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19 July 2000 . AGE-NC Project No 96-0232 Page 6 of 29 is 4.0. CPT DRILLING: GROUND WATER SAMPLE COLLECTION On 28, 29, and 30 March, a first phase of work was performed Soil borings P13, P14, P15,P16, and P 17 were advanced at the site utilizing cone penetrometer testing (CPT) technology to collect soil characteristics data for the purpose of identifying possible migrational pathways of petroleum hydrocarbons and other associated contaminants in the subsurface CPT data was then utilized for construction of cross sections, Figures 21, 22, and 23, presented in the 19 June 2000 - Problem Assessment Report, prepared by AGE Additionally, a cross-section illustrating the tentative hydrologic zones, is presented in Figure 26, of this report On 31 March and 03, 04 April 2000, a second phase of work was perfonned Soil boring twins P 13, P14, P15, P16, and P17 were advanced at the site by revisiting the first phase CPT boring locations Utilizing CPT technology ground water samples were collected from depth-discrete locations from all five borings CPT logs are presented in Appendix C A site plan depicting boring locations is presented in Figure 2 0 4 1 CPT DRILLING AND GROUND WATER COLLECTION PROCEDURES A 25-ton truck-mounted CPT drill ng equipped with 2-inch diameter hollow-stem rods fitted with a HydroPunch ground water sampling tool utilized a hydraulic ram to advance to specified depths 0 of each soil boring Soil characteristics data collected from CPT borings P13 through P17 was utilized to construct lithologic cross sections from which AGE defined five tentative hydrologic units The hydrologic units are roughly defined as the intervals from 5 to 30 feet bsg(First Zone), 40 to 60 feet bsg(Second Zone), 65 to 75 feet bsg (Rocky's Upper Zone), 95 to 105 feet bsg (Secondary Aquifer Zone), and 130 to 150 feet bsg (Primary Aquifer Zone) Specified zones are defined on basis of the CPT soil characteristics data Tentative hydrologic zone boundaries may vary as much as 10 feet between locations Due to AGE's limited data from the First Zone, Second Zone, and Rocky's Upper Zone (shallowest screen interval in Rocky's Restaurant domestic well), the possibility that the upper three zones may not be hydraulically distinct is not dismissed The data collected strongly suggests to AGE that the Secondary Aquifer Zone and the Primary Aquifer Zone are separate hydrologic units although the fine grained unit separating Rocky's Upper Zone and the Secondary Aquifer Zone thins toward the west CPT boring logs and data sheets are presented in Section C Geologic cross sections are presented in Figures 21, 22, and 23 of the 19 June 2000-Problem Assessment Report, prepared by AGE Additionally, a cross-section illustrating the tentative hydrologic zones, is presented in Figure 26, of this report 0 Second Zone, Rocky's Upper Zone, and Secondary Aquifer Zone were sampled and grab ground • Advanced CeoEm ironmcntal Inc