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ultv <br />°Pc SAN JOAQUIN <br />"` < COUNTY <br />Greatness grows here. <br />April 19, 2023 <br />Environmental Health Department <br />To: San Joaquin County Community Development Department <br />Attention: Giuseppe Sanfilippo <br />From: Jeffrey Wong; 209-468-0335 <br />Lead Senior Registered Environmental Health Specialist <br />RE: PA -2200157 (IP), Referral, S00015201 <br />12470 East Locke Road, Lockeford <br />Jasjit Kang, REHS, Director <br />Muniappa Naidu, REHS, Assistant Director <br />PROGRAM COORDINATORS <br />Jeff Carruesco, REHS, RDI <br />Willy Ng, REHS <br />Michael Kith, REHS <br />Michelle Henry, REHS <br />Elena Manzo, REHS <br />The following requirements were identified as pertinent to PA -2000007 (PP) and the current status of the <br />conditions are provided below as requested through PA -2200157. <br />1. A soil suitability and nitrate loading study incorporating proposed staff and customer use shall be <br />submitted to the Environmental Health Department, indicating that the area is suitable for septic <br />system usage. The studies must be approved by the Environmental Health Department prior to <br />issuance of a building permit. (San Joaquin County Development Title, Section 9-1105.2(d)). The <br />fee will be based on the current schedule at the time of payment. <br />The sewage disposal system shall comply with the onsite wastewater treatment systems <br />standards of San Joaquin County prior to approval. A percolation test conducted in accordance <br />with the E.P.A. Design Manual - Onsite Wastewater and Disposal Systems is required for each <br />parcel. The fee will be based on the current schedule at the time of payment. <br />The condition has been satisfied. EHD has accepted an updated calculation of the <br />nitrate loading concentration. The original calculation was provided in the <br />Addendum to the Soil Suitability / Nitrate Loading Study dated June 20, 2006 (the <br />Addendum) prepared by Neil Anderson and Associates for another landuse project. <br />The Addendum calculation used an average daily flow (ADF) value of 842 gallons <br />per day (gpd), which exceeds the value of 450 gpd as proposed in this reference <br />PA -2200157 project (the 450 gpd is based on the proposed 30 employees over 4 <br />shifts at 15 gallons / employee.) The updated calculation keeps the original ADF of <br />842 gpd, but substitutes a more conservative value of 85 mg/L-N for Effluent Stream <br />Nitrate concentration (Nw) over the original lower value of 50 mg/L-N used in the <br />Addendum since EHD requires 85 mg for commercial septic systems. The result of <br />the updated mass -balance calculation of Total Nitrate -N percolate concentration to <br />groundwater (Nr) is 6.36 mg/L-N (compared to 4.1 mg/L-N calculated in the 2006 <br />Addendum), which is below the maximum contaminate level for nitrogen of 10 mg/L- <br />N. <br />1868 E. Hazelton Avenue I Stockton, California 95205 1 T 209 468-3420 1 F 209464-0138 1 www.sjgov.org/ehd <br />