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� 6ETTLER - RYAN INC. <br /> October 15, 1998 <br /> G-R.Job #280045 <br /> Mr. Robert A. Boust <br /> Unocal - DBGIAMG <br /> 2121 North California Boulevard, Suite 250 <br /> Walnut Creek, California 94596 <br /> RE Third Quarter 1998 Groundwater Monitoring & 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 August 17, 1998, field personnel monitored ten wells (U-1 through U-9 and UV-1) and sampled <br /> 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 I A Potentiometric Map is included as Figure I <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 /> Dann <br /> erely, <br /> a L ar ing <br /> Project Coordinator ytQ <br /> No 5577 <br /> Stephen J Carte <br /> Senior Geologist, R G No 5577 <br /> Figure I Potentiometric Map SOF CAL�FDQ, <br /> Figure 2- Concentration Map <br /> Table I 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 /> 0187.qmi Chain of Custody Document and Laboratory Analytical Reports <br /> 6747 Sierra Court , Suite J Dublin , California 94568 ( 925 ) 551 - 7555 <br />