ARCHIVED REPORTS XR0004684 - Laserfiche WebLink

Home Browse Search

I I • 23 May 2001 AGE-NC Project No 95-0144 IPage 4 of 8 ' 26 EXCAVATION SOIL SAMPLE COLLECTION AND ANALYSIS Soil samples were collected from the floor and sidewalls of the excavation and stockpiled soil by AGE personnel Excavation samples were coll6cted from the excavator bucket using 2-inch by 3- inch brass sleeves Stockpiled soil samples were collected by digging approximately one foot into the soil'and then pushing 2-inch by 3-inch brass sleeves into the soil pile Upon collection,the exposed ends ofthe sample sleeve were covered with Teflon sheets, capped and sealed with tape Each sample sleeve was then labeled with a unique identification, the depth, time, r date and sampler's initials Appropriately sealed and labeled samples were placed in a chilled container under ice and transported under chain-of-custody to MAI Selected soil samples were analyzed for the following constituents • TPH-g, TPH-d and TPH-mo by EPA Method 8015 Modified, + BTEX by EPA Method 8020, • Fuel oxygenates including di-isopropyl ether(DIPS), ethyl tert-butyl ether(ETBE), MTBE, tertiary amyl methyl ether(TAME), tertiary butanol (TBA), methanol and ethanol and ethyl dibrornide (EDB) and 1,2 dichloroethane (1,2 - DCA) by EPA Method 8260 Modified, • CAM 17 metals by EPA Methods 6010, 7471, 7060, 7740 and 7841, and ' • Volatile halocarbons by EPA Method 8010 J r t r E 3.0. FINDINGS ' Ground water'elevation and flow direction were calculated from field data, hydrocarbon-impact to I ground water and soil was inferred from laboratory analysis of the ground water and excavation samples ' 31 RELATIVE GROUNDWATER ELEVATION AND GRADIENT r The elevation of ground water in each well was calculated by subtracting the depth to water from the- surveyed casing elevation (Table 1) Between November 2000 and February 2001, ground water elevation increased between 0 37 'feet and 1 04 feet`in the 15 wells at the site The approximate hydraulic gradient for the February 2001 monitoring event was inferred to be 0 003 ft/ft with a northeast flow direction Ground water elevation contours derived from data collected on 28 • February 2001 are depicted in Figure 3 Ground water was between approximately 0 82 and 6 08 feet above the screened interval in monitoring wells MW-1, MW-2, MW-4, MW-5, MW-8, MW-11, Advanced GeoEnvironmeutai,Inc 1 1 !