REVIEWED ENG RESUB4 BLD2022-0439+SEWAGE PUMP INFO+6.5.2023_11.21.31_AM+3587492RESUB
Jun 05 2023
CITY OF EDMONDS
DEVELOPMENT SERVICES
DEPARTMENT
May 31, 2023
City of Edmonds, Development Review — Public Works
ATTN: Public Works Director
7110 210th St SW
Edmonds, WA, 98026
Re: MEADOWVIEW LOT 4 — ANGLE RESIDENCE
E/ONE GRINDER PUMP CALCUATIONS
LDC# 21-164
EXECUTIVE SUMMARY
Surveying
LDC1 Engineering
Planning
BLD2022-0439
REVIEWED BY SENIOR
UTILITIES ENGINEER MIKE
DELILLA
The following summary and design calculations are in accordance with the City of Edmonds
design standards for a residential sewage pump for the Meadowview Estates, Lot 4 project.
The project proposes to build a single-family home and will necessitate the installation of a
residential sewage pump and associated force main to sewer out the residence. The pump
unit will be an E/One DH151 simplex grinder pump which has been designed in accordance
with the City of Edmonds standards. Please see Appendix A for all calculations for head
pressure and buoyancy.
EXISTING CONDITIONS
Lot 4 of Meadowview Estates is approximately 24.36 vertical feet below the connection point
to the gravity system installed near the driveway along 72nd Ave W. The site contains
moderate slopes with steep slopes located along the westerly property line.
A. PUMP SELECTION
A E/One DH151 grinder pump has been specified for the proposed residence. Per the
manufacturer, this pump is rated for flows up to 1,500 gallons per day (GPD) with a discharge
capacity of 15 gallons per minute at 0 pgis. For a single-family residence, E/One assumes a
daily flow of 200-300 GPD for a single-family home and for these calculations, a value of 300
GPD was used for sizing.
B. HEAD PRESSURE CALCULATIONS
Total Dynamic Head (TDH) has been calculated based upon actual site conditions and takes
into account the construction of 1.5" force main pipe on the lot. Minor loss calculations are
summarized in Appendix A. A summary of the TDH calculation is below:
Service ABOVE t it e Standard ph: 425.806.1869 • fx: 425.482.2893 • www.LDCcorp.com
Meadowview Lot 4- Angle Residence
May 31, 2023
Page 2 of 10
Total Dvnamic Head Calculations:
Elevation head = 24.36 ft
Force main pipe losses = 2.77 ft (LF 1.5" PVC, C = 150)
Force main minor losses = 0.21 ft*
TDH: = 27.34 ft
*A summary of pipe bend and valve counts can be in Appendix A (Page A-4)
C. BOUYANCY CALCULATIONS
Station Weight has been calculated from standard specifications given by E/One for the
DH151 unit and associated rails, fixtures, piping and pump. Full calculations for the following
can be found in Appendix A. A summary of these calculations can be found below:
Basin Dimensions/Data
Allowable Bearing Pressure (Soil) = 2500 lb/ft3*
Basin/Unit Volume = 52.84 ft3
Displaced Weight of Water = 3956.5 lbs
Safety Factor = 20%**
Assumed Station Weight = 900 lbs
*As given by Geotechnical Report associated with Meadowview Estates Plat
**As Required by the City of Edmonds
Ballast Reauired
Assumed Unit Weight of Concrete =
145 lb/ft3
Required Concrete/Ballast Weight =
3956.5 lbs
Required Concrete Volume =
21.08 ft3
Provided Concrete Volume =
21.68 ft3
Concrete Ring Width =
1.00 ft
Concrete Ring Height =
2.30 ft
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Service ABOVE the Standard
Meadowview Lot 4- Angle Residence
May 31, 2023
Page 3 of 10
Please see the calculations and materials/equipment speciation's and designs included in
Appendix A and within the plans comprise the details and requirements from City of Edmonds.
Should you require additional information, please contact us.
Sincerely,
LDC, Inc.
1.
Sang Park, PE
Project Manager
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Service \LOVE the Standard
Meadowview Lot 4- Angle Residence
May 31, 2023
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Appendix A
Calculations
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Service ABOVE the Standard
Meadowview Lot 4- Angle Residence
May 31, 2023
Page 5 of 10
Total Dynamic Head Calculations
Total Dynamic Head Calculations:
Discharge Pipe: 5 Linear Feet
roughness, c = 150 Material: PVC
diameter, d = 4 inches
flow, q (gpm) = 15 (pumping capacity)
f= 0.2083 X (100/c)^1.85 X q ^1.85
f= 0.017 feet/100 ft of pipe Velocity, v = 0.4 fps
Velocity out of range!
Total Friction Loss = 0.00 feet (3 to 6 fps is an acceptable range)
Minor Losses in Discharge Pipe:
HL= KxV^2
2g
Number of 90 deg. bends = 0
Number of 45 deg. bends = 0
Number of 22.5 deg. bends = 0
Number of Swing CVs = 0
Number of Gate Valves = 0
where ; K= 0.9 for 90 deg. bends
K= 0.5 for 45 deg. bends
K= 0.3 for 22.5 deg. bends
K= 2.5 for Swing Check Valve, open full
K= 0.2 for Gate Valve, open full
Total Minor Losses = 0.0 feet
Force Main: 135 Linear Feet
roughness, c = 150 Material: PVC
diameter, d = 1.5 inches
flow, q (gpm) = 15 (pumping capacity)
f= 0.2083 X (100/c)^1.85 X q ^1.85
dA4.8655
f= 2.05 feet/100 ft of pipe Velocity, v = 2.7 fps
Okay.
