UNITED STATES ENVIRONMENTAL PROTECTION AGENCY 

WASHINGTON, ,D.C. 20460 

OFFICE OF 

PREVE~TION, PESTICIDES AND 

TC)XIC SUBSTANCES 

Date: ~ukust 7,2009 

MEMORANDUM 

SUBJECT: Propamocarb hydrochloride: Tier I Drinking Water Estimated Environmental ~ 

Concentrations for use in the Human Health Risk Assessment. I 

TO: Susan Stanton, Risk Manager Reviewer 

Barbara Madden, Team Leader 

Minor Use Team 

Registration Division (7505P) r.? 

FROM: Chuck Peck, Environmental Engineer d?/,$ 

Environmental Risk Branch IV 

Environmental Fate and Effects Division (7507P) 

REVIEWED 

BY: Marietta Echeverria, Environmental Scientist, RAPL m.. &&\~6.cgr 

%f I {&1 

Environmental Risk Branch IV 

Environmental Fate and Effects Division (7507P) 

APPROVED 

BY: Elizabeth Behl, Branch Chief 

Environmental Risk Branch IV 

Environmental Fate and Effects Division (7507P) I ~ 

EXECUTIVE SUMMARY 

This memo summarizes the Tier I Estimated Drinking Water Concentrations (EPWCs) for 

propamocarb hydrochloride in support of the proposed new use on lima beans. Propamocarb h4ldrochloride 

(CAS 25606-41 -I), a fungicide, is an active ingredient in several registered pesticide products, incloding Ban01 

(EPA Reg. No. 432-942), Promess (EPA Reg. No. 55260-lo), Proplant (EPA Reg. No. 55260-9), sind Previcur 

Flex (EPA Reg. No. 264-678). The previous drinking water assessment evaluated multiple piopamocarb 

hydrochloride applications to turf; however, a higher rate to ornamentals has been identified, reqviring a new 

drinking water assessment. , 

I 

The assessment is a Tier I screening-level assessment conducted using the models SCI@ROW and 

FIRST with maximum application rates. Additional refinements of the assessment can be dev$loped with 

higher tier analysis, if requested by HED. 

~ 

TEXT SEARCHABLE DOCUMENT - 2009
The maximum proposed application rate for the proposed new use of lima beans considered for this 

assessment is 1.5 lbs ai/acre/application, applied 4 times per year with a 7-day reapplication interval for a 

maximum total annual application rate of 6.0 1b ai/Alyr. 

The computer models FIRST (surface water) and SCI-GROW (groundwater) were used to develop the 

EDWCs for use in the human health risk assessment. Because the maximum application rates for the new uses 

assessed here are less than the application rate for container-grown ornamentals in nurseries, the values for 

container-grown ornamentals are recommended for use in the human health risk assessment. In a previous Tier 

1 drinking water assessment for propamocarb hydrochloride on turf grass (drinking water memo of November 

10,2003; DP Barcode 267925), an application rate of 8.2 lbs ai/acre applied 3 times with a 7-day retreatment 

interval was used. The potential label application rate for container-grown ornamentals is 128 lb ai/A (EPA 

Reg. No. 55260-9). The container-grown ornamentals can be retreated on a 3 week (21 day) interval. The label 

does not indicate the maximum number of applications, nor does it limit the maximum amount applied. Using 

the retreatment interval of 3 weeks, over the course of a year (52 weeks), the maximum number of treatments 

that are possible is 17. The total maximum annual application rate is 2,176 lbs/A/year. 

For ground spray applications to container-grown ornamentals, the estimated annual acute 

concentration of propamocarb hydrochloride in surface water sources of drinking water is 14,568 pg/L (ppb). 

The estimated chronic concentration is 1,157 pg/L. For comparison purposes, if only one application was 

made, the estimated annual acute concentration in surface water sources of drinking water would be 7,175 

pg/L and the estimated chronic concentration would be 566 pg/L. The FlRST output file is attached. As a 

point of reference, the previously reported acute and chronic values were 972 and 77 ppb, respectively. The 

acute and chronic values for lima bean applications were 221 and 18 ppb, respectively 

For groundwater sources of drinking water, the estimated concentration of propamocarb hydrochloride 

in shallow groundwater is 264 pglL. For comparison purposes, if only one application was performed, the 

estimated concentration in shallow groundwater would be 15.5 pg/L. The SCIGROW output file is attached. 

