CR 2003-140 Street & Utility Improvements First Street N.
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. CITY OF
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September 16, 2003
HOPKINS
Council Report 2003-140
Order Feasibility Report
2004 Street & Utilitiy Improvements
First Street North
City Project 03-10
Proposed Action
Staff recommends adoption of the following motion: Move that Council adopt
Resolution 2003-085, Resolution Ordering the Preparation of a Feasibility Report For
2004 Street and Utility Improvements.
This action is the first step in the process of improving selected streets in 2004 and
assessing abutting properties per City assessment policy. A petition to improve any of the
proposed streets has not been submitted to the City.
Overview
The 2004 - 2008 CIP identify street and utility improvements for the year 2004 along 1 st
Street North from 17th Avenue North to 21st Avenue North. The first step in proceeding
with the 2004 project is ordering a feasibility report. The process this year will be
slightly different, City staff will draft the report rather than having a consultant produce
it. Some supplementary information will be needed for the report such as Topographic
survey and geotechnical background information. Staff will request quotes for these
services and bring contracts to the council for approval at a future date. At this time staff
is requesting City Council approval to proceed with the preparation of a feasibility study
for the 2004 Street & Utility Project.
Primary Issues to Consider
. Project background
. Why order a feasibility report?
. Project budget
Supporting Information
. Project Location Map
· 1998, Feasibility Report - Storm Water Flooding Analysis, RCM, Inc.
· 2003, Feasibility Report - Shady Oak Pond Outlet, SEH, Inc.
· Resolution 2003-085
~o~tYEngineer
Financial Impact: $ 25.000 Budgeted: YIN l Source: Utility Funds, PIR Funds,
Special Assessments Related Documents (CIP, ERP, etc.): CIP
Notes:
.
Council Report 2003-140
Page 2
Primary Issues to Consider
. Project background
The scope of the proposed 2004 Street and Utility Improvement Project is
intended to deal with two issues, pavement condition and drainage
improvements. The pavement condition on first Street North from 1 ih Avenue
North to 21st Avenue North was last evaluated in 2000. The pavement condition
index (PCI) for these blocks of 1 st Avenue North range between 40 and 67. PCI
ratings in the 40's and 50's generally indicate some type of maintenance is
needed. This maintenance could range anywhere between a mill and overlay to a
full street reconstruction. One goal of the feasibility study will be to determine
the best way to manage this piece of roadway infrastructure to maintain its value.
In the 1997 Hopkins Flood Response Action Plan adopted by the Hopkins City
Council, the area of 1 st Street North and 18th Avenue North was identified as Area
No.3. In 1998 a feasibility report was produced that discussed several steps to
alleviate flooding in Area No.3. Subsequent to that report some of the
improvements have been implemented. The final recommendation listed, in the
1998 report, to alleviate flooding in Area No.3 is to increase the pipe size of the
existing storm sewer system from 18th Avenue North to Shady Oak Pond. A more
detailed report analyzing the entire Shady Oak Pond system was completed in
May of 2003 by SEH Inc. The recommendation in that report suggests the
existing pipe to be replaced with a 36-inch pipe.
. Why order a feasibility report?
Minnesota Statute No. 429 - Assessment Procedures, requires preparation of a
feasibility report on assessed projects. The report will provide preliminary
engineering information, project cost estimates and preliminary assessment
amounts to help City Council decide whether or not to proceed with the project. It
is also used to present and discuss the project with the abutting residential and
commercial owners.
. Project budget
The 2004 CIP budget for this project is $371,000 ($90,000 from the City PIR
fund, $200,000 from special assessments, and $81,000 from the Storm Sewer
Utility Fund). These are estimates and are open to change contingent on level of
improvement and extent of utility work.
THE CITY Of
HOPKINS, MINNESOTJ
HENNEPiN COUNTY
SCALE
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Feasibility Report
Storm Water Flooding Analysis
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Area 2 :.. Uilltop Park
'Area 3 -Alley Between 17th &. 18th Avenues North
Area 4 - 13th Avenue North - Maetzold Field
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nopkins, .l\IN
ReM File No. lO1l41
March t998
10001 red drcle drive · box 130 · mlnnatonka, mn 55343 · (612)935-W01 · fax (612)935-8814 l.Clll
AREA-3: 17TH AND 18TH AVENUES
ISSUES:
This local low area is located ill the alley between 17th and 18th Avenu~s, south of Ist Street North
(Figure 2). There is a 12" storm'sewer system provided to drain this localized low area. This stOIDl
sewer system connects to the system in 1st Street North which connects to the 17th Avenue North
system. This area floods whenever the storm water run-off exceeds the inlet capacity of the system.
