HomeMy WebLinkAboutPreliminary Comprehensive Sanitary Sewer Plan March 1999, File No. 55-99-101CITY OF OAK PARK HEIGHTS
Preliminary Comprehensive
Sanitary Sewer Plan
Oak Park Heights, Minnesota
March 22, 1999
File No. 55 -99 -101
Table of Contents
Executive Summary ............ ...............................
List of Figures
Concept and Staging Plan Map
Sanitary Sewer Map .................
List of Appendices
AppendixA ......................... ...............................
AppendixB ......................... ...............................
AppendixC ......................... ...............................
AppendixD ......................... ...............................
AppendixE ......................... ...............................
AppendixF ......................... ...............................
AppendixG ......................... ...............................
........................ Page 3
.......... ...........................Page 5
.......... ...........................Page 6
......... .......................... Areas for the Ultimate System
........ Average Flows (MGD) for the Ultimate System
.......... Design Flows (MGD) for the Ultimate System
.Existing/Proposed Design and Capacity Information
........ ............................... Trunk System Cost Estimate
............... ...........................Lift Station Cost Estimates
..... Phasing of Costs
City of Oak Park Heights
Preliminary Draft Comprehensive Sanitary Sewer Plan Page 2 of 6
Executive Summary
The Metropolitan Land Planning Act (amended 1995) requires local governments to prepare
comprehensive plans and submit them to the Metropolitan Council to determine their consistency
with metropolitan system plans. The local comprehensive plan is to include a sanitary sewer
element that covers the collection and disposal of wastewater generated by the community
describing current and future service needs from the Metropolitan Council Environmental
Services (MCES). The Preliminary Draft of the City of Oak Park Heights' Comprehensive
Sanitary Sewer Plan (Pre -Draft CSSP) presented herein gives the core results of the sewer plan to
date. The Pre -Draft CSSP —as will the Final CSSP —serves as an inventory of the existing trunk
sewer system and a guide for the expansion and upgrading of the City's trunk sewer system to
meet the future requirements of the City by accommodating anticipated growth.
The City of Oak Park Heights is located in the north - central portion of Washington County
positioned along the south side of State Highway 36 between Manning Avenue and the St. Croix
River. The local economy is based on a mixture of commercial and industrial activities. The
majority of these activities are located along the State Highway 36 corridor.
Currently, all wastewater collected in the City is conveyed to the Metropolitan Wastewater
Treatment Plant via the MCES Stillwater and Bayport Interceptors. The interceptors run north
from Bayport and south from Stillwater along State Highway 95 to the treatment plant, which is
located on the east side of State Highway 95 at approximately Upper 61" Street North. All
wastewater generated by the City enters the MCES Interceptor at a point near 59' Street North
and State Highway 95 and flows north to the treatment plant —with the exception of sub- districts
N -I and N -0; where sub - district N -1 discharges into the MCES Interceptor north of the treatment
plant and flows south and sub - district N -0 is the MCES Treatment Plant.
To accommodate anticipated growth patterns, the City plans to provide sanitary sewer service to
two major regions outside of the current City limits by the year 2015. The areas and staging
dates are shown on the attached Concept and Staging Plan Map taken from the City's Draft
Comprehensive Plan. The largest of the two regions is located south of the existing city
boundary between Stagecoach Road and Northbrook Boulevard. The other smaller region is
located north of 55' Street between State Highway 5 and Manning Ave. A portion of this region,
known as the Kern Center, has recently been annexed by the City and sewer plans and
specifications have been completed and are under contract for completion in 1999.
This report focuses on evaluating the existing trunk system and its associated lift stations and
locating future trunk lines and lift stations to efficiently and economically provide sewer service
to these two major regions. The location of smaller sewer laterals and service lines are
dependent upon future land development plats and cannot be accurately located from a study of
this type.
City of Oak Park Heights
Preliminary Draft Comprehensive Sanitary Seaver Plan Page 3 of 6
The modeling of the sanitary sewer system is based on a variety of parameters, such as: land use,
population density, standard wastewater generation rates, topography, and future development
plans. Based on the topography of the undeveloped areas, sanitary sub - districts were created and
the most cost - effective locations for future trunk line facilities were determined. To generate
potential flow rates for each sub - district, the area of each land use category was calculated within
each sub - district. These values are presented in Appendix A. With estimated population density
figures for each land use category and known unit rates of wastewater generation per capita, the
resulting product yields total wastewater flow for each sub - district. These values are presented in
Appendix B.
