SITE HISTORY - Laserfiche WebLink

Home Browse Search

25, A third phase of site invest; .�t Herkenhoff, Inc. in which eigh' monitoring wells were drilled # conditions at the site (Figur plume, the used -oil tank faile 1990, The contents of the used - off -site. The tank inlets were of service since that time. S1 ' the soil borings and monitorin r_ benzene„ toluene, ethylbenzene, 6020 and total petroleum hyd modified EPA method 8015. Samp tank were also analyzed for TPV 8015. Laboratory analyses of s( hydrocarbons are pres,nit largel side of the former storage tan) additional soil sampling perfoi below. I Z r gation was performed by Leedshill- : soil borings and three groundwater and sampled to determine subsurface 4). In addition to the gasoline d a precision tank test on dune 5, oil tank were removed and disposed of then capped and the tank has been out )il samples were collected from both I wells and laboratory analyzed for total xylenes (BTEX) using EPA method rocarbons (TPH) as gasoline using les collected from near the used -oil as diesel using modified EPA method lil samples determined that petroleum y near the center and on the eastern excavation. This was confirmed by med by RESNA/WaterWork as discussed A fourth phase of investigation was conducted by RESNA\WaterWork in April of 1990. RESNA/WaterWork ^orporation supervised the drilling of 7 additional soil borings at the site, two of which were converted to groundwater monitoring wells and three of which were converted to vapor extraction wells (Figure ). Onw soil boring was. located north of the. former tank pit excavation in Channel Street to help determine the lateral extent of soil cont ination north of the site. One soil boring was angle drilled beneath the eastern dispenser island to a -total depth of approximately 20 feet below grade to determine subsurface conditions beneath the dispenser island. Two borings, one in the northeast corner and one wes. of the former tank pit excavation, were advanced 15 feet below first groundwater and converted to monitoring wells o determine water quality in these area, Logs of these two wells are contained in Appendix 1. All soil and groundwater samples Analytical Environmental Lab( Selected soil samples were lab method 8020 and TFN as gasoli Laboratory analyses determined limits was detected only in soi: concentrations which ranged fx petroleum hydrocarbons as gasol: in borings ASB?. 7.nd P1 in conc to 3300 ppm. Table 1 summari Laboratory reports with chain -o Appendix II. Based on the lab both Leedshill - He.kenhoff hydrocarbon impacted soils is r excavation and beneath the east extent of hydrocarbon impacted shallow water table at approxim A vapor extraction feasibility in April 1991 to de.erx.ine the Weber Point Property - 475 H2ORAF791.TLP were sent to state -certified Applied ratories in Fremont, California. ratory analyzed for BTEX using EPA Le using modified EPA method 8015. that benzene above method detection samples from borings VPl and.VP3 in )m 0.008 ppm to 0.076 ppm. Total ie concentrations were detected only ntrations which ranged from 2.4 ppm yes laboratory results from soils. .-custody documents are presented in ratory analyses of soil samples by nd [RESNA, the lateral exter.,-: of stricted to the former storage 'tank :rn dispenser island. The vertical soils has been constrained by th.i tely 30 feet below grade. !st was conducted by RESNA\WaterWork ossibility of vapor extraction as a 3