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Wright <br /> Environmental <br /> 40 Services, Inc. <br /> M 110 26 <br /> January 10, 1997 <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 /> 4th Quarter, 1996 <br /> 60 E 10th Street, Tracy, CA <br /> Dear Mr McLean, <br /> This report describes the sampling of monitoring wells at the above referenced site for the last <br /> quarter ending December, 1996 Wright Environmental Services, Inc (Wright) was retained <br /> to coordinate sampling and chemical analysis of the site monitoring wells Previous reports are <br /> on file with the County of San Joaquin Public Health Service, Environmental Health Division <br /> (PHS-EHD) regarding the removal of impacted soil discovered during underground fuel storage <br /> tank removal Three monitoring wells currently exist on-site <br /> Field Sampling Procedures <br /> Three monitoring wells were sampled on December 19, 1996 The samplers proceeded to <br /> purge well volumes of groundwater from each well using a submersible electric purge pump (a <br /> calculation was done for each well following sounding measurements) Purge water was stored <br /> on-site in barrels Measurements of conductivity, pH, and water temperature were obtained <br /> between each well volume, and noted on the attached groundwater sampling information sheets <br /> Once the readings stabilized over two purge volumes, aquifer water was assumed to enter the <br /> well Each well was then allowed to recharge to about 80% of the initial water level prior to <br /> sample collection <br /> A new disposable bailer was used to obtain each well groundwater sample Each sample was <br /> carefully poured into laboratory prepared containers leaving no headspace, capped, labeled, <br /> logged onto chain-of-custody forms and immediately placed on ice for shipment to Priority <br /> Environmental Laboratories Inc in Milpitas, California (a State Certified Testing Lab) Table <br /> 1 presents the groundwater monitoring well data <br /> i <br /> M & M Automotive Project No 4100-QM Page 1 <br /> 4220 Commercial Dr #5 e Tracy, California 95376 <br /> Telephone (209) 833-0758 0 Fax (209) 832-5152 <br />