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San Joaquin County <br /> Environmental Health Department DIRECTOR <br /> 1868 East Hazelton Avenue Linda Turkatte,REHS <br /> W - PROGRAM COORDINATORS <br /> Stockton, California 952056232 PR <br /> (} Robert McClellon, REHS <br /> :•. Jeff Carruesco,RENS,RDI <br /> C���FpRci�P Website: www-slgov.org/ehd Kasey Foley,REHS <br /> REHS <br /> R <br /> a, <br /> Rodney Estrada,Phone: (209) 468-3420 Adrienne StradEllsaR REHS <br /> Fax: (209)464-0138 <br /> April 1, 2015 <br /> Ernesto Renteria, Jr. <br /> 3312 West Creek Drive <br /> Stockton, CA 95209 <br /> Subject: Pimentel Property <br /> 1650 S. EI Dorado Street <br /> Stockton, CA 95219 <br /> The San Joaquin County Environmental Health Department (EHD) has reviewed Additional Site <br /> Assessment Report (ASAR), dated 16 October 2014, and Phase 11 Site Assessment Report (Phase <br /> //), dated 25 November 2013, both prepared by your consultant Advanced GeoEnvironmental, Inc. <br /> (AGE). The EHD also referred to Phase 11 Site Assessment Work Plan (Work Plan) dated 21 <br /> October 2013 and Phase 11 Site Assessment Work Plan Addendum (Addendum) dated 25 <br /> September 2014 for additional information. <br /> According to the information presented in Phase I/, the site was the location of a dry cleaning facility <br /> from circa 1911 to 1960, and potentially utilized an underground storage tank (UST) for petroleum <br /> hydrocarbon fuel. The structures and surface materials from the time of this property usage no <br /> longer exist, so there is some uncertainty as to the exact locations of critical dry-cleaning equipment <br /> when employed on the site. <br /> The scope of work performed for Phase // included advancement of two soil borings (131 and 132) in <br /> the location of the former dry cleaning facility and one soil boring (133) in the inferred former location <br /> of the UST to collect soil and grab groundwater samples for laboratory analysis for potential <br /> chemicals of concern (CDCs) such as total petroleum hydrocarbons quantified as gasoline (TPHg) <br /> and volatile organic compounds (VOCs). <br /> Neither soil nor groundwater samples collected from borings B1 and B2 were impacted by COCs, <br /> but the two soil samples from 15 feet and 20 feet below surface grade (bsg) analyzed from boring <br /> B3 were impacted by TPHg and various VOCs, but not by benzene, toluene, ethylbenzene or <br /> xylenes (BTEX); the groundwater sample from B3 was impacted by TPHg and the various VOCs, <br /> including toluene, ethylbenzene and xylenes. Naphthalene was detected in the B3 soil and <br /> groundwater samples. AGE noted intense hydrocarbon odor and discoloration in soil samples <br /> collected from 10 feet to 30 feet bsg in B3. Based on the findings presented in Phase //, AGE <br /> recommended additional investigation. <br /> For the additional assessment, as reported in ASAR, AGE advanced three borings (134 through 136) <br /> to 3 feet bsg to collect soil gas samples and one boring (137) to 40 feet bsg on the west side of the <br /> property to collect soil and groundwater samples for laboratory analysis for the CDCs. One soil gas <br /> sample (134) was collected in the approximate footprint of the dry cleaning-facility building, one (135) <br />