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08-19-94 The over -excavation was completed this date with the length "tended to approximately 75 feet on the east site, 55 feet on the west side <br />and to 35 feet in width. Five confirmation soil samples were obtained from the sidewalls. <br />SOIL SAMPLE RESULTS <br />(PPM) <br />08-19-94 <br />SAMPLE ID <br />DIESEL <br />BENZENE, TOLUENE, ETHYLBENZENE <br />AND XYLENE <br />EW -1A 14' <br /><5.0 <br /><0.005 <br />EW -3A 14' <br />5200.0 <br /><O.ao5 <br />WW -3A 18' <br /><5.0 <br /><0.005 <br />WW-tA 16' <br /><5.0 <br /><0.005 <br />WW -2A 16' <br /><5.0 <br /><0.005 <br />08-26-95 The eastern portion of the tank pit which showed the elevated level of diesel hydrocarbons was over -excavated this date with one <br />confirmation soil sample obtained at 18 feet below ground surface. <br />SOIL SAMPLE RESULT <br />(PPM) <br />08-26-94 <br />SAMPLE ID DIESEL <br />EW -3B 18' <5.0 <br />03-07-95 One monitoring well was installed just north of the former tank pit area, in the downgradient direction of groundwater flow (based on data <br />from the Nestle investigation). Three soil samples from the boring showed no hydrocarbons at 16', 21', and 26' below ground surface. <br />Groundwater was encountered at approximately 26' below ground surface. This well was sampled trice with the following results: <br />WATER RESULTS <br />(PPB) <br />WELL <br />DATE <br />TPH-D <br />TPH-G <br />BENZENE <br />TOLUENE <br />ETHYL <br />BENZENE <br />XYLENE <br />MW -1 <br />03-13-95 <br /><50.0 <br /><50.0 <br />2.0 <br /><0.3 <br /><0.3 <br />2.0 <br />MW -1 <br />06-15-95 <br /><50.0 <br /><50.0 <br />0.6 <br /><0.3 <br /><0.3 <br />1.0 <br />08-04-95 PHSIEHD receives Groundwater Investigation Report, submitted by Geological Technics Inc., dated July 31, 1995. <br />10-03-95 PHS/EHD performs a review of the file for the Nestle investigation. The nearby Nestle wells show background groundwater quality to be <br />degraded by a release of trichloroethene (TCE) and associated compounds. This site is located within the plume area of the Nestle <br />discharge. Because the bulk of the impacted soil has been removed, and only low levels of petroleum hydrocarbons evidenced in the <br />groundwater downgradient from the former tank pit area, and because background water quality is polluted by TCE, PHS/EHO concludes <br />that no further action with regard to the underground storage tanks formerly located on the property is warranted. <br />2 <br />