Laserfiche WebLink
c` SAN JOAQUIN <br />' <br />--COUNTY— <br />Greatness grows here. <br />January 3, 2019. �� <br />Javier Leon <br />484 Pestana Ave <br />Manteca, CA 95336 <br />RE: Soil Suitability/Nitrate Loading Study <br />228 Klo Rd, Lathrop <br />APN 191-24-018, SR0081371 <br />Environmental Health Department <br />Kasey Foley, REHS, Interim Director <br />PROGRAM COORDINATORS <br />Robert McClellon, REHS <br />Jeff Carruesco, REHS, RDI <br />Willy Ng, REHS <br />Muniappa Naidu, REHS <br />Michael Kith, REHS <br />Melissa Nissim. REHS <br />The San Joaquin County Environmental Health Department (EHD) has reviewed the Soil Suitability/Nitrate <br />Loading (SSNL) Study, dated October 23, 2019, submitted on November 5, 2019, for the above noted <br />location, and has the following comments for your consideration. <br />The SSNL was prepared to determine the suitability of the above noted parcel for onsite wastewater treatment <br />system (OWTS) usage and the potential impact of nitrate to groundwater for the proposed project <br />development. The proposed development project includes: <br />A 1,620 square foot two bed -room residence. <br />2. The OWTS usage with waste water of 280 gallons a day from existing residence and 280 gallons <br />day from proposed two bedroom residence totaling in 456 gallons a day. <br />The estimated nitrate loading from this existing and proposed usage shows a potential for nitrate impact to <br />groundwater above water quality objectives. According to SSNL Study, the estimated nitrate loading from this <br />existing and proposed OWTS usage is 14.96 mg/L-N; it is above the water quality objective of 10 mg/L-N. <br />Based on the information provided, the EHD can make the following findings. <br />1. The SSNL Study supports the suitability for OWTS usage with the following conditions: <br />a. The potential impact of the nitrate to ground water shall be mitigated. OWTS shall utilize <br />supplemental treatment and meet performance requirements in Section 10.9 of Regional Water <br />Quality Control Board OWTS policy (Boards Policy). <br />b. A Registered Civil Engineer shall submit complete engineering design plan to EHD for approval <br />prior to issuance of building permit. Fee will be based on the current fee schedule at time of <br />payment. <br />c. Percolation test conducted at the site percolates at the rate of 20.83 minute per inch. The OWTS <br />shall have a minimum distance of 8 feet from bottom of dispersal system to groundwater. <br />d. Annual permit is required. Fee for annual operating permit is due at time of OWTS permit <br />application. <br />e. To monitor the effectiveness of the supplemental treatment system, quarterly sampling of the <br />effluent and under leach field is required. The first sampling shall be done six (6) months after the <br />OWTS installation. Sampling results shall be submitted to EHD for review. The EHD may reduce <br />the sampling frequency after one year of sampling. <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 />