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by/1Gi7r 16:44 a,,'GSI—SACTO - 12094640135 Pie <br /> Work Plea For Soil Boring and Monitoring Well lnetallation -Unocal Station No, 6981 <br /> September 12, 1997 <br /> space around the screen will be filled with Lonestar #3 graded sand, followed by <br /> hydrated bentonite. Neat cement containing approximately 5% bentonite powder will <br /> be placed above the bentonite transition seal, the neat cement will be placed with a <br /> tremie pipe and pump. Proposed well construction details are shown on Figure 3. <br /> Drill cuttings will be stored at the site pending receipt of disposal characterization <br /> data. The drill cuttings will be stockpiled on and covered with plastic sheeting. Four <br /> discrete soil samples will be collected from the drill cuttings. These samples will be <br /> composited in the laboratory and analyzed as described in Task 5. Steam cleaning <br /> rinsate will be placed in properly labelled drums pending disposal. <br /> Task 1.3. Well Development and Sampling <br /> The newly installed wells will be developed after being allowed to stand a minimum <br /> of 72 hours following completion, During development, the clarity of the discharged <br /> well water and selected groundwater parameters (pH, temperature, conductivity) will <br /> be monitored. When the discharge water runs clear and the groundwater parameters <br /> have stabilized, a groundwater sample will be collected. Groundwater removed from <br /> the well during development and sampling will be placed in properly labelled drums <br /> pending disposal, Groundwater samples will be analyzed as described in Task 5. <br /> Task 1.4. . Wellhead Survey <br /> The elevations of each top of well casing will be surveyed to mean sea level by a <br /> California licensed surveyor. Horizontal coordinates of the well will also be <br /> surveyed, <br /> Task 1.5. Laboratory Analyses <br /> Soil samples will be submitted for chemical analysis by a California state-certified <br /> Hazardous Material Tlvsting Laboratory. Selected soil samples will be analyzed for <br /> TPHg by Environmental Protection Agency (EPA) Method 8015 (Modified), and for <br /> benzene, toluene, ethylbetlzene, and total xylenes (BTEX) by EPA Method 8020, and <br /> methyl tert-butyl ether (MTBE) by EPA Method 8020. The sample of the stockpiled <br /> drill cuttings will be analyzed for TPHg, BTEX, and total lead for disposal <br /> characterization. <br /> The groundwater sample collected from the new welt will be. analyzed for TPHg, <br /> FMX, and MTBE- <br /> 7955.21-1 5 <br />