### 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:** Kathry

n 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 application s 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) evalu ated applications of glufosinate - ammonium to rice and reported acute and chronic estimated drinking water concentrations (EDWCs) of 831 and 615 μg/L, respectivel y. These EDWC s exceeded the chronic drinking water level of concern (75 μ g/L , revised in 2012 based on updated consumption data in the Dietary Exposure Evaluation Model ( DEEM ) to 9 7 μ g/L ) . Since the publishing of these EDWCs, Baye r Crop Science (BCS) has made revisions to the labels and OPP has reevaluated the residues of concern and updat ed modeling parameters in an effort to refine the potential exposure estimate s. In May 2 012 , BCS submitted proposed label revisions on the Liberty® 

### and Liberty® 

### 280 SLl abel s 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 2 012, OPP’s Health Effects Division’s ( HED ) Residues of Concern Knowledgebase Subcommittee (ROCKS ) met to re - ev aluate 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 i s retained as a degradate of concern . Additionall y, based on their different mode s of action, drinking water estimates for MPP and glufosinate - ammonium are derived separatel y (D 397644 , 03/29 /2012) . The revised Liberty® 

### 280 SLl abel 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 f ields with a 7 - day p ost application holding period for flood waters . This application may b e split into two applications of approximately 40 fl oz product/acre/season (0.7 2 lbs ai/acre/season) , applied with a 1 0 to 14 - day r etreatment interval (RTI), where the first application is made to a dry field and the second application to a flooded field . I f this is done, then l onger holding periods for the flood water are required : 55 - day s for 4 - inch paddy depths and 30 - day s for 8 - inch paddy depths . F or 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 p ost - application flood water holding period is required . I f the maximum single application rate of 0.8 8 lbs ai/acre is used, then the application must be made to dry f ields. I f 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 day s after the first application , then the applications may b e made to either dry

o r flooded fields . I f two flooded - field application s of 0.44 lbs ai/acre are made, then the paddy d epth must be at least 8 inches . I f the applications are to dry f ields , then the paddy depth must be at least 4 inches . A 7 - day p ost - application holding period of paddy water is required for both dry and flooded - field applications. Finally , f

or bur ndown applications the Liberty® 

### 280 SLl abel allows a maximum

### 3

single application rate of 36 fl oz product/acre (0.66 lbs ai/A) , with a 7 - day p ost - application holding period for flood waters . The application rates for the Liberty® 

### label are similar to those prescribed on the Liberty® 

### 280 SLl abel. F or 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 f ields with a 7 - day p ost application holding period . This application may b e 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 - day s for 4 - inch paddy d epths and 30 - day s for 8 - inch paddy depths . F or 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 p ost - application flood water holding period . I f the maximum single application rate of 0.89 lbs ai/acre is used, the application must be made to dry f ields. If the applications is split into two applications of 3 4 fl oz product (0.44 lbs ai/acre), with the second application made from 10 - 14 day s after the first application , the applications may b e made to dry

o r flooded fields. If two flooded - field applications of 0.44 lbs ai/acre are made, the paddy d epth must be at least 8 inches in depth; if dry a pplications are made, a minimum 4 - inch paddy depth is required. A 7 - day p ost - a pplication holding period of paddy water is required for dry and flooded - field applications. The Liberty® 

### label does not allow for b urndown 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 estim ated acute EDWCs for glufosinate - ammonium and MPP using the refined Tier I Rice Model and Pesticide Flooded Application Model ( PFAM ) without the index reservoir. S everal methods were employed to estimate chronic EDWCs. In the first method, the acute concentration s from PFAM without the index reservoir were allowed to degrade over a 365 - day p eriod , using the aerobic aquatic degradation half - lives, and the average concentration over th e one - ye ar period was calculated . Using this method, chronic values are approximately 76 % and 3% lower than the acute values for glufosinate - ammonium and MPP, respectivel y. In the second method, EFED e valuat ed monitoring data for other pesticides (molinate, thiobencarb, and fipronil ) used predominantly f or rice growing to assess trends in chronic and acute concentrations . Th e s e data indicat e d 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 a cute 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 . R eduction s in peak to annual average concentrations us ing PFAM with the index reservoir were in the range of 7 3 - 85% and 4 - 47 % for glufosinate - ammonium and MPP , respectivel y . 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, a s 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 d erived 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 1**  **1** . Its hould be noted that the highest modeled EDWCs , as reported in **Table 1**  , occurred in California. While rice is grown in California, the Liberty® 

### 280 SLand Li berty® 

### products are currently n ot 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 a pplication s cenarios . This is different than the trend of results from the refined Tier I anal ys is, 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 a pplications were signifi cantl y lower (approximately 8 2%) . For MPP, the PFAM concentrations for dry applications were significantly lower (approximately 9 9%), while reductions in the flooded applications were comparable to the dry g lufosinate - ammonium applications (approximately 82%) . It appears that f or glufosinate - ammonium and MPP during flooded applications, the majority o f the compound remains in the water column after application, resulting in higher concentrations than occur following dry a pplications. A comparison of the s e PFAM results to maximum water column concentrations reported in an aquatic field dissipation (AFD) study f or glufosinate ammonium, adjusted to a 4 - inch paddy depth, indicates that the PFAM concentrations were similar to those in the AFD study f or glufosi nate - ammonium (8 3 μ g/L versus 93 μ g/L for a dry

a pplication and 375 μ g/L versus 288 μ g/L for a flooded application of 0.44 lbs ai/A, twice ). For MPP, the concentrations were similar for the flooded application (40 μ g/L versus 42 μ g/L), but much lower for the dry applications (2.8 μ g/L versus 102 μ g/). **Table 1**  **. EDWCs for glufosinate**  **- ammonium use on rice**  **derived using PFAM (maximum**  **values appear in bold) Use rate, Number of apps, retreatm**  **ent interval, water holding period**  **, application tim** **ing Acute EDWC**  **( μg/L**  **) Annual Average EDWC**  **1 (**  **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 flooded2 390 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 day s, 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 flooded2 183 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 day s, floode d 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 Wate r Assessment**  Glufosinate - ammonium (CAS 77182 - 82 - 2) is an active ingredient in Li berty® 

### 280 SL (EPA Reg. No. 264 - 829) and Liberty® 

### (EPA Reg. No. 264 - 660) . Among their many u ses, b oth 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 geneticall y modified to be tolerant to glufosinate - ammonium , or post - emergent to rice that is geneticall y modified to be tolerant to glufosinate - ammonium . Ap revious refined Tier II drinking water assessment ( DP Barcode 381992 , October 20, 2010 ) evaluated applications of glufosinate ammonium to rice and reported acute and chronic estimated surface water concentrations o f 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

E xposure Evaluation Model (DEEM) to 97 μg/L ) . Inresponse to this drinking water assessment , Bayer Crop Science (BCS) submitted label revisions to the Liberty® 

### 280 SL and Liberty® 

### label s . BCS also provided information to update the organic - carbon normalized distribution coefficients (KOC 

### s) used in the previous assessment . OPP also rec onsidered 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)] in its assessment. B ased 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 assess ed separatel y ( 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 SLl abel 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 f ields with a 7 - day

p ost application holding period for flood waters. This application may b e split into two applications of approximately

