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MEMORANDUM Page 3 of 9 ■ Buildings H&I Tracy, CA S I E G F R I E D IV. Filter Bed Calculations Traditional Leach line Requirements = (BTC+ADF) * Soil Factor = (1,200 gallons + 1,095 gallons) * 0.25 (Silty Clay) = 574 ft Minimum sf at soil effluent =574 * 4 (Soil Bed Factor) = 2,296sf< 3,500sf Due to high ground water elevations a filter bed will be deployed using the Soil Acceptance Rate as a basis for design: Based upon percolation test location PT-3 of the percolation summary report prepared by CTS dated October 18, 2021, an average percolation rate of 40min/in will be used, and per the OWTS Policy of the SWRCB, Table 3, the soil acceptance rate is 0.422 gal/sf/day. Furthermore, a factor of safety of 1.25 will be utilized resulting in a soil acceptance rate of 0.337 gal/sf/day. Maximum ADF for Soil Acceptance Rate = 0.377 gal/sf/day* 3,500 sf= 1,181 gal/day Actual square footage: Total sf= 70 ft/leach line * 10 ft/leach line * 5 leach lines = 3,500 sf V. Design and Operational Specifications for Pump Stations and the Filter Beds: Pump: Zoller 163 1/2hp with 2" FM. Discharge Assembly:The 2"discharge pipe from the dosing tank will be connected to a 4" PVC tight line by a 2X4 reducer— this will reduce the energy by decreasing the velocity in the pipe. This 4" PVC tight line will be a minimum of 30 linear feet long before discharging into the distribution box. The distribution box is designed with a 2" drop at the entrance. There will be a total of five (5) outflow pipes connected to a distribution box.All pipes will be 4" PVC tight lines and range in length, with the minimum length being 2 linear feet. At the transition to the perforated lines, the pipes will drop 2" to the edge of the leach field. At the edge of the leach field, the 4" PVC tight lines will be connected to perforated leach lines. All perforated leach lines will lay flat and have a 4" diameter. Laterals for Each Filter Bed:4" PVC perforated lines with inspection parts. Pipes will be 70 feet long and placed at 10 feet on-center across 50 linear feet. VI. Nitrate Loading Study & Soil Suitability Study: The Nitrate Loading and Soil Suitability Study performed by Chesney Consulting in 2019 can be found in Appendix A, and the County Nitrate Loading Analysis with the proposed ADF for Buildings H and I can be found in Appendix B. Stockton San Jose Sacramento Modesto 3428 Brookside Rd. 111 N. Market St.,#300 900 Howe Ave,#200 100 Sycamore Ave,#100 Stockton, CA 95219 San Jose, CA 95113 Sacramento, CA 95825 Modesto, CA 95354 t:209.943.2021 t:408.754.2021 t:916.520.2777 t:209.762.3580 F:\17projects\17017 Holly Sugar Industrial\Civil\Septic Sizing-Prelim\17017 H&I Sanitary Sewer Design Criteria Memo.docx