CR 99-201 Approve Engineering Service Agreement- Sanitary Sewer Rehabillitation
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October 28, 1999
Council Report 99-201
Approve Engineering Services Agreement - Sanitary Sewer Rehabilitation
Proposed Action.
Staff recommends adoption of the following motion: Move that Council authorize the Mayor and City
Manaoer to enter into an aoreement with Howard R. Green Company (HRG Co.) for enoineerino
services for sanitary sewer rehabilitation - 3rd Street North.
Overview.
During the Phase I sump pump inspection program, it was determined that the 8" sanitary sewer pipe
running from 14h Avenue North to 11th Avenue North could become surcharged during wet weather
conditions based on the number of connections and MPCA guidelines. A year 2000 rehabilitation
project was included in the current CIP. This project will increase the pipe size from 8" to 12" by
utilizing a trenchless pipe replacement method called "pipe bursting". The existing clay pipe is
enlarged with a hydraulic tool that is pulled through the pipe and a new polyethylene pipe is pulled
behind the expansion (bursting) head. This process eliminates the need to excavate in the street
other than launch pits at the manholes. There are no service pipe connections along this 3rd Street
section of sanitary sewer pipe.
Primary Issues to Consider.
Project cost: The estimated project budget from the CIP is $70,000. The project will be funded
from the sanitary sewer fund. The current project estimate is $75,000. The engineering fees are
$9,100.
Project schedule: The project will be designed within the next 30 days, bid opening would be in
February, 2000 with construction in May - June, 2000.
Resident impact: The project should be transparent to residents as the contractor will be required
to maintain sewage flow with bypass pumping.
Supportino Information.
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Howard R. Green Company
CONSULTING ENGINEERS
February 25, 1999
File: 805840J
Mr. Steven Stadler
Public Works Director
City of ,Hopkins
1010 1 st Street
Hopkins, MN 55343-7573
RE: SANITARY SEWER STUDY
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Dear Mr. Stadler:
We have completed our work as it relates to review of alternative methods for rehabilitation of
sanitary sewer along 3rd Street North between 11th and 14th Avenues (3 blocks).
'Ne have reviewed the site and note that 3rd Street North appears to be in good condition. We
have also reviewed flow predictions that have been completed previously, records of
correspondence between the City and residents and television inspections of lines. The
proposed scope of work is to replace the existing 8" diameter VCP line with a 12" diameter
plastic pipe. Our review of records has lead us to believe that the existing 8" VCP line is
operating at or near capacity. Television inspection records indicate the pipe is in poor
condition and many joints are being penetrated by roots, thereby causing blockages and
providing a point source of infiltration and/or inflow. The periodic back-ups as reported indicate
that rainfall and/or groundwater is entering the system.
Replacing the existing line with a larger line (12" diameter) and seamless construction (butt-weld
fusion) will provide greater capacity and eliminate extraneous flows entering through
broken/cracked pipes and open joints. As such, we believe a technique known as Pipe Bursting
is well suited for your project site. Pipe Bursting provides for sewer replacement without all the
associated costs for surface restoration due to trench excavation. '
Sewer rehabilitation accomplished with the Pipe Bursting technique is completed in less time
than with conventional trench excavation methods and surface restoration. For your
information, we have included a copy of an article prepared by Howard R. Green Company that
'Nas published in a company newsletter.
'Ne have estimated construction costs for Pipe Bursting and conventional.:trench excavation
methods. The unit cost shown includes incidental costs for excavation and backfill of
extraction/insertion pits, removal and restoration of pavement surface, flow bypass pumping,
and television inspection of the completed installation: \ .
J:' PROJ\805840J\1604.feb
1326 Energy Park Drive. St. Paul, MN 55108 . 651/644-4389 'ax651/644-9446 toll free 888/368-4389
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Mr. Steven Stadler
February 25, 1999
Page Two
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Pipe Bursting, 8" to 12" diameter
12" HOPE
4' Diameter Manholes (0'-15' depth)
Traffic Control
PIPE BURSTING
Unit Quantity
LF 1,000
LF 1,000
EA 5
LS 1
Unit Cost
S26.00
S26.00
$2,000.00
$2,600.00
Total Cost
S26,000.00
$26,000.00
510,000.00
S2,600.00
$64,600.00
ESTIMATED TOTAL CONSTRUCTION COST
The estimated costs below include costs for incidental items such as dewatering (if required),
flow bypass, pavement removals, and television inspections of the completed installation:
CONVENTIONAL TRENCH EXCAVATION
I Unit Quantity Unit Cost Total Cost
12" PVC 0'-15' Depth LF 1,000 526.00 S26,000.00
Manhole
4' Diameter Manhole EA 5 $2,000.00 $10,000.00
wi Casting (0' - 15')
Street Restoration - Full
Width with Concrete
Curb & Gutter, 3" Depth LF 1,000 S47.55 $47,550.00
Bituminous Surface, 6"
Depth CL5
Traffic Control LS 1 $4,000.00 $4,000.00
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ESTIMATED TOTAL CONSTRUCTION COST $87,550.00
Either method will provide increased flow capacity as a result of increasing pipe size utilizing the
existing pipe gradients.
We have included costs for replacement manholes in both options. The City may choose not to
replace manholes if they are in reasonable condition, such that they can be disassembled and
reassembled to facilitate construction.
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O:\PROJ\805840J\1604.feb
Howard R, Green Company
CONSULTING ENGINEERS
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. Mr:Ste~en Stadler.<'
February 25, 1999
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Our estimated engineering costs for the project utilizing Pipe Bursting are as follows:
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Plans and Specifications
Construction Administration
Construction Staking
Construction Inspection
$5,200.00
$1,300.00
$.00*
$2,600.00
*Pipe Bursting utilizes existing alignment and grade. No staking is required.
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" These, cost;s . do not. Inciu<de -~costsJor pre Iim'i na I)' '~uryey. mcilterialsJ~stir1.g,s'~l:>s~rface s9i1s
,,' expioratiol1; a'nd permit and/or associated application fees. ";,,' ' ":'-- , ~. -~ ~-;. ,
We anticipate being able to start work on plans and specifications within ten days of notice to
proceed and complete the work. within four weeks' time.
Should you have any questions, please call us at 651/644/4389.
Sincerely,
Howard R. Green Company ~
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Ross D. Abel, P.E.
Project Manager
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Craig L. Ebeling, P.E., HRG
Kirk Roessler, HRG
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0:\PROJ\805840J\1604.feb
Howard R. Green Company
CONSULTING ENGINEERS
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Utilities
FUNDING
SOURCE
2000
PROJECT TITLE NUMBER
Sanitary Sewer Rehabilitation SA-3
SCHEDULED PROJECT ACTIVITY
2001 2002 2003 2004
CATEGORY
Sewer Fund
SF
70,000
LOCATION:
3rd Street North between 11 th-14th Avenues.
DESCRIPTION:
Replace existing 8" diameter clay pipe sanitary main with 12" diameter plas~ic pipe.
Pipe will be replaced by using "Pipe Bursting" technique. No street excavation
will be done;
JUSTIFICATION:
The current pipe is in poor condition with much root prenetration. The pipe is at or
near capacity in flow and may account for some sewage backups.
CURRENT STATUS/PROJECTED SCHEDULE:
Plans and specifications
Bid and construction
1999
2000
RELATIONSHIP TO EXISTING PLANS AND OTHER PROGRAMS:
Consistent with water and sewer master plan approved in 1990.
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