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r it <br /> dk <br /> # Wright <br /> F <br /> :�" Environmental o {� n <br /> " Services, Inc. <br /> Construction ♦ Engmeermg • Remediation AUG 0 3 2004 <br /> ENVIRONMENT HEALTH <br /> PERMIT/SERVICES <br /> June 30,2004 <br /> Protect 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 sampling report for the <br /> above referenced site As you know, several phases of work have been performed at this site This quarterly <br /> groundwater monitoring work is in response to a request from the San Joaquin County Environmental Health <br /> �! Department(SJC/EHD)for site quarterly groundwater monitoring for the dissolved plume <br /> Monitoring Well Sampling Methods <br /> A sampling subcontractor sampled the site monitoring wells on June 1, 2004 Wells MW-3 and MW-9 were not <br /> sampled as these wells had been removed for the soil enavatnon work <br /> The attached table(s) lists the wells historic and current groundwater level data(see Table 1) The contract sampler <br /> proceeded to purge well volumes of groundwater using a submersible electric purging pump or bailer (a volume <br /> calculation was done 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 attached groundwater <br /> sampling information sheets Once these readings stabilized after two consecutive purge volumes, aquifer water was <br /> assumed to be entering the well When the well recovered to about 80% of the initial water level, the sample was <br /> collected Well purge water was stored on-site in drums The contractor well sampling information sheets are <br /> attached <br /> Each groundwater sample was collected with a new disposable bailer The groundwater sample was then poured <br /> with minimum cavitation into the appropriate, laboratory prepared sample containers leaving minimum headspace <br /> The sample container was then immediately capped, labeled under chain-of-custody documentation and placed in a <br /> chilled ice chest on crushed ice for shipment to STL/Chromalab, Inc in Pleasanton, California (a State Certified <br /> Testing Lab) <br /> i <br /> 67 E 10th Street ♦ Tracy,CA 95376 <br /> 209 833 0758 ♦ Fax 209 832 5152 <br /> wright@inreach com Lic #651501 rt-B HazMat Page I of 4 A <br /> websit http 11home inreach com/wright <br />