4 0 fl oz product/acre/season (0.72 lbs ai/acre/season) , applied with a 10 to 14 - day r etreatment interval (RTI), where the first application is made to a dry field and the second application to a flooded field. I f this is done, then longer holding periods for the flood water are required: 55 - day s for 4 - inch paddy depths and 30 - day s for 8 - inch paddy depths . F or 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 p ost - application flood water holding period is required. I f the maximum single application rate of 0.8 8 lbs ai/acre is used, then the application must be made to dry f ields. I f 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 day s after the first application, then the applications may b e made to either dry

o r flooded fields. I f two flooded - field applications of 0.44 lbs ai/acre are made, then the paddy d epth must be at least 8 inches. I f the applications are to dry fields, then the paddy d epth must be at least 4 inches. A 7 - day p ost - application holding period of paddy water is required for both dry and flooded - field

### 6

applications. F inally , f

or burndown applications the Liberty® 

### 280 SLl abel allows a maximum single application rate of 36 fl oz product/acre (0.66 lbs ai/A) , with a 7 - day p ost - application holding period for flood waters . The application rates for the Liberty® 

### label are similar to those prescribed on the L iberty® 

### 280 SLl abel. F or 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 f ields with a 7 - day

p ost application holding period . This application may b e split into two applications of 56 fl oz produ ct/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 - day s for 4 - inch paddy depths and 30 - day s for 8 - inch paddy depths . F or 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 p ost - application flood water holding period . I f the maximum single application rate of 0.89 lbs ai/acre is used, the application must be made to dry f ields. If the applications is split into two applications of 3 4 fl oz product (0.44 lbs ai/acre), with the second application made from 10 - 14 day s after the first application , the applications may b e made to dry

o r flooded fields. I f two flooded - field applications of 0.44 lbs ai/acre are made, the paddy d epth must be at least 8 inches in depth; if dry a pplications are made, a minimum 4 - inch paddy depth is required . A7 - day p ost - application holding period of paddy water is required for dry and flooded - field applications. The Liberty® 

### label does not allow for b urndown applications for rice . **Table 2**  summarizes the uses on the proposed labels. **T able**  **2 . Labeled uses for glufosinate**  **- ammonium on rice**  **Use Maximum** 

**Application Rate (lbs**  **ai/acre) Number of** 

**Applications Minim**  **um**

**Retreatm ent**  **Interval Minim**  **um**

**paddy depth (inches)**  **Flooded or dry** 

**field Minim**  **um**

**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 G lufosinate tolerant 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 G lufosinate tolerant 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 Minim**  **um**

**Retreatm ent**  **Interval Minim**  **um**

**paddy depth (inches)**  **Flooded or dry** 

**field Minim**  **um**

**Water Holding**  **Period (days)**  Rice Seed 0.44 2 10 8 Flooded 7 

### G lufosinate - 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 u sage 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

l ink rice lines, LL62 ® 

### and LL06 ® 

### , have been released for planting . B ecause 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 e ngineered rice has not become economically p opular (Lemaux, date unknown) . As such, one could infer that if farmers are n o t growing gl ufosinate - tolerant rice, then use of glufosinate - ammonium on glufosinate - tolerant rice plants, or use for propagation of glufosinate - tolerant ri ce seed is also unlikel y . Data on the amount of use of glufosinate ammonium as a burndown treatment are not available. **3. Environmental Fate**  A complete summary

o f the environmental fate of glufosinate - ammonium may b e found in **Table 3**  . Glufosinate - ammonium is stable to hydroly sis and aqueous photoly sis, and degrades slowly i n anaerobic aquatic environments (half - life of 415 day s) (MRIDs 40345656, 41323115, 46258601). P rimary

routes of degradation for gl ufosinate - ammonium are soil photol ys is (halflife = 17 day s), aerobic soil metabolism (half - lives ranging from 8 .5 to 23 day s) and aerobic aquatic metabolism (half - lives ranging from 1 to 87 days) (MRIDs 41920102, 4 1323119 , 40345659A, 40345660 , and 45204402 /01 ). G lufosinate - ammonium is mo bile in sand (organic carbon - normalized soil partition coefficient, K oc 

### , = 16.5 L/kg oc 

### ) and moderatel y mobile in silt loam soils ( Koc 

### s of 268 and 605 L/kg oc 

### ) according to the FAO classification sy stem (FAO, 2000; MRID 40345662 /48394101 ). K oc 

### 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 approp riate for glufosinate - ammonium. Ins everal terrestrial field dissipation (TFD) studies , glufosinate - ammonium dissipate d from the upper six inche s of soil with half

- lives of 1 - 2 weeks (MRIDs 43110402, 43766915, 43766916 , 47542601 ). This range of dissipation rates is generall y 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 s oils or further than 24 inches in a sand soil. M ajor degradates ( e.g ., those that made up ≥10% applied parent equivalents) of glufosinate - ammonium include 3 - methylphosphinico - propionic acid (MPP, HOE 061517), 2 - me thylphosphinico - acetic acid (MPA, HOE 064619), and 2 - acetamido - 4 - methylphosphinico - butanoic acid (NAG, HOE 085355). Based on findings by H ED’s ROCKS, o nly 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 f looding and holding of the water for 60 day s. A dditionally , two applications of 0.45 lb ai/A of glufosinate - ammonium were made to a flood ed, 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 (typicall y 14 - 28 day s after planting) and the second application was made 14 day s later, corresponding to the 2 - to 3 - tiller stage. At both test sites, applications were made using broadcast ground equip ment. 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 a ddition of water as necessary t o 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 ) . M easured concentrations in these studies are expected to be lower than what would occur in water bodies with smaller depths . P lots were drained 60 day s after the second application in Lo uisiana and 90 day s after th e se cond application in California . At the Louisiana site, the maximum concentration of glufosinate - ammonium in the flood water w as 31 μg/L( Day

4 ). In California, the maximum concentration of glufosinate - ammonium in the flood water w as 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). B ased on comments f

rom the registrant (MRID 483941 01), the Koc 

### s previously u sed by EFED were based on organic matter and not organic carbon content. T he values used in this assessment and presented in **Tables 3**  and **4** have been corrected by t aking the previous values and multiplying by

1 .72 , an assumed, standard correc tion factor for organic matter to organic carbon conversion, as used in OPPTS Guideline 835.1230 . **Table 3**  **. Physical/chemical propertie s and environmental fate**  **da ta for glufosinate**  **** **ammonium .**  **Property Value**  **Source Comments**  **Chemical Name**  Ammonium - (2RS) - 2 - amino - 4 - (methylphosphinato)butyric acid **– –**  **Molecular Weight (g/m ol)**  198.2 **– –**  **Solubility in Water (m g/L, 20°C)**  1.37x10 6 MRID 00263025 **– Vapor Pressure (torr, 25°C)**  <7.5x10 - 9 MRID 44032901 **– Henry’s Law Constant**  **(atm -**  **m 3**  **/m ole)**  1.43 x 10 - 12

**–** Estimated using vapor pressure, mo lecular 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 4132311 9 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 Half****** **life (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**  **- Norm**  **alized Soil Partition Coefficient (mL/g**  **oc ) (Koc)**  16.5 (sand) 268 (silt loam) 605 (silt loam) MRID 40345662/ 48394101 1 **-- Terrestrial field dissipation half** **** **lives (days)** 8 (cropped plot) MRID 43110402

