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'E' B <br /> f, <br /> , <br /> A <br /> 7-11/Stockton 9 <br /> April 1989 <br /> toluene, ethylbencene, xylenes (BTEX) ar,d total <br /> petroleum hydrocarbons (TPH)--as-gasoline using modified <br /> U.S. Environmer(tal Protection Agency (EPA) Methods <br /> 5030/ 8020,8015. The samples submitted from each <br /> boring will be the following: (1) the one which <br /> exhibits the highest PID reading; (2) one from the top <br /> of the water table; (3) and the last one which shows a <br /> PTD reading as the hole is advanced. For the on-site <br /> well nese, four samples will be submitted to the <br /> laboratory for analyses of BTEX and TPH-as-gasoline. <br /> They will include the following: f1) one for the first <br /> evidence of contamination (PID reading) ; (2) one from <br /> the top water table; (3) t.,e one which exhibits the <br /> highest PID reading; (4) acid the last one which shows a <br /> PID reading aL the hole is advanced. <br /> ciiial monitoring well will be constructed of <br /> rd. <br /> 2-inch-diameter PVC: casing with factory--slott3d screen <br /> from approximately 15-feet below and 5-feet above the <br /> water table. A sand pack will be placed in the annular <br /> space from the bottom of the screened interval to <br /> 2-feet above the top of the screened interval. A <br /> - mininAum, 3-foot-thick bentonite seal will be placed <br /> above the sand pack. The screen slot 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 instal]ations 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 /> — <br /> Ilk' �kn1�Inr4Ttat <br /> .,...E TECHM IANAI I\C. <br />