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�a <br /> l <br /> ERM-W2st, Inc. <br /> Suite 260.1777 Botelho drive^Walnut Cfeek,California 94596.5042 •{415)946-0455•Telefax(415)946-9968 <br /> rte, t: ;ir1• '4r� t''(i:t ati. <br /> October 9, 1991 OCT 1 1 <br /> ENVIR0r,iV1'N I AI_ HEAI.I-H <br /> PRfvll i%SERVICES <br /> Ms. Mary Meays <br /> Public Health Services/Environmental Health <br /> San Joaquin County <br /> 1601 East Hazelton Avenue <br /> Stockton,CA 95201 <br /> Subject: Third Quarter Ground Water Monitoring Report <br /> 1515 West Weber Avenue, Stockton, California <br /> Site Code: 1284 <br /> Dear Mary: <br /> ERM-West, Inc. has completed the third quarter ground water sampling at <br /> 1515 West Weber Avenue. Discussed herein are the purging and sampling <br /> methods and the results of the laboratory analyses. Also included with this <br /> report are the second quarter sampling findings for your reference. <br /> Monitoring wells MW-1 through MW-5 (Figure 1) were purged and <br /> sampled on September 9, 1991 by ERM-West, Inc. personnel. Prior to <br /> purging, the depth to water in the wells was measured by the wetted tape <br /> method (Table 1). The depth othe <br /> s also gallons measured. <br /> of water per weells were <br /> then purged by removing approximately 18 g <br /> After purging was completed, the wells were sampled. Sampling was <br /> accomplished with a pre-cleaned Teflon bailer equipped with a removable <br /> petcock. Water was transfered from the bailer into laboratory-supe <br /> bottles. All samples provided to the laboratory were labeled and sealed into <br /> zip-lock type plastic bags, and then placed on ice in a cooler. <br /> _ Quality Assurance/Quality Control (QA/QC) procedures were followed <br /> during purging and sampling. Prior to work at each well, the equipment <br /> -- - ---- -- - - was cleaned and decontaminated with an Alconox solution followed by a <br /> - clean water rinse. Water from decontamination procedures was retained <br /> in 55-gallon drums and stored on site. Latex type gloves were worn while <br /> handling sampling equipment and sample bottles. Bailer cord was <br /> replaced before sampling at each well locat' <br /> T" <br /> An affiliate of The Environmental Resources Management Group w-th offices worldwide o„oJ <br />