HomeMy WebLinkAboutA008 - Resolution accepting 2021/22 Stormwater Detention/Retention Maintenance Program project as completed by Tallgrass Land Stewardship Co., of Waukee, Iowa in the amount of $152,395.50ITEM #:8
DATE:12-23-25
DEPT:PW
SUBJECT:2021/22 STORMWATER DETENTION/RETENTION MAINTENANCE
PROGRAM - (NORTHRIDGE HEIGHTS POND)
COUNCIL ACTION FORM
BACKGROUND:
This annual program provides for long-term maintenance of stormwater detention facilities
within the City of Ames. These facilities provide regional stormwater detention and retention
across the community.
As a standard provision of developers' agreements, the City of Ames has responsibility
for the long-term maintenance of many of these facilities in residential areas. As these
facilities age, sediment accumulates, volunteer vegetation becomes more prevalent, erosion
occurs, and structures need to be improved. The program location for this project was the
Northridge Heights Pond.
On April 9, 2024, City Council awarded the contract to Tallgrass Land Stewardship Co., of
Waukee, Iowa in the amount of $111,600. To date, staff and City Council have approved eight
change orders totaling $37,258.50. Change Order No. 9 (balancing), administratively
approved by staff, resulted in an increase of $3,537. The balancing change order reflects the
actual measured quantities completed during construction. Construction was completed in
the amount of $152,395.50.
Revenue and expenses associated with this program are estimated as follows:
Description Available Revenue Expenses
21/22 Stormwater Det/Ret (Stormwater Utility
Fund)$150,000.00
Project Savings in Stormwater Utility Fund 50,000.00
Construction (As Bid) $111,600.00
Change Orders (Previously approved) 40,795.50
Final Construction (This Council Action) 152,395.50
Engineering/Administration 35,000.00
TOTAL $200,000.00 $187,395.50
Remaining revenue will be returned to the Stormwater Utility Fund and prioritized for future
stormwater projects.
ALTERNATIVES:
1. Accept the 2021/22 Stormwater Detention/Retention Maintenance Program (Northridge
Heights Pond) project as complete by Tallgrass Land Stewardship Co., of Waukee,
Iowa, in the amount of $152,395.50.
2. Direct staff to pursue changes to the project.
1
CITY MANAGER'S RECOMMENDED ACTION:
This project has been completed in accordance with the approved plans and
specifications. Therefore, it is the recommendation of the City Manager that the City Council
adopt Alternative No. 1, as noted above.
ATTACHMENT(S):
Project Map.pdf
2
G(
D
)
G(D
)
G(D
)
G(D
)
G(D
)
G(D
)
G(D
)
G(D
)
G(D
)
G(D
)
G(D
)
G(D
)
G(D
)
G(D)
G(D)
G(D)
G(D)
G(D)
G(D)
G(D)
G(D)
G(D)
G(D)
G(D)
G(D)
M
M
E
T
TVTM
TVT
T
M
CP #5001
ERIC & BETH VAUGHN
3332 FOXLEY DR
CHUONG-TENG & LI-WEN TSENG
3326 FOXLEY DR
KENNETH & MARIE MCCUSKEY
3320 FOXLEY DR
MICHAEL & KRISTEN MYERS
3316 FOXLEY DR MARY & STEPHEN HOWELL
3308 FOXLEY DR JOHN & RUTH MACDONALD
3302 FOXLEY DR
KENNETH TALBERT & KAREN BREITLING
3807 BRIDGEPORT DR
JAMES & DIANNE JONES
3731 BRIDGEPORT DR
JOHN & JOAN FITZSIMMONS
3725 BRIDGEPORT DR
MATTHEW & RHONDA CARNEY
3719 BRIDGEPORT DR