Design nodes are created along each trunk line where two or more pipes merge or the pipe
gradient or pipe size change enough to be hydraulically significant. The pipe capacity or design
flow is then calculated between the nodes. These values are presented in Appendix C. Appendix
D summarizes the proposed trunk lines and their basic design characteristics. Regardless of any
final adjustments in the routing and size of the trunk facilities that may take place as determined
by the specific land use conditions at the time of final design, the design criteria presented in this
report will provide the city with the most economical ultimate design capacity sanitary sewer
system.
The sanitary sewer map (attached) depicts the sanitary sewer sub- districts, layout of the existing
trunk sanitary sewer system and the general layout of the future or ultimate design sanitary sewer
system. Both the existing and the fully developed sewer system will include use of existing and
future lift stations and force mains.
The existing gravity lines in the system have been designed for and are anticipated to
accommodate the fully developed scenario for the City. At this time, the existing system has not
been checked to confirm that adequate capacity exists for the added areas to the west and south.
This will be completed as part of the final Comprehensive sanitary sewer plan. The proposed
future lines will need to be sized accordingly for full development.
Lift stations and force mains will be required to service certain areas. Sub- districts W11, 12, 13
& 14 will be serviced via lift stations W11LS and W13LS (W11LS is under contract for
installation in 1999). WI3LS has been proposed to provide service to the low -lying area in the
western part of sub - district W13. Due to the proposed staging of the expansion, an interim lift
station, W4LS, has been proposed to service sub - district W4. Lift stations W4LS and N20LS
can ultimately be eliminated with the completion of the trunk line in the southern district.
Upgrading of station W7LS will be inevitable to accommodate the expansion to the west. The
upgrade of WMS would likely be done in several phases since the increase of wastewater
generation from the western sub - districts will also come in phases. One such upgrade phase for
W7LS will have to include a 75 -foot extension of the force main to obtain increased capacity.
Construction cost estimates were developed for the completion of the ultimate trunk system and
are included in Appendices E through G. These trunk facilities typically include lift stations,
force mains and all gravity lines ten inches (10 ") in diameter and larger. In addition, any pipes
required to convey sewage from lift stations are included. The estimated cost to expand the trunk
sewer system and replace pipes with inadequate capacity is $2,100,000.
City of Oak Park Heights
Preliminary Draft Comprehensive Sanitary Sewer Plan Page 4 of 6
APPENDIX A - AREAS OF SEWER SUBDISTRIM
Arev
Dni nation
Restdential
Low Demih
Rnidenrial
Medium Denaih
Roideatial
Ri h Oemih
Commercial
Industrial
Acrol
Public
Ivtiwsional
Acrn
Park
Open Space
Acres
]on
D,eX able
Acresl
TOTAL
A<ra
Acra llnita/aceei
Ano Cmmlec.e
Acrn Lnicslane
..- . ....... ........
N -1
0
4
0
9
12
L'
9
0
0
0
21
N -2
0
4
0
9
0
I'_
158
28
12
9
208
N -3
21
4
0
9
0
12
3030
0
39
1
92
N -4
0
4
0
9
0
I2
1
0
39
5
45
N -5
47
4
0
9
2
12
0
0
0
0
49
N -6
V
7
4
0
9
8
12
3
49
0
0
67
N-7
0
4
0
9
6
12
21
5
0
0
33
N -8
0
4
5
9
3
12
2
0
0
0
II
N -9
0
4
12
9
II
12
5
1
0
0
30
N -10
IS
4
0
9
0
12
0
0
D
0
15
N -II
0
4
0
9
0
12
0
169
42
0
212
N -12
6
4
0
9
0
12
0
0
0
0
6
N -13
39
4
0
9
0
12
0
0
0
0
l9
N44
28
4
0
9
0
12
0
2
0
0
30
N -IS
2
4
0
9
0
12
12
0
0
0
14
N-16
0
4
0
9
0
1'-
31
0
0
0
31
N -17
14
4
0
9
0
12
6
0
4
0
24
N48
2
4
0
9
0
12
2
0
7
0
11
N -19
0
4
0
9
0
12
0
0
12
0
13
N-20
45
4
0
9
0
12
0
0
0
0
a3
Soblotai
213
18
42
281
256
ti'
I
997
w ss:.tA
_-- ... -... _.......
