Closure Report for Corrective Action Unit 335: Area 6 Injection Well and Drain Pit, Nevada Test Site, Nevada

Abstract

Corrective Action Unit (CAU) 335: Area 6 Injection Well and Drain Pit, is located in Area 6 of the Nevada Test Site (NTS). CAU 335 consists of three Corrective Action Sites (CASs) currently listed in Appendix 111 of the Federal Facility Agreement and Consent Order (FFACO, 1996):. CAS 06-20-01, Drums; Oil Waste; Spill. CAS 06-20-02,20-inch Cased Hole. CAS 06-23-03, Drain Pit CAU 335 was closed in accordance with the FFACO and the Nevada Division of Environmental Protection-approved Corrective Action Plan for CAU 335 (US. Department of Energy, National Nuclear Security Administration Nevada Operations Office [NNSA/NV], 2002). CAU 335 was closed by implementing the following corrective actions:. CAS 06-20-01 is a spill site associated with the storage of material that was pumped out of CAS 06-20-02 and placed into 208-liter (55-gallon) drums. The drums were transported to the NTS Area 5 Hazardous Waste Accumulation Site in 1991 (US. Department of Energy, Nevada Operation Office [ D O E N ] , 2000). Any spills associated with CAS 06-20-01 were addressed and considered part of CAS 06-20-02. CAS 06-20-01 was closed by taking no further action.. CAS 06-20-02 is a 20-inch cased hole that was used for disposal of used motor oil, waste water, and debris for an undetermined amount of time (D O E N , 2000). This site was closed in place with administrative controls. Warning signs were posted along the CAS perimeter and land use restrictions implemented to prevent intrusive activities at the site.. CAS 06-23-03 consists of a drain pit that was used as a depository for effluent waste from truck-washing facilities from 1960 through 1991 (D O E N , 2000). This site was closed in place with administrative controls. The exposed piping in the drain pit berm was grouted closed and the drain pit backfilled with approximately 190 cubic meters (250 cubic yards) of clean fill. Warning signs were posted along the CAS perimeters and land use restrictions implemented to prevent intrusive activities at the site.