GIS map generated by Nelson Thurman (EPA/EFED)
11

Table 4. Examples of Currently Registered Chlorpyrifos Uses

Crop/Site Application Type/ 

Method

Single 

Application Rate 

Range 

(lb a.i./A)

Maximum 

Application Rate 

Per Yearb

(lb a.i./A)

Maximum 

Application 

Number

Minimum 

Retreatment 

Interval (days)

Comments

Alfalfa

Aerial or ground/ 

broadcast, infurrow, granule 

and chemigation

0.25-1.0 4.0 4 10

Several labels do not restrict the 

use of multiple products that 

contain chlorpyrifos only the 

amount of the specified 

formulation.

Almond

Aerial or ground/ 

broadcast, drench, 

granule and

chemigation

0.25-1.0

Dormant/Delayed 

Dormant

2.0

Foliar 

3/100 gal water

Trunk Spray or 

Pre-plant Dip

2.0-4.0

Orchard Floors

1.0* 

Dormant/Delayed 

Dormant

4.0*

Foliar 

3/100 gal water

Trunk Spray or 

Pre-plant Dip

4.0*

Orchard Floors

Total: cannot be 

determined 

1 

Dormant/Delayed 

Dormant

3

Foliar 

1

Trunk Spray or 

Pre-plant Dip

2

Orchard Floors

Total: 7

10

Dormant/Delayed Dormant: 

Restricted use in California.

Orchard Floors: Restricted use in 

California.

Several labels only specify 

dilution factors and do not 

provide application rates for uses 

including trunk drenches.

Asparagus

Aerial or ground/ 

broadcast, granule

and chemigation

0.9-3.0

(3.0 is granular 

formulation)

3.0 2 10

Several labels do not specify 

seasonal or yearly maximum 

application rates. 

Apple

Aerial or ground/ 

broadcast or 

drench

0.25-2.0

Dormant/Delayed 

Dormant

1.5 lb ai/100 gal

Trunk Spray or 

Pre-plant Dip 

4.0

Dormant/Delayed 

Dormant

1.5 lb ai/100 gal

Trunk Spray or 

Pre-plant Dip

Total: cannot be 

determined

2

Dormant/Delayed 

Dormant

1

Trunk Spray or 

Pre-plant Dip 

Total: 2

10

Tree Trunk: Use permitted in 

states east of the Rockies (except 

Mississippi). Applications rates 

are given as a dilution factor.

Cherries Ground/broadcast 1.0-4.0 12.0 8 10 Some labels do not provide 
12

Crop/Site Application Type/ 

Method

Single 

Application Rate 

Range 

(lb a.i./A)

Maximum 

Application Rate 

Per Yearb

(lb a.i./A)

Maximum 

Application 

Number

Minimum 

Retreatment 

Interval (days)

Comments

and drench Foliar

1.5-3.0/100 gal

Trunk Spray 

Foliar

9.0

Trunk Spray

Total: 21.0

Foliar

3

Trunk Spray 

Total: 11

Foliar

ns

Trunk Spray

application rates for uses 

including trunk drenches; labels 

only specify dilution factors.

Trunk Spray: There is no 

application retreatment interval 

specified on the labels. 

Citrus 

Aerial or ground/ 

broadcast, granule 

and chemigation

1.0-6.0

Foliar 

0.75-1.0

Orchard Floor

7.5

Foliar

3.0 

Orchard Floor

Total: 10.5

2

Foliar

3

Orchard Floor

Total: cannot be 

determined

30 (10 days for 

low application 

rates)

Foliar

10

Orchard Floor

Registered labels permit both 

foliar and soil applications in the 

same orchard. 

Orchard Floor: Some labels do 

not have application restrictions 

rate restrictions. Also some 

labels do not specifically limit 

the retreatment interval.

Labels also do not restrict 

multiple application types such

as foliar and orchard floors.

Cole Crop 

(Brassica) 

Leafy 

Vegetables and 

Radish;

Rutabaga and 

Turnip 

Aerial or ground/ 

broadcast 0.92–2.582 6.0* 3* 10

The labels permit both soil and 

foliar applications in one 

growing season.

Corn

Aerial or ground/ 

broadcast, granule, 

seed and 

chemigation

0.74-1.6 3.0 3 10
13

Crop/Site Application Type/ 

Method

Single 

Application Rate 

Range 

(lb a.i./A)

Maximum 

Application Rate 

Per Yearb

(lb a.i./A)

Maximum 

Application 

Number

Minimum 

Retreatment 

Interval (days)

Comments

Cotton

Aerial or ground/ 

broadcast and 

chemigation

0.5-1.0 3.0 3 10

Cranberry

Aerial or ground/ 

broadcast and 

chemigation 

1.408-1.5 3.0* 2* 10

Figs Ground/ broadcast 1.8775-2.0 2.0 1 ns

Use is restricted to only 

California.

Incorporation to 3 inches is 

suggested but not required

following application.

Filberts Aerial or ground/ 

broadcast

1.0-4.0

Foliar 

4.0

Foliar 

3

Foliar 10 For some labels the retreatment interval is not specified.

Grapes

Ground/broadcast, 

basal spray and 

drench

1.0-33.3 33.3 3 ns

Several labels do not specify 

seasonal or yearly maximum 

application rates.

Registered labels only provide a 

dilution factor and not an 

application rate in lbs ai/a for the 

soil application. The high 

application rate is permitted on 

the 11-15ft2 (3.75-4.4 ft circle) at 

the base of the vine (trunk).

Vineyard density is generally 

reported to be 500-1300 vines 

per acre; however, a method 

known as high density planting 

may result in a vine density near 

3000 vines per acre. For 
14

Crop/Site Application Type/ 

Method

Single 

Application Rate 

Range 

(lb a.i./A)

Maximum 

Application Rate 

Per Yearb

(lb a.i./A)

Maximum 

Application 

Number

Minimum 

Retreatment 

Interval (days)

Comments

example, if vines are spaced 4 

feet by 4 feet approximately 

2756 vines can be planted per 

acre. 

California specific label permits 

three applications at 1 lb a.i./a. 

Other locations restricted to one 

application.

Legume 

Vegetables

Ground/ broadcast, 

seed (incorporation 

suggested)

1.0 1.0 1* na

Mint Ground/broadcast 

and chemigation 1.0-2.0 6.0* 3* ns

Labels allow one pre-plant 

application, one application 

during the growing season and 

one post-harvest application per 

season.

Nectarine

Aerial or ground/ 

broadcast or 

drench

0.25-2.0

(Dormant/Delayed 

Dormant)

2.9

Foliar

3/100 gal water

Trunk Spray or 

Pre-plant Dip

2.0* 

(Dormant/Delayed 

Dormant)

3/100 gal water

5.8

Foliar

Trunk Spray or 

Pre-plant Dip

Total: 2

1

Dormant/Delayed 

Dormant

2

Foliar

1

Trunk Spray or 

Pre-plant Dip

Total: 1

10

Dormant/Delayed Dormant: 

Restricted use in California. 

Foliar: Some of the currently 

registered labels only provide a 

dilution factor and not an 

application rate in lb a.i./a

Trunk Spray or Preplant Dip: 

There is no application 

retreatment interval specified on 

the label. The application rate is 

also provided as a dilution factor.

Newer labels limit the amount of 
15

Crop/Site Application Type/ 

Method

Single 

Application Rate 

Range 

(lb a.i./A)

Maximum 

Application Rate 

Per Yearb

(lb a.i./A)

Maximum 

Application 

Number

Minimum 

Retreatment 

Interval (days)

Comments

chlorpyrifos that can be applied 

per year; however, not all labels 

appear to be updated.

Newer labels limit the amount of 

chlorpyrifos that can be applied 

per year; however, all labels do 

not appear to have been updated. 

Therefore, it is possible that 

multiple types of applications 

can occur such as soil, foliar 

and/or post-harvest and 

dormant/delayed dormant 

applications.

Onion Bulbs Ground/drench or 

directed spray

1.0

Pre-plant

1.0

Post-plant

2.0 2 ns

Peach

Aerial or ground/ 

broadcast or 

drench

0.25-2.0

(Dormant/Delayed 

Dormant)

2.9

Foliar

2.8-3/100 gal 

water

Trunk Spray or 

Pre-plant Dip

2.0* 

Dormant/Delayed 

Dormant

5.8

Foliar

3/100 gal water

Trunk Spray or 

Preplant Dip

Total : 2.0

2*

Dormant/Delayed 

Dormant

2

Foliar

1

Trunk Spray or 

Preplant Dip

Total: 1

10

Dormant/Delayed Dormant: 

Restricted use in California. 

Foliar: Some of the currently 

registered labels only provide a 

dilution factor and not an 

application rate in lb a.i./a

Trunk Spray or Preplant Dip: 

There is no application 

retreatment interval specified on 

some of the labels. 

Newer labels limit the amount of 
16

Crop/Site Application Type/ 

Method

Single 

Application Rate 

Range 

(lb a.i./A)

Maximum 

Application Rate 

Per Yearb

(lb a.i./A)

Maximum 

Application 

Number

Minimum 

Retreatment 

Interval (days)

Comments

chlorpyrifos that can be applied 

per year; however, all labels do 

not appear to have been updated. 

Therefore, it is possible that 

multiple types of applications 

can occur such as soil, foliar 

and/or post-harvest and 

dormant/delayed dormant 

applications.

Peanut Aerial or ground/ 

broadcast 1.0-2.0 4.0* 2 10

No more than one pre-plant 

application is permitted per 

season. Pre-plant applications are 

incorporated 3 to 4 inches.

Pear Aerial or ground/ 

broadcast

0.25-2

Dormant/Delayed 

Dormant

2.0

Post-harvest

2.0* 

Dormant/Delayed 

Dormant

2.0

Post-harvest

Total: 4.0

1

Dormant/Delayed 

Dormant

1

Post-harvest

Total: 2.0

10

Dormant/Delayed Dormant: 

Restricted use in California. 

Some labels only permit use in 

California, Oregon and 

Washington. 

Newer labels limit the amount of 

chlorpyrifos that can be applied 

per year; however, all labels do 

not appear to have been updated. 

Therefore, it is possible that 

multiple types of applications 

can occur in one year such as a 

post-harvest application and a 

dormant/delayed dormant 

application.

Pecans Aerial or ground/ 1.0-2.0 6.0 3 10 Labels also do not restrict 
17

Crop/Site Application Type/ 

Method

Single 

Application Rate 

Range 

(lb a.i./A)

Maximum 

Application Rate 

Per Yearb

(lb a.i./A)

Maximum 

Application 

Number

Minimum 

Retreatment 

Interval (days)

Comments

broadcast and 

chemigation 

Foliar

2.0-4.0

Orchard Floor

Foliar

4.0

Orchard Floor 

Total: 10

Foliar

2

Orchard Floor 

Total: 5

multiple application types such 

as foliar and orchard floors.

Plum or Plums Aerial or ground/ 

broadcast

0.25-2.0

Dormant/Delayed 

Dormant

2.0*

Dormant/Delayed 

Dormant

1

Dormant/Delayed 

Dormant

ns

Dormant/Delayed Dormant: 

Restricted use in California. 

Golf Course 

Turf and 

Industrial 

Areas 

Ground/broadcast 

and drench 0.25-1.0 ns ns as

The labels do not provide 

restrictions on the maximum 

number of applications per year 

or the minimum retreatment 

interval.

Ornamentals

Ground/broadcast, 

basal spray and 

drench

0.92-4.0 ns ns 7

Several labels only specify 

dilution factors (e.g. 8/100 gal) 

and do not provide application 

rates in lb a.i./a for uses 

including trunk drenches, stump 

treatment and sprays. 

Several labels do not specify 

seasonal or yearly maximum 

application rates. Most labels do 

not specify a minimum 

retreatment interval.

Christmas 

Trees

Ground/broadcast 

and drench

3/100 gal water

Cut Tree Dip

1.0

Foliar

3 3 7

The application rate for the cut 

tree dip is provided as a dilution 

factor so the amount a.i./a cannot 

be determine for a single or 

yearly application rate.

Sorghum Aerial or ground/ 

broadcast and 0.25-1.0 1.5* 3* 10 There is restricted use on sweet varieties of sorghum. 
18

Crop/Site Application Type/ 

Method

Single 

Application Rate 

Range 

(lb a.i./A)

Maximum 

Application Rate 

Per Yearb

(lb a.i./A)

Maximum 

Application 

Number

Minimum 

Retreatment 

Interval (days)

Comments

chemigation

Soybean

Aerial or ground/ 

broadcast and 

chemigation

0.25-1.0

Foliar

0.5-1.0

Soil

3.0* 3 10 Some labels do not specify the 

application interval.

Strawberries Aerial or ground/ 

broadcast

2.0 

Pre-plant

1.0

Foliar

1.0

Post-harvest

2.0 

Preplant

2.0

Foliar

Post-harvest

Total: 4.0

1

Preplant

2

Foliar

and Post-harvest 

(combined)

Total: 3

10

Some of the labels are written as 

a pre-bloom (only); however, 

application types listed within 

the subsection include pre-pant, 

foliar and post-harvest. 

The label suggests that pre-plant 

applications be incorporated;

however, an incorporation depth 

is not provided.

Sugar Beets Aerial or ground/ 

broadcast 

0.5

Pre-plant

0.25-1.0

Post Plant

3.0* 3* 10 Preplant application includes 

incorporation (1-2 inches).

Sunflowers

Aerial or ground/ 

broadcast and soil 

incorporation

1.0-2.0 

Pre-plant 

0.5-1.5 

Post-emergence

2.0

Pre-plant

3.0

Post-emergence

Total: 3.0

1

Pre-plant

2

Post-emergence

Total: 3

7

Pre-plant application includes 

incorporation (2-4 inches). 

There is inconsistent language on 

some of the labels on the 

minimum retreatment interval. 

For example, 66222-19 (pg. 14) 

the text states ―a second 

treatment may be made 7 to 10 

days later if needed. Do not 

make a second application within 

10 days of the first application.‖ 

Sweet Potatoes Aerial or ground/ 2.0 2.0 1
19

Crop/Site Application Type/ 

Method

Single 

Application Rate 

Range 

(lb a.i./A)

Maximum 

Application Rate 

Per Yearb

(lb a.i./A)

Maximum 

Application 

Number

Minimum 

Retreatment 

Interval (days)

Comments

broadcast

Tobacco Aerial or Ground/ 

broadcast 1.0 2.0* 1* The label specifies 2 inch incorporation after application.

Turf Grass 

(sod)

Aerial or ground/ 

broadcast 0.92-4.0 ns ns ns

Labels do not provide 

restrictions on the maximum 

number of applications per year 

or the minimum retreatment 

interval. 

Outside 

Surfaces (e.g 

building 

perimeter).

Ground/broadcast 1 ns ns ns

Applications can be to a height 

on 2-3 feet on structures and 

from 6 to 10 feet wide.

No retreatment information is 

provided on the label.

Walnut Aerial or ground/ 

broadcast

2.0

Dorman/Delayed 

Dormant

1.0-4.0

Orchard Floor

2.0

Foliar

2.0*

Dorman/Delayed 

Dormant

4.0*

Orchard Floor

4.0*

Foliar

Total: 10.0

2*

Dorman/Delayed 

Dormant

2*

Orchard Floor

2*

Foliar

Total: 6

10

Labels permit multiple types of 

applications in one walnut 

orchard.

Wheat

Aerial or ground/ 

broadcast and 

chemigation

0.25-0.5 1.0* 2*

* seasonal application restrictions
20

Previous Drinking Water Assessments

Several drinking water assessments (DWAs) have been completed for chlorpyrifos. Previous 

assessments relied upon Tier I groundwater and Tier II surface water modeling. As part of the 

2002 Interim Reregistration Eligibility Decision which eventually became the Reregistration 

Eligibility Decision (RED), a drinking water exposure assessment was completed. This exposure 

assessment included a review of surface and groundwater monitoring data as well as model 

estimations for both chlorpyrifos and a known environmental degradation product, 3,5,6-

trichloro-2-pyridinol (TCP). No monitoring data or model estimations were considered for 

chlorpyrifos-oxon in this exposure assessment. Since the RED, several drinking water 

assessments have been completed for proposed new uses of chlorpyrifos (DP 336295, 344311, 

344526 and 357900). These assessments took into account chlorpyrifos, TCP and chlorpyrifosoxon. Recent DWAs have only taken into account chlorpyrifos and chlorpyrifos-oxon (e.g. DP 

381378). The focus on particular degradates of concern has changed over time in response to 

additional toxicology and exposure information. 

In previous DWAs, estimated drinking water concentrations (EDWCs) for surface water have 

provided the highest exposure values, with the exception of groundwater monitoring data for 

wells that had been contaminated by use of chlorpyrifos as a termiticide. This use has since been 

cancelled. EDWCs for surface water reported in the RED and remodeled in a 2007 DWA (DP 

336295) are summarized in Table 5.

Table 5. Previously Reported Estimated Drinking Water Concentration of Chlorpyrifos 

Crop Scenario 1-in-10 Year 

Peak

 1-in-10 Year 

Annual Average 30 Year Average

Tobacco1

77.91 18.96 14.26

Tobacco 36.73 6.89 4.72

Chlorpyrifos (ppb)

RED Drinking Water Assessment

2007 Reevaluation of RED Modeling (updated tobacco label)

1. RED values were previously reported for the farm pond (30.6 μg/L 1-in-10

Year Peak). The values reported here have been adjusted for the index reservoir. 

Environmental Fate Assessment

The environmental fate database for chlorpyrifos is largely complete. Abiotic hydrolysis is not 

expected to play a significant role in chlorpyrifos dissipation; however, under alkaline conditions

(pH 9), laboratory studies show chlorpyrifos is susceptible to hydrolysis with a half-life of 

approximately two weeks. Laboratory studies suggest that volatilization and photogradation are 

not likely to play a significant role in the dissipation of chlorpyrifos in the environment. 

Nonetheless, chlorpyrifos has been detected in air samples, so volatilization may play more of a 

role in dissipation than laboratory studies indicate. The major route of dissipation of chlorpyrifos 

appears to be aerobic and anaerobic metabolism. Based on available data, chlorpyrifos degrades 
21

slowly in soil under both aerobic and anaerobic conditions. Degradation begins with cleavage of 

the phosphorus ester bond to yield 3,5,6-trichloro-2-pyridinol (TCP) as shown in Figure 3. TCP 

is also a degradation product of triclopyr (PC 116002). Aerobic and anaerobic soil metabolism 

studies also suggest TCP can be converted to 3,5,6-trichloro-2-methoxypyridine (TMP) as shown 

in Figure 3. TMP was not observed at concentrations greater than 10% and is not further 

discussed in this assessment. The half-life in aerobic aquatic conditions is approximately one

month while anaerobic aquatic metabolism half-lives range from 39 to 51 days. The aquatic 

metabolism data suggest that chlorpyrifos partitions to soil/sediment while its degradation 

products are more likely to partition to water. Laboratory adsorption/desorption studies indicate 

leaching of chlorpyrifos is not likely. Chlorpyrifos was not detected at soil depths greater than 

six inches in field dissipation studies, further supporting that chlorpyrifos is not likely to leach 

through the soil. Yet, under certain use scenarios chlorpyrifos has been detected in 

groundwater.

10 Field dissipation studies show that chlorpyrifos is moderately persistent with a 

half-life of less than 60 days. Chlorpyrifos is slightly soluble in water but once it reaches aquatic 

environments the Log Kow indicates that chlorpyrifos may bioaccumulate in fish and other 

aquatic organisms. A fish bioaccumulation study shows that chlorpyrifos is absorbed by fish; 

however, it rapidly depurates when exposure ceases. Environmental fate properties of 

chlorpyrifos are summarized in Table 6. It is unclear how formulation impacts the dissipation of 

chlorpyrifos in the environment. Specifically, it is unknown if the granular or encapsulated 

formulations slow the dissipation of chlorpyrifos in the environment. 

O

P O N

Cl Cl

Cl

S

O

O

P O N

Cl Cl

Cl

O

O

HO N

Cl Cl

Cl

Chlorpyrifos Chlorpyrifos-oxon

3,5,6-trichloro-2-pyridinol (TCP)

H3CO N

Cl Cl

Cl

3,5,6-trichloro-2-methoxypyridine (TMP)

Figure 3. Environmental Transformation of Chlorpyrifos 

Table 6. Environmental Fate and Transport Characteristics of Chlorpyrifos

Parameter Data Study ID Study Status

Hydrolysis Half-life 

(t1/2)

pH 5: 73 days

pH 7: 72 days

pH 9: 16 days

MRID 00155577

Acc. 260794 Acceptable

pH 7: 81 days MRID 40840901 Acceptable

Aquatic Photolysis 

Half-life (t1/2)

29.6 days @ pH 7 MRID 41747206 Acceptable

Soil Photolysis Stable MRID 42495403 Supplemental

 

10 These detections are associated with termiticide uses which have been cancelled.
22

Parameter Data Study ID Study Status

Half-life (t1/2) 180 days MRID 42144911 Acceptable

Aerobic Soil 

Metabolism

Half-life (t1/2)

107, 11, 22, 102, 24, 34 and 141 

days

Acc. 241547

MRID 42144911 Acceptable

Aerobic Aquatic 

Metabolism Half-life 

(t1/2)

30.5 days MRID 44083401 Scientifically Valid1

Anaerobic Soil 

Metabolism half-life 

(t1/2)

15 and 58 days MRID 00025619 Acceptable

Anaerobic Aquatic 

Metabolism half-life 

(t1/2)

39 and 51 days MRID 00025619 Supplemental2

Adsorption 

Coefficient (Kd)

49.9, 65.6 and 99.7 Acc. 260794 Acceptable

Soil Partition 

Coefficient (Koc)

7300, 5860 and 4960 mL/g Acc. 260794 Acceptable

Terrestrial Field 

Dissipation

33 to 56 days

1.3-4, 7.3-<27 and 1.4-<32 days

6.5-11.4 days and secondary phase 

(days 28-120) half-lives of 24-38.3 

days

MRID 4005900 Acceptable

1. Previous risk assessments and the problem formulation developed for Registration Review indicate that no 

aerobic aquatic metabolism data are available; however, one study (MRID 44083401) was located during the 

review process. No data evaluation record or classification for this study was found. Preliminary evaluation 

indicates that although there are several study deviations, this study is scientifically valid. The study is

undergoing a thorough review. The value listed in the table is the value reported by the author in the study 

report. 

2. Previous risk assessments and the problem formulation developed for Registration Review indicate that no 

anaerobic aquatic metabolism data are available. During the review process one study (MRID 00025619)

was located. This study was originally classified as acceptable for anaerobic aquatic metabolism. At this 

time, this study is being reclassified as supplemental as there are several study deficiencies; however, the 

study provides useful information.

Environmental fate studies submitted to EPA supporting the registration of chlorpyrifos do not 

identify chlorpyrifos-oxon as a transformation product. It is unclear if the analytical methods 

used in these studies were adequate for identification; however, chlorpyrifos-oxon was not used 

as a reference standard in these experiments. Organophosphates that contain a phosphothionate 

group (P=S) such as chlorpyrifos are known to transform to the corresponding oxon analogue 

which contains a phosphorus-oxygen double bond (P=O) instead. 3,11,12 This transformation 

occurs via oxidative desulfonation. Oxidation of chlorpyrifos to chlorpyrifos-oxon is shown in 

Figure 3. EPI Suite (v.4.00) was used to estimate the physical/chemical properties of 

chlorpyrifos-oxon as shown in Table 7. Oxidation of organophosphates has been shown to occur 

through photolysis, aerobic metabolism and chlorination as well as other oxidative processes. For 

 

11 Wu, J.; Laird, D. A. Abiotic Transformation of Chlorpyrifos to Chlorpyrifos Oxon in Chlorinated Water. 

Environ. Toxcol.Chem., 2003, 22(2), 261-264.

12 Tierney, D. P.; Christensen, B. R.; Culpepper, V. C. Chlorine Degradation of Six Organophosphate Insecticides 

and Four Oxons in Drinking Water Matrix. Submitted by Syngenta Crop Protection, Inc. 2001.
23

chlorpyrifos, water purification (chlorination) has been shown to be a major route of 

chlorpyrifos-oxon formation.3,11,12 This transformation has been shown to proceed via rapid 

oxidation by the oxychlorine species used in water treatment and water treatment simulations 

have shown that chlorpyrifos-oxon is the primary degradation product of chlorpyrifos. This 

transformation is almost quantitative. Once formed, chlorpyrifos-oxon has been shown to be 

relatively stable (t1/2 = 12 days) under typical water purification conditions (pH 8).

13

 

Table 7. Physical/Chemical Properties Chlorpyrifos-oxon

Parameter Chlorpyrifos-oxon Source

Molecular Weight 334.52 /mol ChemDraw Ultra

Water Solubility 26.0 mg/L EPI Suite (v4.00)

Vapor Pressure (25 °C) 6.65x10-6 torr EPI Suite (v4.00)

Henry’s Law Constant 5.5 x 10-9 atm - m

3

/mol estimated

EPI Suite (v4.00)

Log (Kow) 2.89 mg/L estimated

EPI Suite (v4.00)

Chlorpyrifos-oxon has been detected in environmental samples including surface water, 

precipitation and air.14,15,16,17 For example, one study found higher concentrations of 

chlorpyrifos-oxon than chlorpyrifos (ratio of 5.6:3.9) in air samples.17 There are several literature 

studies that underscore the potential for chlorpyrifos-oxon formation. Photodegradation of 

chlorpyrifos to chlorpyrifos-oxon in solution as well as on glass, plant and soil surfaces has been 

observed.18,19 Chlorpyrifos-oxon has been shown to undergo hydrolysis faster than chlorpyrifos. 

The hydrolysis half-life of chlorpyrifos-oxon is substantially shorter than that observed for 

chlorpyrifos.3 Chlorpyrifos-oxon hydrolyses to form TCP, a major environmental degradation 

product reported for chlorpyrifos. A recent memo discusses the possible formation of 

chlorpyrifos-oxon in the environment (DP 380682). Additional studies on chlorpyrifos-oxon 

were requested in EPA’s final work plan for the Registration Review of Chlorpyrifos (September 

 

13 pH 8 and residual chlorine concentration of 1 ppm.

14 Landers, D. H.; Simonich, S. L.; Jaffe, D. A.; Geiser, L. H.; Campbell, D. H.; Schwindt, A. R.; Schreck, C. B.; 

Kent, M. L.; Hafner, W. D.; Taylor, H. E.; Hageman, K. J.; Usenko, S.; Ackerman, L. K.; Schrlau, J. E.; Rose, N. L.; 

Blett, T. F; Erway, M. M.; The fate, transport, and ecological impacts of airborne contaminants in Western National 

Parks (USA) U.S. Environmental Protection Agency Report EPA/600/R-07/138, 2008, 

http://www.epa.gov/nheerl/wacap

15 LeNoir, J. S.; McConnell, L.L; Fellers, G. M; Cahill, T. M; Seiber, J. N. Summertime Transport of Current-use 

pesticides from California’s Central Valley to the Sierra Nevada Mountain Range, USA. Environ. Toxicol. Chem.

1999, 18, 2715-2722.

16 Sparling, D. W.; Fellers, G. M.; McConnell, L. L. Pesticides and amphibian population declines in California, 

Environ. Toxicol. Chem. 2001, 20, 1591-1595.

17 Glotfelty, D. E.; Majewski, M. S.; Selber, J. N. Distribution of Several Organophosphorus Insecticides and Their 

Oxygen Analogues in a Foggy Atmosphere. Environ. Sci. Technol., 1990, 24 (3), 353-357.

18 Kralj , M. B.; Franko, M. Trebse. Photodegradation of Organophosphorus Insecticides – Investigations of 

Products and Their Toxicity Using Gas Chromatography-Mass Spectrometry and AChE-thermal Lens Spectrometric 

Bioassay. Chemosphere, 2007, 67, 99-107. 

19 Walia, S.; Dureja, P.; Mukerjee, S. K. Arch. Environ. Contam. Toxicol. 1988, 17, 183-188.
24

2009). EFED expects to receive aerobic soil metabolism, adsorption/desorption (batch 

equilibrium) and field volatility data for chlorpyrifos-oxon within the next year. Environmental 

fate properties of chlorpyrifos-oxon are shown in Table 8.

Table 8. Environmental Fate Properties of Chlorpyrifos-oxon

Parameter Chlorpyrifos-oxon Source

Hydrolysis 

Half-life (t1/2 ) 

pH=7

13.2 days 

Environ. Sci. 

Technol. 2006, 40, 

546-551

Aqueous Photolysis

Half-life (t1/2 )

< chlorpyrifos

Chemosphere 2007; 

Arch. Environ. 

Contam. Toxicol. 

1998 

Aerobic Soil 

Metabolism Half-life 

(t1/2 )

No data

Aerobic Aquatic 

Metabolism

Half-life (t1/2 )

No data

Anaerobic Soil 

Metabolism (t1/2)

No data

Anaerobic Aquatic 

Metabolism (t1/2)

No data

Soil Adsorption 

Coefficient Koc

No data

Conceptual Model

Chlorpyrifos applications can lead to surface water contamination as a result of spray drift as 

well as through runoff and sediment erosion. The soil/water partitioning of chlorpyrifos indicates 

that chlorpyrifos runoff is generally by soil erosion rather than dissolution in runoff water. 

Based on the fate properties of chlorpyrifos it may be persistent in the environment for several 

weeks to months post-application. Once in aquatic environments, chlorpyrifos is likely to persist 

for at least several months. These data suggest, along with monitoring data, that runoff via 

dissolved phase and eroded sediment, spray drift, and volatilization are probable environmental 

transport mechanisms for chlorpyrifos and chlorpyrifos-oxon. An illustration highlighting 

possible environmental dissipation routes is shown in Figure 4.
25

Figure 4. Routes of Pesticide Dissipation in the Environment

Analysis

Tier I groundwater estimated drinking water concentrations (EDWCs) for chlorpyrifos and 

chlorpyrifos-oxon were calculated using SCI-GROW (Screening Concentration in Groundwater, 

version 2.3, August 8, 2003). SCI-GROW was developed by fitting a linear model to 

groundwater concentrations with the Relative Index of Leaching Potential (RILP) as the 

independent variable. Groundwater concentrations were taken from 90-day average high 

concentrations from Prospective Groundwater studies; the RILP is a function of aerobic soil 

metabolism and the soil-water partition coefficient. The output of SCI-GROW represents the 

concentrations that might be expected in shallow unconfined aquifers under sandy soils, which is 

representative of the groundwater most vulnerable to pesticide contamination likely to serve as a 

drinking water source. 

Tier II surface water EDWCs for chlorpyrifos and chlorpyrifos-oxon resulting from chlorpyrifos 

use on a variety of crops were calculated using PRZM (Pesticide Root Zone Model, version 

3.12.3, June 2006) and EXAMS (EXposure Analysis Modeling System, version 2.98.04.06, 

April 2005) models in the PE5 shell. PRZM is used to simulate pesticide transport as a result of 

runoff and erosion from an agricultural field. EXAMS estimates environmental fate and 

transport of pesticides in surface water. 

All Tier II modeling was corrected for percent cropped area (PCA), an adjustment factor used to 

account for the percentage of a watershed that is planted with a crop or set of crops, recognizing 

that in many cases a watershed that is large enough to support a drinking water facility will not 

usually be planted completely with a single crop or a small set of crops. When applications 

include non-agricultural use such as turf, no adjustment is made, (i.e. the PCA = 1) as the 

Geographic Information System (GIS) coverage used to develop the PCA adjustment factors 

represents only agricultural land.20 Since chlorpyrifos is registered for use on turf (including sod 

 

20 Jones, R. D.; Costello, K.; Hetrick, J.; Lin, J.; Parker, R.; Thurman, N.; Peck, C.; Orrick, G. Development of Use 

od Percent Cropped Area Adjustment Factors in Drinking Water Expsure Assessments. U.S. Environmental 

Protection Agency, Sept. 9, 2010.
26

farms, golf courses, road medians and industrial areas) a percent cropped area (PCA) of 1 

(considers 100% of the watershed is treated) was applied to surface water modeling results for 

national assessment. EFED continues to work on developing additional crop specific PCA 

values, including one for turf. Should the turf PCA become final before the completion of this 

drinking water assessment, the new PCA will be used in the final assessment. If chlorpyrifos was

not registered for use on turf, a PCA value of 0.87 (87% of the watershed treated) would have 

been used based on the other registered uses; reducing the EDWCs by 13%. 

 

Since there are limited environmental fate data available for chlorpyrifos-oxon and chlorpyrifos 

is expected to oxidize to chlorpyrifos-oxon during drinking water treatment, EDWCs for 

chlorpyrifos-oxon were derived from EDWCs calculated for chlorpyrifos. This was done by 

multiplying chlorpyrifos EDWCs by 0.9541 (molecular weight of chlorpyrifos-oxon/molecular 

weight of chlorpyrifos) and 100% (maximum possible conversion of chlorpyrifos to 

chlorpyrifos-oxon in the environment and during water purification). The reported groundwater 

chlorpyrifos-oxon EDWCs are representative of drinking water supplies that utilize oxidative 

treatment methods such as chlorination. In general, drinking water taken from private wells is not 

treated; however, community drinking water supplied by wells may be treated with chlorine in 

order to protect drinking water during distribution. The maximum conversion of chlorpyrifos to 

chlorpyrifos-oxon (100%) under typical drinking water treatment conditions was used for the

following reasons:

Empirical data show chlorpyrifos rapidly oxidizes to form chlorpyrifos-oxon 

quantitatively during drinking water treatment.

3

o The conversion of chlorpyrifos to chlorpyrifos-oxon via oxidation is significantly 

faster than the hydrolysis of chlorpyrifos to TCP at pH 8. 3

Chlorpyrifos-oxon is not expected to degrade to a great extent between drinking water 

purification and consumer consumption (drinking water distribution).

o Water distribution time periods typically range from a few hours to a few days;

this is several days less than the estimated hydrolysis half-life of chlorpyrifosoxon.

 Experimental data indicate that chlorpyrifos-oxon is relatively stable to 

hydrolysis at pH 8 as highlighted in Figure 5.

3

The observed half-life of 

chlorpyrifos-oxon is 12 days at pH 8.3

o Empirical data suggest >80% of chlorpyrifos is present as the oxon at 5 days post 

drinking water treatment and <20% is present as TCP. A comparison of the 

amount of chlorpyrifos, chlorpyrifos-oxon and TCP following drinking water 

treatment is presented as a function of time in Figure 6.

3
27

pH

0 2 4 6 8 10 12 14 16

Half-life (days)

0

2

4

6

8

10

12

14

16

Chlorpyrifos-oxon

Figure 5. Hydrolysis of Chlorpyrifos-oxon as a Function of pH; Results are based on the 

hydrolysis rate constants reported in a drinking water purification simulation experiment.

Days Posttreatment

0 5 10 15 20 25 30 35

Percent 

0

20

40

60

80

100

Chlorpyrifos

Chlorpyrifos-oxon

3,5,6-trichloro-2-pyridinol (TCP)

Figure 6. Comparative Analysis of Chlorpyrifos and Its Transformation Products 

Following Drinking Water Treatment; Results are based on the transformation rate constants 

reported for chlorpyrifos and chlorpyrifos-oxon presented in a bench top drinking water 

treatment simulation experiment (pH 8).3The oxidation rate for chlorpyrifos is significantly 

higher than the rates of hydrolysis; therefore, all chlorpyrifos is expected to be instantaneously 

converted to chlorpyrifos-oxon. The concentration of oxychlorine is assumed to be constant and 

its contribution to reactions other than oxidation of chlorpyrifos to chlorpyrifos-oxon is 

considered negligible based on reported rate constants. 

It is possible that some drinking water treatment procedures such as use of granular activated 

carbon filtration and water softening may reduce the amount of chlorpyrifos-oxon in drinking 

water.4 Based on laboratory data, alkaline pH >10 (water softening) will significantly increase 

the rate of chlorpyrifos-oxon hydrolysis. Water softening is not a method commonly practiced 
28

throughout the country for surface water. Therefore, adjustment of the 100% conversion factor to 

account for degradation under such conditions is not appropriate. No data are available on the 

removal efficiency of chlorpyrifos-oxon during water treatment processes. 

Selecting Input Parameters

The input parameters used in this DWA were selected from the environmental fate data 

submitted by various registrants in accordance with US EPA-OPP Environmental Fate and 

Effects Division’s (EFED) water model parameter guidance.21 Note that uncertainties exist in 

choosing input parameters. For this reason, this assessment incorporates all scientifically 

available data to provide estimates for chlorpyrifos and chlorpyrifos-oxon concentrations

resulting from chlorpyrifos use. Each input value was calculated according to the input parameter 

guidance as detailed below. Data sources as well as the input values used in the model runs for 

SCI-GROW and PRZM-EXAMS are summarized in Table 9.

Water Solubility

The water solubility of chlorpyrifos has been reported to be between 0.5-2.0 mg/L for 

temperatures between 20-25 °C. Based on data submitted to EPA, 1.4 mg/L was used in 

modeling. 

Soil Partition Coefficient

Registrants have provided data necessary to determine that soil binding for chlorpyrifos is 

correlated with organic carbon content (i.e., the coefficient of variation for Koc values is less than 

that for Kd values). The mean Koc value of 6040 for chlorpyrifos was used in PRZM-EXAMS 

modeling while the median Koc value of 5860 was used in SCI-GROW modeling. 

Aerobic Soil Metabolism Half-life

The 90th percentile confidence bound on the mean chlorpyrifos half-life value is 77.6 + [(1.415 x 

63.5)/√8)] = 109 days. This value is used in PRZM-EXAMS modeling. The median half-life 

value of 68 days was used in SCI-GROW modeling.

Anaerobic Soil Metabolism Half-life

The 90th percentile confidence bound on the mean chlorpyrifos half-life value is 36.5 + [3.078 x 

30.4)/√2)] = 103 days. This value is used in PRZM-EXAMS modeling. 

Aerobic Aquatic Metabolism Half-life

Only one half-life value (MRID 44083401) is available so this value (30.5 days) was multiplied 

by three to get 91.5 days. This value is used in PRZM-EXAMS modeling. 

 

21 Guidance for Selecting Input Parameters in Modeling the Environmental Fate and Transport of Pesticides, Version 2.1, October 22, 2009. 
29

Table 9. Input Parameters Used in SCI-GROW and PRZM-EXAMS Modeling to Estimate 

Chlorpyrifos Drinking Water Concentrations.

Parameter Values for Chlorpyrifos/ 

Comments

Source

Vapor Pressure 

(25 °C) 1.87x10-5 torr CRLF assessment, Oct. 16, 2009product chemistry BC 2062713

Water Solubility

(20 °C)

1.4 mg/L MRID 41829006

Molecular Weight 350.57 g/mol product chemistry

Henry’s Law 

Constant 6.2 x 10-6 atm - m

3

/mol calculated

Hydrolysis (t1/2)

81 days

maximum value of

72 and 81 days

MRIDs 00155577 and 40840901

Aqueous 

Photolysis (t1/2)

29.6 days MRID 41747206

Aerobic Soil 

Metabolism (t1/2)

SCI-GROW: 68 days median half-life value.

PRZM-EXAMS: 109 days

upper 90th percentile confidence bound on the 

mean half-life value. 

t1/2 =107, 11, 22, 102, 24, 34, 141 and 180 days

Acc. # 241547 and MRID 

42144911

Aerobic Aquatic 

Metabolism (t1/2)

91.5 days

3x the one half-life value (30.5 days) MRID 44083401

Anaerobic Soil 

Metabolism (t1/2)

103 days

upper 90th percentile confidence bound on the 

mean half-life value of

15 and 58 days

MRID 00025619

Anaerobic Aquatic 

Metabolism (t1/2)

63 days

upper 90th percentile confidence bound on the 

mean half-life value of

39 and 51 days

MRID 00025619

Soil Adsorption 

Coefficient Koc

SCI-GROW: 5860 median Koc value 

PRZM-EXAMS: 6040 mL/g mean Koc value.

Koc values = 7300, 5860 and 4960 mL/g

Acc. # 260794

Spray Drift

3.9% (aerial)

1.9% (air-blast)

1.0% (ground)

0.0% (granular)

AgDRIFT modeling based on 

label restrictions 

Anaerobic Aquatic Metabolism Half-life

The 90th percentile confidence bound on the mean chlorpyrifos half-life value is 45 + [(3.078 x 

8.5)/√2)] = 63 days. This value is used in PRZM-EXAMS modeling. 
30

PRZM-EXAMS Model Scenario

Several specific chlorpyrifos use scenarios were developed and modeled using PRZM-EXAMS

based on currently registered uses of chlorpyrifos as reported on the EFED label data report as 

well as some recently revised labels. This DWA also considers recent revisions to chlorpyrifos 

labels (labels updated since 2/6/2009 as noted) for completeness. Spray drift fractions were 

determined for both aerial and ground applications based on the required buffer zones using 

AgDRIFT. For uses that permit both aerial and ground applications, only aerial applications were 

modeled, as the AgDRIFT results suggest aerial application results in the highest spray drift. 

When more than one standard scenario exists for a given crop group or subgroup, all are 

modeled. The standard scenarios (crop, location and meteorological data) application rate, 

interval and date used in PRZM-EXAMS modeling are shown in Table 10. Due to the ambiguity 

of some of the current labels, several assumptions were made (see list below). Specific rationales 

behind assumptions made to complete modeling are discussed in Table 10, as necessary. A few 

general assumptions are listed below.

Maximum application rates and minimum application retreatment intervals allowed 

on the labels were used for modeling, unless otherwise noted. When typical

application rates scenarios were modeled, if the application number exceeded an 

integer (e.g., 1.3) the number of applications was assumed to be the next highest 

integer (i.e., 2).22

When the label does not recommend an application date or range, meteorological 

data, crop profiles, as well as best professional judgment, were used to establish an 

application date. For some use scenarios, several application dates were evaluated and 

the date that provided the most conservative EDWCs was used.

When more than one standard scenario exists for a given crop, all may have been 

modeled; however, only the scenario providing the most conservative EDWC is 

reported, unless otherwise noted.

If multiple types of applications are allowed on one crop within one year, such as preplant or soil incorporation along with a foliar application(s), all applications were 

assumed to be foliar applications. Additional modeling can be completed to take into 

account the different types of agricultural practices; however, the reported values are 

expected to be conservative. Additional modeling may reduce the EDWCs slightly.

Groundwater

Tier I groundwater EDWCs are not expected to be greater than 1.1 and 1.0 μg/L for chlorpyrifos 

or chlorpyrifos-oxon, respectively.6 All EDWCs for groundwater are shown by chlorpyrifos use 

in Table 11. 

 

22 Typical use rates provided by BEAD email 6/10/2011
31

Table 10. Scenario Specific Input Parameters Used in PRZM-EXAMS Modeling to 

Estimate Chlorpyrifos and Chlorpyrifos-oxon Concentrations Resulting From the 

Registered Uses of Chlorpyrifos

Input Parameter 

(Symbol; Unit) Value Used Reference

Alfalfa

CAM 2

Aerial spray, 

foliar application EFED Guidance 

Application Type and 

Depth of Incorporation 0 Aerial application EFED Guidance

Spray Drift Fraction 0.039 Aerial application AgDRIFT modeling based on registered label 

restrictions

Application Efficiency 0.95 Aerial application EFED Guidance

Number of 

Applications/Application 

Rate2

4/1.1 kg ai/ha Registered Labels, LUIS report 2/6/2009

Interval Between 

Applications

10 days Registered Labels, LUIS report 2/6/2009

Location Specific Crop 

Scenarios and 

Application Date

TX alfalfaOP, w13958

May 15

IDNpotato_WirringSTD, w24156

July 15

Registered Labels, LUIS report 2/6/2009, Crop 

Specific Profiles,1PRZM-EXAM Scenario 

Profiles and Meteorological Data.

Almonds

CAM 2

aerial spray, foliar 

application EFED Guidance 

Application Type and 

Depth of Incorporation 0 Aerial application EFED Guidance

Spray Drift Fraction 0.039 Aerial application AgDRIFT modeling based on registered label 

restrictions

Application Efficiency 0.95 Aerial application EFED Guidance

Number of 

Applications/Application 

Rate2

1/1.1 (dormant/delayed dormant), 

1/4.5 (orchard floor) and 2/2.2 kg ai/ha

(foliar)

Registered Labels, LUIS report 2/6/2009

The label allows dormant/delayed dormant, trunk 

spray, floor applications to almonds. All three 

types of applications were assumed to occur in 

one growing season and were modeled together. 

It is unclear if both an orchard floor and a trunk 

spray are permitted and for modeling purposes 

only orchard floor application was assumed. The 

trunk drench applications rate is provided as a 

dilution factor. 

Interval Between 

Applications

60 (following dormant application) 

and 10 days Registered Labels, LUIS report 2/6/2009

Location Specific Crop 

Scenarios and 

Application Date

CAalmond_WirringSTD, w23232

Jan. 1

Registered Labels, LUIS report 2/6/2009, Crop 

Specific Profiles,1PRZM-EXAM Scenario 

Profiles and Meteorological Data.
32

Input Parameter 

(Symbol; Unit) Value Used Reference

Apples

CAM 1

Ground spray, 

trunk application EFED Guidance 

Application Type and 

Depth of Incorporation 0 Ground application EFED Guidance

Spray Drift Fraction 0.01 Ground application AgDRIFT modeling based on registered label 

restrictions

Application Efficiency 0.99 Ground application EFED Guidance

Number of 

Applications/Application 

Rate2

2/2.2 kg ai/ha (dormant)

2/1.7 kg ai/ha (trunk)

Registered Labels, LUIS report 2/6/2009, Usage 

Data 2006-20102

Interval Between 

Applications

na

30 days Registered Labels, LUIS report 2/6/2009

Location Specific Crop 

Scenarios and 

Application Date

NCappleSTD, w03812

Jan. 1

Aug. 15

July 16

Registered Labels, LUIS report 2/6/2009, Crop 

Specific Profiles (dogwood borer: 7/15 - 8/15 for 

PA),1PRZM-EXAM Scenario Profiles and 

Meteorological Data.

Asparagus

CAM

1

2

Ground 

application, post 

harvest granular

Aerial spray, 

foliar application

EFED Guidance 

Application Type and 

Depth of Incorporation 0

Ground/Aerial

application EFED Guidance

Spray Drift Fraction 0

0.039

Ground granular 

application

Aerial liquid

application

AgDRIFT modeling based on registered label 

restrictions

Application Efficiency 1

0.95

Granular

application

Aerial application

EFED Guidance

Number of 

Applications/Application 

Rate2

2/1.7 kg ai/ha (granular)

3/1.1 kg ai/ha

Registered Labels, LUIS report 2/6/2009

The label permits 1 pre-harvest or 2 post-harvest 

applications per season. 

Interval Between 

Applications

10 days Registered Labels, LUIS report 2/6/2009

Location Specific Crop 

Scenarios and 

Application Date

MIAsparagusSTDv2, w14840

May 15

Registered Labels, LUIS report 2/6/2009, Crop 

Specific Profiles,1PRZM-EXAM Scenario 

Profiles and Meteorological Data.

Cherries

CAM 2

Ground spray, 

foliar application EFED Guidance 
33

Input Parameter 

(Symbol; Unit) Value Used Reference

Application Type and 

Depth of Incorporation 0 Ground application EFED Guidance

Spray Drift Fraction 0.01 Ground application AgDRIFT modeling based on registered label 

restrictions

Application Efficiency 0.99 Ground application EFED Guidance

Number of 

Applications/Application 

Rate2

8/1.7 kg ai/ha

2/1.7 kg ai/ha (average typical rate)

Registered Labels, LUIS report 2/6/2009, Usage 

Data 2006-20102

Interval Between 

Applications

10 days Registered Labels, LUIS report 2/6/2009

Location Specific Crop 

Scenarios and 

Application Date

MICherriesSTD, w14850

May 15

Registered Labels, LUIS report 2/6/2009, Crop 

Specific Profiles,1PRZM-EXAM Scenario 

Profiles and Meteorological Data.

Christmas Tree

CAM 2

Ground spray, 

foliar application EFED Guidance 

Application Type and 

Depth of Incorporation 0 Ground application EFED Guidance

Spray Drift Fraction 0.01 Ground application AgDRIFT modeling based on registered label 

restrictions

Application Efficiency 0.99 Ground application EFED Guidance

Number of 

Applications/Application 

Rate2

3/1.1 kg ai/ha Registered Labels, LUIS report 2/6/2009

Interval Between 

Applications

7 days Registered Labels, LUIS report 2/6/2009

Location Specific Crop 

Scenarios and 

Application Date

ORXmasTreeSTD, w24232

Aug. 1

PAappleSTD_V2, w14751

Aug. 1

Registered Labels, LUIS report 2/6/2009, Crop 

Specific Profiles,1PRZM-EXAM Scenario 

Profiles and Meteorological Data.

Citrus

CAM 2

Ground spray, 

foliar application EFED Guidance 

Application Type and 

Depth of Incorporation 0 Ground application EFED Guidance

Spray Drift Fraction 0.01

0.039

Ground application

Aerial application

AgDRIFT modeling based on registered label 

restrictions

Application Efficiency 0.99

0.95

Ground application

Aerial application EFED Guidance
34

Input Parameter 

(Symbol; Unit) Value Used Reference

Number of 

Applications/Application 

Rate2

2/3.9 (foliar) and 3/1.1 kg ai/ha

(orchard floors)

1/3.9 kg ai/ha (foliar; average typical 

rate for lemons)

2/2.8 kg ai/ha (foliar; average typical 

rate for oranges)

Registered Labels, LUIS report 2/6/2009, Usage 

Data 2006-20102

The label allows foliar and floor applications to 

citrus. Both types of applications were assumed to 

occur in one growing season and were modeled 

together. Note that, higher foliar application rate

(4.5 - 6.7 kg a.i./ha) is allowed in specific 

counties in California on some labels. 

Interval Between 

Applications

30 days (after high rate)

10 days (after low rates) Registered Labels, LUIS report 2/6/2009

Location Specific Crop 

Scenarios and 

Application Date

FLcitrusSTD, w12844

Aug. 10

Registered Labels, LUIS report 2/6/2009, Crop 

Specific Profiles, (chlorpyrifos application 

typically occur more than six months before 

harvest—harvest may occur during any month 

except July and August; most harvesting is 

expected to occur between January and March—

corresponding application dates include April thru 

September),1PRZM-EXAMS Scenario Profiles 

and Meteorological Data.

Cole Crop

CAM 2

Aerial spray, 

foliar application EFED Guidance 

Application Type and 

Depth of Incorporation 0 Aerial application EFED Guidance

Spray Drift Fraction 0.039 Aerial application AgDRIFT modeling based on registered label 

restrictions

Application Efficiency 0.95 Aerial application EFED Guidance

Number of 

Applications/Application 

Rate2

9/1.1 kg ai/ha

Registered Labels, LUIS report 2/6/2009

*In some locations it is possible to have multiple 

seasons per year. For modeling purposes three 

seasons were assumed per year; however, for 

some locations it could be possible to have more 

than three (3 1⁄2-4 seasons per year).

Interval Between 

Applications

10 day; 90 days (after every third 

application) Registered Labels, LUIS report 2/6/2009

Location Specific Crop 

Scenarios and 

Application Date

FLcabbageSTD, w12842

Jan. 1

Registered Labels, LUIS report 2/6/2009, Crop 

Specific Profiles,1PRZM-EXAM Scenario 

Profiles and Meteorological Data

Corn

CAM 2

Aerial spray, 

foliar application

Ground application 

(typical)

EFED Guidance 

Application Type and 

Depth of Incorporation

0

4 cm

Aerial application

Ground application 

(typical)

EFED Guidance
35

Input Parameter 

(Symbol; Unit) Value Used Reference

Spray Drift Fraction 0.039

0

Aerial application

Ground 

incorporated 

application 

(typical)

AgDRIFT modeling based on registered label 

restrictions

Application Efficiency 0.95

1

Aerial application

Ground 

incorporated 

application 

(typical)

EFED Guidance

Number of 

Applications/Application 

Rate2

3/1.1 kg ai/ha

1/1.0 kg ai/ha (typical use)

Registered Labels, LUIS report 2/6/2009

Usage Data 2006-20102

Interval Between 

Applications

10 days Registered Labels, LUIS report 2/6/2009

Location Specific Crop 

Scenarios and 

Application Date

KSCornStd, w13996

May 15

Registered Labels, LUIS report 2/6/2009, Crop 

Specific Profiles,1PRZM-EXAM Scenario 

Profiles and Meteorological Data.

Cotton

CAM 2

Aerial spray, 

foliar application EFED Guidance 

Application Type and 

Depth of Incorporation 0 Aerial application EFED Guidance

Spray Drift Fraction 0.039 Aerial application AgDRIFT modeling based on registered label 

restrictions

Application Efficiency 0.95 Aerial application EFED Guidance

Number of 

Applications/Application 

Rate2

3/1.1 kg ai/ha Registered Labels, LUIS report 2/6/2009

Interval Between 

Applications

10 days Registered Labels, LUIS report 2/6/2009

Location Specific Crop 

Scenarios and 

Application Date

NCcottonSTD, w13722

May 15

Registered Labels, LUIS report 2/6/2009, Crop 

Specific Profiles,1PRZM-EXAM Scenario 

Profiles and Meteorological Data.

Grape

CAM 1

Ground spray, soil 

application EFED Guidance 

Application Type and 

Depth of Incorporation 0 Ground application EFED Guidance

Spray Drift Fraction 0.01 Ground application AgDRIFT modeling based on registered label 

restrictions

Application Efficiency 0.99 Ground application EFED Guidance
36

Input Parameter 

(Symbol; Unit) Value Used Reference

Number of 

Applications/Application 

Rate2

1/37.3 kg ai/ha (drench; high rate)

1/6.7 kg ai/ha (drench; low rate)

2/2.5 kg ai/ha [average typical use for 

all grapes (raisin, table and wine)]

Registered Labels, LUIS report 2/6/2009

Usage Data 2006-20102

Note: No usage data is available for New York

Interval Between 

Applications

Not applicable Registered Labels, LUIS report 2/6/2009

Location Specific Crop 

Scenarios and 

Application Date

NYGrapesSTD, w14860

CAgrapes_WirringSTD, w93193

May 15

July15

Feb. 28

Registered Labels, LUIS report 2/6/2009, Crop 

Specific Profiles [borer treatment mid-May (5/10-

20) and mid-July (7/10-20)],1PRZM-EXAMS 

Scenario Profiles and Meteorological Data.

Legume Vegetables

CAM 4

Ground spray, soil 

incorporated EFED Guidance 

Application Type and 

Depth of Incorporation 2.5 Ground application EFED Guidance

Spray Drift Fraction 0.01 Ground application AgDRIFT modeling based on registered label 

restrictions

Application Efficiency 0.99 Ground application EFED Guidance

Number of 

Applications/Application 

Rate2

1/1.1 kg ai/ha Registered Labels, LUIS report 2/6/2009

Interval Between 

Applications

na Registered Labels, LUIS report 2/6/2009

Location Specific Crop 

Scenarios and 

Application Date

MSsoybeanSTD, w03940

May 25

Registered Labels, LUIS report 2/6/2009, Crop 

Specific Profiles,1PRZM-EXAM Scenario 

Profiles, and Meteorological Data.

Mint

CAM 2

Ground spray, 

foliar application EFED Guidance 

Application Type and 

Depth of Incorporation 0 Ground application EFED Guidance

Spray Drift Fraction 0.01 Ground application AgDRIFT modeling based on registered label 

restrictions

Application Efficiency 0.99 Ground application EFED Guidance

Number of Applications/

Application Rate2

3/2.2 kg ai/a Registered Labels

Interval Between 

Applications

90 day

Registered Labels; no minimum retreatment 

interval is provide on the label; however, the label 

only permits one preplant application, one 

growing season application and one post harvest 

application.

Location Specific Crop 

Scenarios and 

Application Date

ORmintSTD, w24232

Apr. 30

Registered Labels, LUIS report 2/6/2009, Crop 

Specific Profiles,1PRZM-EXAMS Scenario 

Profiles and Meteorological Data.
37

Input Parameter 

(Symbol; Unit) Value Used Reference

Onion Bulbs

CAM 2

Ground spray, 

foliar application EFED Guidance 

Application Type and 

Depth of Incorporation 0 Ground application EFED Guidance

Spray Drift Fraction 0.01 Ground application AgDRIFT modeling based on registered label 

restrictions

Application Efficiency 0.99 Ground application EFED Guidance

Number of Applications/

Application Rate2

2/1.1 kg ai/a

1/1.1 kg ai/a (average typical use) Registered Labels, Usage Data 2006-20102

Interval Between 

Applications

3 day

Registered Labels; no minimum retreatment 

interval is provide on the label; however, the label 

only permits one preplant application, one 

growing season application and one post harvest 

application.

Location Specific Crop 

Scenarios and 

Application Date

GAOnion_WirringSTD, w03822

Dec. 4

Registered Labels, LUIS report 2/6/2009, Crop 

Specific Profiles (planting dates November thru

February were evaluated),

1

PRZM-EXAMS 

Scenario Profiles and Meteorological Data.

Peaches

CAM 2

Ground spray, 

foliar application EFED Guidance 

Application Type and 

Depth of Incorporation 0 Ground application EFED Guidance

Spray Drift Fraction 0.01 Ground application AgDRIFT modeling based on registered label 

restrictions

Application Efficiency 0.99 Ground application EFED Guidance

Number of Applications/

Application Rate2

1/3.3 kg ai/a Registered Labels

Interval Between 

Applications

na Registered Labels

Location Specific Crop 

Scenarios and 

Application Date

GAPeachesSTD, w03813

Aug. 31

Registered Labels, LUIS report 2/6/2009, Crop 

Specific Profiles,1PRZM-EXAMS Scenario 

Profiles and Meteorological Data.

Peanut

CAM

1

4

Aerial spray, soil 

application

Ground spray, soil 

incorporated 

application

EFED Guidance 

Application Type and 

Depth of Incorporation 

(cm)

0

7.6

Aerial application

Ground application EFED Guidance
38

Input Parameter 

(Symbol; Unit) Value Used Reference

Spray Drift Fraction 0.039

0.01

Aerial application

Ground application

AgDRIFT modeling based on registered label 

restrictions

Application Efficiency

0.95

0.99

Aerial application

Ground application EFED Guidance

Number of Applications/

Application Rate2

2/2.2 kg ai/a

1/2.2 kg ai/a Registered Labels

Interval Between 

Applications

ns Registered Labels

Location Specific Crop 

Scenarios and 

Application Date

NCPeanutSTD, w13722

May 31

Registered Labels, LUIS report 2/6/2009, Crop 

Specific Profiles,1PRZM-EXAMS Scenario 

Profiles and Meteorological Data.

Pecans

CAM 2

Ground spray, 

foliar application EFED Guidance 

Application Type and 

Depth of Incorporation 0 Ground application EFED Guidance

Spray Drift Fraction 0.01

0.039

Ground application

Aerial application

AgDRIFT modeling based on registered label 

restrictions

Application Efficiency 0.99

0.95

Ground application

Aerial application EFED Guidance

Number of 

Applications/Application 

Rate2

3/2.2 kg ai/ha (foliar)

1/4.5 kg ai/ha (orchard floor)

3/1.0 kg ai/ha (foliar; average typical 

use)

3/1.4 kg ai/ha (foliar; average typical 

use)

Registered Labels, LUIS report 2/6/2009, Usage 

Data 2006-20102

Interval Between 

Applications

10 day Registered Labels, LUIS report 2/6/2009

Location Specific Crop 

Scenarios and 

Application Date

GAPecansSTD, w93805

June 15

Registered Labels, LUIS report 2/6/2009, Crop 

Specific Profiles,1PRZM-EXAM Scenario 

Profiles and Meteorological Data.

Sorghum

CAM 4

Ground spray, 

foliar application EFED Guidance 

Application Type and 

Depth of Incorporation 

(cm)

0

Aerial application

Ground application EFED Guidance

Spray Drift Fraction 0.01

Aerial application

Ground application

AgDRIFT modeling based on registered label 

restrictions

Application Efficiency 0.99

Aerial application

Ground application EFED Guidance

Number of Applications/

Application Rate2

3/0.56 kg ai/a

2/1.1 kg ai/a Registered Labels
39

Input Parameter 

(Symbol; Unit) Value Used Reference

Interval Between 

Applications

ns Registered Labels

Location Specific Crop 

Scenarios and 

Application Date

KSsorghumSTD, w13996

May 30

Registered Labels, LUIS report 2/6/2009, Crop 

Specific Profiles,1PRZM-EXAMS Scenario 

Profiles and Meteorological Data.

Strawberries

CAM 2

Aerial spray, 

foliar application EFED Guidance 

Application Type and 

Depth of Incorporation 0 Aerial application EFED Guidance

Spray Drift Fraction 0.039 Aerial application AgDRIFT modeling based on registered label 

restrictions

Application Efficiency 0.95 Aerial application EFED Guidance

Number of 

Applications/Application 

Rate2

1/2.2 and 2/1.1 kg ai/ha Registered Labels, LUIS report 2/6/2009

Interval Between 

Applications

10 day Registered Labels, LUIS report 2/6/2009

Location Specific Crop 

Scenarios and 

Application Date

CAfruit_WirringSTD, w93193

Jan. 29

Registered Labels, LUIS report 2/6/2009, Crop 

Specific Profiles,1PRZM-EXAM Scenario 

Profiles and Meteorological Data.

