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MEMORANDUM Page 2of9 <br /> ■ <br /> Buildings H&I <br /> Tracy, CA S I E G F R I E D <br /> Daily Use Rate = Gallons of wastewater per day generated per employee <br /> Shift Number of GPD ADF (gallons/day) <br /> Employees <br /> 1 50 8.75 438 <br /> 2 50 8.75 438 <br /> 3 25 8.75 219 <br /> Totals 150 1,095 <br /> III. Septic Tank Volume <br /> Septic Tank Volume (CTC) Using the County Disposal Systems Equation 4.1.12 for determining volume of <br /> septic tanks: <br /> For ADF<1,500 Gallons/Day, CTC = 1,200 gallons (Base Tank Capacity) +ADF <br /> For ADF>1,500 Gallons/Day, CTC = 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 /> 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 /> For Sump Nos. 1 and 2, a traditional septic tank is proposed with a separate lift station to lift the liquid into <br /> the leach field. The proposed septic tank is specified as the smallest standard septic tank that meets the <br /> required minimum tank volume as calculated by the County with a factor of safety of 1.25 applied. <br /> Detention time is then recalculated for the actual septic tank size specified. <br /> Min. <br /> Working <br /> Min. Volume for 1 <br /> Calculated Tank Detention Detention Day <br /> Capacity (CTC) County Time per Tank Volume Time based Retention <br /> min County Used (TV) on TV (gallons) <br /> Building ADF (gallons) (days) (gallons) da s [ADF/0.70] <br /> H 1,095 2,295 1.3 4,000 2.5 1,565 <br /> 1 1,095 2,295 1.3 4,000 2.5 1,565 <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 /> F:\17projects\17017 Holly Sugar Industrial\Civil\Septic Sizing-Prelim\17017 H&I Sanitary Sewer Design Criteria Memo.docx <br />