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� 6ETTLER - RYAN INC. <br /> • December 26, 2000 <br /> G-R Job#280054 <br /> Mr Nick Nickerson <br /> Unocal - DBG/AMG <br /> 8788 Elk Grove Boulevard <br /> Building 3, Suite 15 <br /> Elk Grove, California 95624 <br /> RE Fourth Quarter 2000 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 quarterly groundwater monitoring and sampling event performed by Gettler-Ryan <br /> Inc (G-R) On November 13,2000,field personnel monitored and sampled eleven wells(MW-1 through MW- <br /> 10 and NP-1) at the above 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 to Table 1 Dissolved Oxygen Concentrations are summarized in Table <br /> 6 A Potentiometnc 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 5 A Concentration Map <br /> is included as Figure 2 The chain of custody document and laboratory analytical reports are also attached <br /> Sincerely, "% <br /> 4 DJ. <br /> eanna L Harding � �. J► <br /> Prof t Coordinator 52 co �9 <br /> No.5577 <br /> tephe J Carte <br /> Senior Geologist, R G No. 5577 <br /> Figure 1 Potentiometric Map OFC <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 6 Dissolved Oxygen Concentrations <br /> Attachments Standard Operating Procedure-Groundwater Sampling <br /> Field Data Sheets <br /> 2859,gW Chain of Custody Document and Laboratory Analytical Reports <br /> 6747 Sierra Court , Suite J • Dublin , California 94568 ( 925) 551 - 7555 <br />