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QR [ ON <br /> I <br />� <br /> Soil samples will be collected primarily for soil logging.purposes. Three soil samples will <br /> L <br /> be analyzed at a State-certified analytical laboratory following the analytical program <br /> described in Section 3.1 . Soil analyses will be conducted to characterize the cuttings. <br /> U <br /> 2.2.3 Monitoring Well Installation Procedures <br /> i i The three monitoring wells will be installed to a depth of approximately 35-40 feet below <br /> LI <br /> grade, with a screened interval of 15 feet (Figure 3). The actual well depths and screen <br /> placements will be adjusted as required by the field.conditions encountered. <br /> f � <br /> The wells will be constructed using new 2-inch-diameter flush-threaded Schedule 40 <br /> t polyvinyl chloride {PVC) casings. The screened interval will be constructed from 0.010- <br /> inch slotted PVC pipe. The annular space around the screened interval of the well will be <br /> filled with a #3 Lonestar sand filter-pack to about 2 feet above the top of the screen. <br /> �I � <br /> An approximately 3-foot-thick layer of bentonite will be placed above the filter pack to <br /> provide an annular seal. The well will be surged before placing the annular seal to allow <br /> for filter pack settlement. After placement, the seal will be hydrated with potable water. <br /> I <br /> The remainder of the annulus to near ground surface (approximately 1 foot) will be filled <br /> with bentonite slurry. A locking cap and traffic-rated cover will be installed at the surface. <br /> LI <br /> A drawing showing the as-built well construction will be included on the well installation <br /> log. <br /> LEach well will be developed for approximately 1 hour after well installation by surging <br /> and bailing to remove fines from the filter pack and well screen. Development will be <br /> considered complete when approximately 5 casing volumes have been removed. <br /> Appendix B contains a sample well development log. <br /> The elevation and location of the .new wells will be surveyed after installation. Locations <br /> will be measured to the nearest 1/10 foot and elevations-to the nearest 1/100 foot relative <br /> to mean sea level. An Orion California-registered civil engineer will supervise or direct <br /> Uthe well construction and installation. <br /> U <br /> d SABFS\STOCKTON\WKP001.DOC 10/27/99 2-3 <br />