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9auk"Ll IBM ME== affmamm <br /> !. H. KLEINFELDER &ASSOCIATES <br /> .a o Quantification of contaminant concentrations near the leading <br /> edge of the hydrocarbon plume <br /> o Extraction of contaminants from the ground water near the leading <br /> edge of the hydrocarbon plume if deemed feasible arid/or necessary <br /> APPROACH <br /> I ` <br /> An early warning/detection monitoring well will be installed in the area <br /> JA sited in Section 3.4. We propose to install and develop a four-inch <br /> inside-diameter monitoring well at this location. Flush-threaded, <br /> +� Schedule #40, PVC casing with 0.02 inch factory cut screened sections will <br /> kf be utilized. The screened section will be set five feet above and twenty <br /> }, feet below the depth where ground water. is first encountered to <br /> is accommodate for seasonal fluctuations in the water table elevation. The <br /> p,r <br /> PVC casing will be steam-cleaned prior to installation. The annular space <br /> between the casing and the wall of the boring will be backfilled with <br /> _ clean #3 or #2/12 Monterey sand to approximately two feet above the top of <br /> �. the screened section. A three-foot bentonite plug will be placed above <br /> is <br /> the sand pack to provide a seal against surface water infiltration. The <br /> remaining annular space will be filled with sand/cement grout to the <br /> surface. The well will be secured inside a cement utility box set flush <br /> to the ground surface. <br /> Development of the well will proceed after sufficient time has elapsed to <br /> j� permit the backfill to set properly. A combination of surging and pumping <br /> will be conducted to develop the well. This technique will be employed <br /> until clarity of the discharge water is achieved. All development <br /> equipment will be decontaminated with a trisodium phosphate (TSP) <br /> ' solution, distilled water rinse, and steam cleaning prior to and after <br /> well development. <br /> r�. A registered civil engineer will be contracted to provide a relative <br /> elevation of the top of the well casing. This survey will be tied into <br /> the.__previous survey work performed to ascertain the relative top of casing - <br /> `f elevations of the other existing monitoring wells. <br /> 33-87-887 io <br /> - tis <br />