**–** 16.5 (cropped plot) 15.1 (bare ground) MRID 4376691 5 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 Koc s previously used by E FED we re based on organic matter and not organic carbon content . Th e values reported in this t able 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 EPI Suite, are provided in **Table 4**  . Based on aerobic soil metabolism studies for glufosinate ammonium (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 day s . D egradation in aerobic aquatic environments for MPP was estimated from a study submitted fo r glufosinate - ammonium (MRID 45204402/01) , indicating that MPP is persistent in water with a half

- life ranging from 441 to 2,054 day s . It should be noted that there is significant uncertainty surrounding the degradation of MPP in water, as the study w as n ot actually conducted by

a ppl yi ng MPP and the half - life developed for the sand sy stem applied with 1 ppm glufosinate - ammonium was based on four data points. M PP has roughly the same mobility a s glufosinate - ammonium , with a Koc 

### < 17 L/kg oc 

### in sand and Koc 

### s of 145 and 272 L/kg oc 

### in silt loam soils (MRID 40345662 /48394101 ). Li ke 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 (1 02 %). 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 soy beans, indicated MPP w as less mobile, restricted to the top 6 inches of the soil. Af ourth

### 10

TFD study

( MRID 47542601), where glufosinate - ammonium was applied to grapes, indicated MPP w as not detected below 18 inches. Estimated dissipation half - lives for MPP ranged from 33 to 169 day s 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 appl ied MPP , but with applied glufosinate - ammonium, some of which degraded to MPP . In the AFD study (MRID 45204403 ) conducted at the Lo uisiana 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 1 4 μg/L( Day 4 , 15% of maximum glufosinate - ammonium concentration) . If these concentrations were adjusted for a 4 - in ch paddy

d epth, the maximum MPP concentrations in the water would be 102 μg/L (LA) and 42 μg/L (CA). **Table 4**  **. Physical/chemical propertie s and environmental fate**  **data for MPP.**

**Property Value**  **Source Comments**  **Chemical Name** 3 - methylphosphinico -propionic acid **– –**  **Molecular Weight (g/m ol)**  152.09 **– –**  **Solubility in Water (m g/L,**  **20°C)** 1x10 6 EPISuite

**– Vapor Pressure (torr, 25°C)**  1.2 7 x10 - 5 EPISuite

**– Henry’s Law Constant**  **(atm -**  **m 3**  **/m ole)**  2.54 x 10 - 12

**–** Estimated using vapor pressure, molecular weight and solubility. **Aerobic Soil Metabolism Half** **** **life (days)** 6.5 ( sandy loam) MRID 4132311 8 0.5 ppm MPP 1 applied 18.6 (sandy loam) 1. 0 ppm MPP 1 applied 19.8 (sandy loam) 23.2 (silt loam) 21.1 (sandy loam) MRID 4132311 9 4 1.62 ppm GA 1 applied **Aerobic Aquatic Metabolism Half**  **- life (days)**  2,054 (sand) MRID 45204402/01 4 1 ppm GA 1 applied 441 (sand) 0.1 ppm GA 1 applied **Organic Carbon -**  **Norm alized**  **Soil Partition Coefficient (m**  **L/g oc** **) (Koc)** <17 (sand) 145 (silt loam) 272 (silt loam) MRID 40345662/ 48394101 2 **-- Terrestrial field dissipation**  **half -**  **lives ( days**  **)** 68 (cropped plot) MRID 43110402 4

**--** 169 (cropped plot) 95 (bare ground) MRID 4376691 5 4 33 (cropped plot) 67 (bare ground) MRID 43766916 4 34 (grapes) MRID 47542601 4 **Aquatic field dissipation half****** **lives (days)** 16 ( soil, 2nd application, LA) 3 9.4 ( water, 1st and 2nd applications, CA) MRID 45204403 4 **–** 1. MPP

– 3 - me thylphosphinico - propionic acid . GA

– glufosinate - ammonium . 2. Based on comments from the registrant (MRID 483941 - 01), the Koc s previously used by E FED we re based on organic matter and not organic carbon content . Th e values reported in this t able have been corrected by taking the old values and multiplying by 1.72. 3. I nsufficient data to estimate soil half - life after 1 st application. 4. Half - lives based on studies conducted using glufosinate ammonium.

### 11

**4. Relevant Rice Growing Practices**  Greater than 8 5 % 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 d ata from the National Agricultural Statistics Service (NASS) on rice acres planted in the United States for the ye ar 20 10 are provided in **Table 5**  .

**Table 5**  **. Summary of acres p lanted with**  **r ice in 20**  **10 1**  **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 . 

### Ing eneral, rice fields are prepared (disking and harrowing) prior to seeding in order to destroy w inter 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 ob tain a uniform seed germination and seedling emergence. In between planting and establishment of permanent flood ( 3 to 4 weeks after the seeding ) , fields may b e flushed several times to maintain moisture in the soil. Once the permanent flood is establishe d, it is maintained until 2 to 3 weeks before harvesting. F looded 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 i n continuously

f looded, flow through sy stems, where the rice is seeded by airplane into the water. H owever, the practice of dry s eeding of rice in California has increased due to weed resistance issues ( Hill et al. , 2006 ) . Weed control begins within day s of planting and continues until the canopy c loses over. Flooded paddies are normally

drained 2 - 3 weeks prior to harvest. Information from the University o f California Rice Research and In formation Program (http://www.plantsciences .ucdavis.edu/uccerice/rice_production/planting_water_mgmt.htm) states that paddy water depth s ty picall y 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. Indry seed planting, 4 - 6 weeks may elapse between planting and permanent flood establishment , although

1 Based o n 2007 census data from the Quick Stats Database of the National Agricultural Statistics Service available at http://quick stats.nass.usda.gov .

### 12

flooding fields immediately a fter seeding can improve weed control. A unif orm flood depth of less than four inches (1 - 2 inches is preferred) is usually m aintained prior to rice emergence, and then the flood depth is increased to four inches (Shipp, 2002) . Ty pical planting and harvesting periods were collected from the USDA ( 20 1 0 ) and are provided in **Table 6**  below. **Table 6**  **. Typical planting and h**  **arvesting d**  **ates** ***** **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 . Thes e 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 w ater 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 w aters , and is conservative when compared with surface water concentrations downstream of paddy discharges , monitoring data are no t available to support estimation of chronic exposure s . It is likel y that long - term mean concentrations that do not account for dilution will not be representative of chronic drinking water concentrations , because release of paddy w ater into surface water will not be continuous but instead will occur during specific times of the ye ar, such that water used as a so urce 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 r ate s of glufosinate - ammonium and MPP to the acute concentration , to account for degradation over a 365 - day p eriod , 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 t o rice , in order to estimate ty pical percent reduction s in going from acute to chronic concentrations ( **Section 5.3**  ). Lastly , an analy sis of Safe Drinking Water Informatio n Sy stem (SDWI S) data confirms that reservoirs and lakes in rice growing areas are commonl y used as community drinking water supplies (**Appendix A**  ). Thus the third technique investigates dilution as well as degradation of paddy e ffluent ( i.e. PFAM results ) that discharges into an index reservoir (the standard water body E FED 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 t o water. T he 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 00013

. 0 00105 . 0 ' 