'During July 1997, this problem was exaggerated due to street construction at the intersection of 1st
. Street North and 18th Avenue North.
ANALYSIS:
.
ReM conducted a field sUIVey of the localized low area in the alley south of 1st Street North between
17th Avenue and 18th Avenue to verify existing stonn sewer elevations on 1st Street as well as the
topography adjacent to the low area in the alley.
The localized drainage area directly tributary to the low'point in the alley is 2.5 acres (Figure 5).
There is an inlet at the low point (elevation 925.9) :with a manhole ring casting and a Neenah R-4370
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type D heavy duty drainage grate. The inlet capacity of this drainage grate with 0.6 feet head
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(elevation 926.5) not clogged is 3.35 cfs. The drainage grate has I I/2-inch wide slotted openings
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which will allow the opening to become e,asily clogged. For design purposes, 1/2 clogged cond~tion
of the inlet capacity is assume~ which lowers the inlet capacity with 0.6 feet head to 1.7 cfs. The 0.6
. ,
foot head or water level of926.5 was selected to protect existing garages. The 2:5 acre drCi;inage area
generates 2.9 cfs, 3.5 cfs and 4.1 cfs runoff based upon a 2 year, 5 year and 10 year return period.
.
Stonn sewer piping from the catch basins in the alley is a 12-inch at 0.4% north to 1st Str~et, then
a 12-inch at 0.73% east to 17th Street that connects to a 27 inch storm sewer drainage southon 17th
Avenue. Capacity of the 12-inch full pipe is 2.4 cfs. Surcharged to a water level of926.S, the, 12-
. inch pipe can carry 4.0 ,cfs. A full pipe has the capability to handle a 2 year return frequency but
surcharged to 926.5 has the capacity to cany a 10 year return storm.
12
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. The localized low area is adjacent to a low area at 1st Street North an!i 18th Avenue. This
intersecdon collects surface water from a 45 acre drainage area (Figure 6). Some of this surface
.runoff is collected ,in the storm system on 17th Avenue btlt the majority is collected in the stonn
system along 1st Street. The surface water runoff from the 45 acre drainage area is 43 cfs, 54 cfs and
63 cfs for a 10 year, 50 year and 100 year return frequency.
The existing stonn sewer canying surface water away from Ist and 18th Avenue is an 18~inch to the
west and a 12~inch to the east. The.12~inch connects to the 17th Avenue system and drams the alley
area as well.
~we use elevation 926.5 as the water level in the low area of the alley and surcharge the pipeline on
.15t acc.ordingly, the storm sewer capacity of the 18-inch at 0.04% grade west of 1st and 18th is 14
cfs and the capacity of the 12-inch east 0111st is 4.0 cfs. All contributing flow to these lpw areas in
. .,.excess of 18 cfs will-pond higher than the 926.s-elevati.on (see Figure 7).
.
RECO:M1v.1ENDATION:
There are three situations which cause localized flooding in this area. The first is inadequate inlet
capacity in the alley area to allow the stonn water to enter into the existing stonn sewer pipe system.
The second is the overland flow which collects at this location when the existing storm sewer pipe
- .
system is at capacity. The third is there is no outlet control at Shady Oak Pond. We recommend
I
improvements to this area in three phases.
Phase 1 construction would be to increase the inlet capacity in the alley area to equal that of the
existing pipe capacity. The.second part to Phase 1 would include the reconstruction of the concrete
apron entrance to the alley to contain the overland flow within 1st Street North easterly to the 17th
Avenue North drainage system. The third part to Phase 1 would be to bulkhead the existi11g stonn
sewer connection from the west which allows the 18th Avenue North and 1st Street North pipe
system to back flow into this alley area.
13
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Phase 2 of construction would include the fo1l9wing:
· Increase the pipe size from the alley to the eXisting stooo sewer system in 17th Avenue North,
· Lower the intersection of 18th Avenue North and 1 st Street North to allow for the overland
drainage to this point to enter this storm sewer pipe system, and
.' Increase the pipe size ofthe existing stonn sewer system from 18th Avenue North to Shady
Oak pond. -
.