Sugar Beets

CAM 2

4

Ground spray, 

foliar application

Granular 

incorporated 

application

EFED Guidance 

Application Type and 

Depth of Incorporation 0 Ground application EFED Guidance

Spray Drift Fraction 0.01

0

Ground application

Granular 

incorporated 

application

AgDRIFT modeling based on registered label 

restrictions

Application Efficiency 0.99

1

Ground application

Granular 

incorporated 

application

EFED Guidance

Number of 

Applications/Application 

Rate2

3/1.1 kg ai/ha

3/0.94 kg ai/ha

1/1.7 1/0.6 kg ai/ha (average typical 

use rate)

Registered Labels, LUIS report 2/6/2009

Usage Data 2006-20102

First typical use application is a granular 

incorporation followed by a foliar ground 

application

Interval Between 

Applications

10 day Registered Labels, LUIS report 2/6/2009
40

Input Parameter 

(Symbol; Unit) Value Used Reference

Location Specific Crop 

Scenarios and 

Application Date

MNsugarbeetSTD, w14914

May 28

Registered Labels, LUIS report 2/6/2009, Crop 

Specific Profiles,1PRZM-EXAM Scenario 

Profiles and Meteorological Data.

Sunflower, Wheat

CAM 2

Ground spray, 

foliar application EFED Guidance 

Application Type and 

Depth of Incorporation 0 Ground application EFED Guidance

Spray Drift Fraction 0.01 Ground application AgDRIFT modeling based on registered label 

restrictions

Application Efficiency 0.99 Ground application EFED Guidance

Number of 

Applications/Application 

Rate2

2/1.7 kg ai/ha (sunflower)

and 2/0.56 (wheat) kg ai/ha

Registered Labels, LUIS report 2/6/2009

Sunflowers and wheat are grown as rotational 

crops in some locations. One season of each crop 

was assumed for modeling since a yearly 

application limit was not provided on the label.

Interval Between 

Applications

7 day and 158 days Registered Labels, LUIS report 2/6/2009

Location Specific Crop 

Scenarios and 

Application Date

GAPecansSTD, w93805

June 15

Registered Labels, LUIS report 2/6/2009, Crop 

Specific Profiles,1PRZM-EXAM Scenario 

Profiles and Meteorological Data.

Sweet Potato

CAM 1

Aerial spray, soil 

application EFED Guidance 

Application Type and 

Depth of Incorporation 0 Aerial application EFED Guidance

Spray Drift Fraction 0.039 Aerial application AgDRIFT modeling based on registered label 

restrictions

Application Efficiency 0.95 Aerial application EFED Guidance

Number of 

Applications/Application 

Rate2

1/2.2 kg ai/ha Registered Labels, LUIS report 2/6/2009

Interval Between 

Applications

10 day Registered Labels, LUIS report 2/6/2009

Location Specific Crop 

Scenarios and 

Application Date

NCSweetPotatoSTD, w13722

May 15

Registered Labels, LUIS report 2/6/2009, Crop 

Specific Profiles(growing season Apr. 1-Oct. 10), 

1

PRZM-EXAM Scenario Profiles and 

Meteorological Data.

Tobacco

CAM 4

Ground spray, 

incorporated 

application

EFED Guidance 

Application Type and 

Depth of Incorporation 5.1 cm Ground application EFED Guidance
41

Input Parameter 

(Symbol; Unit) Value Used Reference

Spray Drift Fraction 0.01 Ground application AgDRIFT modeling based on registered label 

restrictions

Application Efficiency 0.99 Ground application EFED Guidance

Number of 

Applications/

Application Rate2

1/2.2 kg ai/a Registered Labels, LUIS report 2/6/2009

Interval Between 

Applications

na Registered Labels (no minimum retreatment 

interval is provide on the label)

Location Specific Crop 

Scenarios and 

Application Date

NCtobaccoSTD, w13722

April 15

Registered Labels, LUIS report 2/6/2009, Crop 

Specific Profiles,1PRZM-EXAM Scenario 

Profiles and Meteorological Data.

Turfgrass

CAM 2

Ground spray, 

foliar application EFED Guidance 

Application Type and 

Depth of Incorporation 0 Ground application EFED Guidance

Spray Drift Fraction 0.01 Ground application AgDRIFT modeling based on registered label 

restrictions

Application Efficiency 0.99 Ground application EFED Guidance

Number of 

Applications/

Application Rate2

26/4.4 kg ai/a

26/2.2 kg ai/a

6/2.2, 

Registered Labels, PRZM-EXAMS can only 

accommodate 26 applications; labels suggest 

multiple application May-August depending on 

target pest

Interval Between 

Applications

3 day

3 day

30, 7, 7, 60, and 30 days

Registered Labels (no minimum retreatment 

interval is provide on the label)

Location Specific Crop 

Scenarios and 

Application Date

PAturfSTD, w14751

May 9

Registered Labels (suggested applications are mid 

May-July), LUIS report 2/6/2009, Crop Specific 

Profiles,1PRZM-EXAMS Scenario Profiles and 

Meteorological Data.

1. National Information System for the Regional IPM Centers, http://www.ipmcenters.org/cropprofiles/

2. Information provided by BEAD June 8, 2011

Modeling Data

The EDWCs reported in this section are based on Tier I groundwater and Tier II surface water 

modeling for currently registered uses of chlorpyrifos. EDWCs are provided for chlorpyrifos and 

chlorpyrifos-oxon. As detailed in Table 11, EDWCs for chlorpyrifos and chlorpyrifos-oxon 

generated from surface water sources provide the most conservative estimations of the potential 

exposure to either of these chemicals in drinking water. Characterization of the reported EDWCs 

for the various chlorpyrifos use patterns evaluated in this assessment, including assumptions and 

uncertainties taken into consideration for each modeled scenario, are provided in Tables 10 and

11. Further analysis of the EDWCs by source follows Table 11.
42

Table 11. EDWCs Resulting from Chlorpyrifos Use

Represented Crop Use Chlorpyrifos Chlorpyrifos-Oxon1

Drinking Water 

Source

Peak 

EDWC

μg/L (ppb)

Yearly 

Mean μg/L 

(ppb)

Average of 

Yearly Means 

μg/L (ppb)

Peak 

EDWC

μg/L 

(ppb)

Yearly 

Mean 

μg/L (ppb)

Average of 

Yearly Means 

μg/L (ppb)

Alfalfa

Surface Water 46.54 3.85 2.29 44.41 3.68 2.18

Groundwater 0.04 0.04

Comments: The Texas alfalfa scenario was used for modeling alfalfa. This PRZM scenario provides EDWCs for an 

area of the US known to have high organophosphate usage. The Texas alfalfa scenario was developed as part of the 

OP cumulative assessment. Current chlorpyrifos labels provide a maximum single application, the maximum number 

of applications per year, per season, or per cutting and a minimum retreatment interval for alfalfa. In some locations it 

is possible to have up to 9 cuttings (this may be the result of multiple seasons per year). For such scenarios the 

reported EDWCs are not expected to be conservative. 

Almond

Surface Water 18.16 3.29 2.52 17.32 3.14 2.41

Groundwater 0.09 0.09

Comments: Chlorpyrifos labels permit multiple types of applications on almonds such as dormant/delayed dormant 

applications, foliar, trunk drenches, as well as orchard floor applications. Labels do not restrict the amount of 

chlorpyrifos that can be applied to an individual almond orchard in a year; therefore, all application types were 

assumed to occur within one year for assessment purposes. The application rate for trunk spray/preplant dip is a 

dilution factor, 3 lbs ai/100 gallons, of water and was not modeled. This was done as it is unclear if orchard floors and 

trunk spray can occur within the same year. The reported EDWCs do not reflect the inclusion of the trunk spray. 

Therefore, if a trunk spray can be applied in addition to the other types of applications the reported EDWCs may 

underestimate the risk of chlorpyrifos applications to almonds. EFED recommends that all application rates be 

reported in lbs ai/a or information that can be used to derive such a rate be provided on the label. The labels should 

also clearly state the maximum single and yearly application rates for chlorpyrifos on almonds. 

Apple

Surface Water 40.88 4.53 2.72 39.00 4.32 2.59

Surface Water (typical) 40.19 4.19 2.62 38.34 3.99 2.50

Groundwater 0.02 0.02

Comments: The trunk drench application rate is only provided as a dilution factor (1.5 lbs ai/100 gallons of water). 

The application rate was assumed to be 1.5 lbs ai/a; however, it is possible that the application rate is significantly 

higher. If the application rate is higher the EDWCs reported here likely underestimate the actual exposure. Typical use 

rate data from the last five years indicate that, in general, multiple applications of chlorpyrifos are made to apples in a 

given year. For the purposes of characterizing the typical use rates, two applications were modeled and the EDWCs are 

reported above. Since there is no application interval specified on the label, a 30 day application interval was assumed 

based on the maximum application interval specified on the labels (citrus). 

Asparagus

Surface Water 10.93 1.27 0.70 10.43 1.21 0.67

Surface Water410.11 0.68 0.25 9.64 0.65 0.24

Groundwater 0.03 0.03

Comments: Chlorpyrifos labels permit both liquid and granular applications of chlorpyrifos on asparagus. Granular 

applications reduce pesticide transport via spray drift; however, it is unclear how the granular formulation impacts the 

dissipation of chlorpyrifos in the environment. The granular formulation could reduce the dissipation rate of 

chlorpyrifos. Maximum single application rates are higher for granular formulations than liquid formulations; 

however, liquid formulations permit more applications. Some liquid formulations do not specify yearly maximum 

application rates. For modeling purposes, 3lbs ai/a was assumed to be the yearly maximum application rate for both 

formulation types. This corresponds to 1 pre-harvest or 2 post-harvest applications per season for liquid formulations. 

The results suggest that applications of granular chlorpyrifos do not significantly reduce the EDWCs compared to 

liquid formulations. All labels should also clearly state the maximum yearly application rates for chlorpyrifos on 

asparagus. 
43

Represented Crop Use Chlorpyrifos Chlorpyrifos-Oxon1

Drinking Water 

Source

Peak 

EDWC

μg/L (ppb)

Yearly 

Mean μg/L 

(ppb)

Average of 

Yearly Means 

μg/L (ppb)

Peak 

EDWC

μg/L 

(ppb)

Yearly 

Mean 

μg/L (ppb)

Average of 

Yearly Means 

μg/L (ppb)

Cherries

Surface Water 113.80 18.18 11.06 108.58 17.35 10.55

Surface Water (typical) 23.02 4.04 2.26 21.96 3.85 2.15

Groundwater 0.12 0.12

Comments: Recently approved labels better define chlorpyrifos uses on cherries; however, the application rates are 

provided as dilution factors and do not restrict the lbs ai/a that can be applied to cherries. EFED recommends that all 

application rates be reported in lbs ai/a or information that can be used to derive such a rate. The labels should also 

clearly state the maximum single and yearly application rates for chlorpyrifos on cherries. 

Christmas Trees

Surface Water 32.10 3.16 1.92 30.63 3.01 1.83

Groundwater 0.09 0.09

Comments: The application rate for stump treatment is provided as a dilution factor (3 lbs ai/gal of water). This type 

of application was not assessed and is not represented by the reported EDWCs. EFED recommends that labels be 

reviewed to clearly state the maximum single and yearly application rates for chlorpyrifos use on Christmas trees. 

Citrus

Surface Water 90.74 11.70 7.72 86.57 11.16 7.37

Surface Water (typical) 44.48 6.31 4.36 42.44 6.02 4.16

Groundwater 0.11 0.10

Comments: Chlorpyrifos labels permit multiple types of applications on citrus, including orchard floor and foliar 

applications. Application rates for both types of applications specifically exclude the other type of application; 

therefore, it was assumed that both types of applications will occur in an individual citrus orchard within a year. Since 

the higher foliar application rates are only allowed in California it was not used in modeling of Florida citrus, which is 

expected to be protective of other citrus scenarios. Typical use rates for lemons and oranges were modeled; oranges 

provided the most conservative EDWCs.

Cole Crops

Surface Water 66.42 9.43 6.59 63.37 9.00 6.28

Groundwater 0.06 0.06

Comments: Current chlorpyrifos labels provide application rate restrictions per season and not per year. Since there 

are many location in the US that can accommodate three cole crops per year, three growing seasons were modeled and 

are reflected in the reported EDWCs. EFED recommends that labels be updated to clearly state the maximum yearly 

application rates for chlorpyrifos use on cole crops. 

Corn, Soybean

Surface Water 30.90 4.61 3.12 29.49 4.39 2.98

Surface Water (typical) 4.39 0.82 0.50 4.19 0.78 0.48

Groundwater 0.03 0.03

Comments: Current chlorpyrifos labels permit both liquid and granular applications of chlorpyrifos on corn. Granular 

applications reduce pesticide transport via spray drift; however, it is unclear how the granular formulation impacts the 

dissipation of chlorpyrifos in the environment. The granular formulation could reduce the dissipation rate of 

chlorpyrifos. Typical use rates are for corn and the resulting EDWCs may not represent soybean. 

Cotton

Surface Water 43.69 6.76 5.24 41.68 6.45 5.00

Groundwater 0.03 0.03

Comments: n/a

Grape

Surface Water2494.00 73.19 52.14 471.33 69.83 49.74

Surface Water2, 4 623.70 82.05 54.72 595.07 78.29 52.20

Surface Water 112.20 14.74 9.83 107.05 14.06 9.38

Surface Water (typical 2.89 0.43 0.26 2.76 0.41 0.25
44

Represented Crop Use Chlorpyrifos Chlorpyrifos-Oxon1

Drinking Water 

Source

Peak 

EDWC

μg/L (ppb)

Yearly 

Mean μg/L 

(ppb)

Average of 

Yearly Means 

μg/L (ppb)

Peak 

EDWC

μg/L 

(ppb)

Yearly 

Mean 

μg/L (ppb)

Average of 

Yearly Means 

μg/L (ppb)

two application)

Groundwater 0.34 0.32

Comments: Chlorpyrifos labels permit soil surface applications at a maximum single rate of 7.5 x 10-4lb/ft2 to 7.7 x 

10-4lb/ft2(32.7 to 33.5 lbs ai/a). Some labels provide a yearly application rate restriction of 6 lbs/a (062719-00301) 

while other labels do not. Some labels specify restriction of 1 lbs ai/a for pre-bloom applications, but not for other 

application types such as a post-bloom application. The high application rate is permitted on the 11-15ft2 (3.75-4.4 ft 

circle) at the base of the vine (trunk). The maximum number of grape vines that can be grown per acre is unknown; 

therefore, because of the proximity of grape vines (trunks) in a vineyard it may be possible that an entire acre can be 

treated at this high application rate. If there is insect pressure within a vineyard, the entire vineyard may be treated 

because of the susceptibility associated with proximity. Two different application dates were modeled for the highest 

application rate and the resulting EDWCs are reported above. The results indicate that application timing can 

significantly impact the EDWCs for this use pattern. The labels should clearly state the maximum single and yearly 

application rates for chlorpyrifos on grape in lbs ai/a. Because of the high application rate, additional information on 

application timing will significantly reduce the uncertainty associated with this use. Typical use rate data indicate that, 

in general, multiple applications of chlorpyrifos are made to grapes in a given year. For the purposes of characterizing 

the typical use rates over the last five years, two applications were modeled and the EDWCs are reported above. Since 

there is no application interval specified on the label, a 150 day application interval was assumed based on expected 

pest pressure.

Legume Vegetables (except soybean)

Surface Water 8.06 1.29 0.73 7.69 1.23 0.70

Groundwater 0.01 0.01

Comments: Although chlorpyrifos applications are not permitted in Mississippi for legume vegetables, the standard 

scenario for Mississippi soybean was used as a surrogate for legume vegetables. In some locations such as California,

legume vegetables such as snap beans can have two crops per year (spring and fall). Only one crop per year was 

modeled. If more than one crop is planted per year the reported EDWCs may not be conservative.

Mint

Surface Water 17.61 2.94 2.21 16.80 2.81 2.11

Groundwater 0.06 0.06

Comments: Chlorpyrifos labels permit multiple types of applications on mint, including pre-plant and foliar 

applications. There is no minimum retreatment interval provided on the label. Based on the use pattern--one preplant 

application, one growing season application and one post harvest application—and the fact that there is a 90 day preharvest application restriction, a 90 day interval was chosen for modeling. If applications occur more frequently than 

90 days the reported EDWCs may not be conservative. 

Onion Bulbs

Surface Water 8.31 1.50 0.95 7.93 1.43 0.91

Groundwater 0.02 0.02

Comments: The reported EDWCs are reflective of two non-incorporated soil applications. The label suggests that the 

at-plant soil drench should be incorporated to at least 1 inch. Incorporation will reduce the surface water EDWCs; 

however, a significant impact is not expected. Since chlorpyrifos applications to onion bulbs do not result in the 

highest EDWCs, it should not impact the conclusions of this assessment. Additional modeling can be completed that 

considers incorporation if needed.

Peaches

Surface Water 35.20 2.39 1.45 33.58 2.28 1.38

Groundwater 0.03 0.03

Comments: Labels permit multiple types of applications; however, recently approved labels only permit one 

application of any product containing chlorpyrifos per year. If these revisions are not intended for all labels, the 

EDWCs reported above may not be protective for chlorpyrifos use on peaches. For modeling purposes the highest 

application was used and assumed to be the trunk drench. Since the trunk drench is provided as a dilution factor (3 lbs 

ai/gal of water), it was assumed that all 100 gals would be applied to one acre; therefore, the application rate is 

equivalent to 3 lbs ai/a. If more than 100 gallons of the (3 lbs ai/gal of water) is applied to an acre, the reported 
45

Represented Crop Use Chlorpyrifos Chlorpyrifos-Oxon1

Drinking Water 

Source

Peak 

EDWC

μg/L (ppb)

Yearly 

Mean μg/L 

(ppb)

Average of 

Yearly Means 

μg/L (ppb)

Peak 

EDWC

μg/L 

(ppb)

Yearly 

Mean 

μg/L (ppb)

Average of 

Yearly Means 

μg/L (ppb)

EDWCs may not be protective. EFED recommends that labels be updated to clearly state the maximum single and 

yearly application rates for use on peaches, as well as other tree fruits. 

Peanut

Surface Water 59.85 6.17 3.40 57.10 5.89 3.25

Surface Water57.77 0.81 0.49 7.42 0.47 0.54

Groundwater 0.04 0.04

Comments: The language on some of the labels is conflicting. For example, 062719-00220 permits pre-plant 

broadcast applications in the general remarks suggestions; however, under the specific use restriction section the label 

suggests both preplant and post plant applications are permitted for no more than 4 lbs ai/a per season. A recently 

approved label (66222-19) only permits one soil applied preplant broadcast spray (2 lbs ai/a per season). Both 

scenarios were modeled and the EDWCs are reported above. The reported EDWCs for two applications are reflective 

of two non-incorporated aerial soil applications. A 10 day application interval was used for modeling; however, no 

application interval is specified on the labels. If applications are made with less than a 10 day application interval, the 

reported EDWCs may not be protective. The label suggests that the preplant application be incorporated to at least 3 

inches. Incorporation will reduce the surface water EDWCs. Since chlorpyrifos applications to peanuts do not result in 

the highest EDWCs, it doesn’t impact the conclusions of this assessment. Additional modeling for the two application 

scenario that considers incorporation can be completed, if needed. 

Pecans

Surface Water 115.50 15.71 8.82 110.20 14.99 8.41

Surface Water (typical) 29.55 4.07 2.33 28.19 3.88 2.23

Groundwater 0.10 0.10

Comments: Chlorpyrifos labels permit multiple types of applications on pecans including orchard floor and foliar 

applications. Application rate restrictions are provided for both types of applications, but do not limit the amount of 

chlorpyrifos that can be applied by another type of application. Therefore, it was assumed that both types of 

applications will occur in an individual pecan orchard within a year. 

Sorghum

Surface Water 25.83 2.63 1.74 24.64 2.51 1.66

Groundwater 0.03 0.03

Comments: n/a

Strawberries

Surface Water 34.79 5.34 3.73 33.19 5.09 3.56

Groundwater 0.04 0.04

Comments: n/a

Sugar Beets

Surface Water 10.55 1.12 0.69 10.06 1.07 0.65

Surface Water (typical) 15.05 4.51 1.94 14.36 4.30 1.85

Groundwater 0.03 0.03

Comments: n/a

Sunflower, Wheat

Surface Water 76.63 6.79 4.40 73.12 6.48 4.20

Groundwater 0.04 0.04

Comments: Sunflowers and wheat are grown as rotational crops in some locations. One season of each crop was 

assumed for modeling since a yearly application limit for chlorpyrifos was not provided on the label. Current labels do 

not specify an application interval for wheat. EFED recommends that labels be updated to clearly state application 

intervals for wheat.

Sweet Potatoes

Surface Water 40.93 5.42 4.04 39.05 5.17 3.86

Groundwater 0.02 0.02

Comments: n/a
46

Represented Crop Use Chlorpyrifos Chlorpyrifos-Oxon1

Drinking Water 

Source

Peak 

EDWC

μg/L (ppb)

Yearly 

Mean μg/L 

(ppb)

Average of 

Yearly Means 

μg/L (ppb)

Peak 

EDWC

μg/L 

(ppb)

Yearly 

Mean 

μg/L (ppb)

Average of 

Yearly Means 

μg/L (ppb)

Tobacco

Surface Water 8.77 0.73 0.50 0.69 0.48 0.61

Groundwater 0.02 0.02

Comments: Recently approved labels have maximum single application rates of 1 lb ai/a; however, the label data 

report indicates single application rates are up to 2 lbs ai/a. The higher application rate was modeled. 

Turfgrass (sod farms, turf, industrial plant, and road medians), Ornamentals

Surface Water 446.90 40.67 21.17 426.39 38.80 20.20

Surface Water6223.40 5.65 2.70 213.15 19.41 10.10

Surface Water645.39 5.65 2.70 43.30 5.39 2.58

Groundwater 1.1 1.0

Comments: The EDWCs for turf are the result of current labels not having specified a maximum seasonal application 

rate restriction or a minimum retreatment interval. For modeling, 26 applications were assumed with a three day 

application interval. Some ornamental labels suggest a second application after three days; therefore, the assumption of 

the three day retreatment intervals was viewed as not being an overly conservative assumption. A three day application 

interval is also supported by the worker re-entry restriction (1 day), as well as the time it take to scout (1 day) for pests 

and arrange for treatment (1 day). PRZM is only able to accommodate 26 applications. If more applications occur, the 

reported EDWCs may underestimate the potential exposure to chlorpyrifos and chlorpyrifos-oxon. Turf labels suggest 

multiple applications May-August; therefore, it is likely there are a number of applications occurring on turf. If 

applications occur more frequently the EDWCs reported here may underestimate the risk from chlorpyrifos 

applications to turf. Current labels for ornamentals permit applications up to 4 lbs on an as needed basis. If multiple 4 

lb applications occur, the reported EDWCs may underestimate the potential exposure to chlorpyrifos and chlorpyrifos

oxon. A result for turf applications at 2 lbs is also reported. As a low end turf scenario, a second modeling scenario 

was developed which took into account only those applications that are specified on current labels (uses that include 

suggested application timeframes). This scenario, however, doesn’t take into account applications to turf for pests that 

the label does not include details on the specific application timing.

Wood Products

Surface Water nd nd nd nd nd nd

Groundwater nd nd

Comments: The label doesn’t provide an application retreatment interval and it is unclear if the application rate 

provided on the label is per square foot of wood or land. There is no annual application restrictions provided on the 

label. In addition, there is no usage data available. It is also unclear if applications occur in centralized locations such 

as a lumber yard, or if applications are localized such as individual utility poles. Because of all these uncertainties, this 

use scenario was not modeled. This use scenario is not expected to result in higher EDWCs than those reported here for 

other use scenarios, as the application rate (lb ai/a) is expected to be lower for the treatment of individual fence posts, 

utility poles, etc. However, if wood treatment is occurring at a lumber mill or lumber yard on a large quantity of wood 

products or on a fairly frequent basis, the EDWCs could be high. This is an uncertainty of this assessment. 

1. Chlorpyrifos-oxon EDWCs were derived from chlorpyrifos EDWCs. This was done by multiplying 

chlorpyrifos EDWCs by 0.9541 (molecular weight correction factor) and 100% (a conservative estimate of the 

maximum possible conversion in the environment and/or during water purification). 

2. Reported EDWCs for surface water are the result of a high application rate trunk drench. 

3. Reported EDWCs is for granular application. 

4. Alternative application date.

5. Single soil incorporated application

6. Alternative turf scenarios

Groundwater modeling provides a single output value that represents the concentrations that might be expected 

in shallow unconfined aquifers under sandy soils. Output is recommended for both acute and chronic 

endpoints.

nd= not determined
47

Surface Water

Tier II chlorpyrifos-oxon EDWCs for all modeled scenarios are provided in Table 11. Figure 7 

provides a visual representation of the Tier II surface water EDWCs for chlorpyrifos-oxon. 

EDWCs for chlorpyrifos and chlorpyrifos-oxon range over a few orders of magnitude. These 

EDWCs are derived from chlorpyrifos uses on a national basis. In general, the EDWCs reported 

in this assessment are higher than previously reported in the RED and remodeled in a 2007 DWA 

(DP 336295). A summary of the most conservative EDWCs reported in the RED and the 2007 

remodeled EDWCs are presented in Table 12. 

Grape, corn/soybean and sugar beet were singled out as representative crops because there is a 

large amount (>100,000 lb) of chlorpyrifos applied to these crops per year, a large portion 

(percent treated/percent crop planted) of these crops are treated with chlorpyrifos and/or the use 

locations are distributed throughout the United States. In addition, the reported EDWCs for 

grape, corn/soybean and sugar beets are generally representative of EDWCs for other 

chlorpyrifos use scenarios. The chlorpyrifos use profiles for grape, corn/soybean and sugar beets 

are compared to other chlorpyrifos use scenarios in Tables 13-15. These tables highlight the 

amount of chlorpyrifos used on each crop, the percentage of the crop treated with chlorpyrifos 

and if the crops are grown in areas where surface water intakes serve community drinking water 

supplies. While the analysis provided in Tables 13-15 do not specifically take into account the 

co-occurrence of multiple chlorpyrifos uses (multiple crops) in the one watershed, the use of a 

PCA value of 1 (considers 100% of the watershed is treated) in the reported EDWCs accounts 

for multiple uses, including turf, within a watershed. 

There are two modeled chlorpyrifos use scenarios that result in EDWCs that are significantly 

higher than the majority of the modeled chlorpyrifos use scenarios. These use scenarios are for 

grape and turf, as shown in Figure 7. The EDWCs reported for Grape HR (high rate) are the 

result of a high application rate trunk drench, which is currently permitted on a few labels and 

may not represent actual or intended use of chlorpyrifos on grape. Some recently approved labels 

restrict the use of chlorpyrifos on grape to 6 lbs a.i./a; however, active labels remain that permit 

the higher application rate. Addition of a per year application restriction of 6 lb a.i./a reduces the 

EDWCs 6-fold. Typical use rates for grape are approximately 2.5 lb a.i./a. The typical use rate 

was also modeled and the results compared to the results for the other grape scenarios. EDWCs 

for all grape scenarios are presented in Figure 8. The EDWCs for the typical use rate results in 

EDWCs that are approximately one third the EDWCs calculated for the 6 lb a.i/a scenario. All 

EDWCs are reported in Table 11. 

The EDWCs reported for turf FA (frequent applications) is based on 26 applications (limit of 

PRZM-EXAMS) and a 3 day application interval. This scenario was developed to highlight the 

uncertainty associated with the unrestricted (labels do not currently restrict the number of 

chlorpyrifos applications per year) use of chlorpyrifos on turf and may not represent actual or 

intended use of chlorpyrifos on turf. However, if more than 26 applications are made per year, or 

if the application interval is less than 3 days, the EDWCs reported in this DWA may 

underestimate the exposures resulting from chlorpyrifos use on turf. For some of the target pests 

included on the turf label there are a number of suggested application dates/timeframes and 

retreatment cycles; however, there are many pests for which this information is not provided. 
48

a)

0

100

200

300

400

500

600 Chlorpyrifos-oxon Estimated Drinking Water Concetrations (ppb)

Scenario

1-in-10 Year Peak

b)

0

1 0

2 0

3 0

4 0

5 0

6 0

7 0

8 0 Chlorpyrifos-oxon Estimated Drinking Water Concetrations (ppb)

Scenario

1-in-10 Year Annual Average

c)

0

1 0

2 0

3 0

4 0

5 0 Chlorpyrifos-oxon Estimated Drinking Water Concetrations (ppb)

Scenario

30 Year Average

Figure 7. Estimated Drinking Water Concentrations of Chlorpyrifos-oxon Resulting From 

the Registered Uses of Chlorpyrifos a) 1-in-10 year peak, b) 1-in-10 Year Annual Mean and 

3) 30 Year Average; HR (High Rate), LR (Low Rate), FA (frequent application), TP (target 

pest)
49

Table 12. Comparison of Reported EDWCs for chlorpyrifos and chlorpyrifos-oxon 

resulting from chlorpyrifos use; chlorpyrifos EDWCs from the RED were used to generate 

chlorpyrifos-oxon EDWCs. Chlorpyrifos-oxon EDWCs were not provided in the RED. 

Crop Scenario

 1-in-10 

Year 

Peak

 1-in-10 

Year 

Annual 

Average

30 Year 

Average

 1-in-10 

Year 

Peak

 1-in-10 

Year 

Annual 

Average

30 Year 

Average

Grapes LR 112.20 14.74 9.83 107.05 14.06 9.38

Corn/Soybean 30.90 4.61 3.12 29.49 4.39 2.98

Sugar beets 10.55 1.12 0.69 10.06 1.07 0.65

Tobacco 8.37 0.69 0.48 7.99 0.66 0.45

Tobacco1

77.91 18.96 14.26 74.33 18.09 13.61

Tobacco 36.73 6.89 4.72 35.04 6.57 4.50

RED Drinking Water Assessment

2007 Reevaluation of RED Modeling (updated tobacco label)

Chlorpyrifos (ppb) Chlorpyrifos-oxon (ppb)

Preliminary 2011 Drinking Water Assessment

1. RED values were previously reported for the farm pond (30.6 μg/L 1-in-10 Year Peak). The reported 

values have been adjusted for the index reservoir. 

Table 13. Representation of Estimated Drinking Water Concentrations of Chlorpyrifos and 

Chlorpyrifos-oxon Resulting From Chlorpyrifos Use on Grape (bold font)

Crop

Pounds of 

Chlorpyrifos 

Applied to Crop 

per Year

Maximum 

Percent of Crop 

Treated with 

Chlorpyrifos

Maximum Annual 

Chlorpyrifos Use (lb a.i./sq 

mi) Known to Grow 

Substantial Amounts of the 

Represented Crop 

Crop Grown in Areas 

Known to Have 

Community Water Shed 

Surface Water Intakes

Cherries 70,000 45 61 yes

Grape 100,000 15 30 yes

Lemons 90,000 60 61 yes

Oranges 400,000 35 61 yes

Pecan 300,000 40 30 yes
50

Table 14. Representation of Estimated Drinking Water Concentrations of Chlorpyrifos and 

Chlorpyrifos-oxon Resulting From Chlorpyrifos Use on Corn/Soybean (bold font)

Crop

Pounds of 

Chlorpyrifos 

Applied to Crop 

per Year

Maximum 

Percent of Crop 

Treated with 

Chlorpyrifos

Maximum Annual 

Chlorpyrifos Use (lb a.i./sq 

mi) Known to Grow 

Substantial Amounts of the 

Represented Crop 

Crop Grown in Areas 

Known to Have 

Community Water Shed 

Surface Water Intakes

Apple 400,000 65 30 yes

Corn 2,900,000 5 61 yes

Sorghum 20,000 <2.5 2 yes

Soybean 1,100,000 10 61 yes

Strawberries 10,000 30 61 yes

Table 15. Representation of Estimated Drinking Water Concentrations of Chlorpyrifos 

and Chlorpyrifos-oxon Resulting From Chlorpyrifos Use on Sugar Beet (bold font)

Crop

Pounds of 

Chlorpyrifos 

Applied to Crop 

per Year

Maximum 

Percent of Crop 

Treated with 

Chlorpyrifos

Maximum Annual 

Chlorpyrifos Use (lb a.i./sq 

mi) Known to Grow 

Substantial Amounts of the 

Represented Crop 

Crop Grown in Areas 

Known to Have 

Community Water Shed 

Surface Water Intakes

Asparagus 20,000 45 61 yes

Green Beans 3,000 5 61 yes

Mint 50,000 25 61 yes

Onion 60,000 50 61 yes

Sugar Beet 200,000 20 2 yes

Tobacco 100,000 15 12 yes

0

100

200

300

400

500

600

1-in-10 Year Peak 1-in-10 Year Annual 

Average

30 Year Average

Chlorpyrifos-oxon Estimated Drinking Water Concetrations (ppb)

Grape HR

Grape LR

Grape Typical

Figure 8. Estimated Drinking Water Concentrations of Chlorpyrifos-oxon Resulting From 

Chlorpyrifos Use on Grape
51

Typical chlorpyrifos usage information for turf would help EFED further refine its final drinking 

water assessment. If only those applications that are prescribed on the label are considered for 

modeling purposes, the EDWCs are significantly lower than the Turf FA scenario as shown in 

Figure 9 for Turf TP (target pest). Addition of an application interval and a maximum yearly 

application rate on the turf labels will reduce exposure to chlorpyrifos-oxon in drinking water 

and reduce the uncertainties associated with this assessment. 

0

5 0

100

150

200

250

300

350

400

450

1-in-10 Year Peak 1-in-10 Year Annual 

Average

30 Year Average

Chlorpyrifos-oxon Estimated Drinking Water Concetrations (ppb)

Turf FA

Turf TP

Figure 9. Estimated Drinking Water Concentrations of Chlorpyrifos-oxon Resulting From 

Chlorpyrifos Use on Turf

Typical application rates (single application rate, application number per year, and agronomic 

practices) were obtained from BEAD and modeled.7 A comparison of typical use rates and the 

maximum label rates are shown in Table 16. EDWCs resulting from maximum application rate 

scenarios (standard) are compared to typical application rate scenarios (typical) in Table 11 as 

well as Table 16. In general, typical single application rates and the typical number of 

applications per year can vary from those provided on the label. The EDWCs for typical use 

scenarios are based on the average typical application rate and not the typical upper bound rate as 

recommended by BEAD.7In most cases, typical use rate scenarios result in lower EDWCs than 

the maximum use rate scenarios. For corn and sugar beets the typical average use rates are 

similar to the maximum rates but the number of applications applied each year is less than the 

label maximum. 
52

Table 16. Comparison of Average Typical Chlorpyrifos Use Rates to Standard Modeling Rates; Average typical use rate data are

based on five years of data as provided by BEAD and is reported as an average value.

7

Crop Scenario

Single Application 

Rate

(lb a.i./a)

Number of 

Applications per 

Year

Chlorpyrifos-oxon

1-in-10 Year 

Peak (μg/L)

1-in-10 Year 

Annual Average

(μg/L)

30 Year Average

(μg/L)

Apples

Label Rate 2.0 2.0 39.0 4.32 1.24

Typical Rate 1.5 1.2 38.34 3.99 2.50

Cherries Label Rate 1.5 8 108.58 17.35 10.55

Typical Rate 1.5 1.1 21.96 3.85 2.15

Citrus (lemons) Label Rate 2/3.5 and 3/1 5 86.57 11.16 7.37

Typical Rate 3.5 1 28.04 4.02 2.76

Citrus (oranges) Label Rate 2/3.5 and 3/1 5 86.57 11.16 7.37

Typical Rate 2.5 1.4 42.44 6.02 4.16

Corn Label Rate 1.0 3 29.49 4.39 2.98

Typical Rate 0.9 1 4.19 0.78 0.48

Grape Label Rate 1/33.3 or 1/6.0 1 107.05 14.06 9.38

Typical Rate12.2 1.2 2.76 0.41 0.25

Pecan Label Rate 1/ 4.0 and 3/2.0 4 110.20 14.99 8.41

Typical Rate 0.9 2.2 28.19 1.34 2.23

Sugar Beets Label Rate 1.0 3 10.06 1.07 0.65

Typical Rate 0.8 1.2 14.36 4.30 1.85

For modeling purposes if the average application number is not equal to an integer the next highest integer was assumed. 

1. Value is provided for all grapes (i.e., raisin, table and wine). Typical single application rate for table grapes is 2.7 lb a.i./a.
53

For grape, the typical single use rate is less than the maximum use rate provided on the labels; 

however, the number of typical applications is greater. This is attributed to a California special 

local need (Sec. 24c) label. A few other typical chlorpyrifos use rates are provided in Table 16

as supplemental information. In order to do a thorough comparison of the label maximum 

application rates and typical use rates, further analysis of the typical use rates, including the 

average upper bound application rates, is required. 

In addition to exploring the impact that various application rate scenarios have on the EDWCs 

for chlorpyrifos or chlorpyrifos-oxon, the effect of water chemistry on the degradation of 

chlorpyrifos was also examined. Laboratory studies indicate that chlorpyrifos is more susceptible 

to hydrolysis under alkaline conditions. Figure 10 highlights the pH dependence of chlorpyrifos 

hydrolysis. If the pH in the environment is greater than 7 (pH assumed in PRXM-EXAMS 

modeling) the half-life used could overestimate the EDWCs. According to USGS water quality 

data, the pH of surface waters in the U.S. ranges from 4.9-9.2, with a median value of 8.0. A 

literature study concluded the half-life of chlorpyrifos at pH 8 and 9 to be 71 and 39 days, 

respectively.

3

The guideline study submitted to the Agency estimates the hydrolysis half-life to 

be 16 days at pH 9 (MRID 00155577). Additional modeling indicates only a small reduction

(<10%) in the EDWCs when the hydrolysis half-life at pH is taken into consideration (39 or 16 

days for the literature study and guideline study, respectively). Modeling was not completed for 

pH 8 (median value) as the reduction would be smaller. 

pH

0 2 4 6 8 10 12 14 16

Half-life (days)

0

20

40

60

80

100

Chlorpyrifos

Figure 10. Hydrolysis of Chlorpyrifos as a Function of pH; Results are based on the 

hydrolysis rate constants reported in a drinking water purification simulation experiment and not 

on the submitted guideline study.

Time series data resulting from the PRZM-EXAMS model run for grape (6 lbs a.i./a trunk 

drench) are shown in Figures 11 and 12. The time series data show that peak detections are not 

frequent (sometimes >1 per year) and reinforces the notion that unless monitoring studies are 

designed to target chlorpyrifos, it is unlikely that peak concentrations will be observed. The time 
54

series data for several chlorpyrifos use scenarios were evaluated that also indicate the potentially 

sporadic nature of the chlorpyrifos or chlorpyrifos-oxon peak concentrations in surface water.

1/1/1960 1/1/1970 1/1/1980 1/1/1990 

μg/L (ppb)

0

20

40

60

80

100

120

Figure 11. Times Series Data for Estimated Drinking Water Concentrations of 

Chlorpyrifos-oxon Over 30 Years 

Jan May Sep Jan 

μg/L (ppb)

0

20

40

60

80

100

120

Figure 12. Times Series Data for Estimated Drinking Water Concentrations of 

Chlorpyrifos-oxon Over 1 Year (1980) 

Monitoring Data

This assessment also takes into account non-targeted water monitoring data from the USGS 

National Water-Quality Assessment Program (NAWQA), USEPA/USGS Pilot Reservoir 

Monitoring Program, USDA Pesticide Data Program (PDP), California Department of Pesticide 

Regulation (CDPR), and National Center for Water Quality Research (NCWQR) at Heidelberg 

College. Analytical methods used in these monitoring programs are suitable for differentiating

between chlorpyrifos and chlorpyrifos-oxon. The available monitoring data were evaluated for 

this preliminary assessment in reference to acute exposure. Further analysis is needed in order to 

determine if the data are representative of the potential chronic exposure resulting from currently 

registered uses of chlorpyrifos. The results of the monitoring data analysis are provided below by 

individual program and the data are provided in Appendix C unless otherwise noted. 
55

USGS NAWQA

The NAWQA is a national-scale assessment program that contains monitoring data for pesticides 

in streams and ground water. The database includes an extensive amount of data and contains 

data for both chlorpyrifos and chlorpyrifos-oxon; however, the NAWQA monitoring program 

was not designed to specifically target chlorpyrifos use. Specifically, the sample timing and 

frequency were not designed to correspond with chlorpyrifos applications. The monitoring sites 

were not selected based on known chlorpyrifos treatment areas, although there are some 

sampling locations in high chlorpyrifos use areas. In general, sample frequencies are sporadic 

and range from once per year to a couple times per month depending on the site and year. For 

these reasons, the data included in the NAWQA dataset are expected to underestimate 

chlorpyrifos and chlorpyrifos-oxon concentrations. The magnitude of this underestimation is 

unknown. NAWQA monitoring data from 1991 to 2010 were evaluated for this assessment and 

the results are summarized below.

Groundwater

The peak detection of chlorpyrifos in groundwater is reported as <0.5 μg/L, while the 

maximum qualified detection of chlorpyrifos is 0.07 μg/L detected at a cropland location 

in Miller, Georgia (2002). Detection frequencies of chlorpyrifos in groundwater are 

0.42% nationwide. The range of LODs for chlorpyrifos is 0.004 – 0.5 μg/L. 

The peak chlorpyrifos-oxon concentration reported for groundwater is 0.06 μg/L. This 

detection was made in an agricultural area in Colbert, Alabama in 2009. Qualified 

detections of chlorpyrifos-oxon in groundwater are very low (<1%). The range of LODs 

for chlorpyrifos-oxon is 0.06-0.5 μg/L. 

NAWQA data for chlorpyrifos and chlorpyrifos-oxon in groundwater are highlighted in 

Table 17. 

Table 17. USGS NAWQA Groundwater Monitoring Data for Chlorpyrifos and 

Chlorpyrifos-oxon.

Parameter Chlorpyrifos Chlorpyrifos-oxon

Sampling Years 1992-2010 2005-2010

Number of Samples 11592 3519

Qualified Detections 44 3

Frequency of Detections 0.42% <1%

Maximum Detection

0.0707 μg/L

2002

Miller, MS (cropland)

0.0553 μg/L

2009

Colbert, TN (agriculture)

HUC-8 Subbasins Reporting Detections 10 of 18 3 of 18

Surface Water

The highest detected concentration of chlorpyrifos in surface water is 0.57μg/L. This 

peak concentration was observed in 2003 at an urban location in Las Vegas, Nevada. 
56

Chlorpyrifos detection frequencies in surface water are 14.76% nationwide. The range of 

LODs for chlorpyrifos is 0.004 – 0.5 μg/L. 

Although the peak detection for chlorpyrifos-oxon in surface water reported as <0.34 

μg/L for a mixed use area in Maryland in 2008, the maximum qualified (actual or 

estimated) detection of chlorpyrifos-oxon is 0.04 μg/L. This detection was made in 2008 

at a Mississippi crop land location. Chlorpyrifos-oxon detection frequency is 0.33% 

nationwide. The range of LODs for chlorpyrifos-oxon is 0.013 - 0.33 μg/L. 

NAWQA data for chlorpyrifos and chlorpyrifos-oxon in surface water are highlighted in 

Table 18. 

Table 18. USGS NAWQA Surface Water Monitoring Data for Chlorpyrifos and 

Chlorpyrifos-oxon.

Parameter Chlorpyrifos Chlorpyrifos-oxon

Sampling Years 1991-2010 1999-2010

Number of Samples 28020 5693

Sample Frequency varied varied

Qualified Detections 4132 19

Frequency of Detections 14.75% 0.33%

Maximum Detection

0.57 μg/L

2003

Las Vegas, NV (urban)

0.0543 μg/L

2008

Washington, MS (cropland)

LOD 0.004 – 0.5 μg/L 0.013 - 0.33 μg/L

HUC-8 Subbasins Reporting Detections 18 of 18 7 of 18

USGS-EPA Pilot Reservoir Monitoring Program

The USGS pilot reservoir monitoring program was designed to examine pesticide concentrations 

in twelve water-supply reservoirs and subsequent Community Water Systems (CWS). The 

reservoirs sampled ranged in size from 120 to 92,600 acre-foot normal capacity within

watersheds ranging from about 3 to 785 square miles. The sites were located in California, 

Indiana, Louisiana, Missouri, New York, North Carolina, Ohio, Oklahoma, Pennsylvania, South 

Carolina, South Dakota, and Texas. Samples were collected from the raw-water intake and the 

finished-water tap located at the entry point to the distribution system. The correlation between 

raw and finished water detections are not adequate as finished water sampling generally occurred 

before raw water sampling. Each site generally was sampled every quarter, with biweekly

sample collection during a four-month period coinciding with intensive pesticide applications.

The program took place during 1999 and 2000. While sample timing and frequency were 

designed to target pesticide usage, the program was not specifically designed to correspond with 

chlorpyrifos applications. The monitoring sites were also not selected based on known 

chlorpyrifos treatment areas, but rather areas where pesticides are generally applied and runoff is 

likely. For these reasons, the data included in the USGS-EPA Pilot program are expected to 

underestimate chlorpyrifos and chlorpyrifos-oxon concentrations in drinking water. The 

magnitude of this underestimation is unknown. 
57

The highest concentration of chlorpyrifos detected is 0.0341 μg/L (6.5%). This was observed for 

intake water. There are 21 reported detections of chlorpyrifos, all of which were observed before

treatment. The LOD for chlorpyrifos is 0.004 μg/L. The peak detection for chlorpyrifos-oxon is 

reported as <0.016 μg/L—the LOD for chlorpyrifos-oxon is 0.016 μg/L. This is higher than the

detection limit for chlorpyrifos. All less than values are reported for intake water. No detections 

of chlorpyrifos or chlorpyrifos-oxon are reported in finished water. The findings are summarized 

in Table 19. 

Table 19. USGS-EPA Pilot Reservoir Monitoring Program Data for Chlorpyrifos and 

Chlorpyrifos-oxon.

Parameter Chlorpyrifos Chlorpyrifos-oxon

Sampling Years 1999-2000 1999-2000

Number of Samples 323 --

Sample Frequency bimonthly bimonthly

Qualified Detections 21 0

Frequency of Detections 6.5% 0%

Maximum Detection 0.0341 μg/L < LOD

LOD 0.004 0.016

USDA Pesticide Data Program

The USDA Pesticide Data Program (PDP) Water Monitoring Survey is designed to collect 

monitoring data on pesticide residues in drinking water. Samples from raw intake water (source 

water) as well as finished drinking water are analyzed as part of the PDP, typically on a 

bimonthly basis. PDP began testing for pesticide residues in drinking water in 2001 and 

continues today. Samples have been collected from 82 locations in 28 states and the District of 

Columbia to date; however, only a subset of these sampling locations is sampled each year. 

Currently five sites are being sampled. The program has tested for both chlorpyrifos and 

chlorpyrifos-oxon. While both chlorpyrifos and chlorpyrifos-oxon are monitored for as part of 

the PDP, the program was not designed to specifically target chlorpyrifos—the sample timing 

and frequency were not designed to correspond with chlorpyrifos applications. Although there 

are some sampling locations in chlorpyrifos use areas, the monitoring sites were not selected 

based on known chlorpyrifos use areas. For these reasons, the data included in the PDP program 

are expected to underestimate chlorpyrifos and chlorpyrifos-oxon concentrations. The magnitude 

of this underestimation is unknown. The range of LODs for chlorpyrifos and chlorpyrifos-oxon 

are 0.006 – 0.027 and 0.012 – 0.510 μg/L, respectively. PDP does not report any detections of 

chlorpyrifos or chlorpyrifos-oxon. Intake and finished drinking water were analyzed separately

and the results are summarized in Table 20. 
58

Table 20. USDA Pesticide Data Program Monitoring Data for Chlorpyrifos and 

Chlorpyrifos-oxon

Parameter Chlorpyrifos Chlorpyrifos-oxon

Source Raw Intake 

Water

Finished Drinking 

Water

Raw Intake 

Water

Finished Drinking 

Water

Sampling Years 2004-2009 2001-2009 2004-2007 2001-2007

Number of Samples 1178 2918 470 1492

Sample Frequency bimonthly bimonthly bimonthly bimonthly

Qualified Detections 0 0 0 0

Frequency of Detections 0 0 0 0

Maximum Detection na na na na

LOD 0.006 – 0.027 μg/L 0.006 – 0.027 μg/L 0.059 – 0.510 μg/L 0.012 – 0.510 μg/L

California Department of Pesticide Regulation 

The California Department of Pesticide Regulation (CDPR) maintains a Surface Water Database 

of pesticide detections in surface waters (large and small water bodies) for the entire state. In 

general, sample frequencies are sporadic and range from once per year to twice per month 

depending on the site and year. This database only contains data for chlorpyrifos. The sampling 

frequency and timing represented in the dataset do not specifically target chlorpyrifos

applications; however, there are some sampling sites located within areas known to have high 

chlorpyrifos use. Because the sampling was not designed to monitor for chlorpyrifos, it is 

expected that the CDPR data underestimate chlorpyrifos concentrations. The magnitude of this 

underestimation is unknown. The Agency accessed the CDPR database and extracted the 

chlorpyrifos-specific results as part of a recent ecological assessment.

23 This included data from 

1992 through June 2008. A summary of the data is provided here (not in Appendix C). All the 

data are provided in the aforementioned ecological assessment. 

The maximum detection was 3.96 μg/L in 2003 from a sample taken from Quail Creek in 

Monterey County. Overall, 10 samples had concentrations greater than 1 μg/L; however, 

most of these samples were collected prior to 2000. Only three of the samples greater 

than 1 μg/L were collected post 2000, with most of the highest detections occurring in 

Monterey and Stanislaus counties. The samples with the highest concentrations typically 

occur in the spring and summer. CDPR data for chlorpyrifos in surface water are 

highlighted in Table 21. 

 

23 Risks of Chlorpyrifos Use to Federally Threatened & Endangered California red-legged frog, California tiger 

salamander, San Francisco garter snake, California clapper rail, Salt marsh harvest mouse, Bay checkerspot 

butterfly, Valley elderberry longhorn beetle, San Joaquin kit fox, California freshwater shrimp, and Delta smelt; 

U.S. Environmental Protection Agency: Washington, DC, 2009 
59

Table 21. CDPR Surface Water Monitoring Data for Chlorpyrifos 

Parameter Chlorpyrifos

Sampling Years 1991-2005

Number of Samples 7400

Sample Frequency varied

Qualified Detections 1857

Frequency of Detections 25.1%

Maximum Detection

3.96 μg/L

2003

Monterey County, CA

Quail Creek (ID # 7929) 

LOD

National Center for Water Quality Research at Heidelberg College

Recently EFED acquired chlorpyrifos monitoring data from National Center for Water Quality 

Research (NCWQR) at Heidelberg College. This dataset contains an extensive amount of surface 

water monitoring data from the Sandusky and Maumee Rivers in Ohio from 1983-1999. The 

Sandusky River is located in northern Ohio and drains into Lake Erie. Its watershed is contained 

within the Ohio boarder. The Maumee River has a larger watershed that includes several 

tributaries that extend into Indiana and Michigan. These monitoring sites were not selected based 

on known chlorpyrifos use, but are located in an agricultural area known to grow corn. The data 

currently available to EFED from this monitoring program were collected prior to the mitigation 

measures that were instituted in the RED. The application rates for corn used at the time the 

monitoring samples were collected is currently unknown, therefore it is not certain what use 

pattern and application rates the monitoring results represent. In general, sample frequencies 

ranged from daily to monthly. Sampling was much more frequent during the spring and summer 

months. These monitoring data have not gone through rigorous review, but are provided in Table 

22 as supplemental information. A full evaluation of the data will be completed for the final risk 

assessment. As shown in Figure 13, the NCWQR dataset underscores the need for monitoring 

programs to have frequent sampling in order to capture peak chlorpyrifos concentrations. These

data also correspond well with the modeling time series data that suggest sporadic peaks. The 

peak concentration of 24 μg/L observed in the Maumee River (1992) is also similar to the 1-in10 year peak concentration (30 μg/L) estimated for the modeled corn scenario. Additional 

analysis of this monitoring data is required in order to determine if the results represent currently 

registered uses of chlorpyrifos. At this time, the use of this monitoring data in quantitative risk 

assessment is not recommended, as the data have not been rigorously reviewed and it is unclear 

what chlorpyrifos use pattern is represented by the results.
60

Table 22. NCWQR Surface Water Monitoring Data for Chlorpyrifos. 

Parameter Chlorpyrifos

Source Sandusky River Maumee River

Sampling Years 1983-1999 1983-1999

Number of Samples 1595 1435

Qualified Detections 147 100

Frequency of Detections 9.2% 7%

Maximum Detection 10.9 μg/L

1992

24.0 μg/L

1992

1/1/1990 1/1/2000 

μg/L (ppb)

0

5

10

15

20

25

30

1/1/1980 12/1/1991 4/1/1992 8/1/1992 12/1/1992 

μg/L (ppb)

0

5

10

15

20

25

30

Figure 13. Chlorpyrifos Monitoring Data from National Center for Water Quality 

Research (NCWQR) at Heidelberg College from 1983-1999 (left) and 1992 only (right);

Monitoring data have not been thoroughly review and is provided as supplemental data

Monitoring Data Conclusions

The reported chlorpyrifos and chlorpyrifos-oxon concentrations observed in monitoring studies 

are generally less than estimated concentrations derived from modeling. This result is attributed 

to the fact that water monitoring sampling programs do not specifically target chlorpyrifos use 

areas and may not represent high use areas; therefore, peak concentrations of chlorpyrifos and 

chlorpyrifos-oxon may go undetected. Moreover, sampling frequencies are generally not 

designed to capture peak concentrations. Furthermore, pest pressures change from year to year,

resulting in changes to chlorpyrifos use patterns, which makes it difficult to determine sampling 

timing. These challenges make it problematic to predict when peak concentrations of 

chlorpyrifos may occur. These variables underscore the need for frequent sampling in order to 

detect peak concentrations of chlorpyrifos for use in exposure assessments. The NCWQR and 

model time series data support the need for frequent sampling. Therefore, the sporadic 

monitoring data presented above is not an appropriate estimation of the potential exposure to 

chlorpyrifos or chlorpyrifos-oxon resulting from chlorpyrifos use and at this time, without a 

thorough review of the NCWQR monitoring data, is not recommended for quantitative use. 

Therefore, EFED does not recommend that chlorpyrifos or chlorpyrifos-oxon water monitoring 

data be used by HED in the human health risk assessment. 
61

In order to use monitoring data as an exposure endpoint for a chemical with an acute exposure 

concern like chlorpyrifos, sampling needs to be intensive (likely daily) in order to capture the 

peak exposure concentrations. This is based on time series data from the chlorpyrifos model runs 

as well as recommendations from the FIFRA Scientific Advisory Panel on atrazine drinking 

water monitoring frequency24, and is supported by the NCWQR monitoring data. For example, 

the SAP stated that ―if one wants 4-day rolling averages, then sampling must occur at least twice 

within the 4-day period. Simulations, models or any other approach that suggests otherwise are 

making some strong assumptions about what happens at the finer time scale.‖ 

Drinking Water Treatment

The potential impact of chlorpyrifos and chlorpyrifos-oxon concentrations on community 

drinking water supplies was analyzed by overlaying the chlorpyrifos use map shown in Figure 2

with community watershed surface water intakes. The composite map shown in Figure 14

underscores the potential impact of chlorpyrifos use on community drinking water supplies. 

There are several community watershed surface water intakes present in very high chlorpyrifos 

use regions. 

Figure 14. Co-occurrence of Chlorpyrifos Use and Community Watershed Surface Water 

Intakes; 2006-2008 Chlorpyrifos Use Spatial Distribution; BEAD agricultural chemical use 

data for chlorpyrifos9

In general, surface water treatment systems consist of pre-settling, coagulation/flocculation 

(sediment removal), granular filtration (sediment removal), corrosion control (pH adjustment or 

addition of corrosion inhibitors), and disinfection.25,26,27 It is important to note that there are 

 

24 Re-evaluation of the Human Health Effects of Atrazine: Review of Experimental Animal and Invitro Studies and 

Drinking Water Monitroing Frequency, FIFRA Scientific Advisory Panel Meeting, Sept 29, 2000; SAP Report No. 

2010-04 April 26-29, 2010 .http://www.epa.gov/scipoly/sap/meetings/2010/april/042610minutes.pdf

25 M. Montgomery Consulting Engineers, Inc., Water Treatment: Design and Design; John Wiley & Sons: New 

York, 1985. 
62

many variations on this common sequence with regards to points of addition of a wide variety of 

chemicals [e.g., chlorine, ammonia, ozone, coagulants, filter aids, powder activated carbon

(PAC), etc.]. The pre-settling process is a preliminary removal of materials, including noncolloidal sediment, from the raw water. The water is then treated with alum and polymers to 

encourage flocculation of the colloidal materials, including suspended sediment, and then 

allowed to settle. Next, the water is passed through a granular filter comprised of sand and 

possibly anthracite. After filtering, the water is conditioned to prevent corrosion and then 

disinfected using either chlorine or chloramines. A modification to the typical treatment process 

is the use of granular activated carbon (GAC) or PAC for the control of odors and taste in the 

finished water. This modification is applied through the filtration process either through the 

formation of a filtration bed using GAC or through the addition of PAC prior to coagulation 

/flocculation and filtration. The use of GAC has been shown to work well for removing 

pesticides; however, it is not a commonly used practice throughout the United States (<5%).

28

Available data from the 2006 community water system survey shows that chlorination is the 

predominate disinfection process used in drinking water treatment in the United States as shown 

in Figure 15.

29

0

1 0

2 0

3 0

4 0

5 0

6 0

7 0

8 0

9 0

100

Pecentage of CWS Performing 

Each Treament

Population Served

Chlorine

Chlorine dioxide

Chloramines Only

Chloramine with Free Chlorine

Chloramines with Seasonal 

Free chlorine

Ozone

Ultaviolet Light

Mixed Oxidant

Figure 15. Types of Disinfection Processes Among Surface Source Water Community 

Water Systems 

The time that source water is stored in a drinking water treatment facility could lead to additional 

degradation of chlorpyrifos or chlorpyrifos-oxon not taken into account in modeling. The 

 

26 Faust, S.D.; Aly, O.M. Chemistry of Water Treatment 2nd Edition; Lewis Publishers: Boca Raton, FL, 1999. 

27 Technologies for Upgrading Existing or Designing New Drinking Water Treatment Facilities. U.S. 

Environmental Protection Agency, 1989. EPA/625/4-89/023

28Community Water System Survey 1995; U.S. Environmental Protection Agency, Washington, DC 20460

29 Community Water System Survey 2006; U.S. Environmental Protection Agency, Washington, DC 20460
63

average flow-through times at several drinking water treatment facilities that participated in the 

USGS-EPA Pilot Reservoir Monitoring Program range from 0.5 to 23 hours and the pH range 

from 6.9-9.2.

30 Based on laboratory data, substantial degradation of chlorpyrifos (hydrolysis t1/2

= 39 days at pH 9) or chlorpyrifos-oxon (hydrolysis t1/2 = 6 days at pH 9) is not expected under 

these conditions.

The use of multiple sources of water within a CWS could potentially lead to dilution of 

chlorpyrifos or chlorpyrifos-oxon in drinking water; however, this is difficult to predict as the 

amount of dilution is unknown. A CWS that pulls from two different surface water sources 

within the same watershed would be modeled the same way and would result in the same 

EDWCs. It is plausible, however, that the peak chlorpyrifos concentrations could enter the CWS 

at different times, resulting in a reduction of chlorpyrifos concentrations. For CWS that utilize 

both surface water and groundwater, the reported EDWCs may over estimate exposure as the 

concentrations in groundwater is expected to be low. Therefore, when surface water that contains 

chlorpyrifos is mixed with groundwater that has little to no chlorpyrifos, dilution would occur. 

The extent of this dilution is unknown. The degree to which CWS use multiple water sources to 

supply drinking water has not been investigated to date; however, it is not expected that all CWS 

use multiple sources. Therefore, use of a dilution factor is not recommended as it is not 

representative of CWS on a national basis. 

Based on the information provided above, as well as the demonstrated formation and stability of 

chlorpyrifos-oxon during drinking water treatment3, chlorpyrifos-oxon is expected to form 

during drinking water treatment and persist through distribution. Although there is monitoring 

data from USGS-EPA Pilot Reservoir Monitoring Program and USDA Pesticide Data Program 

that sampled both raw and finished drinking water, based on the deficiencies of the individual 

programs as discussed in the previous section of this document, EFED cautions against relying 

on these monitoring programs to predict potential exposure to chlorpyrifos-oxon. In addition, 

EFED is unaware of any monitoring data for chlorpyrifos or chlorpyrifos-oxon at the point of 

consumption (i.e., consumer tap water). Data on the removal efficiency of chlorpyrifos and 

chlorpyrifos-oxon during drinking water treatment is also not currently available. Both targeting 

monitoring and removal efficiency data would help EFED further refine the final drinking water 

assessment. 

 

30 Pesticides in Selected Water-Supply Reservoirs and Finished Drinking Water, 1999-2000: Summary of Results 

from a Pilot Monitoring Program. U.S. Department of the Interior, Baltimore, MD.
64

APPENDIX A

PRZM-EXAMS Output Files 

Only the output files for select scenarios are provided below. Primarily maximum application 

rate scenarios.