As a point of reference, the previously reported value was 2.99 ppb. The reported value for lima beans is 0.73 

PP~. 

Modeling results for propamocarb hydrochloride in surface water and groundwater are presented 

below in Table 1. 

Table 1. Tier I Estimated Drinking Water Concentrations for propamocarb hydrochloride use. 

1 I Lima beans (1.5 lbs. a.i./A/applic. x 4 / I a- , I 

DRINKING WATER SOURCE 

(MODEL USED) 

Groundwater (SCIGROW) 

USE (rate modeled) 

. vr-, 

Surface Water (FIRST) 

MAXIMUM ESTIMATED DRINIUNG 

WATER CONCENTRATION (EDWC) 

I nnhl 

Lima beans (1.5 lbs. a.i./A/applic. x 4 

auulic, 

(SCIGRoW) 

Surface Water (FIRST) 

applic) 

Lima beans (1.5 lbs. a.i./Alapplic, x 4 

annlicl 

Acute and Chronic 

Container-grown ornamental 

(1 28 lbs. a.i./A/applic. x 17 applic ) 

Container-grown ornamental 

(128 lbs. a.i./A/applic. x 17 applic) 

Container-grown ornamental 

(128 lbs. a.i./A/applic. x 17 applic ) 

0.73 

Acute 

Chronic 

LL 1 

17.7 

Acute and Chronic 

Acute 

Chronic 

264 

14,568 

1,157 
This assessment is based on available environmental fate data. There are no significant data gaps in 

the environmental fate database submitted by the registrant. Although data are not available fbr anaerobic 

aquatic metabolism, the anaerobic phase of the anaerobic soil metabolism study indicates that propamocarb 

hydrochloride is stable under such conditions. 

PROBLEM FORMULATION 1 

This is a Tier I drinking water assessment (DWA) that uses modeling and available monibring data to 

estimate the groundwater and surface water concentrations of pesticides in drinking water sourc& water (pretreatment) resulting fiom pesticide use on sites that are vulnerable. Tier I DWAs are designed do screen out 

chemicals with low potential risk for posing a drinking water concern. , 

I 

ANALYSIS 

Use Characterization 

Propamocarb hydrochloride is used to control the plant disease "damping-off' and hais fungicidal 

activity against Pythium spp. and Phytophthora spp. Propamocarb is a systemic fhgicide present y registered 

for the following uses: terrestrial nonfood crops, i.e., ornamental lawns and turf, ornamental sod turf farms), 

and vines, containerized ornamental plants. 

I 

and terrestrial and greenhouse non-food crops, i.e., ornamental herbaceous plants, ornamental wbody shrubs 

Application information for the proposed new use on lirna beans and the existing use on c4ntainerized 

ornamentals is presented in Table 2. The containerized ornamental rate assumes that the ornamdntals can be 

treated annually 17 times. 

Table 2. Summary use information for propamocarb hydrochloride proposed new use and containbr-grown 

ornamentals. I 

(EPA Reg. No. 55260-9) I 

Lima Beans 

Container-grown 

ornamentals 

Environmental Fate and Transport Characterization 

Use 

Based on the available data, propamocarb hydrochloride is characterized as a moderate1 persistent, 

very mobile compound which could be transported to surface water bodies and to ground water. Itis extremely 

soluble in water (700,000 ppm at 25OC) has low volatility and a low adsorption coefficient (Kd $= 0.67 - 5.2 

mllg), and would be transported in a dissolved phase in runoff. 

Max. Single 

Applic. Rate 

(Ibs. a.i./A) 

No, of 

Applic. 

1.5 

128 

Annual Applic. 

Rate 

(Ibs. a.i.IA/y r) 

4 

17 

Interval 

Between 

Applic. (days) 

6.0 

2,176 

Applic. 1 Method 

I 

7 I ~tound spray 

2 1 

I 

I 

G ound spray t 
The main route of dissipation from laboratory studies appears to be aerobic soil metabolism (t% = 12- 

30 days). Photolysis on soil is also a possible route of dissipation for propamocarb hydrochloride on the soil 

surface (t% = 35 days). It is very persistent in soil under anaerobic conditions (t% = 459 days). 

Propamocarb hydrochloride that reaches surface water will degrade slowly, as it is stable to hydrolysis 

and aqueous photolysis. It is also moderately persistent in sediment under anaerdbic conditions (t%= 100 days). 

