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MEMORANDUM Page 3 of 3 <br /> Holly Commerce Center E&E <br /> Tracy, CA �® S I E G F R I E D <br /> Therefore: <br /> n,=Wnw(1-d)+Rnb/(W+R) <br /> = ((2.8334 ac-ft/yr x 146 mg N/L)x (1-0.30) + (31.7572 ac-ft/yr x 0.10 ppm))/(2.8334 ac-ft/yr+ 31.7572 <br /> ac-ft/yr) <br /> = 8.46 ppm as nitrate-nitrogen (NO3-N) amount falls below the 10ppm threshold <br /> V. Annual Rainfall-Recharge Value <br /> Table 4 on Pages 6 and 7 of the Chesney Report Dated May 6, 2019 was placed in the report to illustrate <br /> the impacts of grass growth on the leach field and the care that must be taken with landscape care and <br /> irrigation. Per section II above the rate used for recharge is now calculated using the suggestions in <br /> Attachment 1 and an annual rainfall depth of 9.5" per the attached County standard drawing D-3. <br /> VI. Attachments <br /> 1. Attachment 1; Recommended Alternate Nitrate Loading Analysis for Heavily <br /> Developed/Impervious Site Conditions <br /> 2. Future Expansion Area Exhibit and Calculations <br /> 3. San Joaquin County Standard Drawing D-3 <br /> 4. Plan check letter dated August 15, 2019 <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 /> F:\17projects\17017 Holly Sugar Industrial\Civil\Septic Sizing-Prelim\17017 Holly Commerce Center E&E Nitrate Loading Memo <br /> Ver 3.docx <br />