Ph~e 3 construction would include the installation of outlet control at Sh?-dy Oak Pond. The outlet
can be constructed before the Shady Oak Road upgrade or in conjunction with the planned upgrade
of Shady Oak Road in 2001., Given the past flooding experienced v.rith Shady Oak Road, the City
should seriously consider the pond outlet control along with the pond improvements identified for
1999.
The cost of the Phase 1 improvements is estimated at $5,000 including engineering and
administration. This improvement can be best be constructed as a change order to an existing City
contract.
.
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FEASIBILITY REPORT
Shady Oak Pond Outlet
Hopkins, Minnesota
SEH No. A-HOPKN0202.00
May, 2003
,"~SaJ
SHORT ELLIOTT HENDRICKSON INC
Multidisciplined.
Sinole Source.
6.1.4.4 Lift Station, Minnetonka Culvert Crossing, and Island Dred!!ing
Considering the proposed lift station, a 21-inch Rep culvert crossing
to Minnetonka's jurisdiction, and dredging the islands, the pump size
is 1200 gpm, the force main size is a 16-inch DIP, and the gravity
system size is an 15"':inch RCP. Peak discharge for the proposed lift
station and crossing is.3 cfs and 10 cfs, respectively. Peak elevation of
Shady Oak Pond is 923.08 feet.
6.2 18th Ave N and 1s~ St N Flood Mitigation Options Considered
6.2.1 Replace Existing System and Inlets
The intersection of 18th Ave Nand 1st St N floods during large storms
due to inadequate capacity of the existing storm sewer system. The
capacity of the existing storm sewer system is limited by an I8-inch
Rep that allows 14 cfs to flow west towards Shady Oak Pond. The
total inlet capacity of the inlets at the intersection is approximately 8
cfs. The intersection collects runoff from approximately' 35 acres.
The boundary is shown in Figure 10 (Appendix A). The peak runoff
for the 35-acre catchment area is summarized in Table 1. .
Table 1
Peak Flows
.
Event Peak Flow (cfs)
2-yr/24-hr 28
5- yr/24-hr 37
1O-yr/24-hr 42
Upstream of the intersection the total inlet capacity is approximately
20 cfs. To alleviate flooding the inlet capacity at the intersection and
the storm sewer system capacity to Shady Oak Pond must be
improved.
Replacing the existing storm sewer system from the intersection to the
pond with a 36-inch RCP at 0.45 % will increase the capacity to 45
cfs. Replacing existing inlets with more efficient grates will
approximately double the inlet capacity. With the proposed
improvements in-place the intersection will be protected from flooding
during a 1O-yr/24-hr storm. The average depth of the proposed storm
sewer system is 10 feet. Because of the d~pth of the proposed stom
sewer system, 1st St N would need to be reconstructed from curb to
curb.
The City of Hopkins' Capital Improvement Plan (eIP) indicates street
improvements for 1st 5t N are scheduled for 2004. Constructing this
storm sewer improvement in conjunction with the CIP street
Shady Oak Pond Feasibility Report
A-HOPKN0202.00
P::lm> 1?
.
improvements would reduce the construction costs of replacing the
storm sewer. The cost breakdown between street replacement and
storm sewer replacement is in Appendix C.
6.2.2
Split Flow into Proposed Pond Outlet
This option considered splitting flow from the intersection into the
proposed pond outlet (option IT or IV) flowing south on 18th Ave.
However, because the proposed outlet connects to an existing storm
sewer system that surcharges from large storms, flood mitigation at the
intersection would be minimal.
7.0
7.1
Financing'
Opinion ,,~ Probable Costs'
Detailed opinions of probable costs were developed for all options and
improvements discussed in this report. They can be found in
Appendix C.
The totals in Table :2 show the opinion of probable cost assuming all
improvements recommended in this report are constructed under the
same contract.
Option I will benefit from a cost sharing program with Hennepin
County based on contributing drainage area of the shared storm sewer.
Table 2
Opinion Of Probable Cost
Improvements Option I
Pond Outlet $ 876,500*
1 S1 St N Storm Sewer $ 268,500
. .. 1st St N Street $ 1~7 ,600
Total $ 1,312,600*
* Figure does not reflect County cost sharing benefit
7.2 Proposed Financing .
The 15t St N storm sewer improvements to mitigate flooding at the
intersection of 18th Ave N and 1st 8t N would be funded through the
City's storm sewer utility. fund.
