Streamlined Approach For Environmental Restoration Plan For Corrective Action Units 530 531 532 533 534 And 535 Nevada Test Site Mud Pits Nevada Test Site Nevada Revision 0 With Rotc 1 And 2

This Streamlined Approach for Environmental Restoration (SAFER) Plan addresses closure for the following six corrective action units (CAUs) identified in the ''Federal Facility Agreement and Consent Order'' (1996): (1) CAU 530 - LANL Preshot Mud Pits; (2) CAU 531 - LANL Postshot Mud Pits; (3) CAU 532 - LLNL Preshot Mud Pits; (4) CAU 533 - LLNL Postshot Mud Pits; (5) CAU 534 - Exploratory/Instrumentation Mud Pits; and (6) CAU 535 - Mud Pits/Disposal Areas. Corrective Action Units 530-535 consist of corrective action sites (CASs) located in Areas 1-10, 14, 17, 19, and 20 of the Nevada Test Site (NTS). This plan provides the approach for activities needed to gather the necessary information for closing all the CASs within these CAUs. There is sufficient information and process knowledge from historical documentation and investigations of similar sites regarding the expected nature and extent of potential contaminants to recommend closure of all CASs within CAUs 530-535 using the SAFER process. The Data Quality Objective (DQO) process utilized in this investigation follows the approved risk-based closure strategy outlined in the ''Mud Pit Risk-Based Closure Strategy Report'' (NNSA/NSO, 2004b). The closure strategy was developed based on available information including historical documentation of process knowledge, analytical results from previous sampling activities for contaminants of potential concern at similar mud pits located at the NTS and at off-site locations, future land-use scenarios for each NTS area, and potential exposure scenarios along with the calculated risk for human and ecological receptors.