5 -I
7
4
0
9
0
1 12
34
0
8
0
49
S -2
0
4
0
9
0
12
61
0
D
0
61
S -3
3
4
0
9
20
12
0
0
3
0
25
S -4
72
4
0
9
0
12
0
0
0
0
72
S -5
36
4
0
9
3
I?
0
2 8
0
0
67
S -6
1
4
9
9
0
12
0
0
24
0
33
VW4
0
4
0
9
0
112
42
1
0
0
43
0
4
0
9
0
54
0
0
0
55
30
4
0
9
0
0
0
1
0
31
0
4
0
9
0
0
110
0
0
110
0
4
0
9
0
103
0
0
0
103
42
4
0
9
0
13
0
0
0
54
W -13
1 42
11 4
13
9
0
12
D
0
0
0
54
W -14
0
4
13
4
d
12
16
3
6
1
38
Subtotal
1 23T
35
1
1
323
1 141
1 36
1 1
]96
_-- ... -... _.......
5 -I
42
1 4
1 0
1 9
1 0
1 12
1 0
1 0
1 ]
1 0
I 49
S -2
349
4
0
9
0
12
0
0
3
0
352
S -3
i6
1
0
9
0
12
0
0
0
0
417
S -4
55
4
0
9
0
12
T6
0
0
0
131
S -5
37
1 4
1 0
9
1 0
I?
]4
0
0
11 0
111
S -6
21
1 4
1 0
9
0
12
74
1 0
19
1 0
114
Subtotal
920
0
0
1
1 224
1 0
1 29
1 0
1 1,1
TOTALS 1 1.378 52 70 1 1 828 1 397 1 221 1 18 1 2,966
Appendix A A -1
APPENDIX B - AVERAGE FLOWS FOR SEWER SUBDISTRICTS
Northern Dittriet
N -1
0.030
Commercial
Public
Park
Nan
0.041
Area
Residential
Industrial
Institiutional
Open Space
Developable
TOTAL
Designation
M1IGD
(NIGD )
(]IGD
MGD)
\IGD
31GD
Northern Dittriet
N -1
0.030
0.010
0.000
0.000
0.000
0.041
N -2
0.000
0.190
0.042
0.000
0.000
0232
N -3
0.020
0.036
0.000
0.000
0.000
0.056
N4
0.000
0.001
0.000
0.000
0.000
0.001
N -5
0.047
0.000
0.001
0.000
0.000
0.048
N-6
0.026
0.004
0.073
0.000
0.000
0.103
N -7
0.014
0.026
0.008
0.000
0.000
0.048
N -8
0.018
0.003
0.000
0.000
0.000
0.021
N -9
0.051
0.006
0.002
0.000
9.000
0.059
N -10
0.014
0.000
0.000
0.000
0.000
0.014
N -11
0.000
0.000
0.254
0.000
0.000
0.254
N -12
0.006
0.000
0.000
0.000
0.000
0.006
N -13
0.035
0.000
0.000
0.000
0.000
0.035
N -14
0.025
0.000
0.003
0.000
0.000
0.028
N -15
0.002
0.015
0.000
0.000
0.000
0.017
N -16
0.000
0.037
0.000
0.000
0.000
0.037
N -17
0.013
11.007
0.000
0.000
0.000
0.020
N -18
1 0.002
0.003
0.000
0.000
0.000
0.004
N -19
Ott
0.000
0.001
0.000
0.000
0.001
N -20
1 0.041
1 0.000
1 0.000
1 0.000
1 0.000
1 0.042
Subtotal
1 0.345
1 0.337
1 0.383
1 0.000
1 0.000
1 1.066
Western District
W -1
0.006
0.041
0.000
0.000
0.000
0.047
W -2
0.000
0.073
0.000
0.000
0.000
0.073
W -3
0.051
0.000
0.000
0.000
0.000
0.051
W-4
0.066
0.000
0.000
0.000
0.000
0.066
W -5
0.041
0.000
0.041
0.000
0.000
0.083
W -6
0.018
0.000
0.000
0.000
0.000
0.018
W -7
0.000
0.051
0.001
0.000
0.000
0.052
W -8
0.000
0.065
0.000
0.000
0.000
0.065
W -9
0.028
0.000
0.000
0.000
0.000
0.028
W -10
0.000
0.000
1 0.040
0.000
1 0.000
0.040
W -11
