WQ0040086_Application_20191107

PARKER & ASSOCIATES , INC .
ENGINEERS • SURVEYORS • PLANNERS
JACKSONVILLE , NORTH CAROLINA
LETTER OF TRANSMITTAL
TO: Mr. Monti Hassan DATE: November 7, 2019
NCDEQ -PERCS Unit REF: 6023 Richlands Hwy
1617 Mail Service Center WQ0040086
Raliegh,NC 27699 Sewer Application
WE ARE SENDING YOU:
One (1)Revised Plan Sheet(1 of 1); One (1)Revised Grinder Pump Station Calculation; One (1)Digital Copy of
the following: Plan Sheet(1 of 1), Grinder Pump Station Calcs, Bouyancy Calcs, and Technical Specifications.
DELIVERY VIA:
® Regular Mail ❑ Hand ❑ Federal Express
❑ UPS Overnight ❑ UPS Ground ❑ Other
THESE ARE TRANSMITTED AS CHECKED BELOW:
N For Approval ❑ As Requested ❑ For Review and Comment
❑ For Your Use ❑ For Bids Due
❑ Other
COMMENTS: The supply line for the Pump Station falls under rule 15A NCAC 02T, 0303 and
does not require a Permit.
. 447
Anthony G. Moctezuma
ec: Kiandra Anderson Staff Engineer
AGM/brs CF (P), LAM RECEIVED
(f enclosures are not as noted, kindly notify us at once)
secretary c2 2019 Forms 6023Richlandshwy LOT Hassan 6023RichlandsHwy Sewer Application 11 7 19 NOY 1 2 2019
NCDEQ/DWR/NPDES
306 New Bridge Street I P.O. Box 976 I Jacksonville, NC 28541-0976 I [phone]
Firm License Number F-0108 I www.parkerjacksonville.com

PARKER & ASSOCIATES , I N C .
ENGINEERS • SURVEYORS • PLANNERS
JACKSONVILLE , NORTH CAROLINA
[phone] I
APT&
306 New Bridge Street I P.O. Box 976
Jacksonville, NC 28541-0976
Firm License Number F-0108
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INDIVIDUAL GRINDER PUMP STATION CALCULATIONS
May 2019
Revised July 2019
Revised October 2019
1. DESIGN FLOW:
1 Single Family Residence = 360 GPD AVG
A 9 to 15 GPM progressive cavity pump with 1.5 inch service line to
tie into an existing 12"force main located on Richlands Hwy.
2. SYSTEM DATA: Service Line
SPS Influent Invert Elevation 48.0 Feet BECEIVED
Force Main Tie-in Point Elevation 48.0 Feet
Wetwell Diameter 4.0 Feet NOV 1 2 2019
Float Settings NCDEQIDWRINPDES
Pump Off Elevation 44.17 Feet
Lead Pump On Elevation 45.17 Feet
Alarm Elevation 48.0 Feet
Civil Engineering I Stormwater and Environmental Consulting
Feasibility and Development Planning I Land Surveying and Mapping I Subdivision and Construction Plans

Page 2 of 3
3. 24 HOUR STORAGE VOLUME.
Required Volume for 24 hr. Storage = 360 Gallons
Volume Provided = 7r(r)2 x Height ft x7.48 f 11
t
= 7r(2ft)2 x (51 —44.17) x 7.48 f 1
t
= 642 gallons
4. CYCLE TIME:
Wetwell Storage Volume (Vs) _ 7r(r)2 x Height ft x7.48 f 11
t
Vs = rr(2ft)2x1.0ftx7.48f1
t
Vs = 94 gallons
Pump Cycle Time (T) mins
T — Vs _ T — 94 gal
Qavg 0 .25 gpm
Qavg 1— 0 .25 gpm 1 —
Qrate ` 13 .96 gpm
T = 6.4hrs (Pump operates 3-4 times a day)

Page 3 of 3
5. TOTAL DYNAMIC HEAD (TDH):
The system was modeled using information provided by ONWASA along with calculations
hydraulic base model provided by Crystal Coast Engineering. The addition of approximately
12 GPM from this individual grinder pump station demonstrates very little impact to the overall
system. The progressive cavity pump as manufactured by Flygt has a very wide pumping range
that can meet the demands of this system. See attached Hydraulic model for additional
information regarding pumping conditions.
Total Dynamic Head as predicted by the Hydraulic model
USE TDH of = 81.43ft
PUMP SELECTION
System requirements 12.24 GPM @ 81.43 ft TDH
Use: Single Flygt MF3068.175, 1.7 hp, 8.1 amps 230 volt
single phase, progressive cavity grinder pump
C2 2019.Forms 6023RichlandsHwy.SewageCalcs.Hussan.6023RichlandsHwy SPSCalculations.revised.10.15.19