###   and, if appropriate: Kd 

### = 0.01Koc 

### where C w 

### water concentration (μg/L) m ai 

### ’ 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 w ater in the vast majority o f 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 b e found on the U.S. Environmental Protection Agency (EPA) Water Models web - page (USEPA, 2007). Inthe 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. A dditionally, instead of considering one application, the equation was modifi ed 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: 

##    

t k M t M o 

### 

   exp 

### where M(t) mass in paddy per area of paddy

at time t (kg/ha) M o 

### in itial mass per area of paddy applied to paddy

(kg/ha) t time (day s) k aerobic soil or aquatic metabolism rate constant (day s - 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 t M t EEC d sed w 

### 

 where EEC(t) concentration in paddy water at time t (μg/L) CF 2 

### conversion factor (1x10 9 

### μg/kg / 1x10 4 

### m2 

### /ha / 1x10 3 

### L/m 3 

### = 100) dw 

### water column depth (0.1 016 and 0.2032 m in this assessment) d sed 

### sediment depth (0.01 m) θ sediment porosity (0.509 unitless) ρ sediment bulk density (1300 kg/m 3 

### ) Kd 

### water - sediment distribution coefficient (L/kg) CF 1 

### conversion factor (1000 L/m 3 

### ) Inthis 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 onl y modeled residues of concern and they w ere modeled separately . F or glufosinate - ammonium , a Koc 

### of 297 L/k g oc 

### was used in the modeling (average of the three reported values) . The 90 th 

### percentile upper confidence bound on the mean of six aerobic soil metabolism and five aquatic half - life rates for residues of glufosinate - ammonium ( 19 day s (k = 0.03 56 day s - 1 

### ) and 6 3 day s (k = 0.0 111 day s - 1 

### ) , respectivel y) w ere used in modeling . For MPP, a Koc 

### of 145 L/kg oc 

### was used in the modeling (average of the three reported values) . The 90 th 

### percentile upper confidence bound on the mean of five aerobic soil metabolism and two aquatic half

- life rates for residues of MPP ( 22 day s (k = 0.03 15 day s - 1 

### ) and 3,730 day s (k = 0.0 002 day s - 1 

### ), respectivel y) were used in modeling. For MPP, application rates were adjusted by

a factor of 0. 77 to account for differe nces in molecular weight (152/198 = 0.77 ). For Tier I modeling, the glufosinate - ammonium was assumed to instantaneously c onvert 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, b ut rather assumes it is present at day 1 . For all dry

a pplications, flooding occurred 24 hours after the last application. R elease of the permanent flood waters from the fields was assumed to begin 7 day s after the last application. F or flooded - field ap plications , release of the permanent flood waters from the fields was assumed to begin 7 day s after the last application. Results from the refined Tier I Rice Model are shown in **Table 7**  . For all applications , the acute concentration of glufosinate ammonium is slightly higher than those for MPP . Chronic values are approximately 7 6% and 3% lower than the acute values for glufosinate - ammonium and MPP, respectively .

### 15

**Table 7**  **. EDWCs using the r efined Tier I**  **rice m odel.**  **Use rate, Number of apps, retreatm ent interval, water holding**  **period 1**  **, 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, 1 st app dry and 2 nd app flooded NA 431 NA 105 0.73 lbs ai/acre, 2, 10 days, 55 days, 1 st app dry and 2 nd 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 day s, flooded4 NA 3 50 NA 94 MPP 5 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, 1 st app dry and 2 nd app flooded NA 510 NA 493 0.73 lbs ai/acre, 2, 10 days, 55 days, 1 st app dry and 2 nd 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 day s, 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 mo deled 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 Fl ooded Applications**  **Model (PFAM)** PFAM version 0.70 was developed as a flooded agriculture model for use in pesticide regulatory

w ork. This model has been developed under USEPA Guidance (USEPA , 200 9c ). External independent evaluations have been positive (Luo, 2011). As this model is under evaluation, it i s still considered provisional. PFAM is conceptualized in **Figure 1**  and includes both hydrological processes and chemical processes. The water body d epth may

c hange due to precipitation, refill, drainage, evaporation, and w eir - height changes. The model consists of two regions

—a water column and a benthic region. E ach individual region is completely m ixed and at equilibrium with all phases within the individual region, and equilibrium within each region follows a linear iso therm (USEPA, 2004 ) . The two regions are coupled by a f irst - order mass transfer process. Equations for c hemical processes ( i.e ., hydroly sis, bacterial metabolism, photoly sis, and sorption) within each region are similar to USEPA, 2004 . The model accounts for plant growth, metabolism, hydroly sis, photoly sis, an d metabolism in water, sediment, and soil (when no water is present), sorption, and volatiliz ation. W ater, sediment, and pesticide may flow out of the field. Changes in water body c onditions (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 - ye ar cycles for the length of the simulation. For instance, a ty pical exposure assessment assumes the pesticide i s used every

year for 30 ye ars (the length of most EFED meteorological files). Output is delivered as released mass of pesticide as well as a dail y time series of concentrations.

### 16

**Figure 1**  **. Conceptual model of**  **hydrological and chemical processes in PFAM**  **.** PFAM require s the entry o f s pecific 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**  w as used in the modeling to estimate emergence dates . Emergence generall y occurs 5 - 20 day s after planting (University o f Arkansas, 2006), so , for this assessment, e mergence dates were assumed to occur 1 0 day s 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 C rop tab. It was assumed that paddies are drained at least 21 day s prior to harvesting (Hill, et al. , 1997) . The Day s from Zero Height to Full Height were estimated as the difference between th e release date (harvest date minus 21 day s) and the emergence date. For single, dry applications, pesticides were applied one day p rior to flooding. F or burndown applications, pesticides were applied one day p rior to planting followed by f looding one day

l ater . F or dry , tolerant rice applications, the first application occurred 10 day s after planting ( assumed emergence period), with the second application occurring 10 day s later. F looding occurred one day a fter the second application. For the wet , tolerant rice applications ( 2 x 0.44 lbs ai/A) , flooding occur

r ed one day

p rior to planting, with applications beginning 10 day s after planting. For multiple applications for rice seed propagation ( 2 x 0.73 lbs ai/A), flooding occur r ed one day after planting, with the first application occurring 5 day s before planting (dry) and the second application occurring 5 day s after planting (wet) . F or all scenarios, t o 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 s peci fied as Event 2. F or dry a pplications, rele ase of the permanent flood waters from the fields was assumed to begin 7 day s after flooding . For flooded applications , release of the permanent flood waters from the fields was assumed to Di rect pes ti cid e appl ica tion tolitt oral region Vo la til izat ion Po te nt ia l O ve rflow

litto ra l region degradat ion

be nt hic region degradati on Li ttoral region

Bent hi c region li tto ral /b enthic mas s tra nsfe r De pth Ev ap oration Precipi tati on

