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6ETTLER - RYAN INC. June 29, 1999 G-R Job #180137 Mr Edward C Ralston Tosco Marketing Company 13 80 Lead Hill Road, Suite 120 FILE C Roseville, California 95661 RE Second Quarter 1999 Groundwater Monitoring & Sampling Report Tosco (Unocal) Service Station 95886 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 June 1, and 2, 1999, field personnel monitored and sampled twenty wells (MW-1, MW-2, MW-3,MW-4D,MW-4S,MW-5D,MW-5S,MW-613, MW-6S, MW-7D,1VI-w-7S, MW-8S,MW- 8I, MW-813, MW-9S, MW-9I, MW-9D, MW-10S, MW-101 and MW 1013) at the 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 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 I and 2, and a Concentration Map is included as Figure 2 The chain of custody document and laboratory analytical reports are also attached cerely, Deanna L Harding Ela p� Project Coordinator Dou las Lee No. 6882 Senior Geologist, R G No 6882 Figure 1 Potentioinetric Map �r9r�pF CA Figure 2 Concentration Map 0 Table 1 Groundwater Monitoring Data and Analytical Results Table 2 Groundwater Analytical Results - Oxygcnate Compounds Attaclunents Standard Operating Procedure-Groundwater Sampling Field Data Sheets 5886 qmi Chain of Custody Document and Laboratory Analytical Reports 6747 Sierra Court , Suite J - Dublin , California 94568 (925 ) 551 - 7555