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6ETTLER - RYAN INc. January 12, 2001 G-R Job#180137 Mr Edward C Ralston Tosco Marketing Company 1380 Lead Hill Road,Suite 120 Roseville,California 95661 RE Fourth Quarter 2000 Groundwater Monitoring& Sampling Report ' Tosco(Unocal) Service Station#5886 2701 West March Lane Stockton, California Dear Mr Ralston This report documents the quarterly groundwater monitoring and sampling event performed by Gettler-Ryan, Inc (G-R) On November 16 and 17,2000,field personnel monitored and sampled twenty wells(MW 1,MW_ 2,MW-3,MW-4D,MW-4S, MW-5D,MW-5S,MW-6D,MW-6S, MW-7D,MW-7S,MW-8S, MW-8I, MW- 8D, MW-9S,MW-91,MW-9D,MW-IOS,MW-10I, and MW-IOD) at the above referenced site 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 I 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 1 and 2,and a Concentration Map is included as Figure 2 The chain of custody document and laboratory analytical reports are also attached Sincerely, �E?,ED G,&O Deanna L Hardin S t3LA8 ./ [C Project Coordinator No. 6882 Dou J. CP Senior Geologist, R.G No 6882 9�Fp CAl►FQ Figure 1 Potentiometnc Map Figure 2 Concentration Map Table 1 Groundwater Monitoring Data and Analytical Results Table 2 Groundwater Analytical Results-Oxygenate Compounds Attachments Standard Operating Procedure-Groundwater Sampling Field Data Sheets 5MAFW Chain of Custody Document and Laboratory Analytical Reports 6747 Sierra Court , Suite J - Dublin , California 94568 (925 ) 551 -7555