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h i . 14 September 2004 AGE-NC Project No 96-0235 ' Page 2 of 8 CPT-03 and associated ground water sampling bonngs were advanced south-southwest of the former UST No 3 location to determine the down-gradient extent of petroleum hydrocarbon-impacted ground water CPT-03 was advanced to approximately 210 feet bsg • -CPT-04 and associated ground water sampling borings were advanced north of the former ' UST cluster excavation a anon (Figures 2 and 4) to determine the vertical exte f petroleum ' hydrocarbon-impacted ground water at the former UST cluster area CPT- s advanced to approximately 175 feet bsg • Ground water sampling boring CHB-01 was advanced approximately 70 feet east-northeast of CPT-04 to determine the vertical extent ofpetroleum hydrocarbon-impacted ground water down-gradient of the former UST cluster area s Borings CPT-01 through CPT-04 were advanced utilizing CPT technology to characterize the geological and hydrogeological framework and to identify potential contaminant-migration pathways ' beneath the site CPT borings CPT-02 through CPT-04 were terminated at their respective total depths due to refusal • The CPT investigation utilized a 25-ton truck-mounted CPT drill ng equipped with 1 50-inch diameter hollow-stem rods A hydraulic ram was utilized to advance a cone penetrometer tip attached to the hollow-stem rod assembly to total depth of each soil boring The soil parameters of cone penetrometer tip resistance,sleeve friction and pore waterpressure were continuously measured as the cone penetrometer was advanced to depth Continuous boring logs were generated utilizing the Hogentogler Co CPT computer program The Hogentogler Co computer program utilized the CPT Soil Behavior Classification System (Robertson, P K , Campanella, R G, Gillespie, D and Greig, J , 1986) to generate a general lithology type and display on a CPT boring log (See Appendix B) Ten-soil bonngs were advanced adjacent to respective initial CPT borings for collection of grab ' ground water samples The depth below grade for the ground water sampling intervals were based on the CPT lithologic sounding data In addition, soil boring CHB-01 was advanced approximately 70 feet east-northeast of CPT-04(Figures 2 and 4) The sampling interval depth for boring CHB-01 r was based on the lithologic sounding data of CPT-04 Grab ground water samples were collected utilizing the 25-ton truck-mounted CPT drill ng equipped with 1 75-inch diameter hollow-stem rods fitted with a Hydro Punch ground water-sampling assembly,which was pushed to specified sampling depths in each soil boring, diagrams of the sampling assemblies are illustrated in Appendix B Ground water samples were collected from specified depth intervals (zones)based on the acquired I CPT-lithology data indicating favorable conditions for sampling To collect ground water samples, a HydroPunch sampling tool was pushed into the specified zone,then withdrawn approximately four feet to expose an inlet screen, the interior of the sampling tool filled with water and a V2-inch outer Advanced GeoE nvi ron mental,Inc r I I ,