HomeMy WebLinkAboutTract 6616 Sewer Study AddendumSEWER STUDY
Vesting Tentative Tract 6616
Objective
The objective of this study is as follows:
1) To purpose of this study is to determine the sewer discharge from Tract 6616.
Existing Facilities
The site is currently undeveloped and surrounded by undeveloped land on all sides.
McCutchen Road is on the north side of the tract boundary. Tracts 6859 and 6860 are
planned for the land to the south. Tract 6616 is a residential subdivision consisting of 281
lots. The sewer discharge will be collected via various 8-inch lines that will connect to the
main 10-inch and 8-inch lines at the various manholes identified in the sewer exhibit and
attached spreadsheet. The 10-inch sewer will connect to the 48-inch McCutchen trunk line at
an existing manhole. The McCutchen Trunk ultimately discharges to the Wastewater
Treatment Plant #3.
Planned Land Uses
Tract 6616 is a residential development and will consist of 281 single family dwellings, and a
drainage retention basin.
Phasing
The project will be constructed in eight phases. Phase 1 contains 32 single family homes.
Phase 2 contains 35 single family homes. Phase 3 contains 36 single family homes. Phase 4
contains 35 single family homes. Phase 5 contains 30 single family homes. Phase 6 contains
36 single family homes. Phase 7 contains 37 single family homes, and Phase 8 contains 38
single family homes.
Design
The proposed development will be serviced by the 48-inch trunk line located on the north
side of McCutchen Road. An 8-inch and a 10-inch sewer is being proposed for the collection
of sewage discharge from Tract.
Based on our calculations shown below and in the enclosed spreadsheet, Tract 6616 is
expected to generate 0.472 cfs of sewer.
Results
Tract 6616 has been divided into 8 phases and the sewer has been design to serve each phase
as it is constructed. It is calculated that the project will generate 0.472 cfs of sewer. The
system is designed to use both an 8-inch PVC pipe at 0.35% and a 10-inch PVC pipe at
0.25% as sewer mains. The last 100 feet of all reaches are 6-inch PVC pipes calculated at
1%. The 10-inch sewer discharges to the McCutchen trunk line via an existing manhole on
the north side of McCutchen Road. The McCutchen trunk line discharges to the Wastewater
Treatment Plan No 3.
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. 3 which currently has a capacity of
32.0 million gallons per day.
Blaine Neptune
R.C.E. 55102
SEWER STUDY
Tract 6616
Minimum Velocity Full:2
Maninings "n":0.011
Cumulat.PeakTotal Req'd.DesignCapacity
SERVICELandDEN.AREAE.D.U.AverageAve. Res.PeakFlowDesignU.S.U.S.ReachSizeSlopeSlopeD.S.D.S.at Design
AREAUseDU/ACacresFlow,cfsFlow,cfsFactorcfsFlow,cfsM.H.INV.lengthInchesINV.M.H.Slope, cfs
Initial Development
Pipe 14SF2 0.000805.4040.004 CO-14 336.32 1116 0.003507 0.010000 335.21 130.663
Pipe 13SF33 0.013274.0830.059 13 335.08 3208 0.002390 0.003500 333.96 120.845
Pipe 12SF33 0.013274.0830.113 12 333.96 3208 0.002390 0.003500 332.84 110.845
Pipe 11SF25 0.010054.1980.155 11 332.85 3108 0.002390 0.003500 331.76 100.845
Pipe 10SF5 0.002014.9310.165 10 331.66 1788 0.002390 0.003500 331.04 90.845
Pipe 9SF43 0.017293.9760.233 9 330.94 3308 0.002390 0.003500 329.78 80.845
Pipe 8SF32 0.012864.0960.286 8 329.68 1688 0.002390 0.003500 329.09 70.845
Pipe 7SF36 0.014474.0480.345 7 328.99 3008 0.002390 0.003500 327.94 60.845
Pipe 6SF35 0.014074.0590.402 6 327.94 3308 0.002390 0.003500 326.78 50.845
Pipe 5SF35 0.014074.0590.459 5 326.65 30010 0.001775 0.002500 325.90 41.295
Pipe 4SF7 0.002814.7680.472 4 325.80 23110 0.001775 0.002500 325.22 31.295
Pipe 3SF23 0.009250.0000.472 3 325.12 19710 0.001775 0.002500 324.63 21.295
Pipe 2SF0 0.000000.0000.472 2 324.53 15110 0.001775 0.002500 324.15 11.295
Pipe 1SF0 0.000000.0000.472 1 324.05 8710 0.001775 0.002500 323.83 EX1.295
Point of Confluence @ EXISTING MH 0.124210.472 1 324.05 8710 0.001775 0.002500 323.83 EX1.295
0.472 <<< Direct Flow into 48" McCutchen Trunk Line
P:\PROJECTS\13027.00-BOPT6616\Studies\Sewer\13027ss01 07-10-17.xls