Wastewater Facility. Treatment. Collection. History. Current Status. Presented by Bruce Bender City Public Works Director

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1 Wastewater Facility Presented by Bruce Bender City Public Works Director reatment Collection History Current Status he WWP was constructed with a capacity of 50 million gallons/day (MGD) WWP upgraded to Secondary reatment, expanded to 85 MGD WWP secondary treatment system was improved with a new aeration system A Voluntary utrient eduction Program (VP) was adopted by the State Department of Environmental Quality, ri-state Council, City/County Health Department, Missoula County Commissioners, City and of Missoula WWP secondary clarifiers were refurbished Plant rated to 90 MGD

2 SS P er mi t Li mi t cbod Per mit Limit VP EDUCIOS Phosphorus itrogen Point source eductions Missoula WWP 49% 52% Discharge in to he Clark Fork iver 83 mgd reatment Levels Solid & Oxygen Demand reatment Levels Ammonia oxicity est Violations MISSOULA WAEWA EAME FACILI Effluent otal Suspended Solids(SS) and carbonaceous Biochemical Oxygen Demand(CBOD) Monthly Averages Permit Limits 30 MISSOULA WAEWA EAME FACILI Effluent Ammonia Monthly Averages mg/l(ss and cbod) Jan-92 Jul-92 Jan-93 Jul-93 Jan-94 Jul-94 Jan-95 Jul-95 Jan-96 Jul-96 Jan-97 Jul-97 Jan-98 Jul-98 Jan-99 Jul-99 Jan-00 Jul-00 Jan-01 Jul-01 Jan-02 Jul-02 Jan-03 Jul-03 Actual Levels mg/l 20 0 Jan-01 May-01 Sep-01 Jan-02 May-02 Sep-02 JA '01 - DEC '03 Effluent Ammonia Jan-03 May-03 Sep-03 JA '92 - DEC '03 Effluent SS SS Permit Limit Effluent cbod cbod Permit Limit WWP expansion and upgrade project began in October 2002 and will be completed by September, 2004

3 Upgrade Wastewater reatment Plant Upgrade $190 million B Biological utrient emoval Date of Photography Plant Upgrade Project Completion: September 2004 Aerial itrogen: View eduction of 242 mg/l to 70 mg/l 52% of reatment Phosphorus: eduction of 34 mg/l to 07 mg/l 49% Plant April 1994 Expansion 9 to 12 mgd 30% increase B IOGE EMOVAL Increased Capacity early 50% Above Current Flow 3000 Lbs/day itrogen 778% OAL EMOVAL mg/d Current Flow Current Capacity B 0 I OU 2 mgd (June September) 0 Current Flow Current Capacity B History ALESAKE VALLE I-90 Current Status ESVE USSELL BW OAGE EA MISSOULA

4 BACOF AHU E USSELL BACOF AHU E USSELL SCO D D M U L L A O A D OH E MULLA O CK CLEMES S O U H A V E BACOF SOUH 3D GHAE E 23D E ESVE S 55H 39th St 14H USSELL USSELL SOUH 3D SOUH 5H SOUH 6H SOUH E WHI GIS E BACOF AHU E E S E V E S BO W AHU E USSELL SCO SCO DUCA D ALESAKE D BACOF AHU E USSELL SCO DUCA D ALESAKE D SCO AK D PA D D D DUCA D LOLO DUCA D ALESA KE D ALESAKE D DUCA D ALESAKE D DE CK Original sewer collection system was built in small areas north and south of the Clark Fork iver with three (3) outfalls discharging raw sewage directly to the river GA CK O H BW OAGE GIS E MIS O G VA BUE M 200 SPDW E EPHES E BOOKS SW GIS U S 93 & 12 LOW MILL CK HILLVIEW W PA UPP MILL 5H LOLO H LOLO 1930 s SOUH 3D BW OAGE GIS E G VA BUE SOUH 3D BW OAGE GIS E G VA BUE SOUH 5H SOUH 6H SOUH 5H SOUH 6H 14H EPHES E 14H EPHES E 5H LOLO 1940 s 5H LOLO 1950 s SOUH 3D BW OAGE GIS E G VA BUE SOUH 3D BW OAGE GIS E G VA BUE SOUH 5H SOUH 6H SOUH 5H SOUH 6H 14H EPHES E 14H EPHES E