Ad jus tab le Weir Pl ant Grow

th/S ha de

Wat erInput To leranc e

### 17

begin seven day s after the last application . A four - inch water column depth (0.10 16 m) and an eight - inch water column depth (0.20 32 m) w ere modeled at all sites to characterize the influen ce of water depth on the EDWC s . The remaining required i nput 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 C rop tab, except for the zero height reference which is the emergence date, an d the P hysical tab were left at the pre - determined, default levels (see **Appendix C**  ) . Inputs on the O utput tab include the area of application, the area of the surrounding watershed, and the curve number for the surrounding watershed. E FED recently updat ed the percent cropped area (PCA) estimates for use in drinking water assessments (USEPA, 2012) . U sing 8 - digit hydrologic units (HUC 8) and National Land Cover Data, EFED has developed a PCA of 20% for rice. U sing this PCA value times the area of the index res ervoir 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 w atershed (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 par ent and up to two degradates, glufosinate ammonium and MPP were modeled as a parent and degradate during the same PFAM runs . In PFAM , d egradates are handled exactl y 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 bio degradation, photoly sis or hydrol ys is. The stoichiometry o f the degradate production , supplied by the pesticide study submissions , i s also used as data input to the model . MPP parameters were entered on the D egradate 1 tab. **Table 8**  **. Crop -**  **specific dates u sed for**  **PFAM m odeling**  **(Crop tab)**

**State Planting**  **1 Emergence Date**  **2 Release Date**  **3 Harvesting**  **1** 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 T X April 9 April 19 July 31 August 21 MS May

2 May

12 August 30 September 20 1 Midpo int 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 p**  **rofiles Use rate, Number**  **of apps, retreatm**  **ent 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,**  **retreatm ent 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 2 7 - 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, 1 st app dry and 2 nd app flooded 1 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, 1 st app dry and 2 nd 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, flooded 3 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 2 9 - May 28 1. Applicable for a 4 - inch paddy depth . # days reflects 55 - day holding period after 2 nd application. 2. Applicable for an 8 - inch paddy depth . # days reflects 30 - day holding period after 2 nd application 3. Release modeled 7 days after 2 nd application . 

### Table **10 . PFAM inputs specific to g**  **lufos inate**  **- ammonium** **/MPP modeling r**  **uns Input Parameter**  **Value Source**  **Comment Chemical Tab**  Water Column Half

- life (days) at 20°C 63 MRIDs 40345660, 45204402/01 Represents the 90 th percentile upper c onfidence

bound on the mean ( 39 ) of 5 aerobic aquatic half - life values. 1 Benthic Compartment Half - Life (day s) 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 90 th percentile upper confidence

bound on the mean ( 15 ) of 6 aerobic soil halflife values . 1 Aqueous Near Surface Half - life (days) at 40° Latitude 1x10 8 MRID 41323115 No evidence of aqueous photolysis .

### 19

**Input Parameter Value**  **Source Comment**  Hydroly sis Half

- life (days) 1x10 8 MRID 40345656 No evidence of degradation. Organic Carbon Partition Coefficient (mL/g oc ) (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 . 37 x10 6 MRID 00263025 Heat of Henry (J/mol) 49884 --- Estimated using HENRYWIN program in EPISuite (see Appendix B ) . Henry Refer e nce Tem perature ( o C) 2 0 **Applications Tab** Number of Applications See Table 9 Application dates See Table 9 **Location Tab** Meteorological files AR (w 13963) LA (w 13970) CA (w23232) MS (w03940) TX (w 13958) --- Meteorological data available in PE5 installation. Stations correspond to Little Rock, AR (w 13963), Baton Rouge, LA (w 13970), Sacramento, CA (w23232), Jackson, MS (w03940), and Austin, TX (w 13958) **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 0.1016 2 0.2032 3 --- Crop profiles Weir Level (m) , Event 1 0.1270 2 0.2286 3 --- Assumed 1 inch clearance between top of weir and water. Min . Level (m), Event 1 0.1016 2 0.2032 3 --- 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. Day s 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**  Day s 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) 0.1270 2 0.2286 3 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 (m

2 ) 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 Hydroly sis 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 wa s 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 90 th percentile upper c onfidence

bound on the mean (1247 ) of 2 aerobic aquatic half - life values. 1 Benthic Compartment Half - Life (day s) at 20°C 1x10 8

--- Assumed stable. Unflooded Soil Half

- life (days) at 20°C 2 2 MRIDs 41323118, 40345659A Represents the 90 th percentile upper confidence

bound on the mean (18 ) of 5 aerobic soil halflife values. 1 Aqueous Near Surface Half - life (days) at 40° Latitude 1x10 8

--- Assumed stable. Hydroly sis Half

- life (days) 1x10 8

--- Assumed stable. Organic Carbon Partition Coefficient (mL/g oc ) (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) 1x10 6

--- EPISuite Heat of Henry (J/mol) 49884 --- Estimated using HENRYWIN program in EPISuite (see Appendix B) . Henry Reference Tem perature ( o C) 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 90 th 

### percentile peak (acute) and annual average (chronic) concentrations for the Arkansas, California, Lo uisiana, Mississippi, and Texas PFAM runs without the use of the index reservoir are provided in **Table 1**  **1** . The 90 th 

### percentile concentration was selected to reflect the 1 - in - 10 ye ar 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**  ) . M aximum concentrations for the effluent are estimated for each ye ar using concentration values designated as “overflow” or “manual release”. “ Dry f ield runoff” values are excluded from the anal ys is, 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 oc cur 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 t aking the upper 90 th 

### percentile concentration and allowing it to degrade in water for 365 day s using the aerobic aquatic metabolism half

- life of 63 and 3,730 day s for glufosinate - ammonium and MPP, respectivel y , and estimating the average daily c oncentration during the 365 day s . The values for a particular application, regardless of the site, are fairly c lose , a s the main difference s 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 glufosinate ammonium concentrations . For all sites and applications, chronic values are approximately 76% and 3% lower than the acute values for glufosinate - ammonium and MPP, respectivel y. The concentrations in the 8 - inch paddies are also roughly 50 % lower than those in the 4 - inch paddies , except for the scenario s with multiple applicatio ns for rice seed propagation, where concentrations in the 8 - inch paddies were 90% of the concentrations in 4 - inch paddies. **Table 11**  **. EDWC s u**  **sin g the PFAM**  **without -**  **the -**  **index -**  **r eservoir**  **. Use rate, n**  **umber of apps, retreatm**  **ent interval, water**  **holding period , application** 

**tim ing**  **Site Glufosinate**  **- am**  **monium MP**  **P 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 , dry 1 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 , dry 1 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, n umber of apps,**  **retreatm ent interval,**  **water holding period**  **, application**

**tim ing**  **Site Glufosinate**  **- am**  **monium MP**  **P 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 , dry 1 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, flooded 3 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 allow s for dry applied product to partition to water phase from sediment phase. T he field was flooded 24 - hours after the last application. 2 1 st application is made to dry soil, while the 2 nd 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 d epth. 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 s cenarios . This is different than the trend of results from the refined Tier I analy sis, where the highest single application rate (1.46 lbs ai/A) generated the highest acute EDWCs, with all other applications generating similar acute EDW Cs . This difference is due primarily to how each model treats mass transfer between the water column and the sediment. PFAM treats mass transfer a s a diffusion - driven, time - limited process , while the refined Tier 1 model assumes instantaneous equilibrium of chemical b e tw een 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 a pplications were significantl y lower (approximately 82 %) . For MPP, the PFAM concentrations for dry applications were significantly lower (approximately 9 9%), while reductions in the flooded applications were comparable to the dry g lufosinate - ammonium applications (approximately 82%) . It appears that f or glufosinate - ammonium and MPP during flooded applications, the majority o f 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 m atch the conditions under which the glufosinate ammonium AFD w as conducted, a comparison of the results from the two datasets for a 4 - inch paddy d epth indicates striking similarities. For glufosinate - ammonium, the PFAM concentrations were very s imilar to th ose from the AFD study ( 83 μ g/L versus 93 μ g/L for a Louisiana effluent (dry

a pplication) and 375 μ g/Lv ersus 288 μ g/L for a California effluent (flooded application) ). F or MPP, the concentrations were similar for the flooded application (40

