Regulations.gov document: U.S. Environmental Protection Agency. Technologies and Costs for the Removal of Radon from Potable Water Supplies. Fourth Draft. Prepared by Malcolm Pirnie, Inc. Jan. 6, 1987. 106 pp. [EPA, 1987b] [PHASE-III-RADS-III-E1-D1] — retained record — High Signal
Regulations.gov document: U.S. Environmental Protection Agency. Technologies and Costs for the Removal of Radon from Potable Water Supplies. Fourth Draft. Prepared by Malcolm Pirnie, Inc. Jan. 6, 1987. 106 pp. [EPA, 1987b] [PHASE-III-RADS-III-E1-D1]