This is the second revision of the Data Quality Objectives (DQO) Supporting Radiological Air Emissions Monitoring for the Pacific Northwest National Laboratory (PNNL) Richland Campus. In January 2017, the PNNL Richland Campus expanded to the north by 0.35 km 2 (85.6 acres). Under the requirements of Washington State Department of Health (WDOH) Radioactive Air Emissions License (RAEL)-005, the PNNL Campus must operate and maintain a radiological air monitoring program. This revision documents and evaluates the newly acquired acreage while also removing recreational land at the southwest, and also re-examines all active radioactive emission units on the PNNL Campus. No buildings are located on this new Campus land, which was transferred from the U.S. Department of Energy (DOE) Hanford Site. Additionally, this revision includes information regarding the background monitoring station PNL-5 in Benton City, Washington, which became active in October 2016, thereby eliminating the use of the Hanford Site's Yakima Station for background data. The key purpose of this revision is to determine the adequacy of the existing environmental surveillance stations to monitor radiological air emissions in light of this northern boundary change. Revision Number Effective Date Description of Change 0 May 2010 Initial document describing the initial development of the WDOH-prescribed ambient radiological surveillance program for the PNNL Site. Three particulate monitoring stations were recommended for siting (PNL-1, PNL-2, and PNL-3).