Corrective Action Investigation Plan for Corrective Action Unit 511: Waste Dumps (Piles & Debris), Nevada Test Site, Nevada, Rev. No.: 0 with ROTC 1

This Corrective Action Investigation Plan for Corrective Action Unit 511: Waste Dumps (Piles & Debris), Nevada Test Site, Nevada, has been developed in accordance with the Federal Facility Agreement and Consent Order that was agreed to by the State of Nevada, U.S. Department of Energy, and the U.S. Department of Defense. The general purpose of the investigation is to ensure adequate data are collected to provide sufficient and reliable information to identify, evaluate, and select viable corrective actions. This Corrective Action Investigation Plan provides investigative details for CAU 511, whereas programmatic aspects of this project are discussed in the ''Project Management Plan'' (DOE/NV, 1994). General field and laboratory quality assurance and quality control issues are presented in the ''Industrial Sites Quality Assurance Project Plan'' (NNSA/NV, 2002). Health and safety aspects of the project are documented in the current version of the Environmental Engineering Services Contractor's Health and Safety Plan and will be supplemented with a site-specific safety basis document. Corrective Action Unit 511 is comprised of the following nine corrective action sites in Nevada Test Site Areas 3, 4, 6, 7, 18, and 19: (1) 03-08-02, Waste Dump (Piles & Debris); (2) 03-99-11, Waste Dump (Piles); (3) 03-99-12, Waste Dump (Piles & Debris); (4) 04-99-04, Contaminated Trench/Berm; (5) 06-16-01, Waste Dump (Piles & Debris); (6) 06-17-02, Scattered Ordnance/Automatic Weapons Range; (7) 07-08-01, Contaminated Mound; (8) 18-99-10, Ammunition Dump; and (9) 19-19-03, Waste Dump (Piles & Debris). Corrective Action Sites 18-99-10 and 19-19-03 were identified after a review of the ''1992 RCRA Part B Permit Application for Waste Management Activities at the Nevada Test Site, Volume IV, Section L Potential Solid Waste Management Unit'' (DOE/NV, 1992). The remaining seven sites were first identified in the 1991 Reynolds Electrical & Engineering Co., Inc. document entitled, ''Nevada Test Site Inventory of Inactive and Abandoned Facilities and Waste Sites''. The seven-step data quality objectives (DQO) process was used to identify and define the type, quantity, and quality of data needed to complete the investigation phase of the corrective action process. The DQOs address the primary problem that sufficient information is not available to determine the appropriate corrective action for the CASs. Corrective action closure alternatives (i.e., no further action, close in place, or clean closure) will be recommended for CAU 511 based on an evaluation of all the DQO required data. Under the ''Federal Facility Agreement and Consent Order'', the Corrective Action Investigation Plan will be submitted to the Nevada Division of Environmental Protection for approval. Field work will be conducted following approval of the plan. The results of the field investigation will support a defensible evaluation of corrective action alternatives that will be presented in the Corrective Action Decision Document.