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SAN JOAQUI N Environmental Health Department <br />COUNTY Jasjit Kang, REHS, Director <br />cP, <br />Greatness rows here. Muniappa Naidu, REHS, Assistant Director <br />moa; 9 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 />October 4th, 2022 <br />Joel Montano <br />PO Box 2180 <br />Lodi, CA. 95241 <br />RE: Soil Suitability & Nitrate Loading Study <br />550 & 598 N. Hewitt Rd., Linden <br />APN: 093-030-61, -63, SR0085847 <br />The San Joaquin County Environmental Health Department (EHD) has reviewed the Soil Suitability/Nitrate Loading <br />(SSNL) Study, dated September 2022 and has the following comments for your consideration. <br />The SSNL was prepared to determine the suitability of onsite wastewater treatment system (OWTS) usage and the <br />potential long-term impact of nitrate to groundwater from the proposed creation of a 4.7 acre, 5.8 acre, 4.5 acre, 4.1 <br />acre parcel, and a 2.0 acre designated remainder. In addition to the newly formed parcels, a 4.9 acre parcel will be <br />formed through a lot -line adjustment. <br />Based on the information provided, the EHD can make the following findings <br />Based on the information provided in SSNL study, the EHD finds that the long-term addition of nitrates <br />added to the sites, will be acceptable within the acceptable level of 10 mg/L if standard residential <br />construction is completed (i.e. a three bedroom single-family residence). Calculations in the SSNL study <br />indicate an estimated level of 4.24 mg/L, 3.98 mg/L, 3.35 mg/L, 3.86 mg/L, and 7.02 mg/L of nitrates for <br />the four proposed lots and the designated remained. The acceptable size of the septic tanks required on <br />the parcels will be dependent on the size of the future construction. <br />Percolation tests conducted on August 12th, 2022 yielded a percolation rate of 25 minutes/inch, 25 <br />minutes/inch, 25 minutes/inch, 50 minutes/inch, and 36 minutes/inch. At this rate, an eight -foot soil <br />separation for all parcels with rates between 5 minutes/inch and 30 minutes/inch shall be required between <br />the bottom of dispersal field and groundwater. This includes the lots specified in the SSNL as lot 3, 4, and <br />the designated remainder. In addition a five-foot soil separation shall be required between the bottom of <br />dispersal field and groundwater for the two remaining parcels, as percolations rates fell between 30 <br />minutes/inch and 120 minutes per inch. These requirements are pursuant to San Joaquin County Onsite <br />Wastewater Treatment Standard table 1.10.2. Per the SSNL Study, groundwater on sites are reported <br />between 150 and 160 feet below surface grade. <br />3. 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 Michael Suszycki, Senior Registered Environmental Health Specialist, at <br />msuszycki@sjgov.org or (209) 598-7001. <br />Steven Shih, REHS <br />Program Coordinator <br />c: Nancy Butler & Salvador Rivera 550 N. Hewitt Rd., Linden, CA. 95236 <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 />