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WEST BABCOCK, (HRDC) SUBDIVISION
SEWER AND WATER MAIN PAYBACKS
May 5, 1994
Compiled for the HRDC and City of Bozeman
by
The City of Bozeman Engineering Department
Page 1
Introduction
In the spring of 1994, the West Babcock Subdivision was constructed
through the coordinated efforts of the Human Resource Development
Council and the City of Bozeman, for the purpose of providing a low
income housing subdivision. Offsite sewer and water infrastructure
was needed to serve the subdivision and as decided by the City
Commission, the cost of these additional utilities would be "paid
back" to the "owner" by future connecters to the lines, through a
payback arrangement.
HRDC Sewer Payback Area
Two areas are delineated for the 10" sewer main constructed from
the north edge of the HRDC subdivision to the intersection of N.
25th and Durston Rd.. One is the 118" Equivalent Payback Area" and
the other, the 1110" Oversize Payback Area". The 811 equivalent area
represents the most likely lots to directly connect to the main,
therefore responsible for the majority of the payback amount. The
10" oversize area represents the area benefiting by the extension
of the 10" main, though not directly connecting to it.
The areas exclude present and projected Rights of Ways, present and
projected openspace and parks, leaving only present and projected
lot area. Table 1 describes the properties in the payback areas
and the methods used to calculate the areas.
HRDC Water Payback Area
Two payback areas were developed for the water mains required to
service the HRDC Subdivision. A 10" main was constructed in
Durston Rd., from the west edge of West Park Manor Phase 4
Subdivision to the intersection of N. 25th and Durston. An 8" main
was constructed from the north boundary of the HRDC subdivision to
the intersection of N. 25th and Durston. The boundaries depicted
on Exhibit 2, are the areas most likely to seek connection to these
water mains in the future. The 8" water main payback area contains
approximately 6.9 acres and the 10" water main payback area
contains approximately 30 acres. These areas exclude present and
projected Rights of Ways, parks and openspaces. Table 2 describes
the properties in the payback areas and the methods of calculating
the area.
Page 2
Cost of the HRDC Water and Sewer Mains
The infrastructure for the HRDC subdivision was designed and
construction services provided by Morrison-Maierle/OSSA. The
project contractor was Johnston Excavating. Table 3 illustrates
the quantities and costs of the bid items to be "paid back", as
well as the proportional costs of engineering and inspection.
Total sewer payback amount is estimated at $29,532. Total water
payback amounts are estimated at; $41,761 for the 8" main and
$27,035 for the 10" main. Final amounts will be determined
following completion of construction of the HRDC Subdivision.
Method of Assessment
The areas calculated as the payback areas are approximate only.
Actual assessments will vary depending on final platted lot sizes.
Payback amounts will be collected in addition to regular costs of
sewer and/or water hookup for those properties within the described
payback boundaries. The amount will be collected at the time the
customer applies for sewer or water service. All other costs of
construction of sewer and water services will be borne by the
applicant.
The sewer payback amounts are $0.10 per square foot of platted lot
within the 8" equivalent payback area and $0.002 per square foot of
platted lot within the 10" oversize area. The water payback
amounts are $0.138 per square foot of platted lot within the 8"
main payback area and $0.021 per square foot of any platted lot
within the 10" main payback area.
TABLE 1
HRDC. (WEST BABCOCK) SUBDIVISION SEWER PAYBACK CALCULATION
* Acreages used in calculations represent platted and future
platted lots, (no R.O.W., open space, or parks included).
See Exhibit for boundaries of payback area
SUBDIVISION
OR
PLAT
SOURCE
OF
INFORMATION
ACREAGE OF
LOTS IN 8' EQUIV.
