WQ0029169_Additional Information Request_20230214

ROY COOPER
Governor
ELIZABETH S. BISER
Secretary
RICHARD E. ROGERS, JR.
Director
NORTH CAROLINA
Environmental Quality
February 14, 2023
JAMMIE ROYALL — TOWN MANAGER
TOWN OF MOUNT OLIVE
114 EAST JAMES STREET
MOUNT OLIVE, NORTH CAROLINA 28365-1711
Subject: Application No. WQ0029169
Additional Information Request
Town of Mount Olive WWTP
Reclaimed Water Generation and
Dedicated Utilization System
Wayne County
Dear Mr. Royall:
Division of Water Resources' Central and Regional staff has reviewed the application package
received November 22, 2022. However, additional information is required before the review may be
completed. Please address the items on the attached pages no later than the close of business on March 16,
2023.
Please be aware that you are responsible for meeting all requirements set forth in North Carolina
rules and regulations. Any oversights that occurred in the review of the subject application package are
still the Applicant's responsibility. In addition, any omissions made in responding to the outstanding items
in Sections A through 0, or failure to provide the additional information on or before the above requested
date may result in your application being returned as incomplete pursuant to 15A NCAC 02T .0107(e)(2).
Please reference the subject application number when providing the requested information. All
revised and/or additional documentation shall be signed, sealed and dated (where needed), with an
electronic response submitted to my attention at: https://edocs.deq.nc.gov/Forms/NonDischarge-Branch-
Submittal-Form-Ver2.
If you have any questions regarding this request, please contact me at [phone] or
[e-mail]. Thank you for your cooperation.
Sincerely,
Erick Saunders, Engineer
Division of Water Resources
cc: Washington Regional Office, Water Quality Regional Operations Section (Electronic Copy)
J. Clark Maness, PE — WithersRavenel (Electronic Copy)
Laserfiche File (Electronic Copy)
=D.E
NORTH CAROLINA
Department of Environmental Duality
North Carolina Department of Environmental Quality I Division of Water Resources
512 North Salisbury Street 11617 Mail Service Center I Raleigh, North Carolina 27699-1617
919.707.9000

Mr. Jammie Royall
February 14, 2023
Page 2 of 4
A. Cover Letter:
1. No comments.
B. Application Fee:
1. No comments.
C. Application:
1. In Item VI.6. of the Reclaimed Water Non -Conjunctive System Application form (FORM: RWNC
06-16), it asks for the equipment information for the spray utilization design element. Please
provide this tabulated information for each different spray nozzle that is provided in this
application.
2. The information in Item VI.8. of the RWNC form was not filled out to describe the new field
configuration as described in this application's plans. This information shall be provided for each
field in this section.
3. Item VIII.1. and 2. of the RWNC form states that the system will be used to irrigate food chain
crops for human consumption and meet Type 2 reclaimed water standards for indirect contact
irrigation. There are additional considerations for Type 2 reclaimed water facilities listed in 15A
NCAC 02U .1400 that do not appear to be included in this application, and the cover crop listed in
Item VI.9. of the RWNC form is Coastal Bermuda, indicating that this section may have been
included by mistake. Please clarify whether this system will irrigate food chain crops as covered
under 02U .1400.
D. Property Ownership Documentation:
1. No comments.
E. Soil Evaluation:
1. No comments.
F. Agronomist Evaluation:
1. N/A.
G. Hydrogeologic Report:
1. In accordance with 15A NCAC 02U .0202(c), any new and expanding dedicated reclaimed water
facilities with a design flow over 25,000 gallons per day (GPD) shall have a hydrogeologic
description of the surface prepared by a Licensed Geologist, Licensed Soil Scientist, or Professional
Engineer which includes a mounding analysis to predict the level of the seasonal high water table
after reclaimed water application. As this application proposes a permitted flow rate increase from