5 GHAE E 23D E ESVE S 39th St 14H USSELL S USSELL S SOUH 3D GIS E BACOF SOUH E AHU E E S E V E S SOUH 5H SOUH 6H SCO PA DUCA D ALESA KE D M U L L A O A D BACOF AHU E USSELL D CK OH E GHAE E ESVE S 55H 23D E SCO 39th St 14H SOUH 3D SOUH 5H SOUH 6H GIS E BACOF SOUH E AHU E E S E V E S MULLA O CK CLEMES S O U H A V E SOUH 3D GHAE E ESVE S 55H 23D E SCO 39th St 14H D USSELL USSELL SOUH 3D SOUH 5H SOUH 6H WHI PA GIS E BACOF SOUH E AHU E E S E V E S SCO AK D DUCA D PA D DUCA D LOLO DUCA D ALESAKE D ALESA KE D ALESAKE D DE CK WWP planning study showed that only 40% of the existing homes and businesses in Missoula were connected to the old collector system 60% continued to use cesspools and septic systems that filtrate into the groundwater SOUH 3D BW 5H OAGE GIS E G D VA BUE LOLO 1950 s SOUH 5H SOUH 6H 14H EPHES E BW BO W BW 5H OAGE GIS E MIS O G D VA BUE LOLO 1960 s USSELL S USSELL 5H LOLO EPHES E BW OAGE GIS E G D VA BUE 1970 s EPHES E BOOKS SW GIS WHI AK BOOKS HILLVIEW W SW GIS WHI AK D HILLVIEW W Wastewater Facilities Plan Developed (attlesnake Valley in Service Area) BO W GA CK O 1980 s 5H Missoula Valley s Aquifer became the first federally designated sole source aquifer in EPA egion VIII BOOKS SW GIS EPHES E BW OAGE GIS E MIS O G VA BUE M 200 SPDW E U S 93 & 12 LOW MILL CK HILLVIEW W PA UPP MILL

6 Missoula County O Commissioners and City Council formed the Missoula Valley Water Quality District (MVWQD) G A CK S M U L LA O S he 1990 s ALESA KE D SCO O ES E V E W A DUCA D BO MULL Wastewater Facilities Plan 1999 Update was developed and adopted LOLO 5H D C K O 200 A E E GE M OA VA S E HI GGI E E S EP HE CLEMES USSELL SOU H 6H A HU E BACOF SOUH E 39th St SW D S GI WHI AK USSELL B OO ESVE S KS GIS E SOUH A V E published an Evaluation of Unsewered Areas in Missoula attlesnake Valley ranked o 5 DW SOUH 5H 14H OH E he MVWQD SP MIS O SOUH 3D SOUH 3D BU GE W OU GH D BO WA GHAE E & 12 W HIL LV IEW H PA O K 55H UPP M ILL CK C LO MIL L S 23D E PA 93 U O CK S DUCA D SCO 5H D C K O ALESA KE D October MULL A O LOLO D 200 OU GH A E E M GIS E D S WHI AK GI S H 23D E PA L K 55H CK CK C LO MIL PA WA & 12 W HIL LV IEW GHAE E 93 U BU GE VA OA S E HI GGI E S EP HE USSELL O 23D E L M ILL UPP MIL O SW PA M ILL LO K C 55H KS 39th St WA GHAE E & 12 W UPP H B OO ESVE S HIL LV IEW 93 S O E SOUH E GIS E D A HU E A HU E BACOF S GI WHI AK PA U BACOF ESVE S KS SW SOU H 6H SOUH A V E B OO USSELL 39th St DW SOUH 5H 14H OH E SOUH E SOUH A V E SP MIS O SOUH 3D SOUH 3D EP HE S E USSELL CLEMES OH E 2002 SOU H 6H USSELL DW W E GE 200 A M SP SOUH 5H 14H C K D D OU GH E E GE OA VA S E HI GGI BO MIS O SOUH 3D SOUH 3D BU GE W 5H BO ES E V E LOLO M U L LA O O W W A BO BO MULL S S M U L LA O DUCA D SCO to ALESA KE D G A G A CK S ES E V E CLEMES O Collection Current Quality Infiltration Below ational Standards (50 gallons per capita per day) Video Inspections 8 miles of oldest pipe video eceives an Average Flow within ational Standard per capita served (0 gpcd) inspected in 2002 Approximately 60 feet needs to be repaired (015% requires repair)

7 Maintenance Hydro-Cleaning every 2 years (240 miles) epair Work last 8 years, over 1 mile of pipe replaced at over 150 locations Large Diameter Pipe eplacement Over 8 miles replaced Frequently Asked Questions Federal and State Compliance Q: Does the wastewater system comply with State and Federal environmental review requirements (EPA & MEPA)? A: es,, both the 1984 and 1999 Wastewater Facility Plans completed environmental reviews in accordance with Federal and State regulations Both Plans were approved by State and EPA officials he attlesnake project area was included in both Plans Q: Has the City fully complied with all State and Federal required environmental reviews related to the attlesnake sewer project? A: es, the State completed an Environmental Assessment of community wastewater operations as required by EPA and the Montana Department of Environmental Quality State and Federal environmental review and approval documents are available at the City Wastewater reatment Capacity Q: Has the wastewater plant reached its treatment capacity? 0 A: he Plant can treat 90 million gallons per day (MGD) of raw sewage he Plant currently treats 82 MGD or 91% of its available capacity 83 83% Also, the Plant is undergoing improvements that will expand its capacity to 120 MGD as well as upgrade treatment to the next level (called advanced secondary treatment) hese improvements will be complete in Summer 2004 Q: What happens to capacity when attlesnake properties start connecting? A: here are about 477 properties in the SID boundary At 250 gallons per day of sewage from average households, all 477 properties would add 119,250 gallons of sewage each day his amounts to about 012 MGD of the remaining 080 MGD available capacity at the Plant