However, propamocarb hydrochloride does not accumulate in fish at significant levels (BCFs of 1.5X and 3.OX 

for edible and nonedible tissues, respectively). 

Table 3 summarizes the physicochemical properties of propamocarb hydrochloride. A full assessment 

of the environmental fate of propamocarb hydrochloride can be found in the June 26,2000 memo, Section 3 

for propamocarb hydrochloride to control late blight (Phytophthora infestans) on potatoes (DP Barcode 

0259522 and others.) 

Table 3. Physical chemical properties for propamocarb hydrochloride. 

Parameter I Value I MRID I 

Molecular Weight (g/mole) 

Solubility (ppm @ 25°C) 

Vapor Pressure (mm Hg @ 25°C) 

Hydrolysis half-life (days) 

Aquatic photolysis half-life (days) 

I Aerobic soil metabolism half-life (days) 1 12, 13, 13, 14, 14,30 1 41278125 th 41278128 1 

Soil photolysis half-life (days) 

224.7 

700,000 

6.0 x 

Stable @ pH=5,7, and 9 

Stable 

00071297 

0007 1296 

3 5 

Anaerobic soil metabolism half-life (days) 

4 1834608 

Freudlich Soil Partition Coefficient (ml/g) 

(Ka) 

Drinking Water Exposure Modeling 

I I 

459 

Organic Carbon-Normalized Soil Partition 

Coefficient (mL/g,,) (KO,) 

Models 

41278129 

Oh7 tsand) 

0.85 (loamy sand) 

5.2 (sandy loam) 

An Estimated Drinking Water Concentration (EDWC) in groundwater was estimated using EFED's 

Tier I aquatic model SCIGROW (Screening concentration in Ground Water, version 2.3; 8/8/2003). 

SCIGROW is a regression model used as a screening tool to estimate pesticide concentrations found in ground 

water used as drinking water. SCIGROW 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 Ground Water studies; 

the RILP is a function of aerobic soil metabolism and the soil-water partition coefficient. The output of 

SCIGROW represents the concentrations that might be expected in shallow unconfined aquifers under sandy 

41278130 

140 (sand) 

4 1 (loamy sand) 

359 (sandy loam) 

41278130 
soils, which is representative of the ground water most vulnerable to pesticide contamination likqly to serve as 

a drinking water source. (Ref. 1) 

An Estimated Drinking Water Concentration (EDWC) in surface water was estimated uding EFED's 

Tier I aquatic model FIRST (vl. 1 .O; 1/1/07). FIRST (FQPA Index Reservoir Screening Tool) is vetamode1 

of PRZM and EXAMS used as a screening tool to estimate pesticide concentrations found in sprface water 

used as drinking water. FIRST was developed by making multiple runs of PRZM using varying sorption 

coefficients and determining the concentration in the EXAMS index reservoir scenario after a twb-inch single 

storm event. The Index Reservoir is a standard water body used by the Office of Pesticide Programs to assess 

drinking water exposure (Office of Pesticide Programs, 2002). It is based on a real reservoik (albeit not 

currently in active use as a drinking water supply), Shipman City Lake in Illinois, that is Mown to be 

vulnerable to pesticide contamination). The single runoff event moves a maximum of 8% ofl the applied 

pesticide into the reservoir. This amount can be reduced by degradation or effects of binding soil in the 

field. Additionally, FIRST can account for spray drift and adjusts for the area within a wate shed that is 

planted with the modeled crop (Percent Cropped Area). Spray drift (modeled as direct depo ition of the 

pesticide into the reservoir) is assumed to be 16% of the applied active ingredient for aerial appli ation, 6.3% 

for orchard air blast application, and 6.4% for other ground spray application. Despite being a 1 ingle event 

model, FIRST can account for spray drift from multiple applications. The non-agricultural Perc$nt Cropped 

Area (PCA) of 100% was used in the assessment for ornamental use, while a PCA of 87% was psed for the 

lima bean new use. The PRZM scenario used for FIRST development was among the most vul erable, and t thus resulting surface water concentrations represent the upper bound values on the concentratio s that might 

be found in drinking water from the use of a pesticide. (Ref. 2 and 3) 7 

I 

I 

Modeling Approach and Input Parameters I , 

Tier I modeling for the EDWC in surface water and groundwater from propamocarb hydrobhloride use 

on container-grown ornamentals was conducted using the maximum labeled application rate of 128 lbs 

a.i./A/application applied seventeen times a year for a total application rate of 2,176 lb ai/A/yr. 4dditionally, 

Tier I modeling for the EDWC in surface water and groundwater from propamocarb hydrochloridtj new use on 

lirna beans was conducted using the maximum labeled application rate of 1.5 lbs a.i./A/application pplied four 

times a year for a total application rate of 6 lb ai/A/yr. Physicalkhemical properties and enviro mental fate 

source data (from submitted studies) were presented in Table 3. Input values used for surface wat r rriodeling 

presented in Table 5. 

