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♦. <br /> FALL CREEK <br /> REPORT OF WASTE DISCHARGE ENGINEERING_INC. <br /> low Rainfall(Rd. Rainfall is the depth of the direct monthly rainfall on the wetland, field, or storm <br /> ,.. water detention area. It is calculated by multiplying the monthly rainfall in inches (rt) by the area <br /> of the element(A) as given by the following equation. The storm water detention area, wetland, <br /> and field areas were assumed to have average areas of approximately, 9,800, 26,400, and 4,500 <br /> square feet, respectively. <br /> Sat _ l * tnches * <br /> `- Rt(month) 12 7'481*rt(month) A(sf) <br /> Infiltration (Id. Monthly infiltration of water into the soil beneath the grass field and the storm <br /> water detention area is a means of water outflow from the system(the wetland is assumed to be <br /> %' lined with no infiltration). Water applied in excess of the available water capacity of the soil will <br /> `. percolate beyond the root zone in the grass field and the grass-bottomed storm water detention <br /> area and enter the underlying groundwater. Soil at the site has been described by the Winery as a <br /> sandy loam. This soil type is generally assumed to have moderately rapid permeability and has <br /> clear water infiltration rates of 2.0 to 8.0 inches per hour(WEF, 1990). <br /> �k. <br /> ,%W The design infiltration rate is assumed to be much less than the clear water infiltration rate <br /> because of the gradual plugging of the soils. The design infiltration rate was estimated to be just <br /> 2% of the clear water infiltration rate(conservatively considered 2.0 in/hr). Average soil <br /> %' infiltration rate (i)was estimated at 1.0 inches per day(30 in/month). <br /> Sat _ 1 k sic Inches * * days <br /> I t(month) 12 7.481 I( day ) fI(Sf) d(month) <br /> Evapo-transpiration and Evaporation (Ed. Evapo-transpiration rate coefficients for the grass <br /> field was found in the University of California Reference Evapo-transpiration Bulletin. It was <br /> %W assumed that the evapo-transpiration of the wetland would be the same as the grass field. <br /> `o Evaporation from water surfaces on the storm water detention area was found in the University <br /> ` of California Evaporation from Water Surfaces in California reference bulletin. Monthly evapo- <br /> transpiration rates for both of these are presented Table 4.1. <br /> `. Table 4.1. Monthly Evapo-transpiration/Evaporation Rates(in/month) <br /> JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC <br /> Water Surface 1.10 1.93 3.86 6.02 8.82 8.90 11.34 9.72 7.28 4.41 1.93 1.06 <br /> Grass 0.91 1.43 2.78 4.24 5.88 6.95 7.05 6.17 4.62 2.91 1 1.49 1 0.76 <br /> %W <br /> `' Evapo-transpiration rates were multiplied by disposal surface area to estimate the monthly <br /> volume of water evaporated as follows. <br /> `. E ( sal ) =i*7.481*e (inches)*A(sJ )*d( days ) <br /> %V1 month month 12 t day month <br /> Process Wastewater(Pd. The current monthly process water was estimated as described in <br /> %W Section 3.1. Process water is given in gallons per month. <br /> Storm Water(Sd. Storm water was estimated for average and 100-year annual rainfall years as <br /> described in Section 3.1. Storm water is given in gallons per month. <br /> JESSIE'S GROVE WINERY 15 FEBRUARY 2004 <br />