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I <br /> SITE ASSESSMENT ACTIVITIES <br /> i <br /> An initial subsurface assessment was performed by WaterWork Corporation One soil boring was <br /> advanced to a depth of approximately 35 feet below surface grade (bsg)near tank A Ground water <br /> was encountered at 32 feet bsg Details of the initial investigation were summarized in a Preliminary <br /> Assessment Report dated 12 January 1990,prepared by WaterWork <br /> Five soil borings(B I through 135)were drilled at the site by Geological Audit Services,Inc between <br />' 11 and 14 February 1994 Borings B 1 through B4 were completed as ground water monitoring wells <br /> MW-1 through MW-4,respectively Free product was encountered in MW-4 and removed between <br />' September and November 1994 Total petroleum hydrocarbons quantified as gasoline(TPH-g)and <br /> volatile aromatics(benzene,toluene,ethylbenzene and xylenes,BTE&X)were detected In each well <br /> TPH as diesel (TPH-d) was detected in MW--4 <br />' From 19 to 26 February 1996, six borings were advanced at the site buy Advanced <br /> GeoEnvironmental, Inc Boring MW-7 was advanced to a depth of 60 feet and was completed as <br /> a ground water monitoring well Boring VW-1, drilled at an angle of 30° from vertical directed N <br /> 34°E, was advanced to a vertical depth of 55 feet bsg with a horizontal run of 31 8 feet and was <br /> backfilled to surface grade Borings VW-2, VW-3 and VW-4 were advanced vertically to a depth <br /> I of 55 feet and were completed as vapor extraction remediation wells (VW-2 double-completed) <br /> Boring VW-5, drilled at an angle of 10"from vertical directed N 80' W, was advanced to a depth of <br /> 55 vertical feet bsg with a horizontal run of 9 7 feet and was trnple-completed as a vapor extraction <br /> lieremediation well Petroleum hydrocarbons were detected in each boring at concentrations as high <br /> as 23,000 mg/kg (milligrams per kilogram, equivalent to parts per million, ppm, VW5 at 15 feet) <br />' Sample VW3-40 and VW5-30 were analyzed for bioenumeration and physicochemical properties <br /> Very low populations of both general and selective microbial populations were observed Nitrogen <br /> concentrations were below optimal for biodegradation of hydrocarbons Additional background <br /> information is summarized in the AGE-prepared Quarterly Report-August 1997 <br /> I <br /> f <br /> I <br /> • <br /> f <br /> Advanced GeoEnvironmental,Inc <br />