HomeMy WebLinkAbout2023-09-18 I01F_03 NE Outfall Sewer_Change Order 1AGENDA ITEM:
CITY OF WAUKEE, IOWA
CITY COUNCIL MEETING COMMUNICATION
MEETING DATE: September 18, 2023
AGENDA ITEM:Consideration of approval of Change Order No. 1 to S.J. Louis
Construction, Inc. for the Northeast Outfall Sewer project increasing the
contract amount by $35,604.56.
FORMAT:Consent Agenda
SYNOPSIS INCLUDING PRO & CON: Change Order No. 1 is to document modifications to
the construction contract, plans and specifications for this project. It includes the addition of a 12”
gate valve, disposal of rubble, 156th Street manhole raise, water main relocation offset, and the
removal of a fiber at 156th Street necessary for construction of the sanitary sewer.
FISCAL IMPACT INCLUDING COST/BENEFIT ANALYSIS: The net result of this
Change Order increases the contract price in the amount of $35,604.56.
COMMISSION/BOARD/COMMITTEE COMMENT:
STAFF REVIEW AND COMMENT:
RECOMMENDATION: Approve the change order.
ATTACHMENTS: I. Change Order No. 1
II. Letter of Recommendation
PREPARED BY:Beth Richardson
REVIEWED BY:Sara Kappos SKK
PUBLIC NOTICE INFORMATION –
NAME OF PUBLICATION:
DATE OF PUBLICATION:
I1F3
275354 Page 1 of 3
September 12, 2023 CHANGE ORDER NO. 1
WAUKEE, IOWA
NORTHEAST OUTFALL SEWER
Change Order No. 1 is to document modifications to the construction contract, plans and
specifications for the Northeast Outfall Sewer project.
Item Description Unit Quantity Unit Price Total Price
1.16 12” Gate Valve EA 1 $5,500.00 $5,500.00
2.1 Disposal of Rubble LS 1 $4,700.00 $4,700.00
2.2 156th Street Manhole Raise LS 1 $13,800.00 $13,800.00
2.3 Water Main Relocation Offset LS 1 $6,800.00 $6,800.00
2.4 156th Street Fiber Removal LS 1 $4,804.56 $4,804.56
Total $35,604.56
PLANS
Dwg No. WMW.1, delete drawing and replace with attached Dwg No. WMW.1 REV 1.
SPECIFICATIONS
PART 9 – WATER MAINS AND APPURTENANCES
Page 9-6 under 4. PIPE INSTALLATION add the following after subparagraph 4.17:
“4.18 Vertical separation of water mains crossing over or under any storm sewer should
be at least 18 inches measured between the outside edges of the water main and
the storm sewer. Maintain the maximum feasible separation distance in all cases.
Ensure the sewer and water pipes are adequately supported. Use a low
permeability soil for backfill material within 10 feet of the point of crossing.
4.18.1 When impossible to maintain an 18 inch vertical separation when the water
main crosses over the storm sewer, maintain a minimum vertical separation
of 6 inches and utilize one of the following within 10 feet measured edge-to-
edge centered on the crossing:
275354 Page 2 of 3
4.18.1.1 Construct the water main of ductile iron pipe with gaskets
impermeable to hydrocarbons.
4.18.1.2 Enclose the water main in a watertight casing pipe with
evenly spaced annular gap and watertight end seals.
4.18.1.3 Construct storm sewer pipe of water main materials.
4.18.1.4 Construct storm sewers of reinforced concrete pipe with
gaskets manufactured according to ASTM C 443.”
Page 9-7, paragraph “6.2 Pressure and leakage test:” delete 6.2.2 and add the following:
“6.2.2 Flush water main before test to remove air and construction debris; insert
taps to release trapped air; flush at water flow rate which will provide
approximately 3.0‘ per second velocity in water main.”
Page 9-8, under 6. TESTS delete 6.3 and 6.3.1 and add the following:
“6.3 Required flow and openings to flush water mains with 40 psi pressure in water main:
Flow Required Number of
for Approx. Size of Tap, in. 2 1/2 in.
Water Main 3.0 ft/sec. 1 1 1/2 2 Hydrant
Diameter, in. Velocity, gpm. Number of Taps Nozzles
12 1,060 - - 2 2
6.3.1 Measure flow rate with pitot gauge if pressure is other than 40 psi in new
water main; ensure flow rate is 3.0’ per second, or greater.”
72+00
74+0075+0076+0077+00
CONSTRUCTION LIMITS
CONSTRUCTION LIMITS
CITY OF
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PROPOSED BLOW-OFF HYDRANT
STA. 103+21.50
N=596261.68
E=1546374.98
45° BEND
STA. 100+51.72
N=596111.71
E=1546599.05
PROPOSED TEST PORT
STA. 103+26.50
N=596264.46
E=1546370.82
1
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101+00102+00103+00
CONNECTION TO EXISTING
STA. 103+41.50
N=596274.76
E=1546360.90
12" WATER MAIN
45° BEND
STA. 103+36.52
N=596270.02
E=1546362.43
12" GATE VALVE
REMOVE EXISTING BEND
AND CONNECT TO
EXISTING WATER MAIN
STA. 100+00.00
N=596060.11
E=1546595.57
NEW WATER MAIN TO BE SEPARATED FROM NEW SEWER
BY AT LEAST 3' HORIZONTALLY AND 1.5' VERTICALLY.
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STA. 100+20.00
N=596080.06
E=1546596.95
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12" WATER MAIN
30" SANITARY SEWER
CONNECTION TO EXISTING
8" PIPE
45° BEND PROPOSED TEST PORT
GATE VALVE
CONNECT TO EXISTING WATER MAIN
45° BEND
PROPOSED TEST PORT
PROPOSED BLOW-OFF HYDRANT
21" EXISTING PIPE
DWG. NO.
PROJECT
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SCALE
DRAWN
CHECKED
APPROVED
DATE
ISSUED FOR
DATE REVISIONS
3000 Westown Parkway ● West Des Moines, Iowa 50266-1320
515-225-8000 ● 515-255-7848(FAX) ● 800-241-8000(WATS)
NORTHEAST OUTFALL SEWER
CITY OF WAUKEE
275353
PLAN AND PROFILE
WATER MAIN
MWM.1
AS NOTED
SRS
ARW
JDK
REV. 1
-
12-16-22
1-13-23 MINIMUM SEPARATION CALLOUTS ADDED AT SEWER CROSSINGS IN PROFILE
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