Final Report - Flathead County, Montana

More documents

Recommendations

Info

B. Lift Stations: As mentioned there are a total of 16 “major” lift stations located throughout the District and a list of these lift stations can be seen in Table BF-3. Bigfork LS # Table BF-3 – Bigfork Water & Sewer District Lift Stations Station Name 1 Bay 2 Sunset Type Duplex - Submersible Gorman Rupp Duplex - Submersible Gorman Rupp Hp - Each Pump Capacity (gpm) Max. Number EDUs Served Max. Pop. Served 2 80 126 280 5 265 453 1,006 3 Beach Duplex - Submersible 1 100 160 356 4 Lodge 5 Jones 6 7 8 Duplex - Self-Prime Hydronix Duplex - Self-Prime Hydronix Harbor Duplex - Self-Prime Village #1 Gorman Rupp Harbor Duplex - Self-Prime Village #2 Gorman Rupp Harbor Duplex - Self-Prime Village #3 Gorman Rupp 9 Lake Pointe 10 Bear Hollow 11 12 Duplex - Self-Prime Gorman Rupp Duplex - Self-Prime Gorman Rupp Eagle Bend 5 Pumps - Submersible North Myers Eagle Bend Triplex - Submersible South Myers 13 North Sewer 14 Saddlehorn 15 Mayport 16 WWTF Duplex - Self-Prime Gorman Rupp Duplex - Self-Prime Gorman Rupp Duplex - Submersible Gorman Rupp Triplex - Flooded Suction Cornell 7.5 180 299 664 3 80 126 280 3 155 254 564 5 130 212 470 5 155 254 564 5 141 230 510 5 145 238 528 7.5 180 299 664 5 150 247 548 10 155 254 564 15 200 335 744 2.7 80 126 280 10 1,000 2,216 4,920 Sewage Treatment in the <strong>Flathead</strong> Basin 14
The lift station capacities in Table BF-3 represent the capacity of the respective lift stations with the largest pump out of service. Assuming the lift station capacity must be capable of meeting the peak flow from the service area, the maximum number of equivalent dwelling units (EDUs) and the maximum population were calculated using a wastewater flow of 100 gallons per capita per day, 2.22 persons per EDU based on 2010 census data, and a peaking factor (ratio of peak hourly flow to design average flow) based on the MDEQ Circular DEQ 2 equation (18 + P 0.5 )/(4 + P 0.5 ) where population “P” is in thousands. Rather than calculating peak flow from a known population as is most commonly done, the maximum population was calculated based on the known peak flow or the known capacities of the various lift stations. C. Force Mains: The size, type and length of a sewer force main can limit the pumping capacity of a lift station or cause larger horsepower pumps to be installed to increase capacity and to overcome the increased total dynamic loss due to friction. An undersized force main can lead to a very inefficient pumping system. Force mains, from “major” lift stations within the District range from 4” to 8” in size. The only 8” force main is from the WWTF Lift Station to the actual treatment facility headworks. There are also several low pressure grinder pump systems with small diameter force mains – 1 1/2” and 2” in size; however, these force mains only serve a small number of residences and are not intended for expansion to serve a broader area. Of the force mains that convey wastewater from major lift stations, only the force main from the Sunset Lift Station would seem to be undersized. At a station capacity of 265 gpm, a 6”, rather than a 4” force main, would appear to be hydraulically a better fit. However, this force main is very short in length and the additional loss in total dynamic head (TDH) does not significantly affect station capacity. CAPACITY TO SERVE AREAS OUTSIDE OF EXISTING SERVICE AREA: With the soon to be completed construction of the new WWTF, the Bigfork Water & Sewer District will have adequate capacity to treat wastewater from areas outside of the existing service area. The District’s lift stations and force mains appear to have sufficient capacities to handle the existing developed lots and undeveloped lots within their respective service areas and sufficient reserve capacity to handle a moderate amount of existing or proposed development outside of their respective service areas. Figure BF-1 shows the current Bigfork Water & Sewer District service area and the locations of existing septic systems adjacent to the District. A larger (24” x 36”) drawing of the Bigfork service area (Exhibit BF-1) is included at the end of this report. What does restrict the conveyance of wastewater to the WWTF, from specific areas in and around the District boundaries, is the gravity collection system. This was Sewage Treatment in the <strong>Flathead</strong> Basin 15
