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r <br /> IGETTLER - RYAN INC.N <br /> June 29, 1999 <br /> G-R Job 9180137 <br /> Mr Edward C Ralston <br /> Tosco Marketing Company <br /> 1380 Lead Hill Road, Suite 120 <br /> Roseville, California 95661 <br /> RE Second Quarter 1999 Groundwater Monrtonng & Sampling Report <br /> Tosco (Unocal) Service Station #5886 <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 June 1, and 2, 1999, field personnel monitored and sampled twenty wells (MW-1, <br /> MW-2,MW-3,MW-4D,MW-4S,MW-5D,MW-5S,MW-613,MW-6S, MW-7D, MW-7S,MW-8S,MW- <br /> 8I, MW-8D, MW-9S, MW-9I, MW-9D, MW-IOS, MW-101 and MW1OD) at the 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 I A Potentiometric Map is included as Figure I <br /> Groundwater samples were collected from the monitoring 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 /> Deanna L Harding <br /> Project Coordinator vQoJG1AS J <br /> 1 <br /> Dou las Lee ®' 6882 <br /> Senior Geologist, R G No 6882 <br /> Figure 1 Potentiometric Map �r�pF CAL��Q� <br /> Figure 2 Concentration Map <br /> Table 1 Groundwater Momtonng Data and Analytical Results <br /> Table 2 Groundwater Analytical Results - Oxygenate Compounds <br /> Attachments Standard Operating Procedure- Groundwater Sampling <br /> Field Data Sheets <br /> 5886 qml Chain of Custody Document and Laboratory Analytical Reports <br /> 6747 Sierra Court , Suite J - Dublin , California 94568 ( 925) 551 -7555 <br />