HomeMy WebLinkAbout13.D.1. Additional Sanitary Sewer and Storm Drainage Improvements for the CR 101 ProjectCITY OF SHAKOPEE
Memorandum
TO: Mayor & City Council
Mark McNeill, City Administrator
FROM: Bruce Loney, Public Works Director
SUBJECT: Consider Additional Sanitary Sewer and
Storm Drainage Improvements for the C.R. 101 Project
DATE: January 18, 2011
INTRODUCTION:
Staff would like Council to consider additional sanitary sewer and storm drainage
improvements associated with the C.R. 101 Project.
BACKGROUND:
The C.R. 101 Reconstruction Project is being designed and plans will be presented to
City Council for approval soon. During the review of 95% plans, staff did further
investigation on a sanitary sewer line on Prairie Street and the trunk storm sewer on
Market Street, from 1 Avenue to the Minnesota River. Staff would like Council to
consider improvements in these areas.
On Prairie Street, the sanitary sewer from 1 Avenue to the alley was not replaced in the
1991 street reconstruction. Public works staff has investigated the line and it is in bad
condition and should be replaced. The condition of the line is such that it cannot be
lined. Cost of replacing this line is estimated at $36,000.00 and will be paid out of the
Sanitary Sewer Fund. Sufficient funds exist to pay for this improvement.
With the C.R. 101 Reconstruction Project, a portion of the line is being replaced and staff
would like Council concurrence to replace the line to the alley. Attachment "A" is the
1991 as- builts drawings of Prairie Street which shows the sewer line depth.
On the Market Street trunk storm sewer, from 1 Avenue to the Minnesota River, staff
has the following observations from as- builts, televising the line and design calculations:
1. The pipe from 1 Avenue to Bluff Avenue is a 48 -inch reinforced concrete pipe
(RCP) installed in 1959 and in good condition. (See Attachment `B ")
/3.0./.
2. The pipe north of Bluff Avenue to the river is 144 -feet of RCP and 437 -feet of
corrugated metal pipe (CMP) and installed in 1959 and is showing signs of
deterioration.
3. The current pipe is underdesigned according to the latest hydraulic calculations.
4. The State Turnback account will pay 28% of a new pipe installation.
5. The design life for CMP is approximately 50 years.
In review of this trunk storm sewer, which extends to 10 Avenue to the Minnesota
River, staff believes that this system should be replaced as the current pipe is undersized.
Also, the pipe is 50 years old and the State will contribute up to 28% of a new storm
sewer.
Staff is currently reviewing the alternatives with the consultant on the project for the best
design. Another option is to leave the 48 -inch RCP on Market Street, from 1 Avenue to
Bluff Avenue, and to install an additional pipe on Minnesota Street, then Bluff Avenue to
Market Street and then along the Minnesota River. This option may receive more State
turnback funds as the flow contribution is higher from C.R. 101.
The options for the Market Street storm sewer system can be summarized as follows:
1. Do nothing
2. Replace the existing pipe with a 60 -inch RCP, from 1 Avenue to the Minnesota
River.
3. Install a 48 -inch RCP storm sewer on Minnesota Street, from 1 Avenue to Bluff
Avenue and then a 48 -inch RCP on Bluff Avenue, from Minnesota Street to
Market Street. From Bluff Avenue north, replace the existing pipe with a 60 -inch
RCP.
The current estimates have the local share (Shakopee's cost) to be about the same, as the
State turnback funds should pick up more of the cost in Option No. 3. The
recommendation from the consultant team of Bolton & Menk and WSB & Associates are
recommending Option No. 3, however, this would depend on State turnback funding
levels. (See attached e -mail from Chris Chromy) An additional improvement with
Option No. 3 is that Minnesota Street would receive a storm sewer and new bituminous
surface improvements would be provided to Minnesota Street and Bluff Avenue.
The purpose of this memo is to receive Council concurrence of replacing the storm sewer
system at this time. The City's cost from the storm drainage system is approximately
$290,000.00 and sufficient funds exist to pay for this improvement.
ALTERNATIVES:
1. Approve a motion to replace the sanitary sewer on Prairie Street, from 1 Avenue
to approximately 150 feet south with funding to be from the City's Sanitary
Sewer Fund.
2. Approve a motion to improve the Market Street storm sewer system, from 1
Avenue to the Minnesota River, with funding out of the City's Storm Drainage
Fund.
3. Do not approve replacing sanitary sewer on Prairie Street.
4. Do not approve improving Market Street storm sewer from 1 Avenue to the
Minnesota River.
5. Table for additional information.
RECOMMENDATION:
Staff recommends Alternative No. 1 and No. 2.
ACTION REQUESTED:
Approve a motion to replace the sanitary sewer on Prairie Street, from 1 Avenue to
approximately 150 feet south with funding to be from the City's Sanitary Sewer Fund.
