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v 77-11 W right Environmental } Services, Inc. 11'1 Y';ri'G" UO3 Mice � February 6,2003 Construction • Engineering s Remediation 03 MAR 20 PM j: 14 Project No 4090-P Ms Janice Brown c/o Cox&Cox 1593 Arrowhead Drive St Helena California 94574 Re Cox&Cox,Quarterly Monitoring Well Sampling Report 1�'f Site at 595 East l lth Street,Tracy,CA Dear Ms Brown 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 quarterly groundwater monitoring work is in response to a request from the San Joaquin County Public Health Services (PHS EHD) for site groundwater monitoring Monitoring Well Sampling Methods The site was sampled on December 23, 2002 The attached table lists the wells historic and current groundwater level data (see Table 1) The contract sampler proceeded to purge well volumes of groundwate-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 bemeen 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 rhe well Wheri the well recovered to about 80% of the initial water level the sample was collected Purge water was stored on-site in 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 cavitation into the appropriate laboratory prepared sample containers leaving no he-idspace The sample container was then immediately capped labeled under chain-ot-c ustody documentation and placed in a chilled ice chest far shipment to Chromalab Inc in Pleasanton California(a State Certified Testing Laos Groundwater Contour Map and Flow Gradient A groundwater contour map to a known datum was prepared for the data listed in Table 1 (see Figure 1) The groundwater flow direction was northerly under a calculated gradient of 0 002 which is consistent with historic observed trends Overall groundwater levels appear to have declined about 0 2 to 0 3 feet from the previous quarter Well N1W-6 could not be sampled due to a car parked over the well at the time of sampling 67 E i 0th Street , Tracy, CA 95376 209 833 07 53 + Fax 209 832 5 152 wright@inreacn cam Lic T6_)1 X01 A-B Ha.-Mal Pace I websu hap//home inreach comiwright