PROPOSED DISCHARGE OF DREDGED OR FILL MATERIAL TO SILVER LAKE

Wyoming Department of Environmental Quality  | view as a webpage

Wyoming Department of Environmental Quality

Public Notice: PROPOSED DISCHARGE OF DREDGED OR FILL MATERIAL TO SILVER LAKE

The Wyoming Department of Environmental Quality (WDEQ) has received a request from the Western EcoSystems Technology, Inc. on behalf of the Silver Lake Irrigation District for State certification of U.S. Army Corps of Engineers (USACE) Nationwide Permit #6, for discharge of dredged or fill material to Silver Lake near Boulder, Wyoming. The project involves geotechnical survey work for future reconstruction/rehabilitation of the dam. Silver Lake is designated a Class 1 water where point source discharges are prohibited except for storm water and construction related discharges. This certification will require meeting the provisions in Chapter 1, Section 7(b) of the WDEQ Water Quality Rules and Regulations, which allows these discharges under certain circumstances.

Proposed geotechnical survey activities include collection of approximately 50 core samples at the dam, 10 test pit samples at proposed borrow material areas and repair work. Bore holes would be backfilled with grout whereas test pit sample locations would be backfilled with excavated material and re-contoured. Repair work includes stabilizing the concrete inlet structure and removing material blocking the outlet pipe. Work will be performed in the dry after lake drawdown.

Requests for information about the proposed water quality certification should be directed to Eric Hargett by email (eric.hargett@wyo.gov) or phone (307-777-6701). Comments must be addressed to Eric Hargett, Wyoming DEQ/WQD, 200 W. 17th Street – 4TH floor, Cheyenne, WY, 82002, and be postmarked on or before 5:00 p.m. on June 26, 2020 to be considered. Phone or email comments will not be accepted. Para español, visite deq.wyoming.gov.