HomeMy WebLinkAboutTract 6352 Sewer StudySEWER STUDY
FOR
TRACT NO. 6352
PHASE 1 TO 10
City of Bakersfield
Project # 06159.02
May 2017
Prepared for:
Tarina Homes, Inc.
1401 19th Street #215
Bakersfield, CA 93301
Contact: Chris Johnston
661-322-2030
Prepared By:
John Northrop, EIT
Checked By:
Blaine S. Neptune
R.C.E. 55102
Prepared By:
2001 Wheelan Court
Bakersfield, CA 93309
SEWER STUDY
Tract No. 6352
Objective
The objective of this study is as follows:
• To determine the total sewer discharge from Tract 6352 (Phases 1-10)
• To provide a sewer system in accordance with the City of Bakersfield requirements and
guidelines.
• To provide an economical and reasonable design for sewer conveyance.
Existing Facilities
Tract 6352, Phases 1 through 10, is located within section 20, T29S, R29E M.D.M., bounded
by SR-178 to the north, Kern Canyon Road (SR-184) to the south, Future Vineland Road to
the west and Bedford Greens Drive to the east within the City of Bakersfield. Two hundred
sixty-four lots of Tract 6352 will discharge to an existing 21-inch sewer line located just east
of the existing Breckenridge Drainage Channel, and ultimately to the City of Bakersfield’s
Wastewater Treatment Plant #2.
Planned Land Uses
Tract 6352, Phase 1 through 10, is a low density residential development that will consist of
264 single family dwellings.
Phasing
The project analyzed in this report consists of ten phases and a total of 264 single family
dwelling units as summarized below.
Tract 6352: Lot Breakdown per Phase
Phase
No.
Ph. 1 Ph. 2 Ph. 3 Ph. 4 Ph. 5 Ph. 6 Ph. 7 Ph. 8 Ph. 9 Ph. 10
No. of
Lots
32 15 23 23 23 35 27 23 29 34
The developer of Tract 6352 has been conditioned to install an 18” sewer main along
Vineland Road from the northern Tract Boundary near SR-178 to SR-184 and along SR-184
to connect to the existing 21-inch sewer located east of the Breckenridge drainage channel.
This proposed 18” sewer main is Pipe No. 176 of the Northeast Bakersfield Sewer Study
prepared By Meyer Civil Engineering, Inc. approved September 2005. The proposed 18”
sewer main has a capacity of 5.21 cfs and will be utilized by Phase 10 of Tract 6352 and
future northwesterly development. See the aforementioned Northeast Bakersfield Sewer
Study to see the proposed areas to be service by the 18” sewer main.
Design
Tract 6352, Phase 1 to 10, will be serviced by an existing 24” sewer located on the east side
of the existing Breckenridge Drainage Channel, just south of SR-178 and east of Bedford
Greens Drive. The proposed development will utilize two points of connection with the
existing 24” sewer main. One of the connection points will discharge Phases 1 through 7 &
the second connection point will discharge Phase 8 through 10.
Phases 1-7 are expected to generate a total flow of 0.282 cfs of sewage, and Phases 8-10 are
expected to generate a total flow of 0.149 cfs of sewage. Therefore, the total sewer discharge
produced by Tract 6352 is 0.431 cfs. Although grades have not been established for the
sewer system in Phases 8-10, the pipes have been modeled at the city’s minimum slope of
0.35%. Our calculations, shown below and in the enclosed spreadsheet, show that the
proposed 8” sewer line will be more then capable of servicing the proposed project.
V = 1.486 R2/3S1/2 and Q = AV
n
Where “V” is the average velocity in feet per second
“n” is Manning’s coefficient
“A” is the area based on the pipe size
For plastic pipe: n = 0.011
1.486 = 135.091
n
“R” is the hydraulic radius in feet and “S” is the slope in feet per foot.
Sewer Main Allowable Flow Characteristics
6” @ 0.50% V = 135.091 x 0.25 x 0.0707 = 2.388 fps
A = 0.196 sf
Q = 0.486 cfs
Sewer Main Allowable Flow Characteristics
6” @ 1.00% V = 135.091 x 0.25 x 0.10 = 2.415 fps
A = 0.196 sf
Q = 0.663 cfs
Sewer Main Allowable Flow Characteristics
8” @ 0.35% V = 135.091 x 0.303 x 0.059 = 2.415 fps
A = 0.349 sf
Q = 0.84 cfs
Sewer Main Allowable Flow Characteristics
8” @ 4.00% V = 135.091 x 0.303 x 0.20 = 8.19 fps
A = 0.349 sf
Q = 2.86 cfs
Calculations are attached in spreadsheet form.
Results
Tract 6352 Phase 1 through 10 is a multi-phase, low density residential development that will
be serviced by an existing 24” Sewer Main maintained by the City of Bakersfield. It is
calculated that the entire project will generate 0.431 cfs of sewage. Due to the existing
Topography and the mountainous terrain in the project area, the system is designed to use 8”
PVC pipe at slopes that coincide with the proposed street slopes while maintaining a
minimum of 5 feet of cover. At a minimum, the last 100 feet of all reaches are 6” PVC at
1.0% per the City of Bakersfield Design Standards. The proposed project discharges to an
existing 24” sewer main through two separate proposed manholes located just east of
Bedford Greens Drive. The existing 24” sewer main will ultimately discharge Tract 6352 to
the City of Bakersfield’s Wastewater Treatment Plan No 2. The existing Plant operates daily
at approx. 13-15 million gallons per day with an ultimate capacity of 25 million gallons per
day. The proposed project will discharge an additional 0.232 million gallons per day to Plant
No. 2 for treatment.
C.E.Q.A. Compliance
Development of the proposed project will not result in significant impacts to the existing and
proposed sewer collection and treatment facilities. The development will be serviced by the
City of Bakersfield’s Wastewater Treatment Plant No. 2 which currently has a capacity of
25.0 million gallons per day.
Blaine Neptune
R.C.E. 55102
Vicinity Map
TRACT
6352
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