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V1-1111:113H UVIIII <br /> 7-11/Stockton 9 <br /> June 1989 <br /> ice for delivery to the analytical laboratory (see <br /> SOP 8) . At least three samples from each boring will <br /> be submitted to the laboratory for analyses of benzene, <br /> toluene, ethylbenzene, xylenes (BTEX) and total <br /> petroleum hydrocarbons (TPH)-as-gasoline using modified <br /> U.S. Environmental Protection Agency (EPA) Methods <br /> 5030/8020/8015. The samples submitted from each boring <br /> will be the following: (1) the one which exhibits the <br /> highest PID reading: (2) one from the top of the water <br /> table; (3) the last sample which shows a PSD reading as <br /> the hole is drilled to its total depth. <br /> The individual monitoring wells will be constructed of <br /> 2-inch-diameter PVC casing with machine-slotted screen <br /> from approximately 15-feet below and 10-feet above the <br /> water table. A sand pack will be placed in the annular <br /> m space from the bottom of the screened interval to <br /> 2-feet above the top of the screened interval. A <br /> ` minimum, 1-foot-thick bentonite seal will be placed <br /> above the sand pack. The screen slat size and filter <br /> pack materials will be 0.020 inch and a Lonestar No. <br /> 2/12 sand, respectively. These dimensions are based on <br /> previous borings and well installations at the site. <br /> Above the bentonite seal, the annular space will be <br /> backfilled with cement grout. The wellhead will be <br /> constructed of a street-rated "Christy box" grouted in <br /> place to provide a protective cover for those wells <br /> located in the driveway or paved areas. Monitoring <br /> wells will be constructed as described and as shown on <br /> Figure 5. The well casings will be sealed with <br /> locking, water-tight caps to prevent the entrance of <br /> surface water into the wells. <br /> TFxiiNOLOGS.Isr. <br />