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ERM-West, Inc <br /> 1777 Botelho Drive <br /> Suite 260 <br /> April 15, 1993 Walnut Creek, CA 94596 <br /> (510) 946-0455 <br /> APR 15 1993 (510)946-9968(Fax) <br /> ENVIRONMENTAL HEALTH <br /> ' Ms Mary Meays PERMIT/SERVICES <br /> Public Health Services/Environmental <br /> Health <br /> ' San Joaquin County <br /> 445 North San Joaquin <br /> Stockton, California 95201 0 <br />' Subject First Quarter 1993 Ground Water ERM <br /> Monitoring Report Former Tank <br />' Sites #1 and #2 1325 West Weber <br /> Avenue, Stockton, California <br />' Dear Mary <br /> ERM-West, Inc (ERM) has completed the First Quarter 1993 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 /> Pur m* z and h9mp ny <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 March <br /> 5, 1995 by ERM personnel Prior to purging activities, the depth to water in <br />' each of the wells was measured by the wetted tape method (Table 1); ERM <br /> obtained the water level measurements for all of the wells within one hour <br /> The total depth of each well was also measured The wells were then purged <br /> by removing at least three casing volumes of water per well The monitoring <br /> 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-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 was <br /> cleaned and decontaminated with an Alconox® solution followed by a de- <br /> ionized water rinse Water from decontamination procedures was retained <br /> V,%k *0 <br /> A Member of the Environmental <br /> Resources Management Group <br />