U. S. ENVIRONMENTAL PROTECTION AGENCY

Washington, D.C. 20460

OFFICE OF

CHEMICAL SAFETY AND

POLLUTION PREVENTION

PC Code: 128850

DP Barcode: 387412

Date: May 30, 2012

MEMORANDUM

SUBJECT: Refined Drinking Water Assessment for Glufosinate-ammonium Use on Rice

TO: Kathryn Montague, Product Manager

Dan Kenny, Branch Chief

Herbicide Branch

Registration Division (7505P) 

Barbara Madden, Team Leader

Risk Integration Minor Use, and Emergency Response Branch

Registration Division (7505P)

William Donovan, Risk Assessor

Michael Metzger, Branch Chief

Risk Assessment Branch V

Health Effects Division (7509P)

FROM: Chuck Peck, Environmental Engineer

Environmental Risk Branch IV

Environmental Fate and Effects Division (7507P)

REVIEWED Jim Carleton, Ph.D., Senior Scientist

BY: Environmental Risk Branch IV

Environmental Fate and Effects Division (7507P)

APPROVED Meredith Laws, Acting Branch Chief

BY: Environmental Risk Branch IV

Environmental Fate and Effects Division (7507P)
2

Executive Summary

Glufosinate-ammonium (CAS 77182-82-2), an herbicide, is an active ingredient in (1) 

Liberty®280 SL (EPA Reg. No. 264-829), used for broadcast burndown applications prior to 

planting or pre-emergence of rice and for use on glufosinate-tolerant rice, and (2) Liberty®(EPA 

Reg. No. 264-660), used for weed control on Liberty® tolerant rice. A previous refined Tier II 

drinking water assessment (drinking water memo dated October 20, 2010; DP Barcode 381992) 

evaluated applications of glufosinate-ammonium to rice and reported acute and chronic 

estimated drinking water concentrations (EDWCs) of 831 and 615 μg/L, respectively. These 

EDWCs exceeded the chronic drinking water level of concern (75 μg/L, revised in 2012 based 

on updated consumption data in the Dietary Exposure Evaluation Model (DEEM) to 97 μg/L).

Since the publishing of these EDWCs, Bayer Crop Science (BCS) has made revisions to 

the labels and OPP has reevaluated the residues of concern and updated modeling parameters in 

an effort to refine the potential exposure estimates. In May 2012, BCS submitted proposed label 

revisions on the Liberty®and Liberty

®

280 SL labels for burndown and postemergent 

applications to rice and for rice-seed propagation. Analysis of environmental fate data indicated 

incorrect input values had been used in the previous drinking water assessment and, as such, 

these values have been updated (DP Barcode 387412, 09/06/2011). In January 2012, OPP’s 

Health Effects Division’s (HED) Residues of Concern Knowledgebase Subcommittee (ROCKS) 

met to re-evaluate the inclusion of three glufosinate-ammonium degradates [3-

methylphosphinico-propionic acid (MPP, HOE 061517), 2-methylphosphinico-acetic acid 

(MPA, HOE 064619), and 2-acetamido-4-methylphosphinico-butanoic acid (NAG, HOE 

085355/HOE 099730)] into the drinking water assessment, as had been done in previous 

assessments. Based on the recommendation of the ROCKS, only MPP is retained as a degradate 

of concern. Additionally, based on their different modes of action, drinking water estimates for 

MPP and glufosinate-ammonium are derived separately (D397644, 03/29/2012).

The revised Liberty

®

280 SL label allows for a maximum of 79 fl oz product/acre/season 

(1.44 lbs ai/acre/season) to be applied for rice seed propagation to dry fields with a 7-day postapplication holding period for flood waters. This application may be split into two applications 

of approximately 40 fl oz product/acre/season (0.72 lbs ai/acre/season), applied with a 10 to 14-

day retreatment interval (RTI), where the first application is made to a dry field and the second 

application to a flooded field. If this is done, then longer holding periods for the flood water are 

required: 55-days for 4-inch paddy depths and 30-days for 8-inch paddy depths. 

For applications on glufosinate-tolerant rice plants, a maximum of 48 fluid ounces (fl oz)

product/acre/season (0.88 lbs ai/acre/season) is allowed, and a 7-day post-application flood water 

holding period is required. If the maximum single application rate of 0.88 lbs ai/acre is used, 

then the application must be made to dry fields. If the applications is split into two applications

of 24 fl oz product (0.44 lbs ai/acre), with the second application made from 10-14 days after the 

first application, then the applications may be made to either dry or flooded fields. If two 

flooded-field applications of 0.44 lbs ai/acre are made, then the paddy depth must be at least 8 

inches. If the applications are to dry fields, then the paddy depth must be at least 4 inches. A 7-

day post-application holding period of paddy water is required for both dry and flooded-field 

applications. Finally, for burndown applications the Liberty®280 SL label allows a maximum 
3

single application rate of 36 fl oz product/acre (0.66 lbs ai/A), with a 7-day post-application 

holding period for flood waters. 

The application rates for the Liberty®label are similar to those prescribed on the Liberty

®

280 SL label. For rice seed propagation, the Liberty®label allows for a maximum of 112 fl oz 

product/acre/season (1.46 lbs ai/acre/season) to be applied to dry fields with a 7-day postapplication holding period. This application may be split into two applications of 56 fl oz 

product/acre/season (0.73 lbs ai/acre/season), applied with a 10 to 14-day RTI, where the first 

application is made to a dry field and the second application applied to a flooded field, but longer 

holding periods for flood water are incurred: 55-days for 4-inch paddy depths and 30-days for 8-

inch paddy depths. For applications on glufosinate-tolerant rice, a maximum of 68 fl oz 

product/acre/season (0.89 lbs ai/acre/season) can be made, requiring a 7-day post-application 

flood water holding period. If the maximum single application rate of 0.89 lbs ai/acre is used, 

the application must be made to dry fields. If the applications is split into two applications of 34 

fl oz product (0.44 lbs ai/acre), with the second application made from 10-14 days after the first 

application, the applications may be made to dry or flooded fields. If two flooded-field 

applications of 0.44 lbs ai/acre are made, the paddy depth must be at least 8 inches in depth; if 

dry applications are made, a minimum 4-inch paddy depth is required. A 7-day post-application 

holding period of paddy water is required for dry and flooded-field applications. The Liberty

®

label does not allow for burndown applications for rice. 

EFED modeled applications of glufosinate-ammonium to dry and flooded fields as 

specified on the two labels. The scenarios modeled are provided in Table 1. Given regional 

practices in rice production, 4-inch and 8-inch paddies were modeled along with the holding 

periods specified on the labels. 

EFED estimated acute EDWCs for glufosinate-ammonium and MPP using the refined 

Tier I Rice Model and Pesticide Flooded Application Model (PFAM) without the index 

reservoir. Several methods were employed to estimate chronic EDWCs. In the first method, the 

acute concentrations from PFAM without the index reservoir were allowed to degrade over a 

365-day period, using the aerobic aquatic degradation half-lives, and the average concentration 

over the one-year period was calculated. Using this method, chronic values are approximately 

76% and 3% lower than the acute values for glufosinate-ammonium and MPP, respectively. In 

the second method, EFED evaluated monitoring data for other pesticides (molinate, thiobencarb, 

and fipronil) used predominantly for rice growing to assess trends in chronic and acute 

concentrations. These data indicated that long-term average concentrations (chronic) could be 50 

to 90% lower than the peak concentrations (acute). EFED applied these factors to the PFAM 

without-the-index-reservoir acute concentrations to estimate chronic concentrations. Lastly, 

EFED examined the use of PFAM, coupled with the index reservoir, to estimate acute and 

chronic concentrations in a receiving waterbody. Reductions in peak to annual average 

concentrations using PFAM with the index reservoir were in the range of 73-85% and 4-47% for 

glufosinate-ammonium and MPP, respectively. It should be noted that the use of PFAM in 

estimating drinking water concentrations in surface waters from rice paddies is still under 

evaluation. However, as the effluent concentrations derived in PFAM have been through internal 

and external review and evaluation, EFED recommends the use of the acute EDWCs derived 

from PFAM without-the-index-reservoir, and chronic EDWCs derived using aerobic aquatic 
4

degradation kinetics, as conservative estimates for glufosinate-ammonium and MPP in drinking

water. The highest estimates for the use scenarios are provided in Table 1. A full range of 

EDWCs for different uses of glufosinate-ammonium on rice and different areas of the country 

derived using PFAM without-the-index-reservoir is provided in Table 11. It should be noted 

that the highest modeled EDWCs, as reported in Table 1, occurred in California. While rice is 

grown in California, the Liberty

®

280 SL and Liberty®products are currently not registered in 

California and, therefore, are not used for weed control on rice in California.

For glufosinate-ammonium and MPP, flooded applications generated the highest PFAM 

concentrations, followed by the dry application scenarios. This is different than the trend of 

results from the refined Tier I analysis, where the highest single application rate (1.46 lbs ai/A) 

generated the highest acute EDWCs, with all other applications generating similar acute 

EDWCs. The glufosinate-ammonium PFAM concentrations in the flooded applications were 

similar to those obtained with the refined Tier I model, while the dry applications were 

significantly lower (approximately 82%). For MPP, the PFAM concentrations for dry 

applications were significantly lower (approximately 99%), while reductions in the flooded 

applications were comparable to the dry glufosinate-ammonium applications (approximately 

82%). It appears that for glufosinate-ammonium and MPP during flooded applications, the 

majority of the compound remains in the water column after application, resulting in higher 

concentrations than occur following dry applications. A comparison of these PFAM results to 

maximum water column concentrations reported in an aquatic field dissipation (AFD) study for 

glufosinate ammonium, adjusted to a 4-inch paddy depth, indicates that the PFAM 

concentrations were similar to those in the AFD study for glufosinate-ammonium (83 μg/L 

versus 93 μg/L for a dry application and 375 μg/L versus 288 μg/L for a flooded application of 

0.44 lbs ai/A, twice). For MPP, the concentrations were similar for the flooded application (40 

μg/L versus 42 μg/L), but much lower for the dry applications (2.8 μg/L versus 102 μg/).

Table 1.EDWCs for glufosinate-ammonium use on rice derived using PFAM (maximum 

values appear in bold)

Use rate, Number of apps, retreatment interval, 

water holding period, application timing

Acute EDWC 

(μg/L)

Annual Average EDWC1

(μg/L)

4” 8” 4” 8”

Glufosinate-ammonium

1.46 lbs ai/acre, 1, NA, 7 days, dry 173 86 42 21

0.73 lbs ai/acre, 2, 10, 30, dry and flooded2 NA 320 NA 78

0.73 lbs ai/acre, 2, 10, 55, dry and flooded2390 NA 95 NA

0.89 lbs ai/acre, 1, NA, 7 days, dry 106 53 26 13

0.66 lbs ai/acre, 1, NA, 7 days, dry 74 38 18 9

0.44 lbs ai/acre, 2, 10 days, 7 days, dry 88 45 22 11

0.44 lbs ai/acre, 2, 10 days,7 days, flooded NA 375 NA 92

MPP

1.46 lbs ai/acre, 1, NA, 7 days, dry 5.7 2.9 5.5 2.8

0.73 lbs ai/acre, 2, 10, 30, dry and flooded2 NA 88 NA 85

0.73 lbs ai/acre, 2, 10, 55, dry and flooded2183 NA 177 NA

0.89 lbs ai/acre, 1, NA, 7 days, dry 3.5 1.8 3.4 1.7

0.66 lbs ai/acre, 1, NA, 7 days, dry 2.2 1.1 2.1 1.1

0.44 lbs ai/acre, 2, 10 days, 7 days, dry 3.0 1.5 2.9 1.5

0.44 lbs ai/acre, 2, 10 days,7 days, flooded NA 45 NA 44
5

1. Annual average EDWC calculated by taking acute EDWC and allowing it to degrade for 365 days, using the aerobic 

aquatic degradation half-life, and then taking the average value over the 365-day period.

2. For this scenario the first application is made to a dry field, while the second application is made to a flooded field.

NA – not allowed.

1. Background and Purpose of this Drinking Water Assessment

Glufosinate-ammonium (CAS 77182-82-2) is an active ingredient in Liberty®280 SL

(EPA Reg. No. 264-829) and Liberty

®

(EPA Reg. No. 264-660). Among their many uses, both 

products can be used for control of weeds in rice. Glufosinate-ammonium is a nonselective 

herbicide that is applied post-emergent to weeds and pre-emergent to rice that is not genetically 

modified to be tolerant to glufosinate-ammonium, or post-emergent to rice that is genetically 

modified to be tolerant to glufosinate-ammonium. A previous refined Tier II drinking water 

assessment (DP Barcode 381992, October 20, 2010) evaluated applications of glufosinateammonium to rice and reported acute and chronic estimated surface water concentrations of 

total toxic residues of 831 and 615 μg/L, respectively. These EDWCs exceeded the chronic 

drinking water level of concern (75 μg/L, revised in 2012 based on updated consumption data in 

the Dietary Exposure Evaluation Model (DEEM) to 97 μg/L). In response to this drinking water 

assessment, Bayer Crop Science (BCS) submitted label revisions to the Liberty

®

280 SL and 

Liberty®labels. BCS also provided information to update the organic-carbon normalized 

distribution coefficients (KOCs) used in the previous assessment. OPP also reconsidered the 

inclusion of three glufosinate-ammonium degradates [3-methylphosphinico-propionic acid 

(MPP, HOE 061517), 2-methylphosphinico-acetic acid (MPA, HOE 064619), and 2-acetamido4-methylphosphinico-butanoic acid (NAG, HOE 085355/HOE 099730)] in its assessment. 

Based on a re-evaluation by HED’s ROCKS, only glufosinate-ammonium and its degradate MPP 

are considered residues of concern and, because of their different modes of action, should be 

assessed separately (D397644, 03/29/2012). As a result of these revisions to the label, fate 

parameters, and residues of concern, a revised drinking water assessment was conducted.

2. Use Characterization

The revised Liberty

®

280 SL label allows for a maximum of 79 fl oz product/acre/season 

(1.44 lbs ai/acre/season) to be applied for rice seed propagation to dry fields with a 7-day postapplication holding period for flood waters. This application may be split into two applications 

of approximately 40 fl oz product/acre/season (0.72 lbs ai/acre/season), applied with a 10 to 14-

day retreatment interval (RTI), where the first application is made to a dry field and the second 

application to a flooded field. If this is done, then longer holding periods for the flood water are 

required: 55-days for 4-inch paddy depths and 30-days for 8-inch paddy depths. 

For applications on glufosinate-tolerant rice plants, a maximum of 48 fluid ounces (fl oz) 

product/acre/season (0.88 lbs ai/acre/season) is allowed, and a 7-day post-application flood water 

holding period is required. If the maximum single application rate of 0.88 lbs ai/acre is used, 

then the application must be made to dry fields. If the applications is split into two applications 

of 24 fl oz product (0.44 lbs ai/acre), with the second application made from 10-14 days after the 

first application, then the applications may be made to either dry or flooded fields. If two 

flooded-field applications of 0.44 lbs ai/acre are made, then the paddy depth must be at least 8 

inches. If the applications are to dry fields, then the paddy depth must be at least 4 inches. A 7-

day post-application holding period of paddy water is required for both dry and flooded-field 
6

applications. Finally, for burndown applications the Liberty®280 SL label allows a maximum 

single application rate of 36 fl oz product/acre (0.66 lbs ai/A), with a 7-day post-application 

holding period for flood waters. 

The application rates for the Liberty®label are similar to those prescribed on the Liberty

®

280 SL label. For rice seed propagation, the Liberty®label allows for a maximum of 112 fl oz 

product/acre/season (1.46 lbs ai/acre/season) to be applied to dry fields with a 7-day postapplication holding period. This application may be split into two applications of 56 fl oz 

product/acre/season (0.73 lbs ai/acre/season), applied with a 10 to 14-day RTI, where the first 

application is made to a dry field and the second application applied to a flooded field, but longer 

holding periods for flood water are incurred: 55-days for 4-inch paddy depths and 30-days for 8-

inch paddy depths. For applications on glufosinate-tolerant rice, a maximum of 68 fl oz 

product/acre/season (0.89 lbs ai/acre/season) can be made, requiring a 7-day post-application 

flood water holding period. If the maximum single application rate of 0.89 lbs ai/acre is used, 

the application must be made to dry fields. If the applications is split into two applications of 34 

fl oz product (0.44 lbs ai/acre), with the second application made from 10-14 days after the first

application, the applications may be made to dry or flooded fields. If two flooded-field 

applications of 0.44 lbs ai/acre are made, the paddy depth must be at least 8 inches in depth; if 

dry applications are made, a minimum 4-inch paddy depth is required. A 7-day post-application 

holding period of paddy water is required for dry and flooded-field applications. The Liberty

®

label does not allow for burndown applications for rice. 

Table 2 summarizes the uses on the proposed labels.

Table 2. Labeled uses for glufosinate-ammonium on rice

Use

Maximum 

Application 

Rate (lbs 

ai/acre)

Number of 

Applications

Minimum

Retreatment 

Interval

Minimum

paddy depth 

(inches)

Flooded or dry 

field

Minimum

Water 

Holding 

Period 

(days)

Liberty®280 SL

Rice Seed

1.44 1 NA 4 Dry 7

0.73 2 10 4

1

st app dry,

2

nd app flooded 55

0.73 2 10 8

1

st app dry,

2

nd app flooded 30

Glufosinatetolerant

Rice

0.88 1 NA 4 Dry 7

0.44 2 10 4 Dry 7

0.44 2 10 8 Flooded 7

Burndown 0.66 1 NA 4 Dry 7

Liberty®

Rice Seed

1.46 1 NA 4 Dry 7

0.73 2 10 4

1

st app dry,

2

nd app flooded 55

0.73 2 10 8

1

st app dry,

2

nd app flooded 30

Glufosinatetolerant

Rice

0.89 1 NA 4 Dry 7

0.44 2 10 4 Dry 7
7

Use

Maximum 

Application 

Rate (lbs 

ai/acre)

Number of 

Applications

Minimum

Retreatment 

Interval

Minimum

paddy depth 

(inches)

Flooded or dry 

field

Minimum

Water 

Holding 

Period 

(days)

Rice Seed 0.44 2 10 8 Flooded 7

Glufosinate-ammonium use in conjunction with rice production is limited, with less than 

500 lbs used on rice between 2007 and 2010 (USEPA, 2011). Data on the amount of use of 

glufosinate-ammonium on tolerant rice are not readily available. It should be noted, though, that 

usage of glufosinate-ammonium on rice can be inferred based on the planting of rice that is 

tolerant to glufosinate-ammonium (e.g., Liberty Link Rice). According to the available public 

information, only two liberty link rice lines, LL62®and LL06®, have been released for planting. 

Because of concerns in the European Union and other foreign markets resulting from

contamination of conventional rice with genetically engineered rice, detected in shipments in 

2006, growing genetically engineered rice has not become economically popular (Lemaux, date 

unknown). As such, one could infer that if farmers are not growing glufosinate-tolerant rice, 

then use of glufosinate-ammonium on glufosinate-tolerant rice plants, or use for propagation of 

glufosinate-tolerant rice seed is also unlikely. Data on the amount of use of glufosinateammonium as a burndown treatment are not available. 

3. Environmental Fate 

A complete summary of the environmental fate of glufosinate-ammonium may be found 

in Table 3. Glufosinate-ammonium is stable to hydrolysis and aqueous photolysis, and degrades 

slowly in anaerobic aquatic environments (half-life of 415 days) (MRIDs 40345656, 41323115, 

46258601). Primary routes of degradation for glufosinate-ammonium are soil photolysis (halflife = 17 days), aerobic soil metabolism (half-lives ranging from 8.5 to 23 days) and aerobic 

aquatic metabolism (half-lives ranging from 1 to 87 days) (MRIDs 41920102, 41323119, 

40345659A, 40345660, and 45204402/01). Glufosinate-ammonium is mobile in sand (organic 

carbon-normalized soil partition coefficient, Koc, = 16.5 L/kgoc) and moderately mobile in silt 

loam soils (Kocs of 268 and 605 L/kgoc) according to the FAO classification system (FAO, 2000; 

MRID 40345662/48394101). Koc values are somewhat less variable than Kd values for

glufosinate-ammonium, as the coefficient of variation (CV) across the three soils for the organic 

carbon partition coefficient (99.7%) is less than that for the soil-water partition coefficient 

(116%). Therefore, the Koc model is more appropriate for glufosinate-ammonium. In several 

terrestrial field dissipation (TFD) studies, glufosinate-ammonium dissipated from the upper six 

inches of soil with half-lives of 1-2 weeks (MRIDs 43110402, 43766915, 43766916, 47542601). 

This range of dissipation rates is generally consistent with those expected from the submitted fate 

and transport studies. In terrestrial field dissipation studies, glufosinate-ammonium did not leach

further than six inches in loam or clay soils or further than 24 inches in a sand soil. Major 

degradates (e.g., those that made up ≥10% applied parent equivalents) of glufosinate-ammonium 

include 3-methylphosphinico-propionic acid (MPP, HOE 061517), 2-methylphosphinico-acetic 

acid (MPA, HOE 064619), and 2-acetamido-4-methylphosphinico-butanoic acid (NAG, HOE 

085355). Based on findings by HED’s ROCKS, only the parent and MPP are considered in this 

assessment (D397644, 03/29/2012).
8

An aquatic field dissipation (AFD) study (MRID 45204403) was conducted to simulate 

applications to rice. Two applications of 0.45 lb ai/A of glufosinate-ammonium were made to 

bare ground in Louisiana in late August followed by flooding and holding of the water for 60 

days. Additionally, two applications of 0.45 lb ai/A of glufosinate-ammonium were made to a 

flooded, non-cropped field in California in late August. At both sites, the first application was 

made at a time corresponding to the 2- to 4-leaf stage of rice (typically 14-28 days after planting) 

and the second application was made 14 days later, corresponding to the 2- to 3-tiller stage. At 

both test sites, applications were made using broadcast ground equipment. In Louisiana, the plot 

was flooded within 24 hours of the second application. In California, the plot was flooded prior 

to the first application and both applications were made to the water. At both test sites, the plots 

were maintained under static water conditions after flooding and the water depth was maintained 

by addition of water as necessary to a depth of 12 inches. It should be noted that this depth is 

greater than depths reported in the crop profiles for California (4-8 inches; Hill, 1997) and 

Louisiana (4 inches; Ship, 2002). Measured concentrations in these studies are expected to be 

lower than what would occur in water bodies with smaller depths. Plots were drained 60 days 

after the second application in Louisiana and 90 days after the second application in California. 

At the Louisiana site, the maximum concentration of glufosinate-ammonium in the flood water 

was 31 μg/L (Day 4). In California, the maximum concentration of glufosinate-ammonium in 

the flood water was 96 μg/L (Day 0). If these concentrations were adjusted for a 4-inch paddy 

depth, the maximum glufosinate-ammonium concentrations in the water would be 93 μg/L (LA) 

and 288 μg/L (CA).

Based on comments from the registrant (MRID 48394101), the Kocs previously used by

EFED were based on organic matter and not organic carbon content. The values used in this 

assessment and presented in Tables 3 and 4 have been corrected by taking the previous values 

and multiplying by 1.72, an assumed, standard correction factor for organic matter to organic 

carbon conversion, as used in OPPTS Guideline 835.1230.

Table 3. Physical/chemical properties and environmental fate data for glufosinateammonium.

Property Value Source Comments

Chemical Name Ammonium-(2RS)-2-amino-4-

(methylphosphinato)butyric acid – –

Molecular Weight (g/mol) 198.2 – –

Solubility in Water (mg/L, 20°C) 1.37x106 MRID 

00263025 –

Vapor Pressure (torr, 25°C) <7.5x10-9 MRID 

44032901 –

Henry’s Law Constant 

(atm-m

3

/mole) 1.43 x 10-12

–

Estimated using 

vapor pressure, 

molecular weight 

and solubility.

Hydrolysis Half-life (25°C) (days) No significant degradation at pH 

5, 7, and 9

MRID 

40345656 –

Aqueous Photolysis Half-life (@ pH 

7 (days) No significant degradation MRID 

41323115 –

Soil Photolysis Half-life (days) 17 MRID 

41920102 –
9

Property Value Source Comments

Aerobic Soil Metabolism Half-life 

(days)

8.5 (sandy loam)

8.7 (silt loam)

8.8 (loamy sand)

MRID 

41323119

1.62 ppm applied

20.6 (sandy loam)

21.4 (silt loam)

23.0 (sandy loam)

MRID 

40345659A 7.23 ppm applied

Aerobic Aquatic Metabolism Halflife (days)

38 (sand)

57 (silt loam)

MRID

40345660 8.3 ppm applied

11 (loam)

87 (sand) MRID

45204402/01

1 ppm applied

1 (sand) 0.1 ppm applied

Anaerobic Aquatic Metabolism 

Half-life (days) 415 MRID 

46258601 –

Organic Carbon-Normalized Soil 

Partition Coefficient (mL/goc) (Koc)

16.5 (sand)

268 (silt loam)

605 (silt loam)

MRID 

40345662/

483941011

--

Terrestrial field dissipation halflives (days) 

8 (cropped plot) MRID 

43110402

–

16.5 (cropped plot)

15.1 (bare ground)

MRID 

43766915

10.3 (cropped plot)

10.6 (bare ground)

MRID 

43766916

14 (grapes) MRID 

47542601

Aquatic field dissipation half-lives 

(days)

<7 (soil, 1st application, LA)

12 (soil, 2nd application, LA)

3 (water, 1st and 2nd applications, 

CA)

MRID 

45204403 –

1. Based on comments from the registrant (MRID 483941-01), the Kocs previously used by EFED were based on 

organic matter and not organic carbon content. The values reported in this table have been corrected by taking 

the old values and multiplying by 1.72.

Available environmental fate data for MPP, estimated from registrant submitted studies 

and EPISuite, are provided in Table 4. Based on aerobic soil metabolism studies for glufosinateammonium (MRID 41323119) and MPP (MRID 41323118), MPP degrades in soil at 

approximately the same rate as glufosinate-ammonium, with half-lives ranging from 6.5 to 23 

days. Degradation in aerobic aquatic environments for MPP was estimated from a study 

submitted for glufosinate-ammonium (MRID 45204402/01), indicating that MPP is persistent in 

water with a half-life ranging from 441 to 2,054 days. It should be noted that there is significant 

uncertainty surrounding the degradation of MPP in water, as the study was not actually 

conducted by applying MPP and the half-life developed for the sand system applied with 1 ppm 

glufosinate-ammonium was based on four data points. MPP has roughly the same mobility as 

glufosinate-ammonium, with a Koc < 17 L/kgoc in sand and Kocs of 145 and 272 L/kgoc in silt 

loam soils (MRID 40345662/48394101). Like for glufosinate-ammonium, Koc values for MPP

are somewhat less variable than Kd values, as the CV across the three soils for the organic carbon 

partition coefficient (88.2%) is less than that for the soil-water partition coefficient (102%). 

Therefore the Koc model is more appropriate for MPP. In a TFD study (MRID 43110402) 

conducted in a Florida citrus orchard, residues of MPP were detected at depths up to 36 inches. 

Two other TFD studies (MRIDs 43766915 and 43766916), conducted on transgenic corn and 

soybeans, indicated MPP was less mobile, restricted to the top 6 inches of the soil. A fourth 
10

TFD study (MRID 47542601), where glufosinate-ammonium was applied to grapes, indicated 

MPP was not detected below 18 inches. Estimated dissipation half-lives for MPP ranged from 

33 to 169 days in the TFD studies. Again, it should be noted that there is significant uncertainty 

surrounding these half-lives, as the studies were not conducted using applied MPP, but with 

applied glufosinate-ammonium, some of which degraded to MPP. In the AFD study (MRID 

45204403) conducted at the Louisiana site, the maximum concentration of MPP in flood water 

was 34 μg/L (Day 14, 110% of maximum glufosinate-ammonium concentration). In the 

California AFD study, the maximum concentration of MPP in flood water was 14 μg/L (Day 4, 

15% of maximum glufosinate-ammonium concentration). If these concentrations were adjusted 

for a 4-inch paddy depth, the maximum MPP concentrations in the water would be 102 μg/L

(LA) and 42 μg/L (CA).

Table 4. Physical/chemical properties and environmental fate data for MPP.

Property Value Source Comments

Chemical Name 3-methylphosphinico-propionic 

acid – –

Molecular Weight (g/mol) 152.09 – –

Solubility in Water (mg/L, 

20°C) 1x106 EPISuite –

Vapor Pressure (torr, 25°C) 1.27x10-5 EPISuite –

Henry’s Law Constant 

(atm-m

3

/mole) 2.54 x 10-12

–

Estimated using vapor 

pressure, molecular 

weight and solubility.

Aerobic Soil Metabolism Halflife (days)

6.5 (sandy loam) MRID 

41323118

0.5 ppm MPP1applied

18.6 (sandy loam) 1.0 ppm MPP1applied

19.8 (sandy loam)

23.2 (silt loam)

21.1 (sandy loam)

MRID 

41323119

4 1.62 ppm GA1

applied

Aerobic Aquatic Metabolism 

Half-life (days)

2,054 (sand) MRID

45204402/014

1 ppm GA1applied

441 (sand) 0.1 ppm GA1applied

Organic Carbon-Normalized 

Soil Partition Coefficient 

(mL/goc) (Koc)

<17 (sand)

145 (silt loam)

272 (silt loam)

MRID 

40345662/

483941012

--

Terrestrial field dissipation 

half-lives (days) 

68 (cropped plot) MRID 

431104024

--

169 (cropped plot)

95 (bare ground)

MRID 

43766915

4

33 (cropped plot)

67 (bare ground)

MRID 

437669164

34 (grapes) MRID 

475426014

Aquatic field dissipation halflives (days)

16 (soil, 2nd application, LA)3

9.4 (water, 1st and 2nd 

applications, CA)

MRID 

452044034 –

1. MPP – 3-methylphosphinico-propionic acid. GA – glufosinate-ammonium.

2. Based on comments from the registrant (MRID 483941-01), the Kocs previously used by EFED were based on 

organic matter and not organic carbon content. The values reported in this table have been corrected by taking 

the old values and multiplying by 1.72.

3. Insufficient data to estimate soil half-life after 1st application.

4. Half-lives based on studies conducted using glufosinate ammonium.
11

4. Relevant Rice Growing Practices

Greater than 85% of the rice production in the United States occurs in Arkansas, 

California, Mississippi, Louisiana, and Texas. Rice has also been grown in Florida, Missouri, 

Oklahoma, and Tennessee 1. Survey data from the National Agricultural Statistics Service 

(NASS) on rice acres planted in the United States for the year 2010 are provided in Table 5. 

Table 5. Summary of acres planted with rice in 20101

State Acreage Planted 

(x 1000) Percent Production(cwt) Percent

Arkansas 1,791 49% 115,675,000 48%

California 558 15% 44,326,000 18%

Louisiana 540 15% 32,625,000 13%

Mississippi 305 8.4% 20,756,000 8.5%

Missouri 253 7.0% 16,254,000 6.7%

Texas 189 5.2% 13,468,000 5.5%

United States 3,636 243,014,000

1 Based on survey data from the from the Quick Stats Database of the National Agricultural Statistics 

Service available at http://quickstats.nass.usda.gov/results/6432EC45-FA6F-3DE6-A48F-98F1917AAEA8.

In general, rice fields are prepared (disking and harrowing) prior to seeding in order to 

destroy winter vegetation and reduce the chance of seedling drift. The fields are then leveled in 

order to maintain a flood and reduce runoff. After land preparation, rice seeds are planted via 

water-seeding or dry-seeding on well prepared seed beds. If dry-seeded, the fields are then 

flushed with irrigation water to obtain a uniform seed germination and seedling emergence. In

between planting and establishment of permanent flood (3 to 4 weeks after the seeding), fields 

may be flushed several times to maintain moisture in the soil. Once the permanent flood is 

established, it is maintained until 2 to 3 weeks before harvesting. Flooded water is released and 

fields are drained 2 to 3 weeks before harvesting to facilitate harvesting operations that use

machines.

In California (Hill et al., 1998), rice is grown primarily in continuously flooded, flowthrough systems, where the rice is seeded by airplane into the water. However, the practice of 

dry seeding of rice in California has increased due to weed resistance issues (Hill et al., 2006). 

Weed control begins within days of planting and continues until the canopy closes over. Flooded 

paddies are normally drained 2-3 weeks prior to harvest. Information from the University of 

California Rice Research and Information Program 

(http://www.plantsciences.ucdavis.edu/uccerice/rice_production/planting_water_mgmt.htm) 

states that paddy water depths typically range from four to greater than eight inches. 

In the southeastern United States, rice can be planted via water-seeding, drill-seeded, or 

broadcast dry; however, most of the planting is via water-seeding to control red rice. In dry seed 

planting, 4-6 weeks may elapse between planting and permanent flood establishment, although

 

1 Based on 2007 census data from the Quick Stats Database of the National Agricultural Statistics Service available 

at http://quickstats.nass.usda.gov.
12

flooding fields immediately after seeding can improve weed control. A uniform flood depth of 

less than four inches (1-2 inches is preferred) is usually maintained prior to rice emergence, and 

then the flood depth is increased to four inches (Shipp, 2002).

