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'1 s <br /> 24 September 2001 <br /> AGE-NC Project No 95-0109 <br />' Page 3 of 9 <br /> Each of these tasks is descnbed in greater detail below <br />' 3 l -PRE-FIELD WORK PREPARATIONS~ - <br /> A health and safety plan will be updated in accordance with Occupational Safety and Health <br />' Guidance Manual for Hazardous Waste Site Activities (National Institute for Occupational Safety <br /> and Health Administration, U S Coast Guard and U S Environmental Protection Agency, 1985) <br /> Prior to mobilization, the boring and monitoring well locations will be clearly marked and a utility <br />' clearance obtained through Underground Service Alert <br /> 32 CPT DRILLING <br /> t <br /> AGE proposes to drill four CPT soil borings at the site as part of the site assessment The proposed <br /> CPT soil boring locations are Illustrated on Figure 1 <br /> Based on impacted ground water encountered during the previous investigations and sampling <br /> events, AGE proposes the CPT soil borings to characterize subsurface lithology, identify potential <br /> contaminant migration pathways and to assess the vertical extent of impacted ground water in the <br /> I -following locations <br /> • In the area of the former USTs, <br />' a In the area of the former dispensers, <br /> • Between 3 and 5 feet northeast of ground water monitoring well MW-8, and <br /> • Between 60 and 70 feet east of ground water monitoring well MW-3 <br /> The CPT boring shall be advanced to approximately 150 feet bsg utilizing a 25-ton truck-mounted <br /> CPT drill rig equipped with 2-mch diameter hollow-stem rods, however, total depth of the borings <br /> may vary due to geologic conditions and field evidence of impacted-ground water encountered <br /> during boring advancement <br />' 3 3 CPT GROUND WATER SAMPLE COLLECTION AND ANALYSIS <br /> I Grab ground water samples will be collected,from twinned CPT borings in selected Intervals of <br /> saturated porous and permeable soil beginning at 80 feet bsg Sampling intervals will be selected <br /> based on interpretation of lithologic data from the Initial CPT boring with an objective of sampling <br /> significant hydrologic units Groundwater sampling procedures are outlined in section 4 2 Selected <br /> Advanced GeoEnvaronmental,Inc. <br /> 4 <br />