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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 � . ........ .. ......... ..... WATER LOAD" LOAD" CAPIACI 1n.* i SFlathead...... 5 2 2 ,4 #fir. . �tr.., Columbia Falls Flathead River .4 72 223 36 1-5 4E FlatheadLake Flathead Lake . M2 7 i o VWStation UR.jyS - j f h Fork 1 r . �yy�►urea M �' mat-- y l 1r� A+ T T LS ��yw V+ 'yJ . 1 *PourolV per 3 Figure 4.7. Phosphorus Load b Source Category. w} * _ O Y ' Tj at K IL a � a;T L #y S"re 3 Figure 44. Total Nitrogen Load by Source Category. � � ........ . .� . ........ ... � . : o ! # � - � } � 2 !14 V4. ATOM ■ -4eWW- M W POW NW42W .-*M irrW320 sue% �;Pw;ne seavc o