SITE INFORMATION AND CORRESPONDENCE FILE 1

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ii San Joaquin County DIRECTOR Donna Heran, REHS OP, . . . . . . . p Environmental Health Department _- . bb o p ASSISTANT DIRECTOR 600 East Main Street Laurie Cotulla, RENS X Stockton California 95202-3029 � PROGRAM COORDINATORS - - Carl Bergman, REHS • p - ' p Mike Huggins, REFS, RDI � r , Website: www.sjgov. org/ehd Margaret Lagorio, REFS a Fo'e Phone: (209) 468-3420 Robert M Clellon, REHS Fax : (209) 464-0138 Jeff Carruesco, REFS, RDI Kasey Foley, REFS January 12, 2009 Mr. R. Ellis, Jr. Ms. Ethyl D . Ellis, Trustee et alia 1991 West Lincoln Road Stockton, California 95207-2462 Subject: California Tank Lines, Inc. 3105 South El Dorado Street Stockton, California 95206 The San Joaquin County Enviromnental Health Department (EHD) has reviewed Site Investigation Results and Site Conceptual Model, dated September 30, 2008, prepared and submitted by Western Resource Management (WRM) on your behalf for the above-referenced site. In the report, WRM presents lithological and analytical data from the cone penetration test (CPT) investigation involving the advancement of four CPT borings to approximately 125 feet below surface grade (bsg) and collection of groundwater samples from soil borings Pl , P2, P3, P4, and S-5 in October 2007 . Although the report mentions that soil samples were collected from soil borings P-2 and S-5 and analyzed for percent carbon by weight and total effective porosity, these soil results were not included in the report. Provide the data to the EHD by February 27, 2009. WRM reported that of the fifteen groundwater samples collected from soil borings Pl , P2, P3 , P4, and S-5 , only groundwater samples collected from P2 and S-5 contained significant concentrations of contaminants of concern. Total petroleum hydrocarbons quantified as gasoline (TPHg) were detected at 1 ,680 micrograms per liter (rg/L), benzene was detected at 30.7 µg/L, di-isopropyl ether (RIPE) was detected at 837 µg/L, and 1 ,2-dieWoroethane ( 1 ,2-DCA) was detected at 215 µg/L in groundwater collected at thirty-five feet bsg from P2. Methyl tertiary- butyl ether (MTBE) was detected at 1 . 01 pg/L and 1 ,2-DCA was detected at 13 . 5 ug/L in groundwater collected at sixty-five feet bsg from S-5 . DIPE was also detected at 4 . 04 pg/L, 6 . 68 µg/L, and 26.4 µg/L at 57 feet, 90 feet, and 115 feet bsg in groundwater collected from P2 . WRM presented a site conceptual model (SCM) that indicated the primary source area for TPHg has been centered near monitoring well MW-4, while total extractable petroleum hydrocarbons quantified as diesel (TPHd) have historically been detected near MW- 1 and MW-2, and total extractable petroleum hydrocarbons quantified as motor oil (TPHmo) have historically been detected near MW-2 . These conclusions were supported by results from groundwater collected