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J. Ft. KLEINFELDER &ASSOCIATES <br /> r � <br /> 8 GROUND WATER CHEMICAL ASSESSMENT <br /> To assess the presence of petroleum hydrocarbons within groundwater below <br /> the project property, ground water samples were collected on 9 June 1987, <br /> and 10 June 1987, and submitted for chemical analysis, This phase of <br /> ground water sampling included the collection of six ground water samples <br /> from six different monitoring wells. The locations of the sampled <br /> monitoring wells are identified as MW-1, MW-2, MW-3, MW-4, MW-5, and MW-6 I <br /> and are shown on the Monitoring Well and Boring Location Map (Figure 2). <br /> A ground water chemistry summary for the samples collected on 9 June 1987, <br /> • j <br /> and 10 .lune 1987, has been prepared and is included within Appendix A <br /> (Table 3). <br /> The ground water monitoring wells were completed with a 2-inch <br /> flush-joint, threaded schedule 40 PVC p <br /> ] , , pipe. Well screen sections are � <br /> perforated with 0.02-inch factory-cut slots. The PVC pipe was <br /> steam-cleaned prior to installation. To provide an appropriate filter <br /> pack, the annular space between the well screen and the wall of the boring <br /> was backfilled with #2/12 Monterey sand to approximately 2 feet above the <br /> top of the perforated section (refer to Appendix D). A 3-foot thick <br /> -i <br /> rentonite clay plug was placed above the sand pack to provide a seal r <br /> against surface water infiltration. The remaining annular space was <br /> filled with bentonite/cement grout to the ground surface. Each well was 4 <br /> secured with a lock inside a cement utility box set flush to the ground <br /> surface. Construction details of each well are included within Appendix <br /> D. Well construction details for all project wells have been summarized <br /> on Table 1 (refer to Appendix A). <br /> After installation, all six monitoring wells (MW--1 through MW-6) were <br /> i <br /> developed with a surge block/air development tool. Surging with the tool <br /> along the screened interval of each well was performed to draw the <br /> sediment from the formation into and out of the well and to set the sand <br /> 53-87-443 27 <br /> E <br />