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Y <br /> 6ETTLER - RYAN INC. <br /> • <br /> August 27, 2003 <br /> G-R Job#180238 <br /> Mr Edward C Ralston <br /> ConocoPhillips <br /> 76 Broadway Avenue <br /> Sacramento, California 95818 <br /> RE Third Quarter Event of July 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 well development and the most recent groundwater monitoring and sampling event performed <br /> by Gettler-Ryan Inc (G-R) at the referenced site All field work was conducted in accordance with G-R Standard <br /> Operating Procedure-Groundwater Sampling(attached) A Joint groundwater monitoring event was conducted with <br /> Arco Service Station#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 welts Static water level data and <br /> groundwater elevations are summarized in Table 1 <br /> Groundwater samples were 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 /> Sincerely, <br /> l <br /> Deanna L Harden <br /> Project Coordinator <br /> Table 1 Groundwater Monitoring Data and Analytical Results <br /> Table 2 Groundwater Analytical Resuits- Oxygenate Compounds <br /> Table 3 Joint Groundwater Monitoring Data and Analytical Results-Arco 94932 <br /> Attachments Standard Operating Procedure-Groundwater Sampling <br /> Field Data Sheets <br /> 4409 girl Chain of Custody Document and Laboratory Analytical Reports <br /> 46 <br /> 6747 Sierra Court , Suite J - Dublin , California 94568 ( 925 ) 551 -7555 <br />