Typical planting and harvesting periods were collected from the USDA (2010) and are 

provided in Table 6 below.

Table 6. Typical planting and harvesting dates*

State Planting Harvesting

Arkansas April 14 – May 1 Sep 9 – Oct 10

California May 1 - 25 Sep 15 – Nov 1

Louisiana March 28 – May 1 Aug 4 – Sep 15

Texas March 23 – April 26 Aug 7 – Sep 4

Mississippi April 18 – May 16 Sep 5 – Oct 6

* Data from USDA (2010)

5. Modeling

The refined Tier I Rice Model and PFAM were used to estimate pesticide concentrations 

in rice paddy effluent. These estimated concentrations result in conservative estimates of 

drinking water concentrations and reflect possible concentrations that may occur when a drinking 

water intake is near the location where paddy water is released, and mixing with uncontaminated 

water is minimal. While the Tier I Rice Model output has been shown to generate concentrations 

that are similar to measured concentrations in paddy waters, and is conservative when compared 

with surface water concentrations downstream of paddy discharges, monitoring data are not 

available to support estimation of chronic exposures. It is likely that long-term mean 

concentrations that do not account for dilution will not be representative of chronic drinking 

water concentrations, because release of paddy water into surface water will not be continuous 

but instead will occur during specific times of the year, such that water used as a source of 

drinking water is not continuously influenced by rice paddy effluent (USEPA, 2007). 

This assessment attempts to estimate glufosinate-ammonium and MPP chronic drinking 

water concentrations by exploring several techniques to account for residue dissipation. The first 

method applies the aerobic aquatic metabolism decay rates of glufosinate-ammonium and MPP 

to the acute concentration, to account for degradation over a 365-day period, and then averages 

the concentrations over this period to estimate an annual average concentration (Sections 5.1 and 

5.2). The second method uses monitoring data for various other pesticides that are applied 

primarily to rice, in order to estimate typical percent reductions in going from acute to chronic 

concentrations (Section 5.3). Lastly, an analysis of Safe Drinking Water Information System 

(SDWIS) data confirms that reservoirs and lakes in rice growing areas are commonly used as 

community drinking water supplies (Appendix A). Thus the third technique investigates 

dilution as well as degradation of paddy effluent (i.e. PFAM results) that discharges into an 

index reservoir (the standard water body EFED uses for surface water source drinking water 

assessments) to characterize chronic concentrations (Section 5.4). 
13

5.1. Refined Tier I Rice Model

The EFED Tier 1 Rice Model (v1.0, May 8, 2007) was used to estimate aquatic 

exposures for applications directly to water. The model estimates exposure in a water body

holding a 10 cm water depth. When a pesticide is applied to a water body, the model assumes 

that it will instantaneously partition between a water phase and a sediment phase based on the 

partition coefficient of the chemical. The formula of the Tier I Rice Model v1.0 is as follows:

d

ai

w

K

m

C

0.00105 0.00013

'





and, if appropriate:

Kd = 0.01Koc

where

Cw water concentration (μg/L)

mai’ mass applied per unit area (kg/ha)

Kd water-sediment partitioning coefficient (L/kg)

Koc organic carbon partitioning coefficient (L/kg)

The Tier I Rice Model was calibrated to generate estimates that are similar to or greater 

than dissolved concentrations measured within rice paddies and in discharged paddy water. The 

calibration involved determination of the sediment interaction depth by calibrating the model to 

exceed residues measured in paddy water in the vast majority of dissipation studies. The model 

does not account for pesticide degradation, volatilization, dilution, or other dissipation processes. 

The model was not evaluated or calibrated for concentrations measured in sediment. Guidance 

for using the Tier I Rice Model may be found on the U.S. Environmental Protection Agency 

(EPA) Water Models web-page (USEPA, 2007).

In the previous drinking water assessment (DP Barcode 381992, October 20, 2010), 

provisional refinements were made to EFED’s Tier I Rice Model to incorporate aerobic soil and 

aerobic aquatic degradation into the equations discussed above. Additionally, instead of 

considering one application, the equation was modified to allow for multiple applications and 

degradation over time. The following equation was used to estimate the amount of mass in the 

paddy as a function of time:

M t  M o  exp k  t

where

M(t) mass in paddy per area of paddy at time t (kg/ha)

Mo initial mass per area of paddy applied to paddy (kg/ha)

t time (days)

k aerobic soil or aquatic metabolism rate constant (days

-1

), depending on 

application timing

If the pesticide is applied prior to flooding, the aerobic soil rate constant would be used in the 

mass equation. Once flooding occurred, the aerobic aquatic metabolism rate constant is used.
14

The concentrations in the paddy water were then estimated using the following equation:

















































   

 

1

2

( ) ( )

CF

K

d d

CF EEC t M t

d

w sed  

where

EEC(t) concentration in paddy water at time t (μg/L)

CF2 conversion factor (1x109μg/kg / 1x104 m

2

/ha / 1x103L/m

3

= 100)

dw water column depth (0.1016 and 0.2032 m in this assessment)

dsed sediment depth (0.01 m)

θ sediment porosity (0.509 unitless)

ρ sediment bulk density (1300 kg/m3)

Kd water-sediment distribution coefficient (L/kg)

CF1 conversion factor (1000 L/m3)

In this assessment instead of the 0.00105 in the denominator (Tier I Rice model), a value 

of 0.0010669 was used to represent a four inch depth and a value of 0.0020829 was used for the 

eight inch depth (Tier I refined Rice Model). As the prior assessment was conducted considering 

the total toxic residue, aerobic soil and aerobic aquatic half-lives were estimated for the 

combined glufosinate-ammonium, MPP, MPA, and NAG residues observed in fate studies. In

this assessment, glufosinate-ammonium and MPP were the only modeled residues of concern 

and they were modeled separately. For glufosinate-ammonium, a Koc of 297 L/kgoc was used in 

the modeling (average of the three reported values). The 90th percentile upper confidence bound 

on the mean of six aerobic soil metabolism and five aquatic half-life rates for residues of 

glufosinate-ammonium (19 days (k = 0.0356 days

-1

) and 63 days (k = 0.0111 days

-1

), 

respectively) were used in modeling. 

For MPP, a Koc of 145 L/kgoc was used in the modeling (average of the three reported 

values). The 90th percentile upper confidence bound on the mean of five aerobic soil metabolism 

and two aquatic half-life rates for residues of MPP (22 days (k = 0.0315 days

-1

) and 3,730 days 

(k = 0.0002 days

-1

), respectively) were used in modeling. For MPP, application rates were 

adjusted by a factor of 0.77 to account for differences in molecular weight (152/198 = 0.77). For 

Tier I modeling, the glufosinate-ammonium was assumed to instantaneously convert to MPP. 

This has the effect of generating conservative estimates for MPP, as the model does not account 

for the gradual formation and decline of MPP, but rather assumes it is present at day 1.

For all dry applications, flooding occurred 24 hours after the last application. Release of 

the permanent flood waters from the fields was assumed to begin 7 days after the last 

application. For flooded-field applications, release of the permanent flood waters from the fields 

was assumed to begin 7 days after the last application. Results from the refined Tier I Rice 

Model are shown in Table 7. For all applications, the acute concentration of glufosinateammonium is slightly higher than those for MPP. Chronic values are approximately 76% and 

3% lower than the acute values for glufosinate-ammonium and MPP, respectively. 
15

Table 7. EDWCs using the refined Tier I rice model.

Use rate, Number of apps, retreatment interval, water holding 

period1, application timing

Acute EDWC in 

μg/L

Annual Average 

EDWC in μg/L

4” 8” 4” 8”

Glufosinate-ammonium

1.46 lbs ai/acre, 1, NA, 7 days, dry2,3 1,006 592 246 145

0.73 lbs ai/acre, 2, 10 days, 30 days, 1st app dry and 2nd app flooded NA 431 NA 105

0.73 lbs ai/acre, 2, 10 days, 55 days, 1st app dry and 2nd app flooded 555 NA 136 NA

0.89 lbs ai/acre, 1, NA, 7 days, dry2,3 613 361 150 88

0.66 lbs ai/acre, 1, NA, 7 days, dry2,3 455 268 111 66

0.44 lbs ai/acre, 2, 10 days, 7 days, dry2,3 516 303 126 74

0.44 lbs ai/acre, 2, 10 days,7 days, flooded4 NA 350 NA 94

MPP5

1.46 lbs ai/acre, 1, NA, 7 days, dry2,3 969 536 937 518

0.73 lbs ai/acre, 2, 10 days, 30 days, 1st app dry and 2nd app flooded NA 510 NA 493

0.73 lbs ai/acre, 2, 10 days, 55 days, 1st app dry and 2nd app flooded 918 NA 888 NA

0.89 lbs ai/acre, 1, NA, 7 days, dry2,3 591 327 571 316

0.66 lbs ai/acre, 1, NA, 7 days, dry2,3 438 242 424 234

0.44 lbs ai/acre, 2, 10 days, 7 days, dry2,3 505 279 488 270

0.44 lbs ai/acre, 2, 10 days,7 days, flooded4 NA 333 NA 322

1 The water holding period is the period water is held from the date of the last application.

2 For dry applications, the field was flooded 24-hours after the last application.

3 Release modeled 7 days after flooding.

4 Release modeled 7 days after last application. 

5 Assumes 77% conversion of glufosinate-ammonium to MPP, based on an adjustment for molecular weight 

(152/198).

5.2. Pesticides in Flooded Applications Model (PFAM)

PFAM version 0.70 was developed as a flooded agriculture model for use in pesticide 

regulatory work. This model has been developed under USEPA Guidance (USEPA, 2009c). 

External independent evaluations have been positive (Luo, 2011). As this model is under 

evaluation, it is still considered provisional. PFAM is conceptualized in Figure 1 and includes 

both hydrological processes and chemical processes. The water body depth may change due to 

precipitation, refill, drainage, evaporation, and weir-height changes. The model consists of two 

regions—a water column and a benthic region. Each individual region is completely mixed and 

at equilibrium with all phases within the individual region, and equilibrium within each region 

follows a linear isotherm (USEPA, 2004). The two regions are coupled by a first-order masstransfer process. Equations for chemical processes (i.e., hydrolysis, bacterial metabolism, 

photolysis, and sorption) within each region are similar to USEPA, 2004. The model accounts 

for plant growth, metabolism, hydrolysis, photolysis, and metabolism in water, sediment, and 

soil (when no water is present), sorption, and volatilization. Water, sediment, and pesticide may 

flow out of the field. Changes in water body conditions (temperature, water levels, wind speed, 

etc.) and the resulting changes in degradation rates occur on a daily time step. Pesticide 

application and flooding sequences are mapped onto the time series in 1-year cycles for the 

length of the simulation. For instance, a typical exposure assessment assumes the pesticide is 

used every year for 30 years (the length of most EFED meteorological files). Output is delivered 

as released mass of pesticide as well as a daily time series of concentrations.
16

Figure 1. Conceptual model of hydrological and chemical processes in PFAM.

PFAM requires the entry of specific dates of applications, emergence, and flooding 

events. Using regional-specific data provided in Table 8, PFAM-required dates were developed 

for the various modeling scenarios as shown in Table 9. The midpoint of the planting dates in 

Table 6 was used in the modeling to estimate emergence dates. Emergence generally occurs 5-

20 days after planting (University of Arkansas, 2006), so, for this assessment, emergence dates 

were assumed to occur 10 days after planting. The midpoint of the harvesting dates in Table 6

was used in the modeling to estimate the Days from Zero Height to Full Height input on PFAM’s 

Crop tab. It was assumed that paddies are drained at least 21 days prior to harvesting (Hill, et 

al., 1997). The Days from Zero Height to Full Height were estimated as the difference between 

the release date (harvest date minus 21 days) and the emergence date. For single, dry

applications, pesticides were applied one day prior to flooding. For burndown applications, 

pesticides were applied one day prior to planting followed by flooding one day later. For dry, 

tolerant rice applications, the first application occurred 10 days after planting (assumed 

emergence period), with the second application occurring 10 days later. Flooding occurred one

day after the second application. For the wet, tolerant rice applications (2 x 0.44 lbs ai/A), 

flooding occurred one day prior to planting, with applications beginning 10 days after planting. 

For multiple applications for rice seed propagation (2 x 0.73 lbs ai/A), flooding occurred one day 

after planting, with the first application occurring 5 days before planting (dry) and the second 

application occurring 5 days after planting (wet). For all scenarios, to simulate the release of 

water, flood water heights and weir heights were set to their respective values (see Table 10) for 

Event 1, but were set to 0 meters on the release day specified as Event 2. For dry applications, 

release of the permanent flood waters from the fields was assumed to begin 7 days after flooding. 

For flooded applications, release of the permanent flood waters from the fields was assumed to 

Direct pesticide application 

to littoral region

Volatilization

Potential Overflow

littoral region degradation

benthic region 

degradation

Littoral region

Benthic region

littoral/benthic mass transfer

Depth

Evaporation Precipitation

Adjustable

Weir

Plant Growth/Shade

Water Input Tolerance
17

begin seven days after the last application. A four-inch water column depth (0.1016 m) and an 

eight-inch water column depth (0.2032 m) were modeled at all sites to characterize the influence 

of water depth on the EDWCs.

The remaining required input parameters used in PFAM were derived from chemical and 

fate properties and information provided in the crop profiles. These inputs are provided in Table 

10. Inputs for the Crop tab, except for the zero height reference which is the emergence date, 

and the Physical tab were left at the pre-determined, default levels (see Appendix C). Inputs on 

the Output tab include the area of application, the area of the surrounding watershed, and the 

curve number for the surrounding watershed. EFED recently updated the percent cropped area 

(PCA) estimates for use in drinking water assessments (USEPA, 2012). Using 8-digit 

hydrologic units (HUC 8) and National Land Cover Data, EFED has developed a PCA of 20% 

for rice. Using this PCA value times the area of the index reservoir watershed (1,728,000 m

2

), 

the area of application (345,600 m

2

) was derived. The area of the surrounding watershed 

(1,382,400 m

2

) was the difference in the index reservoir watershed and the area of application. 

The curve number of the surrounding watershed (83) was obtained from the PRZM Users 

Manual, Table 5.10, assuming the surrounding watershed land was contoured pasture with fair 

hydrologic conditions and a soil group of D, typical of rice growing areas.

As PFAM allows for modeling of the parent and up to two degradates, glufosinateammonium and MPP were modeled as a parent and degradate during the same PFAM runs. In

PFAM, degradates are handled exactly like the parent in regard to their transformations. The 

production of degradates is based on first-order degradation of the parent compound and can be 

modeled as the result of aqueous, soil, or benthic sediment biodegradation, photolysis or 

hydrolysis. The stoichiometry of the degradate production, supplied by the pesticide study 

submissions, is also used as data input to the model. MPP parameters were entered on the 

Degradate 1 tab.

Table 8. Crop-specific dates used for PFAM modeling (Crop tab)

State Planting1 Emergence Date2 Release Date3 Harvesting1

AR April 22 May 2 September 3 September 24

CA May 13 May 23 September 17 October 8

LA April 14 April 24 August 4 August 25

TX April 9 April 19 July 31 August 21

MS May 2 May 12 August 30 September 20

1 Midpoint of dates provided in Table 6.

2 Assumed to occur 10 days after planting.

3 Assumed to occur 21 days before harvesting.

Table 9. Site-specific input dates used for PFAM modeling (Applications and Floods tabs),

based in agronomic practices reported in crop profiles

Use rate, Number of apps, 

retreatment interval, water 

holding period, application 

method (wet or dry)

State App 1 App 2 Flood

(Event 1)

Release

(Event 2) # days

1.46 lbs ai/acre (1.64 kg 

ai/ha), 1, NA, 7 days, dry

and

AR 2-May NA 3-May 10-May 7

CA 23-May NA 24-May 31-May 7

LA 24-Apr NA 25-Apr 2-May 7
18

Use rate, Number of apps, 

retreatment interval, water 

holding period, application 

method (wet or dry)

State App 1 App 2 Flood

(Event 1)

Release

(Event 2) # days

0.89 lbs ai/acre (1.0 kg ai/ha), 

1, NA, 7 days, dry

TX 19-Apr NA 20-Apr 27-Apr 7

MS 12-May NA 13-May 20-May 7

0.73 lbs ai/acre (0.818 kg 

ai/ha), 2, 10 days, 7 days, 1st

app dry and 2nd app flooded1

AR 17-Apr 27-Apr 23-Apr 21-Jun 59

CA 8-May 18-May 14-May 12-Jul 59

LA 9-Apr 19-Apr 15-Apr 13-Jun 59

TX 4-Apr 14-Apr 10-Apr 8-Jun 59

MS 27-Apr 7-May 3-May 1-Jul 59

0.73 lbs ai/acre (0.818 kg 

ai/ha), 2, 10 days, 7 days, 1st

app dry and 2nd app flooded2

AR 17-Apr 27-Apr 23-Apr 27-May 34

CA 8-May 18-May 14-May 17-Jun 34

LA 9-Apr 19-Apr 15-Apr 19-May 34

TX 4-Apr 14-Apr 10-Apr 14-May 34

MS 27-Apr 7-May 3-May 6-Jun 34

0.66 lbs ai/acre (0.732 kg 

ai/ha), 1, NA, 7 days, dry

AR 21-Apr NA 23-Apr 30-Apr 7

CA 12-May NA 14-May 21-May 7

LA 13-Apr NA 15-Apr 22-Apr 7

TX 8-Apr NA 10-Apr 17-Apr 7

MS 1-May NA 3-May 10-May 7

0.44 lbs ai/acre (0.49 kg 

ai/ha), 2, 10 days, 7 days, dry

AR 2-May 12-May 13-May 20-May 7

CA 23-May 2-Jun 3-Jun 10-Jun 7

LA 24-Apr 4-May 5-May 12-May 7

TX 19-Apr 29-Apr 30-Apr 7-May 7

MS 12-May 22-May 23-May 30-May 7

0.44 lbs ai/acre (0.49 kg 

ai/ha), 2, 10 days, 7 days, 

flooded3

AR 2-May 12-May 21-Apr 19-May 28

CA 23-May 2-Jun 12-May 9-Jun 28

LA 24-Apr 4-May 13-Apr 11-May 28

TX 19-Apr 29-Apr 8-Apr 6-May 28

MS 12-May 22-May 1-May 29-May 28

1. Applicable for a 4-inch paddy depth. # days reflects 55-day holding period after 2nd application.

2. Applicable for an 8-inch paddy depth. # days reflects 30-day holding period after 2nd application

3. Release modeled 7 days after 2

nd application. 

Table 10. PFAM inputs specific to glufosinate-ammonium/MPP modeling runs

Input Parameter Value Source Comment

Chemical Tab

Water Column Half-life

(days) at 20°C 63 MRIDs 40345660, 45204402/01

Represents the 90th percentile upper confidence 

bound on the mean (39) of 5 aerobic aquatic 

half-life values.1

Benthic Compartment 

Half-Life (days) at 20°C 1246 MRID 46258601 3 times the anaerobic aquatic half-life.

1

Unflooded Soil Half-life

(days) at 20°C 19 MRIDs 41323118, 40345659A

Represents the 90th percentile upper confidence 

bound on the mean (15) of 6 aerobic soil halflife values.

1

Aqueous Near Surface

Half-life (days) at 40° 

Latitude

1x108 MRID 41323115 No evidence of aqueous photolysis.
19

Input Parameter Value Source Comment

Hydrolysis Half-life

(days) 1x108 MRID 40345656 No evidence of degradation.

Organic Carbon Partition

Coefficient (mL/goc) (Koc)

297 MRID 40345662 Average of three KOC values.

Molecular Weight (g/mol) 198 --- ---

Vapor Pressure (torr) 7.5x10-9 MRID 44032901 ---

Solubility (mg/L) 1.37x106 MRID 00263025

Heat of Henry (J/mol) 49884 ---

Estimated using HENRYWIN program in 

EPISuite (see Appendix B).

Henry Reference 

Temperature (oC) 20

Applications Tab

Number of Applications See Table 9

Application dates See Table 9

Location Tab

Meteorological files

AR (w13963)

LA (w13970)

CA (w23232)

MS (w03940)

TX (w13958)

---

Meteorological data available in PE5 

installation. Stations correspond to

Little Rock, AR (w13963), Baton Rouge, LA 

(w13970), Sacramento, CA (w23232), Jackson, 

MS (w03940), and Austin, TX (w13958)

Floods Tab

Number of Flood Events 2 ---

First event is flooding, second event is release 

of flood waters.

Date for Event 1 See Table 9

Fill Level (m), Event 1 0.10162

0.20323 --- Crop profiles

Weir Level (m), Event 1 0.12702

0.22863 ---

Assumed 1 inch clearance between top of weir 

and water.

Min. Level (m), Event 1 0.10162

0.20323 --- Keeps paddy full

Number of Days, Event 2 See Table 9

Fill Level (m), Event 2 0 --- Simulate release of water

Weir Level (m), Event 2 0 --- Simulate release of water

Min. Level (m), Event 2 0 --- Simulate release of water

Turn Over (1/day), Events 

1 and 2 0 ---

Turnover is used for those systems that use a

continuous flow through the system and are 

maintained at a set depth. Set to 0.

Crop Tab

Zero Height Reference

AR: 05/02

CA: 05/23

LA: 04/24

TX: 04/19

MS: 05/12

---

Emergence date, assumed to occur 10 days 

after planting. See Table 8 for dates.

Days from Zero Height to 

Full Height

AR: 124

CA: 118

LA: 102

TX: 103

MS: 111

---

Number of days from emergence to maturation. 

Maturation expected to occur 21 days prior to 

harvesting. See Table 8 for dates.
20

Input Parameter Value Source Comment

Days from Zero Height to 

Removal

AR: 145

CA: 139

LA: 123

TX: 124

MS: 132

---

Number of days from emergence to harvest. 

See Table 8 for dates.

Maximum Fractional 

Areal Coverage 1.0 --- Conservative assumption

Physical Tab

Reference depth (m) 0.12702

0.22863

Set to same depth as weir height, per PFAM 

guidance.

Output Tab

Area of Application (m2)

4

345,600 ---

20% of the watershed drainage acreage 

(1,728,000 m2), based on draft HUC-8 PCA for 

rice

Area of Surrounding 

Watershed (m2)

4 1,382,400 ---

Difference in watershed drainage acreage 

(1,728,000 m2) and area of application

Curve Number of 

Surrounding Watershed4 83 ---

Curve number for a contoured pasture with Fair 

hydrologic conditions and a Soil Group of D

Degradate 1 Tab

Moles of Degradate 

Produced per mole of 

Parent

Water

Benthic

Unflooded soil

Photolysis

Hydrolysis

1

0

1

0

0

---

Estimates based on stochiometry of glufosinate 

ammonium degradation to MPP and whether 

MPP was formed in the particular studies. MPP 

was a degradate in the aerobic soil and aerobic 

aquatic studies, but not in the anaerobic 

aquatic, aqueous photolysis, and hydrolysis 

studies for glufosinate-ammonium (DP 397388, 

1/4/2012).

Water Column Half-life

(days) at 20°C 3730 MRIDs 40345660, 45204402/01

Represents the 90th percentile upper confidence 

bound on the mean (1247) of 2 aerobic aquatic 

half-life values.1

Benthic Compartment 

Half-Life (days) at 20°C 1x108

--- Assumed stable.

Unflooded Soil Half-life

(days) at 20°C 22

MRIDs 41323118, 

40345659A

Represents the 90th percentile upper confidence 

bound on the mean (18) of 5 aerobic soil halflife values.1

Aqueous Near Surface

Half-life (days) at 40° 

Latitude

1x108--- Assumed stable.

Hydrolysis Half-life

(days) 1x108

--- Assumed stable.

Organic Carbon Partition

Coefficient (mL/goc) (Koc)

145 MRID 40345662

Average of three KOC values for MPP. A 

value of <17 L/kg was assumed to be 17 in the 

calculation.

Molecular Weight (g/mol) 152.09 --- EPISuite

Vapor Pressure (torr) 3.7x10-5--- EPISuite

Solubility (mg/L) 1x106--- EPISuite

Heat of Henry (J/mol) 49884 ---

Estimated using HENRYWIN program in 

EPISuite (see Appendix B).

Henry Reference 

Temperature (oC) 20
21

Input Parameter Value Source Comment

1 EFED input parameter guidance is located at: : http://www.epa.gov/oppefed1/models/water/input_parameter_guidance.htm

2 Heights used for a 4-inch paddy.

3 Heights used for an 8-inch paddy.

4Used when employing the index reservoir function in PFAM. 

The 90th percentile peak (acute) and annual average (chronic) concentrations for the 

Arkansas, California, Louisiana, Mississippi, and Texas PFAM runs without the use of the index 

reservoir are provided in Table 11. The 90th percentile concentration was selected to reflect the 

1-in-10 year peak concentration, similar to the method used in EFED’s drinking water modeling 

using PRZM/EXAMS. The effluent concentrations are obtained from the pp1 files generated by

PFAM (see Appendix D). Maximum concentrations for the effluent are estimated for each year 

using concentration values designated as “overflow” or “manual release”. “Dry field runoff” 

values are excluded from the analysis, as these values are indicative of times when a rice paddy 

is not present. These estimated concentrations result in conservative estimates of acute drinking 

water concentrations and reflect possible concentrations that may occur when the drinking water 

intake is near the location where effluent is released, and mixing with uncontaminated water is 

minimal. The annual average EDWC was estimated by taking the upper 90th percentile 

concentration and allowing it to degrade in water for 365 days using the aerobic aquatic 

metabolism half-life of 63 and 3,730 days for glufosinate-ammonium and MPP, respectively, and

estimating the average daily concentration during the 365 days. The values for a particular 

application, regardless of the site, are fairly close, as the main differences between the sites are 

dates of precipitation which results in overflow removing water from the paddy. As a result, the 

site with the lowest precipitation, the California scenario, provides the highest glufosinateammonium concentrations. For all sites and applications, chronic values are approximately 76% 

and 3% lower than the acute values for glufosinate-ammonium and MPP, respectively. The 

concentrations in the 8-inch paddies are also roughly 50% lower than those in the 4-inch paddies, 

except for the scenarios with multiple applications for rice seed propagation, where 

concentrations in the 8-inch paddies were 90% of the concentrations in 4-inch paddies.

Table 11. EDWCs using the PFAM without-the-index-reservoir.

Use rate, number of apps, 

retreatment interval, water 

holding period, application 

timing

Site

Glufosinate-ammonium MPP

Acute EDWC 

(μg/L)

Annual Average 

EDWC (μg/L)

Acute EDWC 

(μg/L)

Annual Average 

EDWC (μg/L)

4” 8” 4” 8” 4” 8” 4” 8”

1.46 lbs ai/acre, 1, NA, 7 days, 

dry1

AR

CA

LA

MS

TX

165

173

163

161

163

84

86

84

83

84

40

42

40

39

40

21

21

20

20

21

4.5

5.0

5.1

5.7

5.2

2.3

2.5

2.7

2.9

2.7

4.3

4.8

4.9

5.5

5.0

2.3

2.4

2.6

2.8

2.6

0.73 lbs ai/acre, 2, 10 days, 

30/55 days, dry and flooded2

AR

CA

LA

MS

TX

344

390

318

313

344

294

320

288

282

296

84

95

78

77

84

72

78

70

69

72

159

173

158

183

181

73

81

83

88

85

154

167

153

177

175

71

78

80

85

82

0.89 lbs ai/acre, 1, NA, 7 days, 

dry1

AR

CA

LA

MS

101

106

100

99

51

53

51

51

25

26

24

24

13

13

13

12

2.7

3.1

3.1

3.5

1.4

1.5

1.6

1.8

2.6

3.0

3.0

3.4

1.4

1.5

1.6

1.7
22

Use rate, number of apps, 

retreatment interval, water 

holding period, application 

timing

Site

Glufosinate-ammonium MPP

Acute EDWC 

(μg/L)

Annual Average 

EDWC (μg/L)

Acute EDWC 

(μg/L)

Annual Average 

EDWC (μg/L)

4” 8” 4” 8” 4” 8” 4” 8”

TX 100 51 24 13 3.1 1.7 3.0 1.6

0.66 lbs ai/acre, 1, NA, 7 days, 

dry

AR

CA

LA

MS

TX

71

74

71

71

72

37

38

37

36

37

17

18

17

17

18

9

9

9

9

9

1.8

2.0

2.1

2.2

2.1

0.9

1.0

1.1

1.1

1.1

1.7

1.9

2.0

2.1

2.0

0.9

1.0

1.0

1.1

1.0

0.44 lbs ai/acre, 2, 10 days, 7 

days, dry1

AR

CA

LA

MS

TX

83

88

83

81

84

43

45

42

42

43

20

22

20

20

21

11

11

10

10

10

2.7

2.9

2.8

3.0

2.9

1.4

1.5

1.4

1.5

1.5

2.6

2.8

2.7

2.9

2.8

1.3

1.4

1.4

1.5

1.4

0.44 lbs ai/acre, 2, 10 days, 7 

days, flooded3

AR

CA

LA

MS

TX

NA

365

375

356

360

365

NA

89

92

87

88

89

NA

39

40

39

45

42

NA

38

39

38

44

41

1 Release modeled 7 days after flooding. Time period allows for dry applied product to partition to water phase 

from sediment phase. The field was flooded 24-hours after the last application.

2 1

st application is made to dry soil, while the 2nd application is made while the rice paddy is flooded. The 30-day 

holding period is applicable to an 8-inch paddy depth, while a 55-day holding period is applicable to a 4-inch 

paddy depth.

3 Release modeled 7 days after last application. As flooding for wet applications occurs prior to planting, holding 

times are greater than 7 days.

For glufosinate-ammonium and MPP, flooded applications generated higher PFAM 

concentrations than dry application scenarios. This is different than the trend of results from the 

refined Tier I analysis, where the highest single application rate (1.46 lbs ai/A) generated the 

highest acute EDWCs, with all other applications generating similar acute EDWCs. This 

difference is due primarily to how each model treats mass transfer between the water column and 

the sediment. PFAM treats mass transfer as a diffusion-driven, time-limited process, while the 

refined Tier 1 model assumes instantaneous equilibrium of chemical between sediment and water

phases. The glufosinate-ammonium PFAM concentrations in the flooded applications were 

similar to those obtained with the refined Tier I model, while the dry applications were 

significantly lower (approximately 82%). For MPP, the PFAM concentrations for dry 

applications were significantly lower (approximately 99%), while reductions in the flooded 

applications were comparable to the dry glufosinate-ammonium applications (approximately 

82%). It appears that for glufosinate-ammonium and MPP during flooded applications, the 

majority of the compound remains in the water column after application, resulting in higher 

concentrations than occur following dry applications. 

While the PFAM runs do not entirely match the conditions under which the glufosinateammonium AFD was conducted, a comparison of the results from the two datasets for a 4-inch 

paddy depth indicates striking similarities. For glufosinate-ammonium, the PFAM 

concentrations were very similar to those from the AFD study (83 μg/L versus 93 μg/L for a 

Louisiana effluent (dry application) and 375 μg/L versus 288 μg/L for a California effluent

(flooded application)). For MPP, the concentrations were similar for the flooded application (40 
23

μg/L versus 42 μg/L for a California effluent (flooded application)), but much lower for the dry 

applications (2.8 μg/L versus 102 μg/L for a Louisiana effluent (dry application)).

5.3.Monitoring Data

Glufosinate-ammonium and MPP

Glufosinate-ammonium is included as one of the analytes monitored in U.S. surface and 

groundwater under the USGS’s National Water Quality Assessment (NAWQA) program 

(http://water.usgs.gov/nawqa). In surface water, glufosinate-ammonium was detected as 

recoverable, filtered glufosinate (0.7 micron glass fiber filter) 7 times out of 177 samples 

collected in Washington and Bolivar counties (rice-growing counties) in Mississippi, with a 

concentration range of 0.02 to 3.23 μg/L. In 68 samples collected in Merced, San Joaquin, and 

Stanislaus counties in California, glufosinate-ammonium was not detected (detection limit of 0.1 

μg/L). Surface water and sediment monitoring data were not available for glufosinateammonium from the California Department of Pesticide Regulation’s (CDPR) database. It 

should be emphasized that these monitoring values are not directly comparable to modeling 

results. As the monitored data is for glufosinate and not MPP, and as most monitored values are 

not targeted to rice growing regions or to the particular time of the year that paddy waters are 

discharged, modeled estimates are expected to be higher than non-targeted monitoring results. 

Other Pesticides Used Exclusively on Rice

A review of the molinate Reregistration Eligibility Decision (RED) was conducted to 

determine if monitoring data near drinking water intakes could be used to assess the level of 

annual concentrations relative to peak concentrations in surface water which might be found in 

the vicinity of drinking water treatment plant intakes. Molinate is an herbicide that was 

exclusively used on rice, so concentrations in surface water could be directly attributed to rice 

use. Table 12 presents the summary data obtained from Table 3 of Appendix E of the RED for 

drinking water intakes for the cities of Sacramento, CA, West Sacramento, CA, St. Francisville, 

LA, and Melville, LA. Surface water intakes for cities in Arkansas and Mississippi were not 

available in rice producing areas of the States. Sacramento gets its drinking water from the 

intake that is below the confluence of the American and Sacramento Rivers. Approximately 71.4 

% of their water is obtained from the Sacramento River. For West Sacramento, California, all of 

their water is obtained from the Sacramento River. To adjust for the source of water, the 

maximum and annual concentrations for the City of Sacramento were divided by the average 

percent of Sacramento River that Sacramento receives (71.4 % from 1991-2000), and multiplied 

by 100. Based on this data, time-weighted annual mean concentrations reported in the RED are 

approximately 80-88% lower than the maximum concentrations. However, molinate is more 

volatile than glufosinate-ammonium, so other active ingredients were also examined.