Approve a motion to improve the Market Street storm sewer system, from 1 Avenue to
the Minnesota River, with funding out of the City's Storm Drainage Fund.
ENGR/ 2009 - PROJECTS /CR101- RECONSTRUCTION/ WORD /ADDITIONAL•SEWER
Abfe,
Bruce Long
Public Wor s Director
Imo&Fe lle
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APPROVED FOR ONE YEAR FROM 7+75 DATE:
CITY ENGINEAN MILS
MT IL II RS MANAGER OATS:
20 10 0 20 40
SCALE IN FEET
B.Y. ELEV - 7
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INT. ALLEY 6 PRA
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MINNESOTA RIVER
OPTION 1 - USE EXISTING OUTLET.
DO NOTHING.
tar •
a;
OPTION 2 - REPLACE EXIST NG PIPE
IN MARKET STREET TO THE RIVER.
N -A - US EXIST NG PIPE
FROM CSAH 101 TO BLUFF AVENUE.
INSTALL SEPARATE PIPE ON MINNESOTA & BLUFF
NO INTERCONNECTION AT MARKET ST. & CSAH 101.
0 ON 8 - SA AS 3A WIT
INTERCONNECTION AT MARKET ST. & CSAH 101
TO MEET THE 10 -YEAR EVENT CAPACITY FOR THE
ENTIRE DRAINAGE AREA.
OPTION 2 - REPLACE EXISTING PIPE
FROM CSAH 101 IN MARKET ST. . -R1. -
OPTION 3A & 3B - REPLACE SYSTEM TO RIVE
OPTION 3A d 3B
MINNESOTA STREET -BLUFF AVENUE
STORM SEWER OUTLET TO RIVER
BLUFF AVENUE
OPTION 3A - NO INTERCONNECTION. - .
OF STORM SEWER FROM THE SOUTH. I
1ST AVENUE (CO. RD. 101)
OPTION 3B - INTERCONNECTION
OF STORM SEWER FROM THE SOOTN.
2ND AVENUE
1
i
0 100 200
SCALE IN FEET
SHAKOPEE
J 00851 Market Ontinn 3 .don 1/19/2011 3.01.56 PM
CSAH 101 RECONSTRUCTION
S.P. 70- 701 -07 C.T.B.& C.P. 101 -07
MARKET STREET STORM SEWER
IMPROVEMENTS TO MINNESOTA RIVER
SHAKOPEE,MINNESOTA
Scott
Bruce Loney
From: Chris Chromy [chrisch @bolton - menk.com]
Sent: Wednesday, January 12, 2011 2:16 PM
To: Bruce Loney
Cc: Rasmussen, Mitch; Felt, Greg; Don Sterna; Tom Voll; Dena King
Subject: CH 101 Storm Outlet
Attachments: 100851 Market Option 2.pdf; 100851_Market_Option_3.pdf; Cost Est_Market Storm Sewer
Opt 2.pdf; Cost Est_Market Storm Sewer Opt 3.pdf
Bruce —As we've been discussing, we have evaluated several options for the CH 101 storm outlet condition at Market
Street. I have summarized each option below:
Option 1— No Build
Under this condition, the existing 48" pipe under Market Street would remain and be the primary outlet for the
proposed CH 101 storm sewer. This pipe does not have the capacity sufficient to handle the upstream (pass- through)
flow much Tess the CH 101 drainage. It is anticipated the pipe is able to handle a 2 - yr event. Based on discussions
regarding the televising report; the existing 48" CMP north of Bluff Ave has several areas with significant rust.
Option 2 — Market Street Replacement
Under this condition, the existing 48" pipe under Market Street would be replaced with a 60" pipe and continue to serve
a dual purpose outlet for the upstream (pass- through) flow and the CH 101 outlet. The 60" pipe, if replaced to its outlet
at the MN river, would handle a 10 -year event.
The additional engineering and construction costs associated with this option are estimated at approximately $395K; of
which an estimated $295K would be local costs.
Option 3 — Minnesota to Bluff Ave Outlet
Under this condition, the existing 48" pipe under Market Street would remain to handle the upstream (pass through)
flow only. The CH 101 storm sewer would be redesigned and a new outlet pipe would be installed on Minnesota and
Bluff Avenue. The new, 48" RCP would intersect and rejoin the existing outlet pipe at the intersection of Market and
Bluff and a new 60" RCP would be extended to the MN River. The new outlet (48" and 60 ") pipe would handle a 10 -year
event.
The additional engineering and construction costs associated with this option are estimate at approximately $440K; of
which an estimated $290K would be local costs.
The consultant design team recommends either option 2 or 3 be selected to address the outlet capacity deficiency of the
system and deteriorated RCP north of Bluff Avenue. Although a more costly and complicated option, we prefer option 3
for the following reasons:
• Local cost share is expected to be relatively equal. Note: The cost share has not yet been determined for
option 3 by State Aid and all estimated costs are subject to change during the bidding process.
