Cranford Phase 5 Stormwater Improvements - July 2023

BID #: 507351416-008

ISSUED: 7/31/2023

OPENED: 12/8/2025

DUE: TBD

VALUE: $4,813,750

100

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Green Risk

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Executive Summary

This document outlines a study performed by Mott MacDonald for the Township of Cranford regarding Phase 5 of the Northeast Quadrant Stormwater Management Project. The project focuses on addressing flooding issues in Areas #2 and #3 along the Rahway River, and involves preliminary design for storm drainage improvements. Key components include the construction of a permanent stormwater pump station, an express sewer system, and collector storm sewer systems. The study considers various alternative conceptual designs and layouts for these improvements, evaluating their effectiveness and cost implications.

Web Content

Mott MacDonald | Township of Cranford Phase 5 Stormwater Management Project
Park Avenue Stormwater Pumping Station, Penn Road Express Sewer and Local Collector System

Page v of v

Contents 1 Introduction 1 1.1 Location 1 1.2 Background 1 2 Project Description 5
2.1 General 5
2.2 Pump Station 5

2.2.1 3 MB

Document Text

--- Document: Cranford Phase 5 Stormwater Improvements - July 2023 Document ---
Township of Cranford
Phase 5 Stormwater
Management Project
Park Avenue Stormwater Pumping Station, Penn
Road
Express Sewer and Local Collector System
July 2023
Page i of v


Page iii of v
Mott MacDonald
412 Mount Kemble Avenue
Suite G22
Morristown
NJ 07960
United States of America
T +1 (908) 730 6000
mottmac.com
Township of Cranford
Phase 5 Stormwater
Management Project
Park Avenue Stormwater Pumping Station, Penn
Road
Express Sewer and Local Collector System
July 2023


Mott MacDonald | Township of Cranford Phase 5 Stormwater Management Project
Park Avenue Stormwater Pumping Station, Penn Road Express Sewer and Local Collector System
Page iv of v
Issue and revision record
Revision
Date
Originator
Checker
Approver
Description
1
7/31/23
KKN
JKR
KKN
Updated Report for 2023
Document reference: 507351416-008 |
Information class: Standard
This document is issued for the party which commissioned it and for specific purposes connected with the above-
captioned project only. It should not be relied upon by any other party or used for any other purpose.
We accept no responsibility for the consequences of this document being relied upon by any other party, or being
used for any other purpose, or containing any error or omission which is due to an error or omission in data supplied
to us by other parties.
This document contains confidential information and proprietary intellectual property. It should not be shown to other
parties without consent from us and from the party which commissioned it.


Mott MacDonald | Township of Cranford Phase 5 Stormwater Management Project
Park Avenue Stormwater Pumping Station, Penn Road Express Sewer and Local Collector System
Page v of v
Contents
1
Introduction
1
1.1
Location
1
1.2
Background
1
2
Project Description
5
2.1
General
5
2.2
Pump Station
5
2.2.1
Alternative A
6
2.2.2
Alternative B
6
2.2.3
Alternative C
7
2.2.4
Alternative D
7
2.3
Express Sewer
9
2.4
Collector Storm Sewers
9
2.4.1
Alternative 1
10
2.4.2
Alternative 2
10
3
Preliminary Estimated Construction Costs
15
4
Summary
17
Appendix A - Cost Estimates
19


Mott MacDonald | Township of Cranford Phase 5 Stormwater Management Project
Park Avenue Stormwater Pumping Station, Penn Road Express Sewer and Local Collector System
507351416-008 | July 2023
Page 1 of 20
1 Introduction
The Township of Cranford authorized Mott MacDonald to perform a study of the Phase
5 component of the Northeast Quadrant Stormwater Management Project within the
Township of Cranford. Mott MacDonald conducted an investigation to determine the
limits of the Phase 5 project area and performed a hydrologic and hydraulic analysis to
determine the problem areas and to provide proposed stormwater management
improvements. The services under this study provide preliminary design of storm
drainage improvements, which include a new pumping station, an express sewer
system and collector storm sewer systems. Mott MacDonald has considered alternative
conceptual designs and layouts for the storm drainage improvements.
1.1 
Location
The Township of Cranford is located in Union County, in the Rahway River watershed.
The Rahway River winds through the Township over a length of approximately 4.75
miles between Kenilworth Boulevard in the north and the Garden State Parkway at
Sperry Dam in the south. Refer to Figure 1.
The Lenape Park detention basin is located on the main stem of the Rahway River in
the Borough of Kenilworth just north of Kenilworth Boulevard and has a tributary
drainage area of 30.8 square miles at its outlet. The detention effect of this facility
reduces the peak flows in the downstream reach of the River in Cranford, where
residents have experienced severe flooding over a number of years. Downstream of
Kenilworth Boulevard, the Rahway River meanders through Nomahegan Park,
extending from Kenilworth Boulevard to Springfield Avenue in Cranford (a length of
approximately one mile). Residential areas in the vicinity of the park and the Rahway
River continue to experience chronic flooding. Several years ago, Cranford embarked
on a comprehensive stormwater and flood management projects to alleviate the
flooding to these residential areas. The current project, as described below, is identified
as Phase 5 and is one component in this comprehensive program.
1.2 
Background
The residential area along the Rahway River in Cranford, between Kenilworth
Boulevard and Springfield Avenue, includes three major flood problem areas, identified
as follows:
Area #1
Riverside Drive, Brookdale Road, Edgewood Road, Venetia
Avenue, Kensington Avenue Area, comprising an internal
drainage area of approximately 367 acres on the east bank of
the river. Refer to Figure 2.
Area #2
Park Drive, Brookside Place, Beech Street, Willow Street Area,
comprising an interior drainage area of 94 acres on the west
bank of the river. Refer to Figure 2.


