Laserfiche WebLink
J. H. KLEINFELDER &ASSOCIATES <br /> maintenance shop. The locations of all monitoring wells are <br /> shown on Plate No. Z. <br /> The ground water monitoring wells were completed with four inch <br /> inside—diameter, flush--threaded joint, schedule 40 PVC Pipe- <br /> well screen sections were perforated with 0.020—inch factory—cut <br /> slots . The screened section was set five feet above and twenty <br /> feet below the depth where ground water was first encountered. <br /> Ground water was encountered approximately 28.5 feet below the <br /> ground surface in the r.ionitoring wells. The PVC pipe was steam— <br /> cleaned prior to installation. The annular space between the <br /> pipe and the wall of the boring was backfilled with clean Lone <br /> Star Industries 13 Monterey sand to approximately two feet above <br /> the top of the perforated section. A three—foot bentonite plug <br /> was placed above the sand pack to provide a seal against surface <br /> water infiltration. The remaining annular space was filleu with <br /> wand/cement grout to the surface. Each well was secured inside a <br /> cement utility box set flush to the ground surface. Con .truction <br /> diagrams of each well are shown on Plate Nos . 4 through 6 <br /> (Appendix A) . <br /> __- 4.4 MONITORING WELL DEVELOPMENT AND SAMPLING <br /> Monitor wells MW-5, MW-6, and MW-7 were developed with a four— <br /> inch submersible pump on September 3, 1986. Development was <br /> achieved by surging the pump along the screened interval of the <br /> well, drawing the fine sediment through the filter pack into the <br /> ------ --- -- --well--casing.-----The---sediment laden water was then pumped from the <br /> ? <br /> 19:531 <br />