TX Alfalfa

stored as TXalfalfa.out

Chemical: Chlorpyrifos

PRZM environment: TXalfalfaOP.txt modified Thuday, 14 June 2007 at 11:23:54

EXAMS environment: ir298.exv modified Thuday, 29 August 2002 at 16:34:12

Metfile: w13958.dvf modified Wedday, 3 July 2002 at 10:06:24

Water segment concentrations (ppb)

Year Peak 96 hr 21 Day 60 Day 90 Day Yearly

1961 47.85 40.63 24.97 18.42 13.82 4.456

1962 21.27 18.1 11.36 6.859 5.609 3.047

1963 3.292 2.871 2.342 1.846 1.625 0.9498

1964 50.74 42.95 24.48 11.73 8.6 3.594

1965 15.52 13.23 8.21 5.012 4.364 2.592

1966 16.15 14.47 9.55 5.703 4.284 1.958

1967 8.333 7.589 5.008 4.336 4.161 1.983

1968 13.84 11.89 7.093 4.828 4.306 2.316

1969 12.59 11.16 8.57 4.903 3.874 2.017

1970 7.512 6.527 4.721 3.041 2.281 1.444

1971 17.43 15.74 9.761 5.032 3.96 1.749

1972 9.293 7.969 4.747 3.048 2.654 1.362

1973 21.22 19.16 14.95 9.708 7.332 3.124

1974 21.81 18.62 11.05 7.195 5.465 2.872

1975 17.18 15.27 11.16 9.317 7.396 3.327

1976 12.61 10.89 9.12 5.51 4.567 2.351

1977 4.205 3.597 2.575 1.643 1.503 1.016

1978 11.54 9.862 6.199 3.745 3.427 1.697

1979 34.79 29.86 22.36 11.98 9.919 3.868

1980 5.115 4.497 2.746 1.942 1.905 1.363

1981 66.14 60.27 40.84 22.66 17.11 5.799

1982 4.683 4.076 3.359 2.784 2.273 1.161

1983 6.609 5.711 4.084 3.263 3.096 1.511

1984 9.276 8.068 6.436 3.845 3.066 1.251

1985 16.27 13.97 8.82 5.945 4.521 2.376

1986 12.7 10.96 7.459 4.588 3.847 1.918

1987 26.91 23.39 18.61 12.5 9.529 3.712

1988 5.924 5.136 4.047 2.789 2.28 1.064

1989 8.159 7.43 4.905 3.59 2.728 1.243

1990 7.831 6.784 4.17 2.779 2.428 1.452

Sorted results

Prob. Peak 96 hr 21 Day 60 Day 90 Day Yearly

0.032258064516129 66.14 60.27 40.84 22.66 17.11 5.799

0.0645161290322581 50.74 42.95 24.97 18.42 13.82 4.456

0.0967741935483871 47.85 40.63 24.48 12.5 9.919 3.868

0.129032258064516 34.79 29.86 22.36 11.98 9.529 3.712

0.161290322580645 26.91 23.39 18.61 11.73 8.6 3.594

0.193548387096774 21.81 19.16 14.95 9.708 7.396 3.327

0.225806451612903 21.27 18.62 11.36 9.317 7.332 3.124
65

0.258064516129032 21.22 18.1 11.16 7.195 5.609 3.047

0.290322580645161 17.43 15.74 11.05 6.859 5.465 2.872

0.32258064516129 17.18 15.27 9.761 5.945 4.567 2.592

0.354838709677419 16.27 14.47 9.55 5.703 4.521 2.376

0.387096774193548 16.15 13.97 9.12 5.51 4.364 2.351

0.419354838709677 15.52 13.23 8.82 5.032 4.306 2.316

0.451612903225806 13.84 11.89 8.57 5.012 4.284 2.017

0.483870967741936 12.7 11.16 8.21 4.903 4.161 1.983

0.516129032258065 12.61 10.96 7.459 4.828 3.96 1.958

0.548387096774194 12.59 10.89 7.093 4.588 3.874 1.918

0.580645161290323 11.54 9.862 6.436 4.336 3.847 1.749

0.612903225806452 9.293 8.068 6.199 3.845 3.427 1.697

0.645161290322581 9.276 7.969 5.008 3.745 3.096 1.511

0.67741935483871 8.333 7.589 4.905 3.59 3.066 1.452

0.709677419354839 8.159 7.43 4.747 3.263 2.728 1.444

0.741935483870968 7.831 6.784 4.721 3.048 2.654 1.363

0.774193548387097 7.512 6.527 4.17 3.041 2.428 1.362

0.806451612903226 6.609 5.711 4.084 2.789 2.281 1.251

0.838709677419355 5.924 5.136 4.047 2.784 2.28 1.243

0.870967741935484 5.115 4.497 3.359 2.779 2.273 1.161

0.903225806451613 4.683 4.076 2.746 1.942 1.905 1.064

0.935483870967742 4.205 3.597 2.575 1.846 1.625 1.016

0.967741935483871 3.292 2.871 2.342 1.643 1.503 0.9498

0.1 46.544 39.553 24.268 12.448 9.88 3.8524

Average of yearly averages: 2.28576

Inputs generated by pe5.pl - Novemeber 2006

Data used for this run:

Output File: TXalfalfa

Metfile: w13958.dvf

PRZM scenario: TXalfalfaOP.txt

EXAMS environment file: ir298.exv

Chemical Name: Chlorpyrifos

Description Variable Name Value Units Comments

Molecular weightmwt 350.6 g/mol

Henry's Law Const. henry 6.2e-6 atm-m^3/mol

Vapor Pressure vapr 1.87e-5 torr

Solubility sol 1.4 mg/L

Kd Kd mg/L

Koc Koc 6040 mg/L

Photolysis half-life kdp 29.6 days Half-life

Aerobic Aquatic Metabolism kbacw 91.5 days Halfife

Anaerobic Aquatic Metabolism kbacs 63 days Halfife

Aerobic Soil Metabolism asm 109 days Halfife

Hydrolysis: pH 7 81 days Half-life

Method: CAM 2 integer See PRZM manual

Incorporation Depth: DEPI 0 cm

Application Rate:TAPP 1.1 kg/ha

Application Efficiency: APPEFF0.95 fraction

Spray Drift DRFT 0.039 fraction of application rate applied to pond

Application Date Date 17-05 dd/mm or dd/mmm or dd-mm or dd-mmm

Interval 1 interval 10 days Set to 0 or delete line for single app.

app. rate 1 apprate 1.1 kg/ha

Interval 2 interval 10 days Set to 0 or delete line for single app.
66

app. rate 2 apprate 1.1 kg/ha

Interval 3 interval 10 days Set to 0 or delete line for single app.

app. rate 3 apprate 0.56 kg/ha

Record 17: FILTRA

IPSCND1

UPTKF

Record 18: PLVKRT

PLDKRT

FEXTRC 0.5

Flag for Index Res. Run IR Reservoir

Flag for runoff calc. RUNOFF total none, monthly or total(average of entire run)

CA Almond

stored as CAalmond_.out

Chemical: Chlorpyrifos

PRZM environment: CAalmond_WirrigSTD.txt modified Wedday, 13 June 2007 at 12:17:16

EXAMS environment: ir298.exv modified Thuday, 29 August 2002 at 16:34:12

Metfile: w23232.dvf modified Wedday, 3 July 2002 at 10:04:22

Water segment concentrations (ppb)

Year Peak 96 hr 21 Day 60 Day 90 Day Yearly

1961 6.567 5.661 4.754 3.864 3.391 1.932

1962 18.54 16.1 10.09 5.596 4.509 3.328

1963 19.2 16.92 12.46 9.412 7.931 4.084

1964 7.639 6.734 5.731 4.774 4.262 2.599

1965 7.386 6.519 5.255 4.162 3.759 2.193

1966 7.275 6.59 5.287 4.267 3.846 2.225

1967 9.624 8.541 7.339 5.663 5.263 2.885

1968 7.962 6.968 5.791 4.595 4.11 2.218

1969 7.722 6.751 5.611 4.497 4.09 2.43

1970 7.469 6.579 5.675 4.841 4.265 2.544

1971 7.953 7.053 5.504 4.398 3.942 2.27

1972 7.292 6.547 5.415 4.29 3.879 2.181

1973 8.491 7.4 5.971 4.79 4.349 2.481

1974 7.304 6.415 5.078 3.952 3.646 2.057

1975 9.436 8.212 6.676 4.879 4.323 2.223

1976 7.231 6.327 5.295 4.142 4.038 2.26

1977 6.93 6.059 5.242 4.445 3.799 2.281

1978 10.67 9.359 7.76 5.45 4.848 2.892

1979 7.636 6.705 5.715 4.652 4.121 2.467

1980 7.862 6.895 5.762 4.673 4.118 2.369

1981 8.506 7.476 6.052 4.654 4.098 2.38

1982 24.88 21.64 15.71 10.06 8.682 4.259

1983 14.7 12.79 9.629 6.683 6.009 2.944

1984 6.936 6.044 4.964 4.136 3.823 2.086

1985 6.904 6.05 4.991 4.016 3.655 2.064

1986 9.416 8.421 7.351 5.868 5.025 2.594

1987 10.55 9.158 7.444 5.488 4.748 2.365

1988 7.106 6.241 5.395 4.564 3.979 2.224

1989 8.619 7.499 6.42 4.86 4.229 2.27

1990 8.145 7.221 5.812 4.74 4.334 2.601

Sorted results

Prob. Peak 96 hr 21 Day 60 Day 90 Day Yearly

0.032258064516129 24.88 21.64 15.71 10.06 8.682 4.259

0.0645161290322581 19.2 16.92 12.46 9.412 7.931 4.084
67

0.0967741935483871 18.54 16.1 10.09 6.683 6.009 3.328

0.129032258064516 14.7 12.79 9.629 5.868 5.263 2.944

0.161290322580645 10.67 9.359 7.76 5.663 5.025 2.892

0.193548387096774 10.55 9.158 7.444 5.596 4.848 2.885

0.225806451612903 9.624 8.541 7.351 5.488 4.748 2.601

0.258064516129032 9.436 8.421 7.339 5.45 4.509 2.599

0.290322580645161 9.416 8.212 6.676 4.879 4.349 2.594

0.32258064516129 8.619 7.499 6.42 4.86 4.334 2.544

0.354838709677419 8.506 7.476 6.052 4.841 4.323 2.481

0.387096774193548 8.491 7.4 5.971 4.79 4.265 2.467

0.419354838709677 8.145 7.221 5.812 4.774 4.262 2.43

0.451612903225806 7.962 7.053 5.791 4.74 4.229 2.38

0.483870967741936 7.953 6.968 5.762 4.673 4.121 2.369

0.516129032258065 7.862 6.895 5.731 4.654 4.118 2.365

0.548387096774194 7.722 6.751 5.715 4.652 4.11 2.281

0.580645161290323 7.639 6.734 5.675 4.595 4.098 2.27

0.612903225806452 7.636 6.705 5.611 4.564 4.09 2.27

0.645161290322581 7.469 6.59 5.504 4.497 4.038 2.26

0.67741935483871 7.386 6.579 5.415 4.445 3.979 2.225

0.709677419354839 7.304 6.547 5.395 4.398 3.942 2.224

0.741935483870968 7.292 6.519 5.295 4.29 3.879 2.223

0.774193548387097 7.275 6.415 5.287 4.267 3.846 2.218

0.806451612903226 7.231 6.327 5.255 4.162 3.823 2.193

0.838709677419355 7.106 6.241 5.242 4.142 3.799 2.181

0.870967741935484 6.936 6.059 5.078 4.136 3.759 2.086

0.903225806451613 6.93 6.05 4.991 4.016 3.655 2.064

0.935483870967742 6.904 6.044 4.964 3.952 3.646 2.057

0.967741935483871 6.567 5.661 4.754 3.864 3.391 1.932

0.1 18.156 15.769 10.0439 6.6015 5.9344 3.2896

Average of yearly averages: 2.52353333333333

Inputs generated by pe5.pl - Novemeber 2006

Data used for this run:

Output File: CAalmond_

Metfile: w23232.dvf

PRZM scenario: CAalmond_WirrigSTD.txt

EXAMS environment file: ir298.exv

Chemical Name: Chlorpyrifos

Description Variable Name Value Units Comments

Molecular weightmwt 350.6 g/mol

Henry's Law Const. henry 6.2e-6 atm-m^3/mol

Vapor Pressure vapr 1.87e-5 torr

Solubility sol 1.4 mg/L

Kd Kd mg/L

Koc Koc 6040 mg/L

Photolysis half-life kdp 29.6 days Half-life

Aerobic Aquatic Metabolism kbacw 91.5 days Halfife

Anaerobic Aquatic Metabolism kbacs 63 days Halfife

Aerobic Soil Metabolism asm 109 days Halfife

Hydrolysis: pH 7 81 days Half-life

Method: CAM 2 integer See PRZM manual

Incorporation Depth: DEPI 0 cm

Application Rate:TAPP 1.1 kg/ha

Application Efficiency: APPEFF0.95 fraction
68

Spray Drift DRFT 0.039 fraction of application rate applied to pond

Application Date Date 1-1 dd/mm or dd/mmm or dd-mm or dd-mmm

Interval 1 interval 60 days Set to 0 or delete line for single app.

app. rate 1 apprate 4.5 kg/ha

Interval 2 interval 10 days Set to 0 or delete line for single app.

app. rate 2 apprate 2.2 kg/ha

Interval 3 interval 10 days Set to 0 or delete line for single app.

app. rate 3 apprate 2.2 kg/ha

Record 17: FILTRA

IPSCND1

UPTKF

Record 18: PLVKRT

PLDKRT

FEXTRC 0.5

Flag for Index Res. Run IR Reservoir

Flag for runoff calc. RUNOFF total none, monthly or total(average of entire run)

NC Apple

stored as NC Apples _dormant spray (2 applications).out

Chemical: Chlorpyrifos

PRZM environment: NCappleSTD.txt modified Tueday, 29 May 2007 at 13:58:16

EXAMS environment: ir298.exv modified Thuday, 29 August 2002 at 16:34:12

Metfile: w03812.dvf modified Wedday, 3 July 2002 at 10:05:50

Water segment concentrations (ppb)

Year Peak 96 hr 21 Day 60 Day 90 Day Yearly

1965 8.678 7.65 5.096 4.373 3.938 1.758

1966 32.51 29.02 19.07 11.18 8.954 3.748

1967 6.547 5.732 4.198 3.112 2.803 1.9

1968 42.18 36.22 21.63 11.21 8.666 3.577

1969 12.35 10.71 7.052 4.982 4.52 2.185

1970 1.756 1.609 1.352 1.204 1.054 0.6316

1971 6.152 5.395 4.606 3.162 3.02 1.403

1972 7.145 6.213 3.913 2.738 2.566 1.528

1973 23.61 20.98 12.99 10.24 8.954 4.331

1974 9.201 8.001 5.507 3.928 4.04 1.958

1975 20.54 18.62 12.49 7.444 6.974 3.176

1976 18.6 16.3 9.872 5.732 5.363 2.896

1977 12.53 10.86 7.97 6.281 5.019 2.366

1978 47.12 41.68 26.21 15.51 12.94 5.091

1979 31.42 27.05 16.83 13.17 11.96 4.98

1980 14.99 13.63 10.87 7.068 5.905 2.385

1981 20.54 17.76 10.95 6.393 5.137 2.447

1982 30.69 26.63 17.6 12.54 10.21 4.052

1983 21.33 18.44 12.1 8.885 7.559 2.916

1984 27.52 23.74 16.83 11.36 9.395 3.855

1985 16.24 14.09 9.482 5.821 4.625 2.088

1986 3.892 3.377 2.203 1.482 1.266 0.9399

1987 21.55 18.66 11.41 6.477 5.596 2.828

1988 14.36 12.72 8.366 4.529 3.618 1.507

1989 9.963 8.645 5.246 3.403 3.122 1.713

1990 40.32 35.42 21.46 14.28 11.25 4.334

Sorted results

Prob. Peak 96 hr 21 Day 60 Day 90 Day Yearly

0.037037037037037 47.12 41.68 26.21 15.51 12.94 5.091
69

0.0740740740740741 42.18 36.22 21.63 14.28 11.96 4.98

0.111111111111111 40.32 35.42 21.46 13.17 11.25 4.334

0.148148148148148 32.51 29.02 19.07 12.54 10.21 4.331

0.185185185185185 31.42 27.05 17.6 11.36 9.395 4.052

0.222222222222222 30.69 26.63 16.83 11.21 8.954 3.855

0.259259259259259 27.52 23.74 16.83 11.18 8.954 3.748

0.296296296296296 23.61 20.98 12.99 10.24 8.666 3.577

0.333333333333333 21.55 18.66 12.49 8.885 7.559 3.176

0.37037037037037 21.33 18.62 12.1 7.444 6.974 2.916

0.407407407407407 20.54 18.44 11.41 7.068 5.905 2.896

0.444444444444444 20.54 17.76 10.95 6.477 5.596 2.828

0.481481481481481 18.6 16.3 10.87 6.393 5.363 2.447

0.518518518518518 16.24 14.09 9.872 6.281 5.137 2.385

0.555555555555556 14.99 13.63 9.482 5.821 5.019 2.366

0.592592592592593 14.36 12.72 8.366 5.732 4.625 2.185

0.62962962962963 12.53 10.86 7.97 4.982 4.52 2.088

0.666666666666667 12.35 10.71 7.052 4.529 4.04 1.958

0.703703703703704 9.963 8.645 5.507 4.373 3.938 1.9

0.740740740740741 9.201 8.001 5.246 3.928 3.618 1.758

0.777777777777778 8.678 7.65 5.096 3.403 3.122 1.713

0.814814814814815 7.145 6.213 4.606 3.162 3.02 1.528

0.851851851851852 6.547 5.732 4.198 3.112 2.803 1.507

0.888888888888889 6.152 5.395 3.913 2.738 2.566 1.403

0.925925925925926 3.892 3.377 2.203 1.482 1.266 0.9399

0.962962962962963 1.756 1.609 1.352 1.204 1.054 0.6316

0.1 40.878 35.66 21.511 13.503 11.463 4.5278

Average of yearly averages: 2.71513461538462

Inputs generated by pe5.pl - Novemeber 2006

Data used for this run:

Output File: NC Apples _dormant spray (2 applications)

Metfile: w03812.dvf

PRZM scenario: NCappleSTD.txt

EXAMS environment file: ir298.exv

Chemical Name: Chlorpyrifos

Description Variable Name Value Units Comments

Molecular weightmwt 350.6 g/mol

Henry's Law Const. henry 6.2e-6 atm-m^3/mol

Vapor Pressure vapr 1.87e-5 torr

Solubility sol 1.4 mg/L

Kd Kd mg/L

Koc Koc 6040 mg/L

Photolysis half-life kdp 29.6 days Half-life

Aerobic Aquatic Metabolism kbacw 91.5 days Halfife

Anaerobic Aquatic Metabolism kbacs 63 days Halfife

Aerobic Soil Metabolism asm 109 days Halfife

Hydrolysis: pH 7 81 days Half-life

Method: CAM 1 integer See PRZM manual

Incorporation Depth: DEPI 0 cm

Application Rate:TAPP 2.2 kg/ha

Application Efficiency: APPEFF0.99 fraction

Spray Drift DRFT 0.01 fraction of application rate applied to pond

Application Date Date 1-1 dd/mm or dd/mmm or dd-mm or dd-mmm

Interval 1 interval 10 days Set to 0 or delete line for single app.
70

app. rate 1 apprate 2.2 kg/ha

Record 17: FILTRA

IPSCND1

UPTKF

Record 18: PLVKRT

PLDKRT

FEXTRC 0.5

Flag for Index Res. Run IR Reservoir

Flag for runoff calc. RUNOFF total none, monthly or total(average of entire run)

MI Asparagus 

stored as MIAsparagus_aerial.out

Chemical: Chlorpyrifos

PRZM environment: MIAsparagusSTDv2.txt modified Wedday, 22 October 2008 at 12:00:15

EXAMS environment: ir298.exv modified Thuday, 29 August 2002 at 16:34:12

Metfile: w14840.dvf modified Wedday, 3 July 2002 at 10:05:38

Water segment concentrations (ppb)

Year Peak 96 hr 21 Day 60 Day 90 Day Yearly

1961 3.835 3.304 2.397 1.45 1.098 0.4209

1962 3.892 3.36 2.456 1.509 1.148 0.4785

1963 4.028 3.51 2.85 1.882 1.447 0.5707

1964 3.89 3.357 2.453 1.503 1.138 0.4168

1965 7.398 6.355 3.784 1.962 1.501 0.7488

1966 4.042 3.502 2.599 1.634 1.255 0.587

1967 16.67 14.6 9.112 4.966 3.832 1.351

1968 4.06 3.522 2.62 1.654 1.273 0.5763

1969 3.904 3.363 2.46 1.505 1.145 0.4521

1970 3.868 3.332 2.428 1.483 1.123 0.4917

1971 3.91 3.375 2.471 1.519 1.154 0.4687

1972 8.139 7.059 4.383 2.915 2.32 1.017

1973 4.639 4.027 3.136 1.924 1.484 0.6666

1974 4.046 3.493 2.612 1.647 1.252 0.4586

1975 5.562 4.81 2.972 2.052 1.631 0.8616

1976 6.635 5.752 4.485 2.631 2.035 0.8065

1977 3.92 3.374 2.474 1.515 1.145 0.4543

1978 3.961 3.419 2.524 1.568 1.19 0.5142

1979 3.944 3.402 2.5 1.543 1.18 0.4714

1980 8.194 7.08 4.494 2.702 2.237 0.9745

1981 4.058 3.518 2.615 1.645 1.266 0.6911

1982 4.021 3.497 2.59 1.634 1.256 0.5778

1983 4.166 3.586 2.535 1.571 1.192 0.653

1984 5.984 5.188 3.982 2.277 1.747 0.6696

1985 3.884 3.351 2.448 1.505 1.176 0.5581

1986 15.34 13.14 7.98 4.346 3.309 1.287

1987 10.13 8.714 5.235 2.878 2.223 1.317

1988 4.085 3.537 2.638 1.664 1.277 0.759

1989 11.02 9.513 6.868 3.806 2.979 1.098

1990 3.993 3.441 2.547 1.582 1.209 0.5246

Sorted results

Prob. Peak 96 hr 21 Day 60 Day 90 Day Yearly

0.032258064516129 16.67 14.6 9.112 4.966 3.832 1.351

0.0645161290322581 15.34 13.14 7.98 4.346 3.309 1.317

0.0967741935483871 11.02 9.513 6.868 3.806 2.979 1.287

0.129032258064516 10.13 8.714 5.235 2.915 2.32 1.098
71

0.161290322580645 8.194 7.08 4.494 2.878 2.237 1.017

0.193548387096774 8.139 7.059 4.485 2.702 2.223 0.9745

0.225806451612903 7.398 6.355 4.383 2.631 2.035 0.8616

0.258064516129032 6.635 5.752 3.982 2.277 1.747 0.8065

0.290322580645161 5.984 5.188 3.784 2.052 1.631 0.759

0.32258064516129 5.562 4.81 3.136 1.962 1.501 0.7488

0.354838709677419 4.639 4.027 2.972 1.924 1.484 0.6911

0.387096774193548 4.166 3.586 2.85 1.882 1.447 0.6696

0.419354838709677 4.085 3.537 2.638 1.664 1.277 0.6666

0.451612903225806 4.06 3.522 2.62 1.654 1.273 0.653

0.483870967741936 4.058 3.518 2.615 1.647 1.266 0.587

0.516129032258065 4.046 3.51 2.612 1.645 1.256 0.5778

0.548387096774194 4.042 3.502 2.599 1.634 1.255 0.5763

0.580645161290323 4.028 3.497 2.59 1.634 1.252 0.5707

0.612903225806452 4.021 3.493 2.547 1.582 1.209 0.5581

0.645161290322581 3.993 3.441 2.535 1.571 1.192 0.5246

0.67741935483871 3.961 3.419 2.524 1.568 1.19 0.5142

0.709677419354839 3.944 3.402 2.5 1.543 1.18 0.4917

0.741935483870968 3.92 3.375 2.474 1.519 1.176 0.4785

0.774193548387097 3.91 3.374 2.471 1.515 1.154 0.4714

0.806451612903226 3.904 3.363 2.46 1.509 1.148 0.4687

0.838709677419355 3.892 3.36 2.456 1.505 1.145 0.4586

0.870967741935484 3.89 3.357 2.453 1.505 1.145 0.4543

0.903225806451613 3.884 3.351 2.448 1.503 1.138 0.4521

0.935483870967742 3.868 3.332 2.428 1.483 1.123 0.4209

0.967741935483871 3.835 3.304 2.397 1.45 1.098 0.4168

0.1 10.931 9.4331 6.7047 3.7169 2.9131 1.2681

Average of yearly averages: 0.697413333333333

Inputs generated by pe5.pl - Novemeber 2006

Data used for this run:

Output File: MIAsparagus_aerial

Metfile: w14840.dvf

PRZM scenario: MIAsparagusSTDv2.txt

EXAMS environment file: ir298.exv

Chemical Name: Chlorpyrifos

Description Variable Name Value Units Comments

Molecular weightmwt 350.6 g/mol

Henry's Law Const. henry 6.2e-6 atm-m^3/mol

Vapor Pressure vapr 1.87e-5 torr

Solubility sol 1.4 mg/L

Kd Kd mg/L

Koc Koc 6040 mg/L

Photolysis half-life kdp 29.6 days Half-life

Aerobic Aquatic Metabolism kbacw 91.5 days Halfife

Anaerobic Aquatic Metabolism kbacs 63 days Halfife

Aerobic Soil Metabolism asm 109 days Halfife

Hydrolysis: pH 7 81 days Half-life

Method: CAM 2 integer See PRZM manual

Incorporation Depth: DEPI 0 cm

Application Rate:TAPP 1.1 kg/ha

Application Efficiency: APPEFF0.95 fraction

Spray Drift DRFT 0.039 fraction of application rate applied to pond

Application Date Date 15-5 dd/mm or dd/mmm or dd-mm or dd-mmm
72

Interval 1 interval 10 days Set to 0 or delete line for single app.

app. rate 1 apprate 1.7 kg/ha

Interval 2 interval 10 days Set to 0 or delete line for single app.

app. rate 2 apprate 1.7 kg/ha

Record 17: FILTRA

IPSCND1

UPTKF

Record 18: PLVKRT

PLDKRT

FEXTRC 0.5

Flag for Index Res. Run IR Reservoir

Flag for runoff calc. RUNOFF total none, monthly or total(average of entire run)

MI Asparagus (granular)

stored as MIAsparagus_granular.out

Chemical: Chlorpyrifos

PRZM environment: MIAsparagusSTDv2.txt modified Wedday, 22 October 2008 at 12:00:15

EXAMS environment: ir298.exv modified Thuday, 29 August 2002 at 16:34:12

Metfile: w14840.dvf modified Wedday, 3 July 2002 at 10:05:38

Water segment concentrations (ppb)

Year Peak 96 hr 21 Day 60 Day 90 Day Yearly

1961 0.9173 0.7838 0.5488 0.295 0.2246 0.05958

1962 0.7434 0.6382 0.3779 0.1937 0.1484 0.07055

1963 0.9733 0.8456 0.5274 0.2929 0.256 0.1349

1964 0.08226 0.08082 0.07622 0.06958 0.06285 0.02886

1965 5.364 4.586 2.67 1.328 0.9958 0.2755

1966 0.6548 0.5595 0.3784 0.2915 0.2691 0.1552

1967 10.44 9.018 5.638 2.933 2.218 0.7305

1968 0.3701 0.3684 0.3597 0.3385 0.309 0.1453

1969 0.5553 0.4747 0.3134 0.1612 0.1216 0.04794

1970 1.183 1.058 0.6349 0.3164 0.2383 0.08358

1971 0.6348 0.5616 0.4393 0.1633 0.1124 0.06337

1972 4.637 3.998 2.421 1.29 1.178 0.4626

1973 1.47 1.283 0.8193 0.4792 0.3783 0.2448

1974 0.8282 0.7178 0.4449 0.2471 0.1922 0.08938

1975 3.936 3.381 2.028 1.153 0.8832 0.353

1976 5.211 4.509 2.741 1.47 1.127 0.4495

1977 0.1981 0.1971 0.1924 0.1806 0.1706 0.08538

1978 0.6611 0.5681 0.3387 0.2869 0.2315 0.09748

1979 0.3792 0.3322 0.2225 0.1532 0.1263 0.06255

1980 3.443 2.963 1.779 0.9324 0.9941 0.3995

1981 2.043 1.749 1.038 0.5482 0.448 0.2135

1982 1.033 0.8857 0.5243 0.2602 0.1838 0.129

1983 2.865 2.447 1.422 0.7194 0.5545 0.1932

1984 3.442 3.005 1.864 0.9957 0.7619 0.3023

1985 1.313 1.129 0.669 0.3785 0.3135 0.1482

1986 11.21 9.585 5.762 3.085 2.328 0.6798

1987 7.127 6.106 3.598 1.914 1.457 0.6852

1988 2.695 2.303 1.346 0.6877 0.5288 0.2884

1989 11.02 9.496 5.756 3.023 2.34 0.8013

1990 0.5287 0.4543 0.3158 0.2907 0.2706 0.1585

Sorted results

Prob. Peak 96 hr 21 Day 60 Day 90 Day Yearly

0.032258064516129 11.21 9.585 5.762 3.085 2.34 0.8013
73

0.0645161290322581 11.02 9.496 5.756 3.023 2.328 0.7305

0.0967741935483871 10.44 9.018 5.638 2.933 2.218 0.6852

0.129032258064516 7.127 6.106 3.598 1.914 1.457 0.6798

0.161290322580645 5.364 4.586 2.741 1.47 1.178 0.4626

0.193548387096774 5.211 4.509 2.67 1.328 1.127 0.4495

0.225806451612903 4.637 3.998 2.421 1.29 0.9958 0.3995

0.258064516129032 3.936 3.381 2.028 1.153 0.9941 0.353

0.290322580645161 3.443 3.005 1.864 0.9957 0.8832 0.3023

0.32258064516129 3.442 2.963 1.779 0.9324 0.7619 0.2884

0.354838709677419 2.865 2.447 1.422 0.7194 0.5545 0.2755

0.387096774193548 2.695 2.303 1.346 0.6877 0.5288 0.2448

0.419354838709677 2.043 1.749 1.038 0.5482 0.448 0.2135

0.451612903225806 1.47 1.283 0.8193 0.4792 0.3783 0.1932

0.483870967741936 1.313 1.129 0.669 0.3785 0.3135 0.1585

0.516129032258065 1.183 1.058 0.6349 0.3385 0.309 0.1552

0.548387096774194 1.033 0.8857 0.5488 0.3164 0.2706 0.1482

0.580645161290323 0.9733 0.8456 0.5274 0.295 0.2691 0.1453

0.612903225806452 0.9173 0.7838 0.5243 0.2929 0.256 0.1349

0.645161290322581 0.8282 0.7178 0.4449 0.2915 0.2383 0.129

0.67741935483871 0.7434 0.6382 0.4393 0.2907 0.2315 0.09748

0.709677419354839 0.6611 0.5681 0.3784 0.2869 0.2246 0.08938

0.741935483870968 0.6548 0.5616 0.3779 0.2602 0.1922 0.08538

0.774193548387097 0.6348 0.5595 0.3597 0.2471 0.1838 0.08358

0.806451612903226 0.5553 0.4747 0.3387 0.1937 0.1706 0.07055

0.838709677419355 0.5287 0.4543 0.3158 0.1806 0.1484 0.06337

0.870967741935484 0.3792 0.3684 0.3134 0.1633 0.1263 0.06255

0.903225806451613 0.3701 0.3322 0.2225 0.1612 0.1216 0.05958

0.935483870967742 0.1981 0.1971 0.1924 0.1532 0.1124 0.04794

0.967741935483871 0.08226 0.08082 0.07622 0.06958 0.06285 0.02886

0.1 10.1087 8.7268 5.434 2.8311 2.1419 0.68466

Average of yearly averages: 0.254629

Inputs generated by pe5.pl - Novemeber 2006

Data used for this run:

Output File: MIAsparagus_granular

Metfile: w14840.dvf

PRZM scenario: MIAsparagusSTDv2.txt

EXAMS environment file: ir298.exv

Chemical Name: Chlorpyrifos

Description Variable Name Value Units Comments

Molecular weightmwt 350.6 g/mol

Henry's Law Const. henry 6.2e-6 atm-m^3/mol

Vapor Pressure vapr 1.87e-5 torr

Solubility sol 1.4 mg/L

Kd Kd mg/L

Koc Koc 6040 mg/L

Photolysis half-life kdp 29.6 days Half-life

Aerobic Aquatic Metabolism kbacw 91.5 days Halfife

Anaerobic Aquatic Metabolism kbacs 63 days Halfife

Aerobic Soil Metabolism asm 109 days Halfife

Hydrolysis: pH 7 81 days Half-life

Method: CAM 1 integer See PRZM manual

Incorporation Depth: DEPI 0 cm

Application Rate:TAPP 1.7 kg/ha
74

Application Efficiency: APPEFF1 fraction

Spray Drift DRFT 0 fraction of application rate applied to pond

Application Date Date 15-5 dd/mm or dd/mmm or dd-mm or dd-mmm

Interval 1 interval 10 days Set to 0 or delete line for single app.

app. rate 1 apprate 1.7 kg/ha

Record 17: FILTRA

IPSCND1

UPTKF

Record 18: PLVKRT

PLDKRT

FEXTRC 0.5

Flag for Index Res. Run IR Reservoir

Flag for runoff calc. RUNOFF total none, monthly or total(average of entire run)

MI Cherries

stored as MI Cherries-8x.out

Chemical: Chlorpyrifos

PRZM environment: MICherriesSTD.txt modified Tueday, 29 May 2007 at 13:56:56

EXAMS environment: ir298.exv modified Thuday, 29 August 2002 at 16:34:12

Metfile: w14850.dvf modified Wedday, 3 July 2002 at 10:05:40

Water segment concentrations (ppb)

Year Peak 96 hr 21 Day 60 Day 90 Day Yearly

1961 89.17 77.48 51.5 30.21 24.34 7.397

1962 40.62 35.88 25.14 16.28 14.16 9.263

1963 5.073 4.949 4.823 4.52 4.345 3.05

1964 46.32 40.87 26.24 17.14 14.15 5.517

1965 38.63 34.52 27.85 19.13 16.73 8.051

1966 31.03 27.5 18.54 12.95 11.36 7.791

1967 15.39 13.82 10.07 7.957 7.165 6.242

1968 17.88 15.84 10.94 8.065 6.948 4.644

1969 79.12 69.74 52.6 42.82 36.98 15.95

1970 65.02 57.76 39.52 33.36 27.55 13.83

1971 59.65 52.45 34.34 20.58 16.7 11.37

1972 82.52 72.34 51.33 33.39 29.37 14.57

1973 20.6 18.32 13.55 12.6 11.64 8.297

1974 29.43 25.99 17.57 14.26 13.32 6.994

1975 103 96.05 75.05 44.74 35.73 12.96

1976 41.28 36.45 24.23 14.9 13.45 9.834

1977 36.63 32.55 22.32 17.55 14.9 7.847

1978 67.43 59.1 39.48 25.09 20.61 9.527

1979 89.59 78.58 50.93 29.97 24.44 13.11

1980 19.43 17.45 12.82 10.1 9.572 7.248

1981 73.37 66.18 46 28.11 24.56 11.92

1982 119 107 69 39.91 31.86 15.26

1983 53.32 47.63 32.99 26.5 25.82 14.21

1984 64.74 57.01 37.73 23.46 20.38 11.78

1985 115 101 64.69 49.36 42.24 18.43

1986 87.96 78.28 65.17 50.64 45.55 25.07

1987 118 104 77.64 52.8 43.47 22.02

1988 18.72 18.59 18.05 16.87 16.03 9.766

1989 55.74 49.35 33.31 21.22 17.41 7.968

1990 46.42 41.44 34.3 23.5 24.19 11.93

Sorted results

Prob. Peak 96 hr 21 Day 60 Day 90 Day Yearly
75

0.032258064516129 119 107 77.64 52.8 45.55 25.07

0.0645161290322581 118 104 75.05 50.64 43.47 22.02

0.0967741935483871 115 101 69 49.36 42.24 18.43

0.129032258064516 103 96.05 65.17 44.74 36.98 15.95

0.161290322580645 89.59 78.58 64.69 42.82 35.73 15.26

0.193548387096774 89.17 78.28 52.6 39.91 31.86 14.57

0.225806451612903 87.96 77.48 51.5 33.39 29.37 14.21

0.258064516129032 82.52 72.34 51.33 33.36 27.55 13.83

0.290322580645161 79.12 69.74 50.93 30.21 25.82 13.11

0.32258064516129 73.37 66.18 46 29.97 24.56 12.96

0.354838709677419 67.43 59.1 39.52 28.11 24.44 11.93

0.387096774193548 65.02 57.76 39.48 26.5 24.34 11.92

0.419354838709677 64.74 57.01 37.73 25.09 24.19 11.78

0.451612903225806 59.65 52.45 34.34 23.5 20.61 11.37

0.483870967741936 55.74 49.35 34.3 23.46 20.38 9.834

0.516129032258065 53.32 47.63 33.31 21.22 17.41 9.766

0.548387096774194 46.42 41.44 32.99 20.58 16.73 9.527

0.580645161290323 46.32 40.87 27.85 19.13 16.7 9.263

0.612903225806452 41.28 36.45 26.24 17.55 16.03 8.297

0.645161290322581 40.62 35.88 25.14 17.14 14.9 8.051

0.67741935483871 38.63 34.52 24.23 16.87 14.16 7.968

0.709677419354839 36.63 32.55 22.32 16.28 14.15 7.847

0.741935483870968 31.03 27.5 18.54 14.9 13.45 7.791

0.774193548387097 29.43 25.99 18.05 14.26 13.32 7.397

0.806451612903226 20.6 18.59 17.57 12.95 11.64 7.248

0.838709677419355 19.43 18.32 13.55 12.6 11.36 6.994

0.870967741935484 18.72 17.45 12.82 10.1 9.572 6.242

0.903225806451613 17.88 15.84 10.94 8.065 7.165 5.517

0.935483870967742 15.39 13.82 10.07 7.957 6.948 4.644

0.967741935483871 5.073 4.949 4.823 4.52 4.345 3.05

0.1 113.8 100.505 68.617 48.898 41.714 18.182

Average of yearly averages: 11.0615333333333

Inputs generated by pe5.pl - Novemeber 2006

Data used for this run:

Output File: MI Cherries-8x

Metfile: w14850.dvf

PRZM scenario: MICherriesSTD.txt

EXAMS environment file: ir298.exv

Chemical Name: Chlorpyrifos

Description Variable Name Value Units Comments

Molecular weightmwt 350.6 g/mol

Henry's Law Const. henry 6.2e-6 atm-m^3/mol

Vapor Pressure vapr 1.87e-5 torr

Solubility sol 1.4 mg/L

Kd Kd mg/L

Koc Koc 6040 mg/L

Photolysis half-life kdp 29.6 days Half-life

Aerobic Aquatic Metabolism kbacw 91.5 days Halfife

Anaerobic Aquatic Metabolism kbacs 63 days Halfife

Aerobic Soil Metabolism asm 109 days Halfife

Hydrolysis: pH 7 81 days Half-life

Method: CAM 2 integer See PRZM manual

Incorporation Depth: DEPI 0 cm
76

Application Rate:TAPP 1.7 kg/ha

Application Efficiency: APPEFF0.99 fraction

Spray Drift DRFT 0.01 fraction of application rate applied to pond

Application Date Date 15-05 dd/mm or dd/mmm or dd-mm or dd-mmm

Interval 1 interval 10 days Set to 0 or delete line for single app.

app. rate 1 apprate 1.7 kg/ha

Interval 2 interval 10 days Set to 0 or delete line for single app.

app. rate 2 apprate 1.7 kg/ha

Interval 3 interval 10 days Set to 0 or delete line for single app.

app. rate 3 apprate 1.7 kg/ha

Interval 4 interval 10 days Set to 0 or delete line for single app.

app. rate 4 apprate 1.7 kg/ha

Interval 5 interval 10 days Set to 0 or delete line for single app.

app. rate 5 apprate 1.7 kg/ha

Interval 6 interval 10 days Set to 0 or delete line for single app.

app. rate 6 apprate 1.7 kg/ha

Interval 7 interval 10 days Set to 0 or delete line for single app.

app. rate 7 apprate 1.7 kg/ha

Record 17: FILTRA

IPSCND1

UPTKF

Record 18: PLVKRT

PLDKRT

FEXTRC 0.5

Flag for Index Res. Run IR Reservoir

Flag for runoff calc. RUNOFF total none, monthly or total(average of entire run)

PA Christmas Trees

stored as PA Xmas trees.out

Chemical: Chlorpyrifos

PRZM environment: PAappleSTD_V2.txt modified Tueday, 20 May 2008 at 13:00:22

EXAMS environment: ir298.exv modified Thuday, 29 August 2002 at 16:34:12

Metfile: w14751.dvf modified Wedday, 3 July 2002 at 10:06:14

Water segment concentrations (ppb)

Year Peak 96 hr 21 Day 60 Day 90 Day Yearly

1961 19.11 17 10.58 5.735 4.531 1.364

1962 10.17 8.928 5.803 4.087 3.673 2.071

1963 5.548 4.83 3.264 2.725 2.212 1.488

1964 4.932 4.31 2.753 2.131 1.908 1.28

1965 4.989 4.357 2.782 2.056 1.817 1.147

1966 33.39 28.93 18.01 10.17 8.232 2.812

1967 6.199 5.593 4.368 3.507 3.43 2.232

1968 32.39 28.13 17.43 9.668 7.79 2.679

1969 3.904 3.518 3.29 2.94 2.696 1.705

1970 2.44 2.201 1.751 1.463 1.366 0.9645

1971 12.29 10.68 7.097 5.856 4.709 1.996

1972 7.034 6.214 4.986 3.599 2.822 2.136

1973 29.46 25.6 15.98 9.12 7.293 2.883

1974 19.2 17.03 12.01 7.095 5.796 3.193

1975 50.65 43.86 27.68 15.29 11.95 4.243

1976 20.27 17.68 11.54 7.286 6.085 3.591

1977 3.672 3.429 3.234 3.048 3.063 1.891

1978 2.656 2.427 1.852 1.691 1.638 1.092

1979 14.09 12.39 8.915 6.737 5.458 2.374

1980 6.932 6.063 4.026 2.849 2.138 1.462
77

1981 3.748 3.379 2.583 1.996 1.825 1.187

1982 2.09 1.869 1.411 1.071 0.9494 0.7886

1983 7.205 6.424 4.52 2.551 2.04 0.9792

1984 3.242 3.008 2.374 1.928 1.769 1.192

1985 9.827 8.549 5.363 3.342 2.951 1.213

1986 8.216 7.29 5.39 3.119 2.46 1.585

1987 16.32 14.37 11.03 6.776 5.857 2.353

1988 3.454 3.041 2.963 2.822 2.605 1.507

1989 14.41 12.54 7.83 4.689 4.478 1.789

1990 15.18 13.27 8.52 5.019 4.715 2.342

Sorted results

Prob. Peak 96 hr 21 Day 60 Day 90 Day Yearly

0.032258064516129 50.65 43.86 27.68 15.29 11.95 4.243

0.0645161290322581 33.39 28.93 18.01 10.17 8.232 3.591

0.0967741935483871 32.39 28.13 17.43 9.668 7.79 3.193

0.129032258064516 29.46 25.6 15.98 9.12 7.293 2.883

0.161290322580645 20.27 17.68 12.01 7.286 6.085 2.812

0.193548387096774 19.2 17.03 11.54 7.095 5.857 2.679

0.225806451612903 19.11 17 11.03 6.776 5.796 2.374

0.258064516129032 16.32 14.37 10.58 6.737 5.458 2.353

0.290322580645161 15.18 13.27 8.915 5.856 4.715 2.342

0.32258064516129 14.41 12.54 8.52 5.735 4.709 2.232

0.354838709677419 14.09 12.39 7.83 5.019 4.531 2.136

0.387096774193548 12.29 10.68 7.097 4.689 4.478 2.071

0.419354838709677 10.17 8.928 5.803 4.087 3.673 1.996

0.451612903225806 9.827 8.549 5.39 3.599 3.43 1.891

0.483870967741936 8.216 7.29 5.363 3.507 3.063 1.789

0.516129032258065 7.205 6.424 4.986 3.342 2.951 1.705

0.548387096774194 7.034 6.214 4.52 3.119 2.822 1.585

0.580645161290323 6.932 6.063 4.368 3.048 2.696 1.507

0.612903225806452 6.199 5.593 4.026 2.94 2.605 1.488

0.645161290322581 5.548 4.83 3.29 2.849 2.46 1.462

0.67741935483871 4.989 4.357 3.264 2.822 2.212 1.364

0.709677419354839 4.932 4.31 3.234 2.725 2.138 1.28

0.741935483870968 3.904 3.518 2.963 2.551 2.04 1.213

0.774193548387097 3.748 3.429 2.782 2.131 1.908 1.192

0.806451612903226 3.672 3.379 2.753 2.056 1.825 1.187

0.838709677419355 3.454 3.041 2.583 1.996 1.817 1.147

0.870967741935484 3.242 3.008 2.374 1.928 1.769 1.092

0.903225806451613 2.656 2.427 1.852 1.691 1.638 0.9792

0.935483870967742 2.44 2.201 1.751 1.463 1.366 0.9645

0.967741935483871 2.09 1.869 1.411 1.071 0.9494 0.7886

0.1 32.097 27.877 17.285 9.6132 7.7403 3.162

Average of yearly averages: 1.91797666666667

Inputs generated by pe5.pl - Novemeber 2006

Data used for this run:

Output File: PA Xmas trees

Metfile: w14751.dvf

PRZM scenario: PAappleSTD_V2.txt

EXAMS environment file: ir298.exv

Chemical Name: Chlorpyrifos

Description Variable Name Value Units Comments
78

Molecular weightmwt 350.6 g/mol

Henry's Law Const. henry 6.2e-6 atm-m^3/mol

Vapor Pressure vapr 1.87e-5 torr

Solubility sol 1.4 mg/L

Kd Kd mg/L

Koc Koc 6040 mg/L

Photolysis half-life kdp 29.6 days Half-life

Aerobic Aquatic Metabolism kbacw 91.5 days Halfife

Anaerobic Aquatic Metabolism kbacs 63 days Halfife

Aerobic Soil Metabolism asm 109 days Halfife

Hydrolysis: pH 7 81 days Half-life

Method: CAM 2 integer See PRZM manual

Incorporation Depth: DEPI 0 cm

Application Rate:TAPP 1.1 kg/ha

Application Efficiency: APPEFF0.99 fraction

Spray Drift DRFT 0.01 fraction of application rate applied to pond

Application Date Date 01-08 dd/mm or dd/mmm or dd-mm or dd-mmm

Interval 1 interval 7 days Set to 0 or delete line for single app.

app. rate 1 apprate 1.1 kg/ha

Interval 2 interval 7 days Set to 0 or delete line for single app.

app. rate 2 apprate 1.1 kg/ha

Record 17: FILTRA

IPSCND1

UPTKF

Record 18: PLVKRT

PLDKRT

FEXTRC 0.5

Flag for Index Res. Run IR Reservoir

Flag for runoff calc. RUNOFF total none, monthly or total(average of entire run)

OR Christmas Trees

stored as OR Xmas trees.out

Chemical: Chlorpyrifos

PRZM environment: ORXmasTreeSTD.txt modified Tueday, 21 February 2006 at 15:39:00

EXAMS environment: ir298.exv modified Thuday, 29 August 2002 at 16:34:12

Metfile: w24232.dvf modified Wedday, 3 July 2002 at 10:06:10

Water segment concentrations (ppb)

Year Peak 96 hr 21 Day 60 Day 90 Day Yearly

1961 1.394 1.208 0.6089 0.3346 0.2746 0.1165

1962 2.954 2.55 1.596 0.8747 0.7447 0.3656

1963 1.916 1.671 1.124 0.7956 0.6147 0.4916

1964 5.252 4.674 2.263 1.081 0.7735 0.4922

1965 2.643 2.337 1.612 1.38 1.138 0.644

1966 2.729 2.453 1.705 1.008 0.9086 0.5701

1967 2.04 1.796 1.186 0.7371 0.6318 0.4396

1968 2.553 2.305 1.664 1.13 1.133 0.6593

1969 2.674 2.343 1.56 1.259 0.9717 0.6056

1970 2.463 1.503 1.128 1.05 0.93 0.5602

1971 2.484 2.158 1.342 0.8447 0.7599 0.545

1972 3.047 2.654 1.676 1.037 0.8496 0.4993

1973 4.502 3.882 2.576 1.761 1.226 0.5513

1974 3.096 2.848 1.963 1.335 1.133 0.6884

1975 1.496 1.315 0.885 0.6451 0.5563 0.4179

1976 0.8881 0.8305 0.624 0.4778 0.4565 0.2825

1977 2.383 2.125 1.497 0.9589 0.6931 0.2618
79

1978 1.257 1.118 0.8734 0.6393 0.5486 0.3728

1979 2.377 2.065 1.278 0.7885 0.6982 0.3869

1980 4.635 4.06 2.502 1.566 1.095 0.5409

1981 3.04 2.678 2.026 1.619 1.535 0.8785

1982 1.883 1.653 1.248 0.9573 0.8664 0.5774

1983 1.189 1.08 0.842 0.7103 0.6613 0.4868

1984 3.242 2.806 1.911 1.43 1.054 0.4915

1985 1.297 1.134 0.7262 0.5574 0.5076 0.3821

1986 1.326 1.154 0.8687 0.4694 0.3537 0.278

1987 5.085 4.44 3.492 1.538 1.068 0.4857

1988 2.236 2.002 1.607 1.144 0.9689 0.5775

1989 4.457 3.885 2.425 1.196 0.8937 0.4437

1990 1.762 1.605 1.154 0.9973 0.846 0.5406

Sorted results

Prob. Peak 96 hr 21 Day 60 Day 90 Day Yearly

0.032258064516129 5.252 4.674 3.492 1.761 1.535 0.8785

0.0645161290322581 5.085 4.44 2.576 1.619 1.226 0.6884

0.0967741935483871 4.635 4.06 2.502 1.566 1.138 0.6593

0.129032258064516 4.502 3.885 2.425 1.538 1.133 0.644

0.161290322580645 4.457 3.882 2.263 1.43 1.133 0.6056

0.193548387096774 3.242 2.848 2.026 1.38 1.095 0.5775

0.225806451612903 3.096 2.806 1.963 1.335 1.068 0.5774

0.258064516129032 3.047 2.678 1.911 1.259 1.054 0.5701

0.290322580645161 3.04 2.654 1.705 1.196 0.9717 0.5602

0.32258064516129 2.954 2.55 1.676 1.144 0.9689 0.5513

0.354838709677419 2.729 2.453 1.664 1.13 0.93 0.545

0.387096774193548 2.674 2.343 1.612 1.081 0.9086 0.5409

0.419354838709677 2.643 2.337 1.607 1.05 0.8937 0.5406

0.451612903225806 2.553 2.305 1.596 1.037 0.8664 0.4993

0.483870967741936 2.484 2.158 1.56 1.008 0.8496 0.4922

0.516129032258065 2.463 2.125 1.497 0.9973 0.846 0.4916

0.548387096774194 2.383 2.065 1.342 0.9589 0.7735 0.4915

0.580645161290323 2.377 2.002 1.278 0.9573 0.7599 0.4868

0.612903225806452 2.236 1.796 1.248 0.8747 0.7447 0.4857

0.645161290322581 2.04 1.671 1.186 0.8447 0.6982 0.4437

0.67741935483871 1.916 1.653 1.154 0.7956 0.6931 0.4396

0.709677419354839 1.883 1.605 1.128 0.7885 0.6613 0.4179

0.741935483870968 1.762 1.503 1.124 0.7371 0.6318 0.3869

0.774193548387097 1.496 1.315 0.885 0.7103 0.6147 0.3821

0.806451612903226 1.394 1.208 0.8734 0.6451 0.5563 0.3728

0.838709677419355 1.326 1.154 0.8687 0.6393 0.5486 0.3656

0.870967741935484 1.297 1.134 0.842 0.5574 0.5076 0.2825

0.903225806451613 1.257 1.118 0.7262 0.4778 0.4565 0.278

0.935483870967742 1.189 1.08 0.624 0.4694 0.3537 0.2618

0.967741935483871 0.8881 0.8305 0.6089 0.3346 0.2746 0.1165

0.1 4.6217 4.0425 2.4943 1.5632 1.1375 0.65777

Average of yearly averages: 0.487776666666667

Inputs generated by pe5.pl - Novemeber 2006

Data used for this run:

Output File: OR Xmas trees

Metfile: w24232.dvf

PRZM scenario: ORXmasTreeSTD.txt
80

EXAMS environment file: ir298.exv

Chemical Name: Chlorpyrifos

Description Variable Name Value Units Comments

Molecular weightmwt 350.6 g/mol

Henry's Law Const. henry 6.2e-6 atm-m^3/mol

Vapor Pressure vapr 1.87e-5 torr

Solubility sol 1.4 mg/L

Kd Kd mg/L

Koc Koc 6040 mg/L

Photolysis half-life kdp 29.6 days Half-life

Aerobic Aquatic Metabolism kbacw 91.5 days Halfife

Anaerobic Aquatic Metabolism kbacs 63 days Halfife

Aerobic Soil Metabolism asm 109 days Halfife

Hydrolysis: pH 7 81 days Half-life

Method: CAM 2 integer See PRZM manual

Incorporation Depth: DEPI 0 cm

Application Rate:TAPP 1.1 kg/ha

Application Efficiency: APPEFF0.99 fraction

Spray Drift DRFT 0.01 fraction of application rate applied to pond

Application Date Date 01-08 dd/mm or dd/mmm or dd-mm or dd-mmm

Interval 1 interval 7 days Set to 0 or delete line for single app.

app. rate 1 apprate 1.1 kg/ha

Interval 2 interval 7 days Set to 0 or delete line for single app.

app. rate 2 apprate 1.1 kg/ha

Record 17: FILTRA

IPSCND1

UPTKF

Record 18: PLVKRT

PLDKRT

FEXTRC 0.5

Flag for Index Res. Run IR Reservoir

Flag for runoff calc. RUNOFF total none, monthly or total(average of entire run)

FL Citrus

stored as FLcitrus_ground.out

Chemical: Chlorpyrifos

PRZM environment: FLcitrusSTD.txt modified Tueday, 29 May 2007 at 13:45:56

EXAMS environment: ir298.exv modified Thuday, 29 August 2002 at 16:34:12

Metfile: w12844.dvf modified Wedday, 3 July 2002 at 10:04:30

Water segment concentrations (ppb)

Year Peak 96 hr 21 Day 60 Day 90 Day Yearly

1961 13.79 11.91 9.526 5.843 5.15 1.677

1962 39.61 36.42 24.33 13.34 10.4 4.211

1963 91.15 80.38 55.09 31.54 25.17 8.183

1964 96.49 87.37 60.5 40.41 35.1 14.02

1965 128 110 82.57 51.88 38.27 13.19

1966 33.83 29.76 19.74 15.18 13.85 9.45

1967 57.54 50.08 32.64 22.7 18.04 7.375

1968 84.69 74.32 54.53 35.03 27.3 11.45

1969 49.13 43.44 31.05 26.88 22.71 10.27

1970 16.84 15.32 12.37 9.463 9.707 5.837

1971 61.51 52.99 33.69 17.93 14.4 5.235

1972 63.86 55.14 33.35 17.24 12.64 6.918

1973 24.47 23.08 16.05 12.66 10.36 5.018

1974 57.86 49.64 32.28 18.48 14.86 6.598
81

1975 63.85 55.35 37.84 21.95 17.08 6.081

1976 35.07 31.74 21.05 16 14.39 6.54

1977 39.99 35.08 24.96 15.66 13.2 7.302

1978 58.17 53.7 37.89 22.33 18.95 7.775

1979 79.78 68.62 50.68 32.05 24.79 10.05

1980 20.09 17.4 12.67 9.782 8.309 5.797

1981 46.03 42.11 28.58 22.59 20.84 7.872

1982 73.45 64.45 50.45 29.8 24.45 11.73

1983 53.05 45.74 28.5 22.92 18.58 10.25

1984 87.04 77.76 48.7 26.51 21.57 9.841

1985 29.11 25.14 19.16 11.66 8.861 6.09

1986 36.11 31.46 20.26 16.59 13.79 6.188

1987 59.46 51.53 37.18 30.37 25.17 9.618

1988 56.45 48.79 29.68 18.49 16.19 7.892

1989 13.5 11.7 9.023 5.854 4.7 2.939

1990 59.1 51.06 37.67 21.72 17.3 6.247

Sorted results

Prob. Peak 96 hr 21 Day 60 Day 90 Day Yearly

0.032258064516129 128 110 82.57 51.88 38.27 14.02

0.0645161290322581 96.49 87.37 60.5 40.41 35.1 13.19

0.0967741935483871 91.15 80.38 55.09 35.03 27.3 11.73

0.129032258064516 87.04 77.76 54.53 32.05 25.17 11.45

0.161290322580645 84.69 74.32 50.68 31.54 25.17 10.27

0.193548387096774 79.78 68.62 50.45 30.37 24.79 10.25

0.225806451612903 73.45 64.45 48.7 29.8 24.45 10.05

0.258064516129032 63.86 55.35 37.89 26.88 22.71 9.841

0.290322580645161 63.85 55.14 37.84 26.51 21.57 9.618

0.32258064516129 61.51 53.7 37.67 22.92 20.84 9.45

0.354838709677419 59.46 52.99 37.18 22.7 18.95 8.183

0.387096774193548 59.1 51.53 33.69 22.59 18.58 7.892

0.419354838709677 58.17 51.06 33.35 22.33 18.04 7.872

0.451612903225806 57.86 50.08 32.64 21.95 17.3 7.775

0.483870967741936 57.54 49.64 32.28 21.72 17.08 7.375

0.516129032258065 56.45 48.79 31.05 18.49 16.19 7.302

0.548387096774194 53.05 45.74 29.68 18.48 14.86 6.918

0.580645161290323 49.13 43.44 28.58 17.93 14.4 6.598

0.612903225806452 46.03 42.11 28.5 17.24 14.39 6.54

0.645161290322581 39.99 36.42 24.96 16.59 13.85 6.247

0.67741935483871 39.61 35.08 24.33 16 13.79 6.188

0.709677419354839 36.11 31.74 21.05 15.66 13.2 6.09

0.741935483870968 35.07 31.46 20.26 15.18 12.64 6.081

0.774193548387097 33.83 29.76 19.74 13.34 10.4 5.837

0.806451612903226 29.11 25.14 19.16 12.66 10.36 5.797

0.838709677419355 24.47 23.08 16.05 11.66 9.707 5.235

0.870967741935484 20.09 17.4 12.67 9.782 8.861 5.018

0.903225806451613 16.84 15.32 12.37 9.463 8.309 4.211

0.935483870967742 13.79 11.91 9.526 5.854 5.15 2.939

0.967741935483871 13.5 11.7 9.023 5.843 4.7 1.677

0.1 90.739 80.118 55.034 34.732 27.087 11.702

Average of yearly averages: 7.72146666666667

Inputs generated by pe5.pl - Novemeber 2006

Data used for this run:
82

Output File: FLcitrus_ground

Metfile: w12844.dvf

PRZM scenario: FLcitrusSTD.txt

EXAMS environment file: ir298.exv

Chemical Name: Chlorpyrifos

Description Variable Name Value Units Comments

Molecular weightmwt 350.6 g/mol

Henry's Law Const. henry 4.2e-6 atm-m^3/mol

Vapor Pressure vapr 1.82-5 torr

Solubility sol 2 mg/L

Kd Kd mg/L

Koc Koc 6040 mg/L

Photolysis half-life kdp 29.6 days Half-life

Aerobic Aquatic Metabolism kbacw 91.5 days Halfife

Anaerobic Aquatic Metabolism kbacs 63 days Halfife

Aerobic Soil Metabolism asm 109 days Halfife

Hydrolysis: pH 7 81 days Half-life

Method: CAM 2 integer See PRZM manual

Incorporation Depth: DEPI 0 cm

Application Rate:TAPP 3.9 kg/ha

Application Efficiency: APPEFF0.99 fraction

Spray Drift DRFT 0.01 fraction of application rate applied to pond

Application Date Date 10-8 dd/mm or dd/mmm or dd-mm or dd-mmm

Interval 1 interval 30 days Set to 0 or delete line for single app.

app. rate 1 apprate 3.9 kg/ha

Interval 2 interval 10 days Set to 0 or delete line for single app.

app. rate 2 apprate 1.1 kg/ha

Interval 3 interval 10 days Set to 0 or delete line for single app.

app. rate 3 apprate 1.1 kg/ha

Interval 4 interval 10 days Set to 0 or delete line for single app.

app. rate 4 apprate 1.1 kg/ha

Record 17: FILTRA

IPSCND1

UPTKF

Record 18: PLVKRT

PLDKRT

FEXTRC 0.5

Flag for Index Res. Run IR Reservoir

Flag for runoff calc. RUNOFF total none, monthly or total(average of entire run)

FL Cabbage

stored as FLCabbage_air.out

Chemical: Chlorpyrifos

PRZM environment: FLcabbageSTD.txt modified Thuday, 24 May 2007 at 10:40:46

EXAMS environment: ir298.exv modified Thuday, 29 August 2002 at 16:34:12

Metfile: w12842.dvf modified Wedday, 3 July 2002 at 10:04:28

Water segment concentrations (ppb)