Mott MacDonald | Township of Cranford Phase 5 Stormwater Management Project
Park Avenue Stormwater Pumping Station, Penn Road Express Sewer and Local Collector System
507351416-008 | July 2023
Page 2 of 20
Area #3
Balmiere Parkway, Crescent Place, Hampton Road Area,
comprising an interior drainage area of approximately 38 acres
on the west bank of the river. Refer to Figure 2.
The flood prone portions of Areas #2 and #3 are served by different storm sewer
systems, separated by higher land, and are thus considered individually, although both
areas are on the west bank of the river.
The Township, County, State (NJDEP) and federal (Army Corps of Engineers)
agencies have undertaken numerous drainage and flood management studies. The
findings of these studies were considered in the development of a comprehensive plan
for improvements to reduce the frequency of flooding in Cranford. The overall plan
includes five (5) Phases as follows:
Phase 1 - Express storm sewer system and interior drainage facilities in Area
#1.
Phase 2 – Collector storm sewer along Riverside Drive and permanent
stormwater pump station in Area #1.
Phase 3 - Extension and modification of existing dikes on the east side of the
river. (serving Area #1)
Phase 4 – Extension and modification of dikes on the west side of the river
(serving Areas #2 and #3).
Phase 5 – Interior drainage improvements in Areas #2 and #3, including a
stormwater pump station, express sewer system and collector storm sewer
system.
These five phases are interrelated but yet independent. Each phase provides distinct
benefits, which are enhanced by the related phases. For example, Phase 1
improvements will reduce the frequency of flooding in the lower portions of Area #1 due
to storm sewer surcharging and excess overland flow from higher elevated areas.
However, portable pumps will still be needed to pump water from behind the existing
dikes during severe storms. Phase 2 will eliminate the need for portable pumps by
providing a permanent pumping facility. Phases 3 and 4 will reduce the frequency of
the Rahway River overflowing its banks and overtopping the existing dikes. Phase 5
will reduce the frequency of storm sewer flooding in Areas #2 and #3.
Phase 1 and Phase 2 have been designed and the Township has completed
construction to implement these improvements. Phase 5, as described further below,
will be the next Phase to be considered and further evaluated by the Township.


Mott MacDonald | Township of Cranford Phase 5 Stormwater Management Project
Park Avenue Stormwater Pumping Station, Penn Road Express Sewer and Local Collector System
507351416-008 | July 2023
Page 3 of 20


Mott MacDonald | Township of Cranford Phase 5 Stormwater Management Project
Park Avenue Stormwater Pumping Station, Penn Road Express Sewer and Local Collector System
507351416-008 | July 2023
Page 4 of 20


Mott MacDonald | Township of Cranford Phase 5 Stormwater Management Project
Park Avenue Stormwater Pumping Station, Penn Road Express Sewer and Local Collector System
507351416-008 | July 2023
Page 5 of 20
2 Project Description
2.1 
General
Phase 5 of the stormwater management and flood management program for the
Township of Cranford includes construction of a permanent stormwater pump station.
Four (4) alternative locations are discussed in this report. Refer to Figures 3A and 3B.
Phase 5 also considers an express sewer along Brookside Place and Penn Road
within flood problem Area #2. Refer to Figure 4. Planning also includes a collector
storm sewer system in the vicinity of Balmiere Parkway, Crescent Place and Park
Drive. Refer to Figure 5.
There is an existing dike on the west bank of the Rahway River along most of the
length of Park Drive, Balmiere Parkway and Crescent Place. Stormwater is discharged
from local systems at several locations along the length of the dike. However, when the
river level reaches the elevations of the low areas in the local streets, water is unable to
drain by gravity to the river and starts ponding in these residential areas adjacent to the
river. Also, these low-lying areas, unable to discharge to the river, continue to receive
significant volumes of stormwater runoff from the higher portions of Areas #2 and #3.
Under existing conditions, the only storm sewer system to provide relief to the low-lying
areas is a detention pond (Fable’s Pond) and an express sewer in the vicinity of Union
County College campus. This system currently collects runoff from an area northwest
of Area #2 and discharges via a large express sewer directly to Nomahegan Park. After
a thorough analysis of this system, it was determined that the system has a maximum
capacity for the 50-year design storm and cannot be utilized for additional stormwater
relief without major reconstruction.
The Phase 5 project will connect the several independent storm sewers in Areas #2
and #3 that discharge to the river and will convey the flow to a proposed pump station.
Water will be discharged by gravity outlets until the river water level rises to an
elevation that inhibits gravity discharge. The permanent stormwater pumps will then
start at preset elevations, initially with one pump operating and then with additional
pumps coming on line as the water level continues to rise, depending on the river level
and interior drainage flow as the storm progresses. The proposed express sewer in
Phase 5 will reduce the quantity of water that must be pumped during a given storm (by
virtue of the express storm sewer serving the higher areas).
2.2 
Pump Station
The Phase 5 pump station will be located in the general vicinity of either Park Drive or
Balmiere Parkway. This analysis evaluates four alternative locations. The pump station
will have a maximum design capacity of approximately 120 cubic feet per second (cfs).
Approximately 70 cfs will be provided to serve Area #2, and an additional 50 cfs to
include Area #3, with one backup pump in case of failure of one of the other pumps.
However, during extreme events, all the pumps will be able to operate concurrently and
serve the combined needs of Areas #2 and #3. The pump station will also include
smaller pumps for dewatering the wet well and a trash rack at the inlet to the station.


