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MEMORANDUM Page 3 of 3 <br />Holly Commerce Center E&E <br />Tracy, CA <br />Therefore: <br />■ ■' <br />00 SIEGFRIED <br />nr = Wnw(1-d)+Rnb / (W+R) <br />= ((0.7660 ac-ft/yr x 146 mg N/L) x (1-0.30) + (31.7572 ac-ft/yr x 0.10 ppm)) / (0.7660 ac-ft/yr + 31.7572 <br />ac-ft/yr) <br />= 2.5047 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 <br />3428 Brookside Rd. <br />Stockton, CA 95219 <br />t: 209.943.2021 <br />San Jose <br />111 N. Market St., 4300 <br />San Jose, CA 95113 <br />t: 408.754.2021 <br />Sacramento <br />900 Howe Ave., #200 <br />Sacramento, CA 95825 <br />t: 916.520.2777 <br />Modesto <br />100 Sycamore Ave, #100 <br />Modesto, CA 95354 <br />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 1.docx <br />