HomeMy WebLinkAboutContract--NYS Route 13 Water Main SCLIWC Exhibit A 11-04-14.pdfVillage of Lansing Airport Tank Grid - NYS Route 13 Crossing
Engineer’s Report November 4, 2014
T.G. Miller, P.C. Page 1 of 4
Introduction
There are two existing Village water mains that cross the NYS Route 13 right-of-way to serve
Village customers south of the highway corridor. One crossing, at the Warren Road intersection
is understood to be a 10 inch cast iron pipe and partially installed within a steel casing. This at-
grade intersection does not include deep fills associated with entrance/exit ramps and overpass.
As such, the main on Warren Road is buried at a customary depth. The second crossing,
located adjacent to North Triphammer Road was originally installed at conventional bury depths
prior to the construction of the North Triphammer Road overpass. The embankments
constructed for the overpass interchange place the 8 inch main at significant bury depths which
impede the ability to locate pipe breaks and complete emergency repairs promptly. Both mains
are pressurized from the Airport Tank and are interconnected through other Village mains on
Sheraton Drive and Uptown Road. This portion of the Airport Tank distribution system south of
the highway corridor also supplies customers in the Highgate Circle area through the Highgate
Circle Pressure Reducing Valve (PRV). The PRV is connected to the North Triphammer Road
main via 1,100 feet of 8 inch pipe installed along the northerly boundary of the Sevanna Park
and Lansing West Apartment properties.
In addition to the Village water mains, an 18-inch ductile iron transmission main owned and
operated by the Southern Cayuga Lake Intermunicipal Water Commission (Bolton Point)
crosses beneath NYS Route 13 at a location approximately 1,300 feet west of the North
Triphammer Road corridor. The 18 inch pipe is installed within a 32-inch steel casing that was
originally bored between the north and south boundaries of NYS Route 13. This transmission
main connects the Oakcrest Road Pump Station to the East Hill Storage Tank on Hungerfod Hill
in the Town of Ithaca. At present, there is no redundant crossing of the NYS Route 13 corridor
for the Bolton Point transmission main.
To avoid the extreme excavation conditions involved with repairing the Village’s water main in
the vicinity of the North Triphammer Road interchange, a new extension of the Airport Tank
distribution system between the north and south boundaries of NYS Route 13 is proposed. The
Village crossing will be located in close proximity to and parallel with the Bolton Point
transmission main. The adjacency of the Village and Bolton Point mains will facilitate
interconnections between the two pressure zones that can provide, on a temporary emergency
basis, a redundant crossing for the Bolton Point transmission system. The following sections
describe the extents of the new crossing, the method of operation, estimated project cost and
method of financing.
Proposed Water System Improvements
The extents of the proposed crossing improvements are illustrated on sheet C102 and include
approximately 402 feet of 18-inch ductile iron pipe, 4 gate valves, 2 fire hydrant assemblies and
other necessary fittings. Roughly 196 feet of the 18 inch pipe will be installed in a steel casing to
be bored beneath NYS route 13 between the highway boundaries. There will be short
interruptions in the Bolton Point transmission system to complete the installation of in-line
valves at the two points of connection. A short disruption of service will occur for Village
customers downstream of the Highgate Circle pressure reducing station while the
interconnection between the new and existing 8 inch mains on the south side of NYS Route 13
is completed.
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Project Conditions
The water main route will cross an existing drainage channel that runs parallel to the south
highway boundary. The channel crossing will require stabilization of the slopes and invert to
minimize scour. In addition, several trees and brush will be cleared at both the north and south
ends of the pipe route.
Soil borings completed in 2014 for the proposed transmission main project indicate bedrock was
encountered at a depth of 6.5 feet below existing grade along the south side of NYS Route 13.
It is expected that boring for the installation of the pipe casing will not encounter bedrock
although rock excavation may be required for the drainage channel crossing.
Permanent easements and temporary construction easements must be obtained from Rehold
Lansing, LLC and Lansing West Apartments, and 3 Highgate North East to facilitate connecting
the new 8 and 18 inch pipes to the existing mains.
Water System Operation
On a regular basis, the improvements will be operated and maintained by the Village of Lansing
as part of the Airport Tank distribution system. The North Triphammer Road crossing will
continue to be used to support the looped system until such time as a pipe failure forces closure
of that portion of main buried beneath the interchange ramps. When necessary, the operation of
isolation valves between the Bolton Point transmission system and Airport Tank distribution
system will allow Bolton Point to use the new crossing to effect repairs or replacement of the
existing 18 inch transmission pipe. During such occurrences the Village can maintain service to
customers south of NYS Route 13 via the Warren Road crossing and/or the North Triphammer
Road crossing. Normal operating pressures within the Airport Tank grid at the crossing will be
approximately 100 psi. When utilized by Bolton Point the main pressure will temporary increase
to 135 psi, however the isolation valves will segregate the higher pressure from the Village’s
system.
Cost of Improvements
The total estimated cost for the proposed public works improvement project is approximately
$366,642 based on the following itemized scope of construction. Note, the final installed
quantities may vary from the estimated quantities.