Mott MacDonald | Township of Cranford Phase 5 Stormwater Management Project
Park Avenue Stormwater Pumping Station, Penn Road Express Sewer and Local Collector System
507351416-008 | July 2023
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The station will operate on commercial electrical power with backup power provided by
a standby generator. During final design, further consideration could be given to having
a portable generator.
Current planning is for the station to be located on one of four residential lots known as
Alternatives A, B, C and D. Refer to Figure 3A and 3B. For each alternative, discharge
lines from the pump station would cross Park Drive and/or the existing dike, and
discharge at a proposed headwall with a riprap splash pad adjacent to Nomahegan
Park or directly to the Rahway River. The inlets to the pump stations would be from the
existing brook between Springfield Avenue and Park Drive and the collector sewer
along Crescent Place and Balmiere Parkway for all four alternatives.
2.2.1 
Alternative A
Under this Alternative, the pump station would reside on Block 197 Lot 9 adjacent to
the existing College Brook tributary to the pond in Nomahegan Park. The discharge
force mains would run parallel to College Brook, cross Park Drive and ultimately
discharge into Nomahegan Park through a proposed headwall that would replace an
existing culvert under Park Drive. The advantage of this location is that it is adjacent to
the brook that would serve as the inlet to the pump station and it would reside within
200 feet from the proposed outlet structure. This will keep construction costs down due
to the reduced length of force mains required for the pump station.
The downside of this location is it will be difficult and costly to connect the collector
storm sewers from Balmiere Parkway into the pump station. Also, this location appears
to be located within the floodway and flood hazard area of the College Brook and the
Rahway River. The floodway will need to be delineated based on an appropriate
hydrologic and hydraulic study. The approximate limits of the 100-year flood plain are
shown on the NJDEP delineated Flood Hazard Area map for the Rahway River.
Accordingly, it appears that the proposed location more likely will be within the
floodway. If this is the case, the effort to obtain a Flood Hazard Area Permit will be
extensive as any construction within the floodway is a prohibitive use. A waiver of this
rule may not be granted in the presence of other alternatives. This will also increase
the costs of the permitting process and impose restrictions in construction. Also, at this
location, it will be difficult and costly to connect the collector storm sewers from
Balmiere Parkway into the pump station.
2.2.2 
Alternative B
This location, Block 151 Lot 14, is situated on an existing farm adjacent to Springfield
Avenue and College Brook. The discharge force mains would cross Springfield
Avenue, continue parallel to College Brook, cross Park Drive and ultimately discharge
into Nomahegan Park similar to Alternative A above. Although there is sufficient area
with immediate access to construct the pump station, the site would be located
approximately 500 feet upstream from the proposed outlet structure. This would
increase the costs for the pump station due to the increased length of pipe and
easements that would be required to construct the force mains. This alternative may
require additional measures, such as lowering the bottom elevation of College Brook
near Springfield Avenue, to assure that the low areas of Area #2 drain to the inlet of the
pump station. Also, at this location, it may be difficult or impossible to connect the


Mott MacDonald | Township of Cranford Phase 5 Stormwater Management Project
Park Avenue Stormwater Pumping Station, Penn Road Express Sewer and Local Collector System
507351416-008 | July 2023
Page 7 of 20
collector storm sewers under Alternative 2 from Balmiere Parkway into the pump
station.
Similar to Alternative A above, it appears that the pump station may reside in the
floodway of College Brook. According to the NJDEP delineated Flood Hazard Area
map for the Rahway River, the limit of the study ends just downstream of Springfield
Avenue where the pump station would reside. Although there is sufficient area to
relocate the pump station outside the floodway, the floodway would still need to be
delineated based on an appropriate hydrologic and hydraulic study. This would
increase the costs and the amount of work required for the permitting process.
2.2.3 
Alternative C
Under this Alternative, the pump station would reside on Block 198 Lot 7 adjacent to
Romore Place. The pump station would be approximately 250 feet east of College
Brook and would require an inlet structure and piping to convey water from the brook to
the pump station. The inlet pipes would travel along Park Drive, Romore Place and
ultimately to the pump station. The outlet force mains would parallel back to the brook
and discharging to the proposed outlet structure at Nomahegan Park. This alternative
is similar to Alternative A except that it is situated outside the floodway and would
require more linear footage of piping to the inlet and outlet structures. Also, like
Alternative A, it will be difficult and costly to connect the collector storm sewers from
Balmiere Parkway into the pump station. Since the pump station only resides in the
100-flood plain and not the floodway, the work involved in obtaining the permits would
be less than Alternatives A and B.
2.2.4 
Alternative D
This location, Block 199 Lot 54, is situated on residential property adjacent to Balmiere
Parkway and near the Rahway River. Refer to Figure 3B. This alternative would not
use the proposed outfall under Alternative A, B and C. Instead, it would have a
proposed outfall directly into the Rahway River just upstream of the Balmeire Parkway
footbridge and in the general vicinity of the proposed pump station. With this
alternative, the inlet piping would be approximately 1500 feet in length from College
Brook and Park Drive area and 900 feet in length from Crescent Place and Balmeire
Parkway area. The inlet pipe from the College Brook area would begin at College
Brook, continue along Park Drive and ultimately to the proposed pump station. The
inlet pipe from the Crescent Place area would begin at Crescent Place and continue
towards Balmeire Parkway and ultimately to the proposed pump station.
What is unique with this alternative is its close proximity to the proposed collector
system on Balmiere Parkway. However, the downside of this location is it may be
difficult and costly to connect the collector storm sewers from Park Dirve into the pump
station. Obtaining NJDEP permits would be similar to Alternative C as the proposed
pump station only resides in the 100-flood plain and not the floodway.


