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.r <br /> 6ETTLER - RYAN INC. <br /> • Apn1 17, 2000 <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 2000 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 Inc <br /> (G-R) On February 22 and 23,2000, field personnel monitored sixteen wells (U-1 through U-9,UV-1,NP-1- <br /> 22,NP-1-65,NP-1-111,NP-2-22,NP-2-60,and NP-2-116)and sampled fifteen wells(U-1 through U-9,NP-1- <br /> 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 Potentiometnc 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 are also attached The samples were <br /> analyzed by Sequoia Analytical Analytical results are summarized in Tables 1 through 5 A Concentration Map <br /> is included as Figure 2 Chain of custody documents and laboratory analytical reports are also attached <br /> Sincerely, <br /> C�F�ED GAO <br /> Deanna L HardingP► SIE �O <br /> Project Coordinator N G� <br /> No 6676 <br /> Barbara Sieminski Nq <br /> Project Geologist, R G No 6676 �c OF CAI-��O <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 /> 0 Table 4 Groundwater Analytical Results <br /> Table 5 Groundwater Analytical Results <br /> Attachments Standard Operating Procedure - Groundwater Sampling <br /> Field Data Sheets <br /> n,rrva Cham of Custody Document and Laboratory Analytical Reports <br /> 6747 Sierra Court , Suite J * Dublin , California 94568 ( 925) 551 -7555 <br />