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Wastewater Treatment System
<br /> FALL CREEK
<br /> Engineering Report ENGINEERING,INC.
<br /> low Table 2.3. Daily and Monthly Process Wastewater Flow Variation-
<br /> Current and Future Production Levels
<br /> 1r.
<br /> 1rr Current Ex ansion Ten Year Plan
<br /> Process Total Process Total Percent of
<br /> Average Daily Monthly Average Daily Monthly Annual
<br /> 1r Flow(gpd) Flow(gal) Flow(gpd) Flow (gal) Use
<br /> January 66 2,055 158 4,891 1%
<br /> February 249 6,962 592 16,565 3%
<br /> March 249 7,707 592 18,340 4%
<br /> April 249 7,459 592 17,748 4%
<br /> May 166 5,138 394 12,226 3%
<br /> June 166 4,973 394 11,832 2%
<br /> `r July 166 5,138 394 12,226 3%
<br /> ` August 995 30,830 2,366 73,358 15%
<br /> September 1,658 49,725 3,944 118,320 24%
<br /> ` October 1,409 43,675 3,352 103,924 21%
<br /> VhW November 663 19,890 1,578 47,328 10%
<br /> December 663 20,553 1,578 48,906 10%
<br /> Total 204,105 Total 485,664 100%
<br /> %W 2.2.3. Stormwater and Combined Flows
<br /> The wastewater drains at Jessie's Grove Winery are not covered therefore both process
<br /> wastewater and stormwater enter the wastewater system. Winery stormwater runoff were used in
<br /> addition to process water values when designing the treatment system for the facility. FCE
<br /> estimated stormwater runoff from the facility in order to determine the combined flow estimate
<br /> .. (stormwater and process wastewater).
<br /> To estimate stormwater runoff, FCE delineated the drainage area of the Winery including the
<br /> Winery work sites and driveways. It was assumed that the surrounding horse corrals, pasture,
<br /> orchard and garden, Oak Grove, and lawns would not contribute any significant amount of
<br /> stormwater. The winery area (currently 52,000 sf) had an average impervious coefficient (C) of
<br /> 0.88. In the 10-year plan the Winery plans to increase the number of fermentors, which will
<br /> increase the facility area to approximately 56,000 sf.
<br /> FCE compiled monthly rainfall data from the California Department of Water Resource's Data
<br /> i Exchange Center(CDEC) for the closest station, in Stockton, California. Runoff in gallons was
<br /> ., calculated using the following equation:
<br /> Vs = 1'-2 *7.481*C*r(in)*A(sf)
<br /> ' where Vs is the monthly volume of runoff in gallons, C is the runoff coefficient of the Winery
<br /> facility, r is monthly rainfall in inches, and A is the area of the Winery facility in square feet.
<br /> To calculate rainfall statistics for average and high rainfall years, FCE compiled monthly total
<br /> rainfall data from water year 1978 through water year 2001. Using this data set, FCE calculated
<br /> the average monthly rainfall (17.9 in/yr) and estimated an above average rainfall by using a
<br /> JESSIE'S GROVE WRJERY MAY 2002
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