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Ms Margaret Lagono G� = <br /> November 27, 1995 (9347-9013) <br /> A total of five soil samples collected from boring MW-4 and three from B-17 were <br /> submitted to Sequoia Analytical, of Sacramento, California for chemical analysis The suite of <br /> analyses included <br /> • TPH as gasoline by EPA Method 8015 <br /> • BTEX by EPA Method 8020 <br /> The soil sample analytical results are summarized in Table 1 The laboratory report and <br /> chain-of-custody forms are included in Attachment 3 Soil generated during drilling was <br /> temporarily stockpiled onsite on and under plastic sheeting pending characterization for disposal <br /> Stockpile sample analytical results are included in Table 1 <br /> Monitoring Well Installation, Development, and Surveying <br /> Boring MW-4 was completed as a ground water monitoring well using 4-inch-diameter, <br /> schedule 40 PVC casing Boring B-17 was sealed to grade with neat cement Boring logs and <br /> well construction details are included in Attachment 4 On August 21, 1995, Gregg Drilling <br /> developed well MW-4 by surging and pumping approximately 50 gallons of water <br /> • On August 17, 1995, the tap-of-casing elevation of well MW-4 was surveyed by Fugro <br /> personnel using the existing wells as a reference <br /> Ground Water Monitoring and Sampling <br /> On October 10, 1995, Blaine Tech Services, Inc , (Blaine Tech) of San Jose, California, <br /> performed the initial ground water monitoring and sampling of the newly installed well and the <br /> annual monitoring event for all wells The Blaine Tech data report is included as Attachment <br /> 5 Ground water elevation data are summarized in Table 2 Figure 3 is a ground water elevation <br /> hydrograph Figure 4 is a potentiometric surface map of the shallow water-bearing zone beneath <br /> the site on October 10, 1995 Based on the current data, ground water is estimated to flow to <br /> the southwest at an average gradient of approximately 0 001 ft/ft <br /> The samples were submitted under chain-of-custody to NET Labs of Santa Rosa, <br /> California and analyzed for concentrations of TPH as gasoline by EPA Method 8015 and BTEX <br /> by EPA Method 8020 <br /> Analytical results are summarized in Table 3 Figure 5 is a distribution map of benzene <br /> based on the current data The laboratory analytical report and chain-of-custody form are <br /> included as Attachment 6 <br /> 93479013 ARR -3 - <br />