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Wright , i Environmental Services, Inc. 00 Construction ♦ Engineering ♦ Remediation p August 18,2000 Cox and Cox P O Box 1046 Tracy, California 95378 Project No 4090-P Re Quarterly Monitoring Well Sampling Report Site at 595 East IIth Street,Tracy, CA Dear Mr Cox, Wright Environmental Services, Inc (Wright) has prepared this quarterly report for the above referenced site As you know, several phases of work have been performed at this site This work is m response to a request from the San Joaquin County Public Health Services(PHS EHD) for site monitoring Monitoring Well Sampling Methods The site was sampled on July 19, 2000 The following table briefly describes the wells historic and current groundwater level data and chemical data The sampler proceeded to purge well volumes of groundwater using a submersible electric purging pump (a volume calculation was done for each well following sounding measurements) Conductivity, pH, and water temperature readings were obtained between each well volume purge, and these were noted on the attached groundwater sampling information sheets Once these readings stabilized after two consecutive purge volumes, aquifer water is assumed to be entering the well When the well recovered to about 80%of the initial water level, the sample was collected Purge water was stored on-site m drums The well sampling information sheets are attached The groundwater sample was collected with a new disposable bailer The groundwater sample was then poured with minimum cavitations into the appropriate, laboratory prepared sample containers leaving no headspace The sample container was then immediately capped, labeled and placed in a chilled ice chest for shipment to Chromalab, Inc in Pleasanton, California(a State Certified Testing Lab)under chain-of-custody documentation 67 E IOth Street . Tracy, CA 95376 209 833 0758 • Fax 209 832 5152 wrtght@inreach cam Lic #651501 A-B HazMat ^� websit http//home inreach com/wright