Mott MacDonald | Township of Cranford Phase 5 Stormwater Management Project
Park Avenue Stormwater Pumping Station, Penn Road Express Sewer and Local Collector System
507351416-008 | July 2023
Page 8 of 20


Mott MacDonald | Township of Cranford Phase 5 Stormwater Management Project
Park Avenue Stormwater Pumping Station, Penn Road Express Sewer and Local Collector System
507351416-008 | July 2023
Page 9 of 20
2.3 
Express Sewer
The Phase 5 express sewer system would begin at the intersection of Beech Street
and Brookside Place as a 48-inch diameter reinforced concrete pipe. The express
sewer system would continue northeast along Brookside Place for approximately 500
feet before turning northwest onto Harvard Road. The system would continue along
Harvard Road for an additional 500 feet before turning northeast onto Penn Road. The
system would continue along Penn Road for approximately 950 feet to the intersection
of Penn Road and Springfield Avenue. At this point, the express system would change
to a 54-inch diameter reinforced concrete pipe and continue along Springfield Avenue
for approximately 330 feet before connecting into an existing 66-inch diameter express
sewer and ultimately discharging to an existing outfall in Nomahegan Park. Refer to
Figure 4. The proposed express sewer system would be capable of conveying a 50-
year storm flow of approximately 60 cubic feet per second from the higher elevated
region of Area #2 directly to the Rahway River in Nomahegan Park. This will prevent
significant volumes of stormwater runoff from flooding the low-lying portions of Areas
#2 and #3 and considerably reduce the required capacity of the pump station for the
lower regions of these areas.
Construction of the express sewer would not require any easements from Green Acres
or local residents. Only a Flood Hazard Area Individual Permit and Fresh Water
Wetlands General Permit would be required for tying into the existing outfall at
Nomahegan Park. Since a portion of the express sewer alignment will be on Springfield
Avenue, a major thoroughfare, any major utilities and traffic control measures would be
evaluated during the final design phase.
2.4 
Collector Storm Sewers
Under existing conditions, local storm sewers discharge to the Rahway River at several
locations along Park Drive, Balmiere Parkway, Crescent Place and general vicinity.
Local discharge sewers along Balmiere Parkway, Crescent Place, Park Drive and
vicinity will be connected to a proposed collector sewer that will run adjacent along the
existing dike alignment from the south and along Park Drive from the north. Refer to
Figure 5. The collector sewers will connect to the proposed Phase 5 pump station at
one of the four alternative pump station locations. The local discharges will continue to
discharge to the river by gravity when river levels permit. When the river levels are
high, water will be conveyed to the pump station when gravity discharge is inhibited.
Each of the gravity outlets have or will be fitted with back flow prevention devices to
keep the river water out of the storm sewer system. As indicated above, when the
water level in the storm sewer system reaches predetermined levels, the pumps in the
proposed Phase 5 pump station will be activated.
Currently there are sections along the west bank of the Rahway River within Area #3
that do not have any dikes. Without dikes, the level of protection provided by the
proposed collector sewers would be reduced. Therefore, construction of the collector
sewers without modifications to portions of the dike may not be practical.
There are two alternatives for the proposed collector sewer systems depending on the
proposed location of the Phase 5 pump station. The alternatives are as follows:


Mott MacDonald | Township of Cranford Phase 5 Stormwater Management Project
Park Avenue Stormwater Pumping Station, Penn Road Express Sewer and Local Collector System
507351416-008 | July 2023
Page 10 of 20
2.4.1 
Alternative 1
The collector sewer system for this alternative will serve pump station locations A, B
and C. The collector sewer will follow the alignment of the existing dike. Pipe sizes of
the collector system will range from 36-inch diameter to 54-inch diameter and will start
from Crescent Place and extend to the vicinity of Remore Place and Park Drive where
it would tie into one of the three pump station locations. Refer to Figure 5.
2.4.2 
Alternative 2
The collector sewer system for this alternative will be similar in alignment to Alternative
1 above except that it will connect to the proposed pump station on Block 199, Lot 54
as described under Alternative D above. The collector system will extend
approximately 800 feet south along Crescent Place and Balmiere Parkway and
approximately 1,500 feet north along the existing dike and Park Drive. Pipe sizes of the
collector system will range from 36-inch diameter to 48-inch diameter. This Alternative
2 is specific with pump station Alternative D. Refer to Figure 5.