Year Peak 96 hr 21 Day 60 Day 90 Day Yearly

1961 9.841 8.484 6.204 4.822 3.895 2.283

1962 38.45 33.17 20.2 16.21 12.45 5.67

1963 20.17 17.58 11.43 9.013 7.938 5.434

1964 34.52 30.64 24.95 20.19 17.29 9.5

1965 23.89 20.49 15.02 11.76 11.35 6.074

1966 26.57 24.45 15.07 10.33 9.477 5.201

1967 37.87 33.38 24.11 15.15 12.81 5.775
83

1968 24.43 22.04 16.62 11.87 12.05 6.403

1969 28.13 24.24 17.55 14.74 13.33 8.411

1970 15.54 13.76 11.15 8.101 6.478 5.112

1971 51.49 46.18 30.16 19.55 17.06 8.641

1972 32.88 28.35 22.9 13.74 12.13 6.638

1973 25.93 22.4 17.75 13.54 10.92 5.429

1974 61.44 52.51 31.62 17.17 14.75 5.891

1975 28.32 24.6 19.26 14.85 12.62 6.646

1976 46.7 40.97 26.24 18.12 14.62 7.047

1977 13.63 11.89 9.814 7.596 6.525 3.444

1978 16.93 15.01 10.09 6.486 5.813 4.617

1979 114 100 63.22 33.63 26.13 13.81

1980 16.41 14.3 12.13 9.572 8.739 5.537

1981 30.94 26.88 18.36 15.29 11.76 7.183

1982 35.17 30.86 22.59 19.24 17.12 9.71

1983 31.07 26.82 18.94 13.79 12.86 8.137

1984 18.73 16.14 11.44 8.888 7.792 4.776

1985 66.97 58.6 35.97 20.98 17.25 7.841

1986 18.69 16.38 10.72 7.614 7.163 5.245

1987 28.74 24.92 16.1 11.73 10.61 7.273

1988 69.63 59.79 40.25 25.71 20.01 8.818

1989 28.81 25.1 20.36 13.97 12.37 6.329

1990 22.87 19.76 14.12 9.449 7.974 4.701

Sorted results

Prob. Peak 96 hr 21 Day 60 Day 90 Day Yearly

0.032258064516129 114 100 63.22 33.63 26.13 13.81

0.0645161290322581 69.63 59.79 40.25 25.71 20.01 9.71

0.0967741935483871 66.97 58.6 35.97 20.98 17.29 9.5

0.129032258064516 61.44 52.51 31.62 20.19 17.25 8.818

0.161290322580645 51.49 46.18 30.16 19.55 17.12 8.641

0.193548387096774 46.7 40.97 26.24 19.24 17.06 8.411

0.225806451612903 38.45 33.38 24.95 18.12 14.75 8.137

0.258064516129032 37.87 33.17 24.11 17.17 14.62 7.841

0.290322580645161 35.17 30.86 22.9 16.21 13.33 7.273

0.32258064516129 34.52 30.64 22.59 15.29 12.86 7.183

0.354838709677419 32.88 28.35 20.36 15.15 12.81 7.047

0.387096774193548 31.07 26.88 20.2 14.85 12.62 6.646

0.419354838709677 30.94 26.82 19.26 14.74 12.45 6.638

0.451612903225806 28.81 25.1 18.94 13.97 12.37 6.403

0.483870967741936 28.74 24.92 18.36 13.79 12.13 6.329

0.516129032258065 28.32 24.6 17.75 13.74 12.05 6.074

0.548387096774194 28.13 24.45 17.55 13.54 11.76 5.891

0.580645161290323 26.57 24.24 16.62 11.87 11.35 5.775

0.612903225806452 25.93 22.4 16.1 11.76 10.92 5.67

0.645161290322581 24.43 22.04 15.07 11.73 10.61 5.537

0.67741935483871 23.89 20.49 15.02 10.33 9.477 5.434

0.709677419354839 22.87 19.76 14.12 9.572 8.739 5.429

0.741935483870968 20.17 17.58 12.13 9.449 7.974 5.245

0.774193548387097 18.73 16.38 11.44 9.013 7.938 5.201

0.806451612903226 18.69 16.14 11.43 8.888 7.792 5.112

0.838709677419355 16.93 15.01 11.15 8.101 7.163 4.776

0.870967741935484 16.41 14.3 10.72 7.614 6.525 4.701

0.903225806451613 15.54 13.76 10.09 7.596 6.478 4.617

0.935483870967742 13.63 11.89 9.814 6.486 5.813 3.444

0.967741935483871 9.841 8.484 6.204 4.822 3.895 2.283
84

0.1 66.417 57.991 35.535 20.901 17.286 9.4318

Average of yearly averages: 6.58586666666667

Inputs generated by pe5.pl - Novemeber 2006

Data used for this run:

Output File: FLCabbage_air

Metfile: w12842.dvf

PRZM scenario: FLcabbageSTD.txt

EXAMS environment file: ir298.exv

Chemical Name: Chlorpyrifos

Description Variable Name Value Units Comments

Molecular weightmwt 350.6 g/mol

Henry's Law Const. henry 6.7e-6 atm-m^3/mol

Vapor Pressure vapr 2.02e-5 torr

Solubility sol 1.4 mg/L

Kd Kd mg/L

Koc Koc 6040 mg/L

Photolysis half-life kdp 29.6 days Half-life

Aerobic Aquatic Metabolism kbacw 91.5 days Halfife

Anaerobic Aquatic Metabolism kbacs 63 days Halfife

Aerobic Soil Metabolism asm 109 days Halfife

Hydrolysis: pH 7 81 days Half-life

Method: CAM 1 integer See PRZM manual

Incorporation Depth: DEPI 0 cm

Application Rate:TAPP 1.1 kg/ha

Application Efficiency: APPEFF0.95 fraction

Spray Drift DRFT 0.039 fraction of application rate applied to pond

Application Date Date 1-1 dd/mm or dd/mmm or dd-mm or dd-mmm

Interval 1 interval 10 days Set to 0 or delete line for single app.

app. rate 1 apprate 1.1 kg/ha

Interval 2 interval 10 days Set to 0 or delete line for single app.

app. rate 2 apprate 1.1 kg/ha

Interval 3 interval 90 days Set to 0 or delete line for single app.

app. rate 3 apprate 1.1 kg/ha

Interval 4 interval 10 days Set to 0 or delete line for single app.

app. rate 4 apprate 1.1 kg/ha

Interval 5 interval 10 days Set to 0 or delete line for single app.

app. rate 5 apprate 1.1 kg/ha

Interval 6 interval 90 days Set to 0 or delete line for single app.

app. rate 6 apprate 1.1 kg/ha

Interval 7 interval 10 days Set to 0 or delete line for single app.

app. rate 7 apprate 1.1 kg/ha

Interval 8 interval 10 days Set to 0 or delete line for single app.

app. rate 8 apprate 1.1 kg/ha

Record 17: FILTRA

IPSCND1

UPTKF

Record 18: PLVKRT

PLDKRT

FEXTRC 0.5

Flag for Index Res. Run IR Reservoir

Flag for runoff calc. RUNOFF total none, monthly or total(average of entire run)

KS Corn
85

stored as KScorn_aerial.out

Chemical: Chlorpyrifos

PRZM environment: KSCornStd.txt modified Monday, 25 August 2008 at 15:45:08

EXAMS environment: ir298.exv modified Thuday, 29 August 2002 at 16:34:12

Metfile: w13996.dvf modified Wedday, 3 July 2002 at 10:04:44

Water segment concentrations (ppb)

Year Peak 96 hr 21 Day 60 Day 90 Day Yearly

1961 11.58 10.04 7.046 4.596 4.183 2.007

1962 17.5 14.97 10.3 7.403 6.66 3.356

1963 10.02 8.658 5.322 3.474 3.17 1.64

1964 19 16.48 12.79 7.671 6.868 3.259

1965 15.86 14.45 10.92 9.128 7.359 3.67

1966 27.34 24.13 15.76 9.278 7.458 3.01

1967 41.82 37.31 27.8 17.54 13.9 5.448

1968 22.3 19.46 16.34 10.48 9.072 4.448

1969 17.77 15.84 14.33 8.917 7.125 3.338

1970 15.09 13.16 9.721 6.019 4.711 2.391

1971 6.727 5.868 3.958 3.099 2.603 1.581

1972 8.942 7.802 4.995 3.703 3.517 2.006

1973 26.42 22.87 14.75 9.081 9.267 5.075

1974 16.01 14.03 9.008 5.83 5.068 3.261

1975 14.01 12.85 8.623 5.463 4.298 2.357

1976 4.907 4.33 3.495 2.544 2.321 1.265

1977 37.34 32.33 21.72 12.61 10.94 4.623

1978 19.57 17.79 12.76 9.175 7.798 3.978

1979 15.32 13.33 10.88 7.216 6.588 3.353

1980 13.79 12 9.09 5.113 4.746 2.961

1981 17.92 15.72 12.27 10.69 9.377 4.33

1982 15.51 13.57 10.13 7.873 6.777 3.336

1983 9.469 8.667 5.659 4.147 3.455 2.044

1984 31.3 26.98 18.97 11.39 9.012 3.589

1985 14.36 13.14 9.125 6.344 6.243 3.444

1986 10.23 9.097 6.253 4.913 4.437 2.885

1987 10.12 8.901 7.089 5.909 4.994 2.676

1988 11 9.893 6.949 4.097 3.602 1.749

1989 19.96 17.59 11.88 7.722 7.162 3.399

1990 12.23 10.69 7.637 6.053 5.893 3.224

Sorted results

Prob. Peak 96 hr 21 Day 60 Day 90 Day Yearly

0.032258064516129 41.82 37.31 27.8 17.54 13.9 5.448

0.0645161290322581 37.34 32.33 21.72 12.61 10.94 5.075

0.0967741935483871 31.3 26.98 18.97 11.39 9.377 4.623

0.129032258064516 27.34 24.13 16.34 10.69 9.267 4.448

0.161290322580645 26.42 22.87 15.76 10.48 9.072 4.33

0.193548387096774 22.3 19.46 14.75 9.278 9.012 3.978

0.225806451612903 19.96 17.79 14.33 9.175 7.798 3.67

0.258064516129032 19.57 17.59 12.79 9.128 7.458 3.589

0.290322580645161 19 16.48 12.76 9.081 7.359 3.444

0.32258064516129 17.92 15.84 12.27 8.917 7.162 3.399

0.354838709677419 17.77 15.72 11.88 7.873 7.125 3.356

0.387096774193548 17.5 14.97 10.92 7.722 6.868 3.353

0.419354838709677 16.01 14.45 10.88 7.671 6.777 3.338

0.451612903225806 15.86 14.03 10.3 7.403 6.66 3.336

0.483870967741936 15.51 13.57 10.13 7.216 6.588 3.261
86

0.516129032258065 15.32 13.33 9.721 6.344 6.243 3.259

0.548387096774194 15.09 13.16 9.125 6.053 5.893 3.224

0.580645161290323 14.36 13.14 9.09 6.019 5.068 3.01

0.612903225806452 14.01 12.85 9.008 5.909 4.994 2.961

0.645161290322581 13.79 12 8.623 5.83 4.746 2.885

0.67741935483871 12.23 10.69 7.637 5.463 4.711 2.676

0.709677419354839 11.58 10.04 7.089 5.113 4.437 2.391

0.741935483870968 11 9.893 7.046 4.913 4.298 2.357

0.774193548387097 10.23 9.097 6.949 4.596 4.183 2.044

0.806451612903226 10.12 8.901 6.253 4.147 3.602 2.007

0.838709677419355 10.02 8.667 5.659 4.097 3.517 2.006

0.870967741935484 9.469 8.658 5.322 3.703 3.455 1.749

0.903225806451613 8.942 7.802 4.995 3.474 3.17 1.64

0.935483870967742 6.727 5.868 3.958 3.099 2.603 1.581

0.967741935483871 4.907 4.33 3.495 2.544 2.321 1.265

0.1 30.904 26.695 18.707 11.32 9.366 4.6055

Average of yearly averages: 3.12343333333333

Inputs generated by pe5.pl - Novemeber 2006

Data used for this run:

Output File: KScorn_aerial

Metfile: w13996.dvf

PRZM scenario: KSCornStd.txt

EXAMS environment file: ir298.exv

Chemical Name: Chlorpyrifos

Description Variable Name Value Units Comments

Molecular weightmwt 350.6 g/mol

Henry's Law Const. henry 6.2e-6 atm-m^3/mol

Vapor Pressure vapr 1.87e-5 torr

Solubility sol 1.4 mg/L

Kd Kd mg/L

Koc Koc 6040 mg/L

Photolysis half-life kdp 29.6 days Half-life

Aerobic Aquatic Metabolism kbacw 91.5 days Halfife

Anaerobic Aquatic Metabolism kbacs 63 days Halfife

Aerobic Soil Metabolism asm 109 days Halfife

Hydrolysis: pH 7 81 days Half-life

Method: CAM 2 integer See PRZM manual

Incorporation Depth: DEPI 0 cm

Application Rate:TAPP 1.1 kg/ha

Application Efficiency: APPEFF0.95 fraction

Spray Drift DRFT 0.039 fraction of application rate applied to pond

Application Date Date 15-5 dd/mm or dd/mmm or dd-mm or dd-mmm

Interval 1 interval 10 days Set to 0 or delete line for single app.

app. rate 1 apprate 1.1 kg/ha

Interval 2 interval 10 days Set to 0 or delete line for single app.

app. rate 2 apprate 1.1 kg/ha

Record 17: FILTRA

IPSCND1

UPTKF

Record 18: PLVKRT

PLDKRT

FEXTRC 0.5

Flag for Index Res. Run IR Reservoir
87

Flag for runoff calc. RUNOFF total none, monthly or total(average of entire run)

Corn-Average Typical Rate

stored as KScorn_typical inc.out

Chemical: Chlorpyrifos

PRZM environment: KSCornStd.txt modified Monday, 25 August 2008 at 15:45:08

EXAMS environment: ir298.exv modified Thuday, 29 August 2002 at 16:34:12

Metfile: w13996.dvf modified Wedday, 3 July 2002 at 10:04:44

Water segment concentrations (ppb)

Year Peak 96 hr 21 Day 60 Day 90 Day Yearly

1961 2.793 2.426 1.683 1.114 1.008 0.4371

1962 3.323 2.838 1.827 1.207 1.049 0.4989

1963 2.34 2.071 1.42 0.8743 0.7997 0.3366

1964 2.417 2.087 1.633 0.9547 0.8954 0.4307

1965 2.061 1.879 1.42 1.199 0.9656 0.4853

1966 3.593 3.17 2.057 1.185 0.9574 0.3781

1967 5.777 5.167 3.861 2.53 2.083 0.8483

1968 2.984 2.595 2.182 1.388 1.182 0.6019

1969 2.571 2.243 1.979 1.54 1.319 0.5596

1970 2.176 1.907 1.541 1.046 0.8258 0.3877

1971 1.822 1.625 1.198 0.8064 0.6524 0.3079

1972 2.632 2.279 1.427 0.8246 0.7391 0.3989

1973 3.491 3.037 1.999 1.414 1.436 0.8224

1974 1.85 1.632 1.072 0.7658 0.6697 0.447

1975 1.685 1.546 1.047 0.6962 0.5451 0.2998

1976 1.145 1.011 0.7145 0.5134 0.4436 0.2084

1977 4.889 4.277 2.981 2.545 2.11 0.8596

1978 3.576 3.26 2.142 1.42 1.178 0.5946

1979 1.98 1.726 1.419 0.9305 0.8676 0.4648

1980 2.535 2.2 1.509 0.83 0.7397 0.419

1981 3.91 3.394 2.162 1.761 1.626 0.7074

1982 4.409 3.883 3.012 2.128 1.846 0.7502

1983 1.175 1.084 0.7382 0.6624 0.5956 0.329

1984 4.249 3.662 2.571 1.6 1.257 0.4919

1985 1.885 1.727 1.206 0.8493 0.8449 0.5144

1986 3.765 3.388 2.768 1.692 1.387 0.6298

1987 1.522 1.338 1.053 0.8784 0.7878 0.4149

1988 1.355 1.222 0.8626 0.5495 0.4809 0.2349

1989 3.317 2.869 1.902 1.22 1.127 0.618

1990 2.851 2.477 1.553 1.119 0.9974 0.5128

Sorted results

Prob. Peak 96 hr 21 Day 60 Day 90 Day Yearly

0.032258064516129 5.777 5.167 3.861 2.545 2.11 0.8596

0.0645161290322581 4.889 4.277 3.012 2.53 2.083 0.8483

0.0967741935483871 4.409 3.883 2.981 2.128 1.846 0.8224

0.129032258064516 4.249 3.662 2.768 1.761 1.626 0.7502

0.161290322580645 3.91 3.394 2.571 1.692 1.436 0.7074

0.193548387096774 3.765 3.388 2.182 1.6 1.387 0.6298

0.225806451612903 3.593 3.26 2.162 1.54 1.319 0.618

0.258064516129032 3.576 3.17 2.142 1.42 1.257 0.6019

0.290322580645161 3.491 3.037 2.057 1.414 1.182 0.5946

0.32258064516129 3.323 2.869 1.999 1.388 1.178 0.5596

0.354838709677419 3.317 2.838 1.979 1.22 1.127 0.5144

0.387096774193548 2.984 2.595 1.902 1.207 1.049 0.5128
88

0.419354838709677 2.851 2.477 1.827 1.199 1.008 0.4989

0.451612903225806 2.793 2.426 1.683 1.185 0.9974 0.4919

0.483870967741936 2.632 2.279 1.633 1.119 0.9656 0.4853

0.516129032258065 2.571 2.243 1.553 1.114 0.9574 0.4648

0.548387096774194 2.535 2.2 1.541 1.046 0.8954 0.447

0.580645161290323 2.417 2.087 1.509 0.9547 0.8676 0.4371

0.612903225806452 2.34 2.071 1.427 0.9305 0.8449 0.4307

0.645161290322581 2.176 1.907 1.42 0.8784 0.8258 0.419

0.67741935483871 2.061 1.879 1.42 0.8743 0.7997 0.4149

0.709677419354839 1.98 1.727 1.419 0.8493 0.7878 0.3989

0.741935483870968 1.885 1.726 1.206 0.83 0.7397 0.3877

0.774193548387097 1.85 1.632 1.198 0.8246 0.7391 0.3781

0.806451612903226 1.822 1.625 1.072 0.8064 0.6697 0.3366

0.838709677419355 1.685 1.546 1.053 0.7658 0.6524 0.329

0.870967741935484 1.522 1.338 1.047 0.6962 0.5956 0.3079

0.903225806451613 1.355 1.222 0.8626 0.6624 0.5451 0.2998

0.935483870967742 1.175 1.084 0.7382 0.5495 0.4809 0.2349

0.967741935483871 1.145 1.011 0.7145 0.5134 0.4436 0.2084

0.1 4.393 3.8609 2.9597 2.0913 1.824 0.81518

Average of yearly averages: 0.499663333333333

Inputs generated by pe5.pl - Novemeber 2006

Data used for this run:

Output File: KScorn_typical inc

Metfile: w13996.dvf

PRZM scenario: KSCornStd.txt

EXAMS environment file: ir298.exv

Chemical Name: Chlorpyrifos

Description Variable Name Value Units Comments

Molecular weightmwt 350.6 g/mol

Henry's Law Const. henry 6.2e-6 atm-m^3/mol

Vapor Pressure vapr 1.87e-5 torr

Solubility sol 1.4 mg/L

Kd Kd mg/L

Koc Koc 6040 mg/L

Photolysis half-life kdp 29.6 days Half-life

Aerobic Aquatic Metabolism kbacw 91.5 days Halfife

Anaerobic Aquatic Metabolism kbacs 63 days Halfife

Aerobic Soil Metabolism asm 109 days Halfife

Hydrolysis: pH 7 81 days Half-life

Method: CAM 4 integer See PRZM manual

Incorporation Depth: DEPI 4 cm

Application Rate:TAPP 0.99 kg/ha

Application Efficiency: APPEFF1.0 fraction

Spray Drift DRFT 0 fraction of application rate applied to pond

Application Date Date 1-5 dd/mm or dd/mmm or dd-mm or dd-mmm

Record 17: FILTRA

IPSCND1

UPTKF

Record 18: PLVKRT

PLDKRT

FEXTRC 0.5

Flag for Index Res. Run IR Reservoir

Flag for runoff calc. RUNOFF total none, monthly or total(average of entire run)
89

NC Cotton 

stored as NCCotton_aerial.out

Chemical: Chlorpyrifos

PRZM environment: NCcottonSTD.txt modified Tueday, 29 May 2007 at 13:58:38

EXAMS environment: ir298.exv modified Thuday, 29 August 2002 at 16:34:12

Metfile: w13722.dvf modified Wedday, 3 July 2002 at 10:05:50

Water segment concentrations (ppb)

Year Peak 96 hr 21 Day 60 Day 90 Day Yearly

1961 14.04 12.46 9.297 6.386 6.508 2.572

1962 31.65 27.82 20.73 16.96 14.06 5.908

1963 27.78 25.06 18.05 11.95 9.641 4.605

1964 15.93 14.01 9.158 7.707 7.597 4.378

1965 55.07 49.08 38.1 24.34 19.83 7.509

1966 31.44 27.71 19.07 13.12 11.92 5.557

1967 43.45 38 26.69 16.62 13.85 5.832

1968 29.1 25.5 18.07 13.94 11.83 5.292

1969 28.62 25.32 17.91 13.78 12.79 5.862

1970 18.05 15.83 12.48 9.606 7.842 3.994

1971 26.03 22.86 15.64 13.03 11.83 5.61

1972 36.96 32.52 22.43 16.39 13.68 6.327

1973 43.59 39.2 31.33 20.12 17.21 7.091

1974 20.74 18.29 13.82 9.841 9.522 4.884

1975 30.24 27.37 19.47 14.9 13.3 5.949

1976 20.24 17.98 14.51 10.72 8.476 4.735

1977 29.92 26.98 18.18 10.65 9.156 5.231

1978 26.35 23.19 16.36 13.49 11.09 5.034

1979 16.81 15.14 12.36 10.37 9.327 5.043

1980 36.6 32.05 20.76 12.41 10.86 5.084

1981 27.48 24.67 17.64 12.36 11.35 5.404

1982 48.52 42.95 31.9 21.59 17.28 6.797

1983 22.18 19.65 17.41 12.56 9.96 4.589

1984 43.7 38.73 25.36 18.67 16.09 6.456

1985 17.42 15.72 12.71 10.67 9.463 4.834

1986 21.43 18.99 14.33 10.72 9.368 4.954

1987 15.76 13.89 12.3 7.943 6.559 4.094

1988 13.19 11.91 9.661 6.708 5.942 3.944

1989 40.18 35.98 24.8 16.01 13.32 5.552

1990 36.13 31.53 20.82 12.14 9.605 4.195

Sorted results

Prob. Peak 96 hr 21 Day 60 Day 90 Day Yearly

0.032258064516129 55.07 49.08 38.1 24.34 19.83 7.509

0.0645161290322581 48.52 42.95 31.9 21.59 17.28 7.091

0.0967741935483871 43.7 39.2 31.33 20.12 17.21 6.797

0.129032258064516 43.59 38.73 26.69 18.67 16.09 6.456

0.161290322580645 43.45 38 25.36 16.96 14.06 6.327

0.193548387096774 40.18 35.98 24.8 16.62 13.85 5.949

0.225806451612903 36.96 32.52 22.43 16.39 13.68 5.908

0.258064516129032 36.6 32.05 20.82 16.01 13.32 5.862

0.290322580645161 36.13 31.53 20.76 14.9 13.3 5.832

0.32258064516129 31.65 27.82 20.73 13.94 12.79 5.61

0.354838709677419 31.44 27.71 19.47 13.78 11.92 5.557

0.387096774193548 30.24 27.37 19.07 13.49 11.83 5.552

0.419354838709677 29.92 26.98 18.18 13.12 11.83 5.404

0.451612903225806 29.1 25.5 18.07 13.03 11.35 5.292
90

0.483870967741936 28.62 25.32 18.05 12.56 11.09 5.231

0.516129032258065 27.78 25.06 17.91 12.41 10.86 5.084

0.548387096774194 27.48 24.67 17.64 12.36 9.96 5.043

0.580645161290323 26.35 23.19 17.41 12.14 9.641 5.034

0.612903225806452 26.03 22.86 16.36 11.95 9.605 4.954

0.645161290322581 22.18 19.65 15.64 10.72 9.522 4.884

0.67741935483871 21.43 18.99 14.51 10.72 9.463 4.834

0.709677419354839 20.74 18.29 14.33 10.67 9.368 4.735

0.741935483870968 20.24 17.98 13.82 10.65 9.327 4.605

0.774193548387097 18.05 15.83 12.71 10.37 9.156 4.589

0.806451612903226 17.42 15.72 12.48 9.841 8.476 4.378

0.838709677419355 16.81 15.14 12.36 9.606 7.842 4.195

0.870967741935484 15.93 14.01 12.3 7.943 7.597 4.094

0.903225806451613 15.76 13.89 9.661 7.707 6.559 3.994

0.935483870967742 14.04 12.46 9.297 6.708 6.508 3.944

0.967741935483871 13.19 11.91 9.158 6.386 5.942 2.572

0.1 43.689 39.153 30.866 19.975 17.098 6.7629

Average of yearly averages: 5.24386666666667

Inputs generated by pe5.pl - Novemeber 2006

Data used for this run:

Output File: NCCotton_aerial

Metfile: w13722.dvf

PRZM scenario: NCcottonSTD.txt

EXAMS environment file: ir298.exv

Chemical Name: Chlorpyrifos

Description Variable Name Value Units Comments

Molecular weightmwt 350.6 g/mol

Henry's Law Const. henry 6.2e-6 atm-m^3/mol

Vapor Pressure vapr 1.87e-5 torr

Solubility sol 1.4 mg/L

Kd Kd mg/L

Koc Koc 6040 mg/L

Photolysis half-life kdp 29.6 days Half-life

Aerobic Aquatic Metabolism kbacw 91.5 days Halfife

Anaerobic Aquatic Metabolism kbacs 63 days Halfife

Aerobic Soil Metabolism asm 109 days Halfife

Hydrolysis: pH 7 81 days Half-life

Method: CAM 2 integer See PRZM manual

Incorporation Depth: DEPI 0 cm

Application Rate:TAPP 1.1 kg/ha

Application Efficiency: APPEFF0.95 fraction

Spray Drift DRFT 0.039 fraction of application rate applied to pond

Application Date Date 15-05 dd/mm or dd/mmm or dd-mm or dd-mmm

Interval 1 interval 10 days Set to 0 or delete line for single app.

app. rate 1 apprate 1.1 kg/ha

Interval 2 interval 10 days Set to 0 or delete line for single app.

app. rate 2 apprate 1.1 kg/ha

Record 17: FILTRA

IPSCND1

UPTKF

Record 18: PLVKRT

PLDKRT

FEXTRC 0.5
91

Flag for Index Res. Run IR Reservoir

Flag for runoff calc. RUNOFF total none, monthly or total(average of entire run)

NY Grape (drench; high rate; July application)

stored as NYGrape_drench 7_15.out

Chemical: Chlorpyrifos

PRZM environment: NYGrapesSTD.txt modified Tueday, 29 May 2007 at 13:59:44

EXAMS environment: ir298.exv modified Thuday, 29 August 2002 at 16:34:12

Metfile: w14860.dvf modified Wedday, 3 July 2002 at 10:06:14

Water segment concentrations (ppb)

Year Peak 96 hr 21 Day 60 Day 90 Day Yearly

1961 50.86 44.34 30.55 23.06 21.15 8.824

1962 563 492 331 198 162 60.3

1963 128 114 89.23 68.73 56.76 44.26

1964 628 545 340 193 153 60.22

1965 143 126 82.5 60.51 58.93 40.95

1966 354 309 197 116 93.85 46.55

1967 134 119 81.12 67.88 63.7 37.71

1968 108 94.95 61.62 49.81 41.95 28.15

1969 47.06 44.44 37.41 31.67 29 18.28

1970 686 595 408 244 205 73.23

1971 353 309 199 129 110 62.13

1972 94.15 84.79 64.92 51.64 47.23 35.94

1973 211 185 118 70.4 57.73 30.27

1974 250 218 143 88.68 72.63 35.94

1975 405 359 259 210 178 76.92

1976 103 92.15 80.46 63.39 57.41 43.94

1977 584 512 382 252 205 78.09

1978 524 459 312 201 165 82.16

1979 585 511 325 243 205 89.98

1980 628 551 361 231 187 88.79

1981 289 253 192 139 122 66.7

1982 342 300 195 127 106 55.65

1983 522 459 356 225 187 76.13

1984 391 342 222 132 107 54.16

1985 183 161 113 86.6 69.56 39.08

1986 409 355 243 142 116 50.15

1987 532 462 295 228 189 81.08

1988 372 325 207 151 130 68.17

1989 235 205 132 97.32 81.73 45.55

1990 419 369 268 194 158 62.18

Sorted results

Prob. Peak 96 hr 21 Day 60 Day 90 Day Yearly

0.032258064516129 686 595 408 252 205 89.98

0.0645161290322581 628 551 382 244 205 88.79

0.0967741935483871 628 545 361 243 205 82.16

0.129032258064516 585 512 356 231 189 81.08

0.161290322580645 584 511 340 228 187 78.09

0.193548387096774 563 492 331 225 187 76.92

0.225806451612903 532 462 325 210 178 76.13

0.258064516129032 524 459 312 201 165 73.23

0.290322580645161 522 459 295 198 162 68.17

0.32258064516129 419 369 268 194 158 66.7

0.354838709677419 409 359 259 193 153 62.18
92

0.387096774193548 405 355 243 151 130 62.13

0.419354838709677 391 342 222 142 122 60.3

0.451612903225806 372 325 207 139 116 60.22

0.483870967741936 354 309 199 132 110 55.65

0.516129032258065 353 309 197 129 107 54.16

0.548387096774194 342 300 195 127 106 50.15

0.580645161290323 289 253 192 116 93.85 46.55

0.612903225806452 250 218 143 97.32 81.73 45.55

0.645161290322581 235 205 132 88.68 72.63 44.26

0.67741935483871 211 185 118 86.6 69.56 43.94

0.709677419354839 183 161 113 70.4 63.7 40.95

0.741935483870968 143 126 89.23 68.73 58.93 39.08

0.774193548387097 134 119 82.5 67.88 57.73 37.71

0.806451612903226 128 114 81.12 63.39 57.41 35.94

0.838709677419355 108 94.95 80.46 60.51 56.76 35.94

0.870967741935484 103 92.15 64.92 51.64 47.23 30.27

0.903225806451613 94.15 84.79 61.62 49.81 41.95 28.15

0.935483870967742 50.86 44.44 37.41 31.67 29 18.28

0.967741935483871 47.06 44.34 30.55 23.06 21.15 8.824

0.1 623.7 541.7 360.5 241.8 203.4 82.052

Average of yearly averages: 54.7161333333333

Inputs generated by pe5.pl - Novemeber 2006

Data used for this run:

Output File: NYGrape_drench 7_15

Metfile: w14860.dvf

PRZM scenario: NYGrapesSTD.txt

EXAMS environment file: ir298.exv

Chemical Name: Chlorpyrifos

Description Variable Name Value Units Comments

Molecular weightmwt 350.6 g/mol

Henry's Law Const. henry 6.2e-6 atm-m^3/mol

Vapor Pressure vapr 1.87e-5 torr

Solubility sol 1.4 mg/L

Kd Kd mg/L

Koc Koc 6040 mg/L

Photolysis half-life kdp 29.6 days Half-life

Aerobic Aquatic Metabolism kbacw 91.5 days Halfife

Anaerobic Aquatic Metabolism kbacs 63 days Halfife

Aerobic Soil Metabolism asm 109 days Halfife

Hydrolysis: pH 7 81 days Half-life

Method: CAM 1 integer See PRZM manual

Incorporation Depth: DEPI 0 cm

Application Rate:TAPP 37.3 kg/ha

Application Efficiency: APPEFF0.99 fraction

Spray Drift DRFT 0.01 fraction of application rate applied to pond

Application Date Date 15-7 dd/mm or dd/mmm or dd-mm or dd-mmm

Record 17: FILTRA

IPSCND1

UPTKF

Record 18: PLVKRT

PLDKRT

FEXTRC 0.5

Flag for Index Res. Run IR Reservoir
93

Flag for runoff calc. RUNOFF total none, monthly or total(average of entire run)

NY Grape (drench; high rate; May application)

stored as NYGrape_drench 5_15.out

Chemical: Chlorpyrifos

PRZM environment: NYGrapesSTD.txt modified Tueday, 29 May 2007 at 13:59:44

EXAMS environment: ir298.exv modified Thuday, 29 August 2002 at 16:34:12

Metfile: w14860.dvf modified Wedday, 3 July 2002 at 10:06:14

Water segment concentrations (ppb)

Year Peak 96 hr 21 Day 60 Day 90 Day Yearly

1961 96.35 83.86 52.87 32.3 27.08 11.31

1962 369 349 241 145 132 51.23

1963 70.1 62.44 48.02 37.74 31.65 25.42

1964 400 347 219 140 132 55.36

1965 350 306 199 138 129 58.71

1966 199 176 141 86.97 85.94 42.27

1967 398 349 230 139 115 49.49

1968 54.69 48.63 33.44 32.49 30.02 21.73

1969 183 160 114 80.64 67.8 30.09

1970 366 319 202 147 132 55.27

1971 174 154 102 67.55 58.25 34.89

1972 447 391 269 220 180 71.39

1973 495 433 320 198 158 65.86

1974 376 332 219 148 123 53.74

1975 326 285 184 125 114 57.97

1976 446 389 250 170 145 62.9

1977 288 253 168 132 111 55.15

1978 255 224 154 101 83.5 45.82

1979 485 427 284 179 158 71.85

1980 426 374 283 196 168 73.34

1981 165 145 95.85 82 72.74 42.28

1982 1070 932 613 360 284 103

1983 345 303 195 154 126 58.92

1984 300 263 174 105 90.18 47.53

1985 258 226 149 123 104 47.8

1986 773 692 458 287 225 84.84

1987 180 160 116 98.86 87.01 47.02

1988 224 196 127 77.28 77.95 44.34

1989 280 250 172 134 110 50.15

1990 219 192 125 86.28 71.52 44.4

Sorted results

Prob. Peak 96 hr 21 Day 60 Day 90 Day Yearly

0.032258064516129 1070 932 613 360 284 103

0.0645161290322581 773 692 458 287 225 84.84

0.0967741935483871 495 433 320 220 180 73.34

0.129032258064516 485 427 284 198 168 71.85

0.161290322580645 447 391 283 196 158 71.39

0.193548387096774 446 389 269 179 158 65.86

0.225806451612903 426 374 250 170 145 62.9

0.258064516129032 400 349 241 154 132 58.92

0.290322580645161 398 349 230 148 132 58.71

0.32258064516129 376 347 219 147 132 57.97

0.354838709677419 369 332 219 145 129 55.36

0.387096774193548 366 319 202 140 126 55.27
94

0.419354838709677 350 306 199 139 123 55.15

0.451612903225806 345 303 195 138 115 53.74

0.483870967741936 326 285 184 134 114 51.23

0.516129032258065 300 263 174 132 111 50.15

0.548387096774194 288 253 172 125 110 49.49

0.580645161290323 280 250 168 123 104 47.8

0.612903225806452 258 226 154 105 90.18 47.53

0.645161290322581 255 224 149 101 87.01 47.02

0.67741935483871 224 196 141 98.86 85.94 45.82

0.709677419354839 219 192 127 86.97 83.5 44.4

0.741935483870968 199 176 125 86.28 77.95 44.34

0.774193548387097 183 160 116 82 72.74 42.28

0.806451612903226 180 160 114 80.64 71.52 42.27

0.838709677419355 174 154 102 77.28 67.8 34.89

0.870967741935484 165 145 95.85 67.55 58.25 30.09

0.903225806451613 96.35 83.86 52.87 37.74 31.65 25.42

0.935483870967742 70.1 62.44 48.02 32.49 30.02 21.73

0.967741935483871 54.69 48.63 33.44 32.3 27.08 11.31

0.1 494 432.4 316.4 217.8 178.8 73.191

Average of yearly averages: 52.1356666666667

Inputs generated by pe5.pl - Novemeber 2006

Data used for this run:

Output File: NYGrape_drench 5_15

Metfile: w14860.dvf

PRZM scenario: NYGrapesSTD.txt

EXAMS environment file: ir298.exv

Chemical Name: Chlorpyrifos

Description Variable Name Value Units Comments

Molecular weightmwt 350.6 g/mol

Henry's Law Const. henry 6.2e-6 atm-m^3/mol

Vapor Pressure vapr 1.87e-5 torr

Solubility sol 1.4 mg/L

Kd Kd mg/L

Koc Koc 6040 mg/L

Photolysis half-life kdp 29.6 days Half-life

Aerobic Aquatic Metabolism kbacw 91.5 days Halfife

Anaerobic Aquatic Metabolism kbacs 63 days Halfife

Aerobic Soil Metabolism asm 109 days Halfife

Hydrolysis: pH 7 81 days Half-life

Method: CAM 1 integer See PRZM manual

Incorporation Depth: DEPI 0 cm

Application Rate:TAPP 37.3 kg/ha

Application Efficiency: APPEFF0.99 fraction

Spray Drift DRFT 0.01 fraction of application rate applied to pond

Application Date Date 15-5 dd/mm or dd/mmm or dd-mm or dd-mmm

Record 17: FILTRA

IPSCND1

UPTKF

Record 18: PLVKRT

PLDKRT

FEXTRC 0.5

Flag for Index Res. Run IR Reservoir

Flag for runoff calc. RUNOFF total none, monthly or total(average of entire run)
95

NY Grape(low rate)

stored as NYGrape_drench 6lbs july.out

Chemical: Chlorpyrifos

PRZM environment: NYGrapesSTD.txt modified Tueday, 29 May 2007 at 13:59:44

EXAMS environment: ir298.exv modified Thuday, 29 August 2002 at 16:34:12

Metfile: w14860.dvf modified Wedday, 3 July 2002 at 10:06:14

Water segment concentrations (ppb)

Year Peak 96 hr 21 Day 60 Day 90 Day Yearly

1961 9.134 7.964 5.487 4.141 3.798 1.585

1962 101 88.34 59.41 35.51 29.02 10.83

1963 23.06 20.5 16.03 12.35 10.2 7.951

1964 113 97.84 61.12 34.66 27.47 10.82

1965 25.76 22.62 14.82 10.87 10.59 7.355

1966 63.53 55.45 35.4 20.8 16.86 8.362

1967 24.15 21.33 14.57 12.19 11.44 6.773

1968 19.45 17.06 11.07 8.947 7.535 5.057

1969 8.453 7.982 6.719 5.688 5.209 3.283

1970 123 107 73.35 43.83 36.86 13.15

1971 63.37 55.42 35.74 23.13 19.75 11.16

1972 16.91 15.23 11.66 9.275 8.484 6.456

1973 37.94 33.15 21.21 12.64 10.37 5.437

1974 44.84 39.19 25.75 15.93 13.05 6.455

1975 72.82 64.54 46.51 37.65 31.96 13.82

1976 18.56 16.55 14.45 11.39 10.31 7.892

1977 105 91.94 68.6 45.28 36.85 14.03

1978 94.23 82.47 56.06 36.08 29.69 14.76

1979 105 91.76 58.29 43.67 36.76 16.16

1980 113 98.96 64.92 41.42 33.5 15.95

1981 51.84 45.42 34.5 25.01 21.84 11.98

1982 61.47 53.92 35.02 22.75 19.07 9.995

1983 93.84 82.42 64.03 40.4 33.55 13.67

1984 70.3 61.42 39.82 23.77 19.2 9.729

1985 32.83 28.91 20.38 15.56 12.49 7.019

1986 73.52 63.73 43.66 25.48 20.8 9.009

1987 95.46 83 52.92 40.97 33.88 14.56

1988 66.78 58.36 37.25 27.2 23.37 12.25

1989 42.24 36.91 23.7 17.48 14.68 8.183

1990 75.24 66.32 48.21 34.88 28.37 11.17

Sorted results

Prob. Peak 96 hr 21 Day 60 Day 90 Day Yearly

0.032258064516129 123 107 73.35 45.28 36.86 16.16

0.0645161290322581 113 98.96 68.6 43.83 36.85 15.95

0.0967741935483871 113 97.84 64.92 43.67 36.76 14.76

0.129032258064516 105 91.94 64.03 41.42 33.88 14.56

0.161290322580645 105 91.76 61.12 40.97 33.55 14.03

0.193548387096774 101 88.34 59.41 40.4 33.5 13.82

0.225806451612903 95.46 83 58.29 37.65 31.96 13.67

0.258064516129032 94.23 82.47 56.06 36.08 29.69 13.15

0.290322580645161 93.84 82.42 52.92 35.51 29.02 12.25

0.32258064516129 75.24 66.32 48.21 34.88 28.37 11.98

0.354838709677419 73.52 64.54 46.51 34.66 27.47 11.17

0.387096774193548 72.82 63.73 43.66 27.2 23.37 11.16

0.419354838709677 70.3 61.42 39.82 25.48 21.84 10.83
96

0.451612903225806 66.78 58.36 37.25 25.01 20.8 10.82

0.483870967741936 63.53 55.45 35.74 23.77 19.75 9.995

0.516129032258065 63.37 55.42 35.4 23.13 19.2 9.729

0.548387096774194 61.47 53.92 35.02 22.75 19.07 9.009

0.580645161290323 51.84 45.42 34.5 20.8 16.86 8.362

0.612903225806452 44.84 39.19 25.75 17.48 14.68 8.183

0.645161290322581 42.24 36.91 23.7 15.93 13.05 7.951

0.67741935483871 37.94 33.15 21.21 15.56 12.49 7.892

0.709677419354839 32.83 28.91 20.38 12.64 11.44 7.355

0.741935483870968 25.76 22.62 16.03 12.35 10.59 7.019

0.774193548387097 24.15 21.33 14.82 12.19 10.37 6.773

0.806451612903226 23.06 20.5 14.57 11.39 10.31 6.456

0.838709677419355 19.45 17.06 14.45 10.87 10.2 6.455

0.870967741935484 18.56 16.55 11.66 9.275 8.484 5.437

0.903225806451613 16.91 15.23 11.07 8.947 7.535 5.057

0.935483870967742 9.134 7.982 6.719 5.688 5.209 3.283

0.967741935483871 8.453 7.964 5.487 4.141 3.798 1.585

0.1 112.2 97.25 64.831 43.445 36.472 14.74

Average of yearly averages: 9.82836666666667

Inputs generated by pe5.pl - Novemeber 2006

Data used for this run:

Output File: NYGrape_drench 6lbs july

Metfile: w14860.dvf

PRZM scenario: NYGrapesSTD.txt

EXAMS environment file: ir298.exv

Chemical Name: Chlorpyrifos

Description Variable Name Value Units Comments

Molecular weightmwt 350.6 g/mol

Henry's Law Const. henry 6.2e-6 atm-m^3/mol

Vapor Pressure vapr 1.87e-5 torr

Solubility sol 1.4 mg/L

Kd Kd mg/L

Koc Koc 6040 mg/L

Photolysis half-life kdp 29.6 days Half-life

Aerobic Aquatic Metabolism kbacw 91.5 days Halfife

Anaerobic Aquatic Metabolism kbacs 63 days Halfife

Aerobic Soil Metabolism asm 109 days Halfife

Hydrolysis: pH 7 81 days Half-life

Method: CAM 1 integer See PRZM manual

Incorporation Depth: DEPI 0 cm

Application Rate:TAPP 6.7 kg/ha

Application Efficiency: APPEFF0.99 fraction

Spray Drift DRFT 0.01 fraction of application rate applied to pond

Application Date Date 15-7 dd/mm or dd/mmm or dd-mm or dd-mmm

Record 17: FILTRA

IPSCND1

UPTKF

Record 18: PLVKRT

PLDKRT

FEXTRC 0.5

Flag for Index Res. Run IR Reservoir

Flag for runoff calc. RUNOFF total none, monthly or total(average of entire run)
97

Grape Average Typical Rate (CA)

stored as CAGrape_typical_1_28-02.out

Chemical: Chlorpyrifos

PRZM environment: CAgrapes_WirrigSTD.txt modified Tueday, 29 May 2007 at 13:42:54

EXAMS environment: ir298.exv modified Thuday, 29 August 2002 at 16:34:12

Metfile: w93193.dvf modified Wedday, 3 July 2002 at 10:04:24

Water segment concentrations (ppb)

Year Peak 96 hr 21 Day 60 Day 90 Day Yearly

1961 0.9586 0.8541 0.5497 0.2907 0.2174 0.1406

1962 1.241 1.089 0.699 0.5212 0.4129 0.2139

1963 1.246 1.094 0.7627 0.6028 0.5255 0.279

1964 0.9844 0.8589 0.5761 0.3183 0.2426 0.182

1965 4.286 3.717 2.286 1.267 0.9883 0.4044

1966 1.295 1.128 0.7203 0.3198 0.2377 0.201

1967 1.745 1.572 1.018 0.6733 0.6219 0.3099

1968 0.9803 0.8537 0.5749 0.3717 0.2954 0.2186

1969 2.944 2.572 1.741 1.307 1.163 0.5037

1970 2.944 2.586 1.654 0.9195 0.7914 0.387

1971 1.015 0.9215 0.6161 0.4117 0.3623 0.2202

1972 1.022 0.8985 0.6039 0.3334 0.2467 0.2008

1973 1.083 0.9479 0.6269 0.4676 0.3866 0.2166

1974 0.9866 0.8592 0.5613 0.3218 0.2791 0.1934

1975 0.9673 0.8372 0.5453 0.2947 0.2259 0.1494

1976 2.146 1.864 1.149 0.6341 0.5037 0.3059

1977 1.068 0.9233 0.6053 0.3667 0.2985 0.2108

1978 2.406 2.097 1.373 1.094 0.8974 0.434

1979 0.997 0.8685 0.578 0.3096 0.2406 0.1614

1980 1.563 1.364 1.03 0.6365 0.5221 0.2625

1981 1.03 0.8981 0.6069 0.4421 0.3892 0.211

1982 1.086 1.007 0.7713 0.6146 0.4881 0.3269

1983 2.333 2.049 1.377 1.054 0.929 0.5125

1984 0.9792 0.8786 0.5941 0.3201 0.246 0.1739

1985 0.9656 0.877 0.5561 0.3072 0.2337 0.1652

1986 1.952 1.706 1.22 0.7758 0.614 0.3114

1987 1.08 0.9514 0.6315 0.3812 0.4048 0.2347

1988 1.143 1.018 0.6397 0.4644 0.4103 0.2119

1989 0.9885 0.8979 0.6221 0.3799 0.3072 0.196

1990 1.025 0.8979 0.6151 0.3668 0.3523 0.2322

Sorted results

Prob. Peak 96 hr 21 Day 60 Day 90 Day Yearly

0.032258064516129 4.286 3.717 2.286 1.307 1.163 0.5125

0.0645161290322581 2.944 2.586 1.741 1.267 0.9883 0.5037

0.0967741935483871 2.944 2.572 1.654 1.094 0.929 0.434

0.129032258064516 2.406 2.097 1.377 1.054 0.8974 0.4044

0.161290322580645 2.333 2.049 1.373 0.9195 0.7914 0.387

0.193548387096774 2.146 1.864 1.22 0.7758 0.6219 0.3269

0.225806451612903 1.952 1.706 1.149 0.6733 0.614 0.3114

0.258064516129032 1.745 1.572 1.03 0.6365 0.5255 0.3099

0.290322580645161 1.563 1.364 1.018 0.6341 0.5221 0.3059

0.32258064516129 1.295 1.128 0.7713 0.6146 0.5037 0.279

0.354838709677419 1.246 1.094 0.7627 0.6028 0.4881 0.2625

0.387096774193548 1.241 1.089 0.7203 0.5212 0.4129 0.2347

0.419354838709677 1.143 1.018 0.699 0.4676 0.4103 0.2322

0.451612903225806 1.086 1.007 0.6397 0.4644 0.4048 0.2202
98

0.483870967741936 1.083 0.9514 0.6315 0.4421 0.3892 0.2186

0.516129032258065 1.08 0.9479 0.6269 0.4117 0.3866 0.2166

0.548387096774194 1.068 0.9233 0.6221 0.3812 0.3623 0.2139

0.580645161290323 1.03 0.9215 0.6161 0.3799 0.3523 0.2119

0.612903225806452 1.025 0.8985 0.6151 0.3717 0.3072 0.211

0.645161290322581 1.022 0.8981 0.6069 0.3668 0.2985 0.2108

0.67741935483871 1.015 0.8979 0.6053 0.3667 0.2954 0.201

0.709677419354839 0.997 0.8979 0.6039 0.3334 0.2791 0.2008

0.741935483870968 0.9885 0.8786 0.5941 0.3218 0.2467 0.196

0.774193548387097 0.9866 0.877 0.578 0.3201 0.246 0.1934

0.806451612903226 0.9844 0.8685 0.5761 0.3198 0.2426 0.182

0.838709677419355 0.9803 0.8592 0.5749 0.3183 0.2406 0.1739

0.870967741935484 0.9792 0.8589 0.5613 0.3096 0.2377 0.1652

0.903225806451613 0.9673 0.8541 0.5561 0.3072 0.2337 0.1614

0.935483870967742 0.9656 0.8537 0.5497 0.2947 0.2259 0.1494

0.967741935483871 0.9586 0.8372 0.5453 0.2907 0.2174 0.1406

0.1 2.8902 2.5245 1.6263 1.09 0.92584 0.43104

Average of yearly averages: 0.259026666666667

Inputs generated by pe5.pl - Novemeber 2006

Data used for this run:

Output File: CAGrape_typical_1_28-02

Metfile: w93193.dvf

PRZM scenario: CAgrapes_WirrigSTD.txt

EXAMS environment file: ir298.exv

Chemical Name: Chlorpyrifos

Description Variable Name Value Units Comments

Molecular weightmwt 350.6 g/mol

Henry's Law Const. henry 6.2e-6 atm-m^3/mol

Vapor Pressure vapr 1.87e-5 torr

Solubility sol 1.4 mg/L

Kd Kd mg/L

Koc Koc 6040 mg/L

Photolysis half-life kdp 29.6 days Half-life

Aerobic Aquatic Metabolism kbacw 91.5 days Halfife

Anaerobic Aquatic Metabolism kbacs 63 days Halfife

Aerobic Soil Metabolism asm 109 days Halfife

Hydrolysis: pH 7 81 days Half-life

Method: CAM 1 integer See PRZM manual

Incorporation Depth: DEPI 0 cm

Application Rate:TAPP 2.5 kg/ha

Application Efficiency: APPEFF0.99 fraction

Spray Drift DRFT 0.01 fraction of application rate applied to pond

Application Date Date 28-02 dd/mm or dd/mmm or dd-mm or dd-mmm

Interval 1 interval 150 days Set to 0 or delete line for single app.

app. rate 1 apprate 2.5 kg/ha

Record 17: FILTRA

IPSCND1

UPTKF

Record 18: PLVKRT

PLDKRT

FEXTRC 0.5

Flag for Index Res. Run IR Reservoir

Flag for runoff calc. RUNOFF total none, monthly or total(average of entire run)
99

OR Mint

stored as OR Mint.out

Chemical: Chlorpyrifos

PRZM environment: ORmintSTD.txt modified Tueday, 29 May 2007 at 14:00:46

EXAMS environment: ir298.exv modified Thuday, 29 August 2002 at 16:34:12

Metfile: w24232.dvf modified Wedday, 3 July 2002 at 10:06:10

Water segment concentrations (ppb)

Year Peak 96 hr 21 Day 60 Day 90 Day Yearly

1961 6.982 6.053 3.352 1.978 1.473 0.4413

1962 12.25 10.6 6.999 4.194 3.438 1.59

1963 6.782 6.046 4.305 3.315 2.864 2.228

1964 17.68 16.1 8.556 5.005 3.526 2.038

1965 10.57 9.624 5.981 5.112 4.258 2.546

1966 11.4 10.41 7.375 4.949 3.964 2.516

1967 8.382 7.653 5.213 3.951 2.998 1.991

1968 11.35 10.1 7.844 5.295 4.504 2.762

1969 13.33 11.7 7.927 6.509 5.118 2.948

1970 9.936 8.003 6.59 5.661 4.927 2.914

1971 8.717 7.717 5.86 4.011 3.48 2.511

1972 10.8 9.475 6.182 4.183 3.585 2.167

1973 21.48 18.77 13.38 9.208 6.388 2.732

1974 12.08 11.19 8.118 5.935 5.144 3.229

1975 8.365 7.361 5.092 4.185 3.184 2.117

1976 4.253 3.898 3.279 2.725 2.581 1.369

1977 11.94 10.66 7.622 5.147 3.689 1.234

1978 6.895 6.047 4.544 3.389 2.911 1.961

1979 6.719 6.044 4.564 3.474 3.048 1.868

1980 16.97 14.84 9.699 6.632 4.624 2.446

1981 14.18 12.42 9.301 7.24 5.953 3.398

1982 8.565 7.701 6.409 4.356 3.914 2.55

1983 7.686 6.761 5.427 4.213 3.519 2.435

1984 15.59 13.58 9.84 7.149 5.161 2.442

1985 6.87 6.086 4.016 2.952 2.708 1.953

1986 7.974 7.011 5.21 3.048 2.272 1.475

1987 18.12 16.07 12.75 5.977 4.171 2.141

1988 9.977 8.886 6.007 4.26 3.652 2.248

1989 15.55 13.59 8.574 4.527 3.331 1.759

1990 9.156 7.983 5.669 4.412 3.66 2.363

Sorted results

Prob. Peak 96 hr 21 Day 60 Day 90 Day Yearly

0.032258064516129 21.48 18.77 13.38 9.208 6.388 3.398

0.0645161290322581 18.12 16.1 12.75 7.24 5.953 3.229

0.0967741935483871 17.68 16.07 9.84 7.149 5.161 2.948

0.129032258064516 16.97 14.84 9.699 6.632 5.144 2.914

0.161290322580645 15.59 13.59 9.301 6.509 5.118 2.762

0.193548387096774 15.55 13.58 8.574 5.977 4.927 2.732

0.225806451612903 14.18 12.42 8.556 5.935 4.624 2.55

0.258064516129032 13.33 11.7 8.118 5.661 4.504 2.546

0.290322580645161 12.25 11.19 7.927 5.295 4.258 2.516

0.32258064516129 12.08 10.66 7.844 5.147 4.171 2.511

0.354838709677419 11.94 10.6 7.622 5.112 3.964 2.446

0.387096774193548 11.4 10.41 7.375 5.005 3.914 2.442

0.419354838709677 11.35 10.1 6.999 4.949 3.689 2.435
100

0.451612903225806 10.8 9.624 6.59 4.527 3.66 2.363

0.483870967741936 10.57 9.475 6.409 4.412 3.652 2.248

0.516129032258065 9.977 8.886 6.182 4.356 3.585 2.228

0.548387096774194 9.936 8.003 6.007 4.26 3.526 2.167

0.580645161290323 9.156 7.983 5.981 4.213 3.519 2.141

0.612903225806452 8.717 7.717 5.86 4.194 3.48 2.117

0.645161290322581 8.565 7.701 5.669 4.185 3.438 2.038

0.67741935483871 8.382 7.653 5.427 4.183 3.331 1.991

0.709677419354839 8.365 7.361 5.213 4.011 3.184 1.961

0.741935483870968 7.974 7.011 5.21 3.951 3.048 1.953

0.774193548387097 7.686 6.761 5.092 3.474 2.998 1.868

0.806451612903226 6.982 6.086 4.564 3.389 2.911 1.759

0.838709677419355 6.895 6.053 4.544 3.315 2.864 1.59

0.870967741935484 6.87 6.047 4.305 3.048 2.708 1.475

0.903225806451613 6.782 6.046 4.016 2.952 2.581 1.369

0.935483870967742 6.719 6.044 3.352 2.725 2.272 1.234

0.967741935483871 4.253 3.898 3.279 1.978 1.473 0.4413

0.1 17.609 15.947 9.8259 7.0973 5.1593 2.9446

Average of yearly averages: 2.21241

Inputs generated by pe5.pl - Novemeber 2006

Data used for this run:

Output File: OR Mint

Metfile: w24232.dvf

PRZM scenario: ORmintSTD.txt

EXAMS environment file: ir298.exv

Chemical Name: Chlorpyrifos

Description Variable Name Value Units Comments

Molecular weightmwt 350.6 g/mol

Henry's Law Const. henry 6.2e-6 atm-m^3/mol

Vapor Pressure vapr 1.87e-5 torr

Solubility sol 1.4 mg/L

Kd Kd mg/L

Koc Koc 6040 mg/L

Photolysis half-life kdp 29.6 days Half-life

Aerobic Aquatic Metabolism kbacw 91.5 days Halfife

Anaerobic Aquatic Metabolism kbacs 63 days Halfife

Aerobic Soil Metabolism asm 109 days Halfife

Hydrolysis: pH 7 81 days Half-life

Method: CAM 1 integer See PRZM manual

Incorporation Depth: DEPI 0 cm

Application Rate:TAPP 2.2 kg/ha

Application Efficiency: APPEFF0.99 fraction

Spray Drift DRFT 0.01 fraction of application rate applied to pond

Application Date Date 30-04 dd/mm or dd/mmm or dd-mm or dd-mmm

Interval 1 interval 90 days Set to 0 or delete line for single app.

app. rate 1 apprate 2.2 kg/ha

Interval 2 interval 90 days Set to 0 or delete line for single app.

app. rate 2 apprate 2.2 kg/ha

Record 17: FILTRA

IPSCND1

UPTKF

Record 18: PLVKRT

PLDKRT
101

FEXTRC 0.5

Flag for Index Res. Run IR Reservoir

Flag for runoff calc. RUNOFF total none, monthly or total(average of entire run)

GA Onions

stored as GA Onions_dry bulb final 4-12.out

Chemical: Chlorpyrifos

PRZM environment: GAOnion_WirrigSTD.txt modified Tueday, 29 May 2007 at 13:54:42

EXAMS environment: ir298.exv modified Thuday, 29 August 2002 at 16:34:12

Metfile: w03822.dvf modified Wedday, 3 July 2002 at 10:04:32

Water segment concentrations (ppb)

Year Peak 96 hr 21 Day 60 Day 90 Day Yearly

1961 1.935 1.677 1.086 0.4158 0.2772 0.06835

1962 4.162 3.737 2.545 1.772 1.761 0.9677

1963 4.142 3.759 2.592 1.742 1.481 0.9686

1964 7.932 6.9 4.755 3.319 2.824 1.79

1965 3.688 3.222 2.34 1.878 1.64 0.9506

1966 4.626 4.087 2.844 2.337 2.083 1.113

1967 9.055 8.579 6.097 3.513 2.744 1.14

1968 1.734 1.521 1.004 0.6808 0.6256 0.3931

1969 4.323 3.749 2.423 2.066 1.726 1.046

1970 3.038 2.689 2.142 1.528 1.439 0.9658

1971 3.172 2.748 1.822 1.245 1.191 0.8923

1972 2.933 2.596 1.991 1.569 1.456 0.9174

1973 3.783 3.312 2.161 1.833 1.669 0.963

1974 2.364 2.062 1.392 1.014 0.8969 0.6229

1975 2.999 2.619 1.747 1.332 1.194 0.8066

1976 4.876 4.278 2.671 1.96 1.724 1.011

1977 3.176 2.786 2.043 1.304 1.102 0.6376

1978 5.9 5.116 2.491 1.796 1.552 0.8638

1979 4.769 4.176 2.867 1.988 1.827 1.356

1980 3.502 3.118 2.269 1.599 1.386 0.6973

1981 2.75 2.298 1.597 0.9862 0.7535 0.5127

1982 5.443 4.73 3.42 2.364 1.928 1.214

1983 5.877 5.201 4.319 3.201 2.99 1.505

1984 12.58 10.99 7.402 4.957 4.102 1.735

1985 2.236 1.926 1.267 0.7713 0.733 0.4292

1986 5.997 5.274 3.773 2.279 1.791 0.93

1987 8.349 7.272 5.081 3.527 2.924 1.407

1988 3.79 3.308 2.319 1.393 1.293 0.7504

1989 5.912 5.144 4.003 1.709 1.33 0.667

1990 6.836 6.029 4.174 2.829 2.393 1.149

Sorted results

Prob. Peak 96 hr 21 Day 60 Day 90 Day Yearly

0.032258064516129 12.58 10.99 7.402 4.957 4.102 1.79

0.0645161290322581 9.055 8.579 6.097 3.527 2.99 1.735

0.0967741935483871 8.349 7.272 5.081 3.513 2.924 1.505

0.129032258064516 7.932 6.9 4.755 3.319 2.824 1.407

0.161290322580645 6.836 6.029 4.319 3.201 2.744 1.356

0.193548387096774 5.997 5.274 4.174 2.829 2.393 1.214

0.225806451612903 5.912 5.201 4.003 2.364 2.083 1.149

0.258064516129032 5.9 5.144 3.773 2.337 1.928 1.14

0.290322580645161 5.877 5.116 3.42 2.279 1.827 1.113

0.32258064516129 5.443 4.73 2.867 2.066 1.791 1.046
102

0.354838709677419 4.876 4.278 2.844 1.988 1.761 1.011

0.387096774193548 4.769 4.176 2.671 1.96 1.726 0.9686

0.419354838709677 4.626 4.087 2.592 1.878 1.724 0.9677

0.451612903225806 4.323 3.759 2.545 1.833 1.669 0.9658

0.483870967741936 4.162 3.749 2.491 1.796 1.64 0.963

0.516129032258065 4.142 3.737 2.423 1.772 1.552 0.9506

0.548387096774194 3.79 3.312 2.34 1.742 1.481 0.93

0.580645161290323 3.783 3.308 2.319 1.709 1.456 0.9174

0.612903225806452 3.688 3.222 2.269 1.599 1.439 0.8923

0.645161290322581 3.502 3.118 2.161 1.569 1.386 0.8638

0.67741935483871 3.176 2.786 2.142 1.528 1.33 0.8066

0.709677419354839 3.172 2.748 2.043 1.393 1.293 0.7504

0.741935483870968 3.038 2.689 1.991 1.332 1.194 0.6973

0.774193548387097 2.999 2.619 1.822 1.304 1.191 0.667

0.806451612903226 2.933 2.596 1.747 1.245 1.102 0.6376

0.838709677419355 2.75 2.298 1.597 1.014 0.8969 0.6229

0.870967741935484 2.364 2.062 1.392 0.9862 0.7535 0.5127

0.903225806451613 2.236 1.926 1.267 0.7713 0.733 0.4292

0.935483870967742 1.935 1.677 1.086 0.6808 0.6256 0.3931

0.967741935483871 1.734 1.521 1.004 0.4158 0.2772 0.06835

0.1 8.3073 7.2348 5.0484 3.4936 2.914 1.4952

Average of yearly averages: 0.949011666666667

Inputs generated by pe5.pl - Novemeber 2006

Data used for this run:

Output File: GA Onions_dry bulb final 4-12

Metfile: w03822.dvf

PRZM scenario: GAOnion_WirrigSTD.txt

EXAMS environment file: ir298.exv

Chemical Name: Chlorpyrifos

Description Variable Name Value Units Comments

Molecular weightmwt 350.6 g/mol

Henry's Law Const. henry 6.2e-6 atm-m^3/mol

Vapor Pressure vapr 1.87e-5 torr

Solubility sol 1.4 mg/L

Kd Kd mg/L

Koc Koc 6040 mg/L

Photolysis half-life kdp 29.6 days Half-life

Aerobic Aquatic Metabolism kbacw 91.5 days Halfife

Anaerobic Aquatic Metabolism kbacs 63 days Halfife

Aerobic Soil Metabolism asm 109 days Halfife

Hydrolysis: pH 7 81 days Half-life

Method: CAM 1 integer See PRZM manual

Incorporation Depth: DEPI 0 cm

Application Rate:TAPP 1.1 kg/ha

Application Efficiency: APPEFF0.99 fraction

Spray Drift DRFT 0.01 fraction of application rate applied to pond

Application Date Date 4-12 dd/mm or dd/mmm or dd-mm or dd-mmm

Interval 1 interval 10 days Set to 0 or delete line for single app.

app. rate 1 apprate 1.1 kg/ha

Record 17: FILTRA

IPSCND1

UPTKF

Record 18: PLVKRT
103

PLDKRT

FEXTRC 0.5

Flag for Index Res. Run IR Reservoir

Flag for runoff calc. RUNOFF total none, monthly or total(average of entire run)

GA Peaches

stored as GA Peaches.out

Chemical: Chlorpyrifos

PRZM environment: GAPeachesSTD.txt modified Tueday, 29 May 2007 at 13:54:56

EXAMS environment: ir298.exv modified Thuday, 29 August 2002 at 16:34:12

Metfile: w03813.dvf modified Wedday, 3 July 2002 at 10:04:32

Water segment concentrations (ppb)

Year Peak 96 hr 21 Day 60 Day 90 Day Yearly

1961 12.62 11.65 7.188 2.574 1.747 0.4705

1962 13.77 12 7.569 4.384 3.46 1.461

1963 15.9 13.62 10.53 6.383 4.893 1.776

1964 7.345 6.358 3.949 2.425 2.056 1.295

1965 3.505 3.108 2.104 1.433 1.215 0.5392

1966 35.51 30.52 18.14 9.273 6.955 2.134

1967 4.153 3.614 2.797 2.327 2.078 1.116

1968 3.342 2.929 2.068 1.631 1.285 0.6434

1969 3.266 2.841 1.834 0.7751 0.6297 0.4518

1970 53.58 45.9 27.43 15.44 10.78 3.065

1971 10.78 9.848 7.95 5.997 5.19 2.419

1972 13.02 11.24 7.394 3.588 2.545 1.302

1973 5.252 4.767 3.471 2.394 2 0.8091

1974 21.66 18.61 11.04 5.66 4.285 1.34

1975 11.1 9.593 6.401 4.496 3.735 1.696

1976 16.01 13.73 8.156 4.71 3.918 1.465

1977 6.219 5.497 3.354 1.798 1.405 0.864

1978 4.628 4.054 2.619 1.649 1.375 0.76

1979 18.24 15.59 9.525 5.249 4.31 1.671

1980 11.39 9.808 5.89 3.22 2.473 1.13

1981 8.165 7.45 5.01 2.781 2.164 1.375

1982 5.872 5.054 3.534 2.008 1.751 1.201

1983 15.76 13.57 8.877 4.441 3.014 1.295

1984 3.53 3.06 2.04 1.719 1.535 0.7918

1985 5.919 5.126 3.149 1.75 1.423 0.859

1986 67.83 58.32 35.04 17.96 14.25 4.176

1987 8.683 7.52 4.687 3.595 3.259 1.767

1988 17.97 16.28 11.59 7.385 5.734 1.966

1989 11.06 9.556 5.776 3.166 3.249 1.593

1990 32.44 27.87 16.61 8.589 6.163 2.089

Sorted results

Prob. Peak 96 hr 21 Day 60 Day 90 Day Yearly

0.032258064516129 67.83 58.32 35.04 17.96 14.25 4.176

0.0645161290322581 53.58 45.9 27.43 15.44 10.78 3.065

0.0967741935483871 35.51 30.52 18.14 9.273 6.955 2.419

0.129032258064516 32.44 27.87 16.61 8.589 6.163 2.134

0.161290322580645 21.66 18.61 11.59 7.385 5.734 2.089

0.193548387096774 18.24 16.28 11.04 6.383 5.19 1.966

0.225806451612903 17.97 15.59 10.53 5.997 4.893 1.776

0.258064516129032 16.01 13.73 9.525 5.66 4.31 1.767

0.290322580645161 15.9 13.62 8.877 5.249 4.285 1.696
104

0.32258064516129 15.76 13.57 8.156 4.71 3.918 1.671

0.354838709677419 13.77 12 7.95 4.496 3.735 1.593

0.387096774193548 13.02 11.65 7.569 4.441 3.46 1.465

0.419354838709677 12.62 11.24 7.394 4.384 3.259 1.461

0.451612903225806 11.39 9.848 7.188 3.595 3.249 1.375

0.483870967741936 11.1 9.808 6.401 3.588 3.014 1.34

0.516129032258065 11.06 9.593 5.89 3.22 2.545 1.302

0.548387096774194 10.78 9.556 5.776 3.166 2.473 1.295

0.580645161290323 8.683 7.52 5.01 2.781 2.164 1.295

0.612903225806452 8.165 7.45 4.687 2.574 2.078 1.201

0.645161290322581 7.345 6.358 3.949 2.425 2.056 1.13

0.67741935483871 6.219 5.497 3.534 2.394 2 1.116

0.709677419354839 5.919 5.126 3.471 2.327 1.751 0.864

0.741935483870968 5.872 5.054 3.354 2.008 1.747 0.859

0.774193548387097 5.252 4.767 3.149 1.798 1.535 0.8091

0.806451612903226 4.628 4.054 2.797 1.75 1.423 0.7918

0.838709677419355 4.153 3.614 2.619 1.719 1.405 0.76

0.870967741935484 3.53 3.108 2.104 1.649 1.375 0.6434

0.903225806451613 3.505 3.06 2.068 1.631 1.285 0.5392

0.935483870967742 3.342 2.929 2.04 1.433 1.215 0.4705

0.967741935483871 3.266 2.841 1.834 0.7751 0.6297 0.4518

0.1 35.203 30.255 17.987 9.2046 6.8758 2.3905

Average of yearly averages: 1.45069333333333

Inputs generated by pe5.pl - Novemeber 2006

Data used for this run:

Output File: GA Peaches

Metfile: w03813.dvf

PRZM scenario: GAPeachesSTD.txt

EXAMS environment file: ir298.exv

Chemical Name: Chlorpyrifos

Description Variable Name Value Units Comments

Molecular weightmwt 350.6 g/mol

Henry's Law Const. henry 6.2e-6 atm-m^3/mol

Vapor Pressure vapr 1.87e-5 torr

Solubility sol 1.4 mg/L

Kd Kd mg/L

Koc Koc 6040 mg/L

Photolysis half-life kdp 29.6 days Half-life

Aerobic Aquatic Metabolism kbacw 91.5 days Halfife

Anaerobic Aquatic Metabolism kbacs 63 days Halfife

Aerobic Soil Metabolism asm 109 days Halfife

Hydrolysis: pH 7 81 days Half-life

Method: CAM 1 integer See PRZM manual

Incorporation Depth: DEPI 0 cm

Application Rate:TAPP 3.3 kg/ha

Application Efficiency: APPEFF0.99 fraction

Spray Drift DRFT 0.01 fraction of application rate applied to pond

Application Date Date 31-08 dd/mm or dd/mmm or dd-mm or dd-mmm

Record 17: FILTRA

IPSCND1

UPTKF

Record 18: PLVKRT

PLDKRT
105

FEXTRC 0.5

Flag for Index Res. Run IR Reservoir

Flag for runoff calc. RUNOFF total none, monthly or total(average of entire run)

NC Peanut(incorporated)

stored as NC Peanut--final 5-31 incorp.out

Chemical: Chlorpyrifos

PRZM environment: NCpeanutSTD.txt modified Tueday, 29 May 2007 at 13:58:46

EXAMS environment: ir298.exv modified Thuday, 29 August 2002 at 16:34:12

Metfile: w13722.dvf modified Wedday, 3 July 2002 at 10:05:50

Water segment concentrations (ppb)

Year Peak 96 hr 21 Day 60 Day 90 Day Yearly

1961 0.9114 0.7997 0.6107 0.4312 0.4143 0.1748

1962 3.598 3.137 2.218 1.86 1.5 0.6427

1963 2.271 1.963 1.192 0.6767 0.499 0.3216

1964 1.577 1.383 1.094 0.9471 0.7664 0.4611

1965 9.276 8.134 6.139 3.82 2.97 1.051

1966 4.131 3.599 2.345 1.453 1.209 0.5791

1967 8.315 7.212 4.788 2.762 2.218 0.8157

1968 1.828 1.607 1.055 0.7838 0.6814 0.4189

1969 2.899 2.525 1.644 1.114 1.03 0.5034

1970 2.485 2.156 1.453 0.9469 0.7426 0.3698

1971 1.467 1.289 1.084 0.7397 0.6621 0.3949

1972 5.001 4.349 2.807 2.012 1.645 0.6934

1973 7.689 6.736 5.187 3.058 2.381 0.9246

1974 1.234 1.086 0.7136 0.5195 0.4974 0.3543

1975 3.915 3.441 2.269 1.248 1.021 0.49

1976 1.169 1.022 0.7685 0.5272 0.4407 0.305

1977 1.672 1.454 0.9104 0.5956 0.5495 0.3142

1978 2.758 2.41 1.711 1.396 1.149 0.5233

1979 2.6 2.284 1.603 1.119 0.949 0.5246

1980 6.485 5.613 3.46 1.888 1.487 0.6048

1981 2.599 2.289 1.562 1.048 0.8837 0.466

1982 7.785 6.795 4.458 2.75 2.144 0.8188

1983 1.363 1.202 0.8801 0.5665 0.4476 0.3402

1984 2.809 2.64 1.867 1.155 0.9392 0.4597

1985 1.616 1.417 1.132 0.9233 0.8234 0.4257

1986 3.575 3.078 1.982 1.122 0.892 0.4173

1987 1.72 1.494 1.24 0.7424 0.6601 0.4092

1988 0.8861 0.7684 0.5912 0.4107 0.4181 0.2656

1989 4.674 4.088 2.65 1.587 1.335 0.5615

1990 1.004 0.8969 0.5964 0.3391 0.2723 0.2124

Sorted results

Prob. Peak 96 hr 21 Day 60 Day 90 Day Yearly

0.032258064516129 9.276 8.134 6.139 3.82 2.97 1.051

0.0645161290322581 8.315 7.212 5.187 3.058 2.381 0.9246

0.0967741935483871 7.785 6.795 4.788 2.762 2.218 0.8188

0.129032258064516 7.689 6.736 4.458 2.75 2.144 0.8157

0.161290322580645 6.485 5.613 3.46 2.012 1.645 0.6934

0.193548387096774 5.001 4.349 2.807 1.888 1.5 0.6427

0.225806451612903 4.674 4.088 2.65 1.86 1.487 0.6048

0.258064516129032 4.131 3.599 2.345 1.587 1.335 0.5791

0.290322580645161 3.915 3.441 2.269 1.453 1.209 0.5615

0.32258064516129 3.598 3.137 2.218 1.396 1.149 0.5246
106

0.354838709677419 3.575 3.078 1.982 1.248 1.03 0.5233

0.387096774193548 2.899 2.64 1.867 1.155 1.021 0.5034

0.419354838709677 2.809 2.525 1.711 1.122 0.949 0.49

0.451612903225806 2.758 2.41 1.644 1.119 0.9392 0.466

0.483870967741936 2.6 2.289 1.603 1.114 0.892 0.4611

0.516129032258065 2.599 2.284 1.562 1.048 0.8837 0.4597

0.548387096774194 2.485 2.156 1.453 0.9471 0.8234 0.4257

0.580645161290323 2.271 1.963 1.24 0.9469 0.7664 0.4189

0.612903225806452 1.828 1.607 1.192 0.9233 0.7426 0.4173

0.645161290322581 1.72 1.494 1.132 0.7838 0.6814 0.4092

0.67741935483871 1.672 1.454 1.094 0.7424 0.6621 0.3949

0.709677419354839 1.616 1.417 1.084 0.7397 0.6601 0.3698

0.741935483870968 1.577 1.383 1.055 0.6767 0.5495 0.3543

0.774193548387097 1.467 1.289 0.9104 0.5956 0.499 0.3402

0.806451612903226 1.363 1.202 0.8801 0.5665 0.4974 0.3216

0.838709677419355 1.234 1.086 0.7685 0.5272 0.4476 0.3142

0.870967741935484 1.169 1.022 0.7136 0.5195 0.4407 0.305

0.903225806451613 1.004 0.8969 0.6107 0.4312 0.4181 0.2656

0.935483870967742 0.9114 0.7997 0.5964 0.4107 0.4143 0.2124

0.967741935483871 0.8861 0.7684 0.5912 0.3391 0.2723 0.1748

0.1 7.7754 6.7891 4.755 2.7608 2.2106 0.81849

Average of yearly averages: 0.494786666666667

Inputs generated by pe5.pl - Novemeber 2006

Data used for this run:

Output File: NC Peanut--final 5-31 incorp

Metfile: w13722.dvf

PRZM scenario: NCpeanutSTD.txt

EXAMS environment file: ir298.exv

Chemical Name: Chlorpyrifos

Description Variable Name Value Units Comments

Molecular weightmwt 350.6 g/mol

Henry's Law Const. henry 6.2e-6 atm-m^3/mol

Vapor Pressure vapr 1.87e-5 torr

Solubility sol 1.4 mg/L

Kd Kd mg/L

Koc Koc 6040 mg/L

Photolysis half-life kdp 29.6 days Half-life

Aerobic Aquatic Metabolism kbacw 91.5 days Halfife

Anaerobic Aquatic Metabolism kbacs 63 days Halfife

Aerobic Soil Metabolism asm 109 days Halfife

Hydrolysis: pH 7 81 days Half-life

Method: CAM 4 integer See PRZM manual

Incorporation Depth: DEPI 7.6 cm

Application Rate:TAPP 2.2 kg/ha

Application Efficiency: APPEFF0.99 fraction

Spray Drift DRFT 0.01 fraction of application rate applied to pond

Application Date Date 31-5 dd/mm or dd/mmm or dd-mm or dd-mmm

Record 17: FILTRA

IPSCND1

UPTKF

Record 18: PLVKRT

PLDKRT

FEXTRC 0.5
107

Flag for Index Res. Run IR Reservoir

Flag for runoff calc. RUNOFF total none, monthly or total(average of entire run)

NC Peanut

stored as NC Peanut--aerial 5_31.out

Chemical: Chlorpyrifos

PRZM environment: NCpeanutSTD.txt modified Tueday, 29 May 2007 at 13:58:46

EXAMS environment: ir298.exv modified Thuday, 29 August 2002 at 16:34:12

Metfile: w13722.dvf modified Wedday, 3 July 2002 at 10:05:50

Water segment concentrations (ppb)

Year Peak 96 hr 21 Day 60 Day 90 Day Yearly

1961 7.18 6.296 4.859 3.245 3.152 1.254

1962 29.2 25.41 17.75 14.32 11.29 4.686

1963 14.86 12.86 7.845 4.485 3.327 2.266

1964 11.94 10.44 7.459 6.435 5.23 3.237

1965 64.02 56.28 42.2 26.28 20.5 7.236

1966 30.54 26.6 17.28 10.57 8.773 4.091

1967 60.48 52.48 34.77 20.05 16.03 5.839

1968 13.48 11.86 7.878 5.957 5.061 3.01

1969 12.98 11.33 7.903 5.902 5.652 2.991

1970 17.84 15.49 10.41 6.717 5.269 2.545

1971 10.69 9.408 7.847 5.274 4.661 2.716

1972 36.64 31.86 20.55 14.47 11.78 4.856

1973 54.13 47.59 36.8 21.72 16.92 6.518

1974 8.345 7.357 4.877 3.557 3.503 2.464

1975 27.87 24.55 16.22 8.962 7.292 3.399

1976 7.748 6.772 5.107 3.497 2.924 2.016

1977 11.08 9.649 6.074 3.984 3.686 2.133

1978 17.13 15.09 10.32 8.724 7.136 3.357

1979 10.95 9.686 8.15 6.391 5.508 3.274

1980 47.92 41.5 25.65 14.03 11.02 4.362

1981 19.68 17.37 11.89 7.851 6.563 3.357

1982 65.06 56.7 35.84 21 16.43 6.212

1983 8.052 7.101 5.151 3.408 2.851 2.298

1984 19.1 17.92 12.73 8.001 6.516 3.149

1985 12.66 11.07 8.627 6.758 5.962 2.963

1986 23.27 20.06 12.97 7.414 5.989 2.832

1987 12.33 10.76 8.157 4.924 4.656 2.795

1988 5.817 5.102 4.015 2.79 2.825 1.81

1989 16.86 14.78 11.68 7.608 6.716 3.077

1990 6.489 5.804 3.87 2.211 1.78 1.381

Sorted results

Prob. Peak 96 hr 21 Day 60 Day 90 Day Yearly

0.032258064516129 65.06 56.7 42.2 26.28 20.5 7.236

0.0645161290322581 64.02 56.28 36.8 21.72 16.92 6.518

0.0967741935483871 60.48 52.48 35.84 21 16.43 6.212

0.129032258064516 54.13 47.59 34.77 20.05 16.03 5.839

0.161290322580645 47.92 41.5 25.65 14.47 11.78 4.856

0.193548387096774 36.64 31.86 20.55 14.32 11.29 4.686

0.225806451612903 30.54 26.6 17.75 14.03 11.02 4.362

0.258064516129032 29.2 25.41 17.28 10.57 8.773 4.091

0.290322580645161 27.87 24.55 16.22 8.962 7.292 3.399

0.32258064516129 23.27 20.06 12.97 8.724 7.136 3.357

0.354838709677419 19.68 17.92 12.73 8.001 6.716 3.357
108

0.387096774193548 19.1 17.37 11.89 7.851 6.563 3.274

0.419354838709677 17.84 15.49 11.68 7.608 6.516 3.237

0.451612903225806 17.13 15.09 10.41 7.414 5.989 3.149

0.483870967741936 16.86 14.78 10.32 6.758 5.962 3.077

0.516129032258065 14.86 12.86 8.627 6.717 5.652 3.01

0.548387096774194 13.48 11.86 8.157 6.435 5.508 2.991

0.580645161290323 12.98 11.33 8.15 6.391 5.269 2.963

0.612903225806452 12.66 11.07 7.903 5.957 5.23 2.832

0.645161290322581 12.33 10.76 7.878 5.902 5.061 2.795

0.67741935483871 11.94 10.44 7.847 5.274 4.661 2.716

0.709677419354839 11.08 9.686 7.845 4.924 4.656 2.545

0.741935483870968 10.95 9.649 7.459 4.485 3.686 2.464

0.774193548387097 10.69 9.408 6.074 3.984 3.503 2.298

0.806451612903226 8.345 7.357 5.151 3.557 3.327 2.266

0.838709677419355 8.052 7.101 5.107 3.497 3.152 2.133

0.870967741935484 7.748 6.772 4.877 3.408 2.924 2.016

0.903225806451613 7.18 6.296 4.859 3.245 2.851 1.81

0.935483870967742 6.489 5.804 4.015 2.79 2.825 1.381

0.967741935483871 5.817 5.102 3.87 2.211 1.78 1.254

0.1 59.845 51.991 35.733 20.905 16.39 6.1747

Average of yearly averages: 3.40413333333333

Inputs generated by pe5.pl - Novemeber 2006

Data used for this run:

Output File: NC Peanut--aerial 5_31

Metfile: w13722.dvf

PRZM scenario: NCpeanutSTD.txt

EXAMS environment file: ir298.exv

Chemical Name: Chlorpyrifos

Description Variable Name Value Units Comments

Molecular weightmwt 350.6 g/mol

Henry's Law Const. henry 6.2e-6 atm-m^3/mol

Vapor Pressure vapr 1.87e-5 torr

Solubility sol 1.4 mg/L

Kd Kd mg/L

Koc Koc 6040 mg/L

Photolysis half-life kdp 29.6 days Half-life

Aerobic Aquatic Metabolism kbacw 91.5 days Halfife

Anaerobic Aquatic Metabolism kbacs 63 days Halfife

Aerobic Soil Metabolism asm 109 days Halfife

Hydrolysis: pH 7 81 days Half-life

Method: CAM 1 integer See PRZM manual

Incorporation Depth: DEPI 0 cm

Application Rate:TAPP 2.2 kg/ha

Application Efficiency: APPEFF0.95 fraction

Spray Drift DRFT 0.039 fraction of application rate applied to pond

Application Date Date 31-05 dd/mm or dd/mmm or dd-mm or dd-mmm

Interval 1 interval 10 days Set to 0 or delete line for single app.

app. rate 1 apprate 2.2 kg/ha

Record 17: FILTRA

IPSCND1

UPTKF

Record 18: PLVKRT

PLDKRT
109

FEXTRC 0.5

Flag for Index Res. Run IR Reservoir

Flag for runoff calc. RUNOFF total none, monthly or total(average of entire run)

GA Pecans

stored as GAPecans_foliar and floor.out

Chemical: Chlorpyrifos

PRZM environment: GAPecansSTD.txt modified Tueday, 29 May 2007 at 13:55:08

EXAMS environment: ir298.exv modified Thuday, 29 August 2002 at 16:34:12

Metfile: w93805.dvf modified Wedday, 3 July 2002 at 10:04:32

Water segment concentrations (ppb)

Year Peak 96 hr 21 Day 60 Day 90 Day Yearly

1961 35.47 30.53 19.46 11.7 9.597 3.262

1962 33.71 28.96 17.37 11.9 9.815 4.947

1963 44.72 38.42 23.86 15.28 14.8 6.731

1964 196 168 112 62.9 50.02 20.38

1965 82.52 72.49 46.92 39.95 34.23 15.8

1966 44.78 38.91 27.49 21.05 19.13 9.552

1967 19.98 17.49 12.42 8.918 8.688 6.027

1968 62.77 54.05 32.89 20.3 17.39 7.017

1969 111 99.74 66.95 38.09 40.4 15.82

1970 165 142 85.43 47.12 36.95 14.94

1971 54.78 47.52 39.69 23.78 19.04 8.677

1972 81.85 70.49 47.45 25.79 20.72 9.317

1973 29.2 26.03 18.49 12.08 9.693 7.067

1974 46.9 40.88 26.77 23.21 19.11 7.407

1975 116 99.62 63.37 35.39 27.97 11.84

1976 52.76 45.78 29.84 20.35 17.67 9.865

1977 40.31 34.76 27.11 17.89 13.85 7.194

1978 58.79 50.8 35.49 21.91 16.54 6.875

1979 72.69 62.82 52.21 32.68 26.48 11.55

1980 89.16 76.92 47.5 25.02 19.3 9.074

1981 17.35 15.23 9.579 7.386 6.207 4.401

1982 81.76 70.86 45.17 32.35 26.12 9.702

1983 19.68 17.19 12.54 7.58 5.731 4.564

1984 18.12 15.88 10.52 8.824 7.741 4.755

1985 49.9 43.24 26.88 22.98 19.65 9.272

1986 50.1 43.95 33.11 27.89 26.03 11.84

1987 45.4 40.54 27.71 20.11 20.38 9.434

1988 13.52 12.58 10.6 7.392 6.826 5.1

1989 46.74 40.56 33.89 21.89 17.02 7.524

1990 18.64 16.25 10.6 8.202 8.004 4.65

Sorted results

Prob. Peak 96 hr 21 Day 60 Day 90 Day Yearly

0.032258064516129 196 168 112 62.9 50.02 20.38

0.0645161290322581 165 142 85.43 47.12 40.4 15.82

0.0967741935483871 116 99.74 66.95 39.95 36.95 15.8

0.129032258064516 111 99.62 63.37 38.09 34.23 14.94

0.161290322580645 89.16 76.92 52.21 35.39 27.97 11.84

0.193548387096774 82.52 72.49 47.5 32.68 26.48 11.84

0.225806451612903 81.85 70.86 47.45 32.35 26.12 11.55

0.258064516129032 81.76 70.49 46.92 27.89 26.03 9.865

0.290322580645161 72.69 62.82 45.17 25.79 20.72 9.702

0.32258064516129 62.77 54.05 39.69 25.02 20.38 9.552
110

0.354838709677419 58.79 50.8 35.49 23.78 19.65 9.434

0.387096774193548 54.78 47.52 33.89 23.21 19.3 9.317

0.419354838709677 52.76 45.78 33.11 22.98 19.13 9.272

0.451612903225806 50.1 43.95 32.89 21.91 19.11 9.074

0.483870967741936 49.9 43.24 29.84 21.89 19.04 8.677

0.516129032258065 46.9 40.88 27.71 21.05 17.67 7.524

0.548387096774194 46.74 40.56 27.49 20.35 17.39 7.407

0.580645161290323 45.4 40.54 27.11 20.3 17.02 7.194

0.612903225806452 44.78 38.91 26.88 20.11 16.54 7.067

0.645161290322581 44.72 38.42 26.77 17.89 14.8 7.017

0.67741935483871 40.31 34.76 23.86 15.28 13.85 6.875

0.709677419354839 35.47 30.53 19.46 12.08 9.815 6.731

0.741935483870968 33.71 28.96 18.49 11.9 9.693 6.027

0.774193548387097 29.2 26.03 17.37 11.7 9.597 5.1

0.806451612903226 19.98 17.49 12.54 8.918 8.688 4.947

0.838709677419355 19.68 17.19 12.42 8.824 8.004 4.755

0.870967741935484 18.64 16.25 10.6 8.202 7.741 4.65

0.903225806451613 18.12 15.88 10.6 7.58 6.826 4.564

0.935483870967742 17.35 15.23 10.52 7.392 6.207 4.401

0.967741935483871 13.52 12.58 9.579 7.386 5.731 3.262

0.1 115.5 99.728 66.592 39.764 36.678 15.714

Average of yearly averages: 8.81946666666667

Inputs generated by pe5.pl - Novemeber 2006

Data used for this run:

Output File: GAPecans_foliar and floor

Metfile: w93805.dvf

PRZM scenario: GAPecansSTD.txt

EXAMS environment file: ir298.exv

Chemical Name: Chlorpyrifos

Description Variable Name Value Units Comments

Molecular weightmwt 350.6 g/mol

Henry's Law Const. henry 6.2e-6 atm-m^3/mol

Vapor Pressure vapr 1.87e-5 torr

Solubility sol 1.4 mg/L

Kd Kd mg/L

Koc Koc 6040 mg/L

Photolysis half-life kdp 29.6 days Half-life

Aerobic Aquatic Metabolism kbacw 91.5 days Halfife

Anaerobic Aquatic Metabolism kbacs 63 days Halfife

Aerobic Soil Metabolism asm 109 days Halfife

Hydrolysis: pH 7 81 days Half-life

Method: CAM 2 integer See PRZM manual

Incorporation Depth: DEPI 0 cm

Application Rate:TAPP 4.5 kg/ha

Application Efficiency: APPEFF0.99 fraction

Spray Drift DRFT 0.01 fraction of application rate applied to pond

Application Date Date 15-06 dd/mm or dd/mmm or dd-mm or dd-mmm

Interval 1 interval 10 days Set to 0 or delete line for single app.

app. rate 1 apprate 2.2 kg/ha

Interval 2 interval 10 days Set to 0 or delete line for single app.

app. rate 2 apprate 2.2 kg/ha

Interval 3 interval 10 days Set to 0 or delete line for single app.

app. rate 3 apprate 2.2 kg/ha
111

Record 17: FILTRA

IPSCND1

UPTKF

Record 18: PLVKRT

PLDKRT

FEXTRC 0.5

Flag for Index Res. Run IR Reservoir

Flag for runoff calc. RUNOFF total none, monthly or total(average of entire run)

KS Sorghum

stored as KS sorghum_ground.out

Chemical: Chlorpyrifos

PRZM environment: KSsorghumSTD.txt modified Tueday, 29 May 2007 at 13:55:46

EXAMS environment: ir298.exv modified Thuday, 29 August 2002 at 16:34:12

Metfile: w13996.dvf modified Wedday, 3 July 2002 at 10:04:44

Water segment concentrations (ppb)

Year Peak 96 hr 21 Day 60 Day 90 Day Yearly

1961 6.275 5.502 4.163 2.934 2.53 1.115

1962 6.204 5.429 3.6 2.769 2.866 1.396

1963 8.1 7.024 4.372 2.751 2.249 1.015

1964 11.49 9.98 7.898 4.567 4.063 1.733

1965 15.01 13.4 9.366 6.089 4.918 2.187

1966 13.2 11.69 8.663 5.324 4.261 1.736

1967 29.94 26.57 18.35 11.8 9.292 3.53

1968 12.1 10.79 9.131 6.127 5.486 2.652

1969 12.77 11.27 9.956 6.329 4.922 2.138

1970 8.705 7.592 5.308 3.4 2.71 1.406

1971 4.452 3.871 2.719 1.94 1.566 0.9174

1972 3.929 3.448 2.248 1.72 1.702 0.979

1973 15.21 13.19 8.607 5.414 5.109 2.438

1974 5.822 5.274 3.78 2.764 2.439 1.565

1975 5.565 4.849 3.708 2.223 1.756 0.9869

1976 2.276 2.045 1.376 1.209 1.035 0.5813

1977 26.99 23.42 15.66 9.054 7.454 2.767

1978 15.38 14.08 9.123 6.286 5.296 2.475

1979 12.54 10.95 7.957 4.923 4.195 1.966

1980 5.888 5.161 3.639 2.365 2.139 1.433

1981 11.74 10.68 8.081 6.56 5.446 2.309

1982 9.607 8.447 6.593 4.724 4.074 1.88

1983 10.59 9.495 6.07 3.719 2.901 1.376

1984 27.06 23.34 16.01 8.789 6.749 2.453

1985 6.161 5.679 3.968 2.955 2.993 1.758

1986 5.618 4.921 3.994 3.256 2.821 1.46

1987 8.389 7.368 5.235 3.592 3.052 1.367

1988 10.76 9.731 6.382 3.612 2.798 1.161

1989 8.428 7.504 5.236 4.494 4.518 1.963

1990 8.191 7.083 5.205 3.71 3.348 1.617

Sorted results

Prob. Peak 96 hr 21 Day 60 Day 90 Day Yearly

0.032258064516129 29.94 26.57 18.35 11.8 9.292 3.53

0.0645161290322581 27.06 23.42 16.01 9.054 7.454 2.767

0.0967741935483871 26.99 23.34 15.66 8.789 6.749 2.652

0.129032258064516 15.38 14.08 9.956 6.56 5.486 2.475

0.161290322580645 15.21 13.4 9.366 6.329 5.446 2.453
112

0.193548387096774 15.01 13.19 9.131 6.286 5.296 2.438

0.225806451612903 13.2 11.69 9.123 6.127 5.109 2.309

0.258064516129032 12.77 11.27 8.663 6.089 4.922 2.187

0.290322580645161 12.54 10.95 8.607 5.414 4.918 2.138

0.32258064516129 12.1 10.79 8.081 5.324 4.518 1.966

0.354838709677419 11.74 10.68 7.957 4.923 4.261 1.963

0.387096774193548 11.49 9.98 7.898 4.724 4.195 1.88

0.419354838709677 10.76 9.731 6.593 4.567 4.074 1.758

0.451612903225806 10.59 9.495 6.382 4.494 4.063 1.736

0.483870967741936 9.607 8.447 6.07 3.719 3.348 1.733

0.516129032258065 8.705 7.592 5.308 3.71 3.052 1.617

0.548387096774194 8.428 7.504 5.236 3.612 2.993 1.565

0.580645161290323 8.389 7.368 5.235 3.592 2.901 1.46

0.612903225806452 8.191 7.083 5.205 3.4 2.866 1.433

0.645161290322581 8.1 7.024 4.372 3.256 2.821 1.406

0.67741935483871 6.275 5.679 4.163 2.955 2.798 1.396

0.709677419354839 6.204 5.502 3.994 2.934 2.71 1.376

0.741935483870968 6.161 5.429 3.968 2.769 2.53 1.367

0.774193548387097 5.888 5.274 3.78 2.764 2.439 1.161

0.806451612903226 5.822 5.161 3.708 2.751 2.249 1.115

0.838709677419355 5.618 4.921 3.639 2.365 2.139 1.015

0.870967741935484 5.565 4.849 3.6 2.223 1.756 0.9869

0.903225806451613 4.452 3.871 2.719 1.94 1.702 0.979

0.935483870967742 3.929 3.448 2.248 1.72 1.566 0.9174

0.967741935483871 2.276 2.045 1.376 1.209 1.035 0.5813

0.1 25.829 22.414 15.0896 8.5661 6.6227 2.6343

Average of yearly averages: 1.74535333333333

Inputs generated by pe5.pl - Novemeber 2006

Data used for this run:

Output File: KS sorghum_ground

Metfile: w13996.dvf

PRZM scenario: KSsorghumSTD.txt

EXAMS environment file: ir298.exv

Chemical Name: Chlorpyrifos

Description Variable Name Value Units Comments

Molecular weightmwt 350.6 g/mol

Henry's Law Const. henry 6.2e-6 atm-m^3/mol

Vapor Pressure vapr 1.87e-5 torr

Solubility sol 1.4 mg/L

Kd Kd mg/L

Koc Koc 6040 mg/L

Photolysis half-life kdp 29.6 days Half-life

Aerobic Aquatic Metabolism kbacw 91.5 days Halfife

Anaerobic Aquatic Metabolism kbacs 63 days Halfife

Aerobic Soil Metabolism asm 109 days Halfife

Hydrolysis: pH 7 81 days Half-life

Method: CAM 2 integer See PRZM manual

Incorporation Depth: DEPI 0 cm

Application Rate:TAPP 0.56 kg/ha

Application Efficiency: APPEFF0.95 fraction

Spray Drift DRFT 0.039 fraction of application rate applied to pond

Application Date Date 30-05 dd/mm or dd/mmm or dd-mm or dd-mmm

Interval 1 interval 10 days Set to 0 or delete line for single app.
113

app. rate 1 apprate 0.56 kg/ha

Interval 2 interval 10 days Set to 0 or delete line for single app.

app. rate 2 apprate 0.56 kg/ha

Record 17: FILTRA

IPSCND1

UPTKF

Record 18: PLVKRT

PLDKRT

FEXTRC 0.5

Flag for Index Res. Run IR Reservoir

Flag for runoff calc. RUNOFF total none, monthly or total(average of entire run)

CA Strawberry

stored as CA Strawberries.out

Chemical: Chlorpyrifos

PRZM environment: CAfruit_WirrigSTD.txt modified Tueday, 29 May 2007 at 13:42:32

EXAMS environment: ir298.exv modified Thuday, 29 August 2002 at 16:34:12

Metfile: w93193.dvf modified Wedday, 3 July 2002 at 10:04:24

Water segment concentrations (ppb)

Year Peak 96 hr 21 Day 60 Day 90 Day Yearly

1961 3.089 2.706 2.23 1.557 1.187 0.3911

1962 11.41 10.31 7.107 4.031 3.108 1.01

1963 6.614 5.748 4.45 2.964 2.524 0.8571

1964 3.168 2.787 2.304 1.63 1.254 0.4238

1965 7.347 6.396 3.996 2.661 2.267 0.7767

1966 3.166 2.78 2.305 1.624 1.244 0.4335

1967 3.268 2.887 2.426 1.834 1.72 0.6403

1968 3.223 2.833 2.292 1.627 1.258 0.4206

1969 15.63 13.53 8.273 4.857 3.985 1.354

1970 5.096 4.493 3.021 2.405 1.904 0.6472

1971 3.154 2.732 2.265 1.58 1.336 0.4832

1972 3.144 2.758 2.289 1.601 1.22 0.4184

1973 5.788 5.035 3.828 2.432 1.88 0.6101

1974 3.155 2.744 2.276 1.604 1.23 0.4015

1975 3.118 2.717 2.248 1.575 1.209 0.3972

1976 10.63 9.231 6.294 3.673 2.826 0.9418

1977 3.187 2.775 2.31 1.624 1.246 0.414

1978 8.878 7.983 5.813 3.821 3.141 1.039

1979 3.2 2.967 2.391 1.709 1.308 0.4225

1980 11.44 9.897 6.254 3.791 2.974 0.9696

1981 5.044 4.364 3.268 2.13 1.64 0.5313

1982 3.137 2.751 2.269 1.826 1.609 0.5631

1983 4.579 3.976 3.121 2.506 1.989 0.7228

1984 3.241 2.848 2.35 1.654 1.263 0.4101

1985 3.221 2.837 2.335 1.653 1.266 0.4059

1986 7.873 6.807 4.875 3.526 2.8 0.902

1987 3.457 3.031 2.458 1.795 1.4 0.4639

1988 3.146 2.768 2.269 1.657 1.403 0.4944

1989 3.166 2.786 2.298 2.065 1.788 0.6042

1990 3.184 2.772 2.32 1.626 1.262 0.4803

Sorted results

Prob. Peak 96 hr 21 Day 60 Day 90 Day Yearly

0.032258064516129 15.63 13.53 8.273 4.857 3.985 1.354

0.0645161290322581 11.44 10.31 7.107 4.031 3.141 1.039
114

0.0967741935483871 11.41 9.897 6.294 3.821 3.108 1.01

0.129032258064516 10.63 9.231 6.254 3.791 2.974 0.9696

0.161290322580645 8.878 7.983 5.813 3.673 2.826 0.9418

0.193548387096774 7.873 6.807 4.875 3.526 2.8 0.902

0.225806451612903 7.347 6.396 4.45 2.964 2.524 0.8571

0.258064516129032 6.614 5.748 3.996 2.661 2.267 0.7767

0.290322580645161 5.788 5.035 3.828 2.506 1.989 0.7228

0.32258064516129 5.096 4.493 3.268 2.432 1.904 0.6472

0.354838709677419 5.044 4.364 3.121 2.405 1.88 0.6403

0.387096774193548 4.579 3.976 3.021 2.13 1.788 0.6101

0.419354838709677 3.457 3.031 2.458 2.065 1.72 0.6042

0.451612903225806 3.268 2.967 2.426 1.834 1.64 0.5631

0.483870967741936 3.241 2.887 2.391 1.826 1.609 0.5313

0.516129032258065 3.223 2.848 2.35 1.795 1.403 0.4944

0.548387096774194 3.221 2.837 2.335 1.709 1.4 0.4832

0.580645161290323 3.2 2.833 2.32 1.657 1.336 0.4803

0.612903225806452 3.187 2.787 2.31 1.654 1.308 0.4639

0.645161290322581 3.184 2.786 2.305 1.653 1.266 0.4335

0.67741935483871 3.168 2.78 2.304 1.63 1.263 0.4238

0.709677419354839 3.166 2.775 2.298 1.627 1.262 0.4225

0.741935483870968 3.166 2.772 2.292 1.626 1.258 0.4206

0.774193548387097 3.155 2.768 2.289 1.624 1.254 0.4184

0.806451612903226 3.154 2.758 2.276 1.624 1.246 0.414

0.838709677419355 3.146 2.751 2.269 1.604 1.244 0.4101

0.870967741935484 3.144 2.744 2.269 1.601 1.23 0.4059

0.903225806451613 3.137 2.732 2.265 1.58 1.22 0.4015

0.935483870967742 3.118 2.717 2.248 1.575 1.209 0.3972

0.967741935483871 3.089 2.706 2.23 1.557 1.187 0.3911

0.1 11.332 9.8304 6.29 3.818 3.0946 1.00596

Average of yearly averages: 0.620986666666667

Inputs generated by pe5.pl - Novemeber 2006

Data used for this run:

Output File: CA Strawberries

Metfile: w93193.dvf

PRZM scenario: CAfruit_WirrigSTD.txt

EXAMS environment file: ir298.exv

Chemical Name: Chlorpyrifos

Description Variable Name Value Units Comments

Molecular weightmwt 350.6 g/mol

Henry's Law Const. henry 6.2e-6 atm-m^3/mol

Vapor Pressure vapr 1.87e-5 torr

Solubility sol 1.4 mg/L

Kd Kd mg/L

Koc Koc 6040 mg/L

Photolysis half-life kdp 29.6 days Half-life

Aerobic Aquatic Metabolism kbacw 91.5 days Halfife

Anaerobic Aquatic Metabolism kbacs 63 days Halfife

Aerobic Soil Metabolism asm 109 days Halfife

Hydrolysis: pH 7 81 days Half-life

Method: CAM 2 integer See PRZM manual

Incorporation Depth: DEPI 0 cm

Application Rate:TAPP 2.2 kg/ha

Application Efficiency: APPEFF0.95 fraction
115

Spray Drift DRFT 0.039 fraction of application rate applied to pond

Application Date Date 29-01 dd/mm or dd/mmm or dd-mm or dd-mmm

Interval 1 interval 10 days Set to 0 or delete line for single app.

app. rate 1 apprate 1.1 kg/ha

Interval 2 interval 10 days Set to 0 or delete line for single app.

app. rate 2 apprate 1.1 kg/ha

Record 17: FILTRA

IPSCND1

UPTKF

Record 18: PLVKRT

PLDKRT

FEXTRC 0.5

Flag for Index Res. Run IR Reservoir

Flag for runoff calc. RUNOFF total none, monthly or total(average of entire run)

FL Strawberry

stored as FL Strawberries.out

Chemical: Chlorpyrifos

PRZM environment: FLstrawberry_WirrigSTD.txt modified Tueday, 29 May 2007 at 13:53:40

EXAMS environment: ir298.exv modified Thuday, 29 August 2002 at 16:34:12

Metfile: w12842.dvf modified Wedday, 3 July 2002 at 10:04:28

Water segment concentrations (ppb)

Year Peak 96 hr 21 Day 60 Day 90 Day Yearly

1961 13.04 11.72 8.355 5.599 4.649 2.228

1962 13.89 11.96 8.213 5.302 4.45 3.02

1963 22.17 19.26 15.41 10.78 8.286 3.91

1964 18.81 16.27 10.19 8.369 7.739 5.062

1965 13.35 11.46 8.545 6.626 6.098 3.218

1966 16.61 15.39 9.467 6.966 5.964 3.098

1967 14.33 12.77 9.051 7.431 6.513 3.334

1968 14.04 12.17 8.56 6.264 5.464 2.855

1969 21.32 19.46 14.58 9.106 8.275 4.988

1970 18 15.62 11.4 8.555 7.258 3.587

1971 22.63 19.36 11.45 6.38 5.935 4.058

1972 13.32 11.45 8.167 6.121 6.002 3.574

1973 24.32 20.83 12.82 6.859 5.574 3.334

1974 35.26 30.18 18.3 9.8 7.664 3.288

1975 14.5 12.45 8.775 6.692 5.507 2.766

1976 22.83 20.59 13.43 9.88 8.011 3.607

1977 6.105 5.367 4.087 3.193 2.645 1.709

1978 26.35 23.21 15.49 9.508 7.615 3.493

1979 79.95 70.23 43.76 23.11 18.06 7.972

1980 15.41 13.37 8.651 6.605 6.014 3.459

1981 30.58 26.22 16.09 9.134 7.121 4.177

1982 17.59 15.82 12.08 10.91 9.231 4.612

1983 22.1 19.26 14.94 12.38 11 5.764

1984 12.6 10.86 6.958 4.68 4.522 2.817

1985 18.09 15.49 9.712 7.345 7.325 3.601

1986 24.87 21.43 13.5 7.631 6.211 3.343

1987 45.21 39.11 25.03 15.35 12.72 5.369

1988 15.88 13.83 9.561 7.168 6.019 3.652

1989 9.676 8.839 6.354 5.717 5.487 2.598

1990 16.7 14.45 11.22 7.334 5.985 3.299

Sorted results
116

Prob. Peak 96 hr 21 Day 60 Day 90 Day Yearly

0.032258064516129 79.95 70.23 43.76 23.11 18.06 7.972

0.0645161290322581 45.21 39.11 25.03 15.35 12.72 5.764

0.0967741935483871 35.26 30.18 18.3 12.38 11 5.369

0.129032258064516 30.58 26.22 16.09 10.91 9.231 5.062

0.161290322580645 26.35 23.21 15.49 10.78 8.286 4.988

0.193548387096774 24.87 21.43 15.41 9.88 8.275 4.612

0.225806451612903 24.32 20.83 14.94 9.8 8.011 4.177

0.258064516129032 22.83 20.59 14.58 9.508 7.739 4.058

0.290322580645161 22.63 19.46 13.5 9.134 7.664 3.91

0.32258064516129 22.17 19.36 13.43 9.106 7.615 3.652

0.354838709677419 22.1 19.26 12.82 8.555 7.325 3.607

0.387096774193548 21.32 19.26 12.08 8.369 7.258 3.601

0.419354838709677 18.81 16.27 11.45 7.631 7.121 3.587

0.451612903225806 18.09 15.82 11.4 7.431 6.513 3.574

0.483870967741936 18 15.62 11.22 7.345 6.211 3.493

0.516129032258065 17.59 15.49 10.19 7.334 6.098 3.459

0.548387096774194 16.7 15.39 9.712 7.168 6.019 3.343

0.580645161290323 16.61 14.45 9.561 6.966 6.014 3.334

0.612903225806452 15.88 13.83 9.467 6.859 6.002 3.334

0.645161290322581 15.41 13.37 9.051 6.692 5.985 3.299

0.67741935483871 14.5 12.77 8.775 6.626 5.964 3.288

0.709677419354839 14.33 12.45 8.651 6.605 5.935 3.218

0.741935483870968 14.04 12.17 8.56 6.38 5.574 3.098

0.774193548387097 13.89 11.96 8.545 6.264 5.507 3.02

0.806451612903226 13.35 11.72 8.355 6.121 5.487 2.855

0.838709677419355 13.32 11.46 8.213 5.717 5.464 2.817

0.870967741935484 13.04 11.45 8.167 5.599 4.649 2.766

0.903225806451613 12.6 10.86 6.958 5.302 4.522 2.598

0.935483870967742 9.676 8.839 6.354 4.68 4.45 2.228

0.967741935483871 6.105 5.367 4.087 3.193 2.645 1.709

0.1 34.792 29.784 18.079 12.233 10.8231 5.3383

Average of yearly averages: 3.7264

Inputs generated by pe5.pl - Novemeber 2006

Data used for this run:

Output File: FL Strawberries

Metfile: w12842.dvf

PRZM scenario: FLstrawberry_WirrigSTD.txt

EXAMS environment file: ir298.exv

Chemical Name: Chlorpyrifos

Description Variable Name Value Units Comments

Molecular weightmwt 350.6 g/mol

Henry's Law Const. henry 6.2e-6 atm-m^3/mol

Vapor Pressure vapr 1.87e-5 torr

Solubility sol 1.4 mg/L

Kd Kd mg/L

Koc Koc 6040 mg/L

Photolysis half-life kdp 29.6 days Half-life

Aerobic Aquatic Metabolism kbacw 91.5 days Halfife

Anaerobic Aquatic Metabolism kbacs 63 days Halfife

Aerobic Soil Metabolism asm 109 days Halfife

Hydrolysis: pH 7 81 days Half-life

Method: CAM 2 integer See PRZM manual
117

Incorporation Depth: DEPI 0 cm

Application Rate:TAPP 2.2 kg/ha

Application Efficiency: APPEFF0.95 fraction

Spray Drift DRFT 0.039 fraction of application rate applied to pond

Application Date Date 29-01 dd/mm or dd/mmm or dd-mm or dd-mmm

Interval 1 interval 10 days Set to 0 or delete line for single app.

app. rate 1 apprate 1.1 kg/ha

Interval 2 interval 10 days Set to 0 or delete line for single app.

app. rate 2 apprate 1.1 kg/ha

Record 17: FILTRA

IPSCND1

UPTKF

Record 18: PLVKRT

PLDKRT

FEXTRC 0.5

Flag for Index Res. Run IR Reservoir

Flag for runoff calc. RUNOFF total none, monthly or total(average of entire run)

MN Sugarbeets

stored as MNSugarbeets.out

Chemical: Chlorpyrifos

PRZM environment: MNsugarbeetSTD.txt modified Tueday, 29 May 2007 at 13:57:22

EXAMS environment: ir298.exv modified Thuday, 29 August 2002 at 16:34:12

Metfile: w14914.dvf modified Wedday, 3 July 2002 at 10:05:52

Water segment concentrations (ppb)

Year Peak 96 hr 21 Day 60 Day 90 Day Yearly

1961 1.635 1.501 1.021 0.6292 0.5395 0.247

1962 4.436 3.928 2.812 1.948 1.733 0.7606

1963 3.733 3.231 1.997 1.102 0.8626 0.5191

1964 10.86 9.384 5.736 3.085 2.606 1.031

1965 1.669 1.484 1.117 0.8728 0.8369 0.6246

1966 2.178 1.909 1.491 1.065 0.86 0.4879

1967 0.9462 0.8364 0.7006 0.4827 0.4335 0.2586

1968 0.9537 0.8333 0.6658 0.495 0.398 0.2101

1969 5.972 5.204 4.154 2.353 1.854 0.7659

1970 3.974 3.441 2.13 1.231 1.023 0.693

1971 2.48 2.157 1.437 1.209 1.123 0.6494

1972 1.206 1.07 0.7858 0.6034 0.6004 0.4603

1973 2.73 2.388 1.58 1.22 1.012 0.4791

1974 7.636 6.633 4.177 3.183 2.526 1.129

1975 12.77 11.55 8.136 4.954 3.901 1.672

1976 1.025 1.017 0.9872 0.9313 0.9024 0.4794

1977 7.733 6.66 4.05 2.259 1.897 0.9291

1978 6.034 5.424 3.472 2.2 2.06 1.019

1979 3.095 2.722 1.841 1.499 1.254 0.775

1980 3.116 2.707 1.903 1.515 1.234 0.6298

1981 1.829 1.612 1.078 0.836 0.769 0.4546

1982 5.063 4.366 2.648 1.559 1.271 0.5194

1983 3.069 2.668 2.053 1.403 1.2 0.6845

1984 11.17 9.692 6.305 3.527 2.72 1.247

1985 2.813 2.496 1.897 1.538 1.427 0.8456

1986 5.884 5.099 3.235 2.158 1.839 0.8638

1987 2.24 1.947 1.228 0.8124 0.7209 0.4689

1988 1.74 1.588 1.013 0.6866 0.5831 0.3359

1989 3.791 3.377 2.383 1.415 1.159 0.568
118

1990 5.441 4.737 3.035 2.002 1.591 0.7471

Sorted results

Prob. Peak 96 hr 21 Day 60 Day 90 Day Yearly

0.032258064516129 12.77 11.55 8.136 4.954 3.901 1.672

0.0645161290322581 11.17 9.692 6.305 3.527 2.72 1.247

0.0967741935483871 10.86 9.384 5.736 3.183 2.606 1.129

0.129032258064516 7.733 6.66 4.177 3.085 2.526 1.031

0.161290322580645 7.636 6.633 4.154 2.353 2.06 1.019

0.193548387096774 6.034 5.424 4.05 2.259 1.897 0.9291

0.225806451612903 5.972 5.204 3.472 2.2 1.854 0.8638

0.258064516129032 5.884 5.099 3.235 2.158 1.839 0.8456

0.290322580645161 5.441 4.737 3.035 2.002 1.733 0.775

0.32258064516129 5.063 4.366 2.812 1.948 1.591 0.7659

0.354838709677419 4.436 3.928 2.648 1.559 1.427 0.7606

0.387096774193548 3.974 3.441 2.383 1.538 1.271 0.7471

0.419354838709677 3.791 3.377 2.13 1.515 1.254 0.693

0.451612903225806 3.733 3.231 2.053 1.499 1.234 0.6845

0.483870967741936 3.116 2.722 1.997 1.415 1.2 0.6494

0.516129032258065 3.095 2.707 1.903 1.403 1.159 0.6298

0.548387096774194 3.069 2.668 1.897 1.231 1.123 0.6246

0.580645161290323 2.813 2.496 1.841 1.22 1.023 0.568

0.612903225806452 2.73 2.388 1.58 1.209 1.012 0.5194

0.645161290322581 2.48 2.157 1.491 1.102 0.9024 0.5191

0.67741935483871 2.24 1.947 1.437 1.065 0.8626 0.4879

0.709677419354839 2.178 1.909 1.228 0.9313 0.86 0.4794

0.741935483870968 1.829 1.612 1.117 0.8728 0.8369 0.4791

0.774193548387097 1.74 1.588 1.078 0.836 0.769 0.4689

0.806451612903226 1.669 1.501 1.021 0.8124 0.7209 0.4603

0.838709677419355 1.635 1.484 1.013 0.6866 0.6004 0.4546

0.870967741935484 1.206 1.07 0.9872 0.6292 0.5831 0.3359

0.903225806451613 1.025 1.017 0.7858 0.6034 0.5395 0.2586

0.935483870967742 0.9537 0.8364 0.7006 0.495 0.4335 0.247

0.967741935483871 0.9462 0.8333 0.6658 0.4827 0.398 0.2101

0.1 10.5473 9.1116 5.5801 3.1732 2.598 1.1192

Average of yearly averages: 0.685156666666667

Inputs generated by pe5.pl - Novemeber 2006

Data used for this run:

Output File: MNSugarbeets

Metfile: w14914.dvf

PRZM scenario: MNsugarbeetSTD.txt

EXAMS environment file: ir298.exv

Chemical Name: Chlorpyrifos

Description Variable Name Value Units Comments

Molecular weightmwt 350.6 g/mol

Henry's Law Const. henry 6.2e-6 atm-m^3/mol

Vapor Pressure vapr 1.87e-5 torr

Solubility sol 1.4 mg/L

Kd Kd mg/L

Koc Koc 6040 mg/L

Photolysis half-life kdp 29.6 days Half-life

Aerobic Aquatic Metabolism kbacw 91.5 days Halfife

Anaerobic Aquatic Metabolism kbacs 63 days Halfife
119

Aerobic Soil Metabolism asm 109 days Halfife

Hydrolysis: pH 7 81 days Half-life

Method: CAM 2 integer See PRZM manual

Incorporation Depth: DEPI 0 cm

Application Rate:TAPP 1.1 kg/ha

Application Efficiency: APPEFF0.99 fraction

Spray Drift DRFT 0.01 fraction of application rate applied to pond

Application Date Date 28-05 dd/mm or dd/mmm or dd-mm or dd-mmm

Interval 1 interval 10 days Set to 0 or delete line for single app.

app. rate 1 apprate 1.1 kg/ha

Interval 2 interval 10 days Set to 0 or delete line for single app.

app. rate 2 apprate 1.1 kg/ha

Record 17: FILTRA

IPSCND1

UPTKF

Record 18: PLVKRT

PLDKRT

FEXTRC 0.5

Flag for Index Res. Run IR Reservoir

Flag for runoff calc. RUNOFF total none, monthly or total(average of entire run)

Sugarbeet Average Typical Rate

 Beets 1.68 and 0.56 

 WATER COLUMN DISSOLVED CONCENTRATION (PPB)

