DERR-2024-008204

Overview of the Design and
Construction Activities for Zone B
Slide Show 3 of 3
Mark Atencio
March 17, 2010
(Reminder)
2004 Recommendations
1.Pursue project with Zone B by-product water
discharge to Tailings Impoundment
a.Capital cost increase of $2.9 million
2.Defer Lost Use project components in order to
further study by-product discharge effects to the
GSL.
Zone B Facilities
2009-2010 Activities
•Supported Completion of Great Salt Lake
Selenium Studies & Standard Setting Process
UTAH WATER QUALITY BOARD
Wednesday October 22, 2008
Request for Final Approval of Water Quality
Standards (R317-2) Revisions and Timeline for
Final Adoption:
The changes to R317-2 were approved, with Mr.
Olsen and Ms. Doughty opposed to the
changes.
R317-2-14 Numeric Criteria
Selenium (14) Gilbert Bay (Class 5A) Great Salt
Lake Geometric Mean over Nesting Season
(mg/kg dry wt) 12.5
(14) The selenium water quality standard of 12.5
(mg/kg dry weight) for Gilbert Bay is a tissue
based standard using the complete egg/embryo of
aquatic dependent birds using Gilbert Bay based upon a minimum of five
samples over the nesting season. Assessment procedures are incorporated as a part of this
standard as follows: Egg Concentration Triggers: DWQ Responses Below 5.0 mg/kg: Routine monitoring with
sufficient intensity to determine if selenium concentrations within the Great Salt Lake ecosystem are increasing. 5.0 mg/kg:
Increased monitoring to address data gaps, loadings, and areas of uncertainty identified from initial Great Salt Lake seleniu m
studies. 6.4 mg/kg: Initiation of a Level II Antidegradation review by the State for all discharge permit renewals or new discharge permits to
Great Salt Lake. The Level II Antidegradation review may include an analysis of loading reductions. 9.8 mg/kg: Initiation of preliminary TMDL
studies to evaluate selenium loading sources. 12.5 mg/kg and above: Declare impairment. Formalize and implement TMDL.
Zone B Facilities
2009-2010 Activities
•Waited for the Selenium Standard to be
Adopted prior to Submitting a Permit
Application
Zone B Facilities
2009-2010 Activities
•JVWCD has submitted a UPDES Permit
Application for By-product Discharge to Great
Salt Lake
•In response to concerns expressed by the
Division of Water Quality, JVWCD has modified
its application and submitted additional
information
Photo by CDSD
One of Great Salt Lake’s
Beneficial Uses:
water-oriented wildlife and
their necessary food chain
Permit limits
structured to
protect
wildlife