1 

with FIRST are presented in Table 4. Input values used for groundwater modeling with SCI-$~ROW~ are I 

I 

,In running FIRST, the lowest non-sand adsorption coefficient (Kd = 5.2) was used becduse the K, 

model was not valid for propamocarb. In running SCIGROW, however, a KO, value of 41 (lo est derived t value) was used because there was greater than a three-fold variation in the range of KO, values. In running 

FIRST, an aerobic soil metabolism half-life of 20.6 days was used, as it represents the goth perc ntile on the 

mean for 6 available half-lives submitted by the registrants (12, 13, 13, 14, 14 and 30 days). In running 

SCIGROW, an aerobic soil metabolism half-life of 13.5 days was used, as it represents the medi value for 

these six half-lives. 

L I 
Table 4. Input values for the FIRST model for propamocarb hydrochloride. I I 1 

Variable Name 

I Application Rate (lbs. ailacre) 1 128 (ornamental), 1.5 (lima beans) I 

Data Value 

Application Method 

I 

Ground (ornamental use), aerial (lirna beans) 

Aerobic Soil Metabolism I T1, = 20.6 days (90~ percentile on mean of 6 values) 

Application Frequency 

Application Interval (days) 

Solubility 

Hydrolysis 

Photolysis 

17 (ornamental), 4 (lima beans) 

2 1 (ornamental), 7 (lima beans) 

700,000 ppm 

TlIz = stable 

Tl12 = stable 

Aerobic Aquatic Metabolism 

Kd 

TIl2 = 41.2 (2x aerobic soil metabolism) 

5.2 (lowest non-sand value) 

Table 5. Input values for the SCI-GROW model for propamocarb hydrochloride. 

Modeling Results 

Variable Name 

Application Rate (Ibs. ailacre) 

Application Frequency 

Aerobic Soil Metabolism 

KO, 

Tier I surface water and groundwater modeling results for propamocarb hydrochloride for ground 

spray application to container-grown ornamentals and aerial application to lima beans are presented in Table 6. 

These values are recommended for use in the human health risk assessment. Output values for surface water 

are not modified for container grown ornamentals using the percentage crop area (PCA) adjustment factor 

since the value used is 1.0. Output values for surface water are modified for lima beans using the PCA 

adjustment factor of 0.87. Output values for groundwater are not adjusted for a PCA. Additionally, modeling 

results assume that the ornamental containers are placed directly on the soil surface. 

Data Value 

128 (ornamental), 1.5 (lirna beans) 

17 (ornamental), 4 (lima beans) 

Tliz = 13.5 days (median value, as 6 values available) 

4 1 (lowest value; >3-fold variability ) 

Table 6. Tier I Estimated Drinking Water Concentrations based on propamocarb hydrochloride use on 

container-grown ornamentals and lima beans. 

Surface Water (FIRST) 

DRINKING WATER SOURCE 

(MODEL USED) 

Groundwater (SCIGROW) 

Surface Water (FIRST) 

USE (rate modeled) 

Lima beans (1.5 Ibs. a.i./Ailapplic. x 4 

aDDlic, 

MAXIMUM ESTIMATED DRINKING 

WATER CONCENTRATION (EDWC) 

( PP~) 

Lima beans (1.5 lbs. a.i.lA/applic. x 4 

applic) 

Lima beans (1.5 Ibs. a.i.lA/applic. x 4 

applic) 

Acute and Chronic 

A 

applic) 

Lima beans (1.5 Ibs. a.i.lA/applic. x 4 

applic) 

0.73 

Acute 

Chronic 

22 1 

17.7 

ZZ 
The SCIGROW concentration represents the groundwater concentration that might b 

shallow unconfined aquifers under sandy soils. The output is used for both acute and chronic 

DRINKING WATER SOURCE 

(MODEL USED) 

Groundwater (SCIGRoW) 

Surface Water (FIRST) 

FIRST concentrations (ppb) represent untreated surface water concentrations. The one-in-11ear peak 

day concentration is used for acute endpoints and the one-in-1 0-year annual average concentrati n is used for 

chronic endpoints. 4 

The estimated concentrations provided in this assessment are conservative estimates of c ncentrations 

in drinking water. If dietary risks require refinement, higher tiered crop-specific and location-sp cific models 

and modeling scenarios can be used. 

