HomeMy WebLinkAboutPublic Utilities Committee Minutes 05.09.1994MINUTES
PUBLIC UTILITIES COMMITTEE
May 9, 1994 5:30 p.m.
MEMBERS PRESENT: Albert Ehrlick Ron Marshall
Phil Curry Mel Baker
Dave Michael Bob Graham
John Minch Sharon Herman
Bob Graham presented a proposal from B-S Partnership about a
proposed reservoir site in the portion of NE 1/4, Section 5, T-2N,
R-24E, Yellowstone County and located west of Beartooth View
Subdivision.
Discussion of said site. B-S Partnership would give the City: 1)
approximately one square block (300' X 300') located on the highest
point of said property.
2) Sixty (60) feet of right-of-way across said property from the
east property line to reservoir site.
The City would acquire and let the B-S Partnership use: 1) A
right-of-way across property between Beartooth Drive and the east
propertt line of B-S Partnership for access. 2) The City would
allow °tapsto the City water main to the new proposed reservoir
for the use of B-S Partnership's residence when the reservoir and
water main are constructed in the future.
Motion by Albert Ehrlick, seconded by Ron Marshall, to allow
B-S Partnership to use the right-of-way for access acquired by the
City across the property between Beartooth Drive and the east
property line of said property, and allow one service tap for a
residence of B-S Partnership in return for a proposed reservoir
site and right-of-way between the reservoir site and the east
property line. Motion carried.
Respectfully submitted,
Dave Michael
•
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reservoir would provide a more dependable backup and also
help alleviate low pressure areas within the City.
Recommendations: Construct a new reservoir to serve a
second pressure zone. Provide a
that can be used to tie the two pressure reducing valve
pressure zones together and
consequently allow the upper reservoir to act as a backup
to the lower reservoir.
6.. Numerous line breaks on Sixth Avenue, East Fifth Street,
West First Street, Colorado Avenue and Montana,Avenue.
Recommendation: The 4-inch line on Sixth Avenue hs been
replaced with an 8-inch line which will eliminateafuture
breaks due to the corroded pipe and. will also help in the
flow distribution.
The following line sizes
recommended for replacing the remaining lines. are
a. East Fifth Street
- 8 inch
b. West First Street
- 6 inch
c• Colorado Avenue
6 inch
d• Montana Avenue
- 6 inch
7. The Cherry Hill and Valley Drive areas have insufficient
pressure.
Recommendation: An upper reservoir should be constructed
to serve a second
pressure zone. The second pressure
should include zone
the Cherry il
vision, Malit
subdivision, as well as an area Northeast
generall of the City
Y lying above the Big Ditch, and an area West of
the City including the Rockwell Schauer subdivision.
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Opacity is computed below.
Table VII-1
REQUIRED STORAGE FOR FUTURE SYSTEM
Peak Storage
0.40 x 6.54 MG = 2.616 MG
Fire Flow
3500 GPM x 240 minutes = 0.840 MG
Emergency Reserve
0.25 x 6.54 = 1,635 MG
Total Required Storage Volume 5.091 MG
The City's current storage capacity consists of a 3.97 million
gallon reservoir on the north side of town and 0.25 million
gallons of storage at the water treatment plant. This gives
the City 4.22 million gallons of the recommended 5.091 million
gallons of storage capacity. On this basis the storage
capacity of the upper reservoir should be 0.87 million
gallons. This method of analysis considers the required
storage capacity of the entire distribution system bu t it is
not specific to the requirements of the individual pressure
zones. For example, the capacity of the existing r eservoir
would not benefit Zone 2 if the booster station was out of
service. Because of this a separate analysis of the storage
requirements for Zone 2 was conducted.
e Recommended Standards.for Water Works--1982 suggests that
e minimum recommended capacity for a storage reservoir should
equal to the average daily consumption plus the required
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reservoir is being used as a backup reservoir for Zone 1, the
pressure reducing station would be employed to tie the pressure
zones together and yet prevent excessively high pressures from
occurring in the lower pressure zone (Zone 1).
The location of the new reservoir is critical in establishing
the system pressure in Zone 2. In order to avoid pressures
over 90 psig in Zone 2 the maximum water elevation for the
reservoir is 3540 feet. Assuming a 20 foot high tank the tank
bottom elevation will be 3520 feet. The pressure limit in Zone
2 does not allow the Beartooth Drive area, or the Groshelle
Heights area to be included in Zone 2. The high elevation in
these areas requires a third pressure zone and associated
booster station.
In addition to the proposed reservoir, other improvements
proposed for zone 2 include: a) a distribution loop east of
Laurel, b) a distribution loop for the Cherry Hill, Malit
subdivision, and Murray Park area, c) a new line down valley
Drive d) a distribution loop west of Laurel in the Rockwell
Schauer subdivision area and e) a new service line between
Thirteenth Street and Twelfth Street on Fifth Avenue that
parallels the main distribution line.
D PRES URE ZONE 3
High elevations in the northern part of the proposed service
area requires a third pressure zone be established. Areas
above an elevation of approximately 3440 feet should be
included in Zone 3. This represents all the land in the
service area above Cove ditch. This area currently contains
two platted subdivisions, Beartooth View and Groshelle Heights,
With approximately 42 total lots. Based on RE 20,000 zoning
the maximum potential population of Zone 3 is 1,674 which
results in a potential peak day flow of 780,284 gallons per day
°r 542 gallons per minute.
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