P.B. AREA
ACREAGE OF
LOTS IN OVERSIZE
P.B. AREA
Kable Subdivision
Plat
3.93
Simpkins Subdivision
Plat + County Appraiser
2.42
Egbert Subdivision
Plat + County Appraiser
1.36
HRDC, (West Babcock) Subdivision
Proposed Final Plat
4.85
Fellows Property, Unplatted
COS 1817 + Scaling
2.47
0.52
Lessley Property, Unplatted
Scaling + Tax Roll
7.77
Neibauer Property, Unplatted
Surrounding Plats
3.56
TOTAL LOTS
6.40
20.48
8" Equivalent Sewer Payback for platted or projected lot: $27,754.05/6.4 ac = $0.10/sf
10" Oversize Sewer Payback for platted or projected lot: $1,778.40/20.48 ac = $0.002/sf
TABLE 2
HQDC, 1_WEST BABCOCK) SUBDIVISION WATER PAYBACK CALCULATIONS
* Acreages used in calculations represent platted and future
platted lots, (no R.O.W., open space, or parks included).
See Exhibit for boundaries of payback areas
SUBDIVISION
SOURCE
ACREAGE OF
ACREAGE OF
OR
OF
LOTS FOR
LOTS FOR
PLAT
INFORMATION
8' MAIN P.B.
10' MAIN P.B.
Kable Subdivision
Plat
3.93
3.93
Fellows Property, Unplatted
COS 1817 + Scaling
2.47
13.58
Lessley Property, Unplatted
Scaling + Tax Roll
1.70
Smith Property, Unplatted
Proposed Annie Sub. Ph. II
9.78
TOTAL LOTS
6.40
28.99
8" Water Payback for Platted or Projected Lot: $41,761.31/6.40=$6525.20/ac = $0.15/sf
10" Water Payback for Platted or Projected Lot: 527.034.50/28.99=$932.55/ac = $0.021/sf
ABLE 3
HRDC EST BABCOC SUBDIVISION SEWER AND WATER PAYBACK COST ESTIMATE
Unit Costs from Johnston Excavating's Low Bid
* Engineering and Inspection proportionaly based on
Morrison -Maierle/CSSA Professional Services Contract/Cost Estimate
San. Sewer Sta 0+00 - 15+46
ITEM
UNIT
EST.
UNIT PRICE
EST.
ACT.
ACT
If
31.5 $16.74
QTY
Hydrant Assembly
TOTAL
QTY
TOTAL
10" PVC
If
1546
$12.30
$19,015.80
ea
$0.00
T-2 Bedding
cy
81
$0.15
$12.15
1 $75.00
$0.00
Pipe Insulation
ea
1
$75.00
$75.00
$4,813.001
$0.00
Std. 5'-0" Manhole
ea
4
$1,475.00
$5,900.00
TOTAL WATER
$0.00
Manhole additional vert. feet
of
6.95
$90.00
$625.50
$0.00
Connection at Durston
ea
1
$500.00
$500.00
$0.00
Engineering & Inspection*
1-
-
$3,404.00
$3,404.001
1 $0.00
TOTAL SEWER**
1
$29,532.45
$0.00
8" PVC
If
$11.15
**Total for 8" equivalent system = $27,754.05
**Oversizing cost for the 10" main = $1.778.40
8' Water Sta 8+18 - 23+60
8" D.I.P.
If
1572 $18.00
$28,296.00
$14,268.00 $0.00
$0.00
6" D.I.P.
If
31.5 $16.74
$527.31
Hydrant Assembly
$0.00
Hydrant Assembly
ea
3 $1,600.00
$4,800.00
ea
$0.00
8" G.V.
ea
5 $650.00
$3,250.00
1
$0.00
Pipe Insulation
ea
1 $75.00
$75.00
$1,400.00
$0.00
Engineering & Inspection*
-
-1 $4,813.00
$4,813.001
$3,850.00 $0.00
$0.00
TOTAL W ATE R
-
1
1$41,761.31
TOTAL WATER
$0.00
10' Water Sta 1+42 - 8+18
10" D.I.P.
If
696
$20.50
$14,268.00 $0.00
6" D.I.P.
If
10.5
$16.74
$175.77 $0.00
Hydrant Assembly
ea
1
$1,600.00
$1,600.00 $0.00
10" G.V.
ea
3
$850.00
$2,550.00 $0.00
Pipe Insulation
ea
1
$75.00
$75.00 $0.00
Connection at Durston
ea
1
$1,400.00
$1,400.00 $0.00
Pavement R&R
If
700
$5.50
$3,850.00 $0.00
Engineering & Inspection*
-
$3,115.731
$3.115.731 $0.00
TOTAL WATER
$27,034.50 1 $0.00