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SAN J O A Q U I N Environmental Health Department <br /> COUNTY Jasjit Kang, REHS, Director <br /> Greatness grows here. <br /> Muniappa Naidu, REHS,Assistant Director <br /> PROGRAM COORDINATORS <br /> Robert McClellon, REHS <br /> Jeff Carruesco, REHS, RDI <br /> Willy Ng, REHS <br /> Steven Shih, REHS <br /> Michelle Henry, REHS <br /> Elena Manzo, REHS <br /> June 29, 2022 <br /> California Yards, LLC <br /> 2804 Bigge St. <br /> San Leandro, Ca. 94577 <br /> RE: Soil Suitability/Nitrate Loading Study <br /> 23751 S. Bird Rd. Tracy, Ca. 95304 <br /> APN: 250-100-15, SR0085397 for PA-1800080 (UP) <br /> The San Joaquin County Environmental Health Department (EHD) has reviewed the Soil Suitability/Nitrate <br /> Loading (SSNL) Study dated June 10, 2022, which addresses exclusively Phase I of the above-referenced <br /> landuse project (PA-1800080), and has the following comments for your consideration. <br /> The SSNL was prepared to determine the suitability of onsite wastewater treatment system (OWTS) usage <br /> and the potential long-term impact of nitrate to groundwater from the proposed office building. <br /> Based on the information provided, the EHD can make the following findings: <br /> 1. Based on the information provided, the EHD finds that the SSNL Study supports the suitability for <br /> standard OWTS usage for the proposed development pursuant to San Joaquin County Ordinance <br /> Code Title 9, Section 9-1105.2(d). <br /> 2. Section IV Item B of the SSNL Study proposes an engineer designed 50-foot x 9-foot filter bed and a <br /> 2000-gallon septic tank. If this engineer design is to be installed instead of a standard OWTS which <br /> the dimension the EHD would normally calculate for, an engineer OWTS permit must be obtained <br /> instead of a standard OWTS permit (Program Element (PE) 4231 for Engineer Designed Commercial <br /> System of EHD fee Schedule), along with Annual Operating Permit (PE 4232, Section 2.10.1 of SJC <br /> OWTS Standards), and be operated and maintained pursuant to an Operations and Maintenance Plan <br /> compiled by the OWTS designer (Section 1.12.1 of the OWTS Standards). <br /> 3. Percolation test conducted on May 25, 2022 yielded a percolation rate of 17.9 minutes/inch. At this <br /> rate, an eight-foot soil separation shall be required between bottom of dispersal field and groundwater <br /> pursuant to San Joaquin County Onsite Wastewater Treatment Standard table 1.10.2. Per SSNL <br /> Study, groundwater on site is reported between 77.2 feet below surface grade. <br /> 4. The OWTS and its 100% replacement areas shall meet all required minimum setbacks stated in San <br /> Joaquin County (OWTS) Standard and Well Standard. <br /> If you have any questions please contact Jeffrey Wong, Lead Senior Environmental Health Specialist, at <br /> jwong@sjgov.org or (209)468-0335. <br /> " � <br /> -Fob Steven Shih, REHS ' <br /> Program Coordinator <br /> C: Don Chesney, Chesney Consulting P.O. Box 3794, Turlock, CA. 95381 <br /> 1868 E. Hazelton Avenue I Stockton, California 95205 1 T 209 468-3420 1 F 209 464-0138 1 www.sjgov.org/ehd <br />