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Wribht <br /> 1 Environmental <br /> . W"I Services, Inc. , ; <br /> Construction ♦ Engineering ♦ Remediation <br /> f <br /> February 21 , 2001 <br /> Project No 4090-P <br /> Ms Janice Brown <br /> c/o Cox & Cox <br /> 1593 Arrowhead Drive <br /> St Helena, California 94574 <br /> Re Cox & Cox, Quarterly Monitoring Well Sampling Report <br /> Site at 595 East 11th Street, Tracy, CA <br /> Dear Ms Brown, <br /> Wright Environmental Services, Inc (Wright) has prepared this quarterly report for the <br /> above referenced site As you know, several phases of work have been performed at this site <br /> This work is in response to a request from the San Joaquin County Public Health Services (PHS <br /> . EHD) for site monitoring <br /> Monitoring Well Sampling Methods <br /> The site was sampled on January 17, 2001 The attached table lists the wells historic and <br /> current groundwater level data (see Table 1) <br /> The sampler proceeded to purge well volumes of groundwater using a submersible electric <br /> purging pump (a volume calculation was done for each well following sounding measurements) <br /> Conductivity, pH, and water temperature readings were obtained between each well volume <br /> purge, and these were noted on the attached groundwater sampling information sheets Once <br /> these readings stabilized after two consecutive purge volumes, aquifer water is assumed to be <br /> entering the well When the well recovered to about 80% of the initial water level, the sample <br /> was collected Purge water was stored on-site in drums The well sampling information sheets <br /> are attached <br /> The groundwater sample was collected with a new disposable bailer The groundwater sample <br /> was then poured with minimum cavitation into the appropriate, laboratory prepared sample <br /> containers leaving no headspace The sample container was then immediately capped, labeled and <br /> placed in a chilled ice chest for shipment to Chromalab, Inc in Pleasanton, California (a State <br /> Certified Testing Lab) under chain-of-custody documentation <br /> • <br /> 67 E 10th Street . Tracy,CA 95376 <br /> 209 833 0758 . Fax 209 832 5152 <br /> wright@inreach com Lie #651501 A-B Ha_Mat Page 1 <br /> websit hup//home inreach com/wright <br />