 YEAR PEAK 96 HOUR 21 DAY 60 DAY 90 DAY YEARLY

 ---- ---- ------- ------ ------ ------ ------

 1961 11.790 10.200 6.508 3.720 3.025 1.180

 1962 17.360 15.260 10.140 7.056 5.877 2.336

 1963 5.842 5.103 3.664 2.151 2.058 1.156

 1964 13.450 11.590 7.062 3.813 3.228 1.301

 1965 1.901 1.695 1.294 1.043 1.081 .769

 1966 2.499 2.180 1.687 1.194 .963 .519

 1967 1.095 .972 .664 .496 .453 .275

 1968 .933 .828 .576 .461 .417 .226

 1969 6.967 6.075 4.887 2.801 2.261 .956

 1970 4.459 3.869 2.426 1.761 1.399 .935

 1971 6.937 6.122 4.058 2.489 1.978 1.184

 1972 6.092 5.285 3.409 1.944 1.659 .899

 1973 2.999 2.617 1.724 1.347 1.115 .543

 1974 8.403 7.303 4.644 3.591 2.867 1.418

 1975 15.180 13.700 9.584 5.829 4.590 1.924

 1976 1.170 1.161 1.124 1.054 1.016 .477

 1977 9.209 7.965 4.953 3.439 2.852 1.267

 1978 10.850 9.376 5.785 3.490 3.091 1.410

 1979 3.559 3.121 2.097 1.644 1.358 .882

 1980 3.684 3.187 2.210 1.745 1.418 .671

 1981 14.550 12.800 8.455 5.030 4.065 1.560

 1982 5.695 4.904 2.975 1.770 1.451 .783

 1983 3.452 2.993 2.309 1.582 1.346 .769

 1984 21.820 18.870 11.900 6.601 5.090 2.033
120

 1985 10.310 9.072 6.339 4.798 4.173 1.941

 1986 6.908 5.996 3.845 2.605 2.227 1.178

 1987 4.828 4.239 3.523 2.086 1.909 .913

 1988 1.926 1.757 1.113 .766 .648 .396

 1989 4.413 3.947 2.779 1.674 1.376 .707

 1990 8.049 6.958 4.903 3.566 2.807 1.182

 SORTED FOR PLOTTING 

 ------ --- --------

 PROB PEAK 96 HOUR 21 DAY 60 DAY 90 DAY YEARLY

 ---- ---- ------- ------ ------ ------ ------

 .031 21.820 18.870 11.900 7.056 5.877 2.336

 .063 17.360 15.260 10.140 6.601 5.090 2.033

 .094 15.180 13.700 9.584 5.829 4.590 1.941

 .125 14.550 12.800 8.455 5.030 4.173 1.924

 .156 13.450 11.590 7.062 4.798 4.065 1.560

 .188 11.790 10.200 6.508 3.813 3.228 1.418

 .219 10.850 9.376 6.339 3.720 3.091 1.410

 .250 10.310 9.072 5.785 3.591 3.025 1.301

 .281 9.209 7.965 4.953 3.566 2.867 1.267

 .313 8.403 7.303 4.903 3.490 2.852 1.184

 .344 8.049 6.958 4.887 3.439 2.807 1.182

 .375 6.967 6.122 4.644 2.801 2.261 1.180

 .406 6.937 6.075 4.058 2.605 2.227 1.178

 .438 6.908 5.996 3.845 2.489 2.058 1.156

 .469 6.092 5.285 3.664 2.151 1.978 .956

 .500 5.842 5.103 3.523 2.086 1.909 .935

 .531 5.695 4.904 3.409 1.944 1.659 .913

 .563 4.828 4.239 2.975 1.770 1.451 .899

 .594 4.459 3.947 2.779 1.761 1.418 .882

 .625 4.413 3.869 2.426 1.745 1.399 .783

 .656 3.684 3.187 2.309 1.674 1.376 .769

 .688 3.559 3.121 2.210 1.644 1.358 .769

 .719 3.452 2.993 2.097 1.582 1.346 .707

 .750 2.999 2.617 1.724 1.347 1.115 .671

 .781 2.499 2.180 1.687 1.194 1.081 .543

 .813 1.926 1.757 1.294 1.054 1.016 .519

 .844 1.901 1.695 1.124 1.043 .963 .477

 .875 1.170 1.161 1.113 .766 .648 .396

 .906 1.095 .972 .664 .496 .453 .275

 .938 .933 .828 .576 .461 .417 .226

 .969 .000 .000 .000 .000 .000 .000

 1/10 15.054 13.520 9.358 5.669 4.507 1.938

 MEAN OF ANNUAL VALUES = 1.060

 STANDARD DEVIATION OF ANNUAL VALUES = .527

 UPPER 90% CONFIDENCE LIMIT ON MEAN = 1.200

MN Sugarbeets; 8/15/2001 

"Polk County, MN; MLRA: 56; Metfile: W14914.dvf (old: Met56.met), 
121

*** Record 3:

 0.75 0.36 0 12.5 1 1

*** Record 6 -- ERFLAG

 4

*** Record 7:

 0.28 0.25 0.6 172.8 3 1.5 600

*** Record 8

 1

*** Record 9

 1 0.2 100 100 3 91 85 91 0 76

*** Record 9a-e

 1 28

1605 0106 1606 2506 0107 1607 0108 1608 0109 1609 0110 1610 2010 0111 1611 0112

.609 .436 .252 .162 .128 .119 .123 .125 .126 .127 .173 .195 .017 .048 .058 .066 

.014 .014 .014 .014 .014 .014 .014 .014 .014 .014 .014 .014 .014 .014 .014 .014 

 85 85 85 85 85 85 85 85 85 85 85 91 91 91 91 91 

1612 0101 1601 0102 1602 0103 1603 0104 1504 1604 2504 0105 

.072 .278 .285 .292 .301 .316 .345 .382 .538 .555 .618 .638 

.014 .014 .014 .014 .014 .014 .014 .014 .014 .014 .014 .014

 91 91 91 91 91 91 91 91 91 91 91 91

*** Record 10 -- NCPDS, the number of cropping periods

 30

*** Record 11

 160561 011061 151061 1

 160562 011062 151062 1

 160563 011063 151063 1

 160564 011064 151064 1

 160565 011065 151065 1

 160566 011066 151066 1

 160567 011067 151067 1

 160568 011068 151068 1

 160569 011069 151069 1

 160570 011070 151070 1

 160571 011071 151071 1

 160572 011072 151072 1

 160573 011073 151073 1

 160574 011074 151074 1

 160575 011075 151075 1

 160576 011076 151076 1

 160577 011077 151077 1

 160578 011078 151078 1

 160579 011079 151079 1

 160580 011080 151080 1

 160581 011081 151081 1

 160582 011082 151082 1

 160583 011083 151083 1

 160584 011084 151084 1

 160585 011085 151085 1

 160586 011086 151086 1

 160587 011087 151087 1

 160588 011088 151088 1

 160589 011089 151089 1

 160590 011090 151090 1

*** Record 12 -- PTITLE

Chlorpyrifos - 2 applications @ 0.89 0.89 kg/ha 

*** Record 13
122

 60 1 0 0

*** Record 15 -- PSTNAM

Chlorpyrifos

*** Record 16

 050561 0 4 0.6 1.68 1.00 .0

 250561 0 2 4.0 0.56 .99 .01

 050562 0 4 0.6 1.68 1.00 .0

 250562 0 2 4.0 0.56 .99 .01

 050563 0 4 0.6 1.68 1.00 .0

 250563 0 2 4.0 0.56 .99 .01

 050564 0 4 0.6 1.68 1.00 .0

 250564 0 2 4.0 0.56 .99 .01

 050565 0 4 0.6 1.68 1.00 .0

 250565 0 2 4.0 0.56 .99 .01

 050566 0 4 0.6 1.68 1.00 .0

 250566 0 2 4.0 0.56 .99 .01

 050567 0 4 0.6 1.68 1.00 .0

 250567 0 2 4.0 0.56 .99 .01

 050568 0 4 0.6 1.68 1.00 .0

 250568 0 2 4.0 0.56 .99 .01

 050569 0 4 0.6 1.68 1.00 .0

 250569 0 2 4.0 0.56 .99 .01

 050570 0 4 0.6 1.68 1.00 .0

 250570 0 2 4.0 0.56 .99 .01

 050571 0 4 0.6 1.68 1.00 .0

 250571 0 2 4.0 0.56 .99 .01

 050572 0 4 0.6 1.68 1.00 .0

 250572 0 2 4.0 0.56 .99 .01

 050573 0 4 0.6 1.68 1.00 .0

 250573 0 2 4.0 0.56 .99 .01

 050574 0 4 0.6 1.68 1.00 .0

 250574 0 2 4.0 0.56 .99 .01

 050575 0 4 0.6 1.68 1.00 .0

 250575 0 2 4.0 0.56 .99 .01

 050576 0 4 0.6 1.68 1.0 .0

 250576 0 2 4.0 0.56 .99 .01

 050577 0 4 0.6 1.68 1.00 .0

 250577 0 2 4.0 0.56 .99 .01

 050578 0 4 0.6 1.68 1.00 .0

 250578 0 2 4.0 0.56 .99 .01

 050579 0 4 0.6 1.68 1.00 .0

 250579 0 2 4.0 0.56 .99 .01

 050580 0 4 0.6 1.68 1.00 .0

 250580 0 2 4.0 0.56 .99 .01

 050581 0 4 0.6 1.68 1.00 .0

 250581 0 2 4.0 0.56 .99 .01

 050582 0 4 0.6 1.68 1.00 .0

 250582 0 2 4.0 0.56 .99 .01

 050583 0 4 0.6 1.68 1.00 .0

 250583 0 2 4.0 0.56 .99 .01

 050584 0 4 0.6 1.68 1.00 .0

 250584 0 2 4.0 0.56 .99 .01

 050585 0 4 0.6 1.68 1.00 .0

 250585 0 2 4.0 0.56 .99 .01

 050586 0 4 0.6 1.68 1.00 .0

 250586 0 2 4.0 0.56 .99 .01
123

 050587 0 4 0.6 1.68 1.00 .0

 250587 0 2 4.0 0.56 .99 .01

 050588 0 4 0.6 1.68 1.00 .0

 250588 0 2 4.0 0.56 .99 .01

 050589 0 4 0.6 1.68 1.00 .0

 250589 0 2 4.0 0.56 .99 .01

 050590 0 4 0.6 1.68 1.00 .0

 250590 0 2 4.0 0.56 .99 .01

*** Record 17

 0 1 0

*** Record 18

 0 0 0.5

*** Record 19 -- STITLE

Bearden silty clay loam - Hydg. C 

*** Record 20

 100 0 0 1 0 0 0 0 0 0

*** Record 26

 0 0 0

*** Record 30

 4 6040

*** Record 33

 4

 1 10 1.4 0.377 0 0 0

 0.0063590.006359 0

 0.1 0.377 0.207 4.06 0

 2 8 1.4 0.377 0 0 0

 0.0063590.006359 0

 4 0.377 0.207 4.06 0

 3 54 1.5 0.292 0 0 0

 0.0063590.006359 0

 3 0.292 0.132 0.174 0

 4 28 1.8 0.285 0 0 0

 0.0063590.006359 0

 4 0.285 0.125 0.116 0

***Record 40

 0

 YEAR 10 YEAR 10 YEAR 10 1

 1

 1 -----

 7 YEAR

 PRCP TCUM 0 0

 RUNF TCUM 0 0

 INFL TCUM 1 1

 ESLS TCUM 0 0 1.0E3

 RFLX TCUM 0 0 1.0E5

 EFLX TCUM 0 0 1.0E5

 RZFX TCUM 0 0 1.0E5

Sunflower, Wheat

stored as TX wheat_sunflower.out

Chemical: Chlorpyrifos

PRZM environment: TXwheatOP.txt modified Thuday, 14 June 2007 at 11:24:44

EXAMS environment: ir298.exv modified Thuday, 29 August 2002 at 16:34:12

Metfile: w13958.dvf modified Wedday, 3 July 2002 at 10:06:24

Water segment concentrations (ppb)
124

Year Peak 96 hr 21 Day 60 Day 90 Day Yearly

1961 78.08 67.16 41.94 29.08 21.9 6.899

1962 36.31 30.94 20.38 13.63 10.55 5.648

1963 7.149 6.394 4.483 3.575 3.221 1.881

1964 90.46 76.79 44.53 21.85 16.38 6.804

1965 30.36 26.06 17.14 10.18 9.419 5.086

1966 32.57 29.53 19.64 12.24 9.312 4.056

1967 17.15 14.99 10.9 9.662 9.102 3.95

1968 28.13 24.29 14.47 8.196 7.142 4.645

1969 24.15 21.68 17 10.16 8.237 4.313

1970 9.4 8.175 5.491 4.364 3.702 2.736

1971 32.1 29.6 18.7 10.19 8.401 3.606

1972 15.29 13.14 8.131 6.037 5.165 2.865

1973 41.14 37.57 30.42 19.82 15.07 6.301

1974 38.27 32.72 19.57 13.31 10.2 5.622

1975 38.3 33.65 24.8 16.07 12.92 6.287

1976 29.68 25.59 21.35 13 10.75 5.047

1977 13.11 11.23 7.927 4.361 3.391 2.149

1978 17.06 14.62 8.646 6.386 5.268 3.197

1979 63.61 54.65 41.54 22.73 17.44 6.646

1980 13.23 12.07 7.587 5.376 4.994 2.791

1981 126 113 74.9 40.95 30.43 10.61

1982 10.26 8.881 5.51 4.231 3.802 2.409

1983 17.58 15.11 9.399 6.482 6.067 3.24

1984 22.13 19.9 15.17 9.105 7.37 2.597

1985 35.75 30.7 20.06 12.38 9.27 5.282

1986 24.74 21.44 14.19 9.893 8.246 3.913

1987 42.98 37.19 28.16 20.79 16.21 6.705

1988 6.984 6.133 4.301 3.952 3.746 2.033

1989 12.11 10.72 6.569 3.862 3.773 2.063

1990 15.63 13.4 8.776 5.092 4.107 2.716

Sorted results

Prob. Peak 96 hr 21 Day 60 Day 90 Day Yearly

0.032258064516129 126 113 74.9 40.95 30.43 10.61

0.0645161290322581 90.46 76.79 44.53 29.08 21.9 6.899

0.0967741935483871 78.08 67.16 41.94 22.73 17.44 6.804

0.129032258064516 63.61 54.65 41.54 21.85 16.38 6.705

0.161290322580645 42.98 37.57 30.42 20.79 16.21 6.646

0.193548387096774 41.14 37.19 28.16 19.82 15.07 6.301

0.225806451612903 38.3 33.65 24.8 16.07 12.92 6.287

0.258064516129032 38.27 32.72 21.35 13.63 10.75 5.648

0.290322580645161 36.31 30.94 20.38 13.31 10.55 5.622

0.32258064516129 35.75 30.7 20.06 13 10.2 5.282

0.354838709677419 32.57 29.6 19.64 12.38 9.419 5.086

0.387096774193548 32.1 29.53 19.57 12.24 9.312 5.047

0.419354838709677 30.36 26.06 18.7 10.19 9.27 4.645

0.451612903225806 29.68 25.59 17.14 10.18 9.102 4.313

0.483870967741936 28.13 24.29 17 10.16 8.401 4.056

0.516129032258065 24.74 21.68 15.17 9.893 8.246 3.95

0.548387096774194 24.15 21.44 14.47 9.662 8.237 3.913

0.580645161290323 22.13 19.9 14.19 9.105 7.37 3.606

0.612903225806452 17.58 15.11 10.9 8.196 7.142 3.24

0.645161290322581 17.15 14.99 9.399 6.482 6.067 3.197

0.67741935483871 17.06 14.62 8.776 6.386 5.268 2.865

0.709677419354839 15.63 13.4 8.646 6.037 5.165 2.791
125

0.741935483870968 15.29 13.14 8.131 5.376 4.994 2.736

0.774193548387097 13.23 12.07 7.927 5.092 4.107 2.716

0.806451612903226 13.11 11.23 7.587 4.364 3.802 2.597

0.838709677419355 12.11 10.72 6.569 4.361 3.773 2.409

0.870967741935484 10.26 8.881 5.51 4.231 3.746 2.149

0.903225806451613 9.4 8.175 5.491 3.952 3.702 2.063

0.935483870967742 7.149 6.394 4.483 3.862 3.391 2.033

0.967741935483871 6.984 6.133 4.301 3.575 3.221 1.881

0.1 76.633 65.909 41.9 22.642 17.334 6.7941

Average of yearly averages: 4.40323333333333

Inputs generated by pe5.pl - Novemeber 2006

Data used for this run:

Output File: TX wheat_sunflower

Metfile: w13958.dvf

PRZM scenario: TXwheatOP.txt

EXAMS environment file: ir298.exv

Chemical Name: Chlorpyrifos

Description Variable Name Value Units Comments

Molecular weightmwt 350.6 g/mol

Henry's Law Const. henry 6.2e-6 atm-m^3/mol

Vapor Pressure vapr 1.87e-5 torr

Solubility sol 1.4 mg/L

Kd Kd mg/L

Koc Koc 6040 mg/L

Photolysis half-life kdp 29.6 days Half-life

Aerobic Aquatic Metabolism kbacw 91.5 days Halfife

Anaerobic Aquatic Metabolism kbacs 63 days Halfife

Aerobic Soil Metabolism asm 109 days Halfife

Hydrolysis: pH 7 81 days Half-life

Method: CAM 2 integer See PRZM manual

Incorporation Depth: DEPI 0 cm

Application Rate:TAPP 1.7 kg/ha

Application Efficiency: APPEFF0.99 fraction

Spray Drift DRFT 0.01 fraction of application rate applied to pond

Application Date Date 27-05 dd/mm or dd/mmm or dd-mm or dd-mmm

Interval 1 interval 10 days Set to 0 or delete line for single app.

app. rate 1 apprate 1.7 kg/ha

Interval 2 interval 158 days Set to 0 or delete line for single app.

app. rate 2 apprate 0.56 kg/ha

Interval 3 interval 10 days Set to 0 or delete line for single app.

app. rate 3 apprate 0.56 kg/ha

Record 17: FILTRA

IPSCND1

UPTKF

Record 18: PLVKRT

PLDKRT

FEXTRC 0.5

Flag for Index Res. Run IR Reservoir

Flag for runoff calc. RUNOFF total none, monthly or total(average of entire run)

MS Soybean (surrogate for soybean)

stored as MSsoybean_aerial.out

Chemical: Chlorpyrifos
126

PRZM environment: MSsoybeanSTD.txt modified Tueday, 29 May 2007 at 13:58:06

EXAMS environment: ir298.exv modified Thuday, 29 August 2002 at 16:34:12

Metfile: w03940.dvf modified Wedday, 3 July 2002 at 10:05:46

Water segment concentrations (ppb)

Year Peak 96 hr 21 Day 60 Day 90 Day Yearly

1961 19.49 16.95 10.59 7.764 6.108 2.454

1962 3.911 3.47 2.871 2.403 2.097 1.408

1963 22.41 19.37 11.83 7.027 5.407 2.242

1964 15.82 13.67 8.315 4.849 4.39 2.767

1965 18.25 15.6 9.37 4.891 3.715 2.165

1966 15.73 14.63 10.99 6.265 5.562 2.804

1967 12.57 11.39 9.16 7.008 5.742 2.607

1968 12.28 10.7 7.329 4.374 3.432 1.809

1969 6.549 5.661 3.465 2.084 1.837 1.27

1970 8.799 7.702 6.011 4.285 3.687 1.94

1971 9.528 8.267 5.121 3.26 3.109 2.248

1972 3.653 3.225 2.431 1.865 1.702 1.377

1973 4.429 3.971 3.184 2.065 1.79 1.356

1974 21.48 18.62 11.5 6.242 5.065 2.795

1975 19.3 16.81 13.4 9.1 8.009 4.017

1976 16.65 14.56 10.79 7.896 6.504 3.219

1977 8.815 7.663 4.814 4.102 3.595 2.332

1978 8.644 7.582 6.252 4.032 3.513 2.072

1979 33.46 29.7 20.97 16.67 14.26 6.639

1980 13.15 11.67 9.108 6.18 5.07 2.948

1981 28.1 24.93 15.55 10.3 8.87 3.478

1982 29.43 25.48 15.79 12.71 10.24 4.692

1983 20.33 18.58 13.58 8.314 6.646 3.787

1984 9.292 8.34 5.25 3.823 3.407 2.448

1985 15.56 13.43 8.166 4.45 3.906 2.208

1986 32.24 28.04 21.05 12.63 10.07 3.889

1987 23.91 21.41 14.35 7.943 6.175 2.786

1988 5.35 4.685 3.125 2.741 2.461 1.618

1989 29.69 25.85 17.9 11.87 9.615 3.977

1990 6.934 6.106 4.957 3.294 2.665 1.951

Sorted results

Prob. Peak 96 hr 21 Day 60 Day 90 Day Yearly

0.032258064516129 33.46 29.7 21.05 16.67 14.26 6.639

0.0645161290322581 32.24 28.04 20.97 12.71 10.24 4.692

0.0967741935483871 29.69 25.85 17.9 12.63 10.07 4.017

0.129032258064516 29.43 25.48 15.79 11.87 9.615 3.977

0.161290322580645 28.1 24.93 15.55 10.3 8.87 3.889

0.193548387096774 23.91 21.41 14.35 9.1 8.009 3.787

0.225806451612903 22.41 19.37 13.58 8.314 6.646 3.478

0.258064516129032 21.48 18.62 13.4 7.943 6.504 3.219

0.290322580645161 20.33 18.58 11.83 7.896 6.175 2.948

0.32258064516129 19.49 16.95 11.5 7.764 6.108 2.804

0.354838709677419 19.3 16.81 10.99 7.027 5.742 2.795

0.387096774193548 18.25 15.6 10.79 7.008 5.562 2.786

0.419354838709677 16.65 14.63 10.59 6.265 5.407 2.767

0.451612903225806 15.82 14.56 9.37 6.242 5.07 2.607

0.483870967741936 15.73 13.67 9.16 6.18 5.065 2.454

0.516129032258065 15.56 13.43 9.108 4.891 4.39 2.448

0.548387096774194 13.15 11.67 8.315 4.849 3.906 2.332
127

0.580645161290323 12.57 11.39 8.166 4.45 3.715 2.248

0.612903225806452 12.28 10.7 7.329 4.374 3.687 2.242

0.645161290322581 9.528 8.34 6.252 4.285 3.595 2.208

0.67741935483871 9.292 8.267 6.011 4.102 3.513 2.165

0.709677419354839 8.815 7.702 5.25 4.032 3.432 2.072

0.741935483870968 8.799 7.663 5.121 3.823 3.407 1.951

0.774193548387097 8.644 7.582 4.957 3.294 3.109 1.94

0.806451612903226 6.934 6.106 4.814 3.26 2.665 1.809

0.838709677419355 6.549 5.661 3.465 2.741 2.461 1.618

0.870967741935484 5.35 4.685 3.184 2.403 2.097 1.408

0.903225806451613 4.429 3.971 3.125 2.084 1.837 1.377

0.935483870967742 3.911 3.47 2.871 2.065 1.79 1.356

0.967741935483871 3.653 3.225 2.431 1.865 1.702 1.27

0.1 29.664 25.813 17.689 12.554 10.0245 4.013

Average of yearly averages: 2.7101

Inputs generated by pe5.pl - Novemeber 2006

Data used for this run:

Output File: MSsoybean_aerial

Metfile: w03940.dvf

PRZM scenario: MSsoybeanSTD.txt

EXAMS environment file: ir298.exv

Chemical Name: Chlorpyrifos

Description Variable Name Value Units Comments

Molecular weightmwt 350.6 g/mol

Henry's Law Const. henry 6.2e-6 atm-m^3/mol

Vapor Pressure vapr 1.87e-5 torr

Solubility sol 1.4 mg/L

Kd Kd mg/L

Koc Koc 6040 mg/L

Photolysis half-life kdp 29.6 days Half-life

Aerobic Aquatic Metabolism kbacw 91.5 days Halfife

Anaerobic Aquatic Metabolism kbacs 63 days Halfife

Aerobic Soil Metabolism asm 109 days Halfife

Hydrolysis: pH 7 81 days Half-life

Method: CAM 2 integer See PRZM manual

Incorporation Depth: DEPI 0 cm

Application Rate:TAPP 1.1 kg/ha

Application Efficiency: APPEFF0.95 fraction

Spray Drift DRFT 0.039 fraction of application rate applied to pond

Application Date Date 15-5 dd/mm or dd/mmm or dd-mm or dd-mmm

Interval 1 interval 10 days Set to 0 or delete line for single app.

app. rate 1 apprate 1.1 kg/ha

Interval 2 interval 10 days Set to 0 or delete line for single app.

app. rate 2 apprate 1.1 kg/ha

Record 17: FILTRA

IPSCND1

UPTKF

Record 18: PLVKRT

PLDKRT

FEXTRC 0.5

Flag for Index Res. Run IR Reservoir

Flag for runoff calc. RUNOFF total none, monthly or total(average of entire run)
128

MS Bean

stored as MsBeans.out

Chemical: Chlorpyrifos

PRZM environment: MSsoybeanSTD.txt modified Tueday, 29 May 2007 at 13:58:06

EXAMS environment: ir298.exv modified Thuday, 29 August 2002 at 16:34:12

Metfile: w03940.dvf modified Wedday, 3 July 2002 at 10:05:46

Water segment concentrations (ppb)

Year Peak 96 hr 21 Day 60 Day 90 Day Yearly

1961 5.473 4.749 2.946 2.184 1.714 0.6704

1962 0.9707 0.9012 0.8225 0.7112 0.6196 0.3743

1963 6.872 5.935 3.609 2.117 1.626 0.6414

1964 4.729 4.084 2.478 1.441 1.303 0.8026

1965 5.527 4.721 2.825 1.465 1.109 0.6013

1966 3.26 2.863 1.753 1.01 0.8172 0.4982

1967 4.035 3.5 2.168 1.682 1.376 0.6362

1968 4.772 4.146 2.587 1.42 1.117 0.552

1969 1.875 1.617 0.9805 0.5739 0.4799 0.3317

1970 2.63 2.3 1.793 1.271 1.093 0.5391

1971 2.881 2.496 1.537 0.9483 0.9086 0.6258

1972 1.142 1.007 0.7555 0.5577 0.5087 0.3713

1973 1.303 1.169 0.6547 0.5354 0.4465 0.3355

1974 5.728 4.965 3.066 1.658 1.361 0.7717

1975 5.96 5.175 4.112 2.669 2.319 1.138

1976 6.888 6.008 4.211 2.805 2.257 1.042

1977 2.169 1.911 1.298 1.057 0.9256 0.6472

1978 1.849 1.622 1.073 0.6541 0.5769 0.4813

1979 10.03 8.886 6.224 4.789 4.122 1.932

1980 1.485 1.395 1.269 1.088 1.016 0.6324

1981 8.012 7.092 4.37 2.772 2.251 0.8916

1982 8.07 6.977 4.302 3.545 2.863 1.309

1983 2.352 2.044 1.489 1.132 1.016 0.7

1984 2.867 2.571 1.609 1.168 0.918 0.6719

1985 4.584 3.951 2.388 1.291 1.134 0.6088

1986 14.72 12.77 8.85 5.088 3.942 1.406

1987 7.36 6.57 4.405 2.43 1.878 0.8327

1988 1.515 1.324 0.8777 0.7687 0.6897 0.4275

1989 7.89 6.835 4.671 2.865 2.22 0.9642

1990 2.75 2.41 1.648 1.018 0.7955 0.5801

Sorted results

Prob. Peak 96 hr 21 Day 60 Day 90 Day Yearly

0.032258064516129 14.72 12.77 8.85 5.088 4.122 1.932

0.0645161290322581 10.03 8.886 6.224 4.789 3.942 1.406

0.0967741935483871 8.07 7.092 4.671 3.545 2.863 1.309

0.129032258064516 8.012 6.977 4.405 2.865 2.319 1.138

0.161290322580645 7.89 6.835 4.37 2.805 2.257 1.042

0.193548387096774 7.36 6.57 4.302 2.772 2.251 0.9642

0.225806451612903 6.888 6.008 4.211 2.669 2.22 0.8916

0.258064516129032 6.872 5.935 4.112 2.43 1.878 0.8327

0.290322580645161 5.96 5.175 3.609 2.184 1.714 0.8026

0.32258064516129 5.728 4.965 3.066 2.117 1.626 0.7717

0.354838709677419 5.527 4.749 2.946 1.682 1.376 0.7

0.387096774193548 5.473 4.721 2.825 1.658 1.361 0.6719

0.419354838709677 4.772 4.146 2.587 1.465 1.303 0.6704

0.451612903225806 4.729 4.084 2.478 1.441 1.134 0.6472
129

0.483870967741936 4.584 3.951 2.388 1.42 1.117 0.6414

0.516129032258065 4.035 3.5 2.168 1.291 1.109 0.6362

0.548387096774194 3.26 2.863 1.793 1.271 1.093 0.6324

0.580645161290323 2.881 2.571 1.753 1.168 1.016 0.6258

0.612903225806452 2.867 2.496 1.648 1.132 1.016 0.6088

0.645161290322581 2.75 2.41 1.609 1.088 0.9256 0.6013

0.67741935483871 2.63 2.3 1.537 1.057 0.918 0.5801

0.709677419354839 2.352 2.044 1.489 1.018 0.9086 0.552

0.741935483870968 2.169 1.911 1.298 1.01 0.8172 0.5391

0.774193548387097 1.875 1.622 1.269 0.9483 0.7955 0.4982

0.806451612903226 1.849 1.617 1.073 0.7687 0.6897 0.4813

0.838709677419355 1.515 1.395 0.9805 0.7112 0.6196 0.4275

0.870967741935484 1.485 1.324 0.8777 0.6541 0.5769 0.3743

0.903225806451613 1.303 1.169 0.8225 0.5739 0.5087 0.3713

0.935483870967742 1.142 1.007 0.7555 0.5577 0.4799 0.3355

0.967741935483871 0.9707 0.9012 0.6547 0.5354 0.4465 0.3317

0.1 8.0642 7.0805 4.6444 3.477 2.8086 1.2919

Average of yearly averages: 0.733873333333333

Inputs generated by pe5.pl - Novemeber 2006

Data used for this run:

Output File: MsBeans

Metfile: w03940.dvf

PRZM scenario: MSsoybeanSTD.txt

EXAMS environment file: ir298.exv

Chemical Name: Chlorpyrifos

Description Variable Name Value Units Comments

Molecular weightmwt 350.6 g/mol

Henry's Law Const. henry 6.2e-6 atm-m^3/mol

Vapor Pressure vapr 1.87e-5 torr

Solubility sol 1.4 mg/L

Kd Kd mg/L

Koc Koc 6040 mg/L

Photolysis half-life kdp 29.6 days Half-life

Aerobic Aquatic Metabolism kbacw 91.5 days Halfife

Anaerobic Aquatic Metabolism kbacs 63 days Halfife

Aerobic Soil Metabolism asm 109 days Halfife

Hydrolysis: pH 7 81 days Half-life

Method: CAM 4 integer See PRZM manual

Incorporation Depth: DEPI 2.5 cm

Application Rate:TAPP 1.1 kg/ha

Application Efficiency: APPEFF0.99 fraction

Spray Drift DRFT 0.01 fraction of application rate applied to pond

Application Date Date 25-05 dd/mm or dd/mmm or dd-mm or dd-mmm

Record 17: FILTRA

IPSCND1

UPTKF

Record 18: PLVKRT

PLDKRT

FEXTRC 0.5

Flag for Index Res. Run IR Reservoir

Flag for runoff calc. RUNOFF total none, monthly or total(average of entire run)

NC Sweet Potatoes
130

stored as NC sweetpotatos--final.out

Chemical: Chlorpyrifos

PRZM environment: NCSweetPotatoSTD.txt modified Tueday, 29 May 2007 at 13:58:56

EXAMS environment: ir298.exv modified Thuday, 29 August 2002 at 16:34:12

Metfile: w13722.dvf modified Wedday, 3 July 2002 at 10:05:50

Water segment concentrations (ppb)

Year Peak 96 hr 21 Day 60 Day 90 Day Yearly

1961 7.81 6.869 5.157 3.385 3.462 1.414

1962 24.66 21.61 15.54 12.09 9.922 4.171

1963 33 29.18 22.22 13.61 10.73 4.534

1964 11.79 10.37 6.978 5.986 5.219 3.304

1965 48.78 43.13 32.94 21.2 17.15 6.33

1966 24.53 21.41 14.43 12.31 10.5 4.568

1967 41.22 35.88 24.15 14.28 11.66 4.696

1968 27.33 23.85 15.69 10.74 8.817 3.912

1969 21.62 19.13 14.21 10.92 9.586 4.274

1970 14.22 12.39 8.786 6.147 4.911 2.554

1971 29.85 26.14 17.32 13.17 11.06 4.75

1972 29.05 25.64 17.61 13.43 12.42 5.419

1973 34.07 30.33 23.71 15.21 13.03 5.383

1974 18.08 16.45 12.6 7.935 6.987 3.38

1975 23.32 21.29 14.03 10.46 8.93 3.954

1976 21.58 19.83 16.21 10.88 8.499 3.969

1977 29.28 25.75 16.53 9.447 7.723 4.029

1978 21.42 18.77 13.14 10.25 8.272 3.77

1979 18.41 16.42 11.92 8.448 7.316 3.771

1980 33.58 29.36 18.86 12.46 10.6 4.433

1981 18.78 16.48 12.09 9.359 8.251 3.886

1982 35.14 30.94 23.18 15.3 12.06 4.723

1983 20.83 19 15.26 9.995 7.868 3.448

1984 57.22 49.86 31.13 19.28 15.61 5.8

1985 10.99 9.846 8.038 6.605 6.312 3.324

1986 22.18 19.38 13.43 8.154 7.178 3.855

1987 12.07 10.54 8.784 5.394 4.579 2.853

1988 14.32 12.52 8.619 5.735 4.684 2.755

1989 33.91 29.92 19.84 12.11 10.08 4.158

1990 38.34 33.36 21.02 11.87 9.236 3.802

Sorted results

Prob. Peak 96 hr 21 Day 60 Day 90 Day Yearly

0.032258064516129 57.22 49.86 32.94 21.2 17.15 6.33

0.0645161290322581 48.78 43.13 31.13 19.28 15.61 5.8

0.0967741935483871 41.22 35.88 24.15 15.3 13.03 5.419

0.129032258064516 38.34 33.36 23.71 15.21 12.42 5.383

0.161290322580645 35.14 30.94 23.18 14.28 12.06 4.75

0.193548387096774 34.07 30.33 22.22 13.61 11.66 4.723

0.225806451612903 33.91 29.92 21.02 13.43 11.06 4.696

0.258064516129032 33.58 29.36 19.84 13.17 10.73 4.568

0.290322580645161 33 29.18 18.86 12.46 10.6 4.534

0.32258064516129 29.85 26.14 17.61 12.31 10.5 4.433

0.354838709677419 29.28 25.75 17.32 12.11 10.08 4.274

0.387096774193548 29.05 25.64 16.53 12.09 9.922 4.171

0.419354838709677 27.33 23.85 16.21 11.87 9.586 4.158

0.451612903225806 24.66 21.61 15.69 10.92 9.236 4.029

0.483870967741936 24.53 21.41 15.54 10.88 8.93 3.969
131

0.516129032258065 23.32 21.29 15.26 10.74 8.817 3.954

0.548387096774194 22.18 19.83 14.43 10.46 8.499 3.912

0.580645161290323 21.62 19.38 14.21 10.25 8.272 3.886

0.612903225806452 21.58 19.13 14.03 9.995 8.251 3.855

0.645161290322581 21.42 19 13.43 9.447 7.868 3.802

0.67741935483871 20.83 18.77 13.14 9.359 7.723 3.771

0.709677419354839 18.78 16.48 12.6 8.448 7.316 3.77

0.741935483870968 18.41 16.45 12.09 8.154 7.178 3.448

0.774193548387097 18.08 16.42 11.92 7.935 6.987 3.38

0.806451612903226 14.32 12.52 8.786 6.605 6.312 3.324

0.838709677419355 14.22 12.39 8.784 6.147 5.219 3.304

0.870967741935484 12.07 10.54 8.619 5.986 4.911 2.853

0.903225806451613 11.79 10.37 8.038 5.735 4.684 2.755

0.935483870967742 10.99 9.846 6.978 5.394 4.579 2.554

0.967741935483871 7.81 6.869 5.157 3.385 3.462 1.414

0.1 40.932 35.628 24.106 15.291 12.969 5.4154

Average of yearly averages: 4.04063333333333

Inputs generated by pe5.pl - Novemeber 2006

Data used for this run:

Output File: NC sweetpotatos--final

Metfile: w13722.dvf

PRZM scenario: NCSweetPotatoSTD.txt

EXAMS environment file: ir298.exv

Chemical Name: Chlorpyrifos

Description Variable Name Value Units Comments

Molecular weightmwt 350.6 g/mol

Henry's Law Const. henry 6.2e-6 atm-m^3/mol

Vapor Pressure vapr 1.87e-5 torr

Solubility sol 1.4 mg/L

Kd Kd mg/L

Koc Koc 6040 mg/L

Photolysis half-life kdp 29.6 days Half-life

Aerobic Aquatic Metabolism kbacw 91.5 days Halfife

Anaerobic Aquatic Metabolism kbacs 63 days Halfife

Aerobic Soil Metabolism asm 109 days Halfife

Hydrolysis: pH 7 81 days Half-life

Method: CAM 1 integer See PRZM manual

Incorporation Depth: DEPI 0 cm

Application Rate:TAPP 2.2 kg/ha

Application Efficiency: APPEFF0.95 fraction

Spray Drift DRFT 0.039 fraction of application rate applied to pond

Application Date Date 15-05 dd/mm or dd/mmm or dd-mm or dd-mmm

Interval 1 interval 10 days Set to 0 or delete line for single app.

app. rate 1 apprate 1.1 kg/ha

Record 17: FILTRA

IPSCND1

UPTKF

Record 18: PLVKRT

PLDKRT

FEXTRC 0.5

Flag for Index Res. Run IR Reservoir

Flag for runoff calc. RUNOFF total none, monthly or total(average of entire run)
132

NC Tobacco

stored as NC Tobacco.out

Chemical: Chlorpyrifos

PRZM environment: NCtobaccoSTD.txt modified Tueday, 29 May 2007 at 13:59:12

EXAMS environment: ir298.exv modified Thuday, 29 August 2002 at 16:34:12

Metfile: w13722.dvf modified Wedday, 3 July 2002 at 10:05:50

Water segment concentrations (ppb)

Year Peak 96 hr 21 Day 60 Day 90 Day Yearly

1961 3.086 2.633 1.522 0.8865 0.6889 0.2778

1962 3.145 2.697 1.589 1.038 0.9504 0.4414

1963 3.171 2.724 1.616 1.282 1.034 0.4537

1964 3.207 2.751 1.63 1.161 0.9128 0.5209

1965 5.162 4.474 3.274 2.026 1.661 0.6891

1966 3.189 2.735 1.751 1.166 1.059 0.4671

1967 3.581 3.094 2.049 1.164 1.297 0.5174

1968 3.166 2.716 1.603 0.9288 0.7629 0.3486

1969 3.151 2.698 1.583 0.9368 0.7835 0.3976

1970 3.165 2.7 1.595 0.8586 0.6967 0.379

1971 3.159 2.703 1.587 1.075 0.8919 0.3961

1972 3.152 2.703 1.861 1.452 1.312 0.5559

1973 4.492 3.912 2.973 1.755 1.815 0.732

1974 3.195 2.747 1.685 1.4 1.089 0.4533

1975 3.273 2.806 1.656 0.95 0.7484 0.419

1976 3.167 2.723 1.618 1.055 0.8123 0.392

1977 3.19 2.747 1.643 0.9928 0.7673 0.46

1978 14.25 12.24 7.391 4 3.07 1.039

1979 3.199 2.755 1.658 0.9627 0.7751 0.4378

1980 4.317 3.706 2.21 1.173 1.177 0.5167

1981 3.18 2.731 1.62 0.99 0.8603 0.4325

1982 3.871 3.353 2.064 1.229 1.259 0.4765

1983 9.176 7.887 4.669 2.479 1.864 0.6101

1984 4.981 4.292 2.582 1.703 1.457 0.6144

1985 3.178 2.727 1.749 1.095 0.891 0.4243

1986 3.411 2.936 1.862 1.092 0.8682 0.4926

1987 10.1 9.094 5.419 2.71 2.039 0.7921

1988 4.158 3.586 2.467 1.379 1.044 0.4547

1989 3.666 3.15 2.153 1.397 1.121 0.4187

1990 3.135 2.688 1.751 1.307 1.018 0.3641

Sorted results

Prob. Peak 96 hr 21 Day 60 Day 90 Day Yearly

0.032258064516129 14.25 12.24 7.391 4 3.07 1.039

0.0645161290322581 10.1 9.094 5.419 2.71 2.039 0.7921

0.0967741935483871 9.176 7.887 4.669 2.479 1.864 0.732

0.129032258064516 5.162 4.474 3.274 2.026 1.815 0.6891

0.161290322580645 4.981 4.292 2.973 1.755 1.661 0.6144

0.193548387096774 4.492 3.912 2.582 1.703 1.457 0.6101

0.225806451612903 4.317 3.706 2.467 1.452 1.312 0.5559

0.258064516129032 4.158 3.586 2.21 1.4 1.297 0.5209

0.290322580645161 3.871 3.353 2.153 1.397 1.259 0.5174

0.32258064516129 3.666 3.15 2.064 1.379 1.177 0.5167

0.354838709677419 3.581 3.094 2.049 1.307 1.121 0.4926

0.387096774193548 3.411 2.936 1.862 1.282 1.089 0.4765

0.419354838709677 3.273 2.806 1.861 1.229 1.059 0.4671

0.451612903225806 3.207 2.755 1.751 1.173 1.044 0.46
133

0.483870967741936 3.199 2.751 1.751 1.166 1.034 0.4547

0.516129032258065 3.195 2.747 1.749 1.164 1.018 0.4537

0.548387096774194 3.19 2.747 1.685 1.161 0.9504 0.4533

0.580645161290323 3.189 2.735 1.658 1.095 0.9128 0.4414

0.612903225806452 3.18 2.731 1.656 1.092 0.8919 0.4378

0.645161290322581 3.178 2.727 1.643 1.075 0.891 0.4325

0.67741935483871 3.171 2.724 1.63 1.055 0.8682 0.4243

0.709677419354839 3.167 2.723 1.62 1.038 0.8603 0.419

0.741935483870968 3.166 2.716 1.618 0.9928 0.8123 0.4187

0.774193548387097 3.165 2.703 1.616 0.99 0.7835 0.3976

0.806451612903226 3.159 2.703 1.603 0.9627 0.7751 0.3961

0.838709677419355 3.152 2.7 1.595 0.95 0.7673 0.392

0.870967741935484 3.151 2.698 1.589 0.9368 0.7629 0.379

0.903225806451613 3.145 2.697 1.587 0.9288 0.7484 0.3641

0.935483870967742 3.135 2.688 1.583 0.8865 0.6967 0.3486

0.967741935483871 3.086 2.633 1.522 0.8586 0.6889 0.2778

0.1 8.7746 7.5457 4.5295 2.4337 1.8591 0.72771

Average of yearly averages: 0.499146666666667

Inputs generated by pe5.pl - Novemeber 2006

Data used for this run:

Output File: NC Tobacco

Metfile: w13722.dvf

PRZM scenario: NCtobaccoSTD.txt

EXAMS environment file: ir298.exv

Chemical Name: Chlorpyrifos

Description Variable Name Value Units Comments

Molecular weightmwt 350.6 g/mol

Henry's Law Const. henry 6.2e-6 atm-m^3/mol

Vapor Pressure vapr 1.87e-5 torr

Solubility sol 1.4 mg/L

Kd Kd mg/L

Koc Koc 6040 mg/L

Photolysis half-life kdp 29.6 days Half-life

Aerobic Aquatic Metabolism kbacw 91.5 days Halfife

Anaerobic Aquatic Metabolism kbacs 63 days Halfife

Aerobic Soil Metabolism asm 109 days Halfife

Hydrolysis: pH 7 81 days Half-life

Method: CAM 4 integer See PRZM manual

Incorporation Depth: DEPI 5.08 cm

Application Rate:TAPP 2.2 kg/ha

Application Efficiency: APPEFF0.95 fraction

Spray Drift DRFT 0.039 fraction of application rate applied to pond

Application Date Date 15-04 dd/mm or dd/mmm or dd-mm or dd-mmm

Record 17: FILTRA

IPSCND1

UPTKF

Record 18: PLVKRT

PLDKRT

FEXTRC 0.5

Flag for Index Res. Run IR Reservoir

Flag for runoff calc. RUNOFF total none, monthly or total(average of entire run)

PA Turf
134

stored as PA Turf_3 day interval at 4.4.out

Chemical: Chlorpyrifos

PRZM environment: PAturfSTD.txt modified Thuday, 23 February 2006 at 18:55:08

EXAMS environment: ir298.exv modified Thuday, 29 August 2002 at 16:34:12

Metfile: w14751.dvf modified Wedday, 3 July 2002 at 10:06:14

Water segment concentrations (ppb)

Year Peak 96 hr 21 Day 60 Day 90 Day Yearly

1961 126 109 68.07 53.36 42.78 14.45

1962 79.69 69.68 44.42 27.25 24.2 14.47

1963 26.26 22.96 14.77 13.01 11.94 9.505

1964 19.64 18.08 14.2 12.16 10.8 7.333

1965 29.82 26.62 18.13 11.63 9.695 7.068

1966 311 268 163 87.75 69.49 23.6

1967 97.57 89.5 58.93 43.55 35.47 22.3

1968 227 197 121 65.1 50.91 23.18

1969 462 399 290 152 115 42.42

1970 50.4 45.42 35.33 27.58 25.21 17.58

1971 274 237 147 90.07 69.56 25.46

1972 1610 1390 856 453 343 114

1973 228 198 123 69.25 55.03 40.69

1974 80.89 73.96 50.54 40.74 33.32 20.8

1975 513 444 278 149 115 40.49

1976 189 164 104 58.17 47.08 32.32

1977 25.41 25.19 24.36 22.73 21.94 13.1

1978 79.05 69.72 53.44 31.93 24.78 11.01

1979 76.16 66.45 44.47 28.64 22.94 14.93

1980 41.74 36.79 25.27 19.63 14.85 9.743

1981 33.65 29.86 23.76 16.65 14.8 9.655

1982 110 97.23 77.05 52.1 40.61 15.03

1983 60.32 53.52 34.67 14.77 11.6 8.282

1984 54.59 49.04 36.71 30.76 24.89 12.78

1985 51.09 44.49 28.02 16.97 14.34 8.83

1986 152 132 82.58 45.64 36.44 16.18

1987 79.11 69.37 49.16 30.83 27.27 16.42

1988 51.53 44.87 28.18 17.59 15.65 10.57

1989 80.55 71.15 46.94 38.61 33.92 15.92

1990 71.83 63.78 43.15 30.84 27.46 17.04

Sorted results

Prob. Peak 96 hr 21 Day 60 Day 90 Day Yearly

0.032258064516129 1610 1390 856 453 343 114

0.0645161290322581 513 444 290 152 115 42.42

0.0967741935483871 462 399 278 149 115 40.69

0.129032258064516 311 268 163 90.07 69.56 40.49

0.161290322580645 274 237 147 87.75 69.49 32.32

0.193548387096774 228 198 123 69.25 55.03 25.46

0.225806451612903 227 197 121 65.1 50.91 23.6

0.258064516129032 189 164 104 58.17 47.08 23.18

0.290322580645161 152 132 82.58 53.36 42.78 22.3

0.32258064516129 126 109 77.05 52.1 40.61 20.8

0.354838709677419 110 97.23 68.07 45.64 36.44 17.58

0.387096774193548 97.57 89.5 58.93 43.55 35.47 17.04

0.419354838709677 80.89 73.96 53.44 40.74 33.92 16.42

0.451612903225806 80.55 71.15 50.54 38.61 33.32 16.18

0.483870967741936 79.69 69.72 49.16 31.93 27.46 15.92
135

0.516129032258065 79.11 69.68 46.94 30.84 27.27 15.03

0.548387096774194 79.05 69.37 44.47 30.83 25.21 14.93

0.580645161290323 76.16 66.45 44.42 30.76 24.89 14.47

0.612903225806452 71.83 63.78 43.15 28.64 24.78 14.45

0.645161290322581 60.32 53.52 36.71 27.58 24.2 13.1

0.67741935483871 54.59 49.04 35.33 27.25 22.94 12.78

0.709677419354839 51.53 45.42 34.67 22.73 21.94 11.01

0.741935483870968 51.09 44.87 28.18 19.63 15.65 10.57

0.774193548387097 50.4 44.49 28.02 17.59 14.85 9.743

0.806451612903226 41.74 36.79 25.27 16.97 14.8 9.655

0.838709677419355 33.65 29.86 24.36 16.65 14.34 9.505

0.870967741935484 29.82 26.62 23.76 14.77 11.94 8.83

0.903225806451613 26.26 25.19 18.13 13.01 11.6 8.282

0.935483870967742 25.41 22.96 14.77 12.16 10.8 7.333

0.967741935483871 19.64 18.08 14.2 11.63 9.695 7.068

0.1 446.9 385.9 266.5 143.107 110.456 40.67

Average of yearly averages: 21.1718666666667

Inputs generated by pe5.pl - Novemeber 2006

Data used for this run:

Output File: PA Turf_3 day interval at 4.4

Metfile: w14751.dvf

PRZM scenario: PAturfSTD.txt

EXAMS environment file: ir298.exv

Chemical Name: Chlorpyrifos

Description Variable Name Value Units Comments

Molecular weightmwt 350.6 g/mol

Henry's Law Const. henry 6.2e-6 atm-m^3/mol

Vapor Pressure vapr 1.87e-5 torr

Solubility sol 1.4 mg/L

Kd Kd mg/L

Koc Koc 6040 mg/L

Photolysis half-life kdp 29.6 days Half-life

Aerobic Aquatic Metabolism kbacw 91.5 days Halfife

Anaerobic Aquatic Metabolism kbacs 63 days Halfife

Aerobic Soil Metabolism asm 109 days Halfife

Hydrolysis: pH 7 81 days Half-life

Method: CAM 2 integer See PRZM manual

Incorporation Depth: DEPI 0 cm

Application Rate:TAPP 4.4 kg/ha

Application Efficiency: APPEFF0.99 fraction

Spray Drift DRFT 0.01 fraction of application rate applied to pond

Application Date Date 09-05 dd/mm or dd/mmm or dd-mm or dd-mmm

Interval 1 interval 3 days Set to 0 or delete line for single app.

app. rate 1 apprate 4.4 kg/ha

Interval 2 interval 3 days Set to 0 or delete line for single app.

app. rate 2 apprate 4.4 kg/ha

Interval 3 interval 3 days Set to 0 or delete line for single app.

app. rate 3 apprate 4.4 kg/ha

Interval 4 interval 3 days Set to 0 or delete line for single app.

app. rate 4 apprate 4.4 kg/ha

Interval 5 interval 3 days Set to 0 or delete line for single app.

app. rate 5 apprate 4.4 kg/ha

Interval 6 interval 3 days Set to 0 or delete line for single app.
136

app. rate 6 apprate 4.4 kg/ha

Interval 7 interval 3 days Set to 0 or delete line for single app.

app. rate 7 apprate 4.4 kg/ha

Interval 8 interval 3 days Set to 0 or delete line for single app.

app. rate 8 apprate 4.4 kg/ha

Interval 9 interval 3 days Set to 0 or delete line for single app.

app. rate 9 apprate 4.4 kg/ha

Interval 10 interval 3 days Set to 0 or delete line for single app.

app. rate 10 apprate 4.4 kg/ha

Interval 11 interval 3 days Set to 0 or delete line for single app.

app. rate 11 apprate 4.4 kg/ha

Interval 12 interval 3 days Set to 0 or delete line for single app.

app. rate 12 apprate 4.4 kg/ha

Interval 13 interval 3 days Set to 0 or delete line for single app.

app. rate 13 apprate 4.4 kg/ha

Interval 14 interval 3 days Set to 0 or delete line for single app.

app. rate 14 apprate 4.4 kg/ha

Interval 15 interval 3 days Set to 0 or delete line for single app.

app. rate 15 apprate 4.4 kg/ha

Interval 16 interval 3 days Set to 0 or delete line for single app.

app. rate 16 apprate 4.4 kg/ha

Interval 17 interval 3 days Set to 0 or delete line for single app.

app. rate 17 apprate 4.4 kg/ha

Interval 18 interval 3 days Set to 0 or delete line for single app.

app. rate 18 apprate 4.4 kg/ha

Interval 19 interval 3 days Set to 0 or delete line for single app.

app. rate 19 apprate 4.4 kg/ha

Interval 20 interval 3 days Set to 0 or delete line for single app.

app. rate 20 apprate 4.4 kg/ha

Interval 21 interval 3 days Set to 0 or delete line for single app.

app. rate 21 apprate 4.4 kg/ha

Interval 22 interval 3 days Set to 0 or delete line for single app.

app. rate 22 apprate 4.4 kg/ha

Interval 23 interval 3 days Set to 0 or delete line for single app.

app. rate 23 apprate 4.4 kg/ha

Interval 24 interval 3 days Set to 0 or delete line for single app.

app. rate 24 apprate 4.4 kg/ha

Interval 25 interval 3 days Set to 0 or delete line for single app.

app. rate 25 apprate 4.4 kg/ha

Record 17: FILTRA

IPSCND1

UPTKF

Record 18: PLVKRT

PLDKRT

FEXTRC 0.5

Flag for Index Res. Run IR Reservoir

Flag for runoff calc. RUNOFF total none, monthly or total(average of entire run)

PA Turf alternative scenario (2 lbs ai/a)

stored as PA Turf_3 day interval at 2.2.out

Chemical: Chlorpyrifos

PRZM environment: PAturfSTD.txt modified Thuday, 23 February 2006 at 18:55:08

EXAMS environment: ir298.exv modified Thuday, 29 August 2002 at 16:34:12

Metfile: w14751.dvf modified Wedday, 3 July 2002 at 10:06:14

Water segment concentrations (ppb)
137

Year Peak 96 hr 21 Day 60 Day 90 Day Yearly

1961 62.96 54.72 34.04 26.68 21.39 7.226

1962 39.84 34.84 22.21 13.62 12.1 7.233

1963 13.13 11.48 7.384 6.504 5.969 4.752

1964 9.818 9.04 7.099 6.08 5.401 3.666

1965 14.91 13.31 9.063 5.813 4.848 3.534

1966 155 134 81.47 43.87 34.75 11.8

1967 48.79 44.75 29.46 21.77 17.74 11.15

1968 113 98.32 60.35 32.56 25.46 11.59

1969 231 199 145 75.88 57.41 21.2

1970 25.2 22.71 17.66 13.79 12.61 8.79

1971 137 119 73.57 45.03 34.77 12.73

1972 807 697 428 227 171 57.1

1973 114 98.98 61.48 34.63 27.52 20.35

1974 40.46 36.99 25.27 20.38 16.67 10.4

1975 257 222 139 74.6 57.75 20.25

1976 94.51 82.05 51.89 29.08 23.54 16.16

1977 12.7 12.6 12.18 11.37 10.97 6.552

1978 39.53 34.86 26.72 15.97 12.39 5.507

1979 38.08 33.22 22.23 14.32 11.47 7.464

1980 20.87 18.4 12.64 9.813 7.424 4.871

1981 16.82 14.93 11.88 8.326 7.401 4.827

1982 55.12 48.62 38.52 26.05 20.3 7.514

1983 30.16 26.76 17.34 7.384 5.798 4.141

1984 27.3 24.52 18.36 15.38 12.44 6.391

1985 25.55 22.25 14.01 8.485 7.169 4.415

1986 76.06 66.19 41.29 22.82 18.22 8.092

1987 39.56 34.69 24.58 15.42 13.64 8.209

1988 25.76 22.44 14.09 8.797 7.827 5.283

1989 40.28 35.58 23.47 19.3 16.96 7.957

1990 35.91 31.89 21.57 15.42 13.73 8.518

Sorted results

Prob. Peak 96 hr 21 Day 60 Day 90 Day Yearly

0.032258064516129 807 697 428 227 171 57.1

0.0645161290322581 257 222 145 75.88 57.75 21.2

0.0967741935483871 231 199 139 74.6 57.41 20.35

0.129032258064516 155 134 81.47 45.03 34.77 20.25

0.161290322580645 137 119 73.57 43.87 34.75 16.16

0.193548387096774 114 98.98 61.48 34.63 27.52 12.73

0.225806451612903 113 98.32 60.35 32.56 25.46 11.8

0.258064516129032 94.51 82.05 51.89 29.08 23.54 11.59

0.290322580645161 76.06 66.19 41.29 26.68 21.39 11.15

0.32258064516129 62.96 54.72 38.52 26.05 20.3 10.4

0.354838709677419 55.12 48.62 34.04 22.82 18.22 8.79

0.387096774193548 48.79 44.75 29.46 21.77 17.74 8.518

0.419354838709677 40.46 36.99 26.72 20.38 16.96 8.209

0.451612903225806 40.28 35.58 25.27 19.3 16.67 8.092

0.483870967741936 39.84 34.86 24.58 15.97 13.73 7.957

0.516129032258065 39.56 34.84 23.47 15.42 13.64 7.514

0.548387096774194 39.53 34.69 22.23 15.42 12.61 7.464

0.580645161290323 38.08 33.22 22.21 15.38 12.44 7.233

0.612903225806452 35.91 31.89 21.57 14.32 12.39 7.226

0.645161290322581 30.16 26.76 18.36 13.79 12.1 6.552

0.67741935483871 27.3 24.52 17.66 13.62 11.47 6.391

0.709677419354839 25.76 22.71 17.34 11.37 10.97 5.507
138

0.741935483870968 25.55 22.44 14.09 9.813 7.827 5.283

0.774193548387097 25.2 22.25 14.01 8.797 7.424 4.871

0.806451612903226 20.87 18.4 12.64 8.485 7.401 4.827

0.838709677419355 16.82 14.93 12.18 8.326 7.169 4.752

0.870967741935484 14.91 13.31 11.88 7.384 5.969 4.415

0.903225806451613 13.13 12.6 9.063 6.504 5.798 4.141

0.935483870967742 12.7 11.48 7.384 6.08 5.401 3.666

0.967741935483871 9.818 9.04 7.099 5.813 4.848 3.534

0.1 223.4 192.5 133.247 71.643 55.146 20.34

Average of yearly averages: 10.5890666666667

Inputs generated by pe5.pl - Novemeber 2006

Data used for this run:

Output File: PA Turf_3 day interval at 2.2

Metfile: w14751.dvf

PRZM scenario: PAturfSTD.txt

EXAMS environment file: ir298.exv

Chemical Name: Chlorpyrifos

Description Variable Name Value Units Comments

Molecular weightmwt 350.6 g/mol

Henry's Law Const. henry 6.2e-6 atm-m^3/mol

Vapor Pressure vapr 1.87e-5 torr

Solubility sol 1.4 mg/L

Kd Kd mg/L

Koc Koc 6040 mg/L

Photolysis half-life kdp 29.6 days Half-life

Aerobic Aquatic Metabolism kbacw 91.5 days Halfife

Anaerobic Aquatic Metabolism kbacs 63 days Halfife

Aerobic Soil Metabolism asm 109 days Halfife

Hydrolysis: pH 7 81 days Half-life

Method: CAM 2 integer See PRZM manual

Incorporation Depth: DEPI 0 cm

Application Rate:TAPP 2.2 kg/ha

Application Efficiency: APPEFF0.99 fraction

Spray Drift DRFT 0.01 fraction of application rate applied to pond

Application Date Date 09-05 dd/mm or dd/mmm or dd-mm or dd-mmm

Interval 1 interval 3 days Set to 0 or delete line for single app.

app. rate 1 apprate 2.2 kg/ha

Interval 2 interval 3 days Set to 0 or delete line for single app.

app. rate 2 apprate 2.2 kg/ha

Interval 3 interval 3 days Set to 0 or delete line for single app.

app. rate 3 apprate 2.2 kg/ha

Interval 4 interval 3 days Set to 0 or delete line for single app.

app. rate 4 apprate 2.2 kg/ha

Interval 5 interval 3 days Set to 0 or delete line for single app.

app. rate 5 apprate 2.2 kg/ha

Interval 6 interval 3 days Set to 0 or delete line for single app.

app. rate 6 apprate 2.2 kg/ha

Interval 7 interval 3 days Set to 0 or delete line for single app.

app. rate 7 apprate 2.2 kg/ha

Interval 8 interval 3 days Set to 0 or delete line for single app.

app. rate 8 apprate 2.2 kg/ha

Interval 9 interval 3 days Set to 0 or delete line for single app.

app. rate 9 apprate 2.2 kg/ha
139

Interval 10 interval 3 days Set to 0 or delete line for single app.

app. rate 10 apprate 2.2 kg/ha

Interval 11 interval 3 days Set to 0 or delete line for single app.

app. rate 11 apprate 2.2 kg/ha

Interval 12 interval 3 days Set to 0 or delete line for single app.

app. rate 12 apprate 2.2 kg/ha

Interval 13 interval 3 days Set to 0 or delete line for single app.

app. rate 13 apprate 2.2 kg/ha

Interval 14 interval 3 days Set to 0 or delete line for single app.

app. rate 14 apprate 2.2 kg/ha

Interval 15 interval 3 days Set to 0 or delete line for single app.

app. rate 15 apprate 2.2 kg/ha

Interval 16 interval 3 days Set to 0 or delete line for single app.

app. rate 16 apprate 2.2 kg/ha

Interval 17 interval 3 days Set to 0 or delete line for single app.

app. rate 17 apprate 2.2 kg/ha

Interval 18 interval 3 days Set to 0 or delete line for single app.

app. rate 18 apprate 2.2 kg/ha

Interval 19 interval 3 days Set to 0 or delete line for single app.

app. rate 19 apprate 2.2 kg/ha

Interval 20 interval 3 days Set to 0 or delete line for single app.

app. rate 20 apprate 2.2 kg/ha

Interval 21 interval 3 days Set to 0 or delete line for single app.

app. rate 21 apprate 2.2 kg/ha

Interval 22 interval 3 days Set to 0 or delete line for single app.

app. rate 22 apprate 2.2 kg/ha

Interval 23 interval 3 days Set to 0 or delete line for single app.

app. rate 23 apprate 2.2 kg/ha

Interval 24 interval 3 days Set to 0 or delete line for single app.

app. rate 24 apprate 2.2 kg/ha

Interval 25 interval 3 days Set to 0 or delete line for single app.

app. rate 25 apprate 2.2 kg/ha

Record 17: FILTRA

IPSCND1

UPTKF

Record 18: PLVKRT

PLDKRT

FEXTRC 0.5

Flag for Index Res. Run IR Reservoir

Flag for runoff calc. RUNOFF total none, monthly or total(average of entire run)

PA Turf alternative scenario (applications specifically listed on label)

stored as PA Turf_eg.out

Chemical: Chlorpyrifos

PRZM environment: PAturfSTD.txt modified Thuday, 23 February 2006 at 18:55:08

EXAMS environment: ir298.exv modified Thuday, 29 August 2002 at 16:34:12

Metfile: w14751.dvf modified Wedday, 3 July 2002 at 10:06:14

Water segment concentrations (ppb)

Year Peak 96 hr 21 Day 60 Day 90 Day Yearly

1961 11.01 10.21 6.646 4.185 3.472 1.201

1962 13.27 11.57 7.287 4.39 3.875 1.832

1963 4.441 3.887 2.508 2.105 1.861 1.459

1964 3.751 3.282 2.228 1.606 1.417 1.106

1965 4.935 4.408 3.005 1.93 1.639 1.068

1966 45.83 39.59 24.08 13.01 10.31 3.551
140

1967 9.817 8.984 6.059 4.11 3.692 2.794

1968 39.9 34.59 21.28 11.52 9.026 3.698

1969 22.51 20.53 14.88 8.216 6.299 3.246

1970 3.228 2.869 2.31 2.007 1.878 1.496

1971 25.93 22.45 13.93 9.405 7.291 2.759

1972 128 111 67.23 35.36 26.93 9.515

1973 41.41 35.94 22.21 12.4 9.819 5.176

1974 13.71 12.8 8.584 5.833 4.859 3.208

1975 92.12 79.72 49.95 26.9 20.85 6.607

1976 35.9 31.19 19.78 11.16 9.032 5.703

1977 4.961 4.921 4.76 4.445 4.263 2.407

1978 5.237 4.606 3.55 2.408 2.105 1.267

1979 13.75 12 8.018 5.212 4.164 2.33

1980 7.437 6.567 4.54 3.539 2.689 1.657

1981 3.565 3.159 2.424 2.111 2.007 1.425

1982 17.91 15.62 11.64 6.994 5.558 2.21

1983 9.631 8.56 5.592 2.689 2.209 1.501

1984 9.941 8.731 5.845 3.862 3.27 1.966

1985 8.837 7.705 4.881 2.981 2.528 1.519

1986 15.82 13.77 8.599 5.078 3.997 2.024

1987 13.41 11.74 8.42 5.21 4.581 2.346

1988 3.368 2.965 2.373 2.224 2.042 1.424

1989 8.421 7.387 5.387 3.609 3.387 1.991

1990 13.94 12.15 7.603 4.36 3.846 2.575

Sorted results

Prob. Peak 96 hr 21 Day 60 Day 90 Day Yearly

0.032258064516129 128 111 67.23 35.36 26.93 9.515

0.0645161290322581 92.12 79.72 49.95 26.9 20.85 6.607

0.0967741935483871 45.83 39.59 24.08 13.01 10.31 5.703

0.129032258064516 41.41 35.94 22.21 12.4 9.819 5.176

0.161290322580645 39.9 34.59 21.28 11.52 9.032 3.698

0.193548387096774 35.9 31.19 19.78 11.16 9.026 3.551

0.225806451612903 25.93 22.45 14.88 9.405 7.291 3.246

0.258064516129032 22.51 20.53 13.93 8.216 6.299 3.208

0.290322580645161 17.91 15.62 11.64 6.994 5.558 2.794

0.32258064516129 15.82 13.77 8.599 5.833 4.859 2.759

0.354838709677419 13.94 12.8 8.584 5.212 4.581 2.575

0.387096774193548 13.75 12.15 8.42 5.21 4.263 2.407

0.419354838709677 13.71 12 8.018 5.078 4.164 2.346

0.451612903225806 13.41 11.74 7.603 4.445 3.997 2.33

0.483870967741936 13.27 11.57 7.287 4.39 3.875 2.21

0.516129032258065 11.01 10.21 6.646 4.36 3.846 2.024

0.548387096774194 9.941 8.984 6.059 4.185 3.692 1.991

0.580645161290323 9.817 8.731 5.845 4.11 3.472 1.966

0.612903225806452 9.631 8.56 5.592 3.862 3.387 1.832

0.645161290322581 8.837 7.705 5.387 3.609 3.27 1.657

0.67741935483871 8.421 7.387 4.881 3.539 2.689 1.519

0.709677419354839 7.437 6.567 4.76 2.981 2.528 1.501

0.741935483870968 5.237 4.921 4.54 2.689 2.209 1.496

0.774193548387097 4.961 4.606 3.55 2.408 2.105 1.459

0.806451612903226 4.935 4.408 3.005 2.224 2.042 1.425

0.838709677419355 4.441 3.887 2.508 2.111 2.007 1.424

0.870967741935484 3.751 3.282 2.424 2.105 1.878 1.267

0.903225806451613 3.565 3.159 2.373 2.007 1.861 1.201

0.935483870967742 3.368 2.965 2.31 1.93 1.639 1.106
141

0.967741935483871 3.228 2.869 2.228 1.606 1.417 1.068

0.1 45.388 39.225 23.893 12.949 10.2609 5.6503

Average of yearly averages: 2.70203333333333

Inputs generated by pe5.pl - Novemeber 2006

Data used for this run:

