DES MOINES — The Water Quality Standards Technical Advisory Committee will meet to discuss three water quality revisions to standards for wasteload allocations. The committee will meet from 9 a.m. to 4 p.m. in the third floor conference room of the Wallace State Office Building, 502 E. Ninth St., Des Moines. The meeting is open to the public.
A wasteload allocation is the maximum amount of pollution capacity a surface water (river, stream or lake) can assimilate each day ― whether that is from an existing source that releases state-permitted discharges or from a future source of discharges ― and still meet applicable state water quality standards. The calculation of a wasteload allocation is based on conservative assumptions to protect the water quality under worst case scenarios.
Committee members will discuss and share information on the following topics:
1) How to establish chemical-specific limits for point source discharges based on desired water quality goals;
2) How to consider the total residual chlorine loss in an allowed mixing zone where there is no serious health risk and no lethality to organisms; and
3) Clarification of how the E. coli sample maximum should be applied and implemented through the state’s water quality standards.
The technical advisory committee, made up of experts in related scientific fields, assists the Iowa DNR by providing advice and input using the best information available.
The meeting agenda, notes and handouts will be posted on the DNR website after the meeting at http://www.iowadnr.gov/InsideDNR/RegulatoryWater/WasteloadAllocations.aspx