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<br /> San Joaquin County
<br /> oP Environmental Health Department DIRECTOR
<br /> Donna Heran, REHS
<br /> r. `• 600 East Main Street
<br /> :{ Stockton, California 95202-3029 PROGRAM COORDINATORS
<br /> Robert McClellon, REHS
<br /> �, •' Jeff Carruesco, RENS, RDI
<br /> cq• - �P Website: www.sjgov.org/ehd Kasey Foley, REHS
<br /> F o R Linda Turkatte, REHS
<br /> Phone: (209)468-3420
<br /> Fax: (209)464-0138
<br /> April 1, 2011
<br /> Mr. John Johnson
<br /> Former Cheaper Store Number 37
<br /> 765 Eubanks Drive, Suite D
<br /> Vacaville, California 95688
<br /> Subject: Former Cheaper Store Number 37
<br /> 15 East Grant Line Road
<br /> Tracy, California 95376-2720
<br /> Dear Mr. Johnson:
<br /> The San Joaquin County Environmental Health Department (EHD) has reviewed Soil Gas
<br /> Study Activities (soil gas report), dated 06 January 2011, prepared and submitted by ATC
<br /> Associates Inc. (ATC) on your behalf for the above-referenced site. In the soil gas report,
<br /> ATC describes the advancement of four soil borings (SG1 through SG4) to approximately six
<br /> feet below surface grade (bsg) and completion as temporary soil gas sampling points. Soil
<br /> was collected from the soil borings for lithological evaluation and a photo-ionization detector
<br /> was employed to detect petroleum hydrocarbon vapors in the soil drill cuttings. Soil samples
<br /> collected from borings SG1 and SG4 were analyzed by a California-certified off-site laboratory
<br /> for total petroleum hydrocarbons as gasoline (TPHg); benzene, toluene, ethylbenzene, and
<br /> total xylenes (BTEX); methyl tertiary-butyl ether (MTBE), ethyl tertiary-butyl ether (ETBE), di-
<br /> isopropyl ether (DIPE), tertiary-butyl alcohol (TBA), tertiary-amyl methyl ether (TAME), 1,2-
<br /> dichloroethane (1,2-DCA), and 1,2-dibromoethane (EDB) by Environmental Protection Agency
<br /> (EPA) method 8260B. Chemicals of concern were not detected in either soil sample.
<br /> Utilizing leak check compound 1,1-difluoroethane (1,1-DFA), soil gas samples were collected
<br /> in 50-milliliter (mL) dedicated glass syringes by an on-site California State-certified mobile
<br /> laboratory and analyzed for TPHg, BTEX, MTBE, ETBE, DIPE, TBA, TAME, 1,2-DCA, EDB
<br /> and 1,1-DFA by EPA method 8260B. Additional soil gas samples were collected in 400-mL
<br /> Summa® canisters from the four sampling points, including one duplicate soil gas sample
<br /> collected from SG1, and soil gas samples SG1, SG4, and the duplicate, were analyzed by an
<br /> off-site California State-certified laboratory for TPHv (C5-C11), BTEX, MTBE, ETBE, DIPE,
<br /> TBA, TAME, 1,2-DCA, EDB and 1,1-DFA by EPA method TO-15 while soil gas samples SG2
<br /> and SG3 were analyzed for TPHg (C5-C11) by method LUFT/EPA 8260B and BTEX, MTBE,
<br /> ETBE, DIPE, TBA, TAME, 1,2-DCA, EDB and 1,1-DFA by EPA method 8260B. Soil gas
<br /> samples SG1 and SG2 were also analyzed for carbon dioxide and oxygen by American
<br /> Society for Testing and Materials (ASTM) 1945-96 and methane by EPA method 8015M.
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