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4zi 6ETTLER - RYAN INC. <br /> May 7, 2003 <br /> G-R Job#180138 <br /> Mr Edward C Ralston <br /> ConocoPhillips <br /> 76 Broadway Avenue <br /> Sacramento, California 95818 <br /> RE: First Quarter Event of March 29 and 30, 2003 <br /> Groundwater Monitoring& Sampling Report <br /> Former Tosco(Unocal) Service Station#6981 <br /> 4707 Pacific Avenue <br /> Stockton,California I <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 Potentiometric 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 <br /> D GO <br /> Ce <br /> O �o <br /> RobertC Mallory * N0 7(g„ro,,, <br /> Registered Geologist,No 7285 v' Exp <br /> Figure 1 Potentiometnc Ma OFCA1-�F� <br /> g p <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 qml Chain of Custody Document and Laboratory Analytical Reports <br /> 6747 Sierra Court , Suite , • Dublin , California 94568 ( 925 ) 551 - 7555 <br />