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,./ N%_e San Joaquin County Environmental Health Department 1868 East Hazelton Avenue Stockton, California 95205-6232 Levand Family Trust 24692 Sand Wedge Lane Valencia, CA 91355 Website: www.s'ov.org/ehd Phone: (209) 468-3420 Fax: (209) 464-0138 November 25, 2014 DIRECTOR Linda Turkatte, REHS PROGRAM COORDINATORS Robert McClellon, REHS Jeff Carruesco, REHS, RDI Kasey Foley, REHS Rodney Estrada, REHS Adrienne Ellsaesser. REHS Subject: Preliminary Site Assessment Work Plan Site Code: 0002108 Levand Family Trust 47 East 11th Street Tracy, California 95376 The San Joaquin County Environmental Health Department (EHD) has reviewed Preliminary Site Assessment Work Plan (Work Plan), dated 24 September 2014, prepared by Advanced GeoEnvironmental, Inc. (AGE). The work plan was submitted in response to EHD letter dated May 19, 2014, directing the assessment of the lateral and vertical extent of contamination that resulted from the unauthorized release from a former underground storage tank (UST) system. In the work plan, AGE proposes to: • Advance a total of eight soil borings using direct push technology; • Advance one soil boring in the center of the UST excavation, beneath sample BT2- Center 11ft, to approximately 40 feet below surface grade (bsg); termination of this boring may occur prior to 40 feet bsg if field observations indicate hydrocarbon impact has been vertically assessed; conversely, this boring may be advanced to 50 feet bsg if hydrocarbon impact is observed at 40 feet bsg; • Advance seven soil borings to approximately 20 feet bsg at the following approximate locations relative to the UST excavation: 10 feet south, 25 feet east, 15 feet west, 20 feet north, 40 feet north, 70 feet north, and 55 feet northeast; • During advancement of each boring, discrete soil samples will be collected at five-foot intervals for visual classification and field screening using a photo -ionization detector (PID); • From each boring outside of the UST excavation, grab groundwater samples will be collected from four feet into the water -bearing zone as identified by the collection of a saturated soil sample; • From the boring in the center of the UST excavation, two grab groundwater samples will be collected; one sample will be collected at the top of the groundwater table and one sample will be collected at total depth; • Analyze selected soil and groundwater samples for Total Petroleum Hydrocarbons as Gasoline (TPH-g), benzene, toluene, ethylbenzene, and xylenes (BTEX), methyl -tertiary butyl ether (MTBE), tertiary-arnyl methyl ether (TAME), tertiary butanol (TBA), ethyl dibromide (EDB) and 1,2-dichloroethane (1,2 -DCA);