Mott MacDonald | Township of Cranford Phase 5 Stormwater Management Project
Park Avenue Stormwater Pumping Station, Penn Road Express Sewer and Local Collector System
507351416-008 | July 2023
Page 11 of 20


Mott MacDonald | Township of Cranford Phase 5 Stormwater Management Project
Park Avenue Stormwater Pumping Station, Penn Road Express Sewer and Local Collector System
507351416-008 | July 2023
Page 12 of 20


Mott MacDonald | Township of Cranford Phase 5 Stormwater Management Project
Park Avenue Stormwater Pumping Station, Penn Road Express Sewer and Local Collector System
507351416-008 | July 2023
Page 13 of 20


Mott MacDonald | Township of Cranford Phase 5 Stormwater Management Project
Park Avenue Stormwater Pumping Station, Penn Road Express Sewer and Local Collector System
507351416-008 | July 2023
Page 14 of 20


Mott MacDonald | Township of Cranford Phase 5 Stormwater Management Project
Park Avenue Stormwater Pumping Station, Penn Road Express Sewer and Local Collector System
507351416-008 | July 2023
Page 15 of 20
3 Preliminary Estimated Construction
Costs
The preliminary estimated construction costs for the various alternatives presented
above are listed in Table 2 on the following page. Note that the costs are preliminary
estimates and serve to provide a basis for the relative evaluation of the alternative for
project selection only. The actual capital improvement costs will be dependent on other
factors such as additional engineering and administrative costs, land easement costs
and major utility conflicts which are beyond the scope of this investigation and would be
determined at the time of final design.


Mott MacDonald | Township of Cranford Phase 5 Stormwater Management Project
Park Avenue Stormwater Pumping Station, Penn Road Express Sewer and Local Collector System
507351416-008 | July 2023
Page 16 of 20


Mott MacDonald | Township of Cranford Phase 5 Stormwater Management Project
Park Avenue Stormwater Pumping Station, Penn Road Express Sewer and Local Collector System
507351416-008 | July 2023
Page 17 of 20
4 Summary
Mott MacDonald has completed an investigation of storm drainage problems in flood
problem Areas #2 and #3 described above. These investigations have included site
visits, review of topographic maps, aerial photographs and readily available utility
plans, development of estimated flows for the various drainage areas, evaluation of the
capacity of the existing storm sewer systems and development of Alternatives for storm
drainage improvements.
The investigation indicated that flooding at the low areas of Balmiere Parkway, Park
Drive and general vicinity is affected by overflow from upstream areas and a high water
surface elevation at the river. Thus, implementation of all the recommended
improvements above will ultimately benefit the low-lying areas west of the Rahway
River.
Suggested improvements have been described for each of the identified problem
areas, as summarized below:
Park Drive area pump station – Consideration of three (3) alternatives. Alternatives A,
B and C provide flood relief for the low-lying areas of flood problem Area #2 and Area
#3 with the inclusion of a collector sewer system extending to Balmiere Parkway and
vicinity. The pump station will have a capacity of approximately 120 cubic feet per
second which will provide a level of protection for approximately the 50-year storm
event.
The Balmeire Parkway pump station – Consideration of one pump station (1)
alternative. Alternatives D will provide flood relief for the low-lying areas of flood
problem Area #3 and Area #2 with the inclusion of a collector sewer system extending
to Park Drive and vicinity. The pump station will have a capacity of approximately 120
cubic feet per second which will provide a level of protection for approximately the 50-
year storm event.
Penn Road express sewer – Construction of the express sewer will convey a 50-year
storm flow of approximately 60 cubic feet per second from the higher elevated region of
Area #2 directly to the Rahway River in Nomahegan Park. This will significantly reduce
stormwater runoff from the upper portions of drainage Area #2 from flooding the low-
lying portions of Areas #2 and #3. Also construction of the express sewer will
considerably reduce the required capacity of the pump station for the lower regions of
these areas.
Balmiere Parkway and Parkway Drive collector storm sewers – Consideration of two
(2) alternatives. Alternative 1 is a collector system that will serve pump station
alternatives A, B, and C and provides relief for the low-lying areas of Areas #2 and
Area #3. This collector system will start from Crescent Place and extend to the vicinity
of Remore Place and Park Drive where it would tie into the selected pump station.
Alternative 2 is a collector system that will serve pump station alternatives D and
provides relief for the low-lying areas of Areas #2 and Area #3. This collector system
will extend approximately 800 feet south from the Alternative D pump station along


Mott MacDonald | Township of Cranford Phase 5 Stormwater Management Project
Park Avenue Stormwater Pumping Station, Penn Road Express Sewer and Local Collector System
507351416-008 | July 2023
Page 18 of 20
Balmiere Parkway and Crescent Place and extend approximately 1500 feet north from
the Alternative D pump station along the existing dikes and Park Drives. In order for the
proposed collector systems, Alternative 1 or 2, to provide a significant level of flood
protection, modifications may need to be made to the inadequate dikes along the west
bank of the Rahway River in the vicinity of Area #3. The estimated costs for the
collector systems proposed in this report do not reflect any costs associated with any
modifications to the existing dikes.
Preliminary estimated construction costs, as presented in Table 2 above, indicate that
the total for each of the alternatives presented are within 5 percent or less of each
other. This is exclusive of costs associated with legal and engineering as well as costs
associated with the acquisition of easements. Also, these total estimates are based
upon all the work being undertaken as one project. The proposed individual
components of the Phase 5 project can be constructed in separate projects. The
estimated construction costs for each individual component is also presented in Table
2 above. Whether constructed as one project or independently, each component will
provide numerous benefits to the overall Northeast Quadrant Stormwater Management
Project within the Township of Cranford.


