ARCHIVED REPORTS_XR0005086 - Laserfiche WebLink

Home Browse Search

' through B-4 at concentrations as high as 16,000 micrograms per liter • ( and 110,000 99/1 in sample B-2, respectively. Various TEX compounds l except benzene ' were detected in all groundwater samples at a maximum concentration of 1,400µg/1 zylenes, in sample B-1. The fuel oxygenating compounds MTBE and tert-Butanol were detected in sample B-4 at concentrations of 19 µg/1 and 80 µg/l, respectively. The lead scavenger 1, 2- dichloroethane(1,2-DCA)was detected in sample B-4-at 0.59 ug/l. ' On 09 and 10 December 1999, five soil borings were advanced at the site to a depth of 35 feet below surface grade (bsg) for installation of monitoring wells MW-1 through MW-5. • TPH-g and TPH-mo were detected in the soil sample collected at 20 feet bsg in pilot boring ' MW-4 at concentrations of 160 mg/kg and 4.7 mg/kg, respectively; TPH-mo was detected in borings MW-I at 25 feet bsg and MW-5 at 20 feet bsg at' concentrations of 5.7 mg/kg,and 7.5 mg/kg, respectively.MTBE and BTEX compounds were not detected above laboratory reporting limits in any of the soil samples collected and analyzed. ' On 30 and 31 October2001,foursoil borings were advanced at the site far installation ofmonitoring wells MW-6 and MW-8 through MW-10. MW-8 through MW-10 were advanced to a depth of 35 feet below surface grade (bsg); MW-5 was advanced to 50 feet bsg, ' TPH-g was detected in soil sample MW-8-30 and MW-9-20 at concentrations milligrams per kilograms m of 15 and 130 gr p t (mg/kg),respectively,TPH-d was detected in soil sample MW-6- '• 35 and MW-9-20 at concentrations of 1.2 and 150 mg/kg, respectively, and TPH-mo was detected in sample MW-9-20 at 10 mg/kg; no petroleum hydrocarbon compounds were detected in any of the soil samples analyzed from boring MW-10. The BTEX compounds ' toluene, ethylbenzene and xylenes were detected in soil samples MW-6-35, MW-8-30 and MW-9-20 at maximum concentrations of 0.093 mg/kg, 0.83 mg/kg and 0.7 mg/kg, respectively, in the sample from MW-9-20. In addition, MTBE was detected at a ' concentration of 0.0075 mg/kg in soil sample MW-9-25. ' On 25 February 2002, one additional ground water monitoring well to a depth of 35 feet bsg. A total of 3 soil samples were submitted for analysis as installed on-site • No analytes were detected at or above laboratory reporting Iimits in the soil samples ' analyzed, ' The vertical extent of impacted soil and ground water has been defined. The lateral extent has been mostly defined, except towards the north/northwest; however, based on soil analytical results at MW-3, MW-8 and MW-9 (e.g., apparent deeper contamination at MW-8 versus MW-3 and the presence of MTBE in MW-9), AGE believes that there may be adjacent sites providing or contributing to the contamination detected in northernmost wells MW-8 and MW-9. Advanced GeoEnvi ro n mental,Inc.