Thiobencarb is another herbicide that has been used exclusively on rice. Laboratory

studies indicate thiobencarb is stable in aquatic environments. Thiobencarb is moderately 

mobile to immobile and semivolatile. In aquatic field dissipation studies, thiobencarb dissipated 

relatively quickly in the water column, with DT50s less than 9 days. Given this information, the 

fate of thiobencarb appears similar to that of glufosinate-ammonium and its degradates. EFED 

examined the CDPR surface water database for thiobencarb data, particularly for Colusa Basin 
24

Drain, which is used to provide irrigation water and drain water from fields in Colusa County. 

Colusa County is one of the top rice-producing counties in California, with many rice paddies 

potentially discharging to the Colusa Basin Drain upstream from Colusa Basin Drain # 5. Data 

were available for 1995 through 2002 for Colusa Basin Drain # 5. Additional data for 1994 were

obtained from the thiobencarb RED. Data were collected between the months of March and July

each year. Sampling intervals ranged from two to five days, except for the time between the first 

and second sampling periods, which was between 22 and 35 days. An analysis of the data 

(Table 13) indicates a reduction of 48-93% in time-weighted average seasonal concentrations 

when compared to peak concentrations. An average reduction value of 74% was obtained from 

the annual values. It should be noted that the lowest reduction, 48%, occurred during the 

shortest sampling period.

Fipronil is an insecticide used on rice. Fipronil is stable to hydrolysis under mildly acidic

to neutral pH conditions, but hydrolyzes under alkaline conditions. Field persistence of fipronil is 

low to moderate in water and soil (USEPA, 2001). Fipronil monitoring data were available for

2000 and 2001 for parishes in Louisiana in the Mermentau River Basin (Appendix C, USEPA 

2001). In response to reports of low crawfish production in 1999 possibly due to the use of 

fipronil, a study of fipronil toxicity was conducted in the Mermentau River Basin. Eighteen 

stations throughout the rice belt were sampled weekly from March through August in 2000. In

2001, a follow up study was undertaken on eleven of the same stations. Weekly water column

samples were collected beginning in March and continued until no detects were observed at any 

of the stations or August, whichever came first. Analysis of the data (Table 14) shows a 

reduction of 65-92% in time-weighted average seasonal concentrations compared to peak 

concentrations. An average reduction value of 84% was obtained from the annual values. It

should be noted that, while the samples were collected from March to August, permanent flood 

field water is normally held until two weeks prior to harvest (mid July through September,

depending upon when the rice was planted), at which time it is released. It is believed that this 

practice contributes the greatest loads of fipronil to the Mermentau River Basin (USEPA, 2001), 

so maximum values, as well as chronic averages, could be higher.

Based on the percent reduction from acute to chronic values generated from this 

monitoring data, and using the acute estimates generated using PFAM, chronic EDWCs were 

estimated using percent reductions of 50% (Table 15). Glufosinate-ammonium and MPP results 

followed the same trends as discussed earlier in Section 5.2. Glufosinate-ammonium chronic 

values were 2x higher than the PFAM values reported in Table 11, while MPP chronic values 

were 2x lower than the PFAM values.
25

Table 12. Comparison of molinate acute and chronic concentrations at surface water intakes

Location 

(Source of Data2) 

Frequency 

of Detection 

(Range of 

detection 

limits)

Molinate Parent + degradates of concern1

Maximum 

Concentration3 

(μg/L)

Timeweighted 

Annual 

Means3

(μg/L)

%

Reduction6

Maximum 

Concentration3

(μg/L)

Timeweighted 

Annual 

Means3

(μg/L)

%

Reduction6

Sacramento, California 

(Raw water from the Sacramento River 

after holding periods (1991-2000 data))

4 65/117

(0.1 μg/L)

1.52 0.29 81% 2.37 0.45 81%

West Sacramento, California 

(Raw water from the Sacramento River 

after holding periods (1991-2000 data) 

adjusted for the percent flow data at City of 

Sacramento)

5

65/117

(0.1 μg/L)

2.13 0.41 81% 3.32 0.64 81%

Arkansas and Mississippi (no surface water 

intakes in rice-production areas)

Not 

Applicable 0 0 NA 0 0 NA

New Orleans Area (Raw water from 1996-

1999 USGS data in the Mississippi River at 

St. Francisville, LA)

13/58

(0.004 μg/L)

0.117 0.014 88% 0.18 0.022 88%

St. Mary Parish, Louisiana Intakes at 

Atchafalaya River (Raw water from 1996-

1999 USGS data at Melville, LA)

15/57

(0.004 μg/L) 0.105 0.018 83% 0.17 0.028 84%

1. Maximum and annual mean concentrations for molinate adjusted by a factor of 1.56 to account for hydroxy molinate (2-,3-,4-), molinate sulfoxide and acid, 

and 4-keto molinate, considered degradates of concern which were identified in registrant submitted studies and open literature.

2. Indicates source that authors of the molinate RED used to develop the estimates.

3. Maximum concentration is the upper 95th percentile of the annual maximum concentration values. Time-weighted annual means are the upper 95th

percentile of the annual means. In estimating annual means, non-detect values were set equal to the limit of detection.

4. Sacramento gets their drinking water from the intake that is below the confluence of the American and Sacramento Rivers. Approximately 71.4 % of their 

water is obtained from the Sacramento River.

5. For West Sacramento, California, all of their water is obtained from the Sacramento River. To adjust for the source of water, the maximum and annual 

concentrations for the City of Sacramento were divided by the average percent of Sacramento River that Sacramento receives (71.4 % from 1991-2000), and 

multiplied by 100.

6. The % Reduction is calculated by dividing the difference in the maximum concentration and the time-weighted average mean by the maximum

concentration and multiplying by 100.
26

Table 13. Comparison of peak and time-weighted average seasonal concentrations for 

thiobencarb at Colusa Basin Drain #5

Year % NDs

Sampling 

Period 

(days)

Peak

concentration

(μg/L)

TWA Seasonal 

Concentration (μg/L) % Reduction

1994 0% 63 37.4 2.75 93%

1995 38% 97 3.67 0.93 75%

1996 30% 87 16.55 2.74 83%

1997 19% 87 12.30 2.23 82%

1998 29% 100 11.00 2.49 77%

1999 7% 72 11.80 3.38 71%

2000 0% 44 10.70 5.61 48%

2001 26% 100 5.90 1.82 69%

2002 35% 100 7.58 2.41 68%

Table 14. Comparison of peak and time-weighted average seasonal concentrations for 

fipronil in Louisiana1

Parish Site ID

2000 2001

Max Conc

(μg/L)

TWA 

Seasonal 

Conc

(μg/L)

%

Reduction

Max 

Conc

(μg/L)

TWA 

Seasonal 

Conc

(μg/L)

%

Reduction

Vermilion IX-01 0.37 0.029 92.0% -- -- --

Acadia IX-02 6.78 1.100 83.3% -- -- --

Acadia IX-03 4.09 0.391 90.5% -- -- --

Vermilion IX-04 1.74 0.261 85.0% 0.52 0.052 89.9%

Acadia IX-05 4.08 0.722 82.3% 2.19 0.316 85.6%

Acadia IX-06 2.81 0.593 78.9% 1.06 0.266 74.9%

Acadia IX-07 8.41 0.910 89.2% -- -- --

Acadia IX-08 3.47 0.398 88.5% 1.44 0.500 65.3%

Jefferson Davis IX-09 4.16 0.409 90.2% -- -- --

Jefferson Davis IX-10 4.88 0.393 91.9% -- -- --

Jefferson Davis IX-11 3.12 0.436 86.0% 2.38 0.475 80.0%

Cameron IX-15 0.79 0.128 83.7% 0.41 0.065 84.0%

Acadia IXWM-03 4.76 0.682 85.7% -- -- --

Acadia IXWM-04 4.98 1.030 79.3% 2.83 0.448 84.2%

Jefferson Davis IXWM-05 6.24 0.741 88.1% 5.17 0.485 90.6%

Acadia IXWM-06 2.63 0.258 90.2% 0.98 0.316 67.8%

Jefferson Davis IXWM-07 1.53 0.185 87.9% 1.54 0.246 84.0%

Acadia IXWM-08 4.09 0.699 82.9% 2.66 0.347 86.9%

1. Stations were sampled weekly from March through August in 2000. In 2001, weekly water column samples 

were collected beginning in March and continued until no detects were observed at any of the stations or 

August, whichever came first.
27

Table 15. Chronic EDWCs assuming 50% reduction based on monitoring data for other 

rice pesticides

Use rate, number of apps, 

retreatment interval, water 

holding period, application 

timing

Site

Glufosinate-ammonium MPP

Acute EDWC 

(μg/L)

Annual Average 

EDWC (μg/L)

Acute EDWC 

(μg/L)

Annual Average 

EDWC (μg/L)

4” 8” 4” 8” 4” 8” 4” 8”

1.46 lbs ai/acre, 1, NA, 7 days, 

dry1

AR

CA

LA

MS

TX

165

173

163

161

163

84

86

84

83

84

83

87

82

81

82

42

43

42

42

42

4.5

5.0

5.1

5.7

5.2

2.3

2.5

2.7

2.9

2.7

2.3

2.5

2.6

2.9

2.6

1.2

1.3

1.4

1.5

1.4

0.73 lbs ai/acre, 2, 10 days, 

30/55 days, dry and flooded2

AR

CA

LA

MS

TX

344

390

318

313

344

294

320

288

282

296

172

195

159

157

172

147

160

144

141

148

159

173

158

183

181

73

81

83

88

85

80

87

79

92

91

37

41

42

44

43

0.89 lbs ai/acre, 1, NA, 7 days, 

dry1

AR

CA

LA

MS

TX

101

106

100

99

100

51

53

51

51

51

51

53

50

50

50

26

27

26

26

26

2.7

3.1

3.1

3.5

3.1

1.4

1.5

1.6

1.8

1.7

1.4

1.6

1.6

1.8

1.6

0.7

0.8

0.8

0.9

0.9

0.66 lbs ai/acre, 1, NA, 7 days, 

dry

AR

CA

LA

MS

TX

71

74

71

71

72

37

38

37

36

37

36

37

36

36

36

19

19

19

18

19

1.8

2.0

2.1

2.2

2.1

0.9

1.0

1.1

1.1

1.1

0.9

1.0

1.1

1.1

1.1

0.5

0.5

0.6

0.6

0.6

0.44 lbs ai/acre, 2, 10 days, 7 

days, dry1

AR

CA

LA

MS

TX

83

88

83

81

84

43

45

42

42

43

42

44

42

41

42

22

23

21

21

22

2.7

2.9

2.8

3.0

2.9

1.4

1.5

1.4

1.5

1.5

1.4

1.5

1.4

1.5

1.5

0.7

0.8

0.7

0.8

0.8

0.44 lbs ai/acre, 2, 10 days, 7 

days, flooded3

AR

CA

LA

MS

TX

NA

365

375

356

360

365

NA

183

188

178

180

183

NA

39

40

39

45

42

NA

20

20

20

23

21

1 Release modeled 7 days after flooding. Time period allows for dry applied product to partition to water phase 

from sediment phase. Given persistence in water, this delay does not result in any significant degradation before 

release. The field was flooded 24-hours after the last application.

2 1

st application is made to dry soil, while the 2nd application is made while the rice paddy is flooded. The 30-day 

holding period is applicable to an 8-inch paddy depth, while a 55-day holding period is applicable to a 4-inch 

paddy depth.

3 Release modeled 7 days after last application. As flooding for wet applications occurs prior to planting, holding 

times are greater than 7 days. Given persistence in water, this delay does not result in any significant degradation 

before release.

5.4. Pesticides in Flooded Applications Model (PFAM) with the Index Reservoir

PFAM estimates exposure in the rice paddy effluent, which is eventually mixed with

surface water which potentially flows to a drinking water intake. Mixing of rice paddy water 

with other surface water will result in dilution of the paddy water and reductions in the drinking 

water concentrations; this is especially true for estimated chronic concentrations. In order to 
28

account for this, PFAM was set up to flow (mass and volume) into the index reservoir, the 

standard drinking water body used by EFED to estimate surface water source drinking water 

concentrations (USEPA, 2010) using the varying volume pond model (FIFRA SAP, 2004). This 

portion of the model is still under development and evaluation, so the derived estimates are 

provisional. The inputs for this version of PFAM were the same as the previous inputs outlined 

in Table 10.

The 1-in-10 year acute and 1-in-10-year chronic EDWCs from the Arkansas, California, 

Louisiana, Mississippi, and Texas scenarios are provided in Table 16. Compared to the results 

depicted in Table 11, the addition of the index reservoir results in significant reductions in 

EDWCs for glufosinate-ammonium, but in some cases results in increased concentrations of

MPP. For a particular use rate, results for the various simulated regions were similar for 

glufosinate-ammonium, but the California region consistently produced the highest MPP 

EDWCs, presumably due to the lower rainfall in California compared with the other States. 

Because there is less rainfall, there is less runoff from the watershed. The runoff from the 

watershed is used to fill the reservoir and generate flow out of the reservoir, resulting in a 

dilution of the concentrations in the index reservoir over time. An analysis of the PFAM runs 

indicates it takes approximately 645 days to flush the index reservoir in California, whereas in 

Texas it takes 171 days to flush the index reservoir and less than 105 days for Arkansas, 

Louisiana, and Mississippi. This longer residence time, coupled with the persistence of MPP in 

aerobic aquatic environments, results in increased concentrations for MPP, as MPP continues to 

accumulate in the California index reservoir from year to year. In general, results generated 

using PFAM coupled with the index reservoir indicate 73-85% and 4-47% reductions from peak 

to annual average concentrations for glufosinate-ammonium and MPP, respectively. Reductions 

in acute to chronic concentrations were 76% and 3% for glufosinate-ammonium and MPP, 

respectively, using PFAM without-the-index-reservoir, and accounting for aerobic aquatic 

degradation separately. It should also be noted that, unlike the previous model runs, the 8-inch 

paddy concentration results are higher than those generated for the 4-inch paddy. This occurs 

because the larger volume discharged from an 8-inch paddy as compared with a 4-inch paddy 

more than compensates for the lower concentration, in terms of pesticide load delivered to the 

reservoir.

Table 16. Results from PFAM analysis with the index reservoir

Use rate, number of apps, 

retreatment interval, water 

holding period, application 

timing

Site

Glufosinate-ammonium MPP

Acute EDWC 

(μg/L)

Annual Average 

EDWC (μg/L)

Acute EDWC 

(μg/L)

Annual Average 

EDWC (μg/L)

4” 8” 4” 8” 4” 8” 4” 8”

1.46 lbs ai/acre, 1, NA, 7 days, 

dry1

AR

CA

LA

MS

TX

49

44

44

47

46

52

46

47

50

49

11

11

8

9

9

11

11

8

9

9

32

105

24

31

45

34

112

25

33

48

23

98

14

22

33

24

105

15

23

35

0.73 lbs ai/acre, 2, 10 days, 

30/55 days, flooded2

AR

CA

LA

MS

TX

98

90

105

87

88

153

158

144

141

147

22

22

18

21

18

27

39

22

24

24

104

342

77

109

136

128

502

101

134

180

66

313

47

59

108

81

463

56

82

123
29

Use rate, number of apps, 

retreatment interval, water 

holding period, application 

timing

Site

Glufosinate-ammonium MPP

Acute EDWC 

(μg/L)

Annual Average 

EDWC (μg/L)

Acute EDWC 

(μg/L)

Annual Average 

EDWC (μg/L)

4” 8” 4” 8” 4” 8” 4” 8”

0.89 lbs ai/acre, 1, NA, 7 days, 

dry1

AR

CA

LA

MS

TX

30

27

27

29

28

32

28

28

30

30

7

7

5

5

5

7

7

5

5

6

20

64

15

19

27

21

68

15

20

29

14

60

8

13

20

15

64

9

14

21

0.66 lbs ai/acre, 1, NA, 7 days, 

dry

AR

CA

LA

MS

TX

23

18

20

22

20

24

19

21

23

22

4.8

4.7

3.6

4.1

4.0

5.0

5.1

3.9

4.3

4.2

14

45

10

13

19

15

48

11

14

20

9.7

42

6.3

9.2

14

10

45

6.6

9.7

15

0.44 lbs ai/acre, 2, 10 days, 7 

days, dry1

AR

CA

LA

MS

TX

28

22

24

25

25

29

23

25

26

27

6

6

4

4

5

6

6

4

5

5

19

53

13

15

22

19

56

13

16

23

12

50

7

11

18

13

54

8

12

19

0.44 lbs ai/acre, 2, 10 days, 7 

days, flooded2

AR

CA

LA

MS

TX

NA

178

185

173

173

176

NA

30

46

26

28

28

NA

117

515

94

128

174

NA

75

476

54

82

118

1 Release modeled 7 days after flooding. Time period allows for dry applied product to partition to water phase 

from sediment phase. Given persistence in water, this delay does not result in any significant degradation before 

release. The field was flooded 24-hours after the last application.

2 Release modeled 7 days after last application. As flooding for wet applications occurs prior to planting, holding 

times are greater than 7 days. Given persistence in water, this delay does not result in any significant degradation 

before release.

6. Uncertainty Analyses

The refined Tier I model and PFAM without-the-index-reservoir provide estimates of 

pesticide active ingredient in the effluent water discharged from a treated rice paddy, which are 

considered to constitute conservative concentration estimates for community water supply 

intakes near rice production areas. EDWCs developed using these models may overestimate 

concentrations at drinking water intakes located significantly downstream of rice-growing areas, 

because they do not account for associated dilution. 

In running PFAM, the conservative assumption was employed, that no flooding events 

occurred prior to permanent flood. A common practice in rice production is to “flush” the fields 

2-3 times between planting and establishment of the permanent flood, depending on the moisture 

level in soil (USEPA, 2011). Such flushing would presumably act to partially remove 

glufosinate-ammonium and MPP from soil/sediment, such that concentrations in paddy water 

during the permanent flood would be lessened. Because the model runs done using PFAM do 

not account for this effect, modeled concentrations may be higher than concentrations in 

permanent flood waters of rice fields on which flushing has been conducted.

In modeling it was assumed that paddy water is released seven to fifty-five days after 

glufosinate-ammonium application. However, in practice, once a permanent flood is established, 
30

the flood may be maintained until 2 to 3 weeks before harvesting, allowing for more degradation 

of glufosinate-ammonium (though not for MPP, given its stability in the aerobic aquatic 

environment), and thus lower release concentrations. 

In the PFAM modeling, upper 90th percentile confidence limits on mean half-lives for 

degradation in water and unflooded soil were used for glufosinate-ammonium, in accordance 

with EPA guidance. Use of these values may exaggerate the stability of glufosinate-ammonium 

in these compartments, thereby generating conservative EDWC estimates for glufosinateammonium. However, to the extent that this is the case, they will also underestimate the rate of 

formation, and thus the EDWCs, of MPP. To evaluate the impact that assumed half-lives have 

on PFAM-modeled concentrations, EFED also examined use of the lower 90th percentile 

confidence limits on mean half-lives for glufosinate-ammonium in water (15 days) and 

unflooded soil (11 days). Resulting MPP concentrations were 2.5 to 4 times greater under these 

assumptions.

Environmental fate data for MPP were estimated from registrant-submitted studies, 

primarily conducted using glufosinate-ammonium, and EPISuite. For degradation in aerobic 

aquatic environments, MPP half-lives were estimated from a study submitted for glufosinateammonium (MRID 45204402/01) in two water-sediment systems, which indicated that MPP was 

persistent (half-life ranging from 441 to 2,054 days). There is significant uncertainty about these 

half-lives, because the study was not conducted by applying MPP as starting material, and 

because the half-life developed for the sand system with 1 ppm applied glufosinate-ammonium

was based on only four data points. Additionally, as data on MPP were not available for 

hydrolysis, aqueous photolysis, and anaerobic aquatic metabolism, MPP was assumed to be 

stable via these routes of degradation. Collectively, these assumptions generate little to no 

decrease from acute to chronic concentrations for MPP, and may overstate the compound’s 

stability.

Monitoring data from other pesticides were used to develop percent reduction values 

between peak and time-weighted average concentrations in order to estimate chronic EDWCs for 

glufosinate-ammonium and MPP. These pesticides have varying physical and chemical 

properties, which result in levels of persistence in the water column and soil that are likely

different than those for glufosinate-ammonium and MPP. Additionally, the monitoring data 

were collected during the spring and summer months, and may not be representative of 

pesticides in final paddy release waters. Thus there is the possibility that use of the 50%

reduction factor could result in underestimation of chronic concentrations of glufosinateammonium and MPP. Given that the percent reduction values developed for the three other 

pesticides are similar however, despite differences in their fate properties, any such 

underestimation of chronic EDWCs for glufosinate-ammonium and MPP may not be significant.

The Liberty

®

280 SL and Liberty

®

products are currently not registered in California and, 

therefore, are not used for weed control on rice in California. As a result, the EDWCs developed 

for the California rice scenario, used as recommended EDWCs in this assessment, would only be 

applicable if Liberty®280 SL and Liberty® were registered in the state in the future.
31

The PFAM model has been adapted to include the index reservoir as a means for 

quantifying releases from rice fields into drinking water reservoirs, which are natural or artificial 

lakes used as raw water sources for community water systems. Reservoirs are usually fed by

multiple streams, whose flow is governed by local precipitation, runoff and baseflow. In some

areas of the country the use of reservoirs for drinking water supply is not common, and in such

cases water supply intakes may be located in unimpounded, flowing sections of streams or rivers.

PFAM runs using the index reservoir assumed a watershed area of 345,600 m

2

, derived 

from a provisional PCA based on 8-digit hydrologic unit code (HUC-8) watersheds of 20%. In

smaller, more vulnerable watersheds, the fractional area composed of rice paddies could be 

higher than this, resulting in a larger treated area with less surrounding land to provide dilution 

water. In such cases, the model may underestimate pesticide concentrations.

7. Discussion and Conclusions

EFED evaluated acute EDWCs using a refined Tier I Rice Model and PFAM withoutthe-index-reservoir. EFED estimated chronic concentrations using several methods, including: 

adjusting the acute concentration by allowing the glufosinate-ammonium and MPP to degrade 

via aerobic aquatic degradation; evaluating monitoring data for other pesticides used 

predominately for rice growing and adjusting PFAM EDWCs by an acute-to-chronic 

concentration correction factor; and, coupling PFAM outputs to the index reservoir. Use of the 

aerobic aquatic degradation rates resulted in chronic EDWCs that were 76% and 3% lower than 

the acute EDWCs for glufosinate-ammonium and MPP, respectively. Monitoring data for other 

pesticides used predominately for rice growing indicate that chronic EDWCs could be 50 to 90% 

lower than the acute EDWCs. Use of PFAM with the index reservoir estimated acute and 

chronic concentrations in a receiving waterbody, indicating 73-85% and 4-47% reduction from

peak to annual average concentrations for glufosinate-ammonium and MPP, respectively. As the 

effluent concentrations derived using PFAM have been through internal and external review and 

evaluation, EFED recommends the use of the acute EDWCs derived from PFAM without-theindex-reservoir, and chronic EDWCs derived using aerobic aquatic degradation kinetics, as 

conservative estimates for glufosinate-ammonium and MPP in drinking water.

Table 17. EDWCs for glufosinate-ammonium use on rice

Use rate, Number of apps, retreatment interval, 

water holding period, application timing

Acute EDWC 

(μg/L)

Annual Average EDWC1

(μg/L)

4” 8” 4” 8”

Glufosinate-ammonium

1.46 lbs ai/acre, 1, NA, 7 days, dry 173 86 42 21

0.73 lbs ai/acre, 2, 10, 30, dry and flooded NA 320 NA 78

0.73 lbs ai/acre, 2, 10, 55, dry and flooded 390 NA 95 NA

0.66 lbs ai/acre, 1, NA, 7 days, dry 74 38 18 9

0.89 lbs ai/acre, 1, NA, 7 days, dry 106 53 26 13

0.44 lbs ai/acre, 2, 10 days, 7 days, dry 88 45 22 11

0.44 lbs ai/acre, 2, 10 days,7 days, flooded NA 375 NA 92

MPP

1.46 lbs ai/acre, 1, NA, 7 days, dry 5.7 2.9 5.5 2.8

0.73 lbs ai/acre, 2, 10, 30, dry and flooded NA 88 NA 85

0.73 lbs ai/acre, 2, 10, 55, dry and flooded 183 NA 177 NA

0.66 lbs ai/acre, 1, NA, 7 days, dry 2.2 1.1 2.1 1.1
32

Use rate, Number of apps, retreatment interval, 

water holding period, application timing

Acute EDWC 

(μg/L)

Annual Average EDWC1

(μg/L)

4” 8” 4” 8”

0.89 lbs ai/acre, 1, NA, 7 days, dry 3.5 1.8 3.4 1.7

0.44 lbs ai/acre, 2, 10 days, 7 days, dry 3.0 1.5 2.9 1.5

0.44 lbs ai/acre, 2, 10 days,7 days, flooded NA 45 NA 44

1. Annual average EDWC calculated by taking acute EDWC and allowing it to degrade for 365 days, using the aerobic 

aquatic degradation half-life, and then taking the average value over the 365-day period.

8. References

FAO. 2000. Appendix 2. Parameters of pesticides that influence processes in the soil. In FAO 

Information Division Editorial Group (Ed.), Pesticide Disposal Series 8. Assessing Soil 

Contamination. A Reference Manual. Rome: Food & Agriculture Organization of the United 

Nations (FAO). Available at http://www.fao.org/DOCREP/003/X2570E/X2570E06.htm

FIFRA SAP. 2004. Refined (Level II) Terrestrial and Aquatic Models for Probabilistic and 

Ecological Assessment of Pesticides. March 30-April 2, 2004. 

http://www.epa.gov/scipoly/sap/meetings/2004/033004_mtg.htm

Hill, J.E., Dickey, D. 1998. Crop Profile for Rice in California. 

http://www.ipmcenters.org/CropProfiles/docs/carice.pdf

Hill, J.E., Roberts, S.R., Brandon, D.M., Scardaci, S.C., Willimas, J.F., Mutters, R.G. 1997. Rice 

Production in California Revised 1997. 

http://www.plantsciences.ucdavis.edu/uccerice/PRODUCT/prod.htm

Hill, J. E., Williams, J. F., Mutters, R. G., & Greer, C. A. 2006. The California rice cropping 

system: agronomic and natural resource issues for long-term sustainability. Paddy Water Environ, 

4, 13-19.

Lemaux, P. (date unknown). “LL601 Rice What Is It & What does It Mean?” Factsheet. 

http://ucbiotech.org/resources/factsheets/LibertyLink.pdf

Luo, Y. 2011. Report 263: Review and Evaluation of Pesticide Modeling Approaches in Rice 

Paddies. California Department of Pesticide Regulation, Environmental Monitoring Branch. June 

29, 2011. http://www.cdpr.ca.gov/docs/emon/surfwtr/protocols/study263protocol.pdf

Shipp, M. 2002. Crop Profile for Rice in Louisiana. 

http://www.ipmcenters.org/CropProfiles/docs/LArice.pdf

Univeristy of Arkansas. 2006. Rice Production Handbook. University of Arkansas, Division of 

Agriculture Cooperative Extension Service. 

http://www.uaex.edu/Other_Areas/publications/HTML/MP-192.asp
33

USDA. 2010. Field Crops Usual Planting and Harevsting Dates. United States Department of 

Agriculture, National Agricultural Statistics Service. October 29, 2010.

http://usda.mannlib.cornell.edu/usda/current/planting/planting-10-29-2010.pdf

USEPA. 2001. Total Maximum Daily Load (TMDL) For the Pesticide Fipronil

in the Mermentau Basin for the Following Subsegments: Bayou Plaquemine Brule (050201),

Mermentau River (050401), Bayou Queue de Tortue (050501), Bayou Chene (050603),

Including the 303(d) Listed Subsegment Bayou Des Cannes (050101). USEPA Region 6. 

September 13, 2001

USEPA. 2002. Memorandum, Subject: PP#s - 0F06210 (transgenic rice), 0F06140 (transgenic 

cotton), and 2E06404 (blueberry) - Glufosinate Ammonium in/on Transgenic rice, Transgenic 

Cotton, and Blueberry. Health Effects Division (HED) Metabolism Assessment Review 

Committee (MARC) Decision Document. DP Barcode D282757. Chemical 128850. Case 

292945. Submission S596735. From: Tom Bloem, Chemist, Registration Action Branch 1 

(RAB1)/HED (7509C) and PV Shah, Ph.D., Toxicologist, RAB1/HED (7509C). May 9, 2002

USEPA. 2004. Exposure Analysis Modeling System (EXAMS): User Manual and System 

Documentation. EPA/600/R-00/81-023. May 2004. Ecosystems Research Division. United 

States Environmental Protection Agency. Available at 

http://www.epa.gov/ceampubl/swater/exams/exams29804/EXAMREVG.PDF (Accessed 

September 2, 2011).

USEPA 2007. Guidance for Tier I Estimation of Aqueous Pesticide Concentrations in Rice 

Paddies. Memo from S. Bradbury to Environmental Fate and Effects Division; May 8, 2007. 

U.S. Environmental Protection Agency, Office of Prevention, Pesticides and Toxic Substances, 

Office of Pesticide Programs, Environmental Fate and Effects Division, Washington, DC. 

Available at http://www.epa.gov/oppefed1/models/water/index.htm#rice (accessed September 

27, 2010).

USEPA. 2009a. Potential Risks of Thiobencarb Use to Federally Threatened California Redlegged Frog (Rana aurora draytonii) and Delta Smelt (Hypomesus transpacificus). October 19, 

2009. Pesticide Effects Determinations. U.S. Environmental Protection Agency, Office of 

Prevention, Pesticides, and Toxic Substances. Environmental Fate and Effects Division. Online 

at: http://www.epa.gov/espp/litstatus/effects/redleg-frog/thiobencarb/analysis.pdf

USEPA. 2009b. Guidance for Selecting Input Parameters in Modeling the Environmental Fate 

and Transport of Pesticides, Version 2.1. U.S. Environmental Protection Agency, Office of 

Prevention, Pesticides and Toxic Substances, Office of Pesticide Programs, Environmental Fate 

and Effects Division, October 22, 2009. Online at: 

http://www.epa.gov/oppefed1/models/water/input_parameter_guidance.htm

USEPA, 2009c. Guidance on the Development, Evaluation, and Application of Environmental 

Models. EPA/100/K-09/003 March 2009. US Environmental Protection Agency, Washington, 

DC.
34

USEPA. 2011. Internal Memorandum from Biological and Economic Analysis Division (BEAD) 

to EFED Regarding Liberty Link Rice Production. August 22, 2011.

USEPA. 2012. Development and Use of Percent Cropped Area and Percent Turf Area 

Adjustment Factors in Drinking Water Exposure Assessments: 2012 Update. U.S. Environmental 

Protection Agency, Office of Prevention, Pesticides and Toxic Substances, Office of Pesticide 

Programs, Environmental Fate and Effects Division, September 9, 2010. Online at:

http://www.epa.gov/oppefed1/models/water/pca_adjustment_dwa.html

MRIDS

MRID: 40345656

Goerlitz, G.; Kloeckner, C.; Eyrich, U. (1986) Abiotic Hydrolysis as a Function of pH and 

Amendment and Separation of Potential Hydrolysis Products of HOE 039866 from the Active 

Ingredient by HPLC: Project Nos. (B)277/85 and (B)110/86. Unpublished study prepared by

Hoechst AG. 48 p.

MRID: 40345659

Gildemeister, H.; Jordan, H.; Stumpf, K.; et al. (1987) Aerobic Soil Metabolism Studies with 

HOE 039866-[carbon 14] and Amend- ment and Degradation in Soil Study with HOE 061517-

[carbon 14]: Project Nos. CB066/85, CB060/86 and CB065/86. Unpublished study prepared by

Hoechst AG. 152 p.

MRID: 40345660

Gildemeister, H.; Jordan, H.; Schink, C. (1987) HOE 039866-[carbon 14]: Aerobic Aquatic 

Metabolism Study: Project No. CB064/86. Unpublished study prepared by Hoechst AG. 56 p.

MRID: 40345662

Goerlitz, G. (1985) Adsorption/Desorption in the System--Soil/Water for HOE 039866 and HOE 

061517: Project Nos. CP055/85 and CP062/ 85. Unpublished study prepared by Hoechst AG. 

81 p.

MRID: 41323115

Stumpf, K. (1989) HOE 039866-Carbon 14: Photodegradation in Water at pH 5, 7, and 9: Lab 

Project Number: A40989: CB/89/88. Unpublished study prepared by Hoechst AG. 73 p.

MRID: 41323118

Stumpf, K. (1989) HOE 061517-Carbon 14, Metabolite of HOE 039866: Degradation in Aerobic 

Conditions at Application Rates of 0.5 and 1.0 mg/kg: Lab Project Number: CB007/88: A41198. 