Table 1 - NYS Route 13 Crossing Estimated Project Cost
ITEM SCHEDULED ITEM UNIT OF
MEASURE
ESTIMATED
QUANTITY
UNIT
PRICE
TOTAL
PRICE
1. Mobilization LS 1 $20,000.00 $20,000.00
2. Tree Removal EA 45 $900.00 $40,500.00
3. Tree Planting
a. Red Oak 2.5-inch caliper EA 2 $925.00 $1,850.00
b. Red Pine 2.5-inch caliper EA 1 $600.00 $600.00
6. Ductile Iron Pipe and Fittings
c. 18-inch CL 52 (dedicated T-main) LF 128 $148.00 $18,944.00
c. 18-inch CL 52 (jointly used) LF 78 $148.00 $11,544.00
7. Resilient Seated Gate Valves 18-inch EA 4 $12,300.00 $49,200.00
8. Hydrant Assembly 18"x18"x6" tee EA 2 $4,620.00 $9,240.00
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9. Highway Crossing LF 196 $412.00 $80,752.00
10. Trench and Pit Rock Excavation CY 100 $150.00 $15,000.00
11. Connection to Existing Water Main
c. Connection to 18" T-main EA 2 $2,500.00 $5,000.00
12. Water Line Marker Sign EA 2 $6.00 $12.00
13. Stone Fill Bank Stabilization TON 100 $60.00 $6,000.00
14. Temporary Silt Fence* LF 750 $1.00 $750.00
15. Temporary Sediment Control Log LF 40 $15.00 $600.00
16. Surface Restoration LS 1 $34,000.00 $34,000.00
17. Asphalt Pavement Restoration SY 300 $72.00 $21,600.00
SUBTOTAL $315,592.00
Survey, Engineering and Construction Administration $36,050.00
Legal, Administrative and Permitting $15,000.00
TOTAL ESTIMATED PROJECT COST $366,642.00
Method of Financing Project Cost
The Village of Lansing will initially assume all costs associated with the project utilizing water
system capital reserve funds. A proportional share of the project cost will be reimbursed to the
Village by Bolton Point per a formal use agreement executed by the two parties. For the
purpose of developing the use agreement, the project cost for those items of work associated
with the crossing improvements are proposed to be shared per the following percentages. Sheet
C102 attached identifies the work items itemized in Table 2.
Table 2 - Proposed Project Cost Sharing
VILLAGE SCLIWC
ITEM SCHEDULED ITEM
TOTAL
PRICE %
TOTAL
PRICE %
TOTAL
PRICE
1. Mobilization $20,000 50.0% $10,000.00 50.0% $10,000.00
2. Tree Removal $40,500 40 $36,000.00 5 $4,500.00
3. Tree Planting
a. Red Oak 2.5-inch caliper $1,850 1 $925.00 1 $925.00
b. Red Pine 2.5-inch caliper $600 0 $0.00 1 $600.00
6. Ductile Iron Pipe and Fittings
c. 18-inch CL 52 (dedicated T-main) $18,944 0.0% $0.00 100.0% $18,944.00
c. 18-inch CL 52 (jointly used) $11,544 45.0% $5,194.80 55.0% $6,349.20
7. Resilient Seated Gate Valves 18" $49,200 0.0% $0.00 100.0% $49,200.00
8. Hydrant Assembly 18"x18"x6" tee $9,240 66.7% $6,160.00 33.3% $3,080.00
9. Highway Crossing $80,752 45.0% $36,338.40 55.0% $44,413.60
10. Trench and Pit Rock Excavation $15,000 41.5% $6,225.00 58.5% $8,775.00
11. Connection to Existing Water Main
c. Connection to 18" T-main $5,000 0.0% $0.00 100.0% $5,000.00
12. Water Line Marker Sign $12 41.5% $4.98 58.5% $7.02
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13. Stone Fill Bank Stabilization $6,000 50.0% $3,000.00 50.0% $3,000.00
14. Temporary Silt Fence $750 41.5% $311.25 58.5% $438.75
15. Temporary Sediment Control Log $600 41.5% $249.00 58.5% $351.00
16. Surface Restoration $34,000 50.0% $17,000.00 50.0% $17,000.00
17. Asphalt Pavement Restoration $21,600 50.0% $10,800.00 50.0% $10,800.00
SUBTOTAL $315,592 $132,208.43 $183,383.57
Survey, Engineering and Construction
Administration $36,050 $14,961.00 $21,089.00
Legal, Administrative and Permitting $15,000 $6,225.00 $8,775.00
PROJECT TOTAL $366,642 $153,394.43 $213,247.57
Method of Financing Future Maintenance Cost
The cost of any future repairs or replacement of the work items itemized in Table 2 incurred by
either the Village or Bolton Point will be shared per the percentages established for the initial
project construction.
T. G. Miller, P.C.
Engineers and Surveyors
203 North Aurora Street
Ithaca, New York 14850