### 23

μ g/L versus 42 μ g/L for a California effluent (flooded application)), but much lower for the dry applications (2.8 μ g/L versus 102 μ g/L for a Louisiana effluent (dry application) ) . **5.3. Monitoring Data**  **Glufosinate -** **ammonium and MPP** Glufosinate - ammonium is included as one of the anal yt es 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 recoverab le, filtered glufosinate (0.7 micron gl ass 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). S urface water and sediment monitoring data were not available for glufosinate ammonium from the California Department of Pesticide Regul ation’s (CDPR) database. It should be emphasized that these monitoring values are not directly c omparable 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 ye ar that paddy waters are discharged, modeled estimates are expected to be higher than non - targeted monitoring results. **Other Pesticides Use d 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

o f drinking water treatment plant intakes . Molinate is an herbicide that was exclusively

u sed on rice, so concentrations in surface water could be directly attributed to rice use. **Table 1**  **2** 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. S urface 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. F or West Sacramento, California, all of their w ater is obtained from the Sacramento River. T o adjust for the source of water, the maximum and annual concentrations for the City o f Sacramento were divided by the average percent of Sacramento River that Sacramento receives (71.4 % from 1991 - 2000), and multiplied by 1 00. Based on this data, time - weighted annual mean concentrations reported in the RED are approximately

8 0 - 88% lower than the maximum concentrations. However, molinate is more volatile than glufos inate - ammonium, so other active ingredients w ere also examined . Thiobencarb is another herbicide that has been used exclusively o n rice. L aboratory studies indicate thiobencarb is stable in aquatic environments . Thiobencarb i s moderatel y mobile to immobile and semivolatile. In aquatic field dissipation studies, thiobencarb dissipated relativel y quickl y in the water column, with DT 50 

### s less than 9 day s. G iven this information, the fate of thiobencarb appears similar to that of glufosinate - ammonium and its degradates. EFED examin ed the CDPR surface water database for thiobencarb data, particularly f or Colusa Basin

### 24

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

i s one of the top rice - producing counties in California, with many rice p addies 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 w ere obtained from the thiobencarb RED. Data were collected between the months of March and July each ye ar. Sampling intervals ranged from two to five day s, except for the time between the first and second sampling periods, which was between 22 and 35 day s. An anal ys is of the data ( **Table 1**  **3** ) 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 insecti cide used on rice. Fipronil is stable to hydrol ys is under mildly acidic to neutral pH conditions, but hydrol yz es under alkaline conditions . Field persistence of fipronil is low to moderate in water and soil (USEPA , 2001) . F ipronil monitoring data were available for 2000 and 2001 for parishes in Louisiana in the Mermentau River Basin (Appendix C, USEPA 2001) . Inr esponse to reports of low crawfish production in 1999 possibly d ue to the use of fipronil, a study

o f fipronil toxicity was conducted in the Mermentau River Basin. Eighteen stations throughout the rice belt were sampled weekly f rom March through August in 2000. In 2001, a follow up study

w as undertaken on eleven of the same stations. Weekly w ater co lumn samples were collected beginning in March and continu ed until no detects were observed at any o f the stations or August, whichever came first. Analy sis of the data ( **Table 1**  **4** ) 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 normall y 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 . Ba s ed 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 1**  **5** ). Glufosinate - ammonium and MPP results followed the same trends as discussed earlier in Section 5.2 . Glufosinate - ammonium c hronic 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 a cute**  **and chronic concentrations at surface water i ntakes**  **Location (Source of Data**  **2 )**  **Frequency of Detection**  **(Range of detection**  **limits) Molinate**  **Parent + degradates of concern 1** 

**Maximum Concentration**  **3 (μg/L)**  **Time**  

** weighted** **Annual Me**  **ans 3**  **(μg/L) %** 

**R eduction**  **6 Maximum** 

**Concentration 3**  **(μg/L) Time**  ****

**weighted Annual**  **Me ans**  **3 (μg/L)**  **%**

**R eduction**  **6** Sacramento, California ( Raw water from the Sacramento River after holding periods (1991 - 2000 data) ) 4 65/117 (0.1 μ g/L) 1.52 0.29 81 % 2.37 0.45 81 % West Sacramento, California ( Raw w ater 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 μ g/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

w ater from

1996 - 1999 USGS data in the Mississippi River at St. Francisville, LA) 13/58 (0.004 μ g/L) 0.117 0.014 88 % 0.18 0.022 88 % St. Mary Parish, Louisiana Intakes at Atchafalaya River ( Raw

w ater from 1996 - 1999 USGS data at Melville, LA) 15/57 (0.004 μ g/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 u pper 95th percentile of the annual maximum concentration values. Time - weighted annual means are the upper 95 th perce ntile of the annual means. In estimating annual means, n on - 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. App roximately 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 div ided 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**  **p eak**  **and t** **ime -** **weighted average seasonal c oncentrations for**  **t hiobe**  **n carb at Colusa Basin Drain #5**  **Year % NDs**  **Sampling Period**  **(days) Peak** 

**conc entration**  **( μ**  **g/L) TWA**  **Seasonal**

**Conc entration**  **( μ**  **g/L) %**  **R eduction**  1994 0% 63 37.4 2.75 93 % 1995 38% 97 3.67 0.93 7 5% 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**  **p eak**  **and t ime**  **- wei**  **ghted average s eason**  **a l c**  **oncentrations for f**  **ipronil in Louisiana 1**  **Parish Site ID**  **2000 2001**  **Max C onc**  **( μ**  **g/L) TWA** 

**Seasonal Conc**  **( μ**  **g/L) %** 

**R eduction**  **Max**

**C onc**  **( μ**  **g/L) TWA** 

**Seasonal Conc**  **( μ**  **g/L) %** 

**R eduction**  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 9 0 .5% -- -- -- Vermilion IX - 04 1.74 0.261 8 5.0% 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 8 0.0% 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. S tations 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 a**  **ssuming 50% r**  **eduction b**  **ase d on monitoring d**  **ata for other rice**  **p esticides**  **Use rate, n umber of apps,**  **retreatm ent interval, water**  **holding period , application** 