Unpublished study prepared by Hoechst AG. 59 p.

MRID: 44032901

Miklautz, H. (1995) The Vapor Pressure of Glufosinate-Ammonium (Hoe 039866) at 25 

(degrees) C: Lab Project Number: 0910: A55227: APC 126/95. Unpublished study prepared by

Schering AG, Institute of Physical Chemistry. 16 p. 
35

MRID: 45204401

Stumpf, K. (1994) Aerobic Aquatic Metabolism of (carbon-14)-Labelled Glufosinate-ammonium 

in Two Water Sediment Systems at Different Application Rates: 1st Amendment to Report 

CB90/109: Lab Project Number: CB90/109: CB90/109.A01: A53137. Unpublished study

prepared by Hoechst Schering AgrEvo GmbH. 60 p. 

MRID: 45204402

Stumpf, K. (1994) Aerobic Aquatic Metabolism of (carbon-14)-Labelled Glufosinate-ammonium 

in Two Water Sediment Systems at Different Application Rates: Lab Project Number: 

CB90/109: A53136. Unpublished study prepared by Hoechst Schering AgrEvo GmbH. 75 p.

MRID: 45204403

Singer, S. (2000) Aquatic Field Dissipation of Glufosinate-Ammonium Following Application of 

Liberty at Highest Recommended Label Rates for Rice in Louisiana and California-USA, 1997: 

Lab Project Number: BK-97R-09: B002515: BK97R009. Unpublished study prepared by

Aventis CropScience. 11 p.

MRID: 46258601

Citation: Stupp, H. (2003) Degradation and Metabolism of Glufosinate Ammonium in Soil 

Under Anaerobic Conditions. Project Number: M1261285/5, MEF/367/03, C038925. 

Unpublished study prepared by Bayer Ag, Institute of Product Info. 62 p.
36

Appendix A. SDWIS Results

Counties that grow rice were identified using the USDA National Agricultural Statistics Service 

Quick Stats Data (http://quickstats.nass.usda.gov/results/6432EC45-FA6F-3DE6-A48F98F1917AAEA8). The Safe Drinking Water Information System (SDWIS) maintained by the 

EPA (http://www.epa.gov/enviro/facts/sdwis/search.html) was then used to find all drinking 

water intakes in those counties. Finally, the drinking water intakes were filtered to identify the 

drinking water sources that use surface water as a source of drinking water. These results are 

summarized in Table A2. The exact sources of drinking water in Butte County California and in 

Randolph County Arkansas were determined using the SDWIS system and finding information 

on the drinking water sources on the internet. These results are shown in Table A1. 

Table A1. Sources of Drinking Water for the Drinking Water Systems Reported to Have a 

Surface Water Source in Butte County, CA and Randolph County, AR.

Water source Water System Name Source of water source

Butte County, CA

West branch of feather 

river

CAL-WATER SERVICE CO.-

OROVILLE

http://calwater.com/your_district/index.php?

district=oro&Zip=&Submit=Click+to+show

+your+district

Lake Oroville DEL ORO WATER CO.-LIME 

SADDLE MARINA

http://docs.cpuc.ca.gov/published/Final_resol

ution/98533.htm

Stirling City Creek DEL ORO WATER CO.-STIRLING 

BLUFFS

http://drinc.ca.gov:8080/DWW/JSP/WaterSy

stemDetail.jsp?tinwsys_is_number=107&tin

wsys_st_code=CA&wsnumber=CA0410018

Magalia Reservoir PARADISE IRRIGATION DISTRICT

http://drinc.ca.gov:8080/DWW/JSP/WaterSy

stemDetail.jsp?tinwsys_is_number=99&tinw

sys_st_code=CA&wsnumber=CA0410007

Bangor Ditch SFWP-BANGOR

http://drinc.ca.gov:8080/DWW/JSP/WaterSy

stemDetail.jsp?tinwsys_is_number=103&tin

wsys_st_code=CA&wsnumber=CA0410012

Feather River/ Slate 

Creek SFWP-MINERS RANCH http://www.southfeather.com/Board/2007/112707_MRTP_Expansion.pdf

Concow Reservoir THERMALITO WATER & SEWER 

DISTRICT

http://www.buttecounty.net/~/media/County

%20Files/AdminOffice/Public%20Internet/G

rand%20Jury%20Documents/GrandJury_080

9/Grand%20Jury%20Report%20FY%2008-

09%20-%20Sec%2014.ashx

Randolph County, AR

Black River in 

Pocahontas, AR POCAHONTAS WATERWORKS

http://www.healthy.arkansas.gov/programsSe

rvices/environmentalHealth/Engineering/Doc

uments/Reports/FormsAndMaterials/DraftAr

kansasSourceWaterAssessmentPlan.pdf
37

Table A2. Sources of Drinking Water with a Surface Water Source in United States 

Counties that Grow Rice.

Water System Name County(s) 

Served

Population 

Served

Primary Water 

Source Type

System 

Status

Water 

System ID

CAL-WATER SERVICE CO.-

OROVILLE

BUTTE 9427 Surface water Active CA0410005

DEL ORO WATER CO.-LIME 

SADDLE MARINA

BUTTE 128 Surface water Active CA0405001

DEL ORO WATER CO.-

STIRLING BLUFFS

BUTTE 313 Surface water Active CA0410018

PARADISE IRRIGATION 

DISTRICT

BUTTE 26299 Surface water Active CA0410007

SFWP-BANGOR BUTTE 63 Surface water Active CA0410012

SFWP-MINERS RANCH BUTTE 22348 Surface water Active CA0410006

THERMALITO WATER & 

SEWER DISTRICT

BUTTE 9513 Surface water Active CA0410008

LASSEN VNP -

HEADQUARTERS

TEHAMA 54 Surface water Active CA5210503

MINERAL COUNTY WATER 

DISTRICT

TEHAMA 109 Surface water Active CA5200503

PASKENTA COMM. 

SERVICES DIST.

TEHAMA 120 Surface water Active CA5200534

SALT CREEK 

CONSERVATION CAMP

TEHAMA 120 Surface water Active CA5210801

LASSEN VNP - BUTTE LAKE TEHAMA 240 Surface water Active CA5210500

LASSEN VNP - LOST CREEK TEHAMA 340 Surface water Active CA5210504

LASSEN VNP - MANZANITA 

LAKE

TEHAMA 600 Surface water Active CA5210505

LASSEN VNP -

SOUTHWEST/CHALET

TEHAMA 145 Surface water Active CA5210501

LASSEN VNP - SUMMIT 

LAKE

TEHAMA 250 Surface water Active CA5210506

ELK CREEK COMMUNITY 

S.D.

GLENN 300 Surface water Active CA1100616

COLUSA CO. SERVICE 

AREA #1-CENTURY RANCH

COLUSA 120 Surface water Active CA0600012

FOUTS SPRINGS YOUTH 

FACILITY

COLUSA 120 Surface water Active CA0600041

BULLARD S BAR REC FAC 

WTR SYS

YUBA 2200 Surface water Active CA5800814

CYO CAMP PENDOLA YUBA 130 Surface water Active CA5800838

CAMP FAR WEST RESORT YUBA 4000 Surface water Active CA5800801

CAMPTONVILLE COMM. 

SERV. DIST

YUBA 300 Surface water Active CA5800924
38

Water System Name County(s) 

Served

Population 

Served

Primary Water 

Source Type

System 

Status

Water 

System ID

CATHEDRAL OAKS YUBA 140 Surface water Active CA5800803

NEVADA ID - SMARTVILLE YUBA 109 Surface water Active CA5810005

NORTH YUBA WATER 

DISTRICT

YUBA 3500 Surface water Active CA5810006

CANYON CREEK RESORT YOLO 200 Surface water Active CA5700608

MURPHY S SALOON SACRAMENTO 320 Active CA3400431

CARMICHAEL WATER 

DISTRICT

SACRAMENTO 40000 Surface water Active CA3410004

FOLSOM STATE PRISON SACRAMENTO 9500 Surface water Active CA3410032

GOLDEN STATE WATER 

CO. - CORDOVA

SACRAMENTO 48909 Surface water Active CA3410015

RANCHO MURIETA 

COMMUNITY SERVI

SACRAMENTO 6060 Surface water Active CA3410005

SAN JUAN WATER 

DISTRICT

SACRAMENTO 33792 Surface water Active CA3410021

SCWA -

LAGUNA/VINEYARD

SACRAMENTO 153701 Surface water Active CA3410029

H & H MARINA WS SAN JOAQUIN 30 Surface water Active CA3900769

JIMMYS MARKET WATER 

SYSTEM

SAN JOAQUIN 25 Active CA3902179

MOOSE OUTDOOR 

SPORTSMAN CLUB

SAN JOAQUIN 25 Active CA3901478

ST FRANCIS YACHT CLUB SAN JOAQUIN 100 Surface water Active CA3901010

LITTLE POTATO SLOUGH 

MUTUAL

SAN JOAQUIN 350 Surface water Active CA3910022

MOUNTAIN HOUSE 

COMMUNITY SERVICES 

DIST.

SAN JOAQUIN 7250 Surface water Active

CA3910027

NORTHERN CALIF YOUTH 

CORR. CENTER

SAN JOAQUIN 2488 Surface water Active CA3910802

STOCKTON EAST WATER 

DISTRICT

SAN JOAQUIN 50 Surface water Active CA3910006

BEAR VALLEY YMCA CAMP PLACER 80 Active CA3107332

CAMP WINTHERS PLACER 100 Surface water Active CA3104449

FIR CRAGS SUMMER 

HOME TRACT

PLACER 50 Surface water Active CA3107317

FRENCH MEADOWS 

NORTH SHORE

PLACER 1000 Surface water Active CA3100085

FRENCH MEADOWS 

SOUTH SHORE

PLACER 1000 Surface water Active CA3100084
39

Water System Name County(s) 

Served

Population 

Served

Primary Water 

Source Type

System 

Status

Water 

System ID

FULDA FLAT CAMP PLACER 125 Surface water Active CA3107316

SKY MOUNTAIN 

CHRISTIAN CAMP

PLACER 25 Surface water Active CA3104457

SNOWFLOWER PLACER 1000 Surface water Active CA3103288

SUGAR PINE RESERVIOR PLACER 25 Surface water Active CA3103261

AGATE BAY WATER 

COMPANY

PLACER 2500 Surface water Active CA3110012

ALPINE MEADOWS 

PROPERTY OWNERS ASSO

PLACER 250 Surface water Active CA3100041

CALAM - WEST PLACER PLACER 3148 Surface water Active CA3110150

CHRISTIAN VALLEY PARK 

CSD

PLACER 2000 Surface water Active CA3110034

DUTCH FLAT MUTUAL PLACER 250 Surface water Active CA3100058

FORESTHILL PUBLIC 

UTILITY DIST

PLACER 5500 Surface water Active CA3110003

FULTON WATER 

COMPANY

PLACER 500 Surface water Active CA3110015

HEATHER GLEN 

COMMUNITY SERVICE 

DIST

PLACER 250 Surface water Active

CA3100038

LAKE FOREST UTILITY 

COMPANY

PLACER 50 Surface water Active CA3110032

MEADOW VISTA CWD PLACER 3640 Surface water Active CA3110009

NEVADA ID - NORTH 

AUBURN

PLACER 6320 Surface water Active CA3110026

NORTH EDEN VALLEY PLACER 45 Surface water Active CA3100019

NORTH TAHOE PUD -

DOLLAR COVE

PLACER 800 Surface water Active CA3110036

NORTH TAHOE PUD -

MAIN

PLACER 5000 Surface water Active CA3110001

NORTHSTAR C.S.D. PLACER 300 Surface water Active CA3110028

PLACER CWA - ALTA PLACER 875 Surface water Active CA3110024

PLACER CWA - APPLEGATE PLACER 215 Surface water Active CA3110050

PLACER CWA -

AUBURN/BOWMAN

PLACER 27199 Surface water Active CA3110005

PLACER CWA - COLFAX PLACER 2987 Surface water Active CA3110006

PLACER CWA - FOOTHILL PLACER 72584 Surface water Active CA3110025

PLACER CWA - MONTE 

VISTA

PLACER 59 Surface water Active CA3110124
40

Water System Name County(s) 

Served

Population 

Served

Primary Water 

Source Type

System 

Status

Water 

System ID

SHADY GLEN COMM 

WATER SYSTEM

PLACER 336 Surface water Active CA3100040

SIERRA LAKES COUNTY 

WATER DIST

PLACER 185 Surface water Active CA3110017

TAHOE CEDARS WATER 

COMPANY

PLACER 2775 Surface water Active CA3110013

TAHOE PARK WATER CO -

SKYLAND/NIELSEN

PLACER 50 Surface water Active CA3110049

TAHOE PARK WATER 

COMPANY

PLACER 750 Surface water Active CA3110018

TAHOE SWISS VILLAGE 

UTILITY

PLACER 300 Surface water Active CA3110042

WEIMAR WATER 

COMPANY

PLACER 900 Surface water Active CA3110035

FRANK RAINES PARK OHV STANISLAUS 26 Surface water Active CA5000243

KNIGHTS FERRY COMM. 

SVC. DIST.

STANISLAUS 85 Surface water Active CA5000008

SOUTH SAN JOAQUIN 

IRRIGATION DISTRICT

STANISLAUS 50 Surface water Active CA5010040

TURLOCK IRRIGATION 

DISTRICT

STANISLAUS 50 Surface water Active CA5010043

WESTERN HILLS WATER 

DISTRICT/DIABLO GRAN

STANISLAUS 3000 Surface water Active CA5010039

9-IRON WATER SYSTEM MERCED 90 Active CA2400222

CAL TRANS ERRECA REST 

AREA

MERCED 6150 Surface water Active CA2400057

CDPR FOUR RIVERS 

DISTRICT-BASALT

MERCED 470 Surface water Active CA2410303

CDPR FOUR RIVERS 

DISTRICT-SAN LUIS CREEK

MERCED 458 Surface water Active CA2410304

DRISCOLL STRAWBERRY MERCED 275 Active CA2400225

GONZALES FOOD FACILITY MERCED 60 Active CA2400233

DWR - SAN LUIS DIVISION 

O&M

MERCED 650 Surface water Active CA2410950

LOS BANOS FOODS, INC. MERCED 69 Surface water Active CA2400107

SAN JOAQ.VALLEY 

NAT.CEMETERY

MERCED 25 Surface water Active CA2400200

SAN LUIS HILLS MERCED 300 Surface water Active CA2400209

SANTA NELLA COUNTY 

WATER DISTRICT

MERCED 1500 Surface water Active CA2410018

ANDERSON CLAYTONSILVER CREEK GINSFRESNO 29 Surface water Active CA1000510
41

Water System Name County(s) 

Served

Population 

Served

Primary Water 

Source Type

System 

Status

Water 

System ID

BEAR CREEK WATER 

IMPROVEMENT

FRESNO 100 Surface water Active CA1000003

BSA/CAMP OLJATO FRESNO 250 Surface water Active CA1000156

CAMP FRESNO WATER 

SYSTEM

FRESNO 250 Surface water Active CA1000170

CAMP SIERRA FRESNO 180 Surface water Active CA1000010

CEDAR CREST RESORT FRESNO 100 Surface water Active CA1000164

COKE HALLOWELL CENTER FRESNO 25 Surface water Active CA1000586

HUCKLEBERRY WATER 

DEVELOPMENT

FRESNO 200 Surface water Active CA1000050

MONO HOT SPRINGS 

RESORT

FRESNO 85 Surface water Active CA1000308

NPS-CEDAR GRV/SHEEP 

CR

FRESNO 2900 Surface water Active CA1010500

PANOCHE RANCH - FRANK 

LOGOLUSO FARMS

FRESNO 300 Surface water Active CA1000588

PG&E BALCH CAMP FRESNO 17 Surface water Active CA1009129

PG&E MARMOT ROCK 

CAMPGROUND

FRESNO 40 Surface water Active CA1000392

RANCHERIA WATER & 

IMPRMNT ASSN

FRESNO 75 Surface water Active CA1000067

CON AGRA FOODS, 

CULINARY BUSINESS F

FRESNO 25 Surface water Active CA1000536

COTTON WEST AG 

MANAGEMENT

FRESNO 50 Surface water Active CA1000360

HARRIS RANCH FRESNO 275 Surface water Active CA1000214

I-5 AND HWY 198 REST 

AREA

FRESNO 225 Surface water Active CA1000178

I-5 AND PANOCHE 

DEVELOPMENT

FRESNO 85 Surface water Active CA1000177

LOS GATOS TOMATO 

PRODUCTS

FRESNO 100 Surface water Active CA1000490

OLAM SPICES AND 

VEGETABLES INC.

FRESNO 125 Surface water Active CA1009091

VIE-DEL COMPANY FRESNO 60 Active CA1000593

WESTLANDS WATER 

DISTRICT

FRESNO 48 Surface water Active CA1000361

BIG CREEK COMMUNITY 

SERV DIST

FRESNO 150 Surface water Active CA1000005

BRITZ/COLUSA FRESNO 106 Surface water Active CA1009023

BRITZ/FIVE POINT SYSTEM FRESNO 150 Surface water Active CA1009179
42

Water System Name County(s) 

Served

Population 

Served

Primary Water 

Source Type

System 

Status

Water 

System ID

CASACA VINEYARDS FRESNO 25 Surface water Active CA1000175

COIT RANCH 

CORPORATION

FRESNO 90 Surface water Active CA1009131

FARMING D FRESNO 100 Surface water Active CA1009147

FCSA #30/EL PORVENIR FRESNO 130 Surface water Active CA1000019

FCSA #32/CANTUA CREEK FRESNO 230 Surface water Active CA1000359

FCSA #34/BRIGHTON 

CREST

FRESNO 212 Surface water Active CA1000484

FCSA #49/ FIVE POINTS FRESNO 450 Surface water Active CA1000546

FCWWD #38/SKY 

HARBOUR

FRESNO 150 Surface water Active CA1000041

FRESNO CO WATER 

WORKS DIST 18

FRESNO 860 Surface water Active CA1010051

HAMMONDS RANCH FRESNO 50 Surface water Active CA1009281

HARRIS FARMS CAMP C 

#501-523

FRESNO 300 Surface water Active CA1009027

HARRIS FARMS SOUTH 

#101-144

FRESNO 160 Surface water Active CA1009028

HARRIS FARMS/HORSE 

BARN

FRESNO 100 Surface water Active CA1000213

HARRIS FEEDING 

COMPANY

FRESNO 225 Surface water Active CA1009078

HOULDING FARMS FRESNO 50 Surface water Active CA1009051

HUME LAKE CHRISTIAN 

CAMPS, INC

FRESNO 341 Surface water Active CA1010013

PANOCHE WATER 

DISTRICT

FRESNO 27 Surface water Active CA1000345

PAPPAS & CO (COALINGA) FRESNO 50 Surface water Active CA1009006

PAPPAS & COMPANY 

(MENDOTA)

FRESNO 25 Surface water Active CA1009039

PECK RANCH FRESNO 42 Surface water Active CA1009232

PILIBOS BROTHERS RANCH 

(SIMONIAN FARMS)

FRESNO 25 Surface water Active CA1009035

SAN ANDREAS FARMS FRESNO 40 Surface water Active CA1009258

SCE/BIG CREEK 

POWERHOUSE #1

FRESNO 200 Surface water Active CA1009111

TERRA LINDA FARMS FRESNO 40 Surface water Active CA1009222

VAQUERO FARMS FRESNO 70 Surface water Active CA1009172

WESTSIDE HARVESTING FRESNO 25 Surface water Active CA1009214
43

Water System Name County(s) 

Served

Population 

Served

Primary Water 

Source Type

System 

Status

Water 

System ID

VEOLIA PORT ARTHUR 

FACILITY

JEFFERSON 250 Surface water Active TX1230082

CITY OF BEAUMONT 

WATER UTILITY DEPT

JEFFERSON 125000 Surface water Active TX1230001

CITY OF GROVES JEFFERSON 15733 Surface water Active TX1230012

CITY OF NEDERLAND JEFFERSON 20935 Surface water Active TX1230006

CITY OF NOME JEFFERSON 870 Surface water Active TX1230039

CITY OF PORT ARTHUR JEFFERSON 57755 Surface water Active TX1230009

CITY OF PORT NECHES JEFFERSON 15222 Surface water Active TX1230010

JEFFERSON COUNTY WCID 

10

JEFFERSON 5602 Surface water Active TX1230003

WEST JEFFERSON COUNTY 

MWD

JEFFERSON 8007 Surface water Active TX1230021

NATCHITOCHES WATER 

SYSTEM

NATCHITOCHES 30000 Surface water Active LA1069007

SANDY POINT 480 WATER 

SYSTEM

NATCHITOCHES 458 Surface water Active LA1069013

LAKE BRUIN WATER 

SYSTEM

TENSAS 912 Surface water Active LA1107002

NEWELLTON WATER 

SYSTEM

TENSAS 1596 Surface water Active LA1107003

TENSAS WATER DISTRICT 

ASSOCIATION

TENSAS 2910 Surface water Active LA1107009

MOUNTAIN PURE LLC PULASKI 30 Surface water Active ARN000094

CENTRAL ARKANSAS 

WATER

PULASKI 313588 Surface water Active AR0000465

POCAHONTAS 

WATERWORKS

RANDOLPH 6798 Surface water Active AR0000474

CITY OF ANAHUAC CHAMBERS 2880 Surface water Active TX0360001

LOWER NECHES VALLEY 

AUTHORITY

CHAMBERS 10 Surface water Active TX0360112

TBCD WEST TREATMENT 

PLANT

CHAMBERS 5481 Surface water Active TX0360030

TBCD WINNIE STOWELL CHAMBERS 6270 Surface water Active TX0360002
44

Appendix B. Estimation of Heat of Henry Using EPISuite

The Heat of Henry or enthalpy of salvation is the enthalpy of phase change from aqueous 

solution to air solution (Joules/mole). This enthalpy can be approximated from the enthalpy of 

vaporization (Schwarzenbach et al., 2005), estimates of which can be obtained from EPISuite 

among other sources.

To estimate the enthalpy of vaporization using EPISuite software, open the software, then select 

the HENRYWIN subprogram on the left of the EPI Suite screen. On the top menu of the 

HENRYWIN window item, select the ShowOptions, then select Show Temperature Variation 

with Results. Enter the chemical name of interest and then push the Calculate button. EPI Suite 

will give the temperature variation results in the form of an equation: HLC (atm-m3/mole) = 

exp(A-(B/T)) {T in K}. The enthalpy of vaporization is B (in Kelvin). The enthalpy of 

solvation (e.g., heat of Henry in Joules/mol) is calculated by multiplying the gas constant (8.314 

J/mol-K) by the enthalpy of vaporization for the compound (K).

For glufosinate and MPP, the heat of Henry (49,884 J/mol) was calculated by multiplying the gas 

constant (8.314 J/mol-K) by the compounds’ enthalpy of vaporization (6,000 K) estimated by

HenryWin (v3.20).

The printouts from HenryWin for glufosinate and MPP are presented below, with the 

temperature variation results highlighted in red

 Bond Est : 5.26E-016 atm-m3/mole (5.33E-011 Pa-m3/mole)

 Group Est: Incomplete

SMILES : O=P(C)(O)CCC(N)C(=O)O

CHEM : Glufosinate

MOL FOR: C5 H12 N1 O4 P1 

MOL WT : 181.13

--------------------------- HENRYWIN v3.20 Results --------------------------

Henry LC Temperature Variation:

 Slope Source: Aliphatic acid slope analogy

 HLC (atm-m3/mole) = exp(-15.0579 - (6000/T)) {T in deg K}

 Temp (C) atm-m3/mole unitless Pa-m3/mole

 -------- ----------- -------- ----------

 0 8.34E-017 3.72E-015 8.45E-012 

 5 1.24E-016 5.42E-015 1.25E-011 

 10 1.81E-016 7.8E-015 1.84E-011 

 15 2.62E-016 1.11E-014 2.65E-011 

 20 3.73E-016 1.55E-014 3.78E-011 

 25 5.26E-016 2.15E-014 5.33E-011 

 30 7.33E-016 2.95E-014 7.43E-011 

 35 1.01E-015 4E-014 1.02E-010 

 40 1.38E-015 5.37E-014 1.4E-010 

 45 1.86E-015 7.14E-014 1.89E-010 

 50 2.49E-015 9.41E-014 2.53E-010 

----------+---------------------------------------------+---------+----------

 CLASS | BOND CONTRIBUTION DESCRIPTION | COMMENT | VALUE

----------+---------------------------------------------+---------+----------

HYDROGEN | 8 Hydrogen to Carbon (aliphatic) Bonds | | -0.9574

HYDROGEN | 2 Hydrogen to Oxygen Bonds | | 6.4635

HYDROGEN | 2 Hydrogen to Nitrogen Bonds | | 2.5670
45

FRAGMENT | 2 C-C | | 0.2326

FRAGMENT | 1 C-CO | | 1.7057

FRAGMENT | 1 C-N | | 1.3010

FRAGMENT | 1 CO-O | | 0.0714

FRAGMENT | 2 C-P | | 1.5571

FRAGMENT | 1 O-P | | 0.3930

FRAGMENT | 1 O=P | | 1.6334

FACTOR | 1 -C(=O)-C-N group | | -1.3000

----------+---------------------------------------------+---------+----------

RESULT | BOND ESTIMATION METHOD for LWAPC VALUE | TOTAL | 13.667

----------+---------------------------------------------+---------+----------

HENRYs LAW CONSTANT at 25 deg C = 5.26E-016 atm-m3/mole

 = 2.15E-014 unitless

= 5.33E-011 Pa-m3/mole

--------+-----------------------------------------------+------------+--------

 | GROUP CONTRIBUTION DESCRIPTION | COMMENT | VALUE 

--------+-----------------------------------------------+------------+--------

 | 1 CH2 (C)(C) | | -0.15

 | 1 CO (C)(O) | | 4.09

 | 1 O-H (CO) | | 1.45

 | 1 NH2 (C) | | 4.15

 | MISSING Value for: P (C)(O)(C)(=O)

 | MISSING Value for: CH3 (P)

 | MISSING Value for: O-H (P)

 | MISSING Value for: CH2 (C)(P)

 | MISSING Value for: CH (C)(CO)(N)

--------+-----------------------------------------------+------------+--------

RESULT | GROUP ESTIMATION METHOD for LOG GAMMA VALUE | INCOMPLETE | 9.54

--------+-----------------------------------------------+------------+--------

------------------------------------------------------------------------------

Heat of Henry, Glufosinate-ammonium = 8.314 x 6000 = 49,884 J/mol

SMILES : O=P(C)(O)CCC(=O)O

CHEM : MPP

MOL FOR: C4 H9 O4 P1 

MOL WT : 152.09

--------------------------- HENRYWIN v3.20 Results --------------------------

Henry LC Temperature Variation: 

 Slope Source: Aliphatic acid slope analogy

 HLC (atm-m3/mole) = exp(-9.1525 - (6000/T)) {T in deg K}

 Temp (C) atm-m3/mole unitless Pa-m3/mole

 -------- ----------- -------- ----------

 0 3.06E-014 1.37E-012 3.1E-009 

 5 4.54E-014 1.99E-012 4.6E-009 

 10 6.65E-014 2.86E-012 6.74E-009 

 15 9.6E-014 4.06E-012 9.73E-009 

 20 1.37E-013 5.69E-012 1.39E-008 

 25 1.93E-013 7.89E-012 1.96E-008 

 30 2.69E-013 1.08E-011 2.73E-008 

 35 3.71E-013 1.47E-011 3.76E-008 

 40 5.06E-013 1.97E-011 5.13E-008 

 45 6.84E-013 2.62E-011 6.93E-008 

 50 9.16E-013 3.45E-011 9.28E-008 

----------+---------------------------------------------+---------+----------

 CLASS | BOND CONTRIBUTION DESCRIPTION | COMMENT | VALUE

----------+---------------------------------------------+---------+----------
46

HYDROGEN | 7 Hydrogen to Carbon (aliphatic) Bonds | | -0.8377

HYDROGEN | 2 Hydrogen to Oxygen Bonds | | 6.4635

FRAGMENT | 1 C-C | | 0.1163

FRAGMENT | 1 C-CO | | 1.7057

FRAGMENT | 1 CO-O | | 0.0714

FRAGMENT | 2 C-P | | 1.5571

FRAGMENT | 1 O-P | | 0.3930

FRAGMENT | 1 O=P | | 1.6334

----------+---------------------------------------------+---------+----------

RESULT | BOND ESTIMATION METHOD for LWAPC VALUE | TOTAL | 11.103

----------+---------------------------------------------+---------+----------

HENRYs LAW CONSTANT at 25 deg C = 1.93E-013 atm-m3/mole

 = 7.89E-012 unitless

= 1.96E-008 Pa-m3/mole

--------+-----------------------------------------------+------------+--------

 | GROUP CONTRIBUTION DESCRIPTION | COMMENT | VALUE 

--------+-----------------------------------------------+------------+--------

 | 1 CH2 (C)(CO) | | -0.15

 | 1 CO (C)(O) | | 4.09

 | 1 O-H (CO) | | 1.45

 | MISSING Value for: P (C)(O)(C)(=O)

 | MISSING Value for: CH3 (P)

 | MISSING Value for: O-H (P)

 | MISSING Value for: CH2 (C)(P)

--------+-----------------------------------------------+------------+--------

RESULT | GROUP ESTIMATION METHOD for LOG GAMMA VALUE | INCOMPLETE | 5.39

--------+-----------------------------------------------+------------+--------

------------------------------------------------------------------------------

Heat of Henry, MPP = 8.314 x 6000 = 49,884 J/mol

References

Schwarzenbach, R. P., Gschwend, P. M. and Imboden, D. M. (2005) Environmental Organic 

Chemistry, John Wiley & Sons, Inc., Hoboken, NJ
47

Appendix C. PFAM Default Values

The following default input parameters were used in the PFAM analysis. These parameters are 

located on the Physical tab of PFAM version 0.7.

Mass Transfer Coefficient [m/s] represents the mass transfer coefficient between the water 

column and the benthic zone. It accounts for all means of mass transport and is referenced to the 

surrogate driving force of aqueous concentration differences. It is a difficult parameter to 

measure. Literature and EPA’s own calibrations suggest a starting estimate of 10-8 m/s.

Leakage [m/d] represents the dissipation of the pesticide in the water column due to leakage of 

the water column through the benthic region. The model’s assumptions are that only aqueousphase pesticide leaks into the sediment, the leakage rate is constant, and only downward such 

that there is never leakage in the reverse direction (i.e., into the water column). The default 

value is 0 m/d.

Reference Depth [m] represents the depth that aquatic measurements were made when 

determining factors such as suspended solids, biota, and DOC [m]. This usually will be set to 

0.1 m.

Benthic Depth [m] is the depth of the benthic compartment. This is another parameter that is 

difficult to estimate; however, literature and EPA’s own calibrations suggest a value of about 

0.05 m. 

Benthic Porosity [unitless] is the porosity of the benthic compartment, or pore space volume 

per total volume. The default value is set to that used by the EPA standard farm pond, 0.50.

Dry Bulk Density [g/cm3] is the rationally defined bulk density: [mass of sediment per total 

volume of sediment]. The default value is set to that used by the EPA standard farm pond, 1.35 

g/cm3.

Foc Water Column SS [unitless] is the fraction of organic carbon associated with suspended 

sediment. The default value is set to that used by the EPA standard farm pond, 0.04.

Foc Benthic [unitless] is the fraction of organic carbon associated with benthic sediment. The 

default value is set to that used by the EPA standard farm pond, 0.01.

SS [mg/L] is the suspended mass in the water column. The default value is set to that used by the 

EPA standard farm pond, 30 mg/L. 

Water Column DOC [mg/L] represents the dissolved organic carbon concentration in the water 

column. The default value is set to that used by the EPA standard farm pond, 5.0 mg/L. This 

parameter only affects the photolysis rate.

Chlorophyll, CHL [mg/L] represents the chlorophyll concentration in the water column. The 

default value is set to that used by the EPA standard farm pond, 0.005 mg/L. This parameter only

affects the photolysis rate.
48

Dfac [unitless] is a parameter used in the model EXAMS. It represents the ratio of the optical 

path length to vertical depth. The default value is set to1.19 as suggested by EXAMS 

documentation.

Q10 [unitless] is the Q10 value for metabolism. The default value is 2, which is a typical value.
49

Appendix D. Example PFAM Outputs

Without Index Reservoir (pp1 file)

90th Percentile concentrations, derived from the PFAM pp1 files, were developed using the 

following process:

1. Open file in Notepad (or any other word processing software.

2. Search for the term “max”.

3. Copy information from Line 11 (line starting with ”Event #”) to blank line just above “max”.

4. Copy text into blank Excel spreadsheet.

5. Select Data->Text to Columns menu/button option.

6. Select Fixed Width in pop-up box and hit Next button. 

7. Remove extra delineations in Dry Field Runoff by double-clicking lines and select Finish button.

8. Insert a column to the right of the Date (column B) and copy the following function “=year(b3)” 

into all of the cells in column C. Format column C as “General”. Insert title “Year” into cell C2.

