HomeMy WebLinkAboutSEWER MASTER PLAN - 18-00305 - Approx. 1000 Yellowstone Hwy - Thomson Farms - The Grove Final Plat Phase 1
February 9, 2018
Prepared For:
Rexburg Development
160 West Canyon Estate Drive
Alpine, Utah 84004
Thomson Farms Sanitary Sewer Master Plan
Thomson Farms Sanitary Sewer Master Plan
Page 1
Table of Contents
1.0 INTRODUCTION ......................................................................................................... 2
2.0 EXISTING SANITARY SEWER SYSTEM ........................................................................ 2
3.0 PROPOSED SANITARY SEWER SYSTEM ..................................................................... 2
3.1 Design Criteria ............................................................................................................................... 2
3.1.1 Sanitary Sewer System Flows ............................................................................................... 2
4.0 APPENDIX A – DATA AND RESOURCES .................................................................... 4
Thomson Farms Sanitary Sewer Master Plan
Page 2
1.0 INTRODUCTION
The sanitary sewer master plan was prepared to determine sanitary sewer flows and collection line sizes for
the Thomson Farms development located in Rexburg, Idaho. The project site consists of approximately 60.33-
acres located west at approximately 472 North Yellowstone Highway, about 2.4 miles northeast from BYU
Idaho’s campus in Rexburg, Idaho. Planned uses for the proposed development include apartments,
townhomes, single family homes, and Retail/Restaurant space.
2.0 EXISTING SANITARY SEWER SYSTEM
Sewer service in this area is provided by Rexburg City. The proposed site does not currently have existing
sewer service although there is existing sewer infrastructure running in the Yellowstone Highway to the west
and Stegelmeir Lane to the north. Available capacity in the existing sewer mains will need to be confirmed
by Rexburg City.
3.0 PROPOSED SANITARY SEWER SYSTEM
The proposed Thomson Farms Development will have connection to sewer lines, in both the Yellowstone
Highway and Stegelmeir Lane. Connection point 1 which occurs at proposed sewer manhole #107 will serve
the Restaurant/Retail area. Connection point 2 which occurs at proposed sewer manhole #112 collects sewer
from the majority of the residential development including all single-family lots, the southern half of the
townhomes, and all but three of the apartment buildings. There are two additional connection points, 3
(#105) which collects the northern three apartment buildings, and 4 which collects the remaining townhomes.
Connection point 4 includes sewer discharges that enter the system at sewer manhole #140 and #106.
3.1 Design Criteria
3.1.1 Sanitary Sewer System Flow s
Evaluation of properties upstream of the Thomson Farms site was outside the scope of this report and has not
been addressed. Efforts were made to stub the sewer system to the limits of the Thomson Farms property as
deep as possible to allow for future connection.
Sanitary sewer flow calculations for the project have been completed in accordance with Idaho Administrative
Code IDAPA 58.01.03. Average annual daily flow (AADF) rates and maximum daily flow (MDF) rates have
been calculated for the connection points described above.
Overall units, square footages, and uses are based on the concept plan dated January 16, 2018.
Apartments, Townhomes, Single-Family, Retail/Restaurant, Grocery, and shopping areas have been equated
to Equivalent Dwelling Units (EDU’s) as follows:
• 300 Apartment Units + Clubhouse (assumes clubhouse is equivalent to 2 EDU’s) – 302 unit’s x 250gpd,
Total AADF=75,500gpd; 302 EDU’s
• 120 Townhomes + Clubhouse (assumes clubhouse is equivalent to 1 EDU) – 121 EDU’s x 250gpd =
Total AADF=30,250gpd; 121 EDU’s
• Single Family Units – 27 – 27 Units x 300gpd (assume 4 bedrooms), Total AADF=8,250gpd; 33
EDU’s
• Retail/Restaurant – 40,000s.f., 35gpd/seat, 400 seats, 14,000gpd; 56 EDU’s
• Grocery – 40,000s.f., 130gpd/1,000s.f., Total AADF=5,250gpd; 21 EDU’s
Thomson Farms Sanitary Sewer Master Plan
Page 3
• Shopping – 30,000s.f. (500 stalls), 4gpd/stall, Total AADF=2,000gpd; 8 EDU’s
AADF calculations have been made based on EDU totals generated from the calculations described above.
