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Wright <br /> Environmental <br /> Services= Inc. <br /> 707 East 11'"Street,Suite 120 <br /> Tracy,CA 95376 <br /> October 24, 2005 <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 monitoring well <br /> f� sampling report for the above referenced site. As you know, several phases of work have been <br /> performed at this site This quarterly groundwater monitoring Work is in response to a request <br /> from the San Joaquin County Environmental Health Department (SJC/EHD) for site quarterly <br /> groundwater monitoring for the dissolved plume <br /> 1.0 Monitoring Well Sampling Methods <br /> A sampling subcontractor sampled the site on September 14, 2005 The attached table(s) lists <br /> the wells historic and current groundwater level data (see Table 1, the site was not sampled due <br /> to soil excavation in the third quarter) The contract sampler proceeded to purge well volumes of <br /> groundwater using a submersible electric purging pump or bailer(a volume calculation was done <br /> for each well following sounding measurements) Conductivity, pH, and water temperature <br /> measurements were obtained between each well volume purge, and these were noted on the <br /> attached groundwater sampling information sheets Once these readings stabilized after two <br /> consecutive purge volumes, aquifer water was assumed to be entering the well When the well <br /> recovered to about 80% of the initial water level, the sample was collected Purge water was <br /> stored on-site in drums The well sampling information streets are attached <br /> Each 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 minimum headspace The sample container was then immediately capped, <br /> labeled under chain-of-custody documentation and placed in a chilled ice chest for shipment to <br /> STUChromalab, Inc in Pleasanton, California (a State Certified Testing Lab) <br /> Page 1 of 4 <br />