9. Highlight data in columns C through F and select Insert->Pivot Table menu/button.

10. Click Existing Worksheet radio button and select as the Location “h2”

11. In Pivot Table Field List, drag Year to Row Labels, drag Type to Row Labels and drag 

Conc1(ug/L) to Values boxes.

12. Click on Sum of Conc1, select Change Value Settings, and change to Max. Close Pivot Table 

Field List.

13. Click the arrow to the right of Row Labels selection and change Year to Type in the drop down 

list. Click on the check box for “dry field runoff” to deselect it and hit Ok button.

14. Highlight the 1961 cell and right mouse click on it. Select Expand/Collapse->Collapse Entire 

Field

15. Highlight the Row Labels and click on the Filters button. Select the More Sort Options... menu 

and click on the Descending (Z to A) by: radio button. From the active pull-down menu, select 

Max of Conc. This should sort the list from highest to lowest concentration.

16. Use the MSExcel Percentile function to estimate the 90th percentile

(=Percentile(Range_of_data,0.9)).

California, 1.46 lbs ai/A, 1 application to 4” depth paddy, dry application

*******************************************************************************

Part 1: Record of Water and Mass Releases

*******************************************************************************

Records for all events in which pesticide mass was released whether from

manual releases or from spill over from precipitation.

*******************************************************************************

Event# Date Release Released Released Released

 Type Volume(m3) Conc1(ug/L) Conc2(ug/L) 

