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Wright <br /> Environmental <br /> Services, Inc. <br /> Construction ♦ Engineering ♦ Remediation <br /> February 6, 1998 <br /> Project No 4100-QM <br /> M & M Automotive <br /> 60 E 10th Street <br /> Tracy, CA 95376 <br /> Attention Mr Larry McLean <br /> Re Quarterly Monitoring Well Sampling Report <br /> 60 E. 10th Street, Tracy, CA <br /> Dear Mr McLean, <br /> This report describes the monitoring well sampling at the above referenced site for the quarter ending <br /> December, 1997 Wright Environmental Services, Inc (Wright) was retained to coordinate sampling and <br /> chemical analysis of the site monitoring wells Previous reports are on file with the County of San <br /> Joaquin Public Health Service, Environmental Health Division (PHS-EHD) regarding the removal of <br /> impacted soil discovered during underground fuel storage tank removal Four monitoring wells currently <br /> exist on-site <br /> Field Sampling Procedures <br /> Four monttoring wells were sampled on December 10, 1997 The samplers proceeded to purge well <br /> volumes of groundwater from each well using a submersible electric purge pump (a volume calculation <br /> was done for each well following water level measurements) Purge water was stored on-site in barrels <br /> Measurements of conductivity, pH, and water temperature were obtained between each well volume, and <br /> noted on the attached groundwater sampling information sheets Once the readings stabilized over two <br /> purge volumes, aquifer water was assumed to enter the well Each well was then allowed to recharge to <br /> about 80% of the initial water level prior to sample collection A new disposable bailer was used to <br /> obtain each well groundwater sample Each sample was carefully poured into laboratory prepared <br /> containers leaving no headspace, capped, labeled, logged onto chain-of-custody forms and immediately <br /> placed on ice for shipment to Chromalab Inc in Pleasanton, California (a State Certified Testing Lab) <br /> Table 1 presents the groundwater monitoring well water level data <br /> 4220 Commercial Dr, Suite 5 • Tracy,CA 95376 <br /> 209 833 0758 • Fax 209 832 5152 <br /> wrtght@inreach com Lic #651501 A-B HazMat <br />