• Separation of CH 101 outlet from the existing upstream (pass- through) flow on Market Street is expected to
increase CTB eligibility considerably.
• Bituminous surface improvements would be included on Minnesota Street (1- block) and Bluff Avenue (1- block)
where storm sewer construction disturbs existing surfacing. Both are in relatively poor condition.
• Option 2 would disturb a one -block section of urban street on Market street. This street is in relatively good
condition.
We need clear direction within the next week in order to proceed with survey, engineering, and permitting for inclusion
in the CH 101 project. I am preparing an amendment for our design contract and will submit to Scott County upon
1
getting the direction on the preferred option. The amendment will include further detail on project delivery costs
associated with the selected option.
If you have any questions, please contact me directly. I have attached a sketch and cost estimate for both options 2 & 3.
Thanks! - Chris
Christopher S. Chromy, P.E., P.T.O.E.
Senior Transportation Engineer
Bolton & Menk, Inc.
Consulting Engineers & Surveyors
12224 Nicollet Avenue
Burnsville, MN 55337 -1649
P: (952) 890.0509 ext. 2428
M: (612) 756.1236
www.bolton - menk.com
DESIGNING FOR A BETTER TOMORROW
TRUNK:
Cash Balance January 1
Revenue - City SAC
Revenue - Trunk Charges
Expenditures per List- SEWER -T
Excess (Deficiency)
Balance Available 12/31
BASE:
Cash Balance. January 1
Revenue -- Monthly Flat Fee,
Revenue - Flow charges
Metro SAC Credits.
Revenue - Interest
Operation Expenses
Treatment Costs
Capital Equipment.
Transfer to General Fund
Expenditures per List- SEWER -B
Excess (Deficiency)
Balance Available 12/31
Total Balance 12/31
Accumulated Depreciation
Sanitary Sewer Fund
Projected Cash Levels
2011 -2015 Capital Improvement Program
City of Shakopee, Minnesota
2011 2012 2013
1,014,200 $
100,000
20,000
120,000
1,134,200
13,541,400
598,000
1,928,000
500,000
363,890
(669,090)
(2,478,710)
(55,000)
(50,000)
(980,000)
(842,910)
12,698,490
'13,832,690 $
9,912,418 $
1,134,200 $
80,000
20,000
(180,000)
(80,000)
1
12,698,490
598,000
1,985,840
500,000
345,820
(679,340)
(2,553,000)
(250,000)
(50,000)
(390,000)
(492,680)
12,205,810
13,260,010 $
1,054,200 $
80,000
20,000
(170,000)
(70,000)
984,200
12,205,810
598,000
2,045,415
300,000
331,500
(713,307)
(2,629,590)
(50,000)
(240,000)
(357,982)
11,847,828
10,662,418 $ 11,412,418
2014
984,200 $
80,000
20,000
(200, 000)
(100,000)
884,200
11,847,828
598,000
2,106,778
320,800
(748,972)
(2,708,478)
(50,000)
(20,000)
(501,872)
11,345,956
2016
884,200
80,000
20,000
100,000
984,200
11,345,956
598,000
2,169,981
305,750
(786,421)
(2,789,732)
(50,000)
(275;000)
(827,422)
10,518,534
12,832,028 $ 12,230,156 $ 11,502,734
TRUNK:
Cash Balance January 1
Revenue - Trunk Charges
Expenditures per List- Storm -T
Excess (Deficiency)
Balance 12/31
BASE:
Cash Balance January 1
Revenue - User Fees.
Revenue - Grant
Revenue - Interest
Operation Expenses
Capital Equipment
MOOT Payment
Transfer to General Fund
Expenditures per List
Expenditures per List - Grant
Excess (Deficiency)
Balance 12/31
Total Balance 12/31
Accumulated Depreciation
Surface Water Fund
Projected Cash Levels
2011 -2015 Capital Improvement P
City of Shakopee, Minnesota
2011
5,143,510 $
20,000
20,000
5,163,510
2012
5,163,510 $
20,000
(410,000)
(390,000)
4,773,510
12,211,420 12, 281, 390
1,091,000 981,900
433,870 436,120
(759,900) (780,610)
(120,000)
(50,000) (50,000)
(525,000)
69,970 587,410
12,281,390 12,868,800
17,444,900 $ 17,642,310 $
10,121,760 $ 10,801,760 $
2013
4,773,510 $
20,000
12,868,800
981,900
441,060
(819,641)
(275,000)
2014
4,793,510
20,000
2015
4,813,510
20,000
20,000 20,000
20,000
4,793,510 4,813,510 4,833,510
13,097,120 12,485,667
981,900 981,900
500,000
447,270 432,480
(860,623) (903,654)
(50,000) (50,000) (50,000)
(50,000) (1,630,000) (310,000)
228,320 (611,453) 150,726
13,097,120 12,485,667 12,636,393
17,890,630 $ 17,299,177 $ 17,469,903
11,481,760