WQ0037287_Additional Information Request_20210608

ROY COOPER
Governor
S. DANIEL SMITH
Director
NORTH CAROLINA
Environmental Quality
June 8, 2021
MAURICE W. GALLARDA, P.E. — MANAGING MEMBER
PLURIS HAMPSTEAD, LLC
5950 BERKSHIRE LANE, SUITE 800
DALLAS, TEXAS 75225
Subject: Application No. WQ0037287
Additional Information Request
Pluris Hampstead WWTP
High -Rate Infiltration System
Pender County
Dear Mr. Gallarda:
Division of Water Resources' Central and Regional staff has reviewed the application package
received March 23, 2021. 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 July 8, 2021.
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 P, or failure to provide the additional information on or before the above requested
date may result in your application being returned as incomplete.
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 copy submitted to my attention at the email address below or to our upload site (URL:
https:Hedocs.deg .nc. gov/Forms/NonDischarge-Branch-Submittal-Form-Ver2).
If you have any questions regarding this request, please do not hesitate to contact me at (919) 707-
3660 or Lauren.Plummer(a�ncdenr.gov. Thank you for your cooperation.
Sincerely,
DocuSign d by: D
�Q.IA/�RJI�. �((.1A.P— I Q.11vWLVYI.P/V
�1I@zPlummer, Engineer III
Division of Water Resources
cc: Wilmington Regional Office, Water Quality Regional Operations Section (Electronic Copy)
Michael C. Gallant, PE — Michael C. Gallant, PE, PA (Electronic Copy)
Permit Application File WQ0037287
D ��� 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
NORTH CAROLINA +
D."rh.M.1 emimnm"iquei� /� 919.707.9000

Mr. Maurice W. Gallarda
June 8, 2021
Page 2 of 5
A. Cover Letter:
1. The basis of design document listed flowmeters, dissolved oxygen meters, and all other associated
devices as already being in place for this modification. How long has this equipment been on -site,
and is this equipment in good working order and calibrated?
B. Application Fee:
1. No comment.
C. Application:
Within the wastewater treatment facility design criteria (Item V.1 I.c), the disinfection section was
not completed. Please indicate the method of disinfection being utilized for the expanded treatment
capacity.
2. Per Item IV.10, the groundwater well table under General Requirements, there appears to be some
discrepancy between the well locations provided and those observed in the field and depicted on
the Site Map (Sheet C 1.3). One of the monitoring wells appears to have been installed south of the
borrow pit pond instead of north of the pond as proposed in the existing permit. Please provide
updated location information for the installed wells to the nearest tenth of a second.
D. Property Ownership Documentation:
Property ownership of parcel (3271-08-8507-0000), the location of the groundwater storage pond,
appears to be owned by a `Blake Farm" and not Pluris Hampstead, LLC. Has an agreement
between Pluris Hampstead, LLC and Blake Farm Pond, LLC been recorded with the Pender County
Register of Deeds pursuant to 15A NCAC 02T .0108(b)(1)(B) per Condition L3 of the existing
permit and pursuant to 15A NCAC 02T .0704(f)? Please provide a copy of the recorded agreement
and note that this will also satisfy Condition L3 of the existing permit.
E. Soil Evaluation:
1. Not applicable.
F. Agronomist Evaluation:
1. Not applicable.
G. Hydro2eolo2ic Report:
1. Not applicable.

Mr. Maurice W. Gallarda
June 8, 2021
Page 3 of 5
H. Water Balance:
1. Not applicable.
I. EnaineerinE Plans:
1. Within the plan sheets the notation " Q1, Q2, and Q3 is used. It appears that this refers to phases
with Q1 = 250,000 gallons per day (GPD) having been installed and currently in operation.
However, Q2 is listed at 625,000 GPD, but it is our understanding that the current phase expansion
is to a total capacity of 500,000 GPD. Please provide clarification and revise the Plan Sheets as
necessary.
2. Within the plan sheets there are two C 1.3 sheets, the first depicts the Site Map and the second
depicts a more detailed plan view of the treatment structures. The second C1.3 was signed and
sealed but not dated. The date on this sheet reads "xx/xx/xxxx". Please revise and submit a fully
certified plan sheet.
3. Per Sheet P&ID 1.3 of 8, it appears that the labels for the digester and equalization lines are flipped.
Please review and revise as needed.
4. Are the chemical storage tanks and chemical metering pumps sufficiently sized for the increased
capacity? Chemical dosing is referenced within the membrane bioreactor sheets but the reference
sheets were not included in the submittal. These components were not mentioned within the Basis
of Design document and did not appear to be depicted in the Plan Set.
5. Detail drawings for key components such as trenching/bedding requirements, pipe insulation, valve
boxes, and other appurtenances were not provided. Please provide the detail drawing sheets for
our review.
J. Specifications:
A project construction sequence was not included within the provided specifications. Will
infiltration activities be shutdown for construction activities? Please provide a construction
sequence and indicate which tasks will require bypassing or operations shutdown.
2. Within the equipment specifications please indicate the total number of pumps/blowers units to be
installed and indicate that a backup/standby unit is being provided as needed to meet the
requirements of 15A NCAC 02T .07050).
3. Within the specifications it lists that the wasting/rescreening pumps are to have an operating point
of 75 gallons per minute (GPM) and a note within the engineering calculations indicates that each
pump is to be sized at 75 GPM. The provided documentation within Appendix I Tab 6 for the
wasting/rescreening pumps appears to indicate an operating point of 26.5 GPM at 16.9ft of head.
Please review and provide clarification or revision as necessary.

Mr. Maurice W. Gallarda
June 8, 2021
Page 4 of 5
K. En2ineerin2 Calculations:
1. Within the provided calculations and basis for design documents, it appears that the design
parameters are based off of values published within "Wastewater Treatment Plants -Planning
Design and Operation". Have samples from the facility been collected to confirm that the published
values are representative of those experienced at this facility?
2. Please provide the spreadsheets/formulas utilized in the design calculations for our review.
L. Site Map:
1. No comment.
M. Power Reliability Plan:
1. No comment.
N. Operation & Maintenance Plan:
1. An Operation & Maintenance (O&M) Plan was not provided as part of the project submittal. Within
the application checklist, it is indicated that an O&M Plan is to be submitted with all application
packages. Please review the existing O&M Plan, revise the plan as necessary for the proposed
modifications, and submit for our review. The O&M Plan must meet the requirements outlined
within 15A NCAC 02T .0707.
O. Residuals Management Plan:
1. No comment.
P. Additional Documentation:
➢ Certificate of Public Convenience and Necessity:
1. No comment.
➢ Existing Permit:
1. Within the existing permit, the facility description lists the membrane bioreactors (MBR), but
a tank volume was not provided. Please provide the as -built tank volume for the existing MBR
units.
➢ Final Environmental Document:
1. Not applicable.
➢ Floodway Regulation Compliance:
1. Not applicable.

Mr. Maurice W. Gallarda
June 8, 2021
Page 5 of 5
➢ Operational Agreements:
1. Not applicable.
➢ Threatened or Endangered Aquatic Species Documentation:
1. Not applicable.
➢ Wastewater Chemical Analysis:
1. Not applicable.

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