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L ERM—West,Inc <br /> 1777 Botelho Drive <br /> Suite 260 <br /> January 14, 1993 Walnut Creek, CA 94596 <br /> (510)946-0455 <br /> (510)946-9968(Fax) <br /> �s <br /> Ms Mary Meays <br /> Public Health Services/Environmental <br /> Health <br /> San Joaquin County JAN 1 5 �gg3 <br /> 445 North San Joaquin ENVIRONMENTAL HEALTH <br /> Stockton, California 95203 PERMlT/SERVICE <br /> Subject Fourth Quarter 1992 Ground Water <br /> Monitoring Report Former Tank <br /> Sites #1 and #2 1325 West Weber <br /> Avenue, Stockton, California <br /> Dear Mary ERM <br /> ERM-West, Inc (ERM) has completed the Fourth Quarter 1992 ground water <br /> sampling at 1325 West Weber Avenue, Former Tank Sites #1 and #2 (Figure <br /> 1) Discussed herein are the purging and sampling methods and the results of <br /> the laboratory analyses For your reference, also included in the data tables of <br /> this report are summaries of sampling findings from previous quarters <br /> Puig-ingy <br /> lin <br /> Monitoring wells MW-1 through MW-5 (Former Tank Site #1) and MW-1A <br /> through MW-4A (Former Tank Site #2) were purged and sampled on <br /> December S, 1992 by ERM personnel Prior to purging activities, the depth to <br /> water in each of the wells was measured by the wetted tape method (Table 1), <br /> ERM obtained the water level measurements for all of the wells within one <br /> hour The total depth of each well was also measured The wells were then <br /> purged by removing at least three casing volumes of water per well The <br /> monitoring well purge records are attached <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 transferred from the bailer into appropriate laboratory- <br /> supplied containers All samples provided to the laboratory were labeled and <br /> sealed into Zip-LockO 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 was <br /> cleaned and decontaminated with an Alconox a solution followed by a de- <br /> 40 ionized water rinse Water from decontamination procedures was retained <br /> A MEMBER OF THE ENVIRONMENTAL RESOURCES MANAGEMENT GROUP <br />