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Wright <br /> Environmental <br /> •5 t <br /> SeCV1CeS, enc. , , � , �1 q <br /> 4 <br /> Construction ♦ Engineering ♦ Remediation <br /> July 20, 1998 <br /> Project No 4100-OM <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 <br /> ending March, 1998 Wright Environmental Services, Inc (Wright) was retained to coordinate <br /> sampling and chemical analysis of the site monitoring wells Previous reports are on file with <br /> the County of San Joaquin Public Health Service, Environmental Health Division (PHS-EHD) <br /> regarding the removal of impacted soil discovered during underground fuel storage tank <br /> removal Four monitoring wells currently exist on-site <br /> Field Sampling Procedures <br /> Four monitoring wells were sampled on June 30, 1998 The samplers proceeded to purge well <br /> volumes of groundwater from each well using a submersible electric purge pump (a volume <br /> calculation was done for each well following water level measurements) Purge water was <br /> stored on-site in barrels Measurements of conductivity, pH, and water temperature were <br /> obtained between each well volume, and noted on the attached groundwater sampling information <br /> sheets Once the readings stabilized over two purge volumes, aquifer water was assumed to <br /> enter the well Each well was then allowed to recharge to about 80% of the initial water level <br /> prior to sample collection A new disposable bailer was used to obtain each well groundwater <br /> sample <br /> Each sample was carefully poured into laboratory prepared containers leaving no headspace, <br /> capped, labeled, logged onto chain-of-custody forms and immediately placed on ice for shipment <br /> to Chromalab Inc in Pleasanton, California (a State Certified Testing Lab) Table 1 presents <br /> the groundwater monitoring well water level data <br /> 4220 Commercial Dr, Suite 5 . Tracy,CA 95376 <br /> 209 833 0758 . Fax 209 832 5152 Page 1 If <br /> wrtghtCtnreach com Lcc #651501 4-B HaWat �� <br />