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V � The Beverage Source 202/799-5030 March 15, 1988 PROPOSED SCOPE OF WORK The proposed scope of work would involve drilling sail borings and collecting soil samples in order to generate soil profiles defining the vertical and horizontal extent of the contamination. Water sampling would be performed to ascertain subsurface water conditions. It is GTI ' s opinion that the soil contamination is probably concentrated in a limited area (not laterally extensive) due to the predominance of sandy soils present in the soil column at depth. However, GTT feels it is important to clearly define the soil as well as the groundwater contamination. The groundwater would be sampled by deepening 3 of the soil borings to a depth of 15-feet below first encountered water (or to 70 feet , whichever occurs first) . The following specific work steps detail GTI 's approach: o Drill 8 soil borings to approximately 50-feet below grade. o Collect soil samples at 5-foot intervals (see Appendix I, Standard Operating Procedures [SOPS] 14 and 15) . Three selected samples from each boring, based on field inspection will be analyzed for total petroleum hydrocarbons using U.S. Environmental Protection Agency (EPA) Method 418 . 1 ; benzene, toluene, ethylbenzene, and xylene (BTEX) ; total petroleum hydrocarbons as gasoline using EPA Modified Method 5030/8015/8020; and polynuclear aromatics (PNAs) using EPA Method 8100. a Deepen 3 of the 8 soil borings to approximately 70 feet or to 15-feet below first encountered water (whichever occurs first) . o Convert the 3 deepened borings to monitoring wells by installing 2-inch-diameter, 0.020-inch slot, PVC well screen to 15-feet above expected high water level and finish to the surface with blank PVC casing. The annulus of the well will be packed with No. 2 clean- 3