WQ0002648_Correspondence_20190521

Seagrove -Utah Metropolitan
Water District of Randolph Counter
Post Office Box 370, Seagrove, North Carolina 27341
Phone: [phone]
May 17, 2019
Ms. Tessa R. Monday
NCDEQ Non -Discharge Branch
Office 9424, Archdale Building
512 N. Salisbury St, Raleigh, N.C. 27604
Raleigh, N.C. 27699-1617
RE: Waste Water Treatment Facility WQ0002648
Seagrove -Utah Metropolitan Water District of Randolph County
Review of Treatment Capacity
Dear Tessa R. Monday,
RECEIVEDINCOECICWR
10AY 2 1 2019
Non -Discharge
Permitting Unit
Enclosed is the Assesment of Treatment Capacity of Seagrove -Utah Metropolitan District provided by LKC
Engineering. We agree with their findings and are proceeding to explore avenues to correct the findings.
Seagrove Ulah Metropolitan Water District
Mic ael T. Walker
Secretary
336-465-1460

April 30, 2019
Mr. Mike Walker
Seagrove -Utah Metropolitan Water District
6943 US Hwy 220 South
Asheboro, NC 27205
Re: Wastewater Treatment Facility WQ0002648
Seagrove -Utah Metropolitan Water District, Randolph County, North Carolina
Review of Treatment Capacity
Dear Mike:
Per our previous discussions, LKC Engineering has reviewed the existing treatment process for the above
referenced system. Our review was completed to address the comments for submittal to NCDEQ in
support of your current permit. We reviewed the treatment capacity of each package treatment system
in use at the facility and the treatment capability of the process.
The central focus of the review was to complete an analysis of the package treatment units (30,000 GPD
unit 1 and 60,000 GPD unit 2) working in tandem to treat the domestic waste stream from the water
district customers. We completed this by executing a mathematical model representation of the
existing treatment process to calculate its theoretical capacity. To simulate the seasonal variance of the
plant, the model was executed at the maximum and minimum temperatures that are expected at 45
and 82 degree with a corresponding air temp of 35- and 90-degrees F all while flowing at 90,000 gpd. A
summary report of the plant simulation is attached along with a composite sample of the influent taken
3-12-2019
To further summarize, the 2 package units are capable of treating a domestic wastewater flow of 90,000
gpd (60,000 gpd and 30,000 gpd) to 02T standards for land application. Where the system falls short is
1) that the chlorine contactor appears to have been designed for the 30,000 gpd train and cannot
disinfect the 90,000 gpd flow on anything but the hottest time of year. And 2) it is dangerous to
equipment and reliability to operate a WWTP without adequate screening.
In summary, our review does show that the system meets the capacity of 90,000 gpd. However, it is our
recommendation that you should install proper influent screening, and add volume to the current
chlorine contact chamber. Our recommendation is to install a bar screen at the influent box or at an
upstream manhole , and expand the contact chamber to a minimum 4200 gallons or explore installing
UV disinfection. Our office can assist in providing design and permitting assistance for this work. Since
we have the model calculations of your plant completed we could attack permitting calculations in short
order.
LKC Engineering, PLLC, 140 Aqua Shed Court, Aberdeen, North Carolina 28315
PH: 910/420-1437 * FAX: [phone] * License No. P-1095

Page 2
Mike Walker
April 30, 2019
Upon your review and concurrence with the enclosed information, please forward these results and
recommendations to the following contact:
Ms. Tessa R. Monday
NCDEQ Non -Discharge Branch
Office 942Y, Archdale Building
512 N Salisbury Street, Raleigh NC 27604
1617 Mail Service Center
Raleigh, NC 27699-1617
If you should have any questions regarding this information, or if you wish to discuss further, please do
not hesitate to contact this office.
Sincerely,
LKC Engineering, PLLC
.....................................................
Bill Lester, Jr., P.E.
Enclosures

Model Results of Simulation of Seagrove — Ulah WWTP
Figure I ProcessDiagrwn Seagrave-Ulalr WTVTP 07ow:s, GPD)
Model
The modeling software used was Hydromantis GPS-X version 7.0. The model is a material balance -based
calculation where all materials entering or existing the plant are accounted for at every time step of the
simulation. The simulation partitions a wastewater treatment process into all of the subunits of a plant and
accounts for the flow of many species of bacteria, all wastewater components, produces of respiration,
chemicals, dissolved solids, reactive stoichiomctry, and aspects of wastewater treatment relative to the
individual units. All of the calculations are executed at each time step of the simulation which is typically
based per hour but can have any granularity from days down to minutes. For calculating the treatment
capacity, the model is run to steady state with a fixed input flow of the rated flow capacity. The model then
reports the resulting water characteristics of every stream in the plant process.
Once configured by the engineer the model software reports the operational characteristics of each unit in
the plant in complete detail. The following are the summary pages from each unit in the process showing
the concentrations and mass flows of the components typically needed to make decisions for process
improvements or for regulators to make decisions.
Model Results and Background
The process flow diagram of Figure 1 and 2 show all of the process units at the Seagrove plant.
Historically the 30,000 gpd, 25 foot diameter unit accepted domestic flow from the Lucks processing
plant, while the 60,000 gpd, 38 foot diameter unit accepted the food waste flow from the canning
processes. Because the food waste had many small particulates and grease, there was installed a DAF
unit in that industrial flow to remove these components. Today the bar screen is not present and the DAF
unit is not in the water district's collected flow. Today the collection system's pump station flows
directly to a splitter box which presently directs flow to the smaller 30,000 GPD unit.
The model execution showed that the two package units, in tandem, can safely accept 90,000 GPD of
standard strength domestic wastewater flow at the temperature extremes, and remove the wastewater
components to concentrations below those required for land application listed in section 02T, all except
Fecal Coliform. The volume of the chlorine contact chamber is 1003 gallons. This volume is appropriate
for the 30,000 gpd unit to achieve the needed residence time when the water temperature is 51 degrees or
above, but at low temperatures, it cannot accept a higher flow and disinfect the stream to 200 coU100ml
as required in the 02T rules. Since the food waste 60000 gpd unit was never in contact with domestic

wastes it did not carry any coliform bacteria and would not have required disinfection. Fortunately, the
chlorine contact chamber is the simplest unit in a plant to construct and can be added easily.
The model execution further showed that the blowers of each unit are sized appropriated with enough
flow to achieve 4 mg/1 of excess 02 when the wastewater temperature is 82 degrees and the air
temperature is 90 degrees. The model calculates that the secondary clarifiers of each unit will remove
settleable solids from the activated sludge process to achieve TSS below the requirements of the 02T rules
when the RAS and WAS flows are set at the required flows.
Results
Figure 2 on the following page shows the plant layout as it is configured in the GPS-X software. The
layout maps the plant flow from the influent where the pump stations discharge, to the effluent from the
chlorine contactor.

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Meritech Work {girder # .03.12195D.:
Parameters
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and calculatedfor the dilution using tb*e:rnot:Pn,,ojir.t.:of:sa.fiiple,
thereby certify theft lhave reviewed rind ,approve .tires v,.date..:
a-poratory Representative
0421.amco Road, Reidsville, North Carolina:27320
te.t,(.336)3424748.lar t,1.36),3,42.-1522.