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ERM-West, Inc. Suite 260- 1777 Botelho Drive •Walnut Creek, California 94596-5042 • (415) 946-0455 • Telefax (415) 946-9968 January 15, 1992 � ¢j R rn; E D Ms Mary Meays Public Health Services/Environmental Health JAN i � San Joaquin County' r_Wigt.t) WENTAL MEALTH 1601 East Hazelton Avenue pERMITISERUES Stockton, CA 95201 Subject Fourth Quarter Ground Water Monitoring Report 1515 West Weber Avenue, Stockton, California Site Code: 1284 Dear Mary ERM-West, Inc. has completed the fourth quarter ground water sampling at 1515 West Weber Avenue Discussed herein are the purging and sampling methods and the results of the laboratory analyses. Also included with this report are the second and third quarter sampling findings for your reference Monitoring wells MW-1 through MW-5 (Figure 1) were purged and sampled on December 23, 1991 by ERM-West, Inc personnel. Prior to purging, the depth to water in the wells was measured by the wetted tape method (Table 1) The depth of the well was also measured. The wells were then purged by removing approximately 10 to 15 gallons of water per well. The monitoring well purge records are attached After purging was completed, the wells were sampled Sampling was accomplished with a pre-cleaned Teflon® bailer equipped with a removable petcock Water was transfered from the bailer into laboratory-supplied bottles All samples provided to the laboratory were labeled and sealed into zip-lock type plastic bags, and then placed on ice in a cooler. Quality Assurance/Quality Control (QA/QC) procedures were followed during purging and sampling. Prior to work at each well, the equipment was cleaned and decontaminated with an Alconox solution followed by a clean water rinse. Water from decontamination procedures was retained in 55-gallon drums and stored on site. Latex type gloves were worn while MW An affiliate of The Environmental Resources Management Group with offices worldwide L14,8