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T � <br /> GETTLER - RYAN INC. <br /> • January 26, 1999 <br /> G-R Job #280054 <br /> Mr Robert A Boust <br /> Unocal - DBG/AMG <br /> 2121 North California Boulevard, Suite 250 <br /> Walnut Creek, California 94596 coo <br /> RE Fourth Quarter 1998 Groundwater Monitoring & Sampling Report <br /> Former Unocal Service Station #2859 <br /> 1665 Pacific Avenue <br /> Stockton, California <br /> Dear Mr Boust <br /> This report documents the quarterly groundwater monitoring and sampling event performed by Gettler-Ryan <br /> Inc (G-R) On December 4, 1998, field personnel monitored and sampled nine wells (MW-1 through MW-9) <br /> 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 in Table 1 Dissolved Oxygen Concentrations are summarized in Table <br /> 5 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 4 A Concentration <br /> Map is included as Figure 2 The chain of custody document and laboratory analytical reports are also attached <br /> c rely, <br /> �e° GEoc <br /> - a L" Harding �coo <br /> Project ordinator <br /> Q <br /> to rJ � No 6728 <br /> J�/&rter <br /> Senior Geologist, R G No 5577 E OF CAti�E�� <br /> Figure 1 Potentiometric Map <br /> Figure 2- Concentration Map <br /> Table 1 Groundwater Monitoring Data and Analytical Results <br /> Table 2 Groundwater Analytical Results <br /> Table 3. Groundwater Analytical Results <br /> Table 4: Groundwater Analytical Results - Oxygenate Compounds <br /> Table 5: Dissolved Oxygen Concentrations <br /> Attachments Standard Operating Procedure -Groundwater Sampling <br /> Field Data Sheets <br /> 2859 gml Chain of Custody Document and Laboratory Analytical Reports <br /> 6747 Sierra Court , Suite J • Dublin , California 94568 ( 925 ) 551 - 7555 <br />