FIELD DOCUMENTS - Laserfiche WebLink

Home Browse Search

t 1 SECTION 3 PAST SITE INVESTIGATIONS AND RESULTS Section 3 describes the two UST sites and two sump sites and provides information pertaining to past removal activities and previous sampling and analytical results. Investigations will be conducted during this RI at four sites: former UST sites 517 and 816D, oil/water separator sump site 617, and waste oil sump 816D. Removal activities and related soil and groundwater sampling activities involving three USTs were conducted by Public Works at the two UST sites. No investigation work have been conducted at the two sump sites. Site locations are shown on the facility map (Figure 2). UST Site 517 Former USTs 517-1 and 517-2 were located in front of the west door of Building 517 in the main operation section of the NCS. Both USTs had a capacity of 4,000 gallons and contained transportation fuel, most likely leaded gasoline. The USTs were removed in 1990. During removal activities, soil and groundwater samples were collected and analyzed. The analytical results for these samples are reported below. Previous Sampling and Analytical Results Four soil samples were collected from the excavation pit during removal of former USTs 517-1 and 517-2. One sample was collected from each corner of the pit; these samples were designated 517-N, 517-S, 517-E, and 517-W. All four samples were analyzed for total petroleum hydrocarbon (TPH) compounds, and for benzene, toluene, ethylbenzene, and xylenes (BTEX). No chemical constituents were present in the soil samples above the method detection limit. One groundwater sample was collected from the bottom of the excavation pit and analyzed for TPH and BTEX. TPH as gasoline (TPH- gasoline) was detected at a concentration of 2,100 gg/l. BTEX compounds were detected in concentrations ranging from 10 to 93 gg/l. 3-1