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tl Cr <br /> i I--- <br /> E T T L ER — YA N INC. 73s <br /> +. bctober 28, 1998 <br /> Mr Edward C Ralston G-R.Job 9180137 <br /> Tosco Marketing Company <br /> 1380 Lead I111 Road, Suite 120 <br /> Roseville, California 95661 <br /> RE Third Quarter 1998 Groundwater Monitoring & Sampling Report <br /> Tosco (Unocal) Service Station 45886 <br /> 2701 West March Lane <br /> Stockton, California <br /> Dear Mr Ralston <br /> This report documents the quarterly groundwater monitoring and sampling event performed by Gettler- <br /> Ryan, Inc (G-R) On September 1, 1998, field personnel monitored and sampled eleven wells (N W-1, <br /> MW-2, MW-3, MW-4D, MW-4S, MW-5D, MW-5S, MNV-61), MW-6S, Nff-7D, and MW-7S) at the <br /> referenced site <br /> Static groundwater levels were measured and all wells were checked for the presence of separate-phase <br /> hydrocarbons Separate-phase hydrocarbons were not present in the wells Static water level data and <br /> groundwater elevations are summarized in Table 1 A Potentiometric Map is included as Figure 1 <br /> Groundwater samples were collected from the monitonng wells as specified by Standard Operating <br /> Procedure- Groundwater Sampling(attached) The field data sheets are also attached The samples were <br /> analyzed by Sequoia Analytical Analytical results are summarized in Tables 1 and 2, and a Concentration <br /> Map is included as Figure 2 The chain of custody document and laboratory analytical reports are also <br /> attached <br /> cerely, <br /> eanna L Harding \S-SER O G0"a, <br /> Project Coordinator �� EN J Cq9�G'�,� <br /> _ CO <br /> Stephen J Carter * No 5577 <br /> Senior Geologist, R G No 5577 u, <br /> �9T <br /> Figure 1 Potentiometric Map FOP CA0 <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 /> 5886gmi Chain of Custody Document and Laboratory Analytical Reports <br /> 6747 Sierra Court , Suite J - Dublin , California 94568 ( 925 ) 551 - 7555 <br />