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93 6ETTLER - RYAN INC. <br /> January 26, 1999 <br /> G-R Job #280045 <br /> Mr Robert A Boust <br /> Unocal - DBG/AMG <br /> 2121 North California Boulevard, Suite 250 <br /> Walnut Creek, California 94596 <br /> RE Fourth Quarter 1998 Groundwater Monitonng & Sampling Report <br /> Former Unocal Service Station #0187 <br /> 437 East Miner 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 November 10, 1998, field personnel monitored ten wells (U-1 through U-9 and UV-1) and <br /> sampled nine wells (U-1 through U-9) 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 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 for both events are also attached The <br /> samples were analyzed by Sequoia Analytical Analytical results are summarized in Tables 1, 2 and 3 A <br /> Concentration Map is included as Figure 2 Chain of custody documents and laboratory analytical reports are <br /> also attached <br /> Si cerely, GFoto <br /> �•y ,�y1�F ���, <br /> eanna C Hav d ng <br /> Protect o rdinator * 110 >it <br /> S n J Carter l'�rf OF CA�1F�� <br /> Senior Geologist, R G No 5577 <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 - Oxygenate Compounds <br /> Table 3 Groundwater Analytical Results <br /> Attachments Standard Operating Procedure - Groundwater Sampling <br /> Field Data Sheets <br /> GIR7 vW Chain of Custody Document and Laboratory Analytical Reports <br /> 6747 Sierra Court , Suite J Dublin , California 94568 ( 925 ) 551 - 7555 <br />