The AADF provides the basis for collection system sizing associated with sanitary sewer. The total AADF for
the project is calculated to be 135,250gpd. Since this total will be divided over multiple connection points to
the existing system we have broken them down as follows:
Connection Point 1 = 85 EDU’s; 21,250gpd
o Retail/Restaurant – 40,000s.f. = 56 EDU’s
o Grocery – 40,000s.f. = 21 EDU’s
o Shopping – 30,000s.f. = 8 EDU’s
Connection Point 2 = 316 EDU’s; 79,000gpd
o Apartments – 222 Units = 222 EDU’s
o Townhomes – 61 Units = 61 EDU’s
o Single Family – 27 Units = 33 EDU’s
Connection Point 3 = 80 EDU’s; 20,000gpd
o Apartments – 80 Units = 80 EDU’s
Connection Point 4 = 60 EDU’s; 15,000gpd
o Townhomes – 60 Units = 60 EDU’s
Thomson Farms Sanitary Sewer Master Plan
Page 4
4.0 APPENDIX A – DATA AND RESOURCES
Figure 1 – Sanitary Sewer Calculations
Figure 2 – Overall Sewer Map
Connection
Point
Begin
Manhole
End
Manhole EDU's on Pipe Pipe
Material
Mannings
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Average Daily
Flow
(gal/EDU/day)
Peaking
Factor
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(gpm)
Diameter
(in)
Min
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(%)
K'Depth
(in)
Velocity
(ft/s)
Peak Flow @
Given Slope1
(gpm)
Percent Full
By Depth
(%)
Percent Full
By Flow
(%)
#1 111 107 85 PVC 0.013 250 4.00 59.0 8 0.70%0.060 1.94 2.01 488 24.3%12.1%
127 122 35 PVC 0.013 250 4.00 24.3 8 0.40%0.033 1.44 1.27 369 18.0%6.6%
124 122 9 PVC 0.013 250 4.00 6.3 8 0.40%0.008 0.74 0.85 369 9.3%1.7%
125 117 13 PVC 0.013 250 4.00 9.0 8 0.40%0.012 0.89 0.95 369 11.1%2.4%
122 117 48 PVC 0.013 250 4.00 33.3 10 0.28%0.030 1.71 1.20 560 17.1%6.0%
120 117 33 PVC 0.013 250 4.00 22.9 8 0.40%0.031 1.40 1.24 369 17.5%6.2%
117 113 94 PVC 0.013 250 4.00 65.3 12 0.22%0.040 2.39 1.32 807 19.9%8.1%
128 113 222 PVC 0.013 250 4.00 154.2 8 0.40%0.208 3.75 2.14 369 46.9%41.8%
113 112 316 PVC 0.013 250 4.00 219.4 12 0.22%0.136 4.44 1.86 807 37.0%27.2%
#3 136 105 80 PVC 0.013 250 4.00 55.6 8 0.40%0.075 2.18 1.61 369 27.2%15.0%
153 151 14 PVC 0.013 250 4.00 9.7 8 0.40%0.013 0.92 0.97 369 11.5%2.6%
150 144 29 PVC 0.013 250 4.00 20.1 8 0.40%0.027 1.31 1.20 369 16.4%5.5%
144 106 47 PVC 0.013 250 4.00 32.6 10 1.24%0.014 1.18 2.01 1,179 11.8%2.8%
142 140 13 PVC 0.013 250 4.00 9.0 10 1.24%0.004 0.64 1.37 1,179 6.4%0.8%
140 105 60 PVC 0.013 250 4.00 41.7 8 0.40%0.056 1.88 1.48 369 23.5%11.3%
Total 107 100 541 PVC 0.013 250 4.00 375.7 12 0.23%0.227 5.92 2.17 825 49.3%45.5%
#4
Thomson Farms Development
Sanitary Sewer Calculations
#2
Sewer Line Sizing.xlsx, SUMMARY 2/9/2018
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INSTALL 4' SSMH #116
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C-300
OVERALL UTILITY
PLAN
GWO
2/9/18
HORIZONTAL GRAPHIC SCALE
0
( IN FEET )
HORZ: 1 inch = ft.100
100 50 100 200
CHECKED BYDRAWN BY
PROJECT NUMBER
FOR:
PROJECT MANAGER
PRINT DATE
PHONE:
CONTACT:
TOOELE
169 N. Main Street, Unit 1
Tooele, UT. 84074
Phone: 435.843.3590
SALT LAKE CITY
Phone: 801.255.0529
LAYTON
Phone: 801.547.1100
CEDAR CITY
Phone: 435.865.1453
RICHFIELD
Phone: 435.896.2983
WWW.ENSIGNENG.COM
E N S I G N
THE STANDARD IN ENGINEERING
7835
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REXBURG DEVELOPMENT
160 W CANYON ESTATE DR
ALPINE, UT 84004
PAUL BRINGHURST
(385) 321-1403
JFK
JFK
2/9/18
DATE: 2/9/18
CALL BLUESTAKES
@ 811 AT LEAST 48 HOURS
PRIOR TO THE
COMMENCEMENT OF ANY
CONSTRUCTION.Know what's below.
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