The Shady Oak Pond outlet would be funded through the City's storm
s~wer utility fund.
The cost of street reconstruction for 151 S t N from Shady Oak Pond to
18th Ave N would be funded through the City's Capital Improvement
Plan for street improvements.
Shady Oak Pond Feasibility Report
U"""""I,I...,.. "Ai....................."'"
A.HOPKN0202.00
M_ __ ..,...
.
If Option I for the Shady Oak Pond outlet is implemented, it is
possible that the City would enter into a cost sharing program with
Hennepin County to defray a portion of the cost to the COl.l:nty.
8.0
Project Schedule
This project would benefit if combined with other projects by taking
advantage of lower unit prices on larger projects. Coordinating
construction with Hennepin County and the City's eIP plan is
important in reducing the cost of this project.
8.1 Tentative schedule for related projects:
Shady Oak. Road Reconstruction (County)
1st St N/lSth Ave N CIP Improvements (City)
2004-2005
2004
8.2 ~chedule for pO,nd Outlet and Flood Mitigation.
8.2.1 Option I
Culvert Crossing (with orifice restriction) 2003
1st 8t N/lSth Ave N Flood Mitigation 2004
Shady Oak Pond Outlet
2005
2005- ?
Remove restriction from culvert crossing
Raise 2nd 8t N
Future Phase
9.0 Project Contacts
Steve Stadler, PE
Public Works Director
City of Hopkins
1010 1st 8t S
Hopkins, 11.N 55343
Beth Peterson, PE
Project Engineer
Short Elliott Hendrickson
3535 Vadnais Center Drive
200 SEH Center
St. Paul, MN 55110
(651) 765-2901
Shady Oak Pond Feasibility Report
A-HOPKN0202.00
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ESTIMATE OF FLOOD MITIGATION
SHADY OAK POND OUTLET FEASIBILITY STUDY
PROPOSED SYSTEM REPLACEMENT ESTIMATE
SEH NO. AHOPKN0202.00
DECEMBER 2002
TOTAL COST STORM SEWER STREET CONSTRUCTION
ESTIMATED ESTIMATED ESTIMATED ESTIMATED ESTIMATED ESTIMATED
DESCRIPTION UNIT UNIT COST QUANTITY COST QUANTITY COST QUANTITY COST
MOBIUZATION LS :5 20,000.00 1 $ 20,000,00 o $ - 1 $ 20,000.00
DEWATERING LS :5 5,000.00 1 :5 5,000,00 1 $ 5,000.00 0 $ .
TRAFFIC CONTROL LS $ 5,000.00 1 :5 5,000.00 o $ . 1 :5 5,000,00
UTILITY SUPPORT LS $ 1,0,000.00 1 :5 10,000.00 1 $ 10,000.00 o $ .
BITUMINOUS REMOVAL SY :5 6,20 3100 :Ii 19,220,00 0 :5 . 3100 $ 19,220.00
CURB & GUTTER REMOVAL LF :5 3,60 2000 :Ii 1,200,00 0 $ . 2000 :5 1,200.00
CONCRETE REMOVAL SF $ 1.30 150 $ 195,00 0 :Ii . 150 :5 195,00
SAWCUT BITUMINOUS LF $ 1.25 224 $ 280.00 0 :Ii - 224 :Ii 280.00
SAWCUT CONCRETE LF :5 2.15 30 :5 64.50 0 :Ii - 30 $ 64.50
CLEAR & GRUB (TREES) EACH $ 250.00 o :5 0 :Ii - o $
REMOVE 48. MANHOLE EACH $ 250,00 6 :5 1,500.00 ~ $ 1,500.00 o :Ii .
REMOVE 2' x 3' CATCHBASIN EACH $ 250.00 4 :5 1,000.00 4 $ 1,000.00 o :Ii .
REMOVE 18. RCP SEWER LF :5 15.00 350 $ 5,250.00 350 $ 5,250.00 o $ .
REMOVE 24" RCP SEWER LF $ 15.00 580 :Ii 8,700.00 580 :Ii 8,700.00 o :Ii .
REMOVE 24" APRON EACH $ 250.00 1 :Ii 250.00 1 $ 250.00 o :Ii .
SHORING LF $ 10.00 100 :Ii 1,000.00 100 $ 1,000.00 o $ -
36" Rep SEWER PIPE LF $ 80.00 923 $ 13,840.00 923 :Ii 13,840.00 o $ -
PIPE BEDDING CV $ 20.00 185 $ 15,100.00 185 :5 15,100.00 o $ .
