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MEMORANDUM Page 2of6 No' <br /> Holly Trading <br /> Tracy,, CA 00 S I E G F R I E D <br /> CA <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 B 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, 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 /> Min. <br /> Working <br /> Min. Volume for 1 <br /> Calculated Tank Detention Detention Day <br /> Volume (CTC) County Time per Tank Volume Time based Retention <br /> Building min County Used (TV) on TV (gallons) <br /> Area ADF (gallons) (days) (gallons) da s ADF/0.70 <br /> 1 240 1,440 4.2 1,500 5 344 <br /> 2 240 1,440 4.2 1,500 5 344 <br /> 3 240 1,440 4.2 1,500 5 344 <br /> 4 240 1,440 4.2 1,500 5 344 <br /> Totals 960 5,760 6,000 <br /> IV. Filter Bed Calculations <br /> Traditional Leach line Requirements= (CTC+ADF) *Soil Factor <br /> _ (5,760 gallons+ 960 gallons) *0.25 <br /> = 1,680 ft <br /> SF at soil effluent=1,680 *4 (Soil Bed Factor) = 6,720 sq. ft. <br /> Due to high ground water elevations and limited space for a large leach field a filter bed will be deployed <br /> using the Soil Acceptance Rate as a basis for design: <br /> Stockton San Jose Sacramento Modesto <br /> 3428 Brookside Rd. 111 N. Market St.,#300 109 Scripps Drive 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 Sanitary Sewer Design Criteria Memo Rev 1.docx <br />