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MEMORANDUM Page 2 of 9 <br />Holly E&E Trading <br />Tracy, CA <br /> <br />Stockton San Jose Sacramento Modesto <br />3428 Brookside Rd. 111 N. Market St., #300 900 Howe Ave, #200 100 Sycamore Ave, #100 <br />Stockton, CA 95219 San Jose, CA 95113 Sacramento, CA 95825 Modesto, CA 95354 <br />t: 209.943.2021 t: 408.754.2021 t: 916.520.2777 t: 209.762.3580 <br /> <br />F:\17projects\17017 Holly Sugar Industrial\Civil\Septic Sizing - Prelim\17017 E&E Sanitary Sewer Design Criteria Memo Ver 4.docx <br />Daily Use Rate = Gallons of wastewater per day generated per employee <br /> <br /> <br /> Table A: Available Capacity (gpd) <br />Shift Number of <br />Employees <br />GPD ADF (gallons/day) <br />1 300 7.0 2,100 <br />2 300 7.0 2,100 <br />3 100 7.0 700 <br />Totals 700 4,900 <br /> <br />Our office accepts the flows as follows: <br /> Table B: Average Daily Flow <br />Building <br />Area <br />Description Number of <br />Employees <br />GPD ADF (gallons/day) <br />1 NW Office 300 7.0 2,100 <br />2 NE Office 50 7.0 350 <br />3 SW Office 300 7.0 2,100 <br />4 SE Office 50 7.0 350 <br />Totals 700 4,900 <br /> <br />III. Septic Tank Volume <br />Septic Tank Volume (TV) Using the County Disposal Systems Equation 4.1.12 for determining volume of <br />septic tanks: <br />For ADF<1,500 Gallons/Day, TV = 1,200 gallons (Base Tank Capacity) + ADF <br />For ADF>1,500 Gallons/Day, TV = 1,125 gallons + 0.75 ADF <br />For each sump, the minimum allowable septic tank size as determined by the County Disposal Systems <br />Equation is reported in Table C below. The minimum County Tank Volume is then used to calculate the <br />detention time as calculated by the following equation: <br /> <br />Detention Time (days) = Tank Volume*.70 (Reduced Volume due to sludge)/ADF <br />Note our office uses a reduction of 30% of tank volume which is lost over time due to sludge. <br /> <br />For Sump Nos. 1, 2, and 3, a traditional septic tank is proposed with a separate lift station to lift the liquid <br />into the leach field. The proposed septic tank is specified as the smallest standard septic tank that meets <br />the required minimum tank volume as calculated by the County. Detention time is then recalculated for <br />the actual septic tank size specified. <br />