ARCHIVED REPORTS_XR0009415 - Laserfiche WebLink

Home Browse Search

' 18 July 2002 AGE-NC Project No 96-0254 ' Page 5 of 17 • Only soil samples from PB-4 contained detectable concentrations of BTEX compounds ' ranging from 0 006 mg/kg to 0 099 mg/kg No other analytes were detected above laboratory reporting limits Laboratory results of soil samples analyzed for petroleum hydrocarbons area summarized in Table 2 ' • TPH-g, TPH-d and BTEX compounds were detected in all three ground water samples at concentrations as high as 100,000 gg/l,36,000µg11 and 11,000 gg/l,respectively Laboratory ' results of grab ground water samples analyzed for petroleum hydrocarbons area summarized in Table 3 ' On 18 and 19 November 1999 two ground water monitoring wells(MW-4 and MW-7)were installed on-site A total of 4 soil samples were submitted for analysis ' TPH-g,TPH-d and BTEX compounds were detected in only the 5-foot soil sample collected from MW-4 at concentrations of 940 mg/kg,270 mg/kg,9 6 mg/kg,9 8 mg/kg,20 mg/kg and ' 48 mg/kg, respectively Laboratory results of soil samples analyzed for petroleum hydrocarbons area summarized in Table 2 lie On 13 March 2001, two soil borings (CPT-1 and CPT-2) were advanced on-site utilizing CPT technology to model the geological and hydrogeological framework and to assess the vertical extent of dissolved petroleum-hydrocarbons beneath the site A total of four"grab"groundwater samples ' were collected from CPT-1 and CPT-2 and submitted for laboratory analysis • TPH-g,TPH-d and BTEX compounds were detected only in the water sample collected from I CPT-2 (61 to 65 feet bsg), at concentrations of 110µg/1 TPH-g, 85 µg/1 TPH-d, 2 4 gg/l benzene, 3 3 p.g/l toluene, 1 3 gg/l ethylbenzene and 5 9 µg/1 total xylenes Laboratory analysis of grab ground water samples collected from CPT-1 at depths of 26 feet to 30 feet, did not report any of the analytes at or above laboratory reporting limits Fuel oxygenated compound were not detected in the ground water samples Analytical results of the CPT "grab" ground water samples are summarized in Table 3 I Analytical results of ground water samples are summarized in Table 4 A cross-section depicting the ' general lithology and the approximate distribution of contaminants in the soil beneath the site is illustrated on Figure 3 Maps depicting the approximate distribution of dissolved TPH-g, benzene and MTBE are illustrated on Figures 4, 5 and 6 IThe lateral and vertical extent of impacted soil and the lateral extent of impacted shallow ground water has been defined in all directions The veracal extent of deeper impacted ground water has Ibeen defined toward the north and is fairly well defined in the southern portion of the site Advanced GeoEnvironmental,Inc I