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6ETTLER - RYAN NC. <br /> March 26, 1998 <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 First Quarter 1998 Groundwater Monitoring & Sampling Report <br /> Former Unocal Service Station #0187 <br /> 437 East Miner Avenue <br /> Stockton, California <br /> Dear Mr Boust 1 <br /> This report documents the quarterly groundwater monitoring and sampling event performed by Gettler-Ryan <br /> Inc (G-R) On February 13, and March 9, l , fieldmonitored <br /> referenced site (U-1 through U-9 <br /> and UV-1) and sampled nine wells (U-1 through ) at the above <br /> Static groundwater levels were measured and all wells were checked for the presence of separate-phase <br /> hydrocarbons Separate-phase hydrocarbons were not o ent omet iresent in c1Mapsl aresdata and <br /> ncludedtatic tas Fer it ures I and <br /> • ;roundwater elevations are summarized in Tab <br /> le 3, and Conceatration Maps are included as Figures 2 and 4 <br /> Groundwater samples were collected from the monitoring wells as specified by G-R Standard Operating <br /> Procedure - Groundwater Sampling (attached) The <br /> Analytical results aresummarized in Tables <br /> sheets data for <br /> etl �l2 and The <br /> 3 <br /> samples were analyzed by Sequoia Analytical yical <br /> Chain of custody documents and laboratory analytical reports are also attached <br /> Sin rely <br /> , �`S.�E��D G <br /> J <br /> eana arding co 9 <br /> Project Manager <br /> No.x577 <br /> Stephen J Car er ��9T <br /> Senior Geologist, R G No 5577 F4F CA1.1�O <br /> Figure 1 Potentiom&tric Map - February 13, 1998 <br /> Figure 2 Potentiometric Map - March 9, 1998 <br /> Figure 3 Concentration Map - February 13, 1998 <br /> Figure 4 Concentration Map - March 9, 1998 <br /> Table 1 Groundwater Monitoring Data and Analytical <br /> 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 /> Chain of Custody Document and Laboratory Analytical Reports 7 5 5 5 <br /> 6747 Sierra Court , Suite J Dublin , California 94568 ( 5 10 ) 551 - <br />