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r <br /> MEg § <br /> APPENDIX B: SOIL BORING AND WELL INSTALLATION PROTOCOL <br /> B. 1 SOIL BORING <br /> Soil borings will be drilled, using 10-1/4-inch hollow--stem <br /> augers ( for installation of four-inch wells) or using 8-1/4--inch <br /> i <br /> k <br /> augers ( for installation of two-.inch wells) . The borings will be <br /> drilled to a depth of 10-20 feet below the static depth to water <br /> to provide an adequate thickness of water for sampling as water <br /> levels fluctuate. The well casing and screen will be installed <br /> inside the hollow drill casing at the required depth (Figure <br /> B-1 ) . A sand filter pack, topped with a Bentonite seal and a <br /> cement-Bentonite grout to the surface, will be installed around <br /> the well screen and casing. <br /> The borings will be drilled by a qualified well drilling con- <br /> tractor with a valid C-57 water well driller's license. <br /> ^- All drill. pipes, rods, and sampling and downhole equipment will <br /> be steam.cleaned before drilling. A log of the soil boring will <br /> be recorded by an EA geologist overseeing the drilling opera- <br /> tions.. The boring logs will be signed and dated and will contain <br /> detailed geologic information, describing soils in accordance <br /> ` with the Unified Soil Classification System. The drill cuttings <br /> and: soil samples will. be monitored in the ff.eld for".the presence <br /> of . hydrocarbons with an organic vapor analyzer that uses 'a flame <br /> ionization detector. The moisture content of the soil samples . <br /> f and .the initial and static. water levels will- be noted on the <br /> logs. . <br /> s All 'drill cuttings will be contained onsite in -sealed 55-gallon - . <br /> drums. , The drums will be labeled with the borehole number, . <br /> owner's name, depth interval of soil contents, date, and moni- <br /> toring equipment readings. The drill cuttings will be disposed_ <br /> of at proper facilities on the basis of soil sample analysis. <br /> GGGFFF hN1y� . <br /> Ll <br /> e42/71050/7-90/apb B-1A. <br /> j <br /> S <br />