Mr. Jammie Royall
February 14, 2023
Page 3 of 4
560,893 GPD to 623,216 GPD, it would be considered an expanding dedicated reclaimed water
facility.
This proposed increase rate is based on the updated field areas and increasing the designed
application rates to match the maximum soil scientist's recommendation. This proposal assumes
that the hydraulic conductivity of the soil is the limiting factor for the disposal capacity of the
facility. However, there is no analysis for how this flow increase would impact the groundwater
flow regime at the site to verify that the groundwater mounding attributed to the operation of the
facility does not violate the one -foot vertical separation between the season high water table and
the ground surface as required by 15A NCAC 02U .0302(k). A hydrogeologic evaluation meeting
the requirements of 15A NCAC 02U .0202(c) shall be submitted to verify that groundwater flow
regime and mounding will not be a limiting factor if the permitted flow rate is increased from
560,893 GPD.
H. Water Balance:
1. See Items I.1. and I.2. The water balance shall be performed using the acreages that only include
the wetted areas of the specified sprayheads that are shown in the plans.
2. It is unclear how the "Total: Influent + Lagoon Gains & Losses" values were calculated in "Table
18. Water Balance for All Zones". It does not correspond to the monthly lagoon gains and losses
added to the monthly design influent volume. Please clarify how these values were obtained.
3. The modification seeks to increase the permitted flow of this permit to 623,216 GPD. However,
Table 18 of the Water Balance indicates that the design daily influent flow is 600,435 GPD, with
the remaining flow coming from inputs and outputs from the storage lagoon. Please note based on
this, a permitted rate would only be increased to 600,435 GPD. A response to this item is not
required.
I. Engineering Plans:
1. The Washington Regional Office noted in their site visit that the wetted areas of the installed spray
heads did not overlap as they were indicated on the plan sheet for these fields. Currently configured,
the sprayheads do not utilize the full extent of the field as depicted on the plans, and the reduced
wetted area from these installed facilities reduces the disposal capacity of the system. The irrigation
facilities shall be reevaluated to match the wetted area of the fields in the plans with their actual
observed wetted area. This evaluation shall include a calibration of the system that tries to configure
the actual observed wetted area with wetted areas in the current plans in order to maximize the
disposal capacity. If what is observed does not match what is in the plans after this calibration, the
plans shall be updated to depict the correct wetted acreage for each field, and the areas of each field
shall be recalculated based on this change.
2. The acreages of the fields for the new subzones don't appear to correspond to the actual disposal
areas irrigated by the new reduced sprayheads. For instance, on Sheet 2 of the plans, Field 3R is
shown to only be dosed by a single SG Type 3 spray gun (a Nelson Big Gun 100 Series Ring Nozzle
0.89") while the listed/reported spray field area is 169,651 square feet (-3.9 acres). The Wetted
Diameter of a full circle 0.89" 100 Ring Nozzle given in Table 2 of the Sprayfield Water Model
Analysis provided in the application is around 270-290 feet when operated between 60 and 70 psi
(65 psi is the calculated maximum pressure at this nozzle in Table 5). The wetted area of a 290 foot
diameter circle is approximately 1.52 acres, which is a little more than half what is listed here.

Mr. Jammie Royall
February 14, 2023
Page 4 of 4
The 169,651 square foot area of Field 3R appears to come from to the Usable Area Calculation box
shown on Attachment 2 of the November 15, 2022 "Land Application of Reclaimed Water — Soil
Scientist Evaluation Report" performed by AWT. The Reduced Application Areas polygon shown
on Sheet 2 of the plans seems to come from the field delineation on this Attachment 2, but not all
the specified usable area is utilized and includes a sizable extent that would not receive any
irrigation. This appears to also be the case of Field 4R, and to a lesser extent for Fields 7R and 9R.
For the purposes of field delineations, water balance calculations, and design calculations, only the
wetted area shall be included in this field sizing. The areas of each field shall be recalculated to
correspond to the wetted acreage of the sprayheads, and the extent of each field shall be shown on
an updated plan package.
J. Specifications:
1. No comments.
K. Engineering Calculations:
1. See Comments I.1 and I.2. The area of Field 3R on Table 3 of the Water Balance Calculation is
3.89 acres and the area on Table 4 of the Sprayfield Water Model Analysis is 172,788 square feet
(3.97 acres). However, the wetted acreage is closer to 1.52 acres based on the spray diameters at
the specified pressure. The application rates for all field shall be recalculated utilizing the wetted
acreage of each fields to verify that there are not any violations of the instantaneous or annual
hydraulic loading rates at the designed field run times.
L. Site Map:
1. No comments.
M. Power Reliability Plant:
1. N/A.
N. Operation & Maintenance Plan:
1. Condition I.3. of the previous permit issued October 12, 2020 required that a Final Operation and
Maintenance Plan be submitted for review. Condition I.6. of this permit stated operation of these
facilities were contingent on the completion of the required documentation listed in Conditions 1.3.,
I.4., and I.S. Conditions I.4. and 1.5. have been received, but operation of this facility cannot be
issued until documentation fulfilling Condition 1.3. has been received.
O. Residuals Management Plan:
1. N/A