Total Friction Loss = 2.8 feet (3.0 to 6 fps is an acceptable range)
Minor Losses in Force Main:
HL = K x V^2 where ; K= 0.9 for 90 deg. bends
2g K= 0.5 for 45 deg. bends
K= 0.3 for 22.5 deg. bends
Number of 90 deg. bends = 0 K= 2.5 for Swing Check Valve, open full
Number of 45 deg. bends = 0 K= 0.2 for Gate Valve, open full
Number of 22.5 deg. bends = 6
Number of Swing CVs = 0 See Minor Losses Tab for Data Entry
Number of Gate Valves = 0
Total Minor Losses = 0.2 feet
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Service ABOVE the Standard
Meadowview Lot 4- Angle Residence
May 31, 2023
Page 6 of 10
SUMMARY OF HEAD LOSSES:
Force Main Friction Loss =
2.77
Force Main Minor Losses =
0.21
Discharge Pipe Friction Loss =
0.00
Discharge Pipe Minor Losses =
0.00
Elevation Head =
24.36 feet
Total Dynamic Head, TDH 1 27.34 Ifeet
Service ABOVE the Standard
Meadowview Lot 4- Angle Residence
May 31, 2023
Page 7 of 10
Buoyancy Calculations
Hydrostatic Uplift - Ballast Estimate
There is no evidence from geotechnical investigation, of any possibility that ground water could interact
with any portion of the proposed residential lift stations specified for this project.
Min Soil Allowable Soil Bearing Pressure /Design Soil Bearing Pressure =
Min Req. Soil Bearing = 687.05 Ib/ft2
Volume of proposed lift Reservoir= Vol =
Unit Diam=
Unit Circumferance =
Unit Cross Sectional Area= Area =
Unit Depth =
20% FOS Displaced Water Mass =
Weight of Proposed Reservoir and system =
145
Unit Mass Deficit =
52.84 ft3
3 ft
9.42 ft
7.07 ft2
7.475 ft
2500 I b/ft2
Soil Bearing is Sufficient
686.7129 lb
9576.826 lb
3956.5 Lb& (with factor of safety)
900.0 Ibs
3056.5 Ibs
o
b/ft3 Req. Concrete Volume = 21.08 tt
Proposed Concrete Base Ring Width = 1.00 ft (Min) Concrete Ring around
Proposed Concrete Base Ring Height = 2.30 ft Base of Reservoir
OR
Balast Slab to which Reservoir is bolted = 3.00 ft Conc. Slab Under Unit
Proposed Concrete Volume = 21.68 ft3 RING
OR
Proposed Concrete Volume = 21.21 ft3 BASE
Proposed Unit Installation Must provide total Installed Mass of: 1 3956.48 Ilbs at minimum
or resistance for same force by other method.
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Service ABOVE the Standard
Meadowview Lot 4- Angle Residence
May 31, 2023
Page 8 of 10
Performance Curve
PRESSURE SYSTEM DESIGN PRE_SSLRE
611k
01
,
ESD 08-0022 REV. Z 6/08
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Service ABOVE the Standard
Meadowview Lot 4- Angle Residence
May 31, 2023
Page 9 of 10
Appendix 6
Details
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Service ABOVE the Standard
Meadowview Lot 4- Angle Residence
May 31, 2023
Page 10 of 10
E/One DH151 Detail w/ Elevations
OPTIONS :Ox DH 151 LEVEL CONT OLS)
FIELD JOINT REQUIRED DR 1 S 1 LE,`�NT aLs,
FOR MOOELS
OH151-129 / DRI5I-129
t
OHISI-I60 / DRISI-160 GASKETED LID. HOPE
STRAIN RELIEF CORD
CONNECTOR
POWR/ALARM CABLE
6 CONDUCTOR W/GND` E/CIPE EQUALIZER
FINISHED GROUND + - 232.23
DUAL WALL. CORRVOATED
HOPE ACCESSWAY
OUICK pI$CONNECT ASSY.
INTERNAL WELL VENT
2.0' DIAMETER
(30, S.S.)
S.S. CAST BALL VALVE
DISCHARGE
INLET GROMMET
EL= 227 00 1 1/4' FPT
TO ACCEPT 4.50' 0. .
PVC PPE [STANDARB .
T DUST COVER SUPPL D
FOR SHPMENT (NOT
SUTABLE FOR BURIAL EL- 226.54
1 1/4' DISCHARGE LINE
(304 SS.)
43.9 In
1115 mm
ALARM EL= 225.76
CK VALVE
NORYL)
38.4 in
975 mm
975
VALVE
I
ON EL= 225.09 737�
6NNORYL
I mm
OFF EL= 224.76 116 gal
439 L
21 In
17 In 534 mm
432 mm 84 gal
318 L
.,\ 50 od
l
E L = 223.34
POLYETHYLENE TANK
1/2' NOMINAL WALL THICKNESS
0 38.8 in
150 GALLON CAPACITY
984 m—
SEU•Po51TIVE CISPI-ACEMENT TYPE PUMP
fMRFCTI Y r"VFN BY A 1 HP MOTOR CIR
CONCRETE BALLAST MAY BE REQUIRED
SEE INSTALLATION INSTRUCTIONS
FOR DETAILS
NOTE: DIMENSIONS ARE FOR REFERENCE ONL
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Service ABOVE the Standard