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Wright <br /> Environmental <br /> . Services, Inc. <br /> Construction ♦ Engineering ♦ Remediation <br /> April 26, 1999 <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 <br /> ending March, 1999 Wright Environmental Services, Inc (Wright) was retained to coordinate <br /> l 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 monitor the site <br /> Field Sampling Procedures <br /> Four monitoring wells were sampled on March 29, 1999 The samplers proceeded to purge <br /> well volumes of groundwater from each well using a submersible electric purge pump (a <br /> volume calculation was done for each well following water level measurements) Purge water <br /> was 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 crushed ice f o r <br /> shipment to Chromalab Inc in Pleasanton, California (a State Certified Testing Lab) Table 1 <br /> presents the groundwater monitoring well water level data <br /> do <br /> 67 E 10th Street . Tracy, CA 95376 <br /> 209 833 0758 • Fax 209 332 5152 <br /> wrzght@jnreach corn Lrc #651501 4-B HazWat Page 1 4M. <br />