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- 28 March 1997-_ = - _AGE-NC-95-0103 Page 2 of b _._ 1 Approximately 250_ cubic yards of excavated soil were transported to property owned by Mr Chapin - And aerated Confirmatory sampling has indicated that petroleum hydrocarbons were no longer present in the Temoved soil 2 3 _ASSESSMENT OF IMPACTED SOIL AND GROUND WATER In-December 1990, one ground water-monitoring well (MW-1) was installed at the site by Roger y" _ Foott Associates, Inc-The presence'of hydrocarbon-Impacted soil on the site was confirmed by analysis of soil samples collected during the Installation of MW-1 A ground water sample collected - - from MW-1 contained high-concentrations of total petroleum hydrocarbons quantified as gasoline ,r = (TPH-g) and volatile aromatics (benzene, toluene, ethylbenzene and xylenes BTE&X) Four soiI'boririgs-were drilled at the site--by SEACOR In December 1993 Three of the borings were completed-as 2-inch diameter ground water monitoring wells (11v1W-2 through MW-4) The fourth _ - _ _ - - baring was completed as d4-inch diameter vapor extraction well (VW-l1 -Low concentrations of- petroleum lhydiocarbons weredetected in soil sarnples from MW-3,MW-4 and VW-'l Hydrocarbons were not defected in Soil-samples from MW-2 To - -= To further delineate the impacted soil, eight additional soil borings were drilled in March 1994 (B-6 through_B-13) Grab water samples were collected from seven of the borings The-assessment activities were detailed in the July 1994 Problem Assessment Repo)t (PAR) prepared by SEACOR _'- Ground water monitoring has been performed at the site on ten occasions since December 1990 Free _ product was encountered in MW-1 between 1990 and 1995 Product was also encountered in MW-4 during-the January and April 1995 sampling events Low hydrocarbon concentrations have been detected in samples collected from MW-2 and MW-5 Analytical results of ground water samples _ -are summarized 6h Table 2 24 FEASIBILITY STUDIES �-_ Three temporary vapor wells (VW-2, VW-3 and VW-4) were Installed at the site in June 1994 for use as observation wells for a vapor extraction pilot test On June 10, 1994,-SEACOR conducted a soil vapor extraction(SVE)test at the site A=vacuum was applied to an extraction well (VW-1) and- '-¢ = measurements of flow rate and vacuum were collected from three temporary observation wells(V W- - 2,r V W-3 and VW-4) -However, a vacuum could not be achieved on VW-1, so the internal combustion (IC) unit was connected to one of the observation wells (VW-3)' SEACOR indicated that it appears VW-1 may have been placed too close to the western UST excavation which was - - backfilled with pea gravel, and "short circuited" the attempt to draw a significant vacuum