Mott MacDonald | Township of Cranford Phase 5 Stormwater Management Project
Park Avenue Stormwater Pumping Station, Penn Road Express Sewer and Local Collector System
507351416-008 | July 2023
Page 19 of 20
Appendix A - Cost Estimates


PRELIMINARY ENGINEERS CONSTRUCTION COST ESTIMATE
for the
TOWNSHIP OF CRANFORD
UNION COUNTY, NEW JERSEY
NORTHEAST QUADRANT STORMWATER MANAGEMENT PROJECT
STORMWATER PUMPING STATION AND EXPRESS SEWER
IN THE VICINITY OF PARK DRIVE AND SPRINGFIELD AVENUE
PHASE 5 - ALTERNATIVE A - PUMP STATION
UNIT
ITEM #
DESCRIPTION
UNIT
QUANTITY
PRICE
COST
ITEM 1
FOR MOBILIZATION
Lump Sum
1
$150,000
$150,000
ITEM 2
FOR SOIL EROSION AND SEDIMENT CONTROL MEASURES Lump Sum
1
$15,000
$15,000
ITEM 3
FOR CLEARING SITE AND COORDINATION WITH
Lump Sum
1
$50,000
$50,000
UTILITY COMPANIES
ITEM 4
FOR CONTROL OF WORK/CONSTRUCTION
Lump Sum
1
$45,000
$45,000
LAYOUT
ITEM 5
FOR TEST PITS
CY
75
$150
$11,250
ITEM 6
FOR CONSTRUCTION OF REINFORCED
CONCRETE STRUCTURES, COMPLETE
Item 6a
For pump station chamber
EACH
1
$2,450,000
$2,450,000
Item 6b
For pump station outlet headwall
EACH
1
$200,000
$200,000
ITEM 7
FOR FURNISHING AND INSTALLING REINFORCED
CONCRETE PIPE, COMPLETE
Item 7a
For 36" Diameter RCP intake pipe
LF
100
$425
$42,500
ITEM 8
FOR PUMPING EQUIPMENT, COMPLETE
Lump Sum
1
$1,850,000
$1,850,000
TOTAL ESTIMATED CONSTRUCTION COST
$4,813,750
P:\283101\Contract-1\Cost Estimates\Preliminary Engineers CONSTRUCTION COST ESTIMATE-Pump Station Updated 2023
Page 1 of 2


PRELIMINARY ENGINEERS CONSTRUCTION COST ESTIMATE
for the
TOWNSHIP OF CRANFORD
UNION COUNTY, NEW JERSEY
NORTHEAST QUADRANT STORMWATER MANAGEMENT PROJECT
STORMWATER PUMPING STATION AND EXPRESS SEWER
IN THE VICINITY OF PARK DRIVE AND SPRINGFIELD AVENUE
PHASE 5 - ALTERNATIVE B - PUMP STATION
UNIT
ITEM #
DESCRIPTION
UNIT
QUANTITY
PRICE
COST
ITEM 1
FOR MOBILIZATION
Lump Sum
1
$150,000
$150,000
ITEM 2
FOR SOIL EROSION AND SEDIMENT CONTROL MEASURES Lump Sum
1
$15,000
$15,000
ITEM 3
FOR CLEARING SITE AND COORDINATION WITH
Lump Sum
1
$50,000
$50,000
UTILITY COMPANIES
ITEM 4
FOR CONTROL OF WORK/CONSTRUCTION
Lump Sum
1
$45,000
$45,000
LAYOUT
ITEM 5
FOR TEST PITS
CY
75
$150
$11,250
ITEM 6
FOR CONSTRUCTION OF REINFORCED
CONCRETE STRUCTURES, COMPLETE
Item 6a
For pump station chamber
EACH
1
$2,450,000
$2,450,000
Item 6b
For pump station outlet headwall
EACH
1
$200,000
$200,000
ITEM 7
FOR FURNISHING AND INSTALLING REINFORCED
CONCRETE PIPE, COMPLETE
Item 7a
For 36" Diameter RCP intake pipe
LF
300
$425
$127,500
ITEM 8
FOR PUMPING EQUIPMENT, COMPLETE
Lump Sum
1
$1,850,000
$1,850,000
TOTAL ESTIMATED CONSTRUCTION COST
$4,898,750
P:\283101\Contract-1\Cost Estimates\Preliminary Engineers CONSTRUCTION COST ESTIMATE-Pump Station Updated 2023
Page 1 of 1


