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Wastewater Treatment System `'� +,��. FALL CREEK <br /> Engineering Report ENGINEERING,INC. <br /> 4. DESIGN CRITERIA AND CALCULATIONS— 10-YEAR PLAN <br /> The calculations performed in Section 3 were repeated to determine if the treatment system was <br /> sized adequately to process the increased crush flows projected under the 10-year plan. The <br /> wetland has been designed to remove biochemical oxygen demand (BOD) in the Winery's <br /> process wastewater by at least 95% based on design flows of 3,940 gallons per day, organic <br /> %W process <br /> of 164 lbs/day, and a surface loading rate of 745 lbs BOD/ac-day. The system will <br /> %W remain unchanged from its configuration in the current flow regime. <br /> \r <br /> All of the water balance and surface loading rate calculations described in Section 3 were <br /> Performed again to analyze the system under the projected 10- ear flows. Nothing changed in <br /> �► the calculations except the flow rates of both the process water and the stormwater. FCE <br /> performed this second set of water balance and surface loading rate calculations to assess the <br /> performance of the waland treatment system under future flow conditions. <br /> 4.1. Septic Tank <br /> The 5,000-gallon installed previously, will be used in the 10-year plan to settle screened <br /> wastewater. Table 4.1 shows the expected detention times in the septic tank for projected <br /> �' monthly flows under the 10-year plan. During the months of crush (August through November) <br /> %W detention times range from 1.5 to 3 days. In the summer months, detention time is longer <br /> because little process and storm water enter the system. Occasionally during the winter <br /> detention time could be as little as one and a half day due to stormwater entering the system. <br /> Table 4.1 Septic Tank Detention Times <br /> Septic Detention <br /> Month Inflow Time <br /> (gpd) day <br /> January 3,844 1.8 <br /> February 4,433 1.6 <br /> tom, March 3,255 2.2 <br /> ` April 1,795 3.9 <br /> May 1,007 7.0 <br /> .- June 494 14.2 <br /> _ July 429 16.3 <br /> August 2,375 2.9 <br /> �- September 4,212 1.7 <br /> _ October 4,456 1.6 <br /> November 3,625 1.9 <br /> December 4.160 1.7 <br /> 4.2. Water Balance Calculations <br /> Average and wet rainfall years were modeled to assess the capacity of the proposed wetland/land <br /> %W disposal system to manage wastewater and stormwater discharged from the winery utilizing <br /> calculated wastewater flow data. <br /> JESSIE'S GROVE WINERY MAY 2002 <br /> 16 <br /> L <br />