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Iry <br />SAN JOAQUIN <br />COUNTY <br />�11F Greatness grows here. <br />November 7, 2022 <br />Don Chesney <br />Chesney Consulting <br />P.O Box 3794 <br />Turlock, CA 95381 <br />RE: Soil Suitability/Nitrate Loading Study <br />7681 W. Linne Rd., Tracy <br />APN:248-080-38, SR00796 <br />Environmental Health Department <br />Jasjit Kang, REHS, Director <br />Muniappa Naidu, REHS, Assistant Director <br />PROGRAM COORDINATORS <br />Jeff Carruesco, REHS, RDI <br />Willy Ng, REHS <br />Steven Shih, REHS <br />Michelle Henry, REHS <br />Elena Manzo, REHS <br />The San Joaquin County Environmental Health Department (EHD) has reviewed the Nitrate Loading Study <br />(NLS) dated October 31, 2022 for the above noted location and has the following comments for your <br />consideration. <br />The NLS was prepared to determine the suitability of the above noted parcel for onsite wastewater treatment <br />system (OWTS) usage and the potential long-term nitrate loading impact to groundwater from the proposed <br />addition of a two bedroom accessory dwelling. <br />Based on the information provided the EHD can make the following findings: <br />a. 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 />b. Percolation test conducted on January 5, 2022 yields a percolation rate of 7.5 min/inch. At this rate an <br />8 foot soil separation is required between bottom of dispersal field and groundwater (San Joaquin <br />County OWTS Standard Table 1.10.2). Groundwater is reported at 88 to 92 feet below surface. <br />c. It is recommended in the report to install a 1,600 gallon septic tank to further reduce the nitrate loading <br />from 9.1 parts per million (ppm) to 6.6 ppm. <br />If you have any questions please contact Frank Girardi, Senior Registered Environmental Health Specialist, <br />at fvgirardi@sjgov.org or (209) 616-3044. <br />avnfh, EHS <br />Program Coordinator <br />CC: Roddan Construction, Inc.; 289 John Kamps Way; Ripon, Ca. 95366 <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 />