Output File: PA Turf_eg

Metfile: w14751.dvf

PRZM scenario: PAturfSTD.txt

EXAMS environment file: ir298.exv

Chemical Name: Chlorpyrifos

Description Variable Name Value Units Comments

Molecular weightmwt 350.6 g/mol

Henry's Law Const. henry 6.2e-6 atm-m^3/mol

Vapor Pressure vapr 1.87e-5 torr

Solubility sol 1.4 mg/L

Kd Kd mg/L

Koc Koc 6040 mg/L

Photolysis half-life kdp 29.6 days Half-life

Aerobic Aquatic Metabolism kbacw 91.5 days Halfife

Anaerobic Aquatic Metabolism kbacs 63 days Halfife

Aerobic Soil Metabolism asm 109 days Halfife

Hydrolysis: pH 7 81 days Half-life

Method: CAM 2 integer See PRZM manual

Incorporation Depth: DEPI 0 cm

Application Rate:TAPP 2.2 kg/ha

Application Efficiency: APPEFF0.99 fraction

Spray Drift DRFT 0.01 fraction of application rate applied to pond

Application Date Date 15-04 dd/mm or dd/mmm or dd-mm or dd-mmm

Interval 1 interval 30 days Set to 0 or delete line for single app.

app. rate 1 apprate 2.2 kg/ha

Interval 2 interval 7 days Set to 0 or delete line for single app.

app. rate 2 apprate 1.1 kg/ha

Interval 3 interval 7 days Set to 0 or delete line for single app.

app. rate 3 apprate 1.1 kg/ha

Interval 4 interval 60 days Set to 0 or delete line for single app.

app. rate 4 apprate 4.4 kg/ha

Interval 5 interval 30 days Set to 0 or delete line for single app.

app. rate 5 apprate 4.4 kg/ha

Record 17: FILTRA

IPSCND1

UPTKF

Record 18: PLVKRT

PLDKRT

FEXTRC 0.5

Flag for Index Res. Run IR Reservoir

Flag for runoff calc. RUNOFF total none, monthly or total(average of entire run)
142

APPENDIX B

SCI-GROW Output Files 

 

SCIGROW VERSION 2.3

CHEMICAL:CHLORPYRIFOS

TIME IS 4/ 6/2011 12:21: 2

------------------------------------------------------------------------

 APPLICATION NUMBER OF TOTAL USE KOC SOIL AEROBIC

 RATE (LB/ACRE) APPLICATIONS (LB/ACRE/YR) (ML/G) METABOLISM (DAYS)

------------------------------------------------------------------------

 1.000 1.0 1.000 5.86E+03 68.0

------------------------------------------------------------------------

GROUNDWATER SCREENING COND (PPB) = 1.03E-02 

************************************************************************

SCIGROW VERSION 2.3

CHEMICAL:CHLORPYRIFOS

TIME IS 4/13/2011 17:23:41

------------------------------------------------------------------------

 APPLICATION NUMBER OF TOTAL USE KOC SOIL AEROBIC

 RATE (LB/ACRE) APPLICATIONS (LB/ACRE/YR) (ML/G) METABOLISM (DAYS)

------------------------------------------------------------------------

 1.500 1.0 1.500 5.86E+03 68.0

------------------------------------------------------------------------

GROUNDWATER SCREENING COND (PPB) = 1.55E-02 

************************************************************************

SCIGROW VERSION 2.3

CHEMICAL:CHLORPYRIFOS

TIME IS 4/13/2011 17:23:55

------------------------------------------------------------------------

 APPLICATION NUMBER OF TOTAL USE KOC SOIL AEROBIC

 RATE (LB/ACRE) APPLICATIONS (LB/ACRE/YR) (ML/G) METABOLISM (DAYS)

------------------------------------------------------------------------

 2.000 1.0 2.000 5.86E+03 68.0

------------------------------------------------------------------------

GROUNDWATER SCREENING COND (PPB) = 2.06E-02 

************************************************************************

SCIGROW VERSION 2.3

CHEMICAL:CHLORPYRIFOS

TIME IS 4/ 6/2011 8:30:25

------------------------------------------------------------------------

 APPLICATION NUMBER OF TOTAL USE KOC SOIL AEROBIC

 RATE (LB/ACRE) APPLICATIONS (LB/ACRE/YR) (ML/G) METABOLISM (DAYS)

------------------------------------------------------------------------

 3.000 1.0 3.000 5.86E+03 68.0

------------------------------------------------------------------------

GROUNDWATER SCREENING COND (PPB) = 3.09E-02 

************************************************************************

SCIGROW VERSION 2.3

CHEMICAL:CHLORPYRIFOS

TIME IS 4/ 7/2011 14:37:37

------------------------------------------------------------------------
143

 APPLICATION NUMBER OF TOTAL USE KOC SOIL AEROBIC

 RATE (LB/ACRE) APPLICATIONS (LB/ACRE/YR) (ML/G) METABOLISM (DAYS)

------------------------------------------------------------------------

 4.000 1.0 4.000 5.86E+03 68.0

------------------------------------------------------------------------

GROUNDWATER SCREENING COND (PPB) = 4.12E-02 

************************************************************************

SCIGROW VERSION 2.3

CHEMICAL:CHLORPYRIFOSTIME IS 4/ 7/2011 13:20:44

------------------------------------------------------------------------

 APPLICATION NUMBER OF TOTAL USE KOC SOIL AEROBIC

 RATE (LB/ACRE) APPLICATIONS (LB/ACRE/YR) (ML/G) METABOLISM (DAYS)

------------------------------------------------------------------------

 2.000 2.0 4.000 5.86E+03 68.0

------------------------------------------------------------------------

GROUNDWATER SCREENING COND (PPB) = 4.12E-02 

************************************************************************

SCIGROW VERSION 2.3

CHEMICAL:CHLORPYRIFOSTIME IS 4/ 7/2011 12:59:49

------------------------------------------------------------------------

 APPLICATION NUMBER OF TOTAL USE KOC SOIL AEROBIC

 RATE (LB/ACRE) APPLICATIONS (LB/ACRE/YR) (ML/G) METABOLISM (DAYS)

------------------------------------------------------------------------

 2.000 3.0 6.000 5.86E+03 68.0

------------------------------------------------------------------------

GROUNDWATER SCREENING COND (PPB) = 6.19E-02 

************************************************************************

SCIGROW VERSION 2.3

CHEMICAL:CHLORPYRIFOS

TIME IS 4/ 7/2011 14:47:49

------------------------------------------------------------------------

 APPLICATION NUMBER OF TOTAL USE KOC SOIL AEROBIC

 RATE (LB/ACRE) APPLICATIONS (LB/ACRE/YR) (ML/G) METABOLISM (DAYS)

------------------------------------------------------------------------

 9.000 1.0 9.000 5.86E+03 68.0

------------------------------------------------------------------------

GROUNDWATER SCREENING COND (PPB) = 9.28E-02 

************************************************************************ 

SCIGROW VERSION 2.3

CHEMICAL:CHLORPYRIFOS

TIME IS 4/13/2011 14:37: 0

------------------------------------------------------------------------

 APPLICATION NUMBER OF TOTAL USE KOC SOIL AEROBIC

 RATE (LB/ACRE) APPLICATIONS (LB/ACRE/YR) (ML/G) METABOLISM (DAYS)

------------------------------------------------------------------------

 10.000 1.0 10.000 5.86E+03 68.0

------------------------------------------------------------------------

GROUNDWATER SCREENING COND (PPB) = 1.03E-01 

************************************************************************

SCIGROW VERSION 2.3
144

CHEMICAL:CHLORPYRIFOS

TIME IS 4/ 6/2011 8:36: 5

------------------------------------------------------------------------

 APPLICATION NUMBER OF TOTAL USE KOC SOIL AEROBIC

 RATE (LB/ACRE) APPLICATIONS (LB/ACRE/YR) (ML/G) METABOLISM (DAYS)

------------------------------------------------------------------------

 12.000 1.0 12.000 5.86E+03 68.0

------------------------------------------------------------------------

GROUNDWATER SCREENING COND (PPB) = 1.24E-01 

************************************************************************

SCIGROW VERSION 2.3

CHEMICAL:CHLORPYRIFOS

TIME IS 4/ 6/2011 14:54:13

------------------------------------------------------------------------

 APPLICATION NUMBER OF TOTAL USE KOC SOIL AEROBIC

 RATE (LB/ACRE) APPLICATIONS (LB/ACRE/YR) (ML/G) METABOLISM (DAYS)

------------------------------------------------------------------------

 33.300 1.0 33.300 5.86E+03 68.0

------------------------------------------------------------------------

GROUNDWATER SCREENING COND (PPB) = 3.43E-01 

************************************************************************
145

APPENDIX C

Water Monitoring Data for Chlorpyrifos and Chlorpyrifos-oxon 

Table C1. Qualified (actual or estimated) Detections of Chlorpyrifos in Surface Water. Data 

from United States Geological Survey National Water Quality Assessment (USGS NAWQA)

accessed May 21, 2010. Data was previously reported (DP 059101).

Country State Station 

Identification

Land Use Year

Detection

Total

Average

Max

(ppb)

BIBB AL 02424000 Mixed 1999 10

0.008926

0.0246

2000 7

0.008267

0.0151

2001 2

0.003375

0.00483

CALHOUN AL 02401749 Urban 2001 1

0.00567

0.00567

02403380 Urban 2001 1

0.00866

0.00866

CHOCTAW AL 02469762 Mixed 1999 1

0.00678

0.00678

2000 1

0.00331

0.00331

2004 1

0.0098

0.0098

JEFFERSON AL 02423515 Urban 2001 2

0.005725

0.00925

02423590 Urban 2000 1

0.0116

0.0116

2001 1

0.00817

0.00817

02456900 Urban 2001 1

0.00311

0.00311
146

Country State Station 

Identification

Land Use Year

Detection

Total

Average

Max

(ppb)

02461200 Urban 2001 1

0.00744

0.00744

MADISON AL 0357479650 Cropland 2000 1

0.0151

0.0151

03575100 Mixed 2000 2

0.009925

0.0151

2001 1

0.0056

0.0056

2002 1

0.0041

0.0041

MONROE AL 02429500 Mixed 2000 1

0.00529

0.00529

MONTGOMERY AL 02419977 Not Applicable 1999 10

0.018106

0.068

2000 9

0.016876

0.0654

2001 9

0.02042

0.127

PICKENS AL 02444490 Cropland 1999 9

0.066909

0.213

2000 3

0.084267

0.211

2001 2

0.0058

0.0063

2002 2

0.03495

0.0648

2003 2

0.02595

0.0352

2004 2

0.01475

0.0258
147

Country State Station 

Identification

Land Use Year

Detection

Total

Average

Max

(ppb)

SHELBY AL 0242354750 Urban 1999 10

0.003841

0.00562

2000 7

0.005144

0.0112

2001 4

0.010703

0.0299

2002 1

0.0114

0.0114

2003 1

0.0024

0.0024

2004 1

0.0046

0.0046

2005 4

0.005725

0.0106

2006 1

0.0104

0.0104

2009 1

0.0047

0.0047

ST AL 0242339580 Urban 2000 1

0.00264

0.00264

2001 1

0.0111

0.0111

CARROLL AR 07050500 Mixed 1995 1

0.003

0.003

PULASKI AR 07263620 Not Applicable 1995 1

0.005

0.005

1996 2

0.0048

0.005

1998 1

0.00336

0.00336
148

Country State Station 

Identification

Land Use Year

Detection

Total

Average

Max

(ppb)

2000 1

0.0035

0.0035

MARICOPA AZ 09513990 Mixed 1996 2

0.0245

0.033

09514100 Agriculture 1998 1

0.00752

0.00752

09517000 Agriculture 1996 3

0.021033

0.0221

1997 30

0.036389

0.154

1998 4

0.01187

0.0195

2009 3

0.007433

0.0084

SANTA AZ 09481740 Urban 2009 1

0.0037

0.0037

YUMA AZ 09522000 Not Applicable 1996 1

0.0048

0.0048

2009 2

0.0068

0.0087

IMPERIAL CA 09429490 Not Applicable 1996 2

0.0058

0.0088

1997 1

0.0025

0.0025

2000 1

0.00498

0.00498

MERCED CA 11260815 Mixed 2000 14

0.011286

0.0734

2001 15

0.005377

0.014
149

Country State Station 

Identification

Land Use Year

Detection

Total

Average

Max

(ppb)

11261100 Agriculture 1993 17

0.019824

0.052

2001 8

0.070598

0.4

11262900 Agriculture 1999 1

0.016

0.016

2001 19

0.00663

0.0256

11273500 Mixed 1993 30

0.0378

0.26

1994 17

0.038412

0.097

1997 7

0.00644

0.0107

1998 5

0.005566

0.00974

1999 2

0.004055

0.00455

2000 20

0.006628

0.0151

2001 30

0.006772

0.0254

2002 5

0.00424

0.0066

2003 6

0.008333

0.0151

2004 3

0.015467

0.0206

2005 5

0.00548

0.0068
150

Country State Station 

Identification

Land Use Year

Detection

Total

Average

Max

(ppb)

2006 3

0.0054

0.0069

2008 2

0.0053

0.0063

2009 9

0.006844

0.0127

371521120390800 Mixed 1994 1

0.003

0.003

2000 1

0.00406

0.00406

2001 1

0.0185

0.0185

371903120585400 Agriculture 2000 7

0.016894

0.0373

2001 2

0.01305

0.0135

372323120481700 Agriculture 1994 2

0.23

0.24

2000 10

0.006421

0.0111

2001 1

0.003

0.003

2002 1

0.0071

0.0071

2004 3

0.104533

0.13

372424120432800 Mixed 1994 2

0.048

0.048

2000 10

0.007988

0.0117
151

Country State Station 

Identification

Land Use Year

Detection

Total

Average

Max

(ppb)

2001 1

0.0051

0.0051

372829120420801 Not Applicable 2002 4

0.0047

0.0056

372839120413901 Not Applicable 2004 17

0.093835

0.3

373012120393401 Not Applicable 2002 3

0.0059

0.0074

373020120385201 Not Applicable 2003 1

0.0287

0.0287

373112120382901 Not Applicable 2002 4

0.024775

0.0676

2003 3

0.008567

0.0097

2004 15

0.056893

0.143

373115120382801 Not Applicable 2002 1

0.0072

0.0072

2003 13

0.009592

0.0188

2004 9

0.033744

0.0527

ORANGE CA 11075610 Mixed 1998 1

0.00228

0.00228

1999 7

0.022401

0.0568

2000 7

0.032006

0.129

2001 2

0.005355

0.00608
152

Country State Station 

Identification

Land Use Year

Detection

Total

Average

Max

(ppb)

RIVERSIDE CA 11074000 Mixed 2001 2

0.006925

0.008

2008 1

0.0146

0.0146

SACRAMENTO CA 11447360 Urban 1996 2

0.03125

0.0358

1997 18

0.013972

0.0445

1998 2

0.02395

0.0242

2001 6

0.005775

0.00857

2002 3

0.0095

0.016

2003 5

0.01028

0.0224

2004 6

0.009433

0.0213

2005 10

0.00997

0.0238

2006 3

0.0067

0.0092

2008 6

0.007517

0.009

11447650 Mixed 1997 1

0.0032

0.0032

2000 2

0.004525

0.00585

2002 1

0.0038

0.0038
153

Country State Station 

Identification

Land Use Year

Detection

Total

Average

Max

(ppb)

2003 1

0.0037

0.0037

2004 3

0.007433

0.0118

2005 6

0.006417

0.0084

2006 8

0.005113

0.0065

2007 6

0.00425

0.0066

2008 5

0.00402

0.0044

2009 2

0.0058

0.0087

SAN CA 11060400 Urban 1998 1

0.00226

0.00226

1999 4

0.016153

0.0456

2000 3

0.004807

0.00528

11073495 Urban 1999 1

0.0356

0.0356

335910117425801 Residential 2000 1

0.0123

0.0123

SAN CA 11303500 Mixed 1992 16

0.0105

0.016

1993 18

0.016722

0.033

1994 24

0.012708

0.029
154

Country State Station 

Identification

Land Use Year

Detection

Total

Average

Max

(ppb)

19954

0.01625

0.026

19976

0.00947

0.0142

19983

0.005023

0.00699

19991

0.00564

0.00564

2000 35

0.006595

0.0174

2001 43

0.00587

0.0122

2002 15

0.01016

0.0361

2003 10

0.00832

0.0225

20046

0.014167

0.055

20052

0.00685

0.0093

20064

0.0052

0.0062

2007 19

0.005684

0.0092

2008 16

0.008075

0.0178

2009 12

0.006425

0.0092

20101

0.0064

0.0064
155

Country State Station 

Identification

Land Use Year

Detection

Total

Average

Max

(ppb)

STANISLAUS CA 11274538 Agriculture 1992 46

0.034457

0.3

1993 26

0.038192

0.14

1994 1

0.27

0.27

1995 1

0.086

0.086

1997 9

0.02871

0.112

1998 9

0.022456

0.068

1999 5

0.023286

0.0416

2000 21

0.017058

0.179

2001 32

0.020397

0.149

2002 11

0.019118

0.0484

2003 10

0.02871

0.116

2004 5

0.00946

0.0194

2005 4

0.0116

0.0264

2006 4

0.028225

0.067

2009 1

0.0118

0.0118
156

Country State Station 

Identification

Land Use Year

Detection

Total

Average

Max

(ppb)

2010 2

0.0052

0.0052

11274554 Agriculture 1994 1

0.029

0.029

2001 2

0.0077

0.0085

11274560 Agriculture 1992 20

0.0265

0.06

1993 1

0.029

0.029

1994 1

0.014

0.014

1999 1

0.0049

0.0049

2000 8

0.008464

0.0126

2001 2

0.00985

0.0121

11274570 Mixed 1994 5

0.0146

0.03

2000 1

0.00741

0.00741

2001 22

0.005081

0.0108

11274653 Agriculture 1994 1

0.037

0.037

2000 5

0.006722

0.0091

2001 13

0.027608

0.12
157

Country State Station 

Identification

Land Use Year

Detection

Total

Average

Max

(ppb)

11290000 Mixed 1993 1

0.003

0.003

1994 17

0.013824

0.032

1995 1

0.008

0.008

11290200 Mixed 1994 1

0.013

0.013

2000 17

0.006079

0.0176

2001 32

0.007323

0.0208

11290500 Mixed 2001 14

0.007141

0.0146

11303000 Mixed 1994 1

0.015

0.015

373027121051401 Agriculture 1994 1

0.27

0.27

2001 2

0.007

0.0075

373232121053900 Agriculture 1994 1

0.015

0.015

2001 1

0.0152

0.0152

373621121102801 Mixed 1994 4

0.0115

0.02

2001 2

0.0074

0.009

373632121014701 Mixed 1995 6

0.006

0.01
158

Country State Station 

Identification

Land Use Year

Detection

Total

Average

Max

(ppb)

373639120551001 Agriculture 1995 1

0.021

0.021

373731120595401 Urban 1995 1

0.031

0.031

373747121125200 Agriculture 1994 1

0.007

0.007

2001 1

0.0212

0.0212

373749120593701 Urban 1995 1

0.05

0.05

373753120441101 Agriculture 1995 1

0.007

0.007

373811120590001 Urban 1995 6

0.058667

0.093

2000 7

0.008403

0.0204

373842121131800 Agriculture 1994 1

0.02

0.02

373847120590801 Urban 1995 6

0.069833

0.079

2001 9

0.026071

0.0352

373910120570601 Urban 1995 1

0.25

0.25

373925120550701 Agriculture 1995 3

0.005

0.006

2000 12

0.00685

0.0253

373927120551301 Urban 1995 1

0.3

0.3
159

Country State Station 

Identification

Land Use Year

Detection

Total

Average

Max

(ppb)

374024120462401 Agriculture 1995 1

0.008

0.008

374111121000301 Not Applicable 2005 1

0.0185

0.0185

374115120591601 Not Applicable 2005 1

0.0222

0.0222

374209121103800 Mixed 2000 15

0.005366

0.00962

2001 28

0.010495

0.0998

SUTTER CA 11391100 Cropland 2001 1

0.00154

0.00154

2002 1

0.0111

0.0111

2003 1

0.0096

0.0096

2004 2

0.0174

0.0192

YOLO CA 11390890 Cropland 1997 6

0.011797

0.0164

ADAMS CO 06720500 Not Applicable 1994 2

0.0065

0.007

BOULDER CO 400855105090501 Not Applicable 2003 1

0.0066

0.0066

DENVER CO 06713500 Urban 1993 9

0.055667

0.3

1994 6

0.098167

0.34

2008 1

0.0057

0.0057
160

Country State Station 

Identification

Land Use Year

Detection

Total

Average

Max

(ppb)

2009 2

0.00635

0.0071

06714000 Urban 1994 5

0.0414

0.11

1998 1

0.0045

0.0045

1999 1

0.00896

0.00896

MESA CO 09153290 Agriculture 1997 13

0.005778

0.0131

1998 1

0.00288

0.00288

09163500 Mixed 1997 2

0.003115

0.00326

2000 1

0.0077

0.0077

2004 1

0.0038

0.0038

MONTROSE CO 09149480 Agriculture 1997 2

0.00372

0.00379

WELD CO 06721000 Mixed 1994 1

0.008

0.008

06731000 Mixed 2001 1

0.0091

0.0091

06744000 Mixed 1994 1

0.035

0.035

2001 1

0.0021

0.0021

06753990 Agriculture 1993 6

0.051167

0.22
161

Country State Station 

Identification

Land Use Year

Detection

Total

Average

Max

(ppb)

1994 3

0.014

0.02

2001 1

0.0151

0.0151

2003 2

0.00425

0.0049

06754000 Mixed 1997 1

0.00171

0.00171

1998 2

0.0274

0.0491

2000 1

0.00312

0.00312

2002 1

0.0172

0.0172

2003 1

0.0045

0.0045

401910104483900 Mixed 1994 1

0.005

0.005

402238104402500 Mixed 1994 1

0.008

0.008

FAIRFIELD CT 01209710 Urban 1997 2

0.0034

0.00355

2002 1

0.0048

0.0048

HARTFORD CT 01184000 Mixed 1994 1

0.014

0.014

1997 1

0.00276

0.00276

2000 1

0.00238

0.00238
162

Country State Station 

Identification

Land Use Year

Detection

Total

Average

Max

(ppb)

2008 2

0.0053

0.0056

01189000 Urban 1994 1

0.026

0.026

NEW CT 01208500 Mixed 1994 3

0.007333

0.009

DISTRICT DC 01648010 Not Applicable 2000 4

0.005708

0.00816

DE FL 02296750 Mixed 2001 1

0.004

0.004

HILLSBOROUGH FL 02306647 Urban 1994 1

0.017

0.017

LEON FL 02326838 Urban 1993 9

0.012667

0.028

1994 22

0.010541

0.018

1995 3

0.009533

0.0127

02329000 Mixed 1994 25

0.00368

0.006

MIAMI-DADE FL 252414080333200 Cropland 1997 11

0.006333

0.0126

1998 1

0.00562

0.00562

1999 4

0.010788

0.0234

2000 2

0.007875

0.0113

2001 1

0.00249

0.00249
163

Country State Station 

Identification

Land Use Year

Detection

Total

Average

Max

(ppb)

2002 3

0.0137

0.0324

2003 3

0.008367

0.0108

2004 4

0.01945

0.0456

252523080352500 Cropland 1997 1

0.00931

0.00931

ORANGE FL 02233200 Urban 1994 1

0.008

0.008

PALM FL 02281200 Cropland 1997 3

0.004757

0.00586

1998 1

0.00292

0.00292

1999 1

0.00694

0.00694

2000 1

0.00331

0.00331

2001 2

0.00436

0.00552

2002 2

0.0115

0.0155

2003 1

0.0261

0.0261

2005 4

0.00735

0.0107

2006 3

0.006133

0.0077

2007 1

0.0048

0.0048
164

Country State Station 

Identification

Land Use Year

Detection

Total

Average

Max

(ppb)

SEMINOLE FL 02234990 Urban 1994 2

0.016

0.026

BAKER GA 02353000 Mixed 1994 12

0.008

0.015

BROOKS GA 02318500 Mixed 1993 2

0.0065

0.008

1995 4

0.007375

0.01

1998 1

0.00551

0.00551

1999 1

0.00505

0.00505

2000 3

0.006483

0.00928

2001 1

0.00267

0.00267

2002 1

0.0056

0.0056

2003 1

0.0033

0.0033

2005 1

0.0045

0.0045

CARROLL GA 02337500 Reference 1997 1

0.0737

0.0737

02338000 Mixed 1994 2

0.008

0.009

1995 3

0.012

0.018

1997 4

0.005583

0.00841
165

Country State Station 

Identification

Land Use Year

Detection

Total

Average

Max

(ppb)

1998 2

0.007815

0.0121

1999 1

0.00712

0.00712

2000 2

0.006165

0.0073

2005 2

0.0057

0.0065

2006 1

0.0061

0.0061

COBB GA 02335850 Residential 1994 1

0.005

0.005

1995 1

0.006

0.006

02335860 Residential 1994 1

0.004

0.004

02335864 Residential 1995 1

0.003

0.003

02335865 Residential 1994 1

0.004

0.004

02335868 Residential 1995 1

0.006

0.006

02335869 Residential 1994 1

0.004

0.004

023358694 Residential 1993 2

0.047

0.051

1994 12

0.013833

0.025

1995 4

0.016

0.029
166

Country State Station 

Identification

Land Use Year

Detection

Total

Average

Max

(ppb)

02335870 Residential 1993 17

0.012412

0.034

1994 7

0.008429

0.012

1995 1

0.008

0.008

1997 5

0.007756

0.0167

1998 2

0.00822

0.0122

1999 1

0.0141

0.0141

2000 4

0.005048

0.00935

2001 1

0.0039

0.0039

2002 4

0.00345

0.0042

2003 3

0.0038

0.0039

2005 3

0.006033

0.0084

02335910 Urban 1994 2

0.008

0.012

1995 1

0.005

0.005

2003 1

0.0026

0.0026

02336635 Not Applicable 2002 1

0.0057

0.0057
167

Country State Station 

Identification

Land Use Year

Detection

Total

Average

Max

(ppb)

2003 1

0.0068

0.0068

02336968 Residential 2003 1

0.0031

0.0031

COWETA GA 02344797 Not Applicable 2003 1

0.0027

0.0027

DECATUR GA 02357000 Mixed 1994 1

0.009

0.009

DEKALB GA 02203800 Mixed 1994 2

0.0145

0.019

02336040 Urban 1995 1

0.007

0.007

02336065 Urban 1995 1

0.006

0.006

02336080 Urban 1995 1

0.006

0.006

02336207 Urban 1995 1

0.004

0.004

02336212 Urban 1995 1

0.003

0.003

02336233 Urban 1995 1

0.013

0.013

DOOLY GA 02215080 Agriculture 1993 1

0.004

0.004

02215087 Agriculture 1993 1

0.018

0.018

DOUGLAS GA 02337395 Not Applicable 2003 1

0.003

0.003

FAYETTE GA 02344737 Not Applicable 2003 1

0.0031

0.0031
168

Country State Station 

Identification

Land Use Year

Detection

Total

Average

Max

(ppb)

FULTON GA 02335741 Residential 1995 2

0.006

0.008

02335760 Residential 1994 1

0.005

0.005

02335790 Residential 1995 1

0.004

0.004

02336000 Mixed 1995 1

0.005

0.005

02336123 Urban 1995 1

0.007

0.007

02336130 Urban 1994 2

0.007

0.008

02336250 Urban 1994 2

0.004

0.004

1995 1

0.004

0.004

023362775 Urban 1995 1

0.17

0.17

02336295 Urban 1995 1

0.02

0.02

02336300 Urban 1994 2

0.0125

0.015

1995 16

0.045125

0.11

1997 1

0.0269

0.0269

02336313 Urban 1995 1

0.008

0.008

02336380 Residential 1995 1

0.007

0.007
169

Country State Station 

Identification

Land Use Year

Detection

Total

Average

Max

(ppb)

02336420 Urban 1995 1

0.004

0.004

02336490 Mixed 1995 1

0.006

0.006

02336529 Urban 1994 1

0.01

0.01

02336728 Urban 1994 1

0.012

0.012

1995 1

0.002

0.002

2003 1

0.0026

0.0026

HENRY GA 02204468 Not Applicable 2003 1

0.0026

0.0026

JASPER GA 02221000 Not Applicable 2003 1

0.0029

0.0029

LEE GA 02350900 Mixed 1994 1

0.011

0.011

MILLER GA 02356980 Cropland 1994 1

0.099

0.099

MUSCOGEE GA 023415605 Urban 1994 2

0.0075

0.01

1995 1

0.007

0.007

02341564 Urban 1995 1

0.012

0.012

PIKE GA 02346358 Not Applicable 2003 1

0.0041

0.0041

PULASKI GA 02215090 Agriculture 1993 1

0.006

0.006

02215100 Agriculture 1993 4
170

Country State Station 

Identification

Land Use Year

Detection

Total

Average

Max

(ppb)

0.006

0.008

SPALDING GA 02344480 Not Applicable 2003 1

0.0033

0.0033

SUMTER GA 02350080 Cropland 2001 1

0.0037

0.0037

2003 1

0.0031

0.0031

2005 1

0.0046

0.0046

2007 3

0.005433

0.0069

TIFT GA 02317797 Agriculture 1993 1

0.021

0.021

1999 1

0.00347

0.00347

2000 2

0.005115

0.00629

TURNER GA 02317771 Agriculture 1994 1

0.009

0.009

02317778 Agriculture 1994 1

0.014

0.014

UPSON GA 02347748 Not Applicable 2003 1

0.0055

0.0055

HONOLULU HI 16213000 Mixed 1999 1

0.0109

0.0109

2000 2

0.01218

0.02

BLACK IA 05464020 Mixed 1996 1

0.009

0.009

BREMER IA 05420680 Cropland 1996 1
171

Country State Station 

Identification

Land Use Year

Detection

Total

Average

Max

(ppb)

0.011

0.011

1998 1

0.0222

0.0222

2004 1

0.0051

0.0051

2008 3

0.006533

0.008

CLINTON IA 05420500 Not Applicable 1996 3

0.039333

0.11

1997 2

0.00317

0.00376

1998 1

0.00473

0.00473

1999 2

0.00733

0.0107

2000 3

0.004187

0.00553

2002 1

0.0123

0.0123

2008 1

0.0098

0.0098

05422000 Mixed 1996 2

0.0161

0.029

DES IA 05474000 Mixed 1998 1

0.0594

0.0594

FLOYD IA 05461390 Cropland 1998 1

0.0031

0.0031

HARDIN IA 05451210 Cropland 1996 1

0.013

0.013

2005 1
172

Country State Station 

Identification

Land Use Year

Detection

Total

Average

Max

(ppb)

0.0067

0.0067

2006 1

0.0045

0.0045

2007 4

0.010825

0.02

2008 3

0.005833

0.0085

2009 4

0.00805

0.0115

IOWA IA 05453100 Mixed 1996 1

0.015

0.015

1998 1

0.0291

0.0291

JOHNSON IA 05454500 Not Applicable 2007 2

0.00535

0.0062

05455100 Cropland 1996 3

0.017

0.033

1998 2

0.0107

0.0176

LOUISA IA 05465500 Mixed 1997 2

0.02485

0.0478

1998 1

0.0261

0.0261

2002 1

0.007

0.007

2004 1

0.0062

0.0062

2005 1

0.0103

0.0103

2009 2
173

Country State Station 

Identification

Land Use Year

Detection

Total

Average

Max

(ppb)

0.00695

0.0103

TAMA IA 05464220 Cropland 1996 1

0.007

0.007

1997 2

0.002925

0.00378

1998 1

0.0666

0.0666

WASHINGTON IA 05455570 Cropland 1996 2

0.0175

0.028

1997 2

0.004905

0.00581

WRIGHT IA 05449500 Cropland 1997 1

0.00217

0.00217

2004 1

0.0037

0.0037

BEAR ID 10068500 Rangeland 2001 1

0.00441

0.00441

ELMORE ID 13154500 Mixed 2005 1

0.0038

0.0038

2007 1

0.0031

0.0031

TWIN ID 13092713 Agriculture 1994 1

0.19

0.19

13092715 Agriculture 1994 1

0.011

0.011

13092747 Agriculture 1994 2

0.008

0.01

1997 1

0.00578

0.00578

2000 2
174

Country State Station 

Identification

Land Use Year

Detection

Total

Average

Max

(ppb)

0.00225

0.00306

2004 1

0.0062

0.0062

2005 2

0.00335

0.0034

2008 3

0.004367

0.0054

ALEXANDER IL 07022000 Not Applicable 1996 5

0.021

0.05

1997 4

0.003468

0.0059

1999 1

0.0158

0.0158

COOK IL 05531500 Urban 2000 1

0.00686

0.00686

2002 1

0.0126

0.0126

2007 7

0.006471

0.0119

05532500 Mixed 2003 1

0.0049

0.0049

IROQUOIS IL 05525500 Cropland 1999 5

0.0243

0.0515

2000 4

0.009563

0.0134

2001 2

0.0087

0.0149

2002 1

0.0369

0.0369

2003 1
175

Country State Station 

Identification

Land Use Year

Detection

Total

Average

Max

(ppb)

0.0066

0.0066

JERSEY IL 05587455 Not Applicable 1997 1

0.00365

0.00365

LA IL 05543500 Mixed 1996 4

0.0145

0.031

1997 1

0.0155

0.0155

05552500 Mixed 1996 5

0.01608

0.059

05553500 Mixed 1997 5

0.005586

0.00969

1998 3

0.013503

0.0303

1999 1

0.0185

0.0185

2000 1

0.0037

0.0037

2001 1

0.0025

0.0025

2003 1

0.0099

0.0099

MCDONOUGH IL 05584500 Cropland 1997 5

0.06316

0.117

1998 1

0.00382

0.00382

PIATT IL 05572000 Cropland 1997 19

0.035539

0.131

1998 1

0.00223

0.00223

2003 1
176

Country State Station 

Identification

Land Use Year

Detection

Total

Average

Max

(ppb)

0.0433

0.0433

2004 1

0.0075

0.0075

2008 3

0.004733

0.0054

PULASKI IL 03612500 Not Applicable 1996 10

0.00758

0.0233

1997 6

0.005767

0.0138

1998 3

0.01111

0.025

1999 3

0.004883

0.00682

2000 7

0.005509

0.00909

2001 2

0.00227

0.00334

SCOTT IL 05586100 Mixed 1996 4

0.01195

0.017

1997 2

0.00398

0.004

1999 1

0.0318

0.0318

2001 1

0.0025

0.0025

2002 1

0.0046

0.0046

2003 2

0.0064

0.007

2006 2
177

Country State Station 

Identification

Land Use Year

Detection

Total

Average

Max

(ppb)

0.0047

0.0048

2008 1

0.0057

0.0057

STARK IL 05568800 Cropland 1996 1

0.0037

0.0037

1998 1

0.0269

0.0269

WOODFORD IL 05567000 Cropland 1997 1

0.0039

0.0039

ALLEN IN 04183000 Cropland 1996 4

0.0317

0.0919

1997 4

0.0211

0.045

BARTHOLOMEW IN 391732085414401 Cropland 1994 2

0.0095

0.014

DAVIESS IN 385234087071801 Mixed 1995 2

0.0055

0.006

GIBSON IN 03374100 Mixed 1992 7

0.007714

0.015

1993 11

0.020273

0.13

1995 10

0.0289

0.069

1996 6

0.085167

0.13

1997 1

0.00822

0.00822

2000 3

0.006637

0.0138

2003 2
178

Country State Station 

Identification

Land Use Year

Detection

Total

Average

Max

(ppb)

0.00315

0.0039

2005 1

0.0046

0.0046

HAMILTON IN 395743086030501 Not Applicable 2003 3

0.006767

0.0081

2005 2

0.00375

0.004

HANCOCK IN 394340085524601 Cropland 1992 5

0.0102

0.023

1993 8

0.00875

0.021

1996 2

0.044

0.073

2003 4

0.004375

0.0068

2004 8

0.01095

0.021

2006 1

0.005

0.005

2008 2

0.00625

0.0077

JEFFERSON IN 03366500 Cropland 1994 1

0.014

0.014

MARION IN 03353637 Urban 1992 43

0.01314

0.067

1993 24

0.017958

0.08

1994 5

0.0136

0.025

1995 6
179

Country State Station 

Identification

Land Use Year

Detection

Total

Average

Max

(ppb)

0.0115

0.026

1996 6

0.029833

0.11

1997 5

0.005486

0.0102

1998 2

0.00529

0.00672

2000 2

0.00918

0.0117

2001 3

0.0309

0.0704

2002 1

0.0065

0.0065

MORGAN IN 03354000 Mixed 1994 9

0.018

0.026

1995 2

0.012

0.012

ORANGE IN 03373530 Cropland 1995 1

0.006

0.006

PERRY IN 03303280 Not Applicable 1996 6

0.0055

0.0085

1997 3

0.007827

0.0112

1998 4

0.005758

0.0122

2000 2

0.010825

0.018

POSEY IN 03378500 Not Applicable 1997 2

0.023865

0.0405

1998 3
180

Country State Station 

Identification

Land Use Year

Detection

Total

Average

Max

(ppb)

0.023047

0.0608

1999 5

0.009238

0.0154

2000 6

0.0062

0.0128

2001 1

0.004

0.004

2002 2

0.0034

0.0036

2003 1

0.0053

0.0053

2004 2

0.005

0.0053

2008 1

0.0064

0.0064

PUTNAM IN 03357330 Not Applicable 2002 2

0.0244

0.0451

393306086585201 Cropland 1994 2

0.01

0.011

1995 1

0.008

0.008

GREENUP KY 03216600 Not Applicable 1997 3

0.00495

0.00602

1998 4

0.003295

0.0049

1999 1

0.00342

0.00342

2000 2

0.002415

0.00275

MCCRACKEN KY 03609750 Not Applicable 1997 2
181

Country State Station 

Identification

Land Use Year

Detection

Total

Average

Max

(ppb)

0.003565

0.0046

1998 2

0.00504

0.00702

1999 2

0.00395

0.00516

2000 7

0.005299

0.00948

2008 1

0.0053

0.0053

ACADIA LA 08011020 Cropland 2000 1

0.00273

0.00273

301959092323400 Cropland 2000 1

0.0106

0.0106

302403092152300 Cropland 2000 1

0.00186

0.00186

302749092203500 Cropland 2000 1

0.00289

0.00289

ASSUMPTION LA 073814675 Mixed 2000 1

0.00279

0.00279

EAST LA 07379960 Urban 1998 3

0.008673

0.0103

1999 14

0.010796

0.028

2000 23

0.008965

0.0218

2001 1

0.0033

0.0033

2002 2

0.00675

0.0088

2003 2
182

Country State Station 

Identification

Land Use Year

Detection

Total

Average

Max

(ppb)

0.00655

0.0088

IBERVILLE LA 07381440 Cropland 1998 1

0.00362

0.00362

2000 3

0.016927

0.036

JEFFERSON LA 08012150 Mixed 1999 1

0.013

0.013

2000 1

0.0157

0.0157

2004 1

0.0064

0.0064

2005 1

0.0069

0.0069

2006 1

0.0108

0.0108

2007 7

0.005386

0.0079

LAFOURCHE LA 07381002 Cropland 1999 2

0.00239

0.00328

MADISON LA 07369500 Cropland 1996 6

0.016667

0.023

1997 6

0.023

0.052

POINTE LA 07381495 Not Applicable 1996 2

0.008

0.008

1997 3

0.007267

0.0104

1998 1

0.0077

0.0077

2004 1
183

Country State Station 

Identification

Land Use Year

Detection

Total

Average

Max

(ppb)

0.0041

0.0041

ST. LA 08010000 Cropland 1999 2

0.00942

0.0131

2000 5

0.010332

0.0163

2001 1

0.0081

0.0081

ST. LA 07381600 Not Applicable 2008 1

0.0059

0.0059

WEST LA 07373420 Not Applicable 1997 2

0.011165

0.0176

MIDDLESEX MA 01102500 Urban 1999 3

0.007637

0.00958

NORFOLK MA 01105000 Urban 2000 1

0.00324

0.00324

PLYMOUTH MA 01106468 Urban 2000 2

0.00373

0.00458

FREDERICK MD 01639000 Agriculture 1994 1

0.03

0.03

1995 4

0.0125

0.031

1996 3

0.005333

0.007

01643020 Mixed 1996 3

0.005333

0.006

HARFORD MD 01578310 Mixed 1996 1

0.004

0.004

1997 1

0.00225

0.00225

2000 1
184

Country State Station 

Identification

Land Use Year

Detection

Total

Average

Max

(ppb)

0.00157

0.00157

2001 1

0.0012

0.0012

2009 1

0.0059

0.0059

2010 1

0.0948

0.0948

KENT MD 01493112 Agriculture 1999 9

0.004258

0.00698

2000 3

0.006587

0.0135

2002 1

0.0027

0.0027

MONTGOMERY MD 01646350 Urban 1994 1

0.009

0.009

01650900 Urban 1994 1

0.019

0.019

WASHINGTON MD 01614500 Mixed 1996 2

0.0125

0.014

01619200 Urban 1993 1

0.01

0.01

MACOMB MI 04161820 Urban 1996 3

0.006533

0.0106

1997 4

0.006398

0.0113

2001 1

0.0028

0.0028

ST MI 04159492 Cropland 1996 2

0.01145

0.0178

ANOKA MN 05288475 Urban 1997 1
185

Country State Station 

Identification

Land Use Year

Detection

Total

Average

Max

(ppb)

0.00416

0.00416

05288650 Not Applicable 2005 2

0.00625

0.0071

BLUE MN 05320270 Agriculture 2003 1

0.0066

0.0066

2005 2

0.0125

0.0217

2006 6

0.009433

0.021

2007 6

0.006983

0.0159

DAKOTA MN 05331580 Mixed 1998 1

0.00377

0.00377

2000 1

0.00163

0.00163

2001 1

0.0062

0.0062

2009 1

0.0078

0.0078

HENNEPIN MN 05288705 Urban 1997 2

0.0083

0.00844

MARSHALL MN 05085900 Cropland 1993 2

0.0185

0.031

1994 1

0.02

0.02

MONTGOMERY MO 06934500 Not Applicable 1996 3

0.038667

0.046

2002 1

0.0052

0.0052

POLK MO 06921070 Pasture 1995 1
186

Country State Station 

Identification

Land Use Year

Detection

Total

Average

Max

(ppb)

0.009

0.009

STODDARD MO 07043500 Cropland 1996 1

0.01

0.01

1997 2

0.004185

0.00447

WRIGHT MO 06927590 Pasture 1995 1

0.007

0.007

WARREN MS 07288955 Mixed 1996 4

0.01725

0.035

1997 2

0.0085

0.009

2005 1

0.0037

0.0037

2006 2

0.0054

0.0062

2007 1

0.0062

0.0062

2009 2

0.00745

0.0079

WASHINGTON MS 07288650 Cropland 1996 2

0.039

0.072

2004 1

0.0069

0.0069

2006 1

0.0044

0.0044

2007 2

0.00515

0.0055

RICHLAND MT 06329500 Mixed 1998 2

0.00278

0.00288

2000 3
187

Country State Station 

Identification

Land Use Year

Detection

Total

Average

Max

(ppb)

0.001853

0.00202

ROSEBUD MT 06295000 Mixed 1999 1

0.00177

0.00177

2009 1

0.0048

0.0048

ALAMANCE NC 0209679804 Not Applicable 2003 1

0.0085

0.0085

BUNCOMBE NC 0344776625 Mixed 1997 1

0.00416

0.00416

0344878100 Urban 1997 1

0.00597

0.00597

03451500 Mixed 1997 1

0.00474

0.00474

BURKE NC 02143040 Forest 1996 1

0.007

0.007

EDGECOMBE NC 02083500 Mixed 1993 1

0.007

0.007

FRANKLIN NC 02082731 Agriculture 1993 1

0.01

0.01

GASTON NC 02145112 Mixed 1996 1

0.006

0.006

GATES NC 02053580 Agriculture 1994 1

0.058

0.058

GREENE NC 02091000 Agriculture 1995 1

0.006

0.006

02091500 Mixed 1995 1

0.005

0.005

1997 2

0.004375

0.00545

1998 6
188

Country State Station 

Identification

Land Use Year

Detection

Total

Average

Max

(ppb)

0.005872

0.00805

1999 1

0.0049

0.0049

2000 2

0.002655

0.00314

2001 1

0.0027

0.0027

2003 3

0.011567

0.0214

2004 1

0.006

0.006

2005 1

0.0038

0.0038

2008 4

0.007325

0.0086

0209171600 Agriculture 1995 1

0.007

0.007

0209173200 Agriculture 1995 1

0.007

0.007

HENDERSON NC 0344602100 Forest 1997 1

0.00587

0.00587

0344700000 Urban 1997 1

0.00478

0.00478

0344766600 Agriculture 1997 1

0.0059

0.0059

JOHNSTON NC 0208755215 Not Applicable 2005 1

0.0037

0.0037

LENOIR NC 0208925200 Agriculture 1995 1

0.013

0.013

02089500 Mixed 1997 2
189

Country State Station 

Identification

Land Use Year

Detection

Total

Average

Max

(ppb)

0.003635

0.00427

1998 2

0.0033

0.00358

2003 1

0.0036

0.0036

MADISON NC 0345292005 Agriculture 1997 1

0.00382

0.00382

03453500 Mixed 1997 1

0.00546

0.00546

MARTIN NC 0208104942 Agriculture 1994 1

0.008

0.008

PITT NC 02083833 Agriculture 1993 3

0.009333

0.01

02084160 Agriculture 1992 12

0.00475

0.008

1995 1

0.01

0.01

0209160450 Mixed 1995 1

0.009

0.009

02091700 Mixed 1995 1

0.01

0.01

TRANSYLVANIA NC 03439000 Reference 1997 1

0.00347

0.00347

WAKE NC 0208726370 Not Applicable 2003 1

0.0025

0.0025

0208726995 Not Applicable 2003 1

0.0022

0.0022

0208732610 Not Applicable 2003 1

0.004

0.004

02087580 Urban 2002 1
190

Country State Station 

Identification

Land Use Year

Detection

Total

Average

Max

(ppb)

0.0069

0.0069

2003 2

0.00655

0.0079

2007 1

0.0051

0.0051

WILSON NC 0209051600 Agriculture 1994 1

0.034

0.034

1995 1

0.042

0.042

02090519 Mixed 1994 2

0.0075

0.01

1995 1

0.014

0.014

CASS ND 05053800 Mixed 1995 1

0.004

0.004

GRAND ND 05082625 Cropland 2000 1

0.00257

0.00257

05083100 Cropland 1994 1

0.018

0.018

PEMBINA ND 05102490 Mixed 1994 2

0.0045

0.006

1996 2

0.01935

0.034

1998 1

0.0074

0.0074

1999 2

0.005105

0.00676

COLFAX NE 06799750 Not Applicable 2004 2

0.0071

0.0099

DODGE NE 06800000 Agriculture 1992 16
191

Country State Station 

Identification

Land Use Year

Detection

Total

Average

Max

(ppb)

0.029313

0.13

1993 4

0.03825

0.122

1997 2

0.023995

0.0416

1998 3

0.035537

0.0843

1999 3

0.008097

0.0113

2000 1

0.00404

0.00404

2002 6

0.005633

0.0091

2003 10

0.00735

0.0237

2004 12

0.010775

0.029

2005 1

0.0031

0.0031

2008 10

0.01376

0.0431

DOUGLAS NE 06610000 Not Applicable 1996 1

0.016

0.016

2001 1

0.0066

0.0066

2002 2

0.00455

0.0054

2003 1

0.0077

0.0077

2004 2
192

Country State Station 

Identification

Land Use Year

Detection

Total

Average

Max

(ppb)

0.0082

0.012

06800500 Mixed 1993 2

0.0915

0.109

2002 1

0.0119

0.0119

2003 2

0.02745

0.0363

2004 1

0.0061

0.0061

2007 5

0.00472

0.0054

HALL NE 06773050 Cropland 1993 4

0.0595

0.107

PLATTE NE 06795500 Agriculture 1993 8

0.029375

0.071

2009 11

0.008955

0.0287

SARPY NE 06805500 Mixed 1992 13

0.031154

0.11

1993 3

0.039667

0.072

1997 3

0.005143

0.00903

1998 1

0.0473

0.0473

1999 2

0.0342

0.0586

2000 1

0.0149

0.0149

2002 1
193

Country State Station 

Identification

Land Use Year

Detection

Total

Average

Max

(ppb)

0.001

0.001

2003 2

0.00485

0.0069

2004 1

0.0045

0.0045

2007 1

0.004

0.004

2008 3

0.0104

0.0224

2009 1

0.0076

0.0076

HILLSBOROUGH NH 01094161 Urban 2000 1

0.00143

0.00143

BERGEN NJ 01390450 Other/Mixed 1997 1

0.0023

0.0023

01390500 Residential 1996 7

0.015571

0.064

01390815 Residential 1997 1

0.0048

0.0048

01391500 Commercial/Indust

rial

1997 1

0.0047

0.0047

BURLINGTON NJ 01467000 Reference 2000 1

0.00483

0.00483

CAMDEN NJ 01410784 Urban 1996 1

0.013

0.013

01467150 Residential 1999 7

0.006413

0.0164

2000 5

0.00572

0.00838

2001 2
194

Country State Station 

Identification

Land Use Year

Detection

Total

Average

Max

(ppb)

0.0034

0.0039

CUMBERLAND NJ 01411790 Residential 1997 1

0.0043

0.0043

ESSEX NJ 01382000 Mixed 1996 3

0.0082

0.009

1997 1

0.0046

0.0046

1999 1

0.00695

0.00695

GLOUCESTER NJ 01475000 Urban 1997 1

0.0052

0.0052

01477120 Cropland 1999 3

0.007487

0.00898

2001 1

0.004

0.004

MERCER NJ 01401000 Residential 1996 2

0.0045

0.005

01463500 Mixed 2000 1

0.00231

0.00231

2001 1

0.0023

0.0023

2006 1

0.0053

0.0053

01463810 Urban 2000 2

0.00255

0.00288

01464500 Agriculture 1999 1

0.00242

0.00242

MORRIS NJ 01381295 Commercial/Indust

rial

1997 1

0.001

0.001

01381800 Commercial/Indust 1997 1
195

Country State Station 

Identification

Land Use Year

Detection

Total

Average

Max

(ppb)

rial

0.0036

0.0036

OCEAN NJ 01408500 Forest 1997 1

0.0067

0.0067

01408600 Residential 1998 1

0.0124

0.0124

01408728 Urban 1998 1

0.0102

0.0102

SOMERSET NJ 01403300 Mixed 1996 3

0.0161

0.035

1997 1

0.0089

0.0089

1998 1

0.00365

0.00365

1999 1

0.00584

0.00584

2001 1

0.0041

0.0041

01403900 Urban 1996 16

0.017906

0.044

1997 8

0.011738

0.0216

1998 2

0.0063

0.00776

2001 2

0.0057

0.008

2004 1

0.0114

0.0114

2007 1

0.0079

0.0079
196

Country State Station 

Identification

Land Use Year

Detection

Total

Average

Max

(ppb)

SUSSEX NJ 01367770 Forest 1997 1

0.0016

0.0016

UNION NJ 01393400 Residential 1997 1

0.0071

0.0071

01394500 Forest 1997 1

0.0063

0.0063

VALENCIA NM 08331000 Mixed 1994 1

0.006

0.006

1995 2

0.006

0.006

1996 2

0.00775

0.008

CLARK NV 094196783 Urban 1993 3

0.011333

0.015

1994 4

0.0235

0.047

1995 11

0.073091

0.16

1997 4

0.01445

0.0208

1998 11

0.007744

0.0166

1999 1

0.0023

0.0023

2000 6

0.108172

0.57

2001 4

0.002903

0.00382

2007 1

0.0055

0.0055
197

Country State Station 

Identification

Land Use Year

Detection

Total

Average

Max

(ppb)

09419790 Mixed 1994 4

0.0145

0.025

STOREY NV 10350500 Mixed 1998 1

0.00682

0.00682

2000 1

0.00295

0.00295

2002 1

0.005

0.005

2005 1

0.0062

0.0062

WASHOE NV 10349995 Mixed 1994 3

0.016

0.021

MONTGOMERY NY 01349150 Agriculture 2000 1

0.0235

0.0235

SCHENECTADY NY 01356190 Residential 1994 1

0.009

0.009

2005 1

0.0054

0.0054

ULSTER NY 01371500 Mixed 1994 1

0.01

0.01

1996 2

0.0205

0.024

ASHTABULA OH 04211820 Pasture 1996 1

0.0046

0.0046

1997 4

0.034465

0.106

BUTLER OH 03274000 Mixed 1999 2

0.0316

0.0403

2000 1

0.00324

0.00324
198

Country State Station 

Identification

Land Use Year

Detection

Total

Average

Max

(ppb)

2001 1

0.002

0.002

CLARK OH 03267900 Cropland 2000 1

0.00593

0.00593

2004 1

0.0074

0.0074

CLERMONT OH 03246400 Cropland 2000 2

0.00388

0.00426

CUYAHOGA OH 04208504 Mixed 1996 6

0.016167

0.025

1997 7

0.010883

0.0225

DARKE OH 400834084445500 Agriculture 2000 1

0.0469

0.0469

401208084325700 Agriculture 2000 1

0.00832

0.00832

401404084381200 Agriculture 2000 1

0.00958

0.00958

401612084280200 Agriculture 2000 1

0.029

0.029

DEFIANCE OH 04178000 Cropland 1996 3

0.077333

0.211

1997 5

0.010536

0.0195

1998 1

0.00702

0.00702

2003 1

0.0055

0.0055

2004 1

0.034

0.034
199

Country State Station 

Identification

Land Use Year

Detection

Total

Average

Max

(ppb)

GREENE OH 393903083582900 Urban 2001 1

0.0049

0.0049

394727083523000 Urban 2001 1

0.0051

0.0051

LUCAS OH 04193500 Mixed 1996 9

0.014344

0.0299

1997 5

0.00921

0.0248

2000 2

0.00697

0.0102

2001 2

0.00335

0.0037

2002 1

0.003

0.003

2003 1

0.0108

0.0108

2004 1

0.019

0.019

2005 1

0.005

0.005

2006 6

0.004917

0.006

2007 6

0.00631

0.0113

MIAMI OH 395611084180600 Mixed 2000 2

0.02351

0.0422

395929084210500 Agriculture 2000 1

0.0198

0.0198

400039084250900 Agriculture 2000 1

0.011

0.011
200

Country State Station 

Identification

Land Use Year

Detection

Total

Average

Max

(ppb)

400906084255300 Agriculture 2000 1

0.0069

0.0069

400937084240400 Agriculture 2000 1

0.0251

0.0251

MONTGOMERY OH 393944084120700 Urban 1999 7

0.014169

0.0571

2000 9

0.008207

0.0121

2001 3

0.004233

0.0047

2002 1

0.0062

0.0062

2003 1

0.0109

0.0109

394111084234200 Urban 2001 1

0.005

0.005

395355084173600 Agriculture 2000 1

0.00566

0.00566

PUTNAM OH 04186500 Cropland 1996 2

0.02815

0.051

1997 6

0.012413

0.024

1998 1

0.0192

0.0192

2001 1

0.0119

0.0119

2003 1

0.0124

0.0124

2004 1

0.0077

0.0077
201

Country State Station 

Identification

Land Use Year

Detection

Total

Average

Max

(ppb)

2005 2

0.00615

0.008

2008 1

0.0037

0.0037

WARREN OH 392219084172100 Urban 2001 1

0.0063

0.0063

BENTON OR 442223123153703 Agriculture 1994 1

0.009

0.009

CLACKAMAS OR 14202000 Agriculture 1993 3

0.007333

0.008

1994 4

0.01125

0.032

1995 3

0.012333

0.017

1996 2

0.0099

0.0115

14207500 Mixed 1994 1

0.007

0.007

14211550 Urban 1993 1

0.01

0.01

452337122243500 Not Applicable 2004 4

0.01265

0.022

452414122213200 Not Applicable 2004 4

0.002975

0.0046

COLUMBIA OR 14246900 Not Applicable 1996 2

0.00355

0.0048

1997 2

0.0045

0.005

1998 3

0.00356

0.004
202

Country State Station 

Identification

Land Use Year

Detection

Total

Average

Max

(ppb)

2000 1

0.00348

0.00348

2003 1

0.0128

0.0128

2004 1

0.0056

0.0056

2007 2

0.0054

0.0056

2008 2

0.0058

0.0067

2009 1

0.005

0.005

2010 2

0.00405

0.0061

MARION OR 14201300 Agriculture 1993 9

0.020111

0.038

1994 8

0.014625

0.033

1995 3

0.147333

0.401

1996 2

0.00455

0.0054

1997 7

0.012646

0.0285

1998 5

0.014734

0.0312

1999 5

0.04326

0.109

2000 9

0.017223

0.0804
203

Country State Station 

Identification

Land Use Year

Detection

Total

Average

Max

(ppb)

2001 15

0.010193

0.0461

2002 24

0.011142

0.0344

2003 11

0.009555

0.056

2004 8

0.018463

0.0496

2005 6

0.050483

0.209

2006 4

0.0539

0.172

2007 5

0.0124

0.0145

2008 16

0.017906

0.121

445551123015800 Not Applicable 2004 2

0.00355

0.0037

450022123012400 Not Applicable 2003 1

0.0019

0.0019

2004 2

0.0037

0.0044

450343122443203 Agriculture 1994 1

0.005

0.005

450417122461603 Agriculture 1994 1

0.004

0.004

450431122454602 Agriculture 1994 1

0.025

0.025

450517122471503 Agriculture 1994 1

0.008

0.008
204

Country State Station 

Identification

Land Use Year

Detection

Total

Average

Max

(ppb)

MULTNOMAH OR 14128910 Not Applicable 1997 2

0.005

0.005

1998 1

0.0036

0.0036

2000 1

0.00602

0.00602

14211720 Mixed 1994 1

0.0059

0.0059

1995 1

0.0049

0.0049

1996 5

0.00756

0.0131

1997 12

0.005445

0.0135

1998 7

0.003786

0.00705

1999 4

0.002645

0.00365

2000 6

0.005388

0.0075

2002 1

0.0067

0.0067

2003 2

0.0065

0.0109

2005 3

0.006833

0.0098

2006 4

0.0063

0.009

2007 9

0.006656

0.0137
205

Country State Station 

Identification

Land Use Year

Detection

Total

Average

Max

(ppb)

2008 4

0.006425

0.0099

2009 1

0.0063

0.0063

WASHINGTON OR 14206950 Urban 1993 8

0.027375

0.046

1994 9

0.012022

0.022

1995 4

0.0174

0.0398

2001 7

0.003733

0.0063

2002 6

0.0068

0.0124

2003 1

0.0054

0.0054

2005 2

0.00525

0.0053

2006 2

0.00805

0.0091

2007 1

0.0046

0.0046

2009 1

0.0066

0.0066

ALLEGHENY PA 03049646 Urban 1996 1

0.004

0.004

1997 1

0.00264

0.00264

BERKS PA 01470744 Agriculture 2000 1

0.00895

0.00895
206

Country State Station 

Identification

Land Use Year

Detection

Total

Average

Max

(ppb)

