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` I C■ <br /> GETTLER - RYAN N <br /> March 1, 2001 <br /> G-R.Job#280054 <br /> Mr Nick Nickerson <br /> Unocal - DBGIAMG <br /> 8788 Elk Grove Boulevard <br /> Building 3, Suite 15 <br /> Elk Grove, California 95624 <br /> RE First Quarter Event of February 8, 2001 <br /> Groundwater Monitoring & Sampling Report <br /> Former Unocal Service Station #2859 <br /> 1665 Pacific Avenue <br /> Stockton, California <br /> Dear Mr Nickerson <br /> This report documents the most recent quarterly groundwater monitoring and sampling event performed by <br /> Gettler-Ryan Inc (G-R) All field work was conducted in accordance with G-R Standard Operating Procedure - <br /> Groundwater Sampling(attached) <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 Dissolved Oxygen Concentrations are summarized in Table <br /> 6 A Potentiometric Map is included as Figure 1 <br /> Groundwater samples were collected from the monitoring wells as specified by G-R 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 through S A Concentration Map <br /> is included as Figure 2 The chairs of custody document and laboratory analytical reports are also attached <br /> cerely, <br /> �R'.Q GEO <br /> Ae-anna <br /> o ct oordinator <br /> No 6332 <br /> Do g s Lee <br /> Sento Ge logist, R G No 6882 dj• a4`r <br /> Figure 1 Potentiometric Map 9TE OF C_p,.�C ` <br /> Figure 2 Concentration Map <br /> Table 1 Groundwater Monitoring Data and Analytical Results <br /> Table 2 Groundwater Analytical Results- Oxygenate Compounds <br /> Table 3 Groundwater Analytical Results <br /> Table 4 Groundwater Analytical Results <br /> Table 5 Groundwater Analytical Results- General Minerals <br /> Table b Dissolved Oxygen Concentrations <br /> Attachments Standard Operating Procedure-Groundwater Sampling <br /> Field Data Sheets <br /> 2859yml Chain of Custody Document and Laboratory Analytical Reports <br /> 6747 Sierra Court , Suite J Dublin , California 94568 ( 925 ) 551 - 7555 <br />