8 

USE (rate modeled) 

Container-grown ornamental 

(128 lbs. a.i./Napplic. x 17 applic ) 

Container-grown ornamental 

(128 Ibs. a.i./Napplic. x=-- 

Container-grown ornamental 

(128 lbs. a.i./Napplic. x 17 applic ) 

Uncertainties and Data Gaps 

This assessment is based on available environmental fate data. There are no 

the environmental fate database submitted by the registrant. Although data are not 

aquatic metabolism, the anaerobic soil metabolism study indicates that propamocarb 

under such conditions. 

(ppb) ) 

Two major sources of uncertainty and conservatism in this assessment include: 

Acute and Chronic 

-- Acute 

Chronic 

1) Output values for surface water and groundwater for container-grown ornamentals were pot adjusted 

using a percentage crop area (PCA) factor. This assumes that for container-grown ornmentals the 

entire 178 ha watershed is treated simultaneously with propamacarb hydrochloride. 

2) Both SCIGROW and FIRST were designed to model EDWCs from treated agriculturb fields. For 

propamocarb hydrochloride, the models have been used to estimate EDWCs from contaipers. Unlike 

an application to crops in soil, containers can provide a barrier that impedes the loss oft pesticide to 

surface water runoff and permeation into the soil underneath the containers. As such, themodels may 

overestimate the EDWCs. 

I 

264 

14,568 

1,157 

References 

1. SCIGROW: Users Manual (1 1/01/2001, revised 08/23/2002) 

2. FIRST Users Manual (08/01/2001) 

3. FIRST: A Screening Model to Estimate Pesticide Concentrations in Drinking Water (0$/01/2001) 

4. Guidance for Selecting Input Parameters in Modeling the Environmental Fate and ~rds~ort of 

Pesticides, Version 11 (02/28/2002) 

5. Use of the Index Reservoir and Percent Crop Area in EFED Drinking Water ~ssessments 

(12/01/1999) 

I 
Appendix A 

Chemical Structure - Propamocarb hydrochloride 
Appendix B 

TIER I SURFACE WATER MODELING OUTPUT FILES I 

RUN No. 1 FOR propamocarb ON ornamental * INPUT VALUES * .................................................................. I- - 

RATE (#/Ac) NO .APPS & SOIL SOLUBIL APPL TYPE %CROPPED INCO~P 

ONE ( MULT) INTERVAL ~d (PPM) (%DRIFT) AREA IN^) .................................................................... 

128.000 (252.621) 17 21 5.2******* GROUND ( 6.4) 100.0 - p 

FIELD AND RESERVOIR HALFLIFE VALUES (DAYS) .................................................................... 

METABOLIC DAYS UNTIL HYDROLYSIS PHOTOLYSIS METABOLIC COMBINFD 

(FIELD) RAIN/RUNOFF (RESERVOIR) (RES.-EFF) (RESER.) (RESERl.) .................................................................. 

20.60 2 N/ A .OO- . 00 41.20 

t41.20 

UNTREATED WATER CONC (MILLIGRAMS/LITER (PPM)) Ver 1.1.0 JAN 1, 2007 

PEAK DAY (ACUTE ) ANNUAL AVERAGE ( CHRONIC) 

CONCENTRATION CONCENTRATION 

RUN No. 2 FOR propamocarb ON ornamental * INPUT VALUES*, .................................................................... 

RATE (#/AC) No-APPS & SOIL SOLUBIL APPL TYPE %CROPPED INCOVP 

ONE (MULT) INTERVAL ~d (PPM) (%DRIFT) AREA (INJ .................................................................. T - 

128.000 (128.000) 1 1 5.2******* GROUND ( 6.4) 100.0 .d I 

FIELD AND RESERVOIR HALFLIFE VALUES (DAYS) ------------------------------------------------------------------*- 

METABOLIC DAYS UNTIL HYDROLYSIS PHOTOLYSIS METABOLIC COMBIN~D 

(FIELD) RAIN/RUNOFF (RESERVOIR) (RES.-EFF) (RESER.) (RESER,) .................................................................... 