PRELIMINARY ENGINEERS CONSTRUCTION COST ESTIMATE
for the
TOWNSHIP OF CRANFORD
UNION COUNTY, NEW JERSEY
NORTHEAST QUADRANT STORMWATER MANAGEMENT PROJECT
STORMWATER PUMPING STATION AND EXPRESS SEWER
IN THE VICINITY OF PARK DRIVE AND SPRINGFIELD AVENUE
PHASE 5 - ALTERNATIVE C - PUMP STATION
UNIT
ITEM #
DESCRIPTION
UNIT
QUANTITY
PRICE
COST
ITEM 1
FOR MOBILIZATION
Lump Sum
1
$150,000
$150,000
ITEM 2
FOR SOIL EROSION AND SEDIMENT CONTROL MEASURES Lump Sum
1
$15,000
$15,000
ITEM 3
FOR CLEARING SITE AND COORDINATION WITH
Lump Sum
1
$50,000
$50,000
UTILITY COMPANIES
ITEM 4
FOR CONTROL OF WORK/CONSTRUCTION
Lump Sum
1
$45,000
$45,000
LAYOUT
ITEM 5
FOR TEST PITS
CY
75
$150
$11,250
ITEM 6
FOR CONSTRUCTION OF REINFORCED
CONCRETE STRUCTURES, COMPLETE
Item 6a
For pump station chamber
EACH
1
$2,450,000
$2,450,000
Item 6b
For pump station outlet headwall
EACH
1
$200,000
$200,000
ITEM 7
FOR FURNISHING AND INSTALLING REINFORCED
CONCRETE PIPE, COMPLETE
Item 7a
For 36" Diameter RCP intake pipe
LF
300
$425
$127,500
ITEM 8
FOR PUMPING EQUIPMENT, COMPLETE
Lump Sum
1
$1,850,000
$1,850,000
TOTAL ESTIMATED CONSTRUCTION COST
$4,898,750
P:\283101\Contract-1\Cost Estimates\Preliminary Engineers CONSTRUCTION COST ESTIMATE-Pump Station Updated 2023
Page 1 of 1


PRELIMINARY ENGINEERS CONSTRUCTION COST ESTIMATE
for the
TOWNSHIP OF CRANFORD
UNION COUNTY, NEW JERSEY
NORTHEAST QUADRANT STORMWATER MANAGEMENT PROJECT
STORMWATER PUMPING STATION AND EXPRESS SEWER
IN THE VICINITY OF PARK DRIVE AND SPRINGFIELD AVENUE
PHASE 5 - ALTERNATIVE D - PUMP STATION
UNIT
ITEM #
DESCRIPTION
UNIT
QUANTITY
PRICE
COST
ITEM 1
FOR MOBILIZATION
Lump Sum
1
$150,000
$150,000
ITEM 2
FOR SOIL EROSION AND SEDIMENT CONTROL MEASURES Lump Sum
1
$15,000
$15,000
ITEM 3
FOR CLEARING SITE AND COORDINATION WITH
Lump Sum
1
$50,000
$50,000
UTILITY COMPANIES
ITEM 4
FOR CONTROL OF WORK/CONSTRUCTION
Lump Sum
1
$45,000
$45,000
LAYOUT
ITEM 5
FOR TEST PITS
CY
75
$150
$11,250
ITEM 6
FOR CONSTRUCTION OF REINFORCED
CONCRETE STRUCTURES, COMPLETE
Item 6a
For pump station chamber
EACH
1
$2,450,000
$2,450,000
Item 6b
For pump station outlet headwall
EACH
1
$200,000
$200,000
ITEM 7
FOR FURNISHING AND INSTALLING REINFORCED
CONCRETE PIPE, COMPLETE
Item 7a
For 36" Diameter RCP intake pipe
LF
0
$425
$0
ITEM 8
FOR PUMPING EQUIPMENT, COMPLETE
Lump Sum
1
$1,850,000
$1,850,000
TOTAL ESTIMATED CONSTRUCTION COST
$4,771,250
P:\283101\Contract-1\Cost Estimates\Preliminary Engineers CONSTRUCTION COST ESTIMATE-Pump Station Updated 2023
Page 1 of 1


PRELIMINARY ENGINEERS CONSTRUCTION COST ESTIMATE
for the
TOWNSHIP OF CRANFORD
UNION COUNTY, NEW JERSEY
NORTHEAST QUADRANT STORMWATER MANAGEMENT PROJECT
STORMWATER PUMPING STATION AND EXPRESS SEWER
IN THE VICINITY OF PARK DRIVE AND SPRINGFIELD AVENUE
PHASE 5 - EXPRESS SEWER
UNIT
ITEM #
DESCRIPTION
UNIT
QUANTITY
PRICE
COST
ITEM 1
FOR MOBILIZATION
Lump Sum
1
$90,000
$90,000
ITEM 2
FOR SOIL EROSION AND SEDIMENT CONTROL MEASURES Lump Sum
1
$15,000
$15,000
ITEM 3
FOR CONTROL OF WORK/CONSTRUCTION
Lump Sum
1
$75,000
$75,000
LAYOUT
ITEM 4
FOR TEST PITS
CY
200
$150
$30,000
ITEM 5
FOR FURNISHING AND INSTALLING REINFORCED
CONCRETE PIPE, COMPLETE
Item 5a
For 15" Diameter RCP
LF
225
$200
$45,000
Item 5b
For 24" Diameter RCP
LF
285
$275
$78,375
Item 5c
For 48" Diameter RCP
LF
1930
$450
$868,500
Item 5d
For 54" Diameter RCP
LF
320
$500
$160,000
ITEM 6
FOR CONSTRUCTION OF STORM SEWER
MANHOLES, COMPLETE
Item 6a
For 6 foot diameter manholes
EACH
7
$9,500
$66,500
Item 6b
For 8 foot diameter manholes
EACH
4
$15,000
$60,000
ITEM 7
FOR CONSTRUCTION OF DRAIN INLETS, COMPLETE
Item 7a
For Type B Drain Inlet
EACH
10
$6,500
$65,000
TOTAL ESTIMATED CONSTRUCTION COST
$1,553,375
P:\283101\Contract-1\Cost Estimates\Preliminary Engineers CONSTRUCTION COST ESTIMATE-Express sewer Updated 2023
Page 1 of 2


