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r` <br /> I <br /> • <br /> IGETTLER - RYAN INC. <br /> March 26, 1998 <br /> G-R Job #280045 <br /> Mr Robert A Boust <br /> Unocal - DBGIAMG <br /> 2121 North California Boulevard, Suite 250 <br /> Walnut Creels, 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 ; '' l 7 s^ ✓ s' <br /> Dear Mr Boust <br /> This report documents the quarterly groundwater monitorizigand sampfing event performed by Gettler- Eyan <br /> Inc (G-R) On February 13, and March 9, 1998, field personnel monitored ten wells (U-1 through U-9 <br /> and UV-1) and 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 Potentiometric Maps are included as Figures 1 and <br /> 3, and Concentration 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 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 <br /> Chain of custody documents and laboratory analytical reports are also attached <br /> 4eanna <br /> ely, <br /> DG <br /> �Ol <br /> tiN� C �G'i <br /> Jarding <br /> Protect Manager <br /> * No.5577 <br /> Stephen J Carer 9 <br /> Senior Geologist, R G No 5577 OF CAL%V' <br /> Figure 1 Potentiometric 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 I Groundwater Monitoring Data and Analytical Results <br /> 0 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 <br /> 6747 Sierra Court , Suite J Dublin , California 94568 ( 51 0 ) 551 -7555 <br />