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MEMORANDUM Page 3 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 /> <br />Table C: Septic Tank Volume <br />Building <br />Area ADF <br />Calculated Tank <br />Volume (CTC) County <br />min <br />(gallons) <br />Min. <br />Detention <br />Time per <br />County <br />(days) <br />Tank Volume <br />Used (TV) <br />(gallons) <br />Detention <br />Time based <br />on TV <br />(days) <br />Min. <br />Working <br />Volume for 1 <br />Day <br />Retention <br />(gallons) <br />[ADF/0.70] <br />1 2,100 2,700 2.3 4,000 3 3,000 <br />2 350 1,550 2.3 4,000 3 500 <br />3 2,100 2,700 2.3 4,000 3 3,000 <br />4 350 1,550 2.3 4,000 3 500 <br /> <br />IV. Filter Bed Calculations <br />Traditional Leach line Requirements = (CTC+ADF) * Soil Factor <br /> <br />= (4,800 gallons + 4,900 gallons) * 0.25 <br />= 2,425 ft <br />SF at soil effluent =2,425 * 4 (Soil Bed Factor) = 9,700 sq. ft. <br /> <br />Due to high ground water elevations a filter bed will be deployed using the Soil Acceptance Rate as a basis <br />for design: <br /> <br />Soil Acceptance Rate (Chesney 2019) = 0.311 gal/sqft/day (see Appendix A, page 9) = 0.311 gal/sqft/day <br /> <br />Maximum ADF for Soil Acceptance Rate = 0.311 gal/sqft/day * 15,756 sqft = 4,900 gal/day <br /> <br />Actual square footage within the Infiltrator chambers: <br /> <br />Total SF= 70 ft/leach line * 12 ft/leach line * 10 leach lines = 8,400 sqft <br /> <br />Total SF= 48 ft/leach line * 12 ft/leach line * 13 leach lines = 7,488 sqft <br /> <br />V. Design and Operational Specifications for Dosing/Surge Tank <br />and the Filter Beds: <br />Pump: Zoller 163 1/2hp with 2” FM. <br /> <br />Discharge Assembly: The 2” discharge pipe from the dosing tank will be connected to a 4” PVC tight <br />line by a 2X4 reducer – this will reduce the energy by decreasing the velocity in the pipe. This 4” <br />PVC tight line will be a minimum of 30 linear feet long before discharging into the distribution box. <br />The distribution box is designed with a 2” drop at the entrance. <br /> <br />There will be a total of twenty-two (22) outflow pipes connected to two distribution boxes. Each <br />distribution box will have eleven (11) outflow pipes connected to it. All pipes will be 4” PVC tight lines <br />and range in length, with the minimum length being 2 linear feet. At the transition to the perforated <br />lines, the pipes will drop 2” to the edge of the leach field. At the edge of the leach field, the 4” PVC