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c V/ <br /> INC. <br /> ig ETTLER '_ YAN <br /> June 3, 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 Second Quarter 1999 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 development and quarterly groundwater monitoring and sampling events performed <br /> by Gettler-Ryan Inc (G-R) On May 7, 1999, field personnel monitored sixteen wells (U-1 through U-9, <br /> UV-1, NP-1-22, NP-1-65, NP-1-111, NP-2-22, NP-2-60, and NP-2-116) and sampled fifteen wells (U-1 <br /> through U-9, NP-1-22, NP-1-65, NP-1-111, NP-2-22, NP-2-60, and NP-2-116) 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 through 5 A <br /> Concentration Map is included as Figure 2 Chain of custody documents and laboratory analytical reports <br /> are also attached <br /> Z <br /> rely, <br /> L az in � <br /> FRED CFO <br /> Project Coordinator <br /> 2 Co <br /> Stephen J Carter <br /> Senior Geologist, R G No 5577 * No.5577 <br /> 6747 Sierra Court , Suite J Dublin , California 94568 ( 925 ) 551 - 7555 <br />