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C <br /> 1117 Lone Palm Avenue Suite B <br /> Modesto California 95351 <br /> www atc-envi ro conn <br /> 209 579 2221 <br /> s s,' Fax 209 579 2225 <br /> C A S S O C I A T E S I N C t rA ' Ai� T1 <br /> rrr- <br /> fin t^. <br /> 3- (� <br /> August 31, 2000 <br /> 54 90254 0006 <br /> Mr Jeff Wong <br /> San Joaquin County <br /> Public Health Services, EHD <br /> 304 E Weber Avenue, 3rd Floor <br /> Stockton, CA 95202 <br /> Subject Groundwater Monitoring and Sampling, at 2403 West Navy Drive, Stockton, <br /> California <br /> • Dear Mr Wong <br /> This letter report summarizes fieldwork completed by ATC Associates Inc (ATC) on behalf of <br /> C&R International Sales for property located at 2403 West Navy Drive, Stockton, California <br /> This work was performed in conjunction with the property transaction The purpose of the <br /> sampling was to evaluate whether methyl tertiary butyl ether (MTBE) is present in groundwater <br /> beneath the site <br /> In brief, ATC sampled wells MW1 and MW2 at the site Historically, these two wells have <br /> contained the highest concentrations of petroleum hydrocarbons among the seven on-site <br /> monitoring wells <br /> GROUNDWATER MONITORING AND SAMPLING <br /> On May 16, 2000, groundwater samples were collected by ATC from monitoring wells MW1, <br /> and MW2 Groundwater samples were collected from the monitoring wells after stabilization of <br /> pH, electrical conductivity (EC), and temperature All wells monitored were purged and sampled <br /> according to in accordance with ATC's Quality Assurance/Quality Control PIan on file with the <br /> PHS/EHD A minimum of approximately eight casing volumes of water was removed from each <br /> well A dedicated disposable bailer was used to collect each water sample Field parameters and <br /> purged volumes are shown on well purge logs included in Attachment I <br />