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GRIIN <br /> approximately 10 minutes The organic vapor levels in the headspace will be measured <br />' using a field PID The same sample will be visually examined and the results of the visual <br /> observation and headspace reading will be recorded on the well installation log Sample <br />' boring and well installation logs are provided in Appendix B <br />' Soil samples will be collected primarily for soil logging purposes Two soil samples will <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 vertical soil <br /> profile <br />' 2.2.3 Monitoring Well Installation Procedures <br />' The monitoring well will be installed to a depth of approximately 25 feet below grade, <br /> 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 /> The wells will be constructed using new 3/4-inch-diameter flush-threaded Schedule 40 <br /> 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 /> 1 <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 /> The remainder of the annulus to near ground surface (approximately 1 foot) will be filled <br /> with bentonite slurry A locking cap and a 7-inch, traffic-rated well box will be installed <br /> at the surface A drawing showing the as-built well construction will be included on the <br /> Iwell installation log <br /> The well will be developed for approximately 1 hour after well installation by surging and <br /> 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 /> iAppendix B contains a sample well development log <br /> S\BFS\STOCKTON\WKP003 DOC 03/22/01 2-3 <br />