**tim ing**  **Site Glufosinate**  **- am**  **monium MP**  **P 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 , dry 1 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 , dry 1 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 , dry 1 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, flooded 3 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 allow s 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 2 nd 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 p rior 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 A pplications Model (PFAM) with**  **the Index Reservoir** PFAM estimates exposure in the rice paddy effluent , which is eventually mixed with surface water which potentially flow s to a drinking water intake. M ixing 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 especiall y 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 u sed by E FED 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 deriv ed estimates are provisional . The i nputs for this version of PFAM were the same as the previous inputs outlined in **Table 10**  . The 1 - in - 10 ye ar acute and 1 - in - 10 - ye ar chronic EDWCs from the Arkansas, California, Louisiana, Mississippi, and Texas scenarios are provided in **Table 1**  **6** . C ompared to the results depicted in **Table 1**  **1** , the addition of the index reservoir results in significant reductions in EDWCs for glufosinate - ammonium, but in some cases result s 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 pro duc ed the highest MPP EDWCs , presumably due to the lower rainfall in California compared with the other States. Because there is les s 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 anal ys is of the PFAM runs indicates it takes approximately 6 45 day s to flush the index reservoir in California, whereas in Texas it takes 171 days to flush the index reservoir and less than 105 day s for Arkansas, Louisiana, and Mississippi. This longer residence time , coupled with the persistence of MPP in aerobic aquatic environments, results in i ncreased concentrations for MPP , as MPP continues to accumulate in the California index reservoir from year to ye ar . Ing eneral, results generated using PFAM coupled with the index reservoir indicate 7 3 - 85 % and 4 - 47 % reduction s from peak to annual average concentrations for glufosinate - ammonium and MPP, respectively . R eductions in acute to chronic concentrations were 76% and 3% for glufosinate - ammonium and MPP , respectivel y, using PFAM without - the - index - reservoir , and a ccounting for aerobic aquatic degradation separatel y . 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 a**  **nalysis with the index r**  **eservoir Use rate, n**  **umber of apps, retreatm**  **ent interval, water holding period**  **, application**

**tim ing**  **Site Glufosinate**  **- am**  **monium MP**  **P 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 , dry 1 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, n umber of apps,**  **retreatm ent interval, water**  **holding period , application** 

**tim ing**  **Site Glufosinate**  **- am**  **monium MP**  **P 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 , dry 1 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 , dry 1 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 allow s 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. T he 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 intake s near rice production areas. E DWCs developed using these models may o verestimate 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 . Ac ommon 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) . S uch flushing would presumably a ct to partially remove glufosinate - ammonium and MPP from soil/sediment , such that concentrations in paddy water during the permanent flood would be lessen ed . Because the model runs done using PFAM do not account for this effect, model ed 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 w ater is rel eased seven to fifty- five day s 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 i n the aerobic aquatic environment), and thus lower release con centrations. In the PFAM modeling, upper 90 th 

### percentile confidence limits on mean half - li v e s for degradation in water and unflooded soil were used for glufosinate - ammonium , in accordance with EPA guidance. Use of these values may e xaggerate the stability

o f glufosinate - ammonium in these compartments, thereb y generating conservative EDWC estimates for glufosinate ammonium. H owever, 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 - model ed concentrations , EFED also examined use of the lower 90 th 

### percentile confidence limits on mean half - lives for glufosinate - ammonium in water (15 day s) and unflooded soil (11 days). R esulting MPP concentrations were 2.5 to 4 times greater under these assumptions . Environmental fate data for MPP were estimated from registrant - submitted studies , primaril y conducted using glufosinate - ammonium, and EPISuite. For d egradation in aerobic aquatic environments , MPP half - lives were estimated from a study s ubmitted for glufosinate ammonium (MRID 45204402/01) in two water - sediment sy stems, which indicat ed that MPP wa s persistent (half

- life ranging from 441 to 2,054 days ) . There is significant uncertainty about the se half - lives , because the study w as not conducted by

a ppl yi ng MPP as starting material, and because the half

- life developed for the sand sy stem with 1 ppm applied glufosinate - ammonium was based on onl y four data po ints. A dditionally , as data on MPP were not available for hydrol ys is, aqueous photolysis, and anaerobic aquatic metabolism, MPP was assumed to be stable via these routes of degradation. C ollectively , these assumptions generate little to no decrease from acute to chronic concentrations for MPP , and may o verstate the compound’s stability . Monitoring data from other pesticides were used to develop percent reduction values between peak and time - weighted average con c entrations in order to estimate chronic EDW Cs for glufosinate - ammonium and MPP . These pesticides have varying phy sical and chemical properties , which result in level s of persistence in the water column and soil that are likel y different than those for glufosinate - ammonium and MPP . A dditionally, the monitoring data were collected during the spring and summer months , and may n ot be representative of pesticides in final paddy release waters. Thus there is the possibility that use of th e 50% reduction factor could result in underestimation of chroni c concentrations of glufosinate ammonium and MPP . G iven 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 signific ant . The Liberty® 

### 280 SL and Liberty® 

### products are currentl y 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 SLand Liberty® 

### were registered in the s tate 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 w ater sy stems . R eservoirs are usuall y fed by multiple streams, wh ose flow is governed by l ocal precipitation , runoff and basefl ow . In some areas of the country the use of reservoirs for drinking water suppl y is not common , and in such cases water suppl y intakes may be locat ed 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 l arger 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 without the - 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; e valuating monitoring data for other pestic ides used predominatel y 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 7 6% and 3% lower than the acute EDWCs for gl ufosinate - ammonium and MPP, respectivel y. Monitoring data for other pesticides used predominately f or rice growing indicate that chronic EDWCs could be 50 to 90% lower than the acute EDWCs. Use of PFAM with the index reservoir estimate d acute and chronic concentrations in a receiving waterbody, indicating 73 - 85% and 4 - 4 7 % reduction from peak to annual average concentrations for glufosinate - ammonium and MPP, respectivel y . As the effluent concentrations derived us ing 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 degradation kinetics , as conservative estimate s for glufosinate - ammonium and MPP in drinking water . **Table 17**  **. EDWCs for glufosinate -**  **ammonium use on rice Use rate, Number of apps, retreatm**  **ent interval, water holding period**  **, application tim ing**  **Acute EDWC (**  **μg/L )**  **Annual Average EDWC**  **1 (**  **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 day s, 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, retreatm ent interval,**  **water holding period , application tim** **ing Acute EDWC**  **( μg/L**  **) Annual Average**  **EDWC 1**  **( 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 day s, 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 In formation 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., Di ckey, 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., & Gr eer, C. A. 2006. The California rice cropping sy stem: 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 Pest icide 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 Produ ction Handbook. Univer s i ty 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 Harevs ting Dates. United States Department of Agriculture, National Agricultural Statistics Service. October 29, 2010. http://usda.mannlib.cornell.edu/usda/current/planti ng/planting - 10 - 29 - 2010.pdf USEPA. 2001. T otal M aximum D aily L oad (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) , In cluding 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, Re gistration 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. Ecosy stems 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/oppe fed1/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. Pe sticide 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/anal ysis.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 , Offi ce 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 . Gui dance on the Development, Evalu ation, 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 Analy sis Division (BEAD) to EFED Regarding Liberty L ink 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.; Ey rich, U. (1986) Abiotic Hydrol ys is as a Function of pH and Amendment and Separation of Potential Hydrol ys is Products of HOE 039866 from the Active In gredient b y HP LC: 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. (198 7) 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 Gild emeister, H.; Jordan, H.; Schink, C. (1987) HOE 039866 - [carbon 14]: Aerobic Aquatic Metabolism Study : Project No. CB064/86. Unpublished study prepared b y Hoechst AG. 56 p. MRID: 40345662 Goerlitz, G. (1985) Adsorption/Desorption in the Sy stem -- 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 Phy sical Chemistry . 16 p.

