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F <br /> 6ETTLER - RYAN INC. <br /> • <br /> June 4, 2003 <br /> G-R.Job #180238 <br /> Mr Edward C Ralston <br /> ConocoPhillips <br /> 76 Broadway Avenue <br /> Sacramento, California 95818 <br /> RE Second Quarter Event of April 28, 2003 <br /> Groundwater Monitoring& Sampling Report <br /> Former Tosco(Unocal) Service Station #4409 <br /> 1502 North El Dorado Street <br /> Stockton, California <br /> Dear Mr Ralston <br /> This report documents the most recent groundwater monitoring and sampling event performed by Gettler-Ryan Inc (G- <br /> R) at the referenced site All field work was conducted in accordance with G-R Standard Operating Procedure - <br /> Groundwater Sampling (attached) A Joint groundwater monitoring event was performed with Arco Service Station <br /> #4932, located at 16 East Harding Way, Stockton, California <br /> Static groundwater levels were measured and all wells at the referenced site were checked for the presence of separate- <br /> phase hydrocarbons Separate-phase hydrocarbons were not present in any of the wells Static water level data and <br /> groundwater elevations are summarized in Table I <br /> Groundwater sampics AA ere collected from the monitoring wells and submitted to a state certified laboratory for analyses <br /> The field data sheets for this event are attached Analytical results are presented in the table(s)listed below The chain <br /> of custody document and laboratory analytical reports are also attached <br /> S cerely, <br /> Deanna L Harding <br /> Project Coordinator <br /> Table l Groundwater Monitoring Data and Analytical Results <br /> Table 2 Groundwater Analytical Results-Oxygenate Compounds <br /> Table 3 Joint Groundwater Monitoring Data and Analytical Results-Arco#4932 <br /> Attachments Standard Operating Procedure-Groundwater Sampling <br /> Field Data Sheets <br /> 4409 q" Chain of Custody Document and laboratory Analytical Reports <br /> I• <br /> 6747 Sierra Court , Suite J • Dublin , California 94568 ( 925 ) 551 - 7555 <br />