PRELIMINARY ENGINEERS CONSTRUCTION COST ESTIMATE
for the
TOWNSHIP OF CRANFORD
UNION COUNTY, NEW JERSEY
NORTHEAST QUADRANT STORMWATER MANAGEMENT PROJECT
STORMWATER PUMPING STATION AND EXPRESS SEWER
IN THE VICINITY OF PARK DRIVE AND SPRINGFIELD AVENUE
PHASE 5 - ALTERNATIVE 1 - COLLECTOR SEWER
UNIT
ITEM #
DESCRIPTION
UNIT
QUANTITY
PRICE
COST
ITEM 1
FOR MOBILIZATION
Lump Sum
1
$90,000
$90,000
ITEM 2
FOR SOIL EROSION AND SEDIMENT CONTROL MEASURES Lump Sum
1
$20,000
$20,000
ITEM 3
FOR CONTROL OF WORK/CONSTRUCTION
Lump Sum
1
$50,000
$50,000
LAYOUT
ITEM 4
FOR FURNISHING AND INSTALLING REINFORCED
CONCRETE PIPE, COMPLETE
Item 4a
For 15" Diameter RCP
LF
200
$200
$40,000
Item 4b
For 36" Diameter RCP
LF
310
$300
$93,000
Item 4c
For 42" Diameter RCP
LF
210
$400
$84,000
Item 4d
For 48" Diameter RCP
LF
1650
$450
$742,500
Item 4e
For 54" Diameter RCP
LF
260
$500
$130,000
ITEM 5
FOR CONSTRUCTION OF STORM SEWER
MANHOLES, COMPLETE
Item 5a
For 5 foot diameter manhole
EACH
11
$7,500
$82,500
Item 5b
For 6 foot diameter manholes
EACH
13
$9,500
$123,500
ITEM 6
FOR CONSTRUCTION OF DRAIN INLETS, COMPLETE
Item 6a
For Type B Drain Inlet
EACH
15
$6,500
$97,500
Item 6b
For Type E Drain Inlet
EACH
2
$6,500
$13,000
TOTAL ESTIMATED CONSTRUCTION COST
$1,566,000
P:\283101\Contract-1\Cost Estimates\Preliminary Engineers CONSTRUCTION COST ESTIMATE-Collector sewers updated 2023
Page 1 of 1


PRELIMINARY ENGINEERS CONSTRUCTION COST ESTIMATE
for the
TOWNSHIP OF CRANFORD
UNION COUNTY, NEW JERSEY
NORTHEAST QUADRANT STORMWATER MANAGEMENT PROJECT
STORMWATER PUMPING STATION AND EXPRESS SEWER
IN THE VICINITY OF PARK DRIVE AND SPRINGFIELD AVENUE
PHASE 5 - ALTERNATIVE 2 - COLLECTOR SEWER
UNIT
ITEM #
DESCRIPTION
UNIT
QUANTITY
PRICE
COST
ITEM 1
FOR MOBILIZATION
Lump Sum
1
$90,000
$90,000
ITEM 2
FOR SOIL EROSION AND SEDIMENT CONTROL MEASURES Lump Sum
1
$20,000
$20,000
ITEM 3
FOR CONTROL OF WORK/CONSTRUCTION
Lump Sum
1
$50,000
$50,000
LAYOUT
ITEM 4
FOR FURNISHING AND INSTALLING REINFORCED
CONCRETE PIPE, COMPLETE
Item 4a
For 15" Diameter RCP
LF
200
$200
$40,000
Item 4b
For 36" Diameter RCP
LF
600
$300
$180,000
Item 4c
For 42" Diameter RCP
LF
210
$400
$84,000
Item 4d
For 48" Diameter RCP
LF
1510
$450
$679,500
ITEM 5
FOR CONSTRUCTION OF STORM SEWER
MANHOLES, COMPLETE
Item 5a
For 5 foot diameter manhole
EACH
11
$7,500
$82,500
Item 5b
For 6 foot diameter manholes
EACH
13
$9,500
$123,500
ITEM 6
FOR CONSTRUCTION OF DRAIN INLETS, COMPLETE
Item 6a
For Type B Drain Inlet
EACH
15
$6,500
$97,500
Item 6b
For Type E Drain Inlet
EACH
2
$6,500
$13,000
TOTAL ESTIMATED CONSTRUCTION COST
$1,460,000
P:\283101\Contract-1\Cost Estimates\Preliminary Engineers CONSTRUCTION COST ESTIMATE-Collector sewers updated 2023
Page 1 of 1