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GETTLER - RYAN IN C. __ January 27, 1999 . Mr Edward C Ralston G-R Job 9180137 Tosco Marketing Company 1380 Lead Hill Road, Suite 120 Roseville, California 95661 RE Fourth Quarter 1998 Groundwater Morutonng & Sampling Report Tosco (Unocal) Service Station 95886 2701 West March Lane Stockton, California Dear Mr Ralston This report documents the quarterly groundwater morutoring and sampling event performed by Gettler- Ryan, Inc (G-R) On December 3, 1998, field personnel monitored and sampled eleven wells (MW-1, NfW- 21 MW-3, MNV-4D, %BV-4S, MW-5D, MW-5S, MW-6D, MW-6S, MW-7D, and NIW-7S) at the referenced site Static groundwater le`,els 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.Potentiometnc 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 summanzed 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, ��Eo G eo<0C anna L Hardtn9 No 6728 Project ordi for �r Step J Carter F p C11��E4 Se r Geologist, R G No 5577 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 5885gm1 Chain of Custody Document and Laboratory Analytical Reports 6747 Sierra Court , Suite J Dublin , California 94568 ( 925 ) 551 - 7555