 1 1/24/1961 dry field runoff 0.276E+04 0.000E+00 0.000E+00

 2 1/26/1961 dry field runoff 0.574E+04 0.000E+00 0.000E+00

 3 1/27/1961 dry field runoff 0.819E+04 0.000E+00 0.000E+00

 4 1/30/1961 dry field runoff 0.594E+04 0.000E+00 0.000E+00

 5 2/ 1/1961 dry field runoff 0.639E+04 0.000E+00 0.000E+00

 6 2/ 3/1961 dry field runoff 0.536E+04 0.000E+00 0.000E+00

 7 2/ 7/1961 dry field runoff 0.242E+03 0.000E+00 0.000E+00

 8 2/ 9/1961 dry field runoff 0.156E+04 0.000E+00 0.000E+00

 9 2/10/1961 dry field runoff 0.100E+04 0.000E+00 0.000E+00

 10 2/12/1961 dry field runoff 0.691E+02 0.000E+00 0.000E+00

 11 2/16/1961 dry field runoff 0.484E+03 0.000E+00 0.000E+00

 12 3/ 6/1961 dry field runoff 0.588E+03 0.000E+00 0.000E+00

 13 3/ 9/1961 dry field runoff 0.180E+04 0.000E+00 0.000E+00

 14 3/15/1961 dry field runoff 0.612E+04 0.000E+00 0.000E+00

 15 3/16/1961 dry field runoff 0.726E+03 0.000E+00 0.000E+00

 16 3/17/1961 dry field runoff 0.187E+04 0.000E+00 0.000E+00

 17 3/25/1961 dry field runoff 0.657E+03 0.000E+00 0.000E+00
50

 18 4/22/1961 dry field runoff 0.124E+04 0.000E+00 0.000E+00

 19 4/23/1961 dry field runoff 0.100E+04 0.000E+00 0.000E+00

 20 5/31/1961 manual release 0.336E+05 0.160E+03 0.374E+01

 21 9/17/1961 dry field runoff 0.760E+03 0.684E+01 0.227E-01

 22 11/20/1961 dry field runoff 0.829E+03 0.799E+00 0.359E-02

 23 11/21/1961 dry field runoff 0.553E+04 0.130E+00 0.540E-03

 24 11/26/1961 dry field runoff 0.356E+04 0.180E+00 0.821E-03

 25 11/30/1961 dry field runoff 0.802E+04 0.743E-01 0.342E-03

 26 12/ 1/1961 dry field runoff 0.677E+04 0.826E-01 0.352E-03

 27 12/ 2/1961 dry field runoff 0.363E+04 0.146E+00 0.624E-03

 28 12/ 3/1961 dry field runoff 0.165E+05 0.320E-01 0.137E-03

 29 12/19/1961 dry field runoff 0.346E+03 0.834E+00 0.400E-02

 30 1/13/1962 dry field runoff 0.726E+03 0.325E+00 0.166E-02

 31 1/20/1962 dry field runoff 0.736E+04 0.338E-01 0.175E-03

 32 2/ 7/1962 dry field runoff 0.242E+04 0.776E-01 0.419E-03

 33 2/ 8/1962 dry field runoff 0.764E+04 0.243E-01 0.126E-03

 34 2/ 9/1962 dry field runoff 0.484E+03 0.292E+00 0.151E-02

 35 2/10/1962 dry field runoff 0.194E+05 0.917E-02 0.481E-04

 36 2/11/1962 dry field runoff 0.132E+05 0.129E-01 0.671E-04

 37 2/13/1962 dry field runoff 0.238E+04 0.670E-01 0.366E-03

 38 2/14/1962 dry field runoff 0.480E+04 0.324E-01 0.170E-03

 39 2/15/1962 dry field runoff 0.117E+05 0.131E-01 0.687E-04

 40 2/16/1962 dry field runoff 0.567E+04 0.259E-01 0.136E-03

 41 2/17/1962 dry field runoff 0.276E+03 0.347E+00 0.182E-02

 42 2/19/1962 dry field runoff 0.256E+04 0.531E-01 0.295E-03

 43 3/ 1/1962 dry field runoff 0.311E+03 0.264E+00 0.152E-02

 44 3/ 2/1962 dry field runoff 0.245E+04 0.443E-01 0.246E-03

 45 3/ 6/1962 dry field runoff 0.442E+04 0.236E-01 0.137E-03

 46 3/ 7/1962 dry field runoff 0.314E+04 0.310E-01 0.171E-03

 47 3/23/1962 dry field runoff 0.933E+03 0.731E-01 0.447E-03

 48 4/28/1962 dry field runoff 0.449E+03 0.604E-01 0.435E-03

 49 5/31/1962 manual release 0.320E+05 0.168E+03 0.395E+01

 50 10/11/1962 dry field runoff 0.726E+03 0.547E+01 0.184E-01

 51 10/12/1962 dry field runoff 0.753E+04 0.578E+00 0.163E-02

 52 10/13/1962 dry field runoff 0.227E+05 0.184E+00 0.501E-03

 53 10/14/1962 dry field runoff 0.330E+05 0.120E+00 0.328E-03

 54 11/27/1962 dry field runoff 0.232E+04 0.490E+00 0.198E-02

 55 12/16/1962 dry field runoff 0.567E+04 0.141E+00 0.599E-03

 56 12/17/1962 dry field runoff 0.670E+04 0.113E+00 0.445E-03

 57 12/18/1962 dry field runoff 0.314E+04 0.227E+00 0.896E-03

 58 1/29/1963 dry field runoff 0.104E+03 0.168E+01 0.785E-02

 59 1/30/1963 dry field runoff 0.484E+04 0.810E-01 0.373E-03

 60 1/31/1963 dry field runoff 0.180E+05 0.213E-01 0.956E-04

 61 2/ 1/1963 dry field runoff 0.170E+05 0.219E-01 0.982E-04

 62 2/ 2/1963 dry field runoff 0.242E+03 0.945E+00 0.425E-02

 63 2/10/1963 dry field runoff 0.546E+04 0.588E-01 0.287E-03

 64 2/13/1963 dry field runoff 0.771E+04 0.394E-01 0.194E-03

 65 2/14/1963 dry field runoff 0.321E+04 0.869E-01 0.404E-03

 66 3/ 9/1963 dry field runoff 0.276E+03 0.440E+00 0.241E-02

 67 3/15/1963 dry field runoff 0.691E+03 0.194E+00 0.108E-02

 68 3/17/1963 dry field runoff 0.639E+04 0.234E-01 0.131E-03

 69 3/23/1963 dry field runoff 0.332E+04 0.388E-01 0.221E-03

 70 3/24/1963 dry field runoff 0.691E+03 0.151E+00 0.814E-03

 71 3/28/1963 dry field runoff 0.117E+05 0.100E-01 0.579E-04

 72 3/29/1963 dry field runoff 0.854E+04 0.128E-01 0.700E-04

 73 4/ 6/1963 dry field runoff 0.111E+04 0.774E-01 0.460E-03

 74 4/ 7/1963 dry field runoff 0.657E+04 0.136E-01 0.770E-04

 75 4/11/1963 dry field runoff 0.221E+04 0.362E-01 0.218E-03

 76 4/14/1963 dry field runoff 0.349E+04 0.218E-01 0.133E-03

 77 4/15/1963 dry field runoff 0.943E+04 0.777E-02 0.448E-04

 78 4/21/1963 dry field runoff 0.207E+03 0.189E+00 0.118E-02

 79 4/22/1963 dry field runoff 0.795E+03 0.677E-01 0.409E-03

 80 4/26/1963 dry field runoff 0.899E+03 0.563E-01 0.357E-03
51

 81 4/27/1963 dry field runoff 0.138E+03 0.197E+00 0.118E-02

 82 5/ 9/1963 dry field runoff 0.228E+04 0.181E-01 0.121E-03

 83 5/11/1963 dry field runoff 0.287E+04 0.137E-01 0.918E-04

 84 5/31/1963 manual release 0.331E+05 0.163E+03 0.371E+01

 85 9/13/1963 dry field runoff 0.346E+04 0.391E+01 0.110E-01

 86 10/11/1963 dry field runoff 0.297E+04 0.141E+01 0.486E-02

 87 10/12/1963 dry field runoff 0.235E+04 0.163E+01 0.447E-02

 88 10/16/1963 dry field runoff 0.131E+04 0.242E+01 0.847E-02

 89 11/ 3/1963 dry field runoff 0.176E+04 0.997E+00 0.375E-02

 90 11/ 5/1963 dry field runoff 0.546E+04 0.316E+00 0.119E-02

 91 11/ 6/1963 dry field runoff 0.546E+04 0.295E+00 0.962E-03

 92 11/14/1963 dry field runoff 0.138E+03 0.480E+01 0.185E-01

 93 11/15/1963 dry field runoff 0.760E+04 0.167E+00 0.610E-03

 94 11/16/1963 dry field runoff 0.588E+03 0.168E+01 0.575E-02

 95 11/20/1963 dry field runoff 0.791E+04 0.140E+00 0.548E-03

 96 11/21/1963 dry field runoff 0.380E+03 0.202E+01 0.707E-02

 97 11/24/1963 dry field runoff 0.629E+04 0.156E+00 0.614E-03

 98 12/ 9/1963 dry field runoff 0.207E+03 0.212E+01 0.863E-02

 99 12/20/1963 dry field runoff 0.183E+04 0.318E+00 0.132E-02

 100 12/21/1963 dry field runoff 0.104E+03 0.241E+01 0.939E-02

 101 12/25/1963 dry field runoff 0.176E+04 0.301E+00 0.126E-02

 102 1/14/1964 dry field runoff 0.829E+03 0.448E+00 0.197E-02

 103 1/18/1964 dry field runoff 0.933E+03 0.378E+00 0.168E-02

 104 1/20/1964 dry field runoff 0.249E+04 0.148E+00 0.661E-03

 105 1/21/1964 dry field runoff 0.214E+05 0.171E-01 0.724E-04

 106 1/22/1964 dry field runoff 0.584E+04 0.597E-01 0.252E-03

 107 1/23/1964 dry field runoff 0.138E+03 0.123E+01 0.519E-02

 108 1/29/1964 dry field runoff 0.691E+02 0.151E+01 0.692E-02

 109 1/30/1964 dry field runoff 0.311E+03 0.689E+00 0.310E-02

 110 2/16/1964 dry field runoff 0.691E+03 0.289E+00 0.140E-02

 111 3/ 2/1964 dry field runoff 0.435E+04 0.412E-01 0.210E-03

 112 3/12/1964 dry field runoff 0.142E+04 0.983E-01 0.517E-03

 113 3/23/1964 dry field runoff 0.276E+04 0.426E-01 0.233E-03

 114 4/ 1/1964 dry field runoff 0.111E+04 0.824E-01 0.466E-03

 115 4/ 2/1964 dry field runoff 0.276E+03 0.232E+00 0.124E-02

 116 5/31/1964 manual release 0.320E+05 0.168E+03 0.392E+01

 117 6/ 9/1964 dry field runoff 0.211E+04 0.298E+03 0.233E+00

 118 10/29/1964 dry field runoff 0.712E+04 0.306E+00 0.117E-02

 119 10/30/1964 dry field runoff 0.653E+04 0.309E+00 0.997E-03

 120 11/ 2/1964 dry field runoff 0.622E+03 0.246E+01 0.955E-02

 121 11/ 3/1964 dry field runoff 0.245E+04 0.681E+00 0.231E-02

 122 11/ 9/1964 dry field runoff 0.159E+04 0.861E+00 0.337E-02

 123 11/10/1964 dry field runoff 0.442E+04 0.306E+00 0.106E-02

 124 11/11/1964 dry field runoff 0.442E+04 0.293E+00 0.101E-02

 125 11/12/1964 dry field runoff 0.249E+04 0.486E+00 0.168E-02

 126 11/22/1964 dry field runoff 0.553E+03 0.147E+01 0.586E-02

 127 11/26/1964 dry field runoff 0.138E+03 0.332E+01 0.133E-01

 128 12/ 1/1964 dry field runoff 0.484E+03 0.135E+01 0.548E-02

 129 12/ 3/1964 dry field runoff 0.156E+04 0.473E+00 0.193E-02

 130 12/ 5/1964 dry field runoff 0.346E+02 0.428E+01 0.175E-01

 131 12/15/1964 dry field runoff 0.691E+02 0.300E+01 0.127E-01

 132 12/19/1964 dry field runoff 0.218E+04 0.256E+00 0.110E-02

 133 12/20/1964 dry field runoff 0.218E+04 0.242E+00 0.967E-03

 134 12/21/1964 dry field runoff 0.518E+04 0.102E+00 0.408E-03

 135 12/22/1964 dry field runoff 0.674E+04 0.761E-01 0.305E-03

 136 12/23/1964 dry field runoff 0.174E+05 0.288E-01 0.116E-03

 137 12/24/1964 dry field runoff 0.142E+04 0.313E+00 0.126E-02

 138 12/27/1964 dry field runoff 0.353E+04 0.127E+00 0.559E-03

 139 12/28/1964 dry field runoff 0.691E+03 0.525E+00 0.214E-02

 140 12/29/1964 dry field runoff 0.138E+03 0.151E+01 0.623E-02

 141 12/30/1964 dry field runoff 0.256E+04 0.155E+00 0.660E-03

 142 12/31/1964 dry field runoff 0.104E+04 0.338E+00 0.139E-02

 143 1/ 3/1965 dry field runoff 0.325E+04 0.112E+00 0.501E-03
52

 144 1/ 4/1965 dry field runoff 0.204E+04 0.165E+00 0.686E-03

 145 1/ 5/1965 dry field runoff 0.238E+04 0.138E+00 0.575E-03

 146 1/ 6/1965 dry field runoff 0.743E+04 0.444E-01 0.186E-03

 147 1/ 7/1965 dry field runoff 0.124E+04 0.234E+00 0.978E-03

 148 1/12/1965 dry field runoff 0.207E+03 0.857E+00 0.390E-02

 149 1/20/1965 dry field runoff 0.263E+04 0.940E-01 0.439E-03

 150 1/24/1965 dry field runoff 0.273E+04 0.837E-01 0.393E-03

 151 2/ 5/1965 dry field runoff 0.183E+04 0.996E-01 0.484E-03

 152 3/13/1965 dry field runoff 0.166E+04 0.588E-01 0.324E-03

 153 3/27/1965 dry field runoff 0.169E+04 0.433E-01 0.251E-03

 154 3/28/1965 dry field runoff 0.263E+04 0.271E-01 0.148E-03

 155 4/ 1/1965 dry field runoff 0.308E+04 0.216E-01 0.127E-03

 156 4/ 8/1965 dry field runoff 0.114E+04 0.465E-01 0.280E-03

 157 4/ 9/1965 dry field runoff 0.228E+04 0.233E-01 0.133E-03

 158 4/10/1965 dry field runoff 0.605E+04 0.878E-02 0.501E-04

 159 4/11/1965 dry field runoff 0.346E+02 0.294E+00 0.167E-02

 160 4/13/1965 dry field runoff 0.691E+03 0.616E-01 0.375E-03

 161 4/14/1965 dry field runoff 0.124E+04 0.351E-01 0.204E-03

 162 4/16/1965 dry field runoff 0.162E+04 0.267E-01 0.163E-03

 163 4/17/1965 dry field runoff 0.933E+03 0.413E-01 0.241E-03

 164 4/21/1965 dry field runoff 0.173E+03 0.131E+00 0.816E-03

 165 5/31/1965 manual release 0.330E+05 0.162E+03 0.412E+01

 166 8/12/1965 dry field runoff 0.498E+04 0.122E+02 0.248E-01

 167 11/ 9/1965 dry field runoff 0.622E+03 0.305E+01 0.113E-01

 168 11/13/1965 dry field runoff 0.149E+04 0.126E+01 0.475E-02

 169 11/14/1965 dry field runoff 0.646E+04 0.292E+00 0.963E-03

 170 11/15/1965 dry field runoff 0.138E+04 0.121E+01 0.395E-02

 171 11/17/1965 dry field runoff 0.162E+04 0.995E+00 0.377E-02

 172 11/18/1965 dry field runoff 0.207E+04 0.743E+00 0.248E-02

 173 11/19/1965 dry field runoff 0.968E+03 0.142E+01 0.475E-02

 174 11/23/1965 dry field runoff 0.518E+03 0.216E+01 0.835E-02

 175 11/24/1965 dry field runoff 0.114E+04 0.105E+01 0.368E-02

 176 11/25/1965 dry field runoff 0.415E+04 0.302E+00 0.104E-02

 177 12/12/1965 dry field runoff 0.494E+04 0.182E+00 0.725E-03

 178 12/13/1965 dry field runoff 0.691E+02 0.410E+01 0.151E-01

 179 12/25/1965 dry field runoff 0.394E+04 0.183E+00 0.742E-03

 180 12/26/1965 dry field runoff 0.346E+02 0.397E+01 0.151E-01

 181 12/29/1965 dry field runoff 0.712E+04 0.957E-01 0.391E-03

 182 12/31/1965 dry field runoff 0.218E+04 0.287E+00 0.118E-02

 183 1/ 5/1966 dry field runoff 0.190E+04 0.301E+00 0.125E-02

 184 1/ 6/1966 dry field runoff 0.346E+03 0.119E+01 0.469E-02

 185 1/23/1966 dry field runoff 0.380E+03 0.893E+00 0.391E-02

 186 1/30/1966 dry field runoff 0.971E+04 0.423E-01 0.189E-03

 187 1/31/1966 dry field runoff 0.152E+04 0.237E+00 0.997E-03

 188 2/ 2/1966 dry field runoff 0.232E+04 0.157E+00 0.705E-03

 189 2/ 4/1966 dry field runoff 0.121E+04 0.272E+00 0.123E-02

 190 2/ 5/1966 dry field runoff 0.111E+04 0.279E+00 0.120E-02

 191 2/ 6/1966 dry field runoff 0.138E+04 0.222E+00 0.953E-03

 192 2/20/1966 dry field runoff 0.176E+04 0.145E+00 0.685E-03

 193 2/23/1966 dry field runoff 0.138E+03 0.919E+00 0.438E-02

 194 2/25/1966 dry field runoff 0.311E+03 0.547E+00 0.263E-02

 195 2/26/1966 dry field runoff 0.183E+04 0.120E+00 0.556E-03

 196 4/10/1966 dry field runoff 0.864E+03 0.106E+00 0.607E-03

 197 4/12/1966 dry field runoff 0.114E+04 0.778E-01 0.450E-03

 198 5/10/1966 dry field runoff 0.449E+03 0.774E-01 0.521E-03

 199 5/31/1966 manual release 0.321E+05 0.166E+03 0.451E+01

 200 11/ 7/1966 dry field runoff 0.129E+05 0.132E+00 0.531E-03

 201 11/15/1966 dry field runoff 0.484E+03 0.217E+01 0.897E-02

 202 11/16/1966 dry field runoff 0.484E+04 0.258E+00 0.975E-03

 203 11/17/1966 dry field runoff 0.245E+04 0.472E+00 0.174E-02

 204 11/20/1966 dry field runoff 0.110E+05 0.102E+00 0.430E-03

 205 11/21/1966 dry field runoff 0.366E+04 0.281E+00 0.105E-02

 206 11/22/1966 dry field runoff 0.263E+04 0.371E+00 0.140E-02
53

 207 11/29/1966 dry field runoff 0.729E+04 0.119E+00 0.508E-03

 208 12/ 2/1966 dry field runoff 0.180E+04 0.419E+00 0.181E-02

 209 12/ 3/1966 dry field runoff 0.854E+04 0.884E-01 0.349E-03

 210 12/ 5/1966 dry field runoff 0.588E+04 0.123E+00 0.531E-03

 211 12/ 6/1966 dry field runoff 0.702E+04 0.973E-01 0.386E-03

 212 12/ 7/1966 dry field runoff 0.276E+04 0.231E+00 0.917E-03

 213 12/10/1966 dry field runoff 0.204E+04 0.292E+00 0.128E-02

 214 12/24/1966 dry field runoff 0.346E+02 0.272E+01 0.123E-01

 215 1/21/1967 dry field runoff 0.112E+05 0.284E-01 0.138E-03

 216 1/22/1967 dry field runoff 0.262E+05 0.116E-01 0.533E-04

 217 1/24/1967 dry field runoff 0.933E+03 0.277E+00 0.135E-02

 218 1/25/1967 dry field runoff 0.102E+05 0.275E-01 0.129E-03

 219 1/27/1967 dry field runoff 0.173E+04 0.148E+00 0.726E-03

 220 1/29/1967 dry field runoff 0.639E+04 0.405E-01 0.200E-03

 221 1/30/1967 dry field runoff 0.591E+04 0.414E-01 0.194E-03

 222 1/31/1967 dry field runoff 0.677E+04 0.351E-01 0.165E-03

 223 2/ 1/1967 dry field runoff 0.173E+03 0.742E+00 0.348E-02

 224 2/25/1967 dry field runoff 0.135E+04 0.108E+00 0.583E-03

 225 2/26/1967 dry field runoff 0.162E+04 0.862E-01 0.442E-03

 226 3/11/1967 dry field runoff 0.100E+04 0.107E+00 0.605E-03

 227 3/12/1967 dry field runoff 0.449E+04 0.252E-01 0.135E-03

 228 3/13/1967 dry field runoff 0.429E+04 0.254E-01 0.136E-03

 229 3/14/1967 dry field runoff 0.173E+04 0.580E-01 0.311E-03

 230 3/16/1967 dry field runoff 0.270E+04 0.372E-01 0.212E-03

 231 3/17/1967 dry field runoff 0.740E+04 0.132E-01 0.716E-04

 232 3/31/1967 dry field runoff 0.615E+04 0.123E-01 0.739E-04

 233 4/ 6/1967 dry field runoff 0.107E+04 0.561E-01 0.343E-03

 234 4/ 7/1967 dry field runoff 0.698E+04 0.905E-02 0.527E-04

 235 4/11/1967 dry field runoff 0.318E+04 0.181E-01 0.112E-03

 236 4/16/1967 dry field runoff 0.242E+04 0.210E-01 0.132E-03

 237 4/18/1967 dry field runoff 0.121E+04 0.378E-01 0.238E-03

 238 4/19/1967 dry field runoff 0.135E+04 0.325E-01 0.196E-03

 239 4/20/1967 dry field runoff 0.864E+03 0.464E-01 0.280E-03

 240 4/22/1967 dry field runoff 0.515E+04 0.860E-02 0.546E-04

 241 4/24/1967 dry field runoff 0.104E+04 0.366E-01 0.234E-03

 242 5/31/1967 manual release 0.341E+05 0.157E+03 0.403E+01

 243 6/ 2/1967 dry field runoff 0.622E+03 0.108E+04 0.751E+00

 244 6/ 3/1967 dry field runoff 0.111E+04 0.620E+03 0.142E+00

 245 10/ 6/1967 dry field runoff 0.276E+03 0.763E+01 0.280E-01

 246 11/15/1967 dry field runoff 0.131E+04 0.571E+00 0.257E-02

 247 11/28/1967 dry field runoff 0.795E+03 0.618E+00 0.291E-02

 248 11/30/1967 dry field runoff 0.328E+04 0.159E+00 0.750E-03

 249 12/ 1/1967 dry field runoff 0.249E+04 0.195E+00 0.840E-03

 250 12/ 4/1967 dry field runoff 0.795E+03 0.516E+00 0.244E-02

 251 12/ 5/1967 dry field runoff 0.456E+04 0.972E-01 0.429E-03

 252 12/ 8/1967 dry field runoff 0.200E+04 0.201E+00 0.960E-03

 253 12/18/1967 dry field runoff 0.726E+03 0.410E+00 0.199E-02

 254 12/19/1967 dry field runoff 0.346E+02 0.190E+01 0.874E-02

 255 1/ 2/1968 dry field runoff 0.691E+02 0.133E+01 0.666E-02

 256 1/ 9/1968 dry field runoff 0.311E+03 0.566E+00 0.287E-02

 257 1/11/1968 dry field runoff 0.743E+04 0.328E-01 0.166E-03

 258 1/14/1968 dry field runoff 0.138E+03 0.833E+00 0.425E-02

 259 1/15/1968 dry field runoff 0.719E+04 0.310E-01 0.155E-03

 260 1/16/1968 dry field runoff 0.484E+03 0.347E+00 0.170E-02

 261 1/30/1968 dry field runoff 0.328E+04 0.530E-01 0.283E-03

 262 1/31/1968 dry field runoff 0.105E+05 0.162E-01 0.826E-04

 263 2/ 2/1968 dry field runoff 0.484E+03 0.269E+00 0.144E-02

 264 2/ 3/1968 dry field runoff 0.622E+03 0.210E+00 0.109E-02

 265 2/17/1968 dry field runoff 0.359E+04 0.348E-01 0.196E-03

 266 2/18/1968 dry field runoff 0.259E+04 0.449E-01 0.241E-03

 267 2/20/1968 dry field runoff 0.418E+04 0.276E-01 0.157E-03

 268 2/22/1968 dry field runoff 0.311E+04 0.349E-01 0.200E-03

 269 2/23/1968 dry field runoff 0.691E+02 0.503E+00 0.272E-02
54

 270 3/ 8/1968 dry field runoff 0.491E+04 0.162E-01 0.994E-04

 271 3/ 9/1968 dry field runoff 0.760E+03 0.848E-01 0.488E-03

 272 3/13/1968 dry field runoff 0.636E+04 0.109E-01 0.680E-04

 273 3/14/1968 dry field runoff 0.270E+04 0.234E-01 0.137E-03

 274 3/17/1968 dry field runoff 0.245E+04 0.241E-01 0.153E-03

 275 4/ 2/1968 dry field runoff 0.318E+04 0.131E-01 0.879E-04

 276 5/14/1968 dry field runoff 0.449E+03 0.260E-01 0.210E-03

 277 5/31/1968 manual release 0.320E+05 0.167E+03 0.413E+01

 278 10/12/1968 dry field runoff 0.311E+03 0.821E+01 0.291E-01

 279 10/13/1968 dry field runoff 0.124E+04 0.252E+01 0.784E-02

 280 10/15/1968 dry field runoff 0.553E+03 0.470E+01 0.167E-01

 281 10/30/1968 dry field runoff 0.553E+03 0.296E+01 0.111E-01

 282 10/31/1968 dry field runoff 0.449E+03 0.328E+01 0.110E-01

 283 11/ 3/1968 dry field runoff 0.581E+04 0.303E+00 0.115E-02

 284 11/ 4/1968 dry field runoff 0.664E+04 0.249E+00 0.828E-03

 285 11/12/1968 dry field runoff 0.242E+03 0.361E+01 0.141E-01

 286 11/15/1968 dry field runoff 0.339E+04 0.363E+00 0.144E-02

 287 11/16/1968 dry field runoff 0.691E+02 0.564E+01 0.198E-01

 288 11/19/1968 dry field runoff 0.204E+04 0.523E+00 0.209E-02

 289 11/30/1968 dry field runoff 0.726E+03 0.102E+01 0.420E-02

 290 12/ 8/1968 dry field runoff 0.484E+03 0.120E+01 0.503E-02

 291 12/ 9/1968 dry field runoff 0.346E+03 0.147E+01 0.578E-02

 292 12/11/1968 dry field runoff 0.391E+04 0.172E+00 0.724E-03

 293 12/14/1968 dry field runoff 0.432E+04 0.146E+00 0.618E-03

 294 12/15/1968 dry field runoff 0.159E+04 0.356E+00 0.140E-02

 295 12/16/1968 dry field runoff 0.349E+04 0.164E+00 0.651E-03

 296 12/24/1968 dry field runoff 0.553E+03 0.761E+00 0.328E-02

 297 12/25/1968 dry field runoff 0.311E+04 0.155E+00 0.637E-03

 298 12/26/1968 dry field runoff 0.197E+04 0.231E+00 0.938E-03

 299 12/29/1968 dry field runoff 0.311E+03 0.104E+01 0.449E-02

 300 1/12/1969 dry field runoff 0.314E+04 0.117E+00 0.524E-03

 301 1/13/1969 dry field runoff 0.473E+04 0.745E-01 0.318E-03

 302 1/14/1969 dry field runoff 0.992E+04 0.351E-01 0.150E-03

 303 1/19/1969 dry field runoff 0.712E+04 0.457E-01 0.209E-03

 304 1/20/1969 dry field runoff 0.139E+05 0.225E-01 0.972E-04

 305 1/21/1969 dry field runoff 0.702E+04 0.426E-01 0.184E-03

 306 1/22/1969 dry field runoff 0.349E+04 0.813E-01 0.353E-03

 307 1/24/1969 dry field runoff 0.207E+03 0.823E+00 0.380E-02

 308 1/25/1969 dry field runoff 0.491E+04 0.550E-01 0.247E-03

 309 1/26/1969 dry field runoff 0.743E+04 0.352E-01 0.155E-03

 310 1/27/1969 dry field runoff 0.591E+04 0.427E-01 0.187E-03

 311 1/30/1969 dry field runoff 0.138E+03 0.884E+00 0.414E-02

 312 2/ 5/1969 dry field runoff 0.138E+03 0.804E+00 0.382E-02

 313 2/ 6/1969 dry field runoff 0.916E+04 0.235E-01 0.109E-03

 314 2/ 7/1969 dry field runoff 0.425E+04 0.477E-01 0.215E-03

 315 2/10/1969 dry field runoff 0.183E+04 0.102E+00 0.493E-03

 316 2/12/1969 dry field runoff 0.119E+05 0.161E-01 0.778E-04

 317 2/15/1969 dry field runoff 0.259E+04 0.660E-01 0.323E-03

 318 2/16/1969 dry field runoff 0.169E+04 0.931E-01 0.430E-03

 319 2/18/1969 dry field runoff 0.211E+04 0.741E-01 0.364E-03

 320 2/19/1969 dry field runoff 0.353E+04 0.430E-01 0.201E-03

 321 2/20/1969 dry field runoff 0.104E+03 0.617E+00 0.287E-02

 322 2/24/1969 dry field runoff 0.321E+04 0.435E-01 0.217E-03

 323 2/25/1969 dry field runoff 0.397E+04 0.335E-01 0.158E-03

 324 2/26/1969 dry field runoff 0.135E+04 0.896E-01 0.424E-03

 325 2/28/1969 dry field runoff 0.691E+02 0.614E+00 0.308E-02

 326 3/ 1/1969 dry field runoff 0.581E+04 0.213E-01 0.106E-03

 327 3/ 3/1969 dry field runoff 0.829E+03 0.125E+00 0.634E-03

 328 3/13/1969 dry field runoff 0.321E+04 0.303E-01 0.159E-03

 329 3/21/1969 dry field runoff 0.166E+04 0.487E-01 0.261E-03

 330 4/ 6/1969 dry field runoff 0.854E+04 0.739E-02 0.423E-04

 331 4/24/1969 dry field runoff 0.359E+04 0.113E-01 0.704E-04

 332 5/31/1969 manual release 0.314E+05 0.170E+03 0.452E+01
55

 333 10/16/1969 dry field runoff 0.563E+04 0.455E+00 0.172E-02

 334 11/ 6/1969 dry field runoff 0.501E+04 0.274E+00 0.112E-02

 335 12/ 9/1969 dry field runoff 0.131E+04 0.459E+00 0.209E-02

 336 12/11/1969 dry field runoff 0.131E+04 0.437E+00 0.199E-02

 337 12/19/1969 dry field runoff 0.176E+04 0.287E+00 0.134E-02

 338 12/20/1969 dry field runoff 0.809E+04 0.630E-01 0.276E-03

 339 12/21/1969 dry field runoff 0.978E+04 0.504E-01 0.221E-03

 340 12/22/1969 dry field runoff 0.491E+04 0.958E-01 0.420E-03

 341 12/24/1969 dry field runoff 0.104E+04 0.399E+00 0.188E-02

 342 12/25/1969 dry field runoff 0.567E+04 0.768E-01 0.342E-03

 343 12/26/1969 dry field runoff 0.415E+03 0.770E+00 0.341E-02

 344 1/ 9/1970 dry field runoff 0.757E+04 0.447E-01 0.221E-03

 345 1/10/1970 dry field runoff 0.273E+04 0.113E+00 0.527E-03

 346 1/12/1970 dry field runoff 0.159E+04 0.183E+00 0.910E-03

 347 1/14/1970 dry field runoff 0.684E+04 0.434E-01 0.216E-03

 348 1/15/1970 dry field runoff 0.128E+05 0.222E-01 0.105E-03

 349 1/16/1970 dry field runoff 0.363E+04 0.734E-01 0.346E-03

 350 1/17/1970 dry field runoff 0.581E+04 0.451E-01 0.213E-03

 351 1/18/1970 dry field runoff 0.183E+04 0.131E+00 0.622E-03

 352 1/20/1970 dry field runoff 0.214E+04 0.111E+00 0.559E-03

 353 1/21/1970 dry field runoff 0.626E+04 0.374E-01 0.179E-03

 354 1/22/1970 dry field runoff 0.619E+04 0.365E-01 0.175E-03

 355 1/24/1970 dry field runoff 0.197E+04 0.107E+00 0.543E-03

 356 1/28/1970 dry field runoff 0.270E+04 0.729E-01 0.377E-03

 357 2/ 1/1970 dry field runoff 0.276E+03 0.452E+00 0.236E-02

 358 2/12/1970 dry field runoff 0.346E+02 0.853E+00 0.466E-02

 359 2/13/1970 dry field runoff 0.128E+04 0.104E+00 0.565E-03

 360 2/14/1970 dry field runoff 0.453E+04 0.301E-01 0.156E-03

 361 2/17/1970 dry field runoff 0.107E+04 0.110E+00 0.609E-03

 362 2/18/1970 dry field runoff 0.225E+04 0.527E-01 0.277E-03

 363 3/ 1/1970 dry field runoff 0.214E+04 0.451E-01 0.260E-03

 364 3/ 2/1970 dry field runoff 0.391E+04 0.240E-01 0.131E-03

 365 3/ 5/1970 dry field runoff 0.480E+04 0.187E-01 0.109E-03

 366 3/ 8/1970 dry field runoff 0.218E+04 0.370E-01 0.217E-03

 367 3/ 9/1970 dry field runoff 0.242E+03 0.210E+00 0.117E-02

 368 3/10/1970 dry field runoff 0.100E+04 0.692E-01 0.393E-03

 369 4/14/1970 dry field runoff 0.657E+03 0.465E-01 0.320E-03

 370 5/31/1970 manual release 0.300E+05 0.178E+03 0.500E+01

 371 6/ 9/1970 dry field runoff 0.346E+02 0.355E+04 0.339E+01

 372 10/21/1970 dry field runoff 0.145E+04 0.145E+01 0.564E-02

 373 10/22/1970 dry field runoff 0.173E+04 0.115E+01 0.381E-02

 374 10/24/1970 dry field runoff 0.204E+04 0.926E+00 0.362E-02

 375 11/ 5/1970 dry field runoff 0.982E+04 0.143E+00 0.574E-03

 376 11/ 6/1970 dry field runoff 0.297E+04 0.426E+00 0.152E-02

 377 11/ 7/1970 dry field runoff 0.249E+04 0.484E+00 0.174E-02

 378 11/25/1970 dry field runoff 0.197E+04 0.398E+00 0.172E-02

 379 11/26/1970 dry field runoff 0.297E+04 0.254E+00 0.100E-02

 380 11/27/1970 dry field runoff 0.145E+04 0.477E+00 0.188E-02

 381 11/29/1970 dry field runoff 0.206E+05 0.353E-01 0.154E-03

 382 11/30/1970 dry field runoff 0.136E+05 0.501E-01 0.199E-03

 383 12/ 1/1970 dry field runoff 0.387E+04 0.165E+00 0.657E-03

 384 12/ 2/1970 dry field runoff 0.318E+04 0.192E+00 0.768E-03

 385 12/ 3/1970 dry field runoff 0.180E+04 0.316E+00 0.127E-02

 386 12/ 4/1970 dry field runoff 0.187E+04 0.294E+00 0.119E-02

 387 12/ 5/1970 dry field runoff 0.370E+04 0.148E+00 0.602E-03

 388 12/ 7/1970 dry field runoff 0.242E+03 0.143E+01 0.631E-02

 389 12/ 8/1970 dry field runoff 0.346E+02 0.294E+01 0.124E-01

 390 12/ 9/1970 dry field runoff 0.346E+03 0.106E+01 0.464E-02

 391 12/14/1970 dry field runoff 0.968E+03 0.419E+00 0.189E-02

 392 12/16/1970 dry field runoff 0.104E+04 0.374E+00 0.169E-02

 393 12/17/1970 dry field runoff 0.297E+04 0.134E+00 0.568E-03

 394 12/19/1970 dry field runoff 0.518E+03 0.612E+00 0.278E-02

 395 12/21/1970 dry field runoff 0.342E+04 0.108E+00 0.493E-03
56

 396 12/22/1970 dry field runoff 0.760E+03 0.403E+00 0.171E-02

 397 12/27/1970 dry field runoff 0.245E+04 0.130E+00 0.600E-03

 398 12/28/1970 dry field runoff 0.726E+03 0.368E+00 0.159E-02

 399 12/29/1970 dry field runoff 0.346E+02 0.174E+01 0.760E-02

 400 12/30/1970 dry field runoff 0.173E+03 0.979E+00 0.447E-02

 401 1/ 2/1971 dry field runoff 0.214E+04 0.129E+00 0.601E-03

 402 1/12/1971 dry field runoff 0.829E+03 0.258E+00 0.123E-02

 403 1/13/1971 dry field runoff 0.304E+04 0.749E-01 0.341E-03

 404 1/19/1971 dry field runoff 0.104E+03 0.890E+00 0.431E-02

 405 1/20/1971 dry field runoff 0.691E+02 0.100E+01 0.475E-02

 406 2/17/1971 dry field runoff 0.294E+04 0.452E-01 0.240E-03

 407 2/19/1971 dry field runoff 0.829E+03 0.136E+00 0.726E-03

 408 3/13/1971 dry field runoff 0.570E+04 0.156E-01 0.892E-04

 409 3/24/1971 dry field runoff 0.370E+04 0.193E-01 0.114E-03

 410 3/26/1971 dry field runoff 0.270E+04 0.248E-01 0.147E-03

 411 3/27/1971 dry field runoff 0.176E+04 0.348E-01 0.197E-03

 412 4/ 7/1971 dry field runoff 0.276E+03 0.127E+00 0.798E-03

 413 5/ 3/1971 dry field runoff 0.328E+04 0.859E-02 0.599E-04

 414 5/ 9/1971 dry field runoff 0.104E+04 0.215E-01 0.153E-03

 415 5/31/1971 manual release 0.332E+05 0.162E+03 0.373E+01

 416 11/12/1971 dry field runoff 0.145E+04 0.898E+00 0.361E-02

 417 11/13/1971 dry field runoff 0.968E+03 0.122E+01 0.444E-02

 418 11/14/1971 dry field runoff 0.194E+04 0.627E+00 0.231E-02

 419 11/29/1971 dry field runoff 0.691E+03 0.116E+01 0.491E-02

 420 12/ 3/1971 dry field runoff 0.114E+04 0.690E+00 0.295E-02

 421 12/ 4/1971 dry field runoff 0.166E+04 0.465E+00 0.185E-02

 422 12/11/1971 dry field runoff 0.104E+03 0.300E+01 0.130E-01

 423 12/13/1971 dry field runoff 0.124E+04 0.513E+00 0.224E-02

 424 12/22/1971 dry field runoff 0.449E+04 0.131E+00 0.584E-03

 425 12/23/1971 dry field runoff 0.346E+04 0.160E+00 0.670E-03

 426 12/25/1971 dry field runoff 0.529E+04 0.104E+00 0.463E-03

 427 12/26/1971 dry field runoff 0.473E+04 0.109E+00 0.460E-03

 428 12/27/1971 dry field runoff 0.553E+03 0.741E+00 0.312E-02

 429 12/28/1971 dry field runoff 0.660E+04 0.747E-01 0.320E-03

 430 12/29/1971 dry field runoff 0.484E+03 0.775E+00 0.328E-02

 431 12/30/1971 dry field runoff 0.553E+03 0.683E+00 0.293E-02

 432 1/21/1972 dry field runoff 0.691E+02 0.169E+01 0.796E-02

 433 1/23/1972 dry field runoff 0.104E+03 0.141E+01 0.667E-02

 434 1/26/1972 dry field runoff 0.346E+02 0.186E+01 0.889E-02

 435 1/27/1972 dry field runoff 0.124E+04 0.235E+00 0.111E-02

 436 1/28/1972 dry field runoff 0.259E+04 0.114E+00 0.522E-03

 437 2/ 5/1972 dry field runoff 0.933E+03 0.262E+00 0.128E-02

 438 2/ 6/1972 dry field runoff 0.788E+04 0.335E-01 0.158E-03

 439 2/26/1972 dry field runoff 0.138E+03 0.708E+00 0.372E-02

 440 3/23/1972 dry field runoff 0.449E+03 0.191E+00 0.114E-02

 441 4/ 6/1972 dry field runoff 0.259E+04 0.289E-01 0.184E-03

 442 4/12/1972 dry field runoff 0.795E+03 0.716E-01 0.465E-03

 443 4/13/1972 dry field runoff 0.518E+03 0.957E-01 0.587E-03

 444 4/25/1972 dry field runoff 0.225E+04 0.204E-01 0.139E-03

 445 5/21/1972 dry field runoff 0.518E+03 0.365E-01 0.284E-03

 446 5/31/1972 manual release 0.318E+05 0.168E+03 0.448E+01

 447 6/10/1972 dry field runoff 0.242E+03 0.162E+04 0.148E+01

 448 9/26/1972 dry field runoff 0.159E+04 0.373E+01 0.119E-01

 449 9/27/1972 dry field runoff 0.214E+04 0.262E+01 0.666E-02

 450 9/28/1972 dry field runoff 0.159E+04 0.328E+01 0.831E-02

 451 10/10/1972 dry field runoff 0.200E+04 0.176E+01 0.597E-02

 452 10/11/1972 dry field runoff 0.135E+04 0.235E+01 0.662E-02

 453 10/12/1972 dry field runoff 0.636E+04 0.514E+00 0.146E-02

 454 10/13/1972 dry field runoff 0.311E+03 0.698E+01 0.196E-01

 455 10/15/1972 dry field runoff 0.156E+04 0.177E+01 0.609E-02

 456 10/17/1972 dry field runoff 0.415E+03 0.496E+01 0.172E-01

 457 11/ 4/1972 dry field runoff 0.491E+04 0.317E+00 0.119E-02

 458 11/ 5/1972 dry field runoff 0.518E+03 0.226E+01 0.738E-02
57

 459 11/ 8/1972 dry field runoff 0.211E+04 0.623E+00 0.235E-02

 460 11/10/1972 dry field runoff 0.142E+04 0.842E+00 0.317E-02

 461 11/11/1972 dry field runoff 0.905E+04 0.134E+00 0.453E-03

 462 11/12/1972 dry field runoff 0.114E+04 0.922E+00 0.308E-02

 463 11/14/1972 dry field runoff 0.567E+04 0.196E+00 0.742E-03

 464 11/15/1972 dry field runoff 0.304E+04 0.336E+00 0.114E-02

 465 11/16/1972 dry field runoff 0.912E+04 0.111E+00 0.378E-03

 466 11/17/1972 dry field runoff 0.235E+04 0.397E+00 0.135E-02

 467 11/20/1972 dry field runoff 0.104E+03 0.379E+01 0.145E-01

 468 11/24/1972 dry field runoff 0.346E+02 0.480E+01 0.185E-01

 469 12/ 7/1972 dry field runoff 0.346E+04 0.189E+00 0.749E-03

 470 12/17/1972 dry field runoff 0.670E+04 0.848E-01 0.340E-03

 471 12/18/1972 dry field runoff 0.218E+04 0.237E+00 0.899E-03

 472 12/19/1972 dry field runoff 0.100E+04 0.467E+00 0.178E-02

 473 12/20/1972 dry field runoff 0.242E+03 0.135E+01 0.517E-02

 474 12/24/1972 dry field runoff 0.415E+03 0.899E+00 0.365E-02

 475 12/28/1972 dry field runoff 0.449E+03 0.794E+00 0.326E-02

