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04/23/2003 15:41 2098325? WRIGHT ENVIRQNMD PAGE 07 <br /> FMloratory Boring and Log; n¢ <br /> Four exploratory borings will be drilled at the locations shoym on Figure 1. Drilling ar,d well <br /> installation permits will be secured from PHS EHD, and a utility clearance will be performeJ pxiior <br /> to doing the fieldwork. The boreholes will be drilled with truck mounted mud rotary frilling <br /> equipment Logging will use both a continuous chip log and discrete soil/sediment from in tervals <br /> of interest. The drill bit will be advanced collecting continuous cores of soil in each bo:.-ehole. <br /> The sampler will then be retrieved and dissembled, and the soil filled acetate liner will be sealed <br /> with Teflon paper or foil and plastic end caps, labeled, logged onto chain-0f-custody fortas and <br /> place in a chilled ice chest. Soil sample intervals retained for chemical or physical analysis :wM be <br /> cut from the liners or sealed in metal sampling tubes. <br /> The boreholes will be logged using the Unified Soil Classification System under the supcM.;ion of <br /> a registered geologist. Additional lithologic information will be colleted to descritye the <br /> subsurface geology. The samples will be collected at five-foot intervals, at intervals of suspect <br /> contamination and at stratigraphic Mures of interest at the geologist discretion. Upon <br /> completion of the borehole drilling and collection of water samples, the boreholes iaill be <br /> backfilled with grout, placed from the bottom to top of the borehole. <br /> Soil/sediment samples will be collected in the aquifer strata for performing physical testing,. The <br /> physical testing is anticipated for moisture content, bulk density and hydraulic condu".-tivity. <br /> These samples will be collected using corgi tubes to collect the material during borehole 1 trilling <br /> for the wells. One physical sample will be taken from one well in the 58-63 foot interval&A one <br /> sample from the 114-119 foot interval. <br /> Drilling Fluid Mud,Decontamination Water and Well Water Storage and Dishsat <br /> The drilling mud will be placed into closed top barrels and stored on-site. The drilling mut:1 fluid, <br /> circulation water and well development water will be marked w drums_ aANIonitonng well purge <br /> water will also be stored in closed top barrels and labeled and stored on-site. Once resu Its are <br /> received for the drilling fluid mud, decontaminations water and purge water, these fluids YM be <br /> properly disposed off-site. <br /> Monitoring Well Installation <br /> Four monitoring wells will be installed for long term plume monitoring. Three wells will b(:eased <br /> with two-inch diameter SO. 40 PVC casing and one well with four-inch diameter casing, th°padW <br /> together; glues will not be used. The sloth interval will use a 0.020-inch slot for all wells and <br /> the annular space around the slots will be backfilled with a 2/12-size sand_ Previous expunence <br /> has shown this to be a reliable well design in fine grained and stratified depositional eavirontuents. <br /> Final well design will be modified to the site-specific conditions encountered in the bcrehole <br /> during drilling. <br /> Pas-,5 of 5 <br />