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CM <br />DILLON & MURPHY <br />E N G I N E E R I N G <br />847 N. Cluff Avenue, Suite A2 • Lodi, California 95240 <br />P.O. Box 2180 Lodi, California 95241 <br />(209) 334-6613 Fax (209) 334-0723 <br />April 25, 2022 <br />San Joaquin County <br />Environmental Health Department <br />1868 E. Hazelton Avenue <br />Stockton, CA 95202 <br />Attn: Steven Shih <br />Re: Addendum to Nitrate Loading Study <br />for 11250 Micke Grove Road <br />Dear Steven, <br />The original Nitrate Loading Study, submitted on November 23, 2021 and conditionally <br />approved on December 14, 2021 was prepared for 12 duplex units with 3 bedrooms <br />each. <br />The project has since been updated to 12 duplex units with 2 bedrooms each. The <br />waste loading was determined under the assumption of 100 gal/day for primary <br />bedrooms and 50 gal/day per additional bedroom, or 150 gal/day/unit. The total waste <br />loading for the site under these conditions would be 1800 gal/day. <br />Additionally, the net rainfall recharge was revised based on the most recent CIMIS <br />Linden rain gauge data and plant factors for the final site development conditions. All <br />stormwater is to be retained on-site and therefore the average runoff volume is <br />assumed to be zero. <br />Given the above criteria and new project conditions the Nitrate Loading was determined <br />to be 9.29 mg/L. See attached Nitrate Loading calculations. <br />Sin rely, <br />7 <br />James Selke <br />JS/cg <br />Enc. <br />YADMDOM2020\2045\Nitrate Loading Study Addendum 042522.docx <br />