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. 4 . WORK PLAN <br /> This work plan addr;:sses potential off--site and vertical movement <br /> of groundwater contamination toward the nearby domestic wells. <br /> The proposed work consists of the installation of two on-site <br /> q p�in��3�t dig 3)iSPiit�g�;�ii varl�:} bi$&) L IS <br /> the present level sof the aquifer . <br /> These two wells will be 1 .ed at the western and eastern <br /> boundaries of the site, in the directions of potential con- <br /> taminant movement in water under the influence of pumping in <br /> these domestic wells. <br /> 4 . 1 SOIL BORING <br /> Two soil borings will be drilled, using a hollow-stem auger ( 10- <br /> inch o.d. ) , at the locations shown in Figure 3. Well casing and <br /> screen will be installed inside the auger at the required depth. <br /> A sand filter, a Bentonite seal, and a cement--Bentonite grout <br /> will be installed around the well screen and casing as roach <br /> section of the auger is gradually removed from t.%e borehole. <br /> All drill pipes, rods, samp]ing, and downhole equipment will he <br /> steam cleaned before drilling. A log of the soil boring will be <br /> recorded by an EA geologist overseeing the drilling operations. <br /> The boring logs will l`ae signed and dated and will contain <br /> detailed geologic information, classified according to th�i <br /> Unified Soil Classification System. The drill cuttings and soil <br /> samples will be monitored in the field with an organic vapor <br /> analyzer (photoionization detector or a flame ionization <br /> detector ) for the presence of Lydrocarbons. The moisture content <br /> of the soil samples and the initial and static water levels wil- <br /> be noted on the logs. . <br /> a5t/gr�so/6-�a/tx 6 <br />