2. Wastewater TMDL Modification01.z'• ��.k ry�.4{, *�:v":x �kN.3 Vic..
City of Kali*spell
:._.._: :... Post Office Box 1 - Kalispell, Montana 3-1 7 - Telephone ) - Fax - 758-775
REPORT TOO Honorable Mayor and City Council
FROM; James H. Patrick, City Manager
SUBJECT: Total Maximum Daily Limits TM Discussion
MEETING DATE: February 6, 2006
BACKGROUND: At the January 30 th Fifth Monday meeting, Joe Russell made a
presentation on M 's in Flathead County. Attached please find a copy of a presentation
made by our consultants. This will be the basis for our discussion at the work shop. Staff` and
along with the City Engineer from whitefish had an opportunity to meet with the Director o
Environmental Quality on Tuesday. He assured us that the cities would have representation on
the technical advisory Committee and be part of determiningn implementation plan.
RIECOMMEN TION: The City continues to work witb DEQ to insure that the
implementation plan is equally enforced on all entities contributing to the total nutrient loadings
in Flathead Lake.
FISCAL EFFECTS: Potentially significant expenditures of funds.
ALTERNATIVES: s suggested by the City Council .
Respectfully submitted,
.Tames H. Patrick, City Manager
Nutrient Management Plan and
Total Maximum Daily Load for
Flathead Lake
David L. Clark and Craig Caprara
R Engineering, Inc*
January 23, 2006
Nutrient Management Plan and Total
Maximum Daily Load for Flathead
Lake
• Water Quality
Gels/Endpoints for
Flathead Lake
No declining dissolved
oxygen in the hypoftnion
No measurable blooms of
nabaena or other
pollution algae
Stable or declining tread in
algal biomass on near -
shore rocks
Water Qualms Indicators
�- Primary productivity: 80
/m2/year
Total phosphorus: 5.0 ug/1
Sle reactive
phosphorus: 11
Total nitrogen: 95 u 11
Nitrate and nitrite nitrogent.
30 ui1
Ammonia nitrogen: <1 .
Ug/1
Chlorophyll a: 1 .0 u 1
1
Total Maximum Daily Load Allocates
Load Reductions in 2 Phases
• Phase I: A 25 percent reduction in nutrient
loading from the core urban and agricultural
area north of the fake
TMDL calls for 15 percent reduction in man -caused
nitrogen and phosphorus loads, plus a 10 percent
margin of safety
— Kalispell, Whi#efish, Columbia Falls, Biqa fork,
Evergreen, Somors, and Creston Identified for Interim
Load Reduction Goal
• Phase 11: Concurrently collect additions[ data
from all nutrient sources
A final nutrient lead allocation is to be made in 2006
MDEQ Currently Formulating Plans for Phase it
Nutrient Management Plan Potential
Issues
Water Quality Targets Are Clear
Recognition that Point Source loadings Area Small
Total Phosphorus (-I%
- Total Nan - 2%
Final Load Allocations Not Yet Developed
- TMDL states that "It is net envisioned that achieving a 2 % load
reduction from this OnVe l area MY teain achieving the overall
15%
basin wide load md. Rathej, this is an interim ked reduce goal
for an area known to be an immediate for at to Flathead Lake."
• Point Source and Nonpoint Source Reduction Requirements Not Yet
Defined
M L states that "The intent of this affoca6on appa h is to begin
tat actions toward reducing pollutant loads, a described above In
Phase 1, while concurrently collecUng addftnal information In Phase H.
This additional informahon will ultimately allow for fain and equitable
alto bon of the total antbropogenic load. "
2
TES. - : P. .oint Source Nutrient �
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Figure 4.7. Phosphorus Load b Source Category.
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Figure 44. Total Nitrogen Load by Source Category.
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