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GFIPKG <br /> PUBLIC HEALTH SERVICES <br /> SAN JOAQUIN COUNTY i <br /> ' ENVIRONMENTAL HEALTH DIVISION <br /> Ernest N1. Fujimoto, M.D., M.P.H., Acting Health Officer <br /> L'Fait <br /> 445 N. San Joaquin Street • P.O Box 388 • Scopy <br /> (209) 468-3420 <br /> MARLA D GUENSLER <br /> EXXON COMPANY USA �9 <br /> MARKETING DEPARTMENT <br /> 2300 CLAYTON RD S" 2250 <br />' CONCORD CA 94524-2032 <br /> RE Former E.�con Service Station RAS- No 7-1050 <br /> ' On March 9, 1994 the San Joaquin County Environmental Health Division (PHS/Fl-ID) Technical Review <br /> Committee and the Ce=al Valley Regional Water Quality Control Board (CVRWQCB) discussed the above <br /> referenced site <br /> The TRC determined :alai more data is needed to issue sue certification and closure Sampling will be <br /> required at two locations at the site The first sample location will be within five feet laterally of piping <br /> sample S-3-TR5 The aenth of the samples shall be between 10 and 40 feet. The purpose of these samples <br /> are to determine the ver?cal extent of soil contamination beneath the piping and to verify the effectiveness <br /> of the vapor extraction system on the west wall <br /> The secona sample locar�on will be within 5 feet laterally of MW-1 The depth of these samples will be from <br /> 35 feet to first grounawater (approximately 60 to 70 feet) The purpose of these samples are to determine <br /> if the sample results or 6/26/87 which were TPH-g 2750 ppb, benzene 62 2 ppb, toluene 1414 ppb, ethyl <br /> ' benzene 155 4 ppb, ara total xylenes 772 4 ppb, became nondetectable after that date as a result of the <br /> static water level in Ni5V-1 dropping below the containnnatea soil <br /> Donna Heran, RENS, 1kYector <br /> Environmental Health Division <br /> Harlin Knoll, Senior RE:S Diane M. Hinson, RENS <br /> Site Mitigation Unit Supervisor <br /> � <br /> HK <br /> ' ✓cc Paul K. Graff, =ugTo West Inc <br /> 1050 Melody bane, Suite 160 <br /> ' Roseville, CA 95678 <br /> cc CVRWQCB, Elizaoeth Thayer <br />