 476 1/ 9/1973 dry field runoff 0.733E+04 0.534E-01 0.226E-03

 477 1/10/1973 dry field runoff 0.964E+04 0.386E-01 0.155E-03

 478 1/12/1973 dry field runoff 0.999E+04 0.366E-01 0.156E-03

 479 1/13/1973 dry field runoff 0.356E+04 0.947E-01 0.381E-03

 480 1/14/1973 dry field runoff 0.346E+02 0.191E+01 0.768E-02

 481 1/16/1973 dry field runoff 0.104E+04 0.285E+00 0.124E-02

 482 1/17/1973 dry field runoff 0.107E+05 0.294E-01 0.121E-03

 483 1/18/1973 dry field runoff 0.114E+04 0.240E+00 0.979E-03

 484 1/19/1973 dry field runoff 0.750E+04 0.392E-01 0.161E-03

 485 1/21/1973 dry field runoff 0.311E+03 0.642E+00 0.281E-02

 486 1/22/1973 dry field runoff 0.104E+03 0.113E+01 0.473E-02

 487 1/25/1973 dry field runoff 0.691E+03 0.323E+00 0.143E-02

 488 1/26/1973 dry field runoff 0.899E+03 0.246E+00 0.103E-02

 489 1/30/1973 dry field runoff 0.173E+04 0.130E+00 0.581E-03

 490 2/ 4/1973 dry field runoff 0.297E+04 0.714E-01 0.324E-03

 491 2/ 6/1973 dry field runoff 0.415E+03 0.380E+00 0.173E-02

 492 2/ 7/1973 dry field runoff 0.422E+04 0.464E-01 0.202E-03

 493 2/10/1973 dry field runoff 0.619E+04 0.304E-01 0.141E-03

 494 2/11/1973 dry field runoff 0.705E+04 0.252E-01 0.109E-03

 495 2/12/1973 dry field runoff 0.899E+03 0.168E+00 0.731E-03

 496 2/15/1973 dry field runoff 0.183E+04 0.852E-01 0.400E-03

 497 2/27/1973 dry field runoff 0.439E+04 0.295E-01 0.145E-03

 498 2/28/1973 dry field runoff 0.157E+05 0.798E-02 0.366E-04

 499 3/ 1/1973 dry field runoff 0.691E+02 0.570E+00 0.261E-02

 500 3/ 4/1973 dry field runoff 0.377E+04 0.298E-01 0.149E-03

 501 3/ 7/1973 dry field runoff 0.118E+04 0.817E-01 0.413E-03

 502 3/ 8/1973 dry field runoff 0.100E+04 0.888E-01 0.420E-03

 503 3/ 9/1973 dry field runoff 0.242E+03 0.255E+00 0.121E-02

 504 3/20/1973 dry field runoff 0.484E+04 0.160E-01 0.847E-04

 505 3/22/1973 dry field runoff 0.411E+04 0.178E-01 0.940E-04

 506 3/31/1973 dry field runoff 0.183E+04 0.317E-01 0.173E-03

 507 5/31/1973 manual release 0.335E+05 0.158E+03 0.474E+01

 508 9/23/1973 dry field runoff 0.176E+04 0.308E+01 0.102E-01

 509 10/ 8/1973 dry field runoff 0.308E+04 0.103E+01 0.376E-02

 510 10/23/1973 dry field runoff 0.836E+04 0.237E+00 0.926E-03

 511 11/ 6/1973 dry field runoff 0.511E+04 0.250E+00 0.103E-02

 512 11/ 7/1973 dry field runoff 0.207E+03 0.350E+01 0.127E-01

 513 11/10/1973 dry field runoff 0.131E+04 0.789E+00 0.330E-02

 514 11/11/1973 dry field runoff 0.453E+04 0.231E+00 0.864E-03

 515 11/12/1973 dry field runoff 0.601E+04 0.167E+00 0.623E-03

 516 11/13/1973 dry field runoff 0.221E+04 0.419E+00 0.156E-02

 517 11/14/1973 dry field runoff 0.394E+04 0.232E+00 0.872E-03

 518 11/17/1973 dry field runoff 0.453E+04 0.189E+00 0.804E-03

 519 11/18/1973 dry field runoff 0.746E+04 0.109E+00 0.414E-03

 520 11/21/1973 dry field runoff 0.657E+03 0.970E+00 0.414E-02

 521 11/30/1973 dry field runoff 0.259E+04 0.232E+00 0.101E-02
58

 522 12/ 1/1973 dry field runoff 0.829E+04 0.709E-01 0.285E-03

 523 12/ 2/1973 dry field runoff 0.270E+04 0.203E+00 0.815E-03

 524 12/12/1973 dry field runoff 0.121E+04 0.358E+00 0.160E-02

 525 12/14/1973 dry field runoff 0.135E+04 0.309E+00 0.139E-02

 526 12/22/1973 dry field runoff 0.653E+04 0.599E-01 0.274E-03

 527 12/24/1973 dry field runoff 0.346E+02 0.213E+01 0.978E-02

 528 12/27/1973 dry field runoff 0.553E+04 0.637E-01 0.296E-03

 529 12/28/1973 dry field runoff 0.314E+04 0.104E+00 0.453E-03

 530 1/ 1/1974 dry field runoff 0.311E+03 0.709E+00 0.333E-02

 531 1/ 4/1974 dry field runoff 0.968E+03 0.273E+00 0.129E-02

 532 1/ 5/1974 dry field runoff 0.491E+04 0.571E-01 0.257E-03

 533 1/ 6/1974 dry field runoff 0.899E+03 0.267E+00 0.119E-02

 534 1/ 7/1974 dry field runoff 0.332E+04 0.782E-01 0.353E-03

 535 1/12/1974 dry field runoff 0.380E+04 0.639E-01 0.308E-03

 536 1/15/1974 dry field runoff 0.397E+04 0.575E-01 0.279E-03

 537 1/17/1974 dry field runoff 0.456E+04 0.480E-01 0.233E-03

 538 1/19/1974 dry field runoff 0.273E+04 0.748E-01 0.366E-03

 539 2/ 1/1974 dry field runoff 0.145E+04 0.108E+00 0.548E-03

 540 2/13/1974 dry field runoff 0.107E+04 0.114E+00 0.605E-03

 541 2/17/1974 dry field runoff 0.346E+02 0.716E+00 0.382E-02

 542 2/20/1974 dry field runoff 0.899E+03 0.116E+00 0.627E-03

 543 3/ 1/1974 dry field runoff 0.543E+04 0.185E-01 0.103E-03

 544 3/ 2/1974 dry field runoff 0.494E+04 0.191E-01 0.101E-03

 545 3/ 3/1974 dry field runoff 0.114E+04 0.733E-01 0.386E-03

 546 3/ 8/1974 dry field runoff 0.384E+04 0.219E-01 0.124E-03

 547 3/12/1974 dry field runoff 0.194E+04 0.385E-01 0.220E-03

 548 3/26/1974 dry field runoff 0.266E+04 0.216E-01 0.130E-03

 549 3/27/1974 dry field runoff 0.899E+03 0.547E-01 0.312E-03

 550 3/28/1974 dry field runoff 0.138E+04 0.362E-01 0.208E-03

 551 3/29/1974 dry field runoff 0.726E+03 0.612E-01 0.352E-03

 552 3/30/1974 dry field runoff 0.829E+03 0.529E-01 0.306E-03

 553 3/31/1974 dry field runoff 0.207E+04 0.224E-01 0.130E-03

 554 4/ 1/1974 dry field runoff 0.484E+03 0.761E-01 0.440E-03

 555 4/ 2/1974 dry field runoff 0.280E+04 0.157E-01 0.924E-04

 556 4/10/1974 dry field runoff 0.726E+03 0.450E-01 0.287E-03

 557 4/24/1974 dry field runoff 0.449E+03 0.476E-01 0.320E-03

 558 5/31/1974 manual release 0.323E+05 0.167E+03 0.408E+01

 559 6/20/1974 dry field runoff 0.249E+04 0.175E+03 0.175E+00

 560 7/ 9/1974 dry field runoff 0.626E+04 0.350E+02 0.445E-01

 561 10/28/1974 dry field runoff 0.515E+04 0.506E+00 0.184E-02

 562 11/ 1/1974 dry field runoff 0.308E+04 0.719E+00 0.265E-02

 563 11/ 8/1974 dry field runoff 0.194E+04 0.889E+00 0.334E-02

 564 11/22/1974 dry field runoff 0.180E+04 0.658E+00 0.257E-02

 565 12/ 3/1974 dry field runoff 0.432E+04 0.224E+00 0.899E-03

 566 12/ 4/1974 dry field runoff 0.698E+04 0.132E+00 0.485E-03

 567 12/28/1974 dry field runoff 0.515E+04 0.117E+00 0.504E-03

 568 12/29/1974 dry field runoff 0.532E+04 0.107E+00 0.432E-03

 569 1/ 6/1975 dry field runoff 0.104E+03 0.211E+01 0.925E-02

 570 1/ 7/1975 dry field runoff 0.760E+03 0.558E+00 0.240E-02

 571 1/11/1975 dry field runoff 0.138E+03 0.168E+01 0.747E-02

 572 1/29/1975 dry field runoff 0.207E+03 0.104E+01 0.483E-02

 573 2/ 1/1975 dry field runoff 0.242E+04 0.135E+00 0.632E-03

 574 2/ 2/1975 dry field runoff 0.266E+04 0.117E+00 0.520E-03

 575 2/ 3/1975 dry field runoff 0.394E+04 0.778E-01 0.347E-03

 576 2/ 4/1975 dry field runoff 0.187E+04 0.153E+00 0.685E-03

 577 2/ 7/1975 dry field runoff 0.276E+03 0.707E+00 0.336E-02

 578 2/ 8/1975 dry field runoff 0.211E+04 0.127E+00 0.582E-03

 579 2/ 9/1975 dry field runoff 0.691E+04 0.389E-01 0.176E-03

 580 2/10/1975 dry field runoff 0.933E+03 0.247E+00 0.112E-02

 581 2/13/1975 dry field runoff 0.757E+04 0.333E-01 0.161E-03

 582 2/14/1975 dry field runoff 0.425E+04 0.552E-01 0.252E-03

 583 2/20/1975 dry field runoff 0.197E+04 0.105E+00 0.520E-03

 584 3/ 6/1975 dry field runoff 0.204E+04 0.795E-01 0.413E-03
59

 585 3/ 8/1975 dry field runoff 0.353E+04 0.449E-01 0.234E-03

 586 3/ 9/1975 dry field runoff 0.135E+04 0.104E+00 0.511E-03

 587 3/11/1975 dry field runoff 0.933E+03 0.140E+00 0.736E-03

 588 3/14/1975 dry field runoff 0.798E+04 0.174E-01 0.919E-04

 589 3/16/1975 dry field runoff 0.152E+04 0.804E-01 0.427E-03

 590 3/22/1975 dry field runoff 0.888E+04 0.131E-01 0.711E-04

 591 3/24/1975 dry field runoff 0.166E+04 0.624E-01 0.339E-03

 592 4/ 5/1975 dry field runoff 0.162E+04 0.504E-01 0.285E-03

 593 4/ 7/1975 dry field runoff 0.128E+04 0.596E-01 0.337E-03

 594 4/25/1975 dry field runoff 0.346E+02 0.340E+00 0.204E-02

 595 5/31/1975 manual release 0.314E+05 0.170E+03 0.475E+01

 596 8/19/1975 dry field runoff 0.829E+03 0.260E+02 0.693E-01

 597 10/10/1975 dry field runoff 0.346E+04 0.608E+00 0.248E-02

 598 10/11/1975 dry field runoff 0.864E+03 0.200E+01 0.659E-02

 599 10/27/1975 dry field runoff 0.149E+04 0.679E+00 0.297E-02

 600 10/30/1975 dry field runoff 0.232E+04 0.402E+00 0.177E-02

 601 10/31/1975 dry field runoff 0.301E+04 0.293E+00 0.113E-02

 602 11/16/1975 dry field runoff 0.899E+03 0.568E+00 0.266E-02

 603 12/22/1975 dry field runoff 0.276E+03 0.655E+00 0.341E-02

 604 12/23/1975 dry field runoff 0.104E+03 0.106E+01 0.531E-02

 605 1/10/1976 dry field runoff 0.290E+04 0.659E-01 0.358E-03

 606 2/ 6/1976 dry field runoff 0.207E+03 0.375E+00 0.221E-02

 607 2/14/1976 dry field runoff 0.256E+04 0.422E-01 0.255E-03

 608 2/17/1976 dry field runoff 0.214E+04 0.465E-01 0.284E-03

 609 3/ 1/1976 dry field runoff 0.501E+04 0.160E-01 0.102E-03

 610 3/ 3/1976 dry field runoff 0.321E+04 0.233E-01 0.149E-03

 611 4/ 8/1976 dry field runoff 0.314E+04 0.114E-01 0.839E-04

 612 4/ 9/1976 dry field runoff 0.211E+04 0.157E-01 0.109E-03

 613 4/11/1976 dry field runoff 0.601E+04 0.553E-02 0.409E-04

 614 5/31/1976 manual release 0.315E+05 0.168E+03 0.528E+01

 615 8/15/1976 dry field runoff 0.795E+03 0.351E+02 0.836E-01

 616 8/16/1976 dry field runoff 0.138E+04 0.199E+02 0.337E-01

 617 9/12/1976 dry field runoff 0.173E+04 0.523E+01 0.160E-01

 618 11/14/1976 dry field runoff 0.149E+04 0.589E+00 0.260E-02

 619 11/15/1976 dry field runoff 0.197E+04 0.425E+00 0.167E-02

 620 12/30/1976 dry field runoff 0.829E+03 0.364E+00 0.183E-02

 621 12/31/1976 dry field runoff 0.373E+04 0.869E-01 0.416E-03

 622 1/ 2/1977 dry field runoff 0.933E+03 0.305E+00 0.154E-02

 623 1/ 3/1977 dry field runoff 0.729E+04 0.419E-01 0.202E-03

 624 1/13/1977 dry field runoff 0.449E+03 0.455E+00 0.236E-02

 625 2/ 9/1977 dry field runoff 0.864E+03 0.181E+00 0.101E-02

 626 2/21/1977 dry field runoff 0.304E+04 0.462E-01 0.270E-03

 627 2/22/1977 dry field runoff 0.221E+04 0.590E-01 0.326E-03

 628 2/24/1977 dry field runoff 0.131E+04 0.926E-01 0.543E-03

 629 3/16/1977 dry field runoff 0.829E+03 0.931E-01 0.587E-03

 630 3/17/1977 dry field runoff 0.581E+04 0.144E-01 0.868E-04

 631 3/25/1977 dry field runoff 0.657E+03 0.929E-01 0.601E-03

 632 5/ 1/1977 dry field runoff 0.795E+03 0.348E-01 0.265E-03

 633 5/ 2/1977 dry field runoff 0.328E+04 0.894E-02 0.645E-04

 634 5/31/1977 manual release 0.313E+05 0.173E+03 0.356E+01

 635 9/17/1977 dry field runoff 0.124E+04 0.891E+01 0.253E-01

 636 9/20/1977 dry field runoff 0.356E+04 0.291E+01 0.833E-02

 637 11/ 6/1977 dry field runoff 0.214E+04 0.993E+00 0.362E-02

 638 11/22/1977 dry field runoff 0.129E+05 0.115E+00 0.443E-03

 639 12/12/1977 dry field runoff 0.152E+04 0.588E+00 0.240E-02

 640 12/15/1977 dry field runoff 0.785E+04 0.114E+00 0.469E-03

 641 12/17/1977 dry field runoff 0.138E+03 0.306E+01 0.126E-01

 642 12/18/1977 dry field runoff 0.964E+04 0.849E-01 0.338E-03

 643 12/22/1977 dry field runoff 0.211E+04 0.342E+00 0.143E-02

 644 12/23/1977 dry field runoff 0.881E+04 0.811E-01 0.315E-03

 645 12/27/1977 dry field runoff 0.152E+04 0.408E+00 0.173E-02

 646 12/28/1977 dry field runoff 0.346E+02 0.360E+01 0.142E-01

 647 12/29/1977 dry field runoff 0.346E+03 0.131E+01 0.548E-02
60

 648 1/ 2/1978 dry field runoff 0.242E+03 0.153E+01 0.661E-02

 649 1/ 3/1978 dry field runoff 0.128E+04 0.397E+00 0.164E-02

 650 1/ 4/1978 dry field runoff 0.211E+04 0.241E+00 0.974E-03

 651 1/ 5/1978 dry field runoff 0.550E+04 0.930E-01 0.375E-03

 652 1/ 6/1978 dry field runoff 0.128E+05 0.391E-01 0.158E-03

 653 1/ 9/1978 dry field runoff 0.194E+04 0.232E+00 0.102E-02

 654 1/10/1978 dry field runoff 0.556E+04 0.798E-01 0.327E-03

 655 1/11/1978 dry field runoff 0.415E+03 0.786E+00 0.321E-02

 656 1/13/1978 dry field runoff 0.301E+04 0.136E+00 0.604E-03

 657 1/14/1978 dry field runoff 0.122E+05 0.327E-01 0.135E-03

 658 1/15/1978 dry field runoff 0.961E+04 0.398E-01 0.165E-03

 659 1/16/1978 dry field runoff 0.435E+04 0.833E-01 0.345E-03

 660 1/17/1978 dry field runoff 0.107E+05 0.334E-01 0.139E-03

 661 1/19/1978 dry field runoff 0.228E+04 0.144E+00 0.653E-03

 662 1/20/1978 dry field runoff 0.145E+04 0.207E+00 0.869E-03

 663 2/ 6/1978 dry field runoff 0.881E+04 0.269E-01 0.129E-03

 664 2/ 7/1978 dry field runoff 0.750E+04 0.297E-01 0.133E-03

 665 2/ 8/1978 dry field runoff 0.940E+04 0.230E-01 0.103E-03

 666 2/ 9/1978 dry field runoff 0.263E+04 0.764E-01 0.344E-03

 667 2/13/1978 dry field runoff 0.505E+04 0.382E-01 0.187E-03

 668 2/14/1978 dry field runoff 0.100E+04 0.163E+00 0.747E-03

 669 3/ 2/1978 dry field runoff 0.933E+03 0.132E+00 0.683E-03

 670 3/ 3/1978 dry field runoff 0.363E+04 0.356E-01 0.174E-03

 671 3/ 4/1978 dry field runoff 0.242E+03 0.335E+00 0.163E-02

 672 3/ 5/1978 dry field runoff 0.895E+04 0.139E-01 0.696E-04

 673 3/ 6/1978 dry field runoff 0.691E+02 0.566E+00 0.276E-02

 674 3/ 9/1978 dry field runoff 0.522E+04 0.216E-01 0.115E-03

 675 3/10/1978 dry field runoff 0.760E+03 0.120E+00 0.597E-03

 676 3/22/1978 dry field runoff 0.518E+03 0.129E+00 0.723E-03

 677 4/ 1/1978 dry field runoff 0.200E+04 0.311E-01 0.182E-03

 678 4/ 5/1978 dry field runoff 0.829E+03 0.615E-01 0.366E-03

 679 4/ 7/1978 dry field runoff 0.411E+04 0.132E-01 0.790E-04

 680 4/16/1978 dry field runoff 0.522E+04 0.836E-02 0.519E-04

 681 4/26/1978 dry field runoff 0.342E+04 0.983E-02 0.632E-04

 682 5/ 1/1978 dry field runoff 0.311E+03 0.677E-01 0.443E-03

 683 5/31/1978 manual release 0.308E+05 0.173E+03 0.475E+01

 684 9/ 6/1978 dry field runoff 0.691E+02 0.696E+02 0.196E+00

 685 9/10/1978 dry field runoff 0.118E+04 0.951E+01 0.268E-01

 686 11/13/1978 dry field runoff 0.235E+04 0.525E+00 0.217E-02

 687 11/20/1978 dry field runoff 0.439E+04 0.243E+00 0.101E-02

 688 11/21/1978 dry field runoff 0.684E+04 0.148E+00 0.562E-03

 689 11/22/1978 dry field runoff 0.529E+04 0.184E+00 0.697E-03

 690 11/23/1978 dry field runoff 0.736E+04 0.128E+00 0.488E-03

 691 12/ 1/1978 dry field runoff 0.242E+03 0.217E+01 0.918E-02

 692 12/ 2/1978 dry field runoff 0.207E+03 0.228E+01 0.920E-02

 693 12/17/1978 dry field runoff 0.484E+03 0.101E+01 0.444E-02

 694 12/18/1978 dry field runoff 0.432E+04 0.135E+00 0.568E-03

 695 12/19/1978 dry field runoff 0.149E+04 0.357E+00 0.148E-02

 696 1/ 4/1979 dry field runoff 0.415E+03 0.845E+00 0.385E-02

 697 1/ 6/1979 dry field runoff 0.657E+03 0.567E+00 0.259E-02

 698 1/ 8/1979 dry field runoff 0.266E+04 0.156E+00 0.715E-03

 699 1/ 9/1979 dry field runoff 0.746E+04 0.544E-01 0.239E-03

 700 1/11/1979 dry field runoff 0.442E+04 0.888E-01 0.411E-03

 701 1/12/1979 dry field runoff 0.781E+04 0.483E-01 0.213E-03

 702 1/15/1979 dry field runoff 0.123E+05 0.298E-01 0.140E-03

 703 1/16/1979 dry field runoff 0.429E+04 0.794E-01 0.352E-03

 704 1/18/1979 dry field runoff 0.190E+04 0.168E+00 0.792E-03

 705 1/31/1979 dry field runoff 0.308E+04 0.871E-01 0.427E-03

 706 2/14/1979 dry field runoff 0.101E+05 0.218E-01 0.111E-03

 707 2/15/1979 dry field runoff 0.588E+03 0.289E+00 0.139E-02

 708 2/17/1979 dry field runoff 0.252E+04 0.776E-01 0.398E-03

 709 2/19/1979 dry field runoff 0.176E+04 0.104E+00 0.533E-03

 710 2/21/1979 dry field runoff 0.785E+04 0.236E-01 0.122E-03
61

 711 2/22/1979 dry field runoff 0.477E+04 0.362E-01 0.178E-03

 712 2/23/1979 dry field runoff 0.228E+04 0.711E-01 0.349E-03

 713 2/27/1979 dry field runoff 0.242E+03 0.422E+00 0.222E-02

 714 3/ 1/1979 dry field runoff 0.349E+04 0.429E-01 0.227E-03

 715 3/ 4/1979 dry field runoff 0.829E+03 0.150E+00 0.800E-03

 716 3/16/1979 dry field runoff 0.715E+04 0.157E-01 0.882E-04

 717 3/17/1979 dry field runoff 0.149E+04 0.662E-01 0.349E-03

 718 3/27/1979 dry field runoff 0.263E+04 0.321E-01 0.188E-03

 719 3/28/1979 dry field runoff 0.574E+04 0.143E-01 0.784E-04

 720 4/ 7/1979 dry field runoff 0.232E+04 0.277E-01 0.169E-03

 721 4/27/1979 dry field runoff 0.968E+03 0.389E-01 0.257E-03

 722 5/31/1979 manual release 0.306E+05 0.174E+03 0.474E+01

 723 7/22/1979 dry field runoff 0.131E+04 0.758E+02 0.131E+00

 724 10/20/1979 dry field runoff 0.138E+03 0.766E+01 0.302E-01

 725 10/21/1979 dry field runoff 0.214E+04 0.894E+00 0.324E-02

 726 10/26/1979 dry field runoff 0.854E+04 0.198E+00 0.794E-03

 727 11/ 4/1979 dry field runoff 0.681E+04 0.185E+00 0.761E-03

 728 11/17/1979 dry field runoff 0.218E+04 0.393E+00 0.167E-02

 729 11/23/1979 dry field runoff 0.111E+04 0.630E+00 0.273E-02

 730 11/26/1979 dry field runoff 0.415E+03 0.131E+01 0.569E-02

 731 12/20/1979 dry field runoff 0.422E+04 0.107E+00 0.499E-03

 732 12/21/1979 dry field runoff 0.194E+04 0.213E+00 0.931E-03

 733 12/22/1979 dry field runoff 0.691E+02 0.202E+01 0.882E-02

 734 12/24/1979 dry field runoff 0.854E+04 0.487E-01 0.228E-03

 735 12/25/1979 dry field runoff 0.563E+04 0.691E-01 0.305E-03

 736 12/26/1979 dry field runoff 0.176E+04 0.203E+00 0.897E-03

 737 12/31/1979 dry field runoff 0.207E+04 0.163E+00 0.774E-03

 738 1/ 1/1980 dry field runoff 0.249E+04 0.130E+00 0.585E-03

 739 1/ 2/1980 dry field runoff 0.346E+02 0.186E+01 0.834E-02

 740 1/10/1980 dry field runoff 0.660E+04 0.444E-01 0.217E-03

 741 1/11/1980 dry field runoff 0.225E+04 0.119E+00 0.547E-03

 742 1/12/1980 dry field runoff 0.106E+05 0.256E-01 0.119E-03

 743 1/13/1980 dry field runoff 0.325E+04 0.783E-01 0.363E-03

 744 1/14/1980 dry field runoff 0.757E+04 0.334E-01 0.155E-03

 745 1/15/1980 dry field runoff 0.518E+04 0.467E-01 0.218E-03

 746 1/16/1980 dry field runoff 0.152E+04 0.145E+00 0.675E-03

 747 1/17/1980 dry field runoff 0.283E+04 0.784E-01 0.368E-03

 748 1/18/1980 dry field runoff 0.525E+04 0.418E-01 0.196E-03

 749 2/ 6/1980 dry field runoff 0.173E+03 0.523E+00 0.276E-02

 750 2/15/1980 dry field runoff 0.556E+04 0.249E-01 0.135E-03

 751 2/16/1980 dry field runoff 0.788E+04 0.167E-01 0.860E-04

 752 2/17/1980 dry field runoff 0.702E+04 0.181E-01 0.935E-04

 753 2/18/1980 dry field runoff 0.757E+04 0.163E-01 0.842E-04

 754 2/19/1980 dry field runoff 0.270E+04 0.428E-01 0.222E-03

 755 2/20/1980 dry field runoff 0.114E+05 0.102E-01 0.530E-04

 756 2/21/1980 dry field runoff 0.484E+04 0.229E-01 0.119E-03

 757 2/22/1980 dry field runoff 0.297E+04 0.354E-01 0.184E-03

 758 2/23/1980 dry field runoff 0.795E+03 0.114E+00 0.594E-03

 759 2/28/1980 dry field runoff 0.536E+04 0.179E-01 0.101E-03

 760 3/ 3/1980 dry field runoff 0.470E+04 0.185E-01 0.106E-03

 761 3/ 4/1980 dry field runoff 0.290E+04 0.278E-01 0.150E-03

 762 3/ 5/1980 dry field runoff 0.104E+03 0.330E+00 0.178E-02

 763 3/ 6/1980 dry field runoff 0.435E+04 0.179E-01 0.101E-03

 764 3/ 7/1980 dry field runoff 0.142E+04 0.491E-01 0.267E-03

 765 3/26/1980 dry field runoff 0.567E+04 0.921E-02 0.568E-04

 766 4/ 5/1980 dry field runoff 0.207E+04 0.196E-01 0.125E-03

 767 4/ 6/1980 dry field runoff 0.242E+04 0.160E-01 0.967E-04

 768 4/23/1980 dry field runoff 0.128E+04 0.199E-01 0.138E-03

 769 5/10/1980 dry field runoff 0.325E+04 0.526E-02 0.396E-04

 770 5/31/1980 manual release 0.323E+05 0.166E+03 0.402E+01

 771 7/ 3/1980 dry field runoff 0.235E+04 0.130E+03 0.144E+00

 772 10/14/1980 dry field runoff 0.104E+03 0.227E+02 0.734E-01

 773 11/23/1980 dry field runoff 0.691E+03 0.216E+01 0.813E-02
62

 774 12/ 3/1980 dry field runoff 0.484E+03 0.231E+01 0.894E-02

 775 12/ 4/1980 dry field runoff 0.764E+04 0.177E+00 0.637E-03

 776 12/ 5/1980 dry field runoff 0.159E+04 0.762E+00 0.269E-02

 777 12/22/1980 dry field runoff 0.404E+04 0.240E+00 0.967E-03

 778 1/ 4/1981 dry field runoff 0.553E+03 0.117E+01 0.486E-02

 779 1/18/1981 dry field runoff 0.104E+03 0.263E+01 0.114E-01

 780 1/21/1981 dry field runoff 0.691E+02 0.289E+01 0.127E-01

 781 1/23/1981 dry field runoff 0.105E+05 0.557E-01 0.247E-03

 782 1/24/1981 dry field runoff 0.346E+04 0.156E+00 0.645E-03

 783 1/27/1981 dry field runoff 0.346E+04 0.149E+00 0.668E-03

 784 1/28/1981 dry field runoff 0.117E+05 0.430E-01 0.181E-03

 785 1/29/1981 dry field runoff 0.688E+04 0.701E-01 0.294E-03

 786 1/30/1981 dry field runoff 0.346E+03 0.973E+00 0.409E-02

 787 2/ 9/1981 dry field runoff 0.415E+03 0.736E+00 0.341E-02

 788 2/14/1981 dry field runoff 0.169E+04 0.203E+00 0.960E-03

 789 2/26/1981 dry field runoff 0.346E+03 0.608E+00 0.299E-02

 790 2/27/1981 dry field runoff 0.415E+03 0.508E+00 0.239E-02

 791 3/ 1/1981 dry field runoff 0.346E+02 0.154E+01 0.763E-02

 792 3/ 5/1981 dry field runoff 0.543E+04 0.458E-01 0.231E-03

 793 3/16/1981 dry field runoff 0.795E+04 0.252E-01 0.132E-03

 794 3/19/1981 dry field runoff 0.798E+04 0.233E-01 0.123E-03

 795 3/20/1981 dry field runoff 0.290E+04 0.585E-01 0.290E-03

 796 3/21/1981 dry field runoff 0.415E+03 0.309E+00 0.153E-02

 797 3/26/1981 dry field runoff 0.266E+04 0.567E-01 0.305E-03

 798 4/19/1981 dry field runoff 0.622E+03 0.127E+00 0.753E-03

 799 4/20/1981 dry field runoff 0.408E+04 0.219E-01 0.123E-03

 800 5/19/1981 dry field runoff 0.339E+04 0.128E-01 0.881E-04

 801 5/31/1981 manual release 0.322E+05 0.166E+03 0.430E+01

 802 9/25/1981 dry field runoff 0.104E+04 0.524E+01 0.172E-01

 803 10/ 8/1981 dry field runoff 0.308E+04 0.119E+01 0.413E-02

 804 10/11/1981 dry field runoff 0.232E+04 0.139E+01 0.487E-02

 805 10/28/1981 dry field runoff 0.228E+04 0.821E+00 0.314E-02

 806 10/29/1981 dry field runoff 0.930E+04 0.197E+00 0.649E-03

 807 11/ 6/1981 dry field runoff 0.346E+02 0.828E+01 0.330E-01

 808 11/13/1981 dry field runoff 0.175E+05 0.680E-01 0.282E-03

 809 11/14/1981 dry field runoff 0.143E+05 0.776E-01 0.280E-03

 810 11/17/1981 dry field runoff 0.124E+04 0.743E+00 0.314E-02

 811 11/18/1981 dry field runoff 0.415E+03 0.173E+01 0.644E-02

 812 11/22/1981 dry field runoff 0.522E+04 0.161E+00 0.694E-03

 813 11/28/1981 dry field runoff 0.798E+04 0.884E-01 0.390E-03

 814 12/10/1981 dry field runoff 0.518E+03 0.794E+00 0.360E-02

 815 12/13/1981 dry field runoff 0.622E+03 0.636E+00 0.290E-02

 816 12/14/1981 dry field runoff 0.138E+03 0.163E+01 0.694E-02

 817 12/19/1981 dry field runoff 0.401E+04 0.102E+00 0.470E-03

 818 12/20/1981 dry field runoff 0.736E+04 0.531E-01 0.227E-03

 819 12/21/1981 dry field runoff 0.190E+04 0.188E+00 0.806E-03

 820 12/29/1981 dry field runoff 0.449E+03 0.565E+00 0.267E-02

 821 12/30/1981 dry field runoff 0.833E+04 0.377E-01 0.169E-03

 822 1/ 1/1982 dry field runoff 0.128E+04 0.217E+00 0.103E-02

 823 1/ 2/1982 dry field runoff 0.297E+04 0.937E-01 0.420E-03

 824 1/ 4/1982 dry field runoff 0.173E+04 0.151E+00 0.726E-03

 825 1/ 5/1982 dry field runoff 0.257E+05 0.104E-01 0.468E-04

 826 1/ 6/1982 dry field runoff 0.394E+04 0.633E-01 0.285E-03

 827 1/20/1982 dry field runoff 0.104E+04 0.176E+00 0.875E-03

 828 1/21/1982 dry field runoff 0.311E+04 0.607E-01 0.288E-03

 829 1/27/1982 dry field runoff 0.968E+03 0.164E+00 0.827E-03

 830 1/29/1982 dry field runoff 0.442E+04 0.383E-01 0.193E-03

 831 2/14/1982 dry field runoff 0.442E+04 0.303E-01 0.160E-03

 832 2/15/1982 dry field runoff 0.415E+04 0.305E-01 0.153E-03

 833 2/16/1982 dry field runoff 0.105E+05 0.119E-01 0.600E-04

 834 3/ 2/1982 dry field runoff 0.785E+04 0.126E-01 0.707E-04

 835 3/ 3/1982 dry field runoff 0.511E+04 0.181E-01 0.953E-04

 836 3/11/1982 dry field runoff 0.197E+04 0.389E-01 0.225E-03
63

 837 3/12/1982 dry field runoff 0.380E+03 0.148E+00 0.807E-03

 838 3/15/1982 dry field runoff 0.173E+04 0.394E-01 0.231E-03

 839 3/17/1982 dry field runoff 0.187E+04 0.346E-01 0.204E-03

 840 3/18/1982 dry field runoff 0.477E+04 0.133E-01 0.743E-04

 841 3/19/1982 dry field runoff 0.242E+03 0.164E+00 0.909E-03

 842 3/27/1982 dry field runoff 0.180E+04 0.283E-01 0.172E-03

 843 3/29/1982 dry field runoff 0.159E+04 0.300E-01 0.183E-03

 844 3/30/1982 dry field runoff 0.577E+04 0.830E-02 0.480E-04

 845 3/31/1982 dry field runoff 0.377E+04 0.121E-01 0.699E-04

 846 4/ 1/1982 dry field runoff 0.159E+05 0.286E-02 0.165E-04

 847 4/ 2/1982 dry field runoff 0.100E+04 0.385E-01 0.223E-03

 848 4/ 3/1982 dry field runoff 0.118E+04 0.324E-01 0.190E-03

 849 4/ 4/1982 dry field runoff 0.795E+03 0.440E-01 0.258E-03

 850 4/11/1982 dry field runoff 0.125E+05 0.289E-02 0.182E-04

 851 4/12/1982 dry field runoff 0.608E+04 0.556E-02 0.332E-04

 852 5/31/1982 manual release 0.326E+05 0.164E+03 0.426E+01

 853 9/16/1982 dry field runoff 0.194E+04 0.815E+01 0.218E-01

 854 9/19/1982 dry field runoff 0.339E+04 0.419E+01 0.113E-01

 855 9/24/1982 dry field runoff 0.933E+03 0.112E+02 0.306E-01

 856 9/26/1982 dry field runoff 0.477E+04 0.224E+01 0.616E-02

 857 10/26/1982 dry field runoff 0.112E+05 0.373E+00 0.118E-02

 858 10/30/1982 dry field runoff 0.525E+04 0.688E+00 0.221E-02

 859 10/31/1982 dry field runoff 0.449E+04 0.748E+00 0.203E-02

 860 11/10/1982 dry field runoff 0.211E+04 0.120E+01 0.400E-02

 861 11/11/1982 dry field runoff 0.162E+04 0.144E+01 0.418E-02

 862 11/18/1982 dry field runoff 0.636E+04 0.340E+00 0.114E-02

 863 11/19/1982 dry field runoff 0.152E+05 0.136E+00 0.406E-03

 864 11/23/1982 dry field runoff 0.563E+04 0.337E+00 0.113E-02

 865 11/24/1982 dry field runoff 0.107E+04 0.151E+01 0.459E-02

 866 11/28/1982 dry field runoff 0.138E+03 0.615E+01 0.207E-01

 867 11/29/1982 dry field runoff 0.263E+04 0.603E+00 0.195E-02

 868 11/30/1982 dry field runoff 0.802E+04 0.196E+00 0.608E-03

 869 12/ 1/1982 dry field runoff 0.467E+04 0.322E+00 0.996E-03

 870 12/ 3/1982 dry field runoff 0.173E+03 0.477E+01 0.162E-01

 871 12/13/1982 dry field runoff 0.131E+04 0.881E+00 0.308E-02

 872 12/16/1982 dry field runoff 0.346E+02 0.677E+01 0.238E-01

 873 12/21/1982 dry field runoff 0.505E+04 0.215E+00 0.769E-03

 874 12/22/1982 dry field runoff 0.132E+05 0.791E-01 0.262E-03

 875 12/23/1982 dry field runoff 0.695E+04 0.144E+00 0.477E-03

 876 1/16/1983 dry field runoff 0.518E+03 0.112E+01 0.425E-02

 877 1/17/1983 dry field runoff 0.138E+04 0.466E+00 0.168E-02

 878 1/19/1983 dry field runoff 0.529E+04 0.128E+00 0.487E-03

 879 1/23/1983 dry field runoff 0.674E+04 0.946E-01 0.363E-03

 880 1/24/1983 dry field runoff 0.560E+04 0.108E+00 0.390E-03

 881 1/25/1983 dry field runoff 0.204E+04 0.275E+00 0.997E-03

 882 1/27/1983 dry field runoff 0.802E+04 0.722E-01 0.279E-03

 883 1/28/1983 dry field runoff 0.159E+04 0.322E+00 0.117E-02

 884 1/29/1983 dry field runoff 0.221E+04 0.231E+00 0.846E-03

 885 1/30/1983 dry field runoff 0.363E+04 0.140E+00 0.513E-03

 886 2/ 6/1983 dry field runoff 0.173E+04 0.256E+00 0.103E-02

 887 2/ 7/1983 dry field runoff 0.391E+04 0.112E+00 0.422E-03

 888 2/ 8/1983 dry field runoff 0.109E+05 0.399E-01 0.150E-03

 889 2/ 9/1983 dry field runoff 0.276E+03 0.101E+01 0.380E-02

 890 2/13/1983 dry field runoff 0.377E+04 0.103E+00 0.425E-03

 891 2/19/1983 dry field runoff 0.114E+04 0.278E+00 0.117E-02

 892 2/24/1983 dry field runoff 0.207E+03 0.912E+00 0.392E-02

 893 2/26/1983 dry field runoff 0.591E+04 0.504E-01 0.218E-03

 894 2/27/1983 dry field runoff 0.283E+04 0.964E-01 0.385E-03

 895 2/28/1983 dry field runoff 0.252E+04 0.104E+00 0.417E-03

 896 3/ 1/1983 dry field runoff 0.639E+04 0.409E-01 0.165E-03

 897 3/ 2/1983 dry field runoff 0.435E+04 0.573E-01 0.231E-03

 898 3/ 3/1983 dry field runoff 0.194E+04 0.120E+00 0.483E-03

 899 3/ 4/1983 dry field runoff 0.187E+04 0.119E+00 0.485E-03
64

 900 3/ 6/1983 dry field runoff 0.380E+03 0.443E+00 0.196E-02

 901 3/ 7/1983 dry field runoff 0.290E+04 0.724E-01 0.303E-03

 902 3/ 8/1983 dry field runoff 0.726E+03 0.243E+00 0.996E-03

 903 3/13/1983 dry field runoff 0.999E+04 0.189E-01 0.865E-04

 904 3/14/1983 dry field runoff 0.829E+04 0.214E-01 0.893E-04

 905 3/17/1983 dry field runoff 0.359E+04 0.455E-01 0.210E-03

 906 3/18/1983 dry field runoff 0.346E+03 0.327E+00 0.139E-02

 907 3/21/1983 dry field runoff 0.570E+04 0.260E-01 0.121E-03

 908 3/23/1983 dry field runoff 0.353E+04 0.390E-01 0.183E-03

 909 3/24/1983 dry field runoff 0.356E+04 0.364E-01 0.158E-03

 910 3/25/1983 dry field runoff 0.518E+03 0.196E+00 0.851E-03

 911 3/28/1983 dry field runoff 0.726E+03 0.142E+00 0.674E-03

 912 3/29/1983 dry field runoff 0.899E+03 0.112E+00 0.498E-03

 913 4/19/1983 dry field runoff 0.280E+04 0.261E-01 0.135E-03

 914 4/24/1983 dry field runoff 0.477E+04 0.138E-01 0.729E-04

 915 4/25/1983 dry field runoff 0.263E+04 0.231E-01 0.113E-03

 916 4/28/1983 dry field runoff 0.460E+04 0.127E-01 0.679E-04

 917 4/29/1983 dry field runoff 0.107E+05 0.522E-02 0.259E-04

 918 4/30/1983 dry field runoff 0.484E+04 0.109E-01 0.543E-04

 919 5/ 6/1983 dry field runoff 0.131E+04 0.331E-01 0.182E-03

 920 5/31/1983 manual release 0.330E+05 0.163E+03 0.403E+01

 921 6/ 2/1983 dry field runoff 0.162E+04 0.469E+03 0.315E+00

 922 10/ 1/1983 dry field runoff 0.353E+04 0.134E+01 0.470E-02

 923 10/30/1983 dry field runoff 0.169E+04 0.853E+00 0.348E-02

 924 11/10/1983 dry field runoff 0.190E+04 0.527E+00 0.226E-02

 925 11/11/1983 dry field runoff 0.114E+05 0.870E-01 0.328E-03

 926 11/13/1983 dry field runoff 0.553E+03 0.137E+01 0.588E-02

 927 11/14/1983 dry field runoff 0.829E+04 0.106E+00 0.412E-03

 928 11/16/1983 dry field runoff 0.100E+04 0.739E+00 0.320E-02

 929 11/17/1983 dry field runoff 0.380E+04 0.201E+00 0.782E-03

 930 11/18/1983 dry field runoff 0.536E+04 0.138E+00 0.530E-03

 931 11/20/1983 dry field runoff 0.104E+03 0.292E+01 0.127E-01

 932 11/21/1983 dry field runoff 0.380E+03 0.132E+01 0.551E-02

 933 11/24/1983 dry field runoff 0.311E+03 0.140E+01 0.618E-02

 934 11/25/1983 dry field runoff 0.328E+04 0.177E+00 0.724E-03

 935 12/ 4/1983 dry field runoff 0.498E+04 0.974E-01 0.437E-03

 936 12/ 9/1983 dry field runoff 0.276E+03 0.106E+01 0.480E-02

 937 12/10/1983 dry field runoff 0.353E+04 0.116E+00 0.500E-03

 938 12/11/1983 dry field runoff 0.211E+04 0.181E+00 0.761E-03

 939 12/12/1983 dry field runoff 0.104E+04 0.333E+00 0.141E-02

 940 12/17/1983 dry field runoff 0.726E+03 0.414E+00 0.192E-02

 941 12/23/1983 dry field runoff 0.622E+03 0.414E+00 0.196E-02

 942 12/24/1983 dry field runoff 0.190E+04 0.147E+00 0.657E-03

 943 12/25/1983 dry field runoff 0.164E+05 0.176E-01 0.778E-04

 944 12/26/1983 dry field runoff 0.505E+04 0.539E-01 0.238E-03

 945 12/27/1983 dry field runoff 0.118E+04 0.205E+00 0.908E-03

 946 12/31/1983 dry field runoff 0.169E+04 0.137E+00 0.665E-03

 947 1/16/1984 dry field runoff 0.276E+03 0.442E+00 0.224E-02

 948 2/13/1984 dry field runoff 0.104E+04 0.971E-01 0.539E-03

 949 2/14/1984 dry field runoff 0.235E+04 0.436E-01 0.230E-03

 950 2/16/1984 dry field runoff 0.263E+04 0.380E-01 0.212E-03

