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� 6ETTLER - RyAiv INc. <br /> ,h October 29, 2003 <br /> G-R Job#180138 <br /> Mr Edward C Ralston <br /> ConocoPhillips <br /> 76 Broadway Avenue <br /> Sacramento, California 95818 <br /> RE- Third Quarter Event of September 24 and 25,2003 <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 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 /> ` l/- C <br /> r <br /> Deanna L Harding <br /> Project Coordinator <br /> Robert C Mallory NoFV <br /> Registered Geologist,No 7285s`f=� <br /> 4F L <br /> Figure 1 Potentiometnc Map GA <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 /> 6991 qml Chain of Custody Document and Laboratory Analytical Reports <br /> 6747 Sierra Court, Suite J - Dublin, CA 94568 - (925) 551-7555 • Fax (925) 551-7888 <br /> 3140 Gold Camp Drive, Suite 170 - Rancho Cordova, CA 95670 - (916) 631-1300 - Fax (916) 631-1317 <br /> 1364 N McDowell Blvd , Suite 132 - Petaluma, CA 94954 - (707) 789-3255 - Fax (707) 789-3218 <br />