01470779 Cropland 2000 3

0.00556

0.00729

01470818 Agriculture 2000 1

0.00344

0.00344

01471520 Urban 2000 1

0.00248

0.00248

BLAIR PA 402836078103601 Agriculture 1994 1

0.008

0.008

BUCKS PA 01462949 Urban 2000 1

0.0014

0.0014

01464907 Residential 1999 2

0.029405

0.0508

2000 1

0.00487

0.00487

2001 1

0.0037

0.0037

CHESTER PA 01472157 Cropland 2000 2

0.002425

0.00258

2004 1

0.0173

0.0173

01478200 Urban 2000 1

0.0213

0.0213

01480350 Urban 2000 1

0.0242

0.0242

01480775 Urban 2000 1

0.00781

0.00781

01480890 Urban 2000 1

0.00192

0.00192

CUMBERLAND PA 01571490 Urban 1993 3

0.019333

0.024
207

Country State Station 

Identification

Land Use Year

Detection

Total

Average

Max

(ppb)

1994 2

0.0145

0.019

1995 12

0.013167

0.047

401303076562001 Mixed 1994 1

0.009

0.009

401334076551001 Mixed 1994 1

0.009

0.009

DAUPHIN PA 01571000 Urban 1994 1

0.004

0.004

DELAWARE PA 01475510 Urban 2000 1

0.00161

0.00161

01475543 Urban 2000 2

0.0026

0.00334

INDIANA PA 03037525 Agriculture 1996 1

0.009

0.009

1997 3

0.005463

0.00959

LANCASTER PA 01576540 Agriculture 1993 4

0.00825

0.01

1994 4

0.014

0.024

LEBANON PA 01573095 Agriculture 1995 15

0.0132

0.09

401632076290701 Mixed 1995 1

0.024

0.024

401704076293101 Mixed 1995 1

0.004

0.004

401809076301901 Mixed 1995 1

0.007

0.007
208

Country State Station 

Identification

Land Use Year

Detection

Total

Average

Max

(ppb)

LEHIGH PA 01451425 Agriculture 2000 1

0.00599

0.00599

01451624 Urban 2000 1

0.00634

0.00634

MONTGOMERY PA 01467040 Urban 2000 1

0.0153

0.0153

01473470 Urban 2000 1

0.00208

0.00208

NORTHAMPTON PA 01454700 Mixed 2000 2

0.003625

0.00505

NORTHUMBERLAND PA 01555500 Mixed 1995 1

0.041

0.041

PERRY PA 01567000 Mixed 1995 1

0.017

0.017

PHILADELPHIA PA 01474000 Urban 1999 1

0.0047

0.0047

01474500 Mixed 2000 6

0.003617

0.0049

2001 1

0.0013

0.0013

2002 1

0.0049

0.0049

PIKE PA 01434000 Mixed 2000 1

0.00272

0.00272

SCHUYLKILL PA 01555400 Agriculture 1993 9

0.014444

0.038

1994 1

0.013

0.013

1995 1

0.015

0.015
209

Country State Station 

Identification

Land Use Year

Detection

Total

Average

Max

(ppb)

1998 1

0.0116

0.0116

2000 7

0.004844

0.0104

SNYDER PA 01555000 Mixed 1995 1

0.023

0.023

GREENVILLE SC 021603257 Urban 1996 3

0.007533

0.0156

ORANGEBURG SC 02174250 Cropland 1996 31

0.012929

0.057

1998 1

0.0152

0.0152

1999 10

0.024763

0.0843

2000 10

0.006876

0.0177

2001 7

0.00754

0.0177

2002 2

0.0178

0.0179

2003 2

0.00825

0.01

2004 2

0.0095

0.0115

2005 6

0.0621

0.338

2006 10

0.00566

0.0082

2007 1

0.005

0.005
210

Country State Station 

Identification

Land Use Year

Detection

Total

Average

Max

(ppb)

2008 9

0.008078

0.0122

RICHLAND SC 021695601 Urban 1996 1

0.0018

0.0018

021695610 Urban 1996 1

0.0091

0.0091

021695614 Urban 1996 1

0.0076

0.0076

021695617 Urban 1996 1

0.0032

0.0032

021695626 Urban 1996 1

0.0063

0.0063

021695639 Urban 1996 1

0.0051

0.0051

021695658 Urban 1996 1

0.0098

0.0098

021695666 Urban 1996 1

0.0142

0.0142

021695684 Urban 1996 1

0.0318

0.0318

02169570 Urban 1996 29

0.014276

0.095

1997 2

0.00605

0.0063

2001 2

0.00302

0.00414

2003 1

0.0048

0.0048

2005 1

0.0078

0.0078
211

Country State Station 

Identification

Land Use Year

Detection

Total

Average

Max

(ppb)

HUGHES SD 06440000 Not Applicable 1998 1

0.00344

0.00344

YANKTON SD 06467500 Not Applicable 2003 1

0.0036

0.0036

CLAIBORNE TN 03528000 Mixed 1997 1

0.0034

0.0034

COCKE TN 03455000 Mixed 1996 2

0.00315

0.0043

1997 3

0.007033

0.0111

03461080 Forest 1996 1

0.005

0.005

03467609 Mixed 1996 3

0.006433

0.014

GILES TN 03584600 Mixed 2000 1

0.00845

0.00845

GREENE TN 03466208 Agriculture 1996 12

0.007983

0.033

1997 1

0.0041

0.0041

2000 1

0.00989

0.00989

03466835 Agriculture 1997 1

0.00779

0.00779

HAWKINS TN 03490500 Mixed 1997 2

0.00445

0.0049

ROANE TN 03541498 Forest 1996 1

0.012

0.012

SHELBY TN 07031692 Urban 1996 4

0.032625

0.0673
212

Country State Station 

Identification

Land Use Year

Detection

Total

Average

Max

(ppb)

1997 22

0.060141

0.251

2002 3

0.011133

0.0171

2003 2

0.0101

0.0118

2004 2

0.01255

0.0151

WASHINGTON TN 03465500 Mixed 1996 2

0.0052

0.006

1997 1

0.0119

0.0119

BEXAR TX 08178800 Urban 1997 10

0.006404

0.0103

1998 2

0.003475

0.00424

2005 2

0.00605

0.0066

08181800 Mixed 1997 9

0.005604

0.0094

1998 2

0.00488

0.00516

2001 1

0.00432

0.00432

CAMERON TX 08470400 Not Applicable 1996 9

0.069078

0.22

1997 9

0.025999

0.11

2001 1

0.0233

0.0233
213

Country State Station 

Identification

Land Use Year

Detection

Total

Average

Max

(ppb)

2002 1

0.0145

0.0145

2003 2

0.0084

0.0133

2005 2

0.0176

0.022

2006 2

0.01755

0.0182

2007 3

0.007633

0.0122

08475000 Not Applicable 1996 2

0.0145

0.026

1997 1

0.00928

0.00928

1998 1

0.00881

0.00881

2002 1

0.007

0.007

2003 3

0.005333

0.0061

2004 4

0.006625

0.0079

2005 1

0.0076

0.0076

2006 6

0.01175

0.0174

2007 6

0.00805

0.0164

2008 5

0.00626

0.0082
214

Country State Station 

Identification

Land Use Year

Detection

Total

Average

Max

(ppb)

2009 4

0.013325

0.0353

COLLIN TX 08058900 Agriculture 1994 1

0.01

0.01

COOKE TX 08050800 Reference 1993 1

0.007

0.007

DALLAS TX 08050100 Urban 1994 1

0.015

0.015

08055500 Not Applicable 2003 1

0.0033

0.0033

08057200 Urban 1995 7

0.013714

0.024

1997 8

0.010628

0.0204

1998 12

0.008939

0.0278

1999 8

0.007303

0.0171

2000 12

0.012018

0.0549

2001 4

0.003038

0.0044

2002 7

0.007014

0.0198

2003 3

0.004867

0.0053

2004 2

0.0074

0.0081

2005 1

0.008

0.008
215

Country State Station 

Identification

Land Use Year

Detection

Total

Average

Max

(ppb)

2007 3

0.0087

0.0114

08057410 Mixed 1994 1

0.022

0.022

1995 3

0.011333

0.015

1997 3

0.009623

0.0114

1998 2

0.004575

0.00595

1999 4

0.006248

0.0114

2005 1

0.0042

0.0042

2008 2

0.0065

0.0066

08057448 Mixed 1999 1

0.00479

0.00479

2000 3

0.004493

0.00744

DENTON TX 08051500 Reference 1994 1

0.014

0.014

1997 1

0.00317

0.00317

2002 1

0.0029

0.0029

EL TX 08364000 Mixed 1994 1

0.008

0.008

1995 3

0.005333

0.008
216

Country State Station 

Identification

Land Use Year

Detection

Total

Average

Max

(ppb)

1996 5

0.00904

0.029

1997 5

0.007072

0.02

1999 2

0.00774

0.014

2000 4

0.013945

0.0469

2001 4

0.02423

0.0866

2002 1

0.005

0.005

2003 4

0.005875

0.0087

2004 2

0.0087

0.0092

2005 6

0.008817

0.0164

2006 11

0.006882

0.0156

2007 4

0.007675

0.0102

FORT TX 08116650 Not Applicable 2008 1

0.0075

0.0075

FREESTONE TX 08064700 Agriculture 1994 1

0.009

0.009

HOUSTON TX 08065350 Mixed 1994 2

0.0065

0.009

KAUFMAN TX 08062000 Urban 1994 1

0.017

0.017

08062900 Agriculture 1994 2
217

Country State Station 

Identification

Land Use Year

Detection

Total

Average

Max

(ppb)

0.0325

0.048

KENDALL TX 08167000 Mixed 1997 1

0.00187

0.00187

LIBERTY TX 08067190 Agriculture 1994 1

0.006

0.006

MEDINA TX 08180640 Agriculture 1997 7

0.005209

0.00746

NAVARRO TX 08064100 Agriculture 1995 1

0.008

0.008

2004 1

0.0086

0.0086

2006 1

0.0062

0.0062

PRESIDIO TX 08374200 Not Applicable 1999 1

0.00347

0.00347

2003 1

0.0029

0.0029

2007 1

0.0089

0.0089

STARR TX 08461300 Not Applicable 1996 3

0.013567

0.029

1997 1

0.0612

0.0612

TARRANT TX 08047000 Reference 1994 1

0.015

0.015

WALKER TX 08065800 Agriculture 1994 1

0.004

0.004

WEBB TX 08459200 Not Applicable 1999 1

0.0172

0.0172

2001 1

0.0027
218

Country State Station 

Identification

Land Use Year

Detection

Total

Average

Max

(ppb)

0.0027

2002 2

0.00655

0.0068

2003 3

0.005333

0.0068

2004 3

0.007467

0.0119

CACHE UT 10102200 Agriculture 2000 1

0.00273

0.00273

DAVIS UT 410041111581101 Residential 2000 1

0.00189

0.00189

410342111574201 Residential 2000 2

0.008795

0.0156

410453111570001 Residential 2000 1

0.00183

0.00183

410501111555201 Residential 2000 1

0.00387

0.00387

GRAND UT 09180500 Not Applicable 1997 2

0.003325

0.004

SALT UT 10167800 Residential 2000 4

0.006123

0.00998

10168000 Residential 2000 3

0.005253

0.00655

10171000 Mixed 2000 1

0.0055

0.0055

403927111523601 Residential 2000 1

0.00271

0.00271

403945111501001 Urban 2000 1

0.00357

0.00357

404000111515801 Urban 2000 1

0.00223
219

Country State Station 

Identification

Land Use Year

Detection

Total

Average

Max

(ppb)

0.00223

404143111500101 Residential 2000 1

0.00248

0.00248

404349111512201 Residential 2000 1

0.00182

0.00182

404430111495301 Residential 2000 1

0.0017

0.0017

UTAH UT 400959111363201 Residential 2000 1

0.0226

0.0226

401442111402201 Residential 2000 1

0.00382

0.00382

ARLINGTON VA 01646580 Mixed 1996 4

0.0055

0.007

01652370 Urban 1994 1

0.006

0.006

FAIRFAX VA 01654000 Urban 1994 17

0.013176

0.041

1995 6

0.0105

0.019

1997 9

0.004923

0.008

1998 5

0.009818

0.0211

1999 6

0.00643

0.0102

2000 5

0.004774

0.00787

2003 1

0.0042

0.0042

2005 1

0.0064
220

Country State Station 

Identification

Land Use Year

Detection

Total

Average

Max

(ppb)

0.0064

01656920 Urban 1994 1

0.037

0.037

HARRISONBURG VA 01621400 Urban 1993 1

0.005

0.005

PRINCE VA 01656725 Mixed 1994 1

0.019

0.019

ROCKINGHAM VA 01621050 Agriculture 1997 3

0.002537

0.00367

1998 1

0.00246

0.00246

1999 1

0.00799

0.00799

2000 3

0.00883

0.0122

2001 1

0.0066

0.0066

2002 5

0.00552

0.0089

2003 2

0.021

0.0367

2009 1

0.0038

0.0038

SCOTT VA 03526000 Agriculture 1996 2

0.0055

0.006

SMYTH VA 03474000 Forest 1996 1

0.006

0.006

SOUTHAMPTON VA 02047360 Agriculture 1994 1

0.013

0.013

SURRY VA 02047480 Agriculture 1994 1

0.008
221

Country State Station 

Identification

Land Use Year

Detection

Total

Average

Max

(ppb)

0.008

WISE VA 03524550 Mining 1996 1

0.0097

0.0097

1997 1

0.0017

0.0017

1998 1

0.00421

0.00421

03529075 Mining 1996 1

0.007

0.007

WYTHE VA 03167000 Agriculture 1997 1

0.00265

0.00265

BENTON WA 12509696 Agriculture 2000 1

0.00252

0.00252

12510500 Mixed 1999 2

0.00561

0.00704

2001 2

0.00549

0.00612

2002 2

0.0041

0.0044

2003 4

0.00565

0.009

2004 4

0.00575

0.0078

2005 2

0.00455

0.0046

2006 2

0.00665

0.0086

2008 5

0.00778

0.0115

461141119510100 Agriculture 2000 1

0.0016
222

Country State Station 

Identification

Land Use Year

Detection

Total

Average

Max

(ppb)

0.0016

461517119402500 Agriculture 2000 2

0.01471

0.0265

461716119504600 Agriculture 2000 1

0.0198

0.0198

461717119460600 Agriculture 2000 1

0.0032

0.0032

FRANKLIN WA 12471724 Agriculture 1994 2

0.007

0.007

1995 1

0.059

0.059

12473508 Agriculture 1994 1

0.009

0.009

12473740 Agriculture 1993 10

0.0207

0.058

1994 4

0.02875

0.066

1997 1

0.0042

0.0042

GRANT WA 12464606 Agriculture 1994 2

0.007

0.008

12471090 Agriculture 1994 2

0.016

0.023

12471400 Mixed 1997 6

0.018233

0.0493

1998 6

0.00967

0.0215

1999 1

0.00587

0.00587

2000 3

0.01058
223

Country State Station 

Identification

Land Use Year

Detection

Total

Average

Max

(ppb)

0.0214

12472380 Agriculture 1993 13

0.028538

0.12

1994 2

0.0075

0.011

1995 5

0.0312

0.12

12472600 Mixed 1994 1

0.005

0.005

12472900 Not Applicable 1997 1

0.005

0.005

1999 1

0.00391

0.00391

2000 1

0.005

0.005

465322119333200 Agriculture 1994 1

0.005

0.005

470914119445700 Agriculture 1994 1

0.003

0.003

KING WA 12119795 Residential 1998 2

0.0182

0.02

12128000 Urban 1996 1

0.0059

0.0059

1997 2

0.0446

0.0745

LINCOLN WA 12464770 Agriculture 1999 1

0.00155

0.00155

2001 1

0.00446

0.00446

WHITMAN WA 13351000 Mixed 1997 1

0.011
224

Country State Station 

Identification

Land Use Year

Detection

Total

Average

Max

(ppb)

0.011

2003 1

0.0292

0.0292

2004 1

0.0047

0.0047

YAKIMA WA 12500420 Agriculture 1999 2

0.003865

0.00499

2000 2

0.00296

0.00364

12505410 Agriculture 1999 1

0.00308

0.00308

12505450 Agriculture 1999 5

0.002406

0.00427

2000 1

0.00512

0.00512

2001 2

0.00296

0.00368

2002 3

0.006667

0.0101

2003 8

0.009213

0.0201

2004 7

0.008543

0.0143

12508850 Agriculture 1999 1

0.00372

0.00372

461254120051300 Agriculture 2000 1

0.00373

0.00373

461700119595400 Agriculture 2000 1

0.0029

0.0029

462018120012000 Agriculture 2000 1

0.00231
225

Country State Station 

Identification

Land Use Year

Detection

Total

Average

Max

(ppb)

0.00231

462018120075200 Agriculture 2000 2

0.002695

0.00333

462023120075200 Agriculture 2003 7

0.0043

0.007

2004 4

0.00625

0.0174

462023120075240 Not Applicable 2004 1

0.0169

0.0169

462046120065600 Agriculture 2000 1

0.00298

0.00298

462603120174200 Agriculture 2000 2

0.0074

0.00858

462745120192400 Agriculture 2000 2

0.00525

0.00783

462836120202600 Agriculture 2000 4

0.005568

0.00837

463228120184400 Agriculture 2000 2

0.00231

0.00255

463343120385400 Agriculture 2000 2

0.012215

0.0159

BROWN WI 04085068 Not Applicable 2004 1

0.0063

0.0063

KEWAUNEE WI 040853145 Not Applicable 2003 1

0.0165

0.0165

2004 5

0.02746

0.0957

MILWAUKEE WI 04087000 Mixed 1994 1

0.016

0.016

1999 1

0.00198
226

Country State Station 

Identification

Land Use Year

Detection

Total

Average

Max

(ppb)

0.00198

2000 1

0.00344

0.00344

OUTAGAMIE WI 04072050 Cropland 1994 1

0.01

0.01

WINNEBAGO WI 04081897 Not Applicable 2003 1

0.0049

0.0049

PUTNAM WV 03201300 Mixed 1997 2

0.003955

0.00411

BIG WY 06279500 Mixed 1999 3

0.00269

0.00356

2008 2

0.00655

0.0088

Table C2. Qualified Detections of Chlorpyrifos-oxon in Surface Water. Data from United 

States Geological Survey National Water Quality Assessment (USGS NAWQA) accessed May 

21, 2010. 

Country State Station 

Identification

Land Use Year

Detection

Total

Average

Max

(ppb)

MERCED CA 373112120382901 Not Applicable 2004 4

0.020725

0.020725

LOUISA IA 05465500 Mixed 2005 1

0.0151

0.0151

GIBSON IN 03374100 Mixed 2008 1

0.0167

0.0167

2009 1

0.0132

0.0132

HANCOCK IN 394340085524601 Cropland 2008 1

0.021

0.021

PERRY IN 03303280 Not Applicable 2008 1
227

Country State Station 

Identification

Land Use Year

Detection

Total

Average

Max

(ppb)

0.0106

0.0106

POSEY IN 03378500 Not Applicable 2008 1

0.0185

0.0185

MONTGOMERY MO 06934500 Not Applicable 2008 2

0.0143

0.0143

WARREN MS 07288955 Mixed 2008 1

0.0197

0.0197

WASHINGTON MS 07288650 Cropland 2008 2

0.0459

0.0459

DODGE NE 06800000 Agriculture 2008 1

0.0108

0.0108

SARPY NE 06805500 Mixed 2008 1

0.0356

0.0356

PUTNAM OH 04186500 Cropland 2008 1

0.0196

0.0196

ORANGEBURG SC 02174250 Cropland 2005 1

0.0135

0.0135

Table C3. Qualified Detections of Chlorpyrifos in Groundwater. Data from United States 

Geological Survey National Water Quality Assessment (USGS NAWQA) accessed May 21, 

2010. 

Country State Station 

Identification

Land Use Year

Detection

Total

Average

Max

(ppb)

BIBB AL 02424000 Mixed 1999 5

0.002802

0.00376

2000 2

0.00382

0.00452

2001 2

0.003375

0.00483
228

CHOCTAW AL 02469762 Mixed 2000 1

0.00331

0.00331

JEFFERSON AL 02423515 Urban 2001 1

0.0022

0.0022

02456900 Urban 2001 1

0.00311

0.00311

MADISON AL 03575100 Mixed 2002 1

0.0041

0.0041

MONTGOMERY AL 02419977 Not Applicable 1999 1

0.0035

0.0035

2000 2

0.004755

0.00481

2001 3

0.005903

0.00863

PICKENS AL 02444490 Cropland 1999 1

0.0148

0.0148

2004 1

0.0037

0.0037

SHELBY AL 0242354750 Urban 1999 6

0.003108

0.00338

2000 3

0.002847

0.0029

2001 3

0.004303

0.0047

2002 1

0.0114

0.0114

2003 1

0.0024

0.0024

2004 1

0.0046

0.0046

2005 3

0.0041

0.0046

2009 1

0.0047
229

0.0047

ST CLAIR AL 0242339580 Urban 2000 1

0.00264

0.00264

CARROLL AR 07050500 Mixed 1995 1

0.003

0.003

PULASKI AR 07263620 Not Applicable 1998 1

0.00336

0.00336

2000 1

0.0035

0.0035

MARICOPA AZ 09517000 Agriculture 2009 3

0.007433

0.0084

332135112361501 Cropland 1997 2

0.00353

0.00353

SANTA CRUZ AZ 09481740 Urban 2009 1

0.0037

0.0037

YUMA AZ 09522000 Not Applicable 2009 2

0.0068

0.0087

CALIFORNIA CA 363805119345001 Orchard/Vineyard 1993 1

0.006

0.006

IMPERIAL CA 09429490 Not Applicable 1996 1

0.0028

0.0028

1997 1

0.0025

0.0025

MERCED CA 11260815 Mixed 2000 1

0.00366

0.00366

2001 8

0.00368

0.0048

11261100 Agriculture 1993 1

0.003

0.003

2001 2

0.00224

0.00288

11262900 Agriculture 2001 11

0.003352

0.0048

11273500 Mixed 1997 2
230

0.00304

0.00352

1998 2

0.003665

0.00373

1999 1

0.00356

0.00356

2000 5

0.003278

0.00365

2001 16

0.003219

0.0048

2002 2

0.0021

0.0023

2003 1

0.0036

0.0036

2004 2

0.01995

0.0206

2005 4

0.0054

0.0068

2006 3

0.0054

0.0069

2008 2

0.0053

0.0063

2009 7

0.005371

0.0083

371521120390800 Mixed 1994 1

0.003

0.003

371903120585400 Agriculture 2000 1

0.00387

0.00387

372323120481700 Agriculture 2000 2

0.00287

0.0032

2001 1

0.003

0.003

372424120432800 Mixed 2000 1

0.00308

0.00308
231

372829120420801 Not Applicable 2002 2

0.00385

0.0039

373112120382901 Not Applicable 2002 1

0.0676

0.0676

373115120382801 Not Applicable 2003 1

0.0046

0.0046

ORANGE CA 11075610 Mixed 1998 1

0.00228

0.00228

1999 2

0.00376

0.00378

2001 1

0.00463

0.00463

RIVERSIDE CA 11074000 Mixed 2008 1

0.0146

0.0146

SACRAMENTO CA 11447360 Urban 2001 4

0.004653

0.00618

2002 1

0.0036

0.0036

2003 1

0.0048

0.0048

2004 2

0.01355

0.0213

2005 3

0.0107

0.0238

2006 2

0.00545

0.0056

2008 3

0.006667

0.0074

11447650 Mixed 1997 1

0.0032

0.0032

2000 1

0.0032

0.0032

2002 1

0.0038
232

0.0038

20031

0.0037

0.0037

20041

0.0032

0.0032

20053

0.0053

0.006

20068

0.005113

0.0065

20076

0.00425

0.0066

20085

0.00402

0.0044

20092

0.0058

0.0087

SAN BERNARDINO CA 11060400 Urban 19981

0.00226

0.00226

19992

0.003055

0.00395

SAN JOAQUIN CA 11303500 Mixed 19941

0.002

0.002

19981

0.00304

0.00304

2000 11

0.00448

0.0117

2001 14

0.003411

0.0045

20027

0.006229

0.0179

20033

0.0042

0.0048

20044

0.005975

0.0074

20051
233

0.0044

0.0044

20064

0.0052

0.0062

2007 15

0.004973

0.0073

2008 10

0.00613

0.007

2009 12

0.006425

0.0092

20101

0.0064

0.0064

STANISLAUS CA 11274538 Agriculture 19931

0.003

0.003

19981

0.0037

0.0037

20002

0.003445

0.00382

20019

0.00327

0.00748

20025

0.0115

0.025

20033

0.0103

0.0224

20041

0.007

0.007

20052

0.0058

0.0064

20062

0.00605

0.0076

20102

0.0052

0.0052

11274570Mixed 2001 13

0.003396

0.00447
234

11274653 Agriculture 20001

0.00299

0.00299

20013

0.0029

0.0034

11290000 Mixed 19931

0.003

0.003

11290200 Mixed 20004

0.003115

0.00371

2001 11

0.003466

0.00485

11290500 Mixed 20015

0.004336

0.0049

373621121102801 Mixed 19941

0.003

0.003

373632121014701 Mixed 19952

0.004

0.004

373925120550701 Agriculture 19951

0.004

0.004

20003

0.00323

0.00349

374209121103800 Mixed 20004

0.003568

0.00395

2001 10

0.002864

0.00472

SUTTER CA 11391100 Cropland 20011

0.00154

0.00154

DENVER CO 06713500 Urban 20081

0.0057

0.0057

20092

0.00635

0.0071

06714000 Urban 19991

0.00896

0.00896

MESA CO 09153290 Agriculture 19973

0.002543
235

0.00311

1998 1

0.00288

0.00288

09163500 Mixed 1997 2

0.003115

0.00326

2004 1

0.0038

0.0038

MONTROSE CO 09149480 Agriculture 1997 2

0.00372

0.00379

WELD CO 06744000 Mixed 2001 1

0.0021

0.0021

06753990 Agriculture 2003 2

0.00425

0.0049

06754000 Mixed 1997 1

0.00171

0.00171

2000 1

0.00312

0.00312

2003 1

0.0045

0.0045

FAIRFIELD CT 01209710 Urban 1997 2

0.0034

0.00355

2002 1

0.0048

0.0048

HARTFORD CT 01184000 Mixed 1997 1

0.00276

0.00276

2000 1

0.00238

0.00238

2008 2

0.0053

0.0056

DISTRICT OF 

COLUMBIA

DC 01648010 Not Applicable 2000 2

0.005365

0.00816

COLLIER FL 261615081245902 Orchard/Vineyard 2009 2

0.0068

0.0068
236

DE SOTO FL 02296750 Mixed 2001 1

0.004

0.004

FLORIDA FL 262006081242602 Orchard/Vineyard 2009 1

0.0176

0.0176

HILLSBOROUGH FL 280500082313502 Urban 2005 2

0.0058

0.0058

LEON FL 02326838 Urban 1994 2

0.003

0.003

02329000 Mixed 1994 11

0.002364

0.003

MIAMI-DADE FL 252414080333200 Cropland 1997 2

0.00325

0.0035

2001 1

0.00249

0.00249

2002 1

0.0037

0.0037

PALM BEACH FL 02281200 Cropland 1997 1

0.00321

0.00321

1998 1

0.00292

0.00292

2000 1

0.00331

0.00331

2001 1

0.0032

0.0032

2005 1

0.0032

0.0032

2006 3

0.006133

0.0077

2007 1

0.0048

0.0048

BAKER GA 02353000 Mixed 1994 5

0.009

0.015

BROOKS GA 02318500 Mixed 2000 2

0.005085
237

0.0069

20011

0.00267

0.00267

20031

0.0033

0.0033

20051

0.0045

0.0045

CARROLL GA 02338000 Mixed 19971

0.00398

0.00398

19981

0.00353

0.00353

20052

0.0057

0.0065

20061

0.0061

0.0061

COBB GA 02335860 Residential 19941

0.004

0.004

02335864 Residential 19951

0.003

0.003

02335865 Residential 19941

0.004

0.004

02335869 Residential 19941

0.004

0.004

02335870 Residential 19932

0.003

0.003

19971

0.00322

0.00322

20003

0.003613

0.00395

20011

0.0039

0.0039

20024

0.00345

0.0042

20033
238

0.0038

0.0039

2005 1

0.0038

0.0038

02335910 Urban 2003 1

0.0026

0.0026

Urban Count of 

Chlorpyrifos_ wf

1

Urban Average of 

Chlorpyrifos_ wf2

0.0026

Urban Max of 

Chlorpyrifos_ wf3

0.0026

02336968 Residential 2003 1

0.0031

0.0031

COWETA GA 02344797 Not Applicable 2003 1

0.0027

0.0027

DECATUR GA 02357000 Mixed 1994 1

0.009

0.009

DEKALB GA 02336212 Urban 1995 1

0.003

0.003

DOUGHERTY GA 312908084151901 Cropland 2002 2

0.0046

0.0046

DOUGLAS GA 02337395 Not Applicable 2003 1

0.003

0.003

EARLY GA 310427084591101 Mixed 2002 2

0.003

0.003

FAYETTE GA 02344737 Not Applicable 2003 1

0.0031

0.0031

FULTON GA 02335741 Residential 1995 1

0.004

0.004

02335790 Residential 1995 1

0.004

0.004

02336250 Urban 1995 1

0.004

0.004

02336728 Urban 1995 1

0.002

0.002

2003 1
239

0.0026

0.0026

GEORGIA GA 311015084511901 Cropland 2002 1

0.0707

0.0707

313502083554801 Mixed 2002 1

0.0089

0.0089

320134084003703 Not Applicable 1997 1

0.0116

0.0116

320135084003803 Not Applicable 1997 1

0.00715

0.00715

HENRY GA 02204468 Not Applicable 2003 1

0.0026

0.0026

JASPER GA 02221000 Not Applicable 2003 1

0.0029

0.0029

LEE GA 02350900 Mixed 1994 1

0.011

0.011

MITCHELL GA 310913084195301 Cropland 2009 2

0.0049

0.0049

PIKE GA 02346358 Not Applicable 2003 1

0.0041

0.0041

SPALDING GA 02344480 Not Applicable 2003 1

0.0033

0.0033

SUMTER GA 02350080 Cropland 2001 1

0.0037

0.0037

2003 1

0.0031

0.0031

2005 1

0.0046

0.0046

2007 3

0.00543

3

0.0069

320135084003902 Not Applicable 1997 2

0.00343

0.00343

TIFT GA 02317797 Agriculture 1999 1

0.00347
240

0.00347

2000 1

0.00394

0.00394

BENTON IA 421705092142501 Cropland 1997 2

0.0038

0.0038

BREMER IA 05420680 Cropland 2008 2

0.0058

0.0064

BUENA VISTA IA 423840095135001 Mixed 2005 2

0.0034

0.0034

CLINTON IA 05420500 Not Applicable 1996 1

0.002

0.002

1997 2

0.00317

0.00376

1999 2

0.00733

0.0107

2000 1

0.00192

0.00192

05422000 Mixed 1996 1

0.0032

0.0032

DES MOINES IA 05474000 Mixed 1998 1

0.0594

0.0594

FLOYD IA 05461390 Cropland 1998 1

0.0031

0.0031

HAMILTON IA 423231093352021 Not Applicable 2007 2

0.0044

0.0044

423231093352051 Not Applicable 2007 2

0.0046

0.0046

423231093352052 Not Applicable 2007 2

0.0054

0.0054

HARDIN IA 05451210 Cropland 2005 1

0.0067

0.0067

2006 1

0.0045

0.0045

2007 1
241

0.0041

0.0041

2008 2

0.0045

0.0049

2009 3

0.0069

0.0087

IOWA IA 05453100 Mixed 1998 1

0.0291

0.0291

420240092535001 Residential/Comm

ercial

1997 1

0.00509

0.00509

421115091250501 Cropland 1997 1

0.00742

0.00742

422518092144701 Cropland 1997 1

0.0207

0.0207

423419093172401 Cropland 1997 1

0.00705

0.00705

424548092101701 Cropland 1997 1

0.00568

0.00568

430442092402201 Residential/Comm

ercial

1997 1

0.00412

0.00412

JOHNSON IA 05454500 Not Applicable 2007 2

0.00535

0.0062

05455100 Cropland 1998 1

0.0038

0.0038

LOUISA IA 05465500 Mixed 1997 2

0.02485

0.0478

1998 1

0.0261

0.0261

2009 1

0.0036

0.0036

MARSHALL IA 420347092541601 Residential/Comm

ercial

1997 2

0.00344

0.00344

TAMA IA 05464220 Cropland 1997 2
242

0.00292

5

0.00378

WASHINGTON IA 05455570 Cropland 1997 1

0.004

0.004

WRIGHT IA 05449500 Cropland 1997 1

0.00217

0.00217

2004 1

0.0037

0.0037

BEAR LAKE ID 10068500 Rangeland 2001 1

0.00441

0.00441

ELMORE ID 13154500 Mixed 2005 1

0.0038

0.0038

2007 1

0.0031

0.0031

MINIDOKA ID 424355113503201 Cropland 2005 2

0.003

0.003

TWIN FALLS ID 13092747 Agriculture 2000 2

0.00225

0.00306

2005 2

0.00335

0.0034

2008 3

0.00436

7

0.0054

ALEXANDER IL 07022000 Not Applicable 1997 3

0.00265

7

0.00304

COOK IL 05531500 Urban 2007 6

0.00556

7

0.0075

05532500 Mixed 2003 1

0.0049

0.0049

IROQUOIS IL 05525500 Cropland 2000 1

0.00382

0.00382

2001 1

0.0025

0.0025
243

JERSEY IL 05587455 Not Applicable 1997 1

0.00365

0.00365

LA SALLE IL 05552500 Mixed 1996 1

0.0027

0.0027

05553500 Mixed 1997 1

0.003

0.003

1998 2

0.01671

5

0.0303

2000 1

0.0037

0.0037

2001 1

0.0025

0.0025

MCDONOUGH IL 05584500 Cropland 1997 1

0.104

0.104

1998 1

0.00382

0.00382

PIATT IL 05572000 Cropland 1997 5

0.04507

8

0.117

1998 1

0.00223

0.00223

2008 3

0.00473

3

0.0054

PULASKI IL 03612500 Not Applicable 1996 2

0.003

0.0032

1997 2

0.00299

0.00365

1998 2

0.01436

0.025

1999 1

0.00301

0.00301

2000 2

0.00326

5
244

0.00328

2001 2

0.00227

0.00334

SCOTT IL 05586100 Mixed 1997 2

0.00398

0.004

2001 1

0.0025

0.0025

2002 1

0.0046

0.0046

2006 2

0.0047

0.0048

2008 1

0.0057

0.0057

STARK IL 05568800 Cropland 1996 1

0.0037

0.0037

WOODFORD IL 05567000 Cropland 1997 1

0.0039

0.0039

GIBSON IN 03374100 Mixed 1997 1

0.00822

0.00822

2000 2

0.00305

5

0.00347

2003 2

0.00315

0.0039

2005 1

0.0046

0.0046

HAMILTON IN 395743086030501 Not Applicable 2003 1

0.0045

0.0045

2005 2

0.00375

0.004

HANCOCK IN 394340085524601 Cropland 2003 3

0.00356

7

0.0048

2004 2

0.00295

0.0047
245

20061

0.005

0.005

20082

0.00625

0.0077

MARION IN 03353637 Urban 19922

0.003

0.003

19931

0.002

0.002

19972

0.0032

0.00348

19981

0.00386

0.00386

20011

0.0019

0.0019

PERRY IN 03303280 Not Applicable 19962

0.00375

0.004

19982

0.00294

0.00338

20002

0.010825

0.018

POSEY IN 03378500 Not Applicable 19982

0.03185

0.0608

19992

0.00797

0.0132

20003

0.00323

0.00368

20011

0.004

0.004

20022

0.0034

0.0036

20041

0.0047

0.0047

20081
246

0.0064

0.0064

PUTNAM IN 03357330 Not Applicable 2002 1

0.0037

0.0037

GRAY KS 375502100363601 Agriculture 2000 2

0.00284

0.00284

KANSAS KS 370130101180904 Agriculture 2000 1

0.0184

0.0184

370941101540001 Agriculture 2000 1

0.0122

0.0122

371909101413101 Agriculture 2000 1

0.00684

0.00684

GREENUP KY 03216600 Not Applicable 1997 2

0.00500

5

0.00602

1998 3

0.00276

0.00348

1999 1

0.00342

0.00342

2000 2

0.00241

5

0.00275

MCCRACKEN KY 03609750 Not Applicable 1997 1

0.00253

0.00253

1998 1

0.00306

0.00306

1999 1

0.00274

0.00274

2000 1

0.00351

0.00351

2008 1

0.0053

0.0053

ACADIA LA 08011020 Cropland 2000 1

0.00273

0.00273

301906092272401 Cropland 2000 2

0.00392
247

0.00392

302403092152300 Cropland 2000 1

0.00186

0.00186

302749092203500 Cropland 2000 1

0.00289

0.00289

ASSUMPTION LA 073814675 Mixed 2000 1

0.00279

0.00279

EAST BATON ROUGE LA 07379960 Urban 1999 1

0.00376

0.00376

2000 5

0.00441

6

0.00602

2001 1

0.0033

0.0033

2002 1

0.0047

0.0047

2003 1

0.0043

0.0043

IBERVILLE LA 07381440 Cropland 1998 1

0.00362

0.00362

2000 1

0.00398

0.00398

JEFFERSON DAVIS LA 08012150 Mixed 2000 1

0.0157

0.0157

2004 1

0.0064

0.0064

2005 1

0.0069

0.0069

2007 7

0.00538

6

0.0079

LAFOURCHE LA 07381002 Cropland 1999 2

0.00239

0.00328

POINTE COUPEE LA 07381495 Not Applicable 1998 1

0.0077

0.0077
248

2004 1

0.0041

0.0041

ST. LANDRY LA 08010000 Cropland 2000 1

0.00246

0.00246

ST. MARY LA 07381600 Not Applicable 2008 1

0.0059

0.0059

MASSACHUSETTS MA 420309073183601 Mixed 2002 1

0.006

0.006

MIDDLESEX MA 01102500 Urban 1999 1

0.00958

0.00958

NORFOLK MA 01105000 Urban 2000 1

0.00324

0.00324

PLYMOUTH MA 01106468 Urban 2000 1

0.00288

0.00288

FREDERICK MD 01639000 Agriculture 1995 1

0.004

0.004

HARFORD MD 01578310 Mixed 1996 1

0.004

0.004

1997 1

0.00225

0.00225

2000 1

0.00157

0.00157

2001 1

0.0012

0.0012

2009 1

0.0059

0.0059

KENT MD 01493112 Agriculture 1999 5

0.00307

6

0.00393

2000 2

0.00313

0.00336

2002 1

0.0027

0.0027

MACOMB MI 04161820 Urban 1996 1
249

0.004

0.004

1997 2

0.00353

0.004

2001 1

0.0028

0.0028

ANOKA MN 05288650 Not Applicable 2005 2

0.00625

0.0071

BLUE EARTH MN 05320270 Agriculture 2005 1

0.0033

0.0033

2006 4

0.00452

5

0.0058

2007 5

0.0052

0.0072

DAKOTA MN 05331580 Mixed 1998 1

0.00377

0.00377

2000 1

0.00163

0.00163

2009 1

0.0078

0.0078

HENNEPIN MN 05288705 Urban 1997 1

0.00844

0.00844

CEDAR MO 374159093474401 Mixed 1993 2

0.003

0.003

MISSOURI MO 382027092474801 Mixed 1993 1

0.013

0.013

STODDARD MO 07043500 Cropland 1997 1

0.0039

0.0039

WARREN MS 07288955 Mixed 2005 1

0.0037

0.0037

2006 2

0.0054

0.0062

2007 1

0.0062
250

0.0062

2009 2

0.00745

0.0079

WASHINGTON MS 07288650 Cropland 2006 1

0.0044

0.0044

2007 2

0.00515

0.0055

RICHLAND MT 06329500 Mixed 1998 2

0.00278

0.00288

2000 3

0.00185

3

0.00202

ROSEBUD MT 06295000 Mixed 1999 1

0.00177

0.00177

2009 1

0.0048

0.0048

GREENE NC 02091500 Mixed 1997 1

0.0033

0.0033

1998 2

0.00537

0.00805

2000 2

0.00265

5

0.00314

2001 1

0.0027

0.0027

2005 1

0.0038

0.0038

2008 3

0.0069

0.0077

JOHNSTON NC 0208755215 Not Applicable 2005 1

0.0037

0.0037

LENOIR NC 02089500 Mixed 1997 1

0.003

0.003

1998 2

0.0033

0.00358
251

2003 1

0.0036

0.0036

MADISON NC 0345292005 Agriculture 1997 1

0.00382

0.00382

NORTH CAROLINA NC 361717076201301 Agriculture 1994 1

0.006

0.006

PITT NC 02084160 Agriculture 1992 3

0.003

0.003

TRANSYLVANIA NC 03439000 Reference 1997 1

0.00347

0.00347

WAKE NC 0208726370 Not Applicable 2003 1

0.0025

0.0025

0208726995 Not Applicable 2003 1

0.0022

0.0022

0208732610 Not Applicable 2003 1

0.004

0.004

02087580 Urban 2003 1

0.0079

0.0079

2007 1

0.0051

0.0051

WAYNE NC 352905077594502 Agriculture 2007 2

0.0046

0.0046

CASS ND 05053800 Mixed 1995 1

0.004

0.004

GRAND FORKS ND 05082625 Cropland 2000 1

0.00257

0.00257

PEMBINA ND 05102490 Mixed 1994 1

0.003

0.003

1999 1

0.00345

0.00345

COLFAX NE 06799750 Not Applicable 2004 1

0.0043

0.0043

DODGE NE 06800000 Agriculture 1998 3

0.03553
252

7

0.0843

19991

0.0113

0.0113

20022

0.0031 0.0037

20034

0.003875

0.0048

20042

0.0047

0.0047

20051

0.0031

0.0031

20087

0.005271

0.0058

DOUGLAS NE 06610000 Not Applicable20021

0.0037

0.0037

20041

0.0044

0.0044

06800500 Mixed 20075

0.00472

0.0054

PLATTE NE 06795500 Agriculture 20099

0.005711

0.0095

SARPY NE 06805500 Mixed 19972

0.0032

0.00384

19991

0.0586

0.0586

20021

0.001

0.001

20031

0.0028

0.0028

20041

0.0045

0.0045

20071
253

0.004

0.004

2008 2

0.0044

0.0044

2009 1

0.0076

0.0076

HILLSBOROUGH NH 01094161 Urban 2000 1

0.00143

0.00143

BERGEN NJ 01390450 Other/Mixed 1997 1

0.0023

0.0023

01390500 Residential 1996 1

0.004

0.004

BURLINGTON NJ 01467000 Reference 2000 1

0.00483

0.00483

CAMDEN NJ 01467150 Residential 1999 1

0.00323

0.00323

2000 2

0.00358

0.00377

2001 2

0.0034

0.0039

393940074534201 Forest 2001 2

0.0031

0.0031

GLOUCESTER NJ 01477120 Cropland 2001 1

0.004

0.004

MERCER NJ 01463500 Mixed 2000 1

0.00231

0.00231

2001 1

0.0023

0.0023

2006 1

0.0053

0.0053

01463810 Urban 2000 2

0.00255

0.00288

01464500 Agriculture 1999 1

0.00242

0.00242
254

MORRIS NJ 01381295 Commercial/Indust

rial

1997 1

0.001

0.001

01381800 Commercial/Indust

rial

1997 1

0.0036

0.0036

SOMERSET NJ 01403300 Mixed 1996 1

0.0013

0.0013

1998 1

0.00365

0.00365

2001 1

0.0041

0.0041

01403900 Urban 2001 2

0.0057

0.008

2004 1

0.0114

0.0114

2007 1

0.0079

0.0079

SUSSEX NJ 01367770 Forest 1997 1

0.0016

0.0016

CLARK NV 094196783 Urban 1994 3

0.03

0.047

1995 2

0.1135

0.16

1998 3

0.00356

3

0.0038

1999 1

0.0023

0.0023

2000 3

0.00290

7

0.00386

2001 4

0.00290

3

0.00382

2007 1
255

0.0055

0.0055

STOREY NV 10350500 Mixed 2000 1

0.00295

0.00295

2005 1

0.0062

0.0062

SCHENECTADY NY 01356190 Residential 2005 1

0.0054

0.0054

ASHTABULA OH 04211820 Pasture 1997 1

0.00393

0.00393

BUTLER OH 03274000 Mixed 2000 1

0.00324

0.00324

2001 1

0.002

0.002

CLERMONT OH 03246400 Cropland 2000 1

0.0035

0.0035

GREENE OH 393903083582900 Urban 2001 1

0.0049

0.0049

LUCAS OH 04193500 Mixed 1997 2

0.0038

0.0039

2000 1

0.00374

0.00374

2001 2

0.00335

0.0037

2002 1

0.003

0.003

2005 1

0.005

0.005

2006 6

0.00491

7

0.006

2007 4

0.00466

5

0.0057

MONTGOMERY OH 393944084120700 Urban 1999 1

0.00173
256

0.00173

2000 1

0.00338

0.00338

2001 3

0.00423

3

0.0047

PUTNAM OH 04186500 Cropland 1997 1

0.011

0.011

2005 1

0.0043

0.0043

2008 1

0.0037

0.0037

CLACKAMAS OR 452414122213200 Not Applicable 2004 4

0.00297

5

0.0046

COLUMBIA OR 14246900 Not Applicable 1996 1

0.0023

0.0023

1998 3

0.00356

0.004

2000 1

0.00348

0.00348

2007 2

0.0054

0.0056

2008 2

0.0058

0.0067

2009 1

0.005

0.005

2010 2

0.00405

0.0061

MARION OR 14201300 Agriculture 1996 1

0.0037

0.0037

1999 1

0.00377

0.00377

2000 2

0.00302

0.00306
257

2001 3

0.00412

0.00484

2002 4

0.00397

5

0.0049

2003 7

0.00378

6

0.0044

2005 1

0.0074

0.0074

2006 1

0.0073

0.0073

2008 5

0.00518

0.0062

445551123015800 Not Applicable 2004 2

0.00355

0.0037

450022123012400 Not Applicable 2003 1

0.0019

0.0019

2004 2

0.0037

0.0044

MULTNOMAH OR 14128910 Not Applicable 1998 1

0.0036

0.0036

14211720 Mixed 1996 2

0.003

0.003

1997 4

0.00289

3

0.0038

1998 4

0.00268

8

0.00343

1999 4

0.00264

5

0.00365

2000 3

0.00487

7

0.0075
258

2003 1

0.0021

0.0021

2005 2

0.00535

0.0065

2006 3

0.0054

0.0067

2007 7

0.00507

1

0.006

2008 3

0.00526

7

0.0055

2009 1

0.0063

0.0063

WASHINGTON OR 14206950 Urban 1995 1

0.0023

0.0023

2001 5

0.00291

8

0.0042

2002 2

0.0037

0.0049

2005 1

0.0052

0.0052

2006 1

0.007

0.007

2007 1

0.0046

0.0046

2009 1

0.0066

0.0066

ALLEGHENY PA 03049646 Urban 1997 1

0.00264

0.00264

BERKS PA 01470779 Cropland 2000 1

0.00261

0.00261

01470818 Agriculture 2000 1

0.00344

0.00344
259

01471520 Urban 2000 1

0.00248

0.00248

BUCKS PA 01462949 Urban 2000 1

0.0014

0.0014

01464907 Residential 2000 1

0.00487

0.00487

2001 1

0.0037

0.0037

CHESTER PA 01472157 Cropland 2000 2

0.00242

5

0.00258

01480890 Urban 2000 1

0.00192

0.00192

DELAWARE PA 01475510 Urban 2000 1

0.00161

0.00161

01475543 Urban 2000 2

0.0026

0.00334

INDIANA PA 03037525 Agriculture 1997 2

0.0034

0.00376

LEBANON PA 01573095 Agriculture 1995 5

0.004

0.004

401704076293101 Mixed 1995 1

0.004

0.004

MONTGOMERY PA 01473470 Urban 2000 1

0.00208

0.00208

NORTHAMPTON PA 01454700 Mixed 2000 1

0.0022

0.0022

PHILADELPHIA PA 01474500 Mixed 2000 5

0.00346

8

0.0049

2001 1

0.0013

0.0013

2002 1

0.0049

0.0049

PIKE PA 01434000 Mixed 2000 1
260

0.00272

0.00272

SCHUYLKILL PA 01555400 Agriculture 2000 3

0.00251

7

0.00345

GREENVILLE SC 021603257 Urban 1996 2

0.0035

0.004

ORANGEBURG SC 02174250 Cropland 1996 8

0.00315

0.004

1999 1

0.00387

0.00387

2000 3

0.00341

3

0.00366

2001 3

0.00386

0.0048

2005 2

0.00505

0.006

2006 8

0.00506

3

0.0075

2007 1

0.005

0.005

2008 4

0.00592

5

0.0073

RICHLAND SC 021695601 Urban 1996 1

0.0018

0.0018

021695617 Urban 1996 1

0.0032

0.0032

02169570 Urban 1996 4

0.00327

5

0.0037

2001 2

0.00302

0.00414

2003 1

0.0048
261

0.0048

335729080553901 Residential/Comm

ercial

1996 2

0.003

0.003

SOUTH CAROLINA SC 335841080582001 Residential/Comm

ercial

1996 1

0.0045

0.0045

HUGHES SD 06440000 Not Applicable 1998 1

0.00344

0.00344

YANKTON SD 06467500 Not Applicable 2003 1

0.0036

0.0036

CLAIBORNE TN 03528000 Mixed 1997 1

0.0034

0.0034

COCKE TN 03455000 Mixed 1996 1

0.002

0.002

1997 1

0.00331

0.00331

03467609 Mixed 1996 2

0.00265

0.0033

GREENE TN 03466208 Agriculture 1996 1

0.002

0.002

BEXAR TX 08178800 Urban 1997 1

0.00311

0.00311

1998 1

0.00271

0.00271

2005 2

0.00605

0.0066

08181800 Mixed 1997 3

0.00348

7

0.00388

2001 1

0.00432

0.00432

CAMERON TX 08470400 Not Applicable 1997 1

0.0034

0.0034

2003 1

0.0035
262

0.0035

20071

0.0019

0.0019

08475000 Not Applicable 19961

0.003

0.003

20031

0.0046

0.0046

20061

0.0044

0.0044

20072

0.00535

0.0059

20084

0.005775

0.0063

20093

0.006

0.0069

DALLAS TX 08055500 Not Applicable 20031

0.0033

0.0033

08057200 Urban 19982

0.00369

0.00377

19992

0.00296

0.0032

20005

0.006406

0.0125

20014

0.003038

0.0044

20024

0.00375

0.0048

20032

0.00465

0.0049

20071

0.0043

0.0043

08057410 Mixed 19981

0.0032
263

0.0032

2005 1

0.0042

0.0042

2008 2

0.0065

0.0066

08057448 Mixed 2000 2

0.00302

0.00324

DENTON TX 08051500 Reference 1997 1

0.00317

0.00317

2002 1

0.0029

0.0029

EL PASO TX 08364000 Mixed 1995 1

0.003

0.003

1996 3

0.0034

0.0038

1997 3

0.00325

0.00359

1999 1

0.00148

0.00148

2000 3

0.00296

0.00346

2001 2

0.00266

0.003

2003 2

0.00335

0.0044

2005 4

0.00572

5

0.0072

2006 9

0.00538

9

0.0071

2007 3

0.00683

3

0.0076

FORT BEND TX 08116650 Not Applicable 2008 1

0.0075
264

0.0075

KENDALL TX 08167000 Mixed 1997 1

0.00187

0.00187

MEDINA TX 08180640 Agriculture 1997 2

0.00351

0.00377

NAVARRO TX 08064100 Agriculture 2006 1

0.0062

0.0062

PRESIDIO TX 08374200 Not Applicable 1999 1

0.00347

0.00347

2003 1

0.0029

0.0029

TEXAS TX 294309099015701 Mixed 1996 1

0.004

0.004

295015094440701 Mixed 1994 1

0.005

0.005

325829097513601 Mixed 1994 1

0.005

0.005

354918102020901 Mixed 1999 1

0.00674

0.00674

WEBB TX 08459200 Not Applicable 2001 1

0.0027

0.0027

2003 1

0.0042

0.0042

2004 1

0.0037

0.0037

CACHE UT 10102200 Agriculture 2000 1

0.00273

0.00273

DAVIS UT 410041111581101 Residential 2000 1

0.00189

0.00189

410342111574201 Residential 2000 1

0.00199

0.00199

410453111570001 Residential 2000 1

0.00183

0.00183

410501111555201 Residential 2000 1
265

0.00387

0.00387

GRAND UT 09180500 Not Applicable 1997 1

0.00265

0.00265

SALT LAKE UT 10167800 Residential 2000 1

0.00155

0.00155

403927111523601 Residential 2000 1

0.00271

0.00271

403945111501001 Urban 2000 1

0.00357

0.00357

404000111515801 Urban 2000 1

0.00223

0.00223

404143111500101 Residential 2000 1

0.00248

0.00248

404349111512201 Residential 2000 1

0.00182

0.00182

404430111495301 Residential 2000 1

0.0017

0.0017

UTAH UT 401442111402201 Residential 2000 1

0.00382

0.00382

ARLINGTON VA 01646580 Mixed 1996 1

0.004

0.004

FAIRFAX VA 01654000 Urban 1995 1

0.003

0.003

1997 3

0.00333

0.00358

1998 2

0.00365

0.00373

1999 1

0.0037

0.0037

2000 2

0.00299

0.00387

2003 1

0.0042

0.0042
266

2005 1

0.0064

0.0064

ROCKINGHAM VA 01621050 Agriculture 1997 3

0.00253

7

0.00367

1998 1

0.00246

0.00246

2002 2

0.00295

0.0035

2009 1

0.0038

0.0038

VIRGINIA VA 383152078570902 Not Applicable 1994 1

0.026

0.026

383202078571201 Not Applicable 1994 1

0.005

0.005

WISE VA 03524550 Mining 1997 1

0.0017

0.0017

WYTHE VA 03167000 Agriculture 1997 1

0.00265

0.00265

BENTON WA 12509696 Agriculture 2000 1

0.00252

0.00252

12510500 Mixed 2001 1

0.00486

0.00486

2002 2

0.0041

0.0044

2003 2

0.00385

0.0043

2004 1

0.0039

0.0039

2005 2

0.00455

0.0046

2006 1

0.0047

0.0047

2008 2
267

0.00575

0.0059

461141119510100 Agriculture 2000 1

0.0016

0.0016

461517119402500 Agriculture 2000 1

0.00292

0.00292

461717119460600 Agriculture 2000 1

0.0032

0.0032

GRANT WA 12471400 Mixed 1997 1

0.00397

0.00397

1998 1

0.00369

0.00369

2000 1

0.00399

0.00399

12472380 Agriculture 1995 1

0.003

0.003

12472900 Not Applicable 1999 1

0.00391

0.00391

470914119445700 Agriculture 1994 1

0.003

0.003

KING WA 471907122200401 Not Applicable 2005 2

0.0051

0.0051

LINCOLN WA 12464770 Agriculture 1999 1

0.00155

0.00155

2001 1

0.00446

0.00446

WHITMAN WA 13351000 Mixed 2004 1

0.0047

0.0047

YAKIMA WA 12500420 Agriculture 1999 1

0.00274

0.00274

2000 2

0.00296

0.00364

12505410 Agriculture 1999 1

0.00308

0.00308
268

12505450 Agriculture 1999 4

0.00194

0.00315

2001 2

0.00296

0.00368

2002 1

0.003

0.003

2003 3

0.00333

3

0.0043

2004 2

0.0022

0.0023

12508850 Agriculture 1999 1

0.00372

0.00372

461254120051300 Agriculture 2000 1

0.00373

0.00373

461700119595400 Agriculture 2000 1

0.0029

0.0029

462018120012000 Agriculture 2000 1

0.00231

0.00231

462018120075200 Agriculture 2000 2

0.00269

5

0.00333

462023120075200 Agriculture 2003 5

0.0034

0.0048

2004 3

0.00253

3

0.0033

462046120065600 Agriculture 2000 1

0.00298

0.00298

462745120192400 Agriculture 2000 1

0.00267

0.00267

462836120202600 Agriculture 2000 1

0.00351

0.00351

463228120184400 Agriculture 2000 2

0.00231

0.00255
269

MILWAUKEE WI 04087000 Mixed 1999 1

0.00198

0.00198

2000 1

0.00344

0.00344

WINNEBAGO WI 04081897 Not Applicable 2003 1

0.0049

0.0049

PUTNAM WV 03201300 Mixed 1997 1

0.0038

0.0038

BIG HORN WY 06279500 Mixed 1999 3

0.00269

0.00356

2008 1

0.0043

0.0043

Table C4. Qualified Detections of Chlorpyrifos-oxon in Groundwater. Data from United 

States Geological Survey National Water Quality Assessment (USGS NAWQA) accessed May 

21, 2010. 

Country State Station 

Identification

Land Use Year

Detection

Total

Average

Max

(ppb)

COLBERT AL 344131087335201 Agriculture 2009 1

0.0553

0.0553

CAMDEN NJ 394233074574401 Residential/

Commercial

2009 1

0.0359

0.0359

CALDWELL TX 295051097274800 Mixed 2008 1

0.0078

0.0078

Table C5. Detections of Chlorpyrifos in Surface Water. Data from the USGS-EPA Pilot 

Reservoir Monitoring Program

State Sample Description Station Identification Date

Detection

(ppb)

LA wsrin 315856091151900 4/29/1999 0.0081

LA wsrout 315914091154500 4/29/1999 0.0062

LA wsrin 315856091151900 5/13/1999 0.0054

LA wsrout 315914091154500 5/13/1999 0.0055

LA wsrout 315914091154500 6/2/1999 0.004

OH wsrout 390158084090400 6/9/1999 0.0064
270

State Sample Description Station Identification Date

Detection

(ppb)

OK wsrin 353833097211801 7/6/1999 0.0021

LA wsrin 315856091151900 9/8/1999 0.0062

PA wsrin 1470962 1/19/2000 0.0027

OH wsrin 390214084081800 3/28/2000 0.0039

PA wsrin 1470962 6/1/2000 0.0034

PA wsrin 1470962 6/29/2000 0.0118

OH wsrin 390214084081800 7/6/2000 0.0023

PA wsrin 1470962 7/11/2000 0.008

MO wsrin 6907785 7/19/2000 0.0341

PA wsrin 1470962 8/2/2000 0.0041

OK wsrin 353833097211801 8/2/2000 0.0043

SC wsrin 2155401 9/6/2000 0.0023

SC wsrin 2155401 9/11/2000 0.0018

SC wsrin 2155401 9/20/2000 0.0025

SC wsrin 2155401 9/26/2000 0.0024

Table C6. Chlorpyrifos Detections in Drinking Water. Total samples may include both 

untreated and finished water. Data taken from USDA Pesticide Data Program.

Year

Total Samples 

Screened

Samples with 

Detections

Maximum 

Detection

2001 283 0 0

2002 664 0 0

2003 794 0 0

2004 478 0 0

2005 462 0 0

2006 471 0 0

2007 466 0 0

2008 240 0 0

Table C7. Chlorpyrifos-oxon Detections in Drinking Water. Total samples may include both 

untreated and finished water. Data taken from USDA Pesticide Data Program.

Year

Total Samples 

Screened

Samples with 

Detections

Maximum 

Detection

2001 134 0 0

2002 381 0 0

2003 509 0 0

2004 240 0 0

2005 224 0 0

2006 236 0 0

2007 238 0 0

2008 0 0 0
271

Table C8. Chlorpyrifos-oxon Detections in Maumee River; National Center for Water Quality 

Research at Heidelberg College

Year

Number of 

Samples

Average 

Concetration 

of 

chlorpyrifos 

(ug/L)

Max 

Concetration 

of 

chlorpyrifos 

(ug/L)

1983 62 0.0000 0.0000

1984 88 0.0000 0.0000

1985 65 0.0000 0.0000

1986 75 0.0000 0.0000

1987 53 0.0156 0.1000

1988 41 0.0138 0.2820

1989 67 0.0028 0.0600

1990 91 0.0008 0.0460

1991 72 0.0397 2.0800

1992 85 0.4703 24.0120

1993 78 0.0859 3.9330

1994 61 0.0075 0.1740

1995 156 0.0042 0.1760

1996 164 0.0091 0.6360

1997 101 0.0062 0.0750

1998 114 0.0000 0.0000

1999 62 0.0000 0.0000

Grand Total 1435 0.0379 24.012

**One sample (5/2/1998) has been removed from the dataset as it was a ― -1‖ value. Further analysis of the 

source will be investigated.
272

Table C9. Chlorpyrifos-oxon Detections in Sandusky River; National Center for 

Water Quality Research at Heidelberg College

Year

Number of 

Samples 

Average 

Concentration of 

Chlorpyrifos (ug/L)

Max 

Concentration of 

Chlorpyrifos 

(ug/L)

1983 58 0.0000 0.0000

1984 79 0.0000 0.0000

1985 92 0.0000 0.0000

1986 75 0.0000 0.0000

1987 72 0.0739 3.8360

1988 34 0.0079 0.2250

1989 87 0.0087 0.1320

1990 90 0.0274 2.4560

1991 76 0.0488 1.5520

1992 100 0.3006 10.9160

1993 80 0.1686 6.5890

1994 66 0.0175 1.1500

1995 200 0.0067 0.3330

1996 170 0.0310 4.0000

1997 127 0.0032 0.0730

1998 120 0.0019 0.0960

1999 69 0.0410 2.8300

Grand Total 1595 0.0422 10.916