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MEMORANDUM Page 3of6 E.■ <br /> Holly Trading <br /> Tracy,, CA 00 S I E G F R I E D <br /> CA <br /> Soil Acceptance Rate (Chesney 2019) = 0.311 gal/sqft/day (see Appendix A, page 9) <br /> Minimum Filter Bed Size for Soil Acceptance Rate = 960 gal/day ADF/0.311 gal/sqft/day= 3,087 sqft <br /> Actual square footage within the Infiltrator chambers: <br /> Total SF= 33.75 ft* 96.0 ft= 3,240 sqft> 3,087 sqft <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 /> Surge Tank Capacity: Siegfried recommends that the surge/dosing tank be sized to hold one ADF. <br /> This will provide capacity to allow the septic tanks to continue discharging to the end of the workday <br /> when the surge tank pump is offline due to unforeseeable problems(provided the surge tank pumps <br /> were working properly the day prior and emptied the surge tank as designed). Since the primary <br /> septic tanks were sized to provide a minimum of one day detention and the surge/dosing tank was <br /> sized to provide a minimum of one day detention, the total detention time for effluent treatment is 4 <br /> days minimum, which is consistent with Orenco's recommended detention time of 2-3 days. <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 /> There will be six (6) outflow pipes connected to the distribution box. All pipes will be 4" PVC tight <br /> lines and range in length, with the minimum length being 2 linear feet. At the transition to the <br /> perforated lines, the pipes will drop 2" to the edge of the leach field. At the edge of the leach field, <br /> the 4" PVC tight lines will be connected to perforated leach lines. All perforated leach lines will lay <br /> flat and have a 4" diameter. <br /> Laterals for Each Filter Bed: 4" PVC perforated lines with inspection parts. Pipes will be 33.75 feet <br /> long and placed 12 feet on-center across 96 linear feet. <br /> VI. Nitrate Loading Study & Soil Suitability Study: <br /> The Nitrate Loading and Soil Suitability Study performed by Chesney Consulting in 2019 can be found in <br /> Appendix A. <br /> VII. Soil and Groundwater Testing: <br /> The Soil and Groundwater Testing performed by Chesney Consulting in 2019 can be found in Appendix B. <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 />