### 35

MRID: 45204401 Stumpf, K. (1994) Aerobic Aquatic Metabolism of (carbon - 14) - Labelled Glufosinate - ammonium in Two Water Sediment Sy stems at Different Application Rates: 1st Amendment to Report CB90/109: L ab Project Number: CB90/109: CB90/109.A01: A53137. Unpublished study prepared b y Hoechst Schering AgrEvo GmbH. 60 p. MRID: 45204402 Stumpf, K. (1994) Aerobic Aquatic Metabolism of (carbon - 14) - Labelled Glufosinate - ammonium in Two Water Sediment Sy stems at Different Application Rates: L ab 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 L ouisiana 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 Metabol ism 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 - FA 6F - 3DE6 - A48F 98F1917AAEA8 ). The Safe Drinking Water Information Sy stem (SDWIS) maintained by the EPA (http://www.epa.gov/enviro/facts/sdwis/search.html ) was then used to find all drinking wat er 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 SDWI S sy stem an d finding information on the dri nking water sources on the internet . These results are shown in Table A1. **Table A1. Sources of Drinking Water for the Drin king 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/2007/11 2707_MRTP_Expansion.pdf Concow Reservoir THERMALITO WATER & SEWER DISTRICT http://www.buttecounty.net/~/medi a/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 CLAYTON SILVER CREEK GINS FRESNO 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 enthalp y of vaporization ( Schwarzenbach et al . , 2005), estimates of which can be obtained from EPI Suite among other sources. To estimate the enthalp y of vaporization using EPI Suite software , o pen the software, then select the HENRYWIN subprogram on the left of the EPISuite screen. On the top menu of the HENRYWI

N window item, select the ShowOptions, then select Show Temperature Variation with Results. Enter the chemical name of interest and then push the Calculate button. EPISuite will give the temperature variation results in the form of an equation: HLC (atm - m3/mole) = exp(A - (B/T)) {T in K}. The enthalp y of vaporization is B (in Kelvin). The enthalpy of solvation ( e.g. , heat of Henry in J oules/mol ) is calculated b y 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 multiplyin g the gas constant (8.314 J/mol - K) by th e compounds’ enthalpy of vaporization (6,000 K) estimated by Henry Win (v3.20). The printout s from Henry W in 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 | | 2.567 0

### 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 NH 2 (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 - 0 08 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 C O - 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. an d Imboden, D. M. (2005) Environmental Organic Chemistry , John Wiley

& Sons, Inc., Hoboken, NJ

### 47

**Appendix C. PFAM Default Values** The following default input parame ters were used in the PFAM anal ys is. These parameters are located on the Phys ical 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 dif ferences. 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 assumption s are that only aqueous phase 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 poro sity of the benthic compartment, or pore space volume per total volume . The d efault value is set to that used by the EPA standard farm pond , 0.50 . **Dry Bulk Density [g/cm 3**  

### ] is the rationally defined bulk density : [mass of sediment per total volume of sediment]. The d efault value is set to that used by the EPA s tandard farm pond , 1.35 g/cm 3



### . **Foc Water Column SS [unitless]**  is the fraction of organic carbon associated with suspended sediment. The d efault value is set to th at used by the EPA standard farm pond , 0.04 . **Foc Benthic [unitless]** is the fraction of organic carbon associated with benthic sediment. The d efault 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 d efault value is set to that used by the EPA standard f

arm pond , 30 mg/L . **Water Column DOC [mg/L]** represents the dissolved organic carbon concentration in the water column. The d efault value is set to that used by the EPA standard farm pond , 5.0 mg/L . This parameter onl y affects the photolysis rate. **C hloro**  **phyll, CHL [mg/L]**  represents the chlorophyll concentration in the water column. The d efault value is set to that used by the EPA standard farm pond , 0.005 mg/L . This parameter only affects the photoly sis rate.

### 48

**Dfac [unitless]** is a parameter used in the model EXAMS. It represents th e ratio of the optical path length to vertical depth. The d efault value is set to1.19 as s uggested by EXAMS documentation . **Q 10**  **[ unitless**  **]** is the Q10 value for metabolism. The default value is 2 , which is a ty pical value .

### 49

**Appendix D .**  **Example PFAM Outputs**  **Without Index Reservoir (pp1 file)** 90 th 

### 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 Wi dth in pop - up box and hit Next button. 7. Re mo ve extra delineations in Dr y 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 Wo rk sheet radio button and select as the Location “h2” 11. In Pivot Table Field List, drag Year to Row Labels, drag T yp e to Row L abels 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 T ype in the drop down list. Click on t he 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... me nu 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 90 th percentile (=Percentile(Range_of_data,0.9)) . 

### California, 1.46 lbs ai/A, 1 applic **ation 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 1/13/196 2 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 run off 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+0 4 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 1/29/196 3 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 run off 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+0 4 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 10/11/196 3 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 run off 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+0 3 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/ 1/196 4 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 run off 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+0 3 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 12/31/196 4 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 run off 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+0 4 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 11/15/196 5 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 run off 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+0 3 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 5/10/196 6 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 run off 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+0 4 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 3/11/196 7 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 run off 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+0 4 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 12/19/196 7 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 run off 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+0 4 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 10/31/196 8 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 run off 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+0 3 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 1/27/196 9 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 run off 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+0 4 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 12/20/196 9 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 run off 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+0 4 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/ 8/197 0 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 run off 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+0 4 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 12/19/197 0 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 run off 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+0 4 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 12/11/197 1 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 run off 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+0 4 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 9/28/197 2 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 run off 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+0 4 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 1/12/197 3 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 run off 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+0 4 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 3/31/197 3 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 run off 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+0 3 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/ 7/197 4 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 run off 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+0 4 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/ 1/197 4 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 run off 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+0 4 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 3/22/197 5 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 run off 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+0 3 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 11/14/197 6 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 run off 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+0 3 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 12/28/197 7 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 run off 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+0 5 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/ 9/197 8 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 run off 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+0 4 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 1/15/197 9 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 run off 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+0 4 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 11/26/197 9 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 run off 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+0 4 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 2/23/198 0 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 run off 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+0 3 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 1/30/198 1 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 run off 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+0 4 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 12/10/198 1 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 run off 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+0 4 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 3/27/198 2 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 run off 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+0 4 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/ 3/198 2 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 run off 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+0 4 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/ 3/198 3 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 run off 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+0 3 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 11/13/198 3 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 run off 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+0 3 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 3/17/198 4 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 run off 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+0 3 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 1/27/198 5 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 run off 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+0 4 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 12/29/198 5 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 run off 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 1 021 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+0 4 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 3/12/198 6 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 run off 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 1 049 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+0 3 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 2/15/198 7 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 run off 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 1 077 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+0 4 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/ 5/198 8 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 run off 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 1 105 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+0 5 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/ 1/198 9 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 run off 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 1 133 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+0 4 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 9/29/198 9 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 run off 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 1 161 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+0 4 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 11/15/199 0 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 

### W**ith 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 7.01 E+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 1.9 0E+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+0 2 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 h alflives 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 B enthic 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 2.2 0E+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+0 3 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 B enthic 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 tr ansformation 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 3.80 E+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 1.0 4E+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 2.8 3E+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+0 1 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 2 7 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) = 71.4 2529 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 He nry = 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 9.2 9E+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+0 1 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 2 9 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 averag ed 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 = 3.700000000000 000E - 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 trans formation Fraction, Deg #1 ****************** End of Run ************************ ******************************************************

***********************************************************************