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• Wright <br /> Environmental <br /> Services, Inc. r;- <br /> Project No 4233-3 <br /> November 14,2003 Construction • Engineering . Remediation 03 �0� PM 3. 02 <br /> Trust of Mary Gardella <br /> Go Ms Witufred Alexander <br /> 5252',d Street <br /> Santa Cruz, CA 95060 <br /> Re: Quarterly Groundwater Monitoring Report, Third Quarter <br /> Former Stefanos Gas Station, 1419 East Charter Way <br /> Stockton, CA, PHS EHD Site Code 1530 <br /> Dear Ms Alexender, <br /> Wright Environmental Services, Inc (Wnght) the work for the Quarterly Groundwater <br /> Monitoring Report at the above referenced site located at 1419 East Charter Way, Stockton, <br /> California (see Figure 1) The purpose of this work is to provide quarterly groundwater <br /> monitoring as required by the San Joaquin County Environmental Health Division (SJC <br /> EHD) <br /> Field Methods <br /> Groundwater Monitoring Well Sampling <br /> The wells were sampled on September 23, 2003 Each monitoring well was purged using <br /> calculated well volumes based upon the depth to water in each casing Depth to <br /> groundwater measurements were made to the nearest one-one hundredth of one foot, and <br /> also checked for the presence of separate please product As each purge volume is removed, <br /> measurements of pH, electrical conductivity and temperature were taken until these <br /> parameters stabilize, which is interpreted to be aquifer water entering the casing The well <br /> was allowed to recover to 80% of the iTuttally measured water level, and then samples were <br /> collected The groundwater sample was carefully collected with a clean bailer and poured <br /> with minimum cavitation into the appropriate laboratory prepared container Each water <br /> sample was labeled, Iogged onto a chain-of-custody form, and placed in a chilled ice chest <br /> on crushed ice Upon completion of well sampling, the well was closed and locked and the <br /> sampler moved to the next well <br /> Groundwater Conditions <br /> Groundwater occurred at depths of about 41 to 42 feet below the surface (see Table 1) <br /> Groundwater levels declined about 15 feet since the Iast monitoring An east southeasterly <br /> groundwater flow direction was plotted from the monitoring well data under a gradient of <br /> about 0 007 (see Table 1 and Figure 1) <br /> 67 E 10th Street o Tracy, CA 95376 Pace 1 <br /> 209 833 0758 o Fax 209 832 5152 <br /> wnght@inreach com Lic #651501 A-B HazMat C21 q <br /> we6set http 11wrightenvironmentalservices com <br />