 951 2/21/1984 dry field runoff 0.760E+03 0.105E+00 0.594E-03

 952 3/14/1984 dry field runoff 0.391E+04 0.151E-01 0.933E-04

 953 3/16/1984 dry field runoff 0.207E+03 0.165E+00 0.102E-02

 954 3/17/1984 dry field runoff 0.114E+04 0.430E-01 0.258E-03

 955 4/ 1/1984 dry field runoff 0.339E+04 0.111E-01 0.741E-04

 956 4/19/1984 dry field runoff 0.276E+03 0.594E-01 0.427E-03

 957 4/20/1984 dry field runoff 0.138E+03 0.841E-01 0.580E-03

 958 5/31/1984 manual release 0.307E+05 0.173E+03 0.536E+01

 959 10/11/1984 dry field runoff 0.453E+04 0.442E+00 0.185E-02

 960 10/17/1984 dry field runoff 0.283E+04 0.536E+00 0.230E-02

 961 11/ 7/1984 dry field runoff 0.795E+03 0.867E+00 0.398E-02

 962 11/ 8/1984 dry field runoff 0.321E+04 0.228E+00 0.950E-03
65

 963 11/ 9/1984 dry field runoff 0.107E+04 0.602E+00 0.248E-02

 964 11/11/1984 dry field runoff 0.270E+04 0.247E+00 0.114E-02

 965 11/12/1984 dry field runoff 0.346E+03 0.134E+01 0.559E-02

 966 11/13/1984 dry field runoff 0.456E+04 0.135E+00 0.582E-03

 967 11/14/1984 dry field runoff 0.166E+04 0.337E+00 0.141E-02

 968 11/16/1984 dry field runoff 0.484E+03 0.929E+00 0.432E-02

 969 11/17/1984 dry field runoff 0.183E+04 0.279E+00 0.121E-02

 970 11/18/1984 dry field runoff 0.118E+04 0.400E+00 0.171E-02

 971 11/21/1984 dry field runoff 0.169E+04 0.269E+00 0.127E-02

 972 11/24/1984 dry field runoff 0.553E+03 0.650E+00 0.310E-02

 973 11/25/1984 dry field runoff 0.225E+04 0.179E+00 0.796E-03

 974 11/28/1984 dry field runoff 0.314E+04 0.122E+00 0.588E-03

 975 12/ 3/1984 dry field runoff 0.349E+04 0.981E-01 0.478E-03

 976 12/ 4/1984 dry field runoff 0.138E+03 0.119E+01 0.535E-02

 977 12/10/1984 dry field runoff 0.311E+03 0.666E+00 0.330E-02

 978 12/11/1984 dry field runoff 0.270E+04 0.102E+00 0.480E-03

 979 12/16/1984 dry field runoff 0.211E+04 0.117E+00 0.587E-03

 980 1/ 8/1985 dry field runoff 0.363E+04 0.478E-01 0.253E-03

 981 1/10/1985 dry field runoff 0.829E+03 0.177E+00 0.939E-03

 982 1/27/1985 dry field runoff 0.691E+02 0.638E+00 0.351E-02

 983 1/29/1985 dry field runoff 0.691E+02 0.618E+00 0.342E-02

 984 2/ 8/1985 dry field runoff 0.435E+04 0.254E-01 0.145E-03

 985 2/ 9/1985 dry field runoff 0.788E+04 0.135E-01 0.738E-04

 986 3/ 6/1985 dry field runoff 0.183E+04 0.369E-01 0.230E-03

 987 3/ 7/1985 dry field runoff 0.252E+04 0.258E-01 0.153E-03

 988 3/10/1985 dry field runoff 0.346E+03 0.133E+00 0.842E-03

 989 3/11/1985 dry field runoff 0.391E+04 0.154E-01 0.934E-04

 990 3/27/1985 dry field runoff 0.477E+04 0.922E-02 0.617E-04

 991 3/28/1985 dry field runoff 0.276E+03 0.102E+00 0.645E-03

 992 5/31/1985 manual release 0.326E+05 0.164E+03 0.413E+01

 993 9/10/1985 dry field runoff 0.173E+04 0.611E+01 0.174E-01

 994 10/21/1985 dry field runoff 0.180E+04 0.134E+01 0.503E-02

 995 10/22/1985 dry field runoff 0.138E+04 0.159E+01 0.504E-02

 996 11/11/1985 dry field runoff 0.308E+04 0.429E+00 0.173E-02

 997 11/12/1985 dry field runoff 0.149E+04 0.795E+00 0.285E-02

 998 11/17/1985 dry field runoff 0.242E+03 0.302E+01 0.122E-01

 999 11/24/1985 dry field runoff 0.622E+03 0.130E+01 0.536E-02

1000 11/25/1985 dry field runoff 0.162E+05 0.578E-01 0.221E-03

1001 11/26/1985 dry field runoff 0.242E+03 0.235E+01 0.887E-02

1002 11/29/1985 dry field runoff 0.349E+04 0.239E+00 0.994E-03

1003 11/30/1985 dry field runoff 0.384E+04 0.206E+00 0.791E-03

1004 12/ 2/1985 dry field runoff 0.242E+04 0.311E+00 0.130E-02

1005 12/ 3/1985 dry field runoff 0.467E+04 0.157E+00 0.606E-03

1006 12/ 6/1985 dry field runoff 0.152E+04 0.433E+00 0.182E-02

1007 12/ 7/1985 dry field runoff 0.107E+04 0.561E+00 0.220E-02

1008 12/ 8/1985 dry field runoff 0.104E+03 0.267E+01 0.105E-01

1009 12/18/1985 dry field runoff 0.104E+03 0.231E+01 0.996E-02

1010 12/29/1985 dry field runoff 0.138E+03 0.172E+01 0.758E-02

1011 12/30/1985 dry field runoff 0.667E+04 0.687E-01 0.296E-03

1012 12/31/1985 dry field runoff 0.135E+04 0.301E+00 0.126E-02

1013 1/ 4/1986 dry field runoff 0.138E+03 0.152E+01 0.679E-02

1014 1/ 5/1986 dry field runoff 0.612E+04 0.662E-01 0.289E-03

1015 1/ 6/1986 dry field runoff 0.138E+03 0.141E+01 0.597E-02

1016 1/15/1986 dry field runoff 0.183E+04 0.181E+00 0.833E-03

1017 1/16/1986 dry field runoff 0.311E+03 0.745E+00 0.325E-02

1018 1/17/1986 dry field runoff 0.290E+04 0.109E+00 0.485E-03

1019 1/23/1986 dry field runoff 0.173E+03 0.953E+00 0.452E-02

1020 1/29/1986 dry field runoff 0.104E+03 0.109E+01 0.529E-02

1021 1/30/1986 dry field runoff 0.847E+04 0.301E-01 0.143E-03

1022 1/31/1986 dry field runoff 0.463E+04 0.517E-01 0.236E-03

1023 2/ 1/1986 dry field runoff 0.349E+04 0.656E-01 0.301E-03

1024 2/ 3/1986 dry field runoff 0.235E+04 0.927E-01 0.458E-03

1025 2/ 4/1986 dry field runoff 0.104E+04 0.185E+00 0.855E-03
66

1026 2/13/1986 dry field runoff 0.563E+04 0.322E-01 0.165E-03

1027 2/14/1986 dry field runoff 0.124E+04 0.126E+00 0.604E-03

1028 2/15/1986 dry field runoff 0.197E+04 0.803E-01 0.387E-03

1029 2/16/1986 dry field runoff 0.650E+04 0.247E-01 0.119E-03

1030 2/17/1986 dry field runoff 0.119E+05 0.131E-01 0.630E-04

1031 2/18/1986 dry field runoff 0.227E+05 0.665E-02 0.321E-04

1032 2/19/1986 dry field runoff 0.144E+05 0.101E-01 0.488E-04

1033 2/20/1986 dry field runoff 0.691E+03 0.169E+00 0.820E-03

1034 3/ 8/1986 dry field runoff 0.563E+04 0.176E-01 0.987E-04

1035 3/ 9/1986 dry field runoff 0.829E+03 0.982E-01 0.510E-03

1036 3/10/1986 dry field runoff 0.204E+04 0.423E-01 0.223E-03

1037 3/11/1986 dry field runoff 0.629E+04 0.138E-01 0.723E-04

1038 3/12/1986 dry field runoff 0.933E+03 0.789E-01 0.414E-03

1039 3/16/1986 dry field runoff 0.550E+04 0.138E-01 0.798E-04

1040 3/17/1986 dry field runoff 0.346E+03 0.149E+00 0.797E-03

1041 4/ 6/1986 dry field runoff 0.276E+03 0.108E+00 0.683E-03

1042 4/ 7/1986 dry field runoff 0.657E+03 0.539E-01 0.325E-03

1043 4/ 8/1986 dry field runoff 0.453E+04 0.885E-02 0.530E-04

1044 5/31/1986 manual release 0.327E+05 0.163E+03 0.431E+01

1045 9/25/1986 dry field runoff 0.259E+04 0.259E+01 0.806E-02

1046 11/29/1986 dry field runoff 0.795E+03 0.116E+01 0.492E-02

1047 12/ 6/1986 dry field runoff 0.131E+04 0.635E+00 0.274E-02

1048 12/14/1986 dry field runoff 0.173E+03 0.247E+01 0.108E-01

1049 12/19/1986 dry field runoff 0.864E+03 0.703E+00 0.313E-02

1050 12/20/1986 dry field runoff 0.121E+04 0.497E+00 0.208E-02

1051 12/23/1986 dry field runoff 0.183E+04 0.325E+00 0.146E-02

1052 1/ 1/1987 dry field runoff 0.104E+03 0.222E+01 0.101E-01

1053 1/ 2/1987 dry field runoff 0.346E+03 0.109E+01 0.486E-02

1054 1/ 4/1987 dry field runoff 0.556E+04 0.904E-01 0.415E-03

1055 1/ 7/1987 dry field runoff 0.218E+04 0.209E+00 0.966E-03

1056 1/24/1987 dry field runoff 0.221E+04 0.159E+00 0.767E-03

1057 1/25/1987 dry field runoff 0.180E+04 0.183E+00 0.840E-03

1058 1/28/1987 dry field runoff 0.301E+04 0.109E+00 0.530E-03

1059 1/29/1987 dry field runoff 0.484E+03 0.517E+00 0.239E-02

1060 1/31/1987 dry field runoff 0.200E+04 0.148E+00 0.726E-03

1061 2/ 3/1987 dry field runoff 0.753E+04 0.390E-01 0.193E-03

1062 2/11/1987 dry field runoff 0.166E+04 0.144E+00 0.734E-03

1063 2/12/1987 dry field runoff 0.864E+03 0.245E+00 0.118E-02

1064 2/13/1987 dry field runoff 0.757E+04 0.310E-01 0.150E-03

1065 2/14/1987 dry field runoff 0.511E+04 0.438E-01 0.211E-03

1066 2/15/1987 dry field runoff 0.121E+04 0.164E+00 0.794E-03

1067 2/16/1987 dry field runoff 0.311E+03 0.474E+00 0.231E-02

1068 3/ 6/1987 dry field runoff 0.124E+05 0.124E-01 0.687E-04

1069 3/11/1987 dry field runoff 0.242E+03 0.359E+00 0.202E-02

1070 3/13/1987 dry field runoff 0.273E+04 0.459E-01 0.259E-03

1071 3/15/1987 dry field runoff 0.232E+04 0.507E-01 0.287E-03

1072 3/22/1987 dry field runoff 0.128E+04 0.754E-01 0.437E-03

1073 3/24/1987 dry field runoff 0.363E+04 0.269E-01 0.157E-03

1074 5/31/1987 manual release 0.321E+05 0.164E+03 0.504E+01

1075 10/23/1987 dry field runoff 0.346E+02 0.155E+02 0.594E-01

1076 10/24/1987 dry field runoff 0.726E+04 0.358E+00 0.133E-02

1077 10/28/1987 dry field runoff 0.346E+03 0.465E+01 0.182E-01

1078 10/29/1987 dry field runoff 0.899E+03 0.205E+01 0.710E-02

1079 11/14/1987 dry field runoff 0.287E+04 0.441E+00 0.183E-02

1080 11/18/1987 dry field runoff 0.677E+04 0.170E+00 0.712E-03

1081 11/21/1987 dry field runoff 0.418E+04 0.248E+00 0.105E-02

1082 12/ 1/1987 dry field runoff 0.653E+04 0.126E+00 0.545E-03

1083 12/ 2/1987 dry field runoff 0.142E+04 0.509E+00 0.201E-02

1084 12/ 5/1987 dry field runoff 0.467E+04 0.157E+00 0.683E-03

1085 12/ 7/1987 dry field runoff 0.314E+04 0.216E+00 0.945E-03

1086 12/ 9/1987 dry field runoff 0.225E+04 0.281E+00 0.123E-02

1087 12/17/1987 dry field runoff 0.453E+04 0.121E+00 0.546E-03

1088 12/23/1987 dry field runoff 0.204E+04 0.230E+00 0.105E-02
67

1089 12/28/1987 dry field runoff 0.795E+03 0.483E+00 0.222E-02

1090 12/29/1987 dry field runoff 0.429E+04 0.972E-01 0.423E-03

1091 12/30/1987 dry field runoff 0.138E+03 0.147E+01 0.635E-02

1092 1/ 3/1988 dry field runoff 0.104E+04 0.335E+00 0.156E-02

1093 1/ 4/1988 dry field runoff 0.380E+04 0.952E-01 0.420E-03

1094 1/ 5/1988 dry field runoff 0.370E+04 0.945E-01 0.415E-03

1095 1/ 8/1988 dry field runoff 0.346E+02 0.196E+01 0.917E-02

1096 1/16/1988 dry field runoff 0.180E+04 0.160E+00 0.767E-03

1097 1/17/1988 dry field runoff 0.608E+04 0.473E-01 0.215E-03

1098 1/18/1988 dry field runoff 0.636E+04 0.438E-01 0.199E-03

1099 1/30/1988 dry field runoff 0.622E+03 0.312E+00 0.156E-02

1100 2/29/1988 dry field runoff 0.156E+04 0.814E-01 0.456E-03

1101 3/ 1/1988 dry field runoff 0.584E+04 0.218E-01 0.115E-03

1102 3/ 2/1988 dry field runoff 0.657E+03 0.157E+00 0.825E-03

1103 4/20/1988 dry field runoff 0.791E+04 0.484E-02 0.344E-04

1104 4/21/1988 dry field runoff 0.283E+04 0.122E-01 0.809E-04

1105 4/23/1988 dry field runoff 0.760E+03 0.384E-01 0.275E-03

1106 5/ 8/1988 dry field runoff 0.463E+04 0.481E-02 0.367E-04

1107 5/17/1988 dry field runoff 0.968E+03 0.161E-01 0.128E-03

1108 5/31/1988 manual release 0.328E+05 0.163E+03 0.427E+01

1109 9/ 6/1988 dry field runoff 0.225E+04 0.465E+01 0.142E-01

1110 10/14/1988 dry field runoff 0.622E+03 0.277E+01 0.109E-01

1111 11/14/1988 dry field runoff 0.111E+04 0.621E+00 0.286E-02

1112 11/17/1988 dry field runoff 0.183E+04 0.356E+00 0.165E-02

1113 11/24/1988 dry field runoff 0.636E+04 0.900E-01 0.423E-03

1114 11/25/1988 dry field runoff 0.795E+03 0.585E+00 0.251E-02

1115 12/20/1988 dry field runoff 0.674E+04 0.499E-01 0.252E-03

1116 12/21/1988 dry field runoff 0.543E+04 0.582E-01 0.276E-03

1117 12/23/1988 dry field runoff 0.314E+04 0.959E-01 0.486E-03

1118 12/24/1988 dry field runoff 0.588E+03 0.407E+00 0.194E-02

1119 12/25/1988 dry field runoff 0.214E+04 0.127E+00 0.613E-03

1120 12/28/1988 dry field runoff 0.145E+04 0.174E+00 0.888E-03

1121 12/31/1988 dry field runoff 0.933E+03 0.242E+00 0.124E-02

1122 1/ 1/1989 dry field runoff 0.449E+03 0.417E+00 0.204E-02

1123 1/ 6/1989 dry field runoff 0.180E+04 0.119E+00 0.619E-03

1124 1/ 7/1989 dry field runoff 0.173E+03 0.693E+00 0.343E-02

1125 1/ 8/1989 dry field runoff 0.145E+04 0.136E+00 0.687E-03

1126 1/24/1989 dry field runoff 0.518E+03 0.264E+00 0.142E-02

1127 2/ 4/1989 dry field runoff 0.342E+04 0.417E-01 0.232E-03

1128 2/ 9/1989 dry field runoff 0.829E+03 0.140E+00 0.786E-03

1129 2/10/1989 dry field runoff 0.491E+04 0.256E-01 0.139E-03

1130 2/19/1989 dry field runoff 0.380E+03 0.219E+00 0.126E-02

1131 3/ 2/1989 dry field runoff 0.391E+04 0.236E-01 0.141E-03

1132 3/ 3/1989 dry field runoff 0.394E+04 0.221E-01 0.126E-03

1133 3/ 5/1989 dry field runoff 0.114E+04 0.687E-01 0.412E-03

1134 3/ 6/1989 dry field runoff 0.235E+04 0.335E-01 0.193E-03

1135 3/ 8/1989 dry field runoff 0.726E+03 0.935E-01 0.566E-03

1136 3/ 9/1989 dry field runoff 0.183E+04 0.391E-01 0.227E-03

1137 3/10/1989 dry field runoff 0.477E+04 0.151E-01 0.879E-04

1138 3/11/1989 dry field runoff 0.760E+04 0.927E-02 0.538E-04

1139 3/17/1989 dry field runoff 0.111E+04 0.513E-01 0.323E-03

1140 3/19/1989 dry field runoff 0.467E+04 0.126E-01 0.797E-04

1141 3/24/1989 dry field runoff 0.242E+04 0.209E-01 0.135E-03

1142 3/25/1989 dry field runoff 0.560E+04 0.877E-02 0.535E-04

1143 3/26/1989 dry field runoff 0.387E+04 0.121E-01 0.736E-04

1144 3/29/1989 dry field runoff 0.449E+03 0.770E-01 0.505E-03

1145 5/ 1/1989 dry field runoff 0.346E+02 0.105E+00 0.815E-03

1146 5/31/1989 manual release 0.316E+05 0.169E+03 0.455E+01

1147 6/ 5/1989 dry field runoff 0.221E+04 0.316E+03 0.248E+00

1148 9/17/1989 dry field runoff 0.150E+05 0.659E+00 0.193E-02

1149 9/19/1989 dry field runoff 0.159E+04 0.524E+01 0.153E-01

1150 9/29/1989 dry field runoff 0.276E+04 0.212E+01 0.659E-02

1151 9/30/1989 dry field runoff 0.124E+04 0.411E+01 0.101E-01
68

1152 10/ 3/1989 dry field runoff 0.200E+04 0.241E+01 0.759E-02

1153 10/22/1989 dry field runoff 0.276E+03 0.648E+01 0.227E-01

1154 10/24/1989 dry field runoff 0.871E+04 0.286E+00 0.100E-02

1155 10/25/1989 dry field runoff 0.197E+04 0.111E+01 0.328E-02

1156 11/25/1989 dry field runoff 0.100E+04 0.947E+00 0.370E-02

1157 11/26/1989 dry field runoff 0.982E+04 0.103E+00 0.368E-03

1158 1/ 2/1990 dry field runoff 0.560E+04 0.955E-01 0.411E-03

1159 1/ 8/1990 dry field runoff 0.211E+04 0.221E+00 0.962E-03

1160 1/13/1990 dry field runoff 0.214E+05 0.212E-01 0.938E-04

1161 1/14/1990 dry field runoff 0.311E+04 0.133E+00 0.553E-03

1162 1/15/1990 dry field runoff 0.550E+04 0.742E-01 0.311E-03

1163 1/17/1990 dry field runoff 0.588E+03 0.559E+00 0.250E-02

1164 1/31/1990 dry field runoff 0.180E+04 0.167E+00 0.783E-03

1165 2/ 1/1990 dry field runoff 0.162E+04 0.174E+00 0.767E-03

1166 2/ 2/1990 dry field runoff 0.933E+03 0.276E+00 0.122E-02

1167 2/ 4/1990 dry field runoff 0.366E+04 0.762E-01 0.360E-03

1168 2/ 7/1990 dry field runoff 0.135E+04 0.182E+00 0.868E-03

1169 2/17/1990 dry field runoff 0.149E+05 0.152E-01 0.741E-04

1170 2/18/1990 dry field runoff 0.111E+04 0.173E+00 0.797E-03

1171 3/ 3/1990 dry field runoff 0.197E+04 0.841E-01 0.429E-03

1172 3/ 5/1990 dry field runoff 0.194E+04 0.813E-01 0.417E-03

1173 3/11/1990 dry field runoff 0.242E+04 0.585E-01 0.307E-03

1174 4/23/1990 dry field runoff 0.366E+04 0.150E-01 0.959E-04

1175 5/24/1990 dry field runoff 0.760E+03 0.106E+04 0.180E-03

1176 5/28/1990 overflow 0.259E+04 0.649E+02 0.659E+00

1177 5/31/1990 manual release 0.395E+05 0.131E+03 0.351E+01

1178 11/15/1990 dry field runoff 0.138E+03 0.316E+01 0.141E-01

1179 11/20/1990 dry field runoff 0.691E+02 0.366E+01 0.166E-01

1180 11/26/1990 dry field runoff 0.183E+04 0.342E+00 0.158E-02

1181 12/11/1990 dry field runoff 0.722E+04 0.679E-01 0.324E-03

1182 12/12/1990 dry field runoff 0.321E+04 0.141E+00 0.628E-03

1183 12/16/1990 dry field runoff 0.297E+04 0.143E+00 0.688E-03

Maximum released concentration = 0.355E+04 0.536E+01

Index for max released concen. = 371 958

With Index Reservoir

California, 1.46 lbs ai/A, 1 application to 4” depth paddy, dry application

Variable Volume Water Model, Version 0.0

*******************************************

Performed on: 1/17/2012 at 17:16

Standard Pond

Chemical # 1

Peak 1-in-10 = 3.23E+02 ppb

Chronic 1-in-10 = 8.13E+01 ppb

4-day avg 1-in-10 = 3.13E+02 ppb

21-day avg 1-in-10 = 2.79E+02 ppb

60-day avg 1-in-10 = 2.16E+02 ppb

90-day avg 1-in-10 = 2.16E+02 ppb

YEAR Peak 4-day 21-day 60-day 90-day Yearly Avg

 1 2.69E+02 2.61E+02 2.30E+02 1.72E+02 1.42E+02 6.04E+01

 2 2.87E+02 2.79E+02 2.47E+02 1.92E+02 1.62E+02 7.28E+01

 3 2.94E+02 2.85E+02 2.53E+02 1.97E+02 1.67E+02 7.52E+01

 4 2.94E+02 2.85E+02 2.70E+02 2.16E+02 1.82E+02 8.14E+01

 5 2.93E+02 2.84E+02 2.52E+02 1.98E+02 1.69E+02 7.78E+01
69

 6 2.91E+02 2.82E+02 2.49E+02 1.93E+02 1.62E+02 7.26E+01

 7 3.51E+02 3.40E+02 3.05E+02 2.39E+02 2.00E+02 8.55E+01

 8 2.93E+02 2.84E+02 2.50E+02 1.91E+02 1.60E+02 7.27E+01

 9 2.91E+02 2.82E+02 2.48E+02 1.92E+02 1.62E+02 7.07E+01

10 2.87E+02 2.78E+02 2.46E+02 1.88E+02 1.58E+02 7.01E+01

11 2.92E+02 2.83E+02 2.52E+02 1.96E+02 1.65E+02 7.31E+01

12 2.89E+02 2.80E+02 2.56E+02 2.00E+02 1.68E+02 7.66E+01

13 2.89E+02 2.79E+02 2.42E+02 1.83E+02 1.52E+02 6.81E+01

14 2.90E+02 2.82E+02 2.51E+02 2.08E+02 1.78E+02 8.16E+01

15 2.95E+02 2.85E+02 2.46E+02 1.86E+02 1.56E+02 6.71E+01

16 2.83E+02 2.73E+02 2.38E+02 1.81E+02 1.51E+02 6.67E+01

17 2.91E+02 2.83E+02 2.52E+02 1.95E+02 1.65E+02 7.42E+01

18 2.89E+02 2.80E+02 2.44E+02 1.88E+02 1.59E+02 7.13E+01

19 2.90E+02 2.81E+02 2.43E+02 1.86E+02 1.57E+02 6.98E+01

20 2.89E+02 2.81E+02 2.50E+02 2.03E+02 1.74E+02 8.02E+01

21 2.94E+02 2.85E+02 2.51E+02 1.90E+02 1.59E+02 7.07E+01

22 2.90E+02 2.81E+02 2.49E+02 1.97E+02 1.68E+02 7.97E+01

23 3.30E+02 3.20E+02 2.84E+02 2.20E+02 1.86E+02 8.03E+01

24 2.87E+02 2.77E+02 2.40E+02 1.82E+02 1.51E+02 6.50E+01

25 2.87E+02 2.78E+02 2.46E+02 1.86E+02 1.55E+02 6.92E+01

26 2.88E+02 2.79E+02 2.45E+02 1.87E+02 1.57E+02 7.07E+01

27 2.84E+02 2.75E+02 2.40E+02 1.85E+02 1.56E+02 6.96E+01

28 2.87E+02 2.78E+02 2.45E+02 1.86E+02 1.55E+02 6.66E+01

29 3.03E+02 2.93E+02 2.68E+02 2.09E+02 1.76E+02 7.96E+01

30 3.25E+02 3.16E+02 2.80E+02 2.16E+02 1.80E+02 8.02E+01

***********************************************************************

Effective compartment halflives averaged over simulation duration:

zero washout

water col metab halflife (days) = 80.31356 

hydrolysis halflife (days) = 1.0006600E+08

photolysis halflife (days) = 1.0025462E+10

volatile halflife (days) = 1.4586906E+11

total water col halflife (days) = 80.31351 

zero burial

benthic metab halflife (days) = 1588.424 

benthic hydrolysis halflife (days) = 3.3075661E+09

total benthic halflife (days) = 1588.423 

***********************************************************************

**************** Inputs *******************

Chemical # 1

 63.0000000000000 

Water Column System Halflife(except photo & hydrolysis = 

 1246.00000000000 Benthic Compartment Halflife (except hydrolysis) = 

 100000000.000000 Photolysis Halflife = 

 100000000.000000 Hydrolysis Halflife = 

 198.000000000000 Molecular Wieght = 

 7.499999999999999E-009 Vapor Pressure = 

 1370000.00000000 Solubility = 

 297.000000000000 Koc = 

 20.0000000000000 Aerobic Reference Temper = 

 20.0000000000000 Anaerobic Reference Temper = 

 40.0000000000000 Reference Latitude = 

 49884.0000000000 Enthalpy of Henry = 

 20.0000000000000 Henry Reference Temperature 

****************** End of Run ************************

******************************************************
70

***********************************************************************

Variable Volume Water Model, Version 0.0

*******************************************

Performed on: 1/17/2012 at 17:16

Standard Pond

Chemical # 2

Peak 1-in-10 = 2.84E+03 ppb

Chronic 1-in-10 = 2.82E+03 ppb

4-day avg 1-in-10 = 2.84E+03 ppb

21-day avg 1-in-10 = 2.84E+03 ppb

60-day avg 1-in-10 = 2.84E+03 ppb

90-day avg 1-in-10 = 2.84E+03 ppb

YEAR Peak 4-day 21-day 60-day 90-day Yearly Avg

 1 1.51E+02 1.51E+02 1.50E+02 1.48E+02 1.47E+02 1.20E+02

 2 3.08E+02 3.08E+02 3.07E+02 3.05E+02 3.04E+02 2.73E+02

 3 4.64E+02 4.64E+02 4.63E+02 4.61E+02 4.60E+02 4.30E+02

 4 6.30E+02 6.30E+02 6.30E+02 6.28E+02 6.27E+02 5.96E+02

 5 7.75E+02 7.75E+02 7.74E+02 7.73E+02 7.72E+02 7.45E+02

 6 9.11E+02 9.10E+02 9.10E+02 9.10E+02 9.09E+02 8.86E+02

 7 1.08E+03 1.08E+03 1.08E+03 1.08E+03 1.08E+03 1.05E+03

 8 1.20E+03 1.20E+03 1.20E+03 1.20E+03 1.20E+03 1.18E+03

 9 1.32E+03 1.32E+03 1.32E+03 1.32E+03 1.32E+03 1.30E+03

10 1.43E+03 1.43E+03 1.43E+03 1.43E+03 1.43E+03 1.42E+03

11 1.54E+03 1.54E+03 1.54E+03 1.54E+03 1.54E+03 1.53E+03

12 1.65E+03 1.65E+03 1.65E+03 1.65E+03 1.65E+03 1.64E+03

13 1.76E+03 1.76E+03 1.76E+03 1.76E+03 1.76E+03 1.74E+03

14 1.86E+03 1.86E+03 1.86E+03 1.86E+03 1.86E+03 1.85E+03

15 1.96E+03 1.96E+03 1.96E+03 1.96E+03 1.96E+03 1.95E+03

16 2.04E+03 2.04E+03 2.04E+03 2.04E+03 2.04E+03 2.03E+03

17 2.12E+03 2.12E+03 2.12E+03 2.12E+03 2.12E+03 2.11E+03

18 2.20E+03 2.20E+03 2.20E+03 2.20E+03 2.20E+03 2.19E+03

19 2.28E+03 2.28E+03 2.28E+03 2.28E+03 2.28E+03 2.27E+03

20 2.36E+03 2.36E+03 2.36E+03 2.36E+03 2.36E+03 2.34E+03

21 2.43E+03 2.43E+03 2.43E+03 2.43E+03 2.43E+03 2.42E+03

22 2.50E+03 2.50E+03 2.50E+03 2.50E+03 2.50E+03 2.49E+03

23 2.59E+03 2.59E+03 2.59E+03 2.59E+03 2.59E+03 2.57E+03

24 2.65E+03 2.65E+03 2.65E+03 2.65E+03 2.65E+03 2.63E+03

25 2.70E+03 2.70E+03 2.70E+03 2.70E+03 2.70E+03 2.68E+03

26 2.75E+03 2.75E+03 2.75E+03 2.75E+03 2.75E+03 2.74E+03

27 2.80E+03 2.80E+03 2.80E+03 2.80E+03 2.80E+03 2.78E+03

28 2.85E+03 2.85E+03 2.85E+03 2.84E+03 2.84E+03 2.83E+03

29 2.90E+03 2.90E+03 2.90E+03 2.90E+03 2.90E+03 2.89E+03

30 2.97E+03 2.97E+03 2.97E+03 2.97E+03 2.97E+03 2.93E+03

***********************************************************************

Effective compartment halflives averaged over simulation duration:

zero washout

water col metab halflife (days) = 4755.073 

hydrolysis halflife (days) = 1.0003169E+08

photolysis halflife (days) = 1.0022024E+10

volatile halflife (days) = 2.4617026E+07

total water col halflife (days) = 4753.927 

zero burial

benthic metab halflife (days) = 1.2748184E+08

benthic hydrolysis halflife (days) = 1.6659828E+09

total benthic halflife (days) = 1.1842027E+08
71

***********************************************************************

**************** Inputs *******************

Chemical # 2

 3730.00000000000 

Water Column System Halflife(except photo & hydrolysis = 

 100000000.000000 Benthic Compartment Halflife (except hydrolysis) = 

 100000000.000000 Photolysis Halflife = 

 100000000.000000 Hydrolysis Halflife = 

 152.090000000000 Molecular Wieght = 

 3.700000000000000E-005 Vapor Pressure = 

 1000000.00000000 Solubility = 

 145.000000000000 Koc = 

 20.0000000000000 Aerobic Reference Temper = 

 20.0000000000000 Anaerobic Reference Temper = 

 40.0000000000000 Reference Latitude = 

 49884.0000000000 Enthalpy of Henry = 

 20.0000000000000 Henry Reference Temperature 

 1.00000000000000 Aerobic Molar transformation Fraction, Deg #1

 0.000000000000000E+000 Benthic Molar transformation Fraction, Deg #1

 1.00000000000000 Dry Soil Molar transformation Fraction, Deg #1

 0.000000000000000E+000 Photo Molar transformation Fraction, Deg #1

 0.000000000000000E+000 Hydroly Molar transformation Fraction, Deg #1

****************** End of Run ************************

******************************************************

***********************************************************************

Variable Volume Water Model, Version 0.0

*******************************************

Performed on: 1/17/2012 at 17:16

Standard Reservoir

Chemical # 1

Peak 1-in-10 = 4.38E+01 ppb

Chronic 1-in-10 = 1.07E+01 ppb

4-day avg 1-in-10 = 4.24E+01 ppb

21-day avg 1-in-10 = 3.76E+01 ppb

60-day avg 1-in-10 = 3.00E+01 ppb

90-day avg 1-in-10 = 3.00E+01 ppb

YEAR Peak 4-day 21-day 60-day 90-day Yearly Avg

 1 3.75E+01 3.65E+01 3.26E+01 2.48E+01 2.05E+01 8.07E+00

 2 3.90E+01 3.80E+01 3.41E+01 2.67E+01 2.26E+01 8.46E+00

 3 3.88E+01 3.78E+01 3.38E+01 2.66E+01 2.25E+01 9.48E+00

 4 4.01E+01 3.90E+01 3.72E+01 3.01E+01 2.55E+01 1.07E+01

 5 3.99E+01 3.88E+01 3.47E+01 2.77E+01 2.36E+01 1.04E+01

 6 3.99E+01 3.88E+01 3.47E+01 2.71E+01 2.29E+01 9.23E+00

 7 4.74E+01 4.61E+01 4.16E+01 3.30E+01 2.77E+01 1.13E+01

 8 4.01E+01 3.90E+01 3.47E+01 2.68E+01 2.25E+01 9.55E+00

 9 3.94E+01 3.83E+01 3.40E+01 2.67E+01 2.25E+01 9.26E+00

10 3.93E+01 3.81E+01 3.40E+01 2.64E+01 2.22E+01 9.05E+00

11 3.97E+01 3.87E+01 3.48E+01 2.74E+01 2.30E+01 9.84E+00

12 3.98E+01 3.87E+01 3.58E+01 2.83E+01 2.39E+01 1.01E+01

13 3.90E+01 3.78E+01 3.32E+01 2.52E+01 2.11E+01 8.88E+00

14 3.98E+01 3.87E+01 3.49E+01 2.92E+01 2.51E+01 1.10E+01

15 4.03E+01 3.90E+01 3.41E+01 2.60E+01 2.18E+01 9.09E+00

16 3.91E+01 3.78E+01 3.34E+01 2.57E+01 2.15E+01 9.19E+00

17 4.02E+01 3.93E+01 3.53E+01 2.78E+01 2.35E+01 9.68E+00

18 3.89E+01 3.78E+01 3.34E+01 2.60E+01 2.19E+01 9.26E+00

19 3.95E+01 3.83E+01 3.36E+01 2.59E+01 2.20E+01 9.12E+00
72

20 3.94E+01 3.83E+01 3.45E+01 2.84E+01 2.44E+01 1.07E+01

21 4.01E+01 3.90E+01 3.46E+01 2.65E+01 2.22E+01 8.70E+00

22 3.86E+01 3.75E+01 3.35E+01 2.68E+01 2.29E+01 9.76E+00

23 4.43E+01 4.31E+01 3.85E+01 3.01E+01 2.55E+01 1.03E+01

24 3.91E+01 3.78E+01 3.32E+01 2.53E+01 2.11E+01 8.74E+00

25 3.96E+01 3.85E+01 3.44E+01 2.63E+01 2.20E+01 9.05E+00

26 3.89E+01 3.78E+01 3.34E+01 2.59E+01 2.17E+01 9.37E+00

27 3.90E+01 3.78E+01 3.34E+01 2.60E+01 2.21E+01 9.42E+00

28 3.95E+01 3.84E+01 3.41E+01 2.63E+01 2.19E+01 9.05E+00

29 4.20E+01 4.08E+01 3.76E+01 2.97E+01 2.50E+01 1.02E+01

30 4.40E+01 4.26E+01 3.74E+01 2.86E+01 2.39E+01 9.84E+00

***********************************************************************

Effective compartment halflives averaged over simulation duration:

washout halflife (days) = 645.3960 

water col metab halflife (days) = 80.31356 

hydrolysis halflife (days) = 1.0006600E+08

photolysis halflife (days) = 1.3684754E+10

volatile halflife (days) = 1.9911128E+11

total water col halflife (days) = 71.42529 

zero burial

benthic metab halflife (days) = 1588.424 

benthic hydrolysis halflife (days) = 3.3075661E+09

total benthic halflife (days) = 1588.423 

***********************************************************************

**************** Inputs *******************

Chemical # 1

 63.0000000000000 

Water Column System Halflife(except photo & hydrolysis = 

 1246.00000000000 Benthic Compartment Halflife (except hydrolysis) = 

 100000000.000000 Photolysis Halflife = 

 100000000.000000 Hydrolysis Halflife = 

 198.000000000000 Molecular Wieght = 

 7.499999999999999E-009 Vapor Pressure = 

 1370000.00000000 Solubility = 

 297.000000000000 Koc = 

 20.0000000000000 Aerobic Reference Temper = 

 20.0000000000000 Anaerobic Reference Temper = 

 40.0000000000000 Reference Latitude = 

 49884.0000000000 Enthalpy of Henry = 

 20.0000000000000 Henry Reference Temperature 

****************** End of Run ************************

******************************************************

***********************************************************************

Variable Volume Water Model, Version 0.0

*******************************************

Performed on: 1/17/2012 at 17:16

Standard Reservoir

Chemical # 2

Peak 1-in-10 = 1.05E+02 ppb

Chronic 1-in-10 = 9.80E+01 ppb

4-day avg 1-in-10 = 1.05E+02 ppb

21-day avg 1-in-10 = 1.04E+02 ppb

60-day avg 1-in-10 = 1.03E+02 ppb
73

90-day avg 1-in-10 = 1.03E+02 ppb

YEAR Peak 4-day 21-day 60-day 90-day Yearly Avg

 1 2.07E+01 2.07E+01 2.06E+01 2.03E+01 1.99E+01 1.47E+01

 2 3.23E+01 3.22E+01 3.19E+01 3.06E+01 2.93E+01 1.88E+01

 3 3.15E+01 3.14E+01 3.14E+01 3.10E+01 3.07E+01 2.58E+01

 4 4.81E+01 4.81E+01 4.80E+01 4.75E+01 4.73E+01 4.10E+01

 5 6.01E+01 6.00E+01 6.00E+01 5.98E+01 5.96E+01 5.57E+01

 6 7.76E+01 7.75E+01 7.73E+01 7.67E+01 7.60E+01 5.99E+01

 7 6.47E+01 6.46E+01 6.46E+01 6.45E+01 6.43E+01 5.85E+01

 8 7.92E+01 7.92E+01 7.91E+01 7.87E+01 7.85E+01 6.91E+01

 9 7.52E+01 7.52E+01 7.51E+01 7.50E+01 7.49E+01 6.71E+01

10 8.16E+01 8.15E+01 8.13E+01 8.08E+01 8.03E+01 6.77E+01

11 7.89E+01 7.89E+01 7.89E+01 7.87E+01 7.85E+01 7.47E+01

12 9.69E+01 9.69E+01 9.68E+01 9.65E+01 9.60E+01 8.26E+01

13 8.34E+01 8.33E+01 8.31E+01 8.26E+01 8.21E+01 7.58E+01

14 9.30E+01 9.30E+01 9.30E+01 9.29E+01 9.26E+01 8.70E+01

15 1.03E+02 1.03E+02 1.03E+02 1.03E+02 1.02E+02 9.92E+01

16 1.21E+02 1.21E+02 1.21E+02 1.21E+02 1.20E+02 1.17E+02

17 1.35E+02 1.35E+02 1.35E+02 1.35E+02 1.34E+02 1.11E+02

18 9.41E+01 9.41E+01 9.40E+01 9.36E+01 9.32E+01 8.44E+01

19 9.30E+01 9.29E+01 9.27E+01 9.21E+01 9.14E+01 8.15E+01

20 8.79E+01 8.79E+01 8.77E+01 8.74E+01 8.71E+01 8.00E+01

21 9.23E+01 9.22E+01 9.20E+01 9.15E+01 9.09E+01 6.73E+01

22 5.32E+01 5.31E+01 5.29E+01 5.23E+01 5.17E+01 4.18E+01

23 5.38E+01 5.37E+01 5.35E+01 5.29E+01 5.22E+01 4.52E+01

24 6.44E+01 6.44E+01 6.44E+01 6.43E+01 6.42E+01 6.10E+01

25 8.32E+01 8.32E+01 8.30E+01 8.26E+01 8.21E+01 6.84E+01

26 6.54E+01 6.54E+01 6.54E+01 6.53E+01 6.52E+01 6.05E+01

27 7.82E+01 7.81E+01 7.80E+01 7.76E+01 7.73E+01 7.33E+01

28 9.16E+01 9.16E+01 9.15E+01 9.12E+01 9.10E+01 8.70E+01

29 1.05E+02 1.05E+02 1.04E+02 1.03E+02 1.01E+02 8.48E+01

30 8.20E+01 8.20E+01 8.19E+01 8.17E+01 8.14E+01 7.34E+01

***********************************************************************

Effective compartment halflives averaged over simulation duration:

washout halflife (days) = 645.3960 

water col metab halflife (days) = 4755.073 

hydrolysis halflife (days) = 1.0003169E+08

photolysis halflife (days) = 1.3680061E+10

volatile halflife (days) = 3.3602244E+07

total water col halflife (days) = 568.2535 

zero burial

benthic metab halflife (days) = 1.2748184E+08

benthic hydrolysis halflife (days) = 1.6659828E+09

total benthic halflife (days) = 1.1842027E+08

***********************************************************************

**************** Inputs *******************

Chemical # 2

 3730.00000000000 

Water Column System Halflife(except photo & hydrolysis = 

 100000000.000000 Benthic Compartment Halflife (except hydrolysis) = 

 100000000.000000 Photolysis Halflife = 

 100000000.000000 Hydrolysis Halflife = 

 152.090000000000 Molecular Wieght = 

 3.700000000000000E-005 Vapor Pressure = 

 1000000.00000000 Solubility = 

 145.000000000000 Koc = 

 20.0000000000000 Aerobic Reference Temper = 
74

 20.0000000000000 Anaerobic Reference Temper = 

 40.0000000000000 Reference Latitude = 

 49884.0000000000 Enthalpy of Henry = 

 20.0000000000000 Henry Reference Temperature 

 1.00000000000000 Aerobic Molar transformation Fraction, Deg #1

 0.000000000000000E+000 Benthic Molar transformation Fraction, Deg #1

 1.00000000000000 Dry Soil Molar transformation Fraction, Deg #1

 0.000000000000000E+000 Photo Molar transformation Fraction, Deg #1

 0.000000000000000E+000 Hydroly Molar transformation Fraction, Deg #1

****************** End of Run ************************

******************************************************

***********************************************************************