JON & TINA RICHARD
3713 BRIDGEPORT DR
JOHN & BETH JOHNSON
3707 BRIDGEPORT DR
JIANHUA YANG
3701 BRIDGEPORT DR
StS(
C
)
StS(
C
)
EXISTING 54" APRON
RCP FL: 924.36 (SE)
EXISTING 54" APRON
RCP FL: 923.42 (NW)
CP #5002
EXISTING 48" APRON
RCP FL: 920.67 (NE)
EXISTING 48" APRON
RCP FL: 921.59 (SW)
EXISTING 18" APRON
RCP FL: 921.98 (SW)
EXISTING MH
RIM: 930.42
BOTTOM: 911.36
StS(D)
SD
SD
SD
SD
SD
SD
SD
SD
SD
SD
SD
SD
SD
SD
SD
SD
SD
SD
SD
SD
SD
SD
CP #5000
EXISTING 48" APRON
RCP FL: 923.52 (SE)StS
(
D
)
StS
(
D
)
StS
(
D
)
StS(C)
StS(C)
StS(C)
EXISTING INTAKE
15" FL: 939.54 (NE)
15" FL: 939.44 (SW)
EXISTING 15" APRON
RCP FL: 928.84 (NE)
St
S
(
C
)
St
S
(
C
)
St
S
(
C
)
EXISTING 36" APRON
RCP FL: 927.41
ACC
PCC
SHORT WIRE
FENCE
BRICK RETAINING WALL
STEPS
LANDSCAPE
GRAVEL
LANDSCAPE
GRAVEL
FL: 933.76
LANDSCAPE
GRAVEL
PCC
EXISTING MH
RIM: 931.85
StS(D)
STORM SEWER (UNKNOWN)
6" SUBDRAIN
6" SUBDRAIN
48" RCP STORM SEWER
54" X 88" ARCH
RCP STORM SEWER
15" RCP STORM SEWER
36" RCP STORM SEWER
ADS STORM SEWER
G(
D
)
G(
D
)
G(
D
)
G(
D
)
G(
D
)
G(
D
)
G(
D
)
G(
D
)
G(
D
)
G(
D
)
G(D
)
G(D)
G(D)
G(D)G(D)G(D)G(D)G(D)
E(
D
)
E(
D
)
E(
D
)
E(
D
)
E(
D
)
E(
D
)
E(D
)
E(D
)
E(D)
E(D)E(D)E(D)E(D)E(D)E(D)
G(D)G(D)
G(D)G(D)
G(D)G(D)G(D)G(D)G(D)G(D)
G(D)
G(D)
G(D)
E(D)
E(D)
E(D)
E(D)
E(D)
E(D)
E(D)E(D)E(D)E(D)E(D)
E(D)
E(D)
E(D)
E(
D
)
E(
D
)
E(
D
)
E(
D
)
E(
D
)
W(D
)
W(D)
W(D)
W(D)
W(D)
W(D)
W(D)
W(D)
W(D)
W(D)W(D)W(D)W(D)W(D)
W(
D
)
W(
D
)
W(
D
)
W(
D
)
W(
D
)
W(
D
)
W(
D
)
W(
D
)
W(D
)
W(D
)
W(D
)
W(D)
W(D)
W(D)
W(D)W(D)W(D)W(D)W(D)W(D)
EXISTING MH
RIM: 931.04
CP #5011
APPROXIMATE AREA OF
OBSERVED SEEPAGE IN SLOPE
20.00' STORM SEWER &
SURFACE FLOW EASEMENT
20
.
0
0
'
S
T
O
R
M
S
E
W
E
R
&
SU
R
F
A
C
E
F
L
O
W
E
A
S
E
M
E
N
T
30.00' P.U.E.
PERMENENT POOL
ELEVATION: 921.59
T
T
T
T
T
T
T
T
T
T T T T T T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T T T T T T
12" P
V
C
12" PVC
12"
P
V
C
N
0
GRAPHIC SCALE
80'40'120'
Clapsaddle-Garber Associates, Inc
1523 S. Bell Ave. Suite 101
Ames, Iowa 50010
Ph 515-232-1784
www.cgaconsultants.com
SHEET NO.
DRAWN:
CHECKED:
DATE:
DATE:
APPROVED:DATE:
PROJECT NO.DESIGNED:DATE:REVISIONNO.DATEBY DATEBYREVISIONNO.
J:
\
2
3
-
W
R
-
0
0
7
3
\
d
w
g
s
\
5
_
S
h
e
e
t
s
\
2
3
W
R
0
0
7
3
-
C
.
2
0
1
(
C
o
n
s
t
r
u
c
t
i
o
n
B
o
u
n
d
a
r
y
)
.
d
w
g
-
C
.
2
0
1
C
O
N
S
T
R
U
C
T
I
O
N
B
O
U
N
D
A
R
Y
-
0
1
-
2
5
-
2
4
-
1
1
:
2
1
a
m
-
r
w
a
2
8
6
CGA NORTHRIDGE HEIGHTS STORM WATER FACILITY REHAB
C.201
23-WR-0073
AMES, IOWA CONSTRUCTION BOUNDARY
JMG
JMG
MMB
TSM ----
----
----
----
CONSTRUCTION NOTES:
CONSTRUCTION ENTRANCE. TO BE RESTORED AFTER PROJECT
COMPLETION.
CONSTRUCTION LIMITS.
A
B
B
B
B
B
B
B
B
B
B
B
A
A
A
GENERAL NOTES:
ALL AREAS WITHIN CONSTRUCTION LIMITS SHALL BE RESTORED TO
ORIGINAL CONDITIONS OR BETTER.
THIS PROJECT IS LOCATED IN A HOMEOWNERS ASSOCIATION COMMON
PROPERTY. THE CONTRACTOR SHALL USE CAUTION TO NOT DISTURB
INDIVIDUAL HOMEOWNERS PROPERTY OUTSIDE OF THE PROJECT
LIMITS TO ENSURE THE SAFETY OF THE PUBLIC DURING
CONSTRUCTION.
CONSTRUCTION DETAILS
STABILIZED CONSTRUCTION ENTRANCEC.501
3
C.501
3
5.00'
35.00'
3