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San Joaquin County <br /> oaQu��y .o Environmental Health Department DIRECTOR <br /> a: --ta--, 1868 East Hazelton Avenue Linda Turkatte,REHS <br /> Stockton, California 95205-6232 PROGRAM COORDINATORS <br /> Robert McClellon,REHS <br /> Jeff Carruesco,REHS,RDI <br /> Website: www.sjgov.org/ehd Kasey Foley, REHS <br /> I F o R Rodney Estrada,REHS <br /> Phone: (209) 468-3420 Adrienne Ellsaesser, REHS <br /> Fax: (209) 464-0138 <br /> February 11, 2015 <br /> James E. Blincoe Trust <br /> Attn: Janet Blincoe <br /> 14501 Wells Ln. <br /> Lodi, CA 95240 <br /> Subject: Preliminary Site Assessment Report- Response Site Code: 2118 <br /> 2431 East Mariposa Road <br /> Stockton, CA 95205 <br /> The San Joaquin County Environmental Health Department (EHD) has reviewed Preliminary <br /> Site Assessment Report (PSAR) dated 20 October 2014, and Underground Storage Tank & <br /> Piping Removal Report (USTR) dated 24 March 2014, both prepared by Advanced <br /> GeoEnvironmental, Inc. (AGE). The EHD discussed the analytical findings contained in the <br /> PSAR and USTR with a representative of the Central Valley Regional Water Quality Control <br /> Board (CVRWQCB) on 14 January 2015 and determined that the case involving the two former <br /> diesel underground storage tanks (USTs) is eligible for closure as a soil-only case. <br /> In March 2014, after the two diesel USTs were removed, soil samples were taken at <br /> approximately 15 feet below surface grade (bsg) where the USTs were situated. Analysis of the <br /> soil samples yielded a maximum of 13,000 milligrams per kilogram (rng/kg) of total petroleum <br /> hydrocarbons as diesel (TPH-d). In May 2014, approximately 125 cubic yards of petroleum <br /> hydrocarbon-impacted soil were excavated from the northern end of the former UST area to a <br /> depth of approximately 25 feet bsg. Analysis of soil samples taken from the excavation yielded a <br /> maximum of 2,600 mg/kg TPH-d. Analysis of stockpile samples from the excavation yielded a <br /> maximum of 16,000 mg/kg TPI-(-d. All excavation and stockpile soil samples were non-detect for <br /> rnethyl tertiary-butyl ether (MTBE_) and benzene. In July 2014, four soil borings were advanced <br /> adjacent to and within the area of the former USTs to a depth of approximately 40 feet bsg. Soil <br /> samples taken at various depths throughout each boring yielded non-detect results for TPH-d, <br /> naphthalene, and benzene, toluene, ethylbenzene, xylene (BTEX). <br /> Based on the data presented in the PSAR and USTR, the EHD concurs with AGE's conclusion <br /> that this case meets Low-threat Underground Storage lank Case Closure Policy (LTCP) <br /> conditions. As required by the LTCP enacted by the State Water Resources Control Board <br /> (State Nater Board) on 17 August 2012, "Municipal and county water districts, water <br /> replenishment districts, special act districts with groundwater management authority, agencies <br /> with authority to issue building permits for land affected by the petroleum release, owners and <br /> occupants of the property impacted by the petroleumn release, and the owners and occupants of <br /> all parcels adjacent to the impacted property shall be notified of the proposed case closure and <br /> provided a 60 day period to comment." Those to be notified include, but are not limited to: East <br /> Bay Municipal Utility District, California Water Service Company in Stockton, San Joaquin <br /> County Public Works Utilities Maintenance, Stockton East Water District, Stockton Municipal <br /> Utilities Department, Stockton Community Development Department and Stockton Public Works <br /> Department. <br />