20.60 2 N/A .OO- .OO 41.20 41.2d 

UNTREATED WATER CONC (MILLIGRAMS/LITER (PPM)) Ver 1.1.0 JAN 1, 20q7 .................................................................... 

PEAK DAY (ACUTE ) ANNUAL AVERAGE (CHRONIC) 

CONCENTRATION CONCENTRATION .................................................................. 7 - 

7.175 ,566 

RUN No. 3 FOR propamocarb ON lima beans * INPUT VALUES I* 

RATE (#/AC) No.APPS & SOIL SOLUBIL APPL TYPE %CROPPED INCORP 

ONE (MULT) INTERVAL Kd (PPM) ( %DRIFT) AREA IN)^ 
FIELD AND RESERVOIR HALFLIFE VALUES (DAYS) .................................................................... 

METABOLIC DAYS UNTIL HYDROLYSIS PHOTOLYSIS METABOLIC COMBINED 

(FIELD) RAIN/RuNOFF (RESERVOIR) (RES.-EFF) (RESER.) (RESER.) .................................................................... 

20.60 2 N/A .oo- .OO 41.20 41.20 

UNTREATED WATER CONC (MICROGRAMS/LITER (PPB)) Ver 1.1.0 JAN 1, 2007 .................................................................... 

PEAK DAY (ACUTE 1 ANNUAL AVERAGE (CHRONIC) 

CONCENTRATION CONCENTRATION .................................................................... 

214.132 16.928 

RUN No. 4 FOR propamocarb ON lima beans * INPUT VALUES * 

RATE (#/AC) No.APPS & SOIL SOLUBIL APPL TYPE %CROPPED INCORP 

ONE (MULT) INTERVAL Kd (PPM) ( %DRIFT) AREA (IN) 

FIELD AND RESERVOIR HALFLIFE VALUES (DAYS) 

METABOLIC DAYS UNTIL HYDROLYSIS PHOTOLYSIS METABOLIC COMBINED 

(FIELD) RAIN/RUNOFF (RESERVOIR) (RES . -EFF) (RESER. (RESER. 

UNTREATED WATER CONC (MICROGRAMS/LITER (PPB)) Ver 1.1.0 JAN 1, 2007 

PEAK DAY (ACUTE ) ANNUAL AVERAGE ( CHRONIC) 

CONCENTRATION CONCENTRATION 
TIER I GROUND WATER MODELING OUTPUT FILES 

SCI-GROW Output 

SCIGROW 

VERSION 2.3 

ENVIRONMENTAL FATE AND EFFECTS DIVISION 

OFFICE OF PESTICIDE PROGRAMS 

U.S. ENVIRONMENTAL PROTECTION AGENCY 

SCREENING MODEL 

FOR AQUATIC PESTICIDE EXPOSURE 

SciGrow version 2.3 

chemical:Propamocarb 

time is 6/23/2009 10: 4:16 ........................................................................ 

Application Number of Total Use Koc Soil Aerobic 

rate (lb/acre) applications (lb/acre/yr) (ml/g) metabolism (days) ........................................................................ 

128.000 17.0 2176.000 4.10E+01 13.5 ........................................................................ 

groundwater screening cond (ppb) = 2.643+02 ........................................................................ 

SciGrow version 2.3 

chemical:Propamocarb 

time is 6/23/2009 10: 4:26 .................................................................... 

Application Number of Total Use Koc Soil Aerobic 

rate (lb/acre) applications (lb/acre/yr) (ml/g) metabolism (d .................................................................... 

128.000 1.0 128.000 4.10E+01 13.5 .................................................................... 

groundwater screening cond (ppb) = 1.55E+01 .................................................................... 

SciGrow version 2.3 

chemical:Propamocarb 

time is 8/ 7/2009 8:36:12 ........................................................................ 

Application Number of Total Use Koc Soil Aerobic 

rate (lb/acre) applications (lb/acre/yr) (ml/g) metabolism (dqys) 

--------------------------------------------------------------------d--- 

1.500 4.0 6.000 4.10E+01 13.5 --------------------------------------------------------------------J--- 

groundwater screening cond (ppb) = 7.283-01 ........................................................................