300 Area Process Trenches Post Closure Unit Group 1 (PCU-1)

[TSD ID#: D-3-1] Located north of Hanford’s 300 Area, this unit had two trenches, each 1,500 feet long, 15 feet deep, and 10 feet wide at the bottom. The trenches received waste from 1975 through 1994. The unit received up to 2.9 million gallons/day of contaminated waste water from uranium fuel rod production and several laboratories. The groundwater below these trenches is contaminated with organic chemicals.

Enforceable Permit:

Issued in accordance with the applicable provisions of the Hazardous Waste Management Act, Chapter 70.105 Revised Code of Washington (RCW), and the regulations promulgated there under in Chapter 173‑303 Washington Administrative Code (WAC). 

Permit Number: WA7890008967

Unit Specific Conditions


  1. Part A Form
  2. Introduction
  3. Groundwater Monitoring Plan
  4. Closure Contact
  5. Certification of Postclosure
  8. Postclosure Plan

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