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GETTLER - RYANINc. <br /> May 19, 2005 <br /> G-R Job#386392 <br /> Mr Dana Thurman <br /> ChevronTexaco Company <br /> P O Box 6012, Room K2236 <br /> San Ramon, CA 94583 <br /> RE- Second Quarter Event of April 19,2005 <br /> Groundwater Monitoring& Sampling Report <br /> Chevron Service Station#9-1848 <br /> 1257 Yosemite Avenue <br /> Manteca, California <br /> Dear Mr Thurman <br /> This report documents the most recent groundwater monitoring and sampling event performed by Gettler- <br /> 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) <br /> Static groundwater levels were measured and the wells were checked for the presence of separate-phase <br /> hydrocarbons Static water level data, groundwater elevations, and separate-phase hydrocarbon thickness (if <br /> any) are presented in the attached 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 <br /> for analyses The field data sheets for this event are attached Analytical results are presented in the table(s) <br /> listed below A Concentration Map is included as Figure 2 The chain of custody document and laboratory <br /> analytical report are also attached <br /> Please call if you have any questions or comments regarding this report Thank you <br /> Se ely, <br /> At G <br /> Deanna L Harding F� <br /> Project Coordinator Lq�j <br /> U3 <br /> No 7504 —i <br /> (J� IDA <br /> Robert A Laui itzen <br /> Senior Geologist,P No 7504 9TF` p <br /> OF CQOF <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 /> Attachments Standard Operating Procedure- Groundwater Sampling <br /> Field Data Sheets <br /> 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 B2 • Petaiuma, CA 94954 • (707) 789-3255 • Fax (707) 789-3218 <br />