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MURRAY & ASSOCIATES <br /> � ENVIRONMENTAL SERVICES <br /> July 17, 1991 <br /> J U L 1 & IPP, <br /> ENVRONtIrAEh1'fAL ti` !,A +.1 <br /> Harlen Knoll PERM IT/SERviCES <br /> #` San Joaquin County Health Department <br /> Environmental Health Division <br /> P.O. Box 2009 <br /> Stockton, CA 95201 <br /> Dear Mr. Knoll: <br /> Re: Qufirteriy Sampling Report, Groundwater ]Monitoring Wells - Stan A'Morri Ford <br /> Dealership - Tracy, California <br /> Murray & Associates is forwarding for your review and consideration the following <br /> �f analytical results stemming from the last (Summer, 1991) round of waicr sampling at the <br /> Stan Morri .Ford Dealership, 104 West 11th Street, Tracy, California. The low <br /> concentration of the purgeable halocarbpn contamination present in:the groundwater <br /> appears to be relatively steady. The persistent presence of traces of these compounds in <br /> MW-2, the up-gradient well, after a period of one year leads me to suspect that the source <br /> of this contamination may be coming from off-site. No volatile aromatic compounds <br /> 4 (BTRE) were in the groundwater at the site indicating that no contamination from the <br /> waste oil tank excavation is reaching the groundwater. Shallow groundwater at the site is <br /> staying at a depth of approximately 11 to 12 feet below the asphalt-covered surface of the <br /> Ford Dealership. Regional groundwater flow direction is still generally to the northeast. <br /> All apparatus for groundwater sampling was brought to the site clean and in serviceable <br /> condition. Following the purging and sampling of each subsequent well, all equipment was <br /> steam-cleaned and washed in a solution of liquinox organic cleaner, rinsed in deionized <br /> water and allowed to.air dry. <br /> Groundwater sampling protocols call for the evacuation of a sufficient volE'me of water <br /> from the well to insure that the sample is coliecttd from water that has been'newly drawn <br /> into the well from the surrounding geologic formation. This effluent water is currently 3 <br /> stored on-site in new DOT 17 E drums. <br /> 2252 Fort Point Drive, Gold River, CA 95670 <br /> (916)635.0839 FAX(916)852-1411 <br /> ;i <br /> if <br />