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f <br /> V Ya <br /> GETTLER - RYAN NC. <br /> �. <br /> February 4,2003 <br /> G-R Job#180138 <br /> Mr Edward C Ralston <br /> ConocoPhillips <br /> 76 Broadway <br /> Sacramento,California 95818 <br /> RE: Fourth Quarter Event of December 30 and 31,2002 <br /> Groundwater Monitoring& Sampling Report <br /> Former Tosco(Unocal) Service Station#6981 <br /> 4707 Pacific Avenue <br /> Stockton,California <br /> Dear Mr Ralston <br /> This report documents the most recent groundwater monitoring and sampling event performed by Gettler-Ryan Inc <br /> (G-R)at the referenced site All field work was conducted in accordance with G-R Standard Operating Procedure- <br /> Groundwater Sampling(attached) <br /> Static groundwater levels were measured and all wells were checked for the presence of separate-phase <br /> hydrocarbons Separate-phase hydrocarbons were not present in the wells Static water level data and groundwater <br /> elevations are summarized in Table 1 A Potentiometnc Map is included as Figure 1 <br /> Groundwater samples were collected from the monitoring wells and submitted to a state certified laboratory for <br /> analyses The field data sheets for this event are attached Analytical results are presented in the table(s)listed <br /> below A Concentration Map is included as Figure 2 The chain of custody document and laboratory analytical <br /> report are also attached <br /> Sincerely, <br /> Deanna L Harding <br /> Project Coordinator .SER C 1G�E4� <br /> C 'SCOC�J'J` <br /> o <br /> * Ce. No 7285 �r <br /> Exp o O ?� <br /> Robert C Mallory <br /> Registered Geologist,No 7285 9�OF CAS-�F <br /> Figure 1 Potentiometric Map <br /> Figure 2 Concentration Map <br /> Table 1 Groundwater Monitoring Data and Analytical Results <br /> Table 2 Groundwater Analytical Results-Oxygenate Compounds <br /> Table 3 Groundwater Analytical Results <br /> . Attachments Standard Operating Procedure-Groundwater Sampling <br /> Field Data Sheets <br /> 6981 qm1 Chain of Custody Document and Laboratory Analytical Reports <br /> 6747 Sierra Court , Suite J • Dublin , California 94568 (925) 551 - 75 -55 <br />