0.000
0.123
0.000
0.000
0.000
0.123
W -12
0,038
0.015
0.000
0.000
0.000
0.054
W -13
11.063
0.000
0.000
0.000
0.000
0.063
W -14
0.037
0.020
0.004
0.000
0.000
0.061
Subtotal
0.349
1 0388
0.087
1 0.000
0.000
0.824
Southern District
S -1
0.039
0.000
0.000
0.000
0.000
OA39
S -2
0.320
0.000
0.000
O. Dot)
0.000
0.320
S -3
0.382
0.000
0.000
O.D00
0.000
0.382
S-4
0.051
0.091
0.000
0.000
0.000
0.142
S -5
0.034
0.089
0.000
0.000
0.000
0.122
S -6
0.019
0.089
0.000
0.000
0.000
0.108
Subtotal
0.845
0.268
0.000
0.000
0.000
1.113
Totals 1 1.539 1 0.993 1 0.471 1 0.000 1 0.000 3.003
Appendix B i i- I
APPENDIX C - DESIGN FLOWS FOR THE TRUNK SEWER SYSTEM
Northern District
W1.1
N18.1
W- Trunk
Average
Cumulative
Peak
Peak
.5
From
To
Subdistrict
Flow
Average
Flow
Waste
DESIGN
Point
Point
Added
Added
Flow
Factor
Flow
FLOW
N17.1
N16.1
DIGD
NIGD )
(PFF)
(bIGD
MGD
Northern District
W1.1
N18.1
W- Trunk
5 8
0.758
3.3
2.n
.5
N18.1
N17.2
N -1 +N -19
0.005
0.763
3.3
2.52
2.52
17.2
N17.1
-17
.020
0.783
3.3
2.58
2.58
N17.1
N16.1
0. 00
0.783
3.3
2.58
2.58
16.1
N8.4
N -1
0.037
0. 2I
3.2
T - 6
2.
.4
N8.3
.000
0. 21
4
3. 8
3.28
N8.
N 2
I
- O - T4 -
3.2
-- T - 67 -
2.
N8.2
N8.1
0. 00
0.842
3.2
2.6
- 2 - .6'9 --
9
N8.1
N4.3
0. DO
0.842
3.2
2.69
N4.3
N4.2 I
Junctio
n
.151
0. 92
3.2
3.18
3.18
N4. 2
N4.1
N4
0.001
0.993
3.2
118
3.18
94.1
N3.6
Junction
I. 3
2.627
2.7
7.09
7.
N3.6
N15
N -3
0.056
2.682
2.7
7.24
7.24
3.5
N3.4
unction
- Toms
2.730
.7
7.37
7.37
N3.4
N3.
0. 0
2.730
2.7
7.37
7. 7
N3.3
N12
0.000
2.730
2.7
7.37
7. 7
N .2
3.1
0.
.730
2.7
7.37
7.37
N .I
2.2
2.730
.7
7.37
.37
N2.2
N2.1
N -2
0132
1962
2.6
7.70
7.70
N5.3
N5.2
0.000
0.048
4
19
0.19
N52
N5.1
0.000
0.048
4
0.17
0.1
N5.1
N3.9
- TO - O0
48
4
0 - - 19
.1
N3.9
N .8
.048
4
.1
3.8
N .7
.0 0
0.04
4
.19
0.1
N3.7
N3.5
0.000
0.048
4
0.19
0.19
. 4
4
7
0.17
14.
14.5
. 4
4
0.17
0.17
.5
14.4
-l4
4
- F29 -
0.28
14.4
N 14.3
0.000
4
.2
0.
14.
0
0.070
4
0.28
0.28
l4.
94.1
-1
0.035
.1 5
4
.42
0.42
N14.1
N9.4
N- 12 +N -15
+S -I
0.061
0.166
3.9
0.65
0.65
N9.4
N9.3
N-
.OS
02 5
0. 5
- OT
N .3
N9.2
0.00
0:125
3.
0.85
5
N
.2-
N9.1
.0
72
3.
- 0 - T5
- UT 5
- 7.71 -
N
.I
N11.
-1
14
3
. I
1,111.3
N11.2
0.000
0,239
3.8
0.91
0.91
NI
1.2
N11.1
1
0.239
3.8
0.91
.91
N11.1
N4.1
Junction
1.633
2.9
4.74
4.74
Mn
NI1.5
N1 L4
1.140
3.1
3.53
3.53
N11.4
NILI
N -11
P0.2
1.394
3
4.18
4.18
N7.1
N6.5
+STLWTR?
0.048
4
0.19
-- 0 - 131 -
0.19
.5
-- N .4
0.04
4
.1
.4
N .
