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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 <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 />