SLIDE 1
Ben Rau and Dustin Bilhimer Water quality Program Ecology - - PowerPoint PPT Presentation
Ben Rau and Dustin Bilhimer Water quality Program Ecology - - PowerPoint PPT Presentation
Ben Rau and Dustin Bilhimer Water quality Program Ecology Authorities Thurston County overview Chehalis River Watershed TMDLs Federal Clean Water Act Delegation to Ecology NPDES Permits Section 303d Water Quality
SLIDE 2
SLIDE 3
Federal Clean Water Act
- Delegation to Ecology
- NPDES Permits
- Section 303d
Water Quality Standards TMDLs (Total Maximum Daily Load)
- Section 319-Nonpoint Program
State Water Pollution Control Act
- Authority to administer Federal CWA delegated
roles
- State Waste Discharge Permits
- Discharge Prohibition
SLIDE 4
TMDLs
- Upper Chehalis Bacteria
- Upper Chehalis Temperature
- Upper Chehalis Dissolved Oxygen
- Totten, Eld, and Skookum Inlets Tributaries
- Henderson Inlet Watershed Multiparameter
- Nisqually Watershed Bacteria and DO
- Deschutes River Multiparameter-In Development
SLIDE 5
Summary of Projects and Links to Documents http://www.ecy.wa.gov/programs/wq/tmdl/ChehalisIndex.html
SLIDE 6
Fish-able Dig-able Swim-able Live-able Drink-able Economically Viable Sustainable
SLIDE 7
1996 96 rev.20 2000 00 Upper Chehalis River Basin Dissolved Oxygen TMDL DO, BOD, Ammonia 200 2001 Upper Chehalis River Basin Temperature TMDL Temperature, Effective Shade 200 2004 Upper Chehalis River Bacteria TMDL Fecal Coliform Bacteria 200 2004 The Chehalis/Grays Harbor Watershed Multi-parameter TMDL Detailed Implementation Plan (DIP) DO, Temperature, Fecal Coliform Bacteria
SLIDE 8
Load Allocations for BOD Load Allocations for Ammonia
- The reason for
significant investments in Centralia and Chehalis STPs
- WLA for
WestFarm Foods
- Nonpoint LAs
shown as Percent Reductions needed.
SLIDE 9
- Identified WLA for all existing
point sources
- LA for Nonpoint sources
included reach-based percent riparian shade improvements; and mean tributary width-to- depth ratios to achieve stable and narrower/deeper channels.
SLIDE 10
- Used the Statistical Roll-back method to determine percent
reductions of FCB needed to meet WQ standards.
- LAs for nonpoint sources apply to the LA Compliance Areas (LACAs)
in the map.
SLIDE 11
Expressly identifies role of CBP and Ecology to
coordinate monitoring, evaluate wq monitoring data, and so that progress of implementation actions will occur routinely (p39).
Includes: Management Roles, Activities, and
Schedules, performance measures and targets, monitoring plan, etc.
SLIDE 12
- Land use activities may have specific BMPs needed,
but most all include functioning riparian areas
- Residential parcels in rural areas often include
“hobby farm” activities that need similar BMPs as parcels in more intensive agricultural uses.
SLIDE 13
TMDL Effectiveness Study Approach
- Assess current water quality (wq listing criteria)
- Account for new sources
- Compare current water quality with Load and
Wasteload Allocations… Were targets met?
- Identify where BMP investments were made
- Try to correlate water quality improvements with BMPs
implemented
- Identify Education and Outreach Successes
- Revise allocations to reflect current conditions
Report to EPA and the public
SLIDE 14