ARCHIVED REPORTS_XR0010299 - Laserfiche WebLink

Home Browse Search

remediation of both soil and groundwater is required Fourteen remediation technologies were evaluated according to their performance, reliability, and applicability to the site-specific I conditions Three of the fourteen technologies screened were deemed feasible for remediation of both the impacted site soil and groundwater These technologies included In-Situ Air Sparging, In-Situ Well Aeration, and Enhanced Bioremediation ' Treatibihty and pilot testing should be conducted to further evaluate the best remediation technology for the Canteen Facihty Following evaluation of the pilot test/treatibility data, an estimate of the duration of the clean up time can be provided and the costs for system implementation and operation and maintenance can be finalized In addition, a sensitive receptor survey should be performed 2.0 SOIL ASSESSMENT ACTIVITIES ' 2.1 UST Excavation On March 31, 1992, a 10,000-gallon UST, which had contained gasohne, was removed from the site Samples from the excavated soil revealed concentrations of toluene, ethylbenzene, xylene, and gasoline range (TPH-G) total petroleum hydrocarbons To allow for full use of the area, the excavated soil was placed back in the tank pit, covered with clean fill and sealed with asphalt On November 5, 1992 the site of the removed UST was excavated for a second time to remove the soil that had been returned to the hole The original removed soil was encountered at a depth ' of five to six feet bgs That material was placed directly on a dump truck and transported to Forward, Inc , a disposal facility Due to the limitations of the excavation equipment being used, work was discontinued even though hydrocarbon staining was still present on the south and east ' walls Soil samples taken from the southeast and south walls revealed concentrations of BTEX and TPH-G The excavation was later filled with clean soil and pea gravel ' 2.2 Soil Boring and Monitor Well Installations On February 1, 1993 sort borings SB-1 through SB-5 were installed around the excavation site ' Hydrocarbon constituents were detected in all five soil borings In addition, hydrocarbon constituents were detected approximately 45 feet below ground surface (bgs) in soil borings SB- 2, SB-3, and SB-4 In May 1993 monitoring wells MW-1 through MW-4 were installed further ' away from the excavation site Benzene, toluene, xylene, and TPH-G were detected in soil samples from all four monitoring wells ' On August 23 and 24, 1994 monitoring wells MW-5, MW-6 and MW-7 were installed No hydrocarbon components were detected in any of the soil samples submitted for analysis, indicating that the limits of the soil impact had been defined to the north, west and south I 2 1