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Geological Technics Inc. Page 8 C&B Equipment Monitoring Well Installation Report Project No.336.2 November 13,1995 Groundwater Analyses September 8, 1995 Berk oluene Ethyl Total benzene X lenes Gasoline Diesel Well No. Hate l /1 /1 /1 /1 /1 MW-1 09-08-95 21 2 ND(<0.3) 5 356 ND(<50) alm 09-08-95 2 1 2 4 200 ND(<50) 3. MW-3 09-08-95 ND(<0.3) ND(<0.3) ND(<0.3) ND(<0.3) ND(<50) ND(<50) `1 ND=non detect(detection limits in parentheses) =j The groundwater laboratory analytical data summarized above suggest that the lateral limits of the water table contamination appear to be defined only to the south south-west of the former UST excavation. The extent of groundwater contamination j to the west, north, and east has not been defined. 4.0 CONCLUSIONS AND RECOMMENDATIONS The recent subsurface investigation was conducted with the intention of cost effectively obtaining as much geologic, hydrogeologic, and chemical information as possible while operating under the Underground Storage Tank Cleanup Fund Program's (USTCFP) deductible amount. This preliminary investigation was successful in that the site now has site specific hydrologic monitoring capability, we have evidence which suggests that the plume has been defined in the southwest direction, and we now have enough information to consider methods for cost effectively defining the extent of hydrocarbon impact at this site. ,.i--- Geological Technics Inc. concludes from the information gathered during this preliminary subsurface investigation that a release of petroleum hydrocarbons has occurred and is presently impacting the soil and groundwater environments of this property. The preliminary data suggest that the plume has not been defined to the east, west and to the north in the suspected historical down gradient direction. ,r- Geological Technics Inc. recommends that the lateral and vertical extent of impacted soil and groundwater be defined and remedial alternatives be evaluated. Our proposed approach to this problem is outlined below. '.< Hold a meeting with Frank Coelho, Ron Rowe of the SJCPHSEHD, and Ray Kablanow of Geological Technics Inc. to discuss cost effective options and 1 approaches and to develop a schedule of tasks to be performed. Items to be discussed would include the following, plus other concerns or alternatives. • To move forward towards site characterization Geological Technics Inc. recommends that the magnitude and lateral extent of the plume be evaluated 1 `; using conventional soil and groundwater sampling methods i.e. soil borings and