Page 2 and 3: TABLE OF CONTENTS 1 Requirements fo
Page 4 and 5: List of Exhibits (All 24” x 36”
Page 6 and 7: Prepare a map showing location of p
Page 8: Again, we would like to thank all o
Page 12 and 13: DESCRIPTION: BIG MOUNTAIN SEWER DIS
Page 14 and 15: The “Future” EDUs can be debate
Page 16 and 17: DEVELOPMENT OUTSIDE OF DISTRICT: Th
Page 18 and 19: DESCRIPTION: BIGFORK WATER & SEWER
Page 20 and 21: population projections shown in Tab
Page 24 and 25: discussed earlier in this report an
Page 26 and 27: ECHO LAKE HIGHWAY 35 8" 8" 8" 8"
Page 28 and 29: City sewer by 2015. In the 2006 Uti
Page 30 and 31: CAPACITY TO SERVE AREAS OUTSIDE OF
Page 32 and 33: Area. There are a number of existin
Page 34 and 35: MT HIGHWAY 40 RAIL ROAD US HIGHWAY
Page 36 and 37: IRRIGATION PIVOT WASTEWATER TREATME
Page 38 and 39: mains were located in the commercia
Page 40 and 41: Average daily sewage flow for the 1
Page 42 and 43: B. Septic Tank Effluent Gravity Col
Page 44 and 45: Table EG-6 - Evergreen Lift Station
Page 46 and 47: The number of existing EDUs served
Page 48 and 49: By policy, the Evergreen District d
Page 50 and 51: STILLWATER RIVER COUNTRY VILLAGE WE
Page 52 and 53: DESCRIPTION: CITY OF KALISPELL The
Page 54 and 55: eturned to the bioreactors and DAF
Page 56 and 57: continues west and north to Meridia
Page 58 and 59: Minimum grade in the 18” gravity
Page 60 and 61: developments did connect to Line D,
Page 62 and 63: Sta. # Location 5 Kelly Road and Ea
Page 64 and 65: According to HDR’s Facility Plan
Page 66 and 67: Two Mile Drive / Highway 2 West / W
Page 68 and 69: Foys Lake Road / Whalebone Drive Co
Page 70 and 71: LS #32 LS #35 EVERGREEN WATER AND S
Page 72 and 73:
developments, up to the limits of t
Page 74 and 75:
The other sections of gravity sewer
Page 76 and 77:
Table LS-2 - Lakeside County Water
Page 78 and 79:
Storage Pond Capacity - The maximum
Page 80 and 81:
WASTEWATER TREATMENT 10 10 text tex
Page 82 and 83:
8 8 8 8 10" FORCE MAIN 8 8 LS #15FH
Page 84 and 85:
DESCRIPTION: MEADOW LAKE WATER & SE
Page 86 and 87:
existing and future demands. Althou
Page 88 and 89:
The major “trunk” or “interce
Page 90 and 91:
DESCRIPTION: CITY OF POLSON The Cit
Page 92 and 93:
Table PO-1 - City of Polson Sewage
Page 94 and 95:
lagoons through a 12” force main.
Page 96 and 97:
West Shore Lift Station: This 6”
Page 98 and 99:
There are a few businesses, includi
Page 100 and 101:
DESCRIPTION: SOMERS WATER & SEWER D
Page 102 and 103:
Table WF-1 - Predicted Service Area
Page 104 and 105:
Table WF-3 - Pipe Materials and Len
Page 106 and 107:
Table WF-4 - City of Whitefish Lift
Page 108 and 109:
associated wastewater flows, will l
Page 110 and 111:
Lion Mountain: The Lion Mountain Su
Page 112 and 113:
SKYLES LAKE WHITEFISH HILLS LION MT
Page 114 and 115:
Lake County Septics Lake County Par
Page 116 and 117:
treatment, as well as the proper si
Page 118 and 119:
1960’s, with approximately 18,000
Page 120 and 121:
Table SS-2 - Constituent Mass Loadi
Page 122 and 123:
vehicle inspections, and they respo
Page 124 and 125:
economical method of handling septa
Page 126 and 127:
flood lower level floors. This cons
Page 128 and 129:
Sewage Treatment in the Flathead Ba
Page 130 and 131:
PERMITTING AND COMPLIANCE DIVISION
Page 132 and 133:
SEPTIC PUMPER NEW DISPOSAL SITE APP
Page 134 and 135:
SEPTIC TANK, CESSPOOL, AND PRIVY CL
Page 136:
STP License #: Business Name: SEPTI
show all

Final Report - Flathead County, Montana

Create successful ePaper yourself

Delete template?

Save as template?