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ERM=West Inc. Suite 260• 1777 Botelho Drive•Walnut Creek, California 94596-5042 -(415)946-0455•Telefax (415)946-9968 ' April 14, 1992 ' Ms Mary Meays Public Health Services/Environmental Health ' San Joaquin County 1601 East Hazelton Avenue Stockton, CA 95201 1 Subject First Quarter 1992 Ground Water Monitoring Report Former Tank Site #1 1325 West Weber Avenue, Stockton, California Site Code 1284 ' Dear Mary ERM-West, Inc has completed the first quarter 1992 ground water ,r sampling at 1325 West Weber Avenue, Former Tank Site #1 Discussed herein are the purging and sampling methods and the results of the laboratory analyses Also included as attachments to this report are the second, third and fourth quarter 1991 sampling findings for your reference i Purdn-g and Sam Lg paYG �V, I ' Monitoring well MW- rough MW-5 (Figure 1) were purged and sampled on Marc 92 b ERM-West, Inc personnel Prior to purging, ' the depth to wa er in the we s was measured by the wetted tape method (Table 1) The depth of each well was also measured The wells were then purged by removing approximately 10 to 20 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 transferred from the bailer into laboratory-supplied bottles All samples provided to the laboratory were labeled and sealed into Zip-Lack® type plastic bags, and then placed on ice in a cooler ' Quality Assurance/Quality Control (QA/QC) rocedures 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 TM An affiliate of The Environmental Resources Management Group with offices worldwide p