48
4
.I
.1
N6.3
N6.2
U.U48
4
0.19
0.1
N6.2
N .I
.10
0.151
3.
.59
.59
N.I
N4.5
0.00
0.151
.5
0.5
N4.5
1
0.000
7151
3.9
0.5
0.5
N4.4
I N4.3
1 0.000
0.151
3.9
0.59
0.59
Appendix C C -1
APPENDIX C - DESIGN FLOWS FOR THE TRUNK SEWER SYSTEM
Western District
W11.2
W'II.I
Average
Cumulative
Peak
Peak
0.48
From To
Subdistrict
Flow'
Average
Flow
Waste
I DESIGN
Point Point
Added
Added
Flow
Factor
Flow
FLOW
3.6
1.08
NIGD
NIGD )
(PFF)
(MGD)
(MGD
Western District
W11.2
W'II.I
W -11
0.123
0.123
3.9
0.48
0.48
W1L1
WILLS
W -14
Junction
0.178
0.301
16
1.08
Log
WILLS
W8.2
0.80
0.000
0.301
3.6
1.08
1.08
W8.2
W8.1
S -3
0.000
0.301
3.6
1.08
1.08
W8.1
W7.2
W -8
0.065
0.366
3.6
1.32
1.32
W7.2
W7.1
W -7
0.052
0.418
3.5
1.46
1.46
W7.1
W7LS
Junction
0.169
0.587
3.4
2.00
2.00
W7LS
W2.2
0.000
0.587
3.4
2.00
2.00
W'2.2
W2.1
W -2 +W -3
0.125
0.711
3.3
2.35
2.35
W2.1
W1.2
0.000
0.711
3.3
2.35
2.35
W I.2
WI-1
%V -1
0.047
0.758
3.3
2.50
2.50
5.
W7.3
W7.1
W -6 +W -9 +W 10
0.086
0.169
19
0.66
0.66
6
5
W'12.1
WILL
W -12
0.054
0.117
4
0.47
1 0.47
L
I
I I
I
I
Southern District
W4.1
S2.2
W -4
0.066
0.066
4
0.26
0.26
S2.2
S2.1
S -2
0.320
0.386
3.6
1.39
1.39
S2.1
S3.2
0.80
0.000
0.386
3.6
1.39
1.39
S3.2
S3.1
S -3
0.382
0.769
3.3
2.54
2.54
S3.1
S6.2
4.20
0.000
0.769
3.3
2.54
2.54
S6.2
S6.1
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0.876
3.2
2.80
2.80
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1.140
3.1
3.53
3.53
55.1
S6.1
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0.122
0.264
3.7
0.98
0.98
PEAK FLOW FACTOR TABLE
Total Avg.
Flow (MGD)
PFF
0.00
4.00
0.12
3.90
0.19
3.80
0.24
3.70
0.30
3.60
0.40
3.50
0.50
3.40
0.65
3.30
0.80
3.20
1.00
3.10
1.20
3.00
1.50
2.90
L90
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2.30
2.70
2.90
2.60
3.50
2.50
4.20
2.40
5.10
2.30
6.40
2.20
8.00
2.10
10.40
2.00
13.50
1.90
18.00
1.80
30.00
1.70
Appendix C C -2
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APPENDIX F - LIFT STATION COST ESTIMATES
Northern District
N -20LS 0.17 115 6 7.5 $60,000
Duplex Subm.
Western District
Design
Design
Estimated
Construction
Point
Flow
Flow
Size
Pump Size
Cost
MGD
m
in.
(HP)
$)
Northern District
N -20LS 0.17 115 6 7.5 $60,000
Duplex Subm.
Western District
TOTAL ESTIMATED LIFT STATION CONST. COST 5320,000
CONTINGENCIES, DESIGN, ADMIN., INTEREST (35 %) $112,000
TOTAL LIFT STATION COST $432,000
Appendix F F -1
W-4LS
0.26
183
6
$80,000
Duplex Subm.
W -7LS
2.00
1386
10
$60,000
Duplex Subm.
W -11LS
1.08
752
6
$45,000
Duplex Subm.
W -13LS
0.25
175
4
$75,000
Duplex Subm.
TOTAL ESTIMATED LIFT STATION CONST. COST 5320,000
CONTINGENCIES, DESIGN, ADMIN., INTEREST (35 %) $112,000
TOTAL LIFT STATION COST $432,000
Appendix F F -1
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