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MEMORANDUM <br />Holly E&E Trading <br />Tracy, CA <br />III. Septic Tank Volume <br />Page 2 of 6 ■ o <br />00 SIEGFRIED <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 />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 <br />San Jose <br />Sacramento <br />Modesto <br />3428 Brookside Rd. <br />111 N. Market St., #300 <br />Min. <br />100 Sycamore Ave, #100 <br />Stockton, CA 95219 <br />San Jose, CA 95113 <br />Sacramento, CA 95825 <br />Modesto, CA 95354 <br />Working <br />t: 408.754.2021 <br />t: 916.520.2777 <br />Min. <br />Volume for 1 <br />Calculated Tank <br />Detention <br />Detention <br />Day <br />Volume (CTC) County <br />Time per <br />Tank Volume <br />Time based <br />Retention <br />Building <br />min <br />County <br />Used (TV) <br />on TV <br />(gallons) <br />Area ADF(gallons) <br />(days) <br />(gallons) <br />da s <br />ADF/0.70 <br />1 240 <br />1,440 <br />4.2 <br />1,500 <br />5 <br />344 <br />2 240 <br />1,440 <br />4.2 <br />1,500 <br />5 <br />344 <br />3 240 <br />1,440 <br />4.2 <br />1,500 <br />5 <br />344 <br />4 240 <br />1,440 <br />4.2 <br />1,500 <br />5 <br />344 <br />Totals 960 <br />5,760 <br />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 <br />San Jose <br />Sacramento <br />Modesto <br />3428 Brookside Rd. <br />111 N. Market St., #300 <br />109 Scripps Drive <br />100 Sycamore Ave, #100 <br />Stockton, CA 95219 <br />San Jose, CA 95113 <br />Sacramento, CA 95825 <br />Modesto, CA 95354 <br />t: 209.943.2021 <br />t: 408.754.2021 <br />t: 916.520.2777 <br />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 />