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r 43 6ETTLER - RYAN INC. September 28, 2001 G-R Job#180137 Mr Edward C Ralston Tosco Marketing Company 1380 Lead Hill Road, Suite 120 Roseville, California 95661 RE Third Quarter Event of August 20 and 21,2001 Groundwater Monitonng & Sampling Report Tosca(Unocal)Service Station#5886 2701 West March Lane Stockton,California Dear Mr Ralston This report documents the monthly site visit and the most recent groundwater monitoring and sampling event performed by Gettler-Ryan Inc (G-R)at the referenced site All field work was conducted in accordance with G-R Standard Operating Procedure - Groundwater Sampling (attached) Static groundwater levels were measured and all wells were checked for the presence of separate-phase hydrocarbons Separate-phase hydrocarbons were not present in the wells Static water level data and groundwater elevations are . summarized in Table 1 A Potentiometric Map is included as Figure 1 Groundwater samples were collected from the monitoring wells as specified by Standard Operating Procedure - Groundwater Sampling (attached) The field data sheets are also attached The samples were analyzed by Sequoia Analytical Analytical results are summarized in Tables l and 2 A Concentration Map is included as Figure 2 The chain of custody document and laboratory analytical reports are also attached Sincerely, Deanna L Harding S.�ERED S�GY Project Coordinator No. 6W XDouglaJ di>9 Q- Senior Geologist,R G No 6882 C Figure I Potentiometric Map-Shallow Zone Figure 2 Concentration Map Table I Groundwater Monitoring Data and Analytical Results Table 2 Groundwater Analytical Results-Oxygenate Compounds � Attachments Standard Operating Procedure-Groundwater Sampling t Field Data Sheets 5886gm] Chain of Custody Document and Laboratory Analytical Reports Suite J • Dublin California 94568 925 551 -755 -9 6747 Sierra Court , Sul ( }