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Site Background Information: Cherokee Truck Stop AGE-NC Project No. 97-0312 Page 4 of 6 lateral extent of contamination.Based on these soil results,ESE expanded the excavation to the east, west and south in an attempt to remove as much soil containing potentially hazardous waste as possible. In September 1990, ESE installed three ground water monitoring wells in the vicinity of the excavation (Figure 2) to assess ground water quality and gradient as part of the Hydrologic Assessment Report(HAR)required by the CVRWQCB under the Toxic Pits Cleanup Act(TPCA). In October 1990,ESE advanced two additional borings on the south side of the excavation(near the steam cleaner)and also sampled the sidewalls in this area. The wells and borings were drilled and sampled according to an approved work plan submitted to the CVRWQCB dated 30 April 1990 (ESE, 1990a). A draft copy of the HAR was prepared by ESE and issued to the CVRWQCB on 17 December 1990 (ESE 1990c);the August through October 1990 investigation data were presented in the draft report. The HAR concluded that the ground water had not been impacted by the former surface impoundment and that a landfill was present beneath the impoundment.The HAR also established the approximate limits of the landfill in the north and south directions based on boring data and the east and west limits based on aerial photograph data;the report concluded that the landfill apparently does not extend deeper than 13 to 15 feet below surface grade (bsg). On 29 April 1991, the CVRWQCB issued a Cleanup and Abatement Order to Delta Truck Sales (CVRWQCB,199 la).Delta Truck retained Proactive Environmental(Proactive)to respond to these orders. Delta Truck, Proactive, and the CVRWQCB met on 18 July 1991 to discuss cleanup and facility closure. Meeting notes were prepared by the CVRWQCB which outlined the regulatory oversight required to leave waste onsite (CVRWQCB, 1991c). The CVRWQCB set a deadline of O1 September 1991 for Delta Truck to respond to the cleanup and abatement order. The following items were to be submitted: • Remediation and disposal plan for stockpiled wastes and wastes within the impoundment; and • Closure plan and Report of Waste Discharge, if wastes are to remain at the facility. To complete the HAR, the CVRWQCB requested additional monitoring of the ground water to verify the initial ground water results and to define the lateral extent of the former landfill in the east and west directions. ESE was retained by Proactive to respond to the HAR addendum request. For this addendum, ESE drilled five soil borings to estimate the extent of lead and hydrocarbon contamination from the former landfill and resampled the three onsite monitoring wells.The results of this 1991 investigation indicated that the ground water was not impacted by the former Advanced GeoEnvironmental,Inc.