RIPRAP CV $ 40.00 10 :5 400.00 10 :Ii 400.00 o $ .
EXCAVATION CV $ 2.60 3500 :5 9,100.00 3500 :5 9,100.00 o $ .
BACKFILL CV $ 1.55 3140 $ 4.861.00 3140 $ 4,861.00 o $ .
.
48" MANHOLE EACH $ 2,500.00 4 $ 10,000.00 4 $ 10,000.00 o $ .
60. MANHOLE EACH $ 3,600.00 6 $ 21,600.00 6 :5 21,600.00 o :Ii .
36. FEsrrRASH RACK EACH $ 1,500.00 1 $ 1,500.00 1 :5 1,500.00 o $ .
CASTINGS EACH $ 450.00 10 :5 4,500.00 10 $ 4,500.00 o $ .
CONNECT EXISTING SewER EACH $ 700.00 6 $ 4,200.00 6 $ 4,200.00 o $ .
WEAR BITUMINOUS TON $ 55.00 257 $ 14,135.00 o $ - 257 $ 14,135.00
BASE BITUMINOUS TON $ 50.00 342 $ 17,100.00 o :5 . 342 $ 17,100.00
TACK GAL $ 2,95 155 :5 457.25 o :5 . 155 :5 457.25
B618 CURB & GUTTER LF $ 5.50 2000 $ 11,000.00 o $ . 2000 $ 11,000.00
6. CONCRETE PAVEMENT SV $ 21.00 17 $ 357.00 o $ . 17 $ 357.00
4. CONCRETE WALK SF $ 3.00 300 $ 900.00 o S . 300 S 900.00
CLASS 5 AGGREGATE BASE CV $ 17.50 519 $ 9,082.50 o :5 . 519 S 9,082.50
TOPSOIL CY $ 9.00 120 $ 1,080.00 o $ . 120 $ 1,080.00
SOD SY $ 2.10 1100 :5 2,970.00 o :Ii . 1100 $ 2,970.00
SILT FENCE LF :5 6.00 400 $ 2,400,00 400 $ 2,400.00 o $ .
TREES EACH $ 380.00 10 $ 3,800.00 o :5 . 10 $ 3,800.00
ROW LS :5 10,000.00 0 $ . 0 $ . 0 S .
SUBTOTAL $ 293,648.25 :5 180,807.00 $ 112.841.25
PLUS 10% CONSTRUCTION CONTINGENCIES $ 29,364.83 $ 18,080.70 $ 11,284.13
ESTIMATED CONSTRUCTION COSTS $323,013.08 $ 198,887.70 $ 124,125.38
PLUS 35% LEGAL, FISCAL, ADMINISTRATIVE AND ENGINEERING $113,054.58 :5 69,610.70 $ 43,443.88
OPINION OF PROBABLE PROJECT COST $436,067.65 $ 268,498.40 $ 167.569.26
PROPOSEDINLETEST.xls
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CITY OF HOPKINS
HENNEPIN COUNTY, MINNESOTA
RESOLUTION 2003-085
RESOLUTION ORDERING THE PREP ARA TION OF A FEASIBILITY REPORT
FOR YEAR 2003 STREET IMPROVEMENTS
WHEREAS, it is proposed to improve 1 st Street North between the west line of 1 ih
Avenue North and the east line of 21st Avenue North by reconstructing or rehabilitating the
pavement and to assess the benefited property for all or a portion of the cost of the improvement,
pursuant to Minnesota Statues, Chapter 429; and
WHEREAS, City staff is requesting that these streets be upgraded under the City's
assessment policy even though no petition for the upgrade has been submitted; and
WHEREAS, the first step in the assessment procedure is the ordering of a feasibility
report.
NOW, THEREFORE, BE IT RESOLVED, by the City Council of the City of Hopkins,
Minnesota, that the proposed improvements be referred to the City Engineer for study and that he
be instructed to report to the Council with all convenient speed advising the Council in a
preliminary way as to whether the proposed improvement is necessary, cost-effective, and
feasible and as to whether it should best be made as proposed or in connection with some other
improvement, and the estimated cost of the improvement as recommended.
Adopted by the City Council of the City of Hopkins, Minnesota, this 16th day of September,
2003.
Eugene J. Maxwell, Mayor
ATTEST:
Terry Obermaier, City Clerk