WQ0002708_More Information Received_20210517

Non-Discharge Branch Upload/Submittal Form (W)
NORTH CAROLINA
Envinonment&Qvvflly
Version 2-Revised June 23,2020
Initial Review
Reviewer Thornburg,Nathaniel D
Is this submittal an application?(Excluding additional information.)*
r Yes 6' No
If not an application what is the submittal type?* r Annual Report
✓ Residual Annual Report
• Additional Information
✓ Other
Permit Number(IR)* WQ0002708
Applicant/Permittee City of Raleigh
Email Notifications
Does this need review by the hydrogeologist?* r Yes F No
Regional Office
CO Reviewer
Admin Reviewer

Submittal Form
Project Contact Information
Rease provide infornation on the person to be contacted by NEB Staff regarding electronic subnittal,confirmation of receipt,and other correspondence.
Name* Christopher Phelps
Email Address* Phone Number*
[e-mail] 919-996-3172
Project Information
Application/Document Type* r New(Fee Required) O Modification-Minor
✓ Modification-Major(Fee Required) C Renewal
✓ Renewal with Major Modification(Fee C GW-59,NDMR,NDMLR,NDAR-1,
Required) NDAR-2
✓ Annual Report r Residual Annual Report
c Additional Information r Change of Ownership
✓ Other
We no longer accept these monitoring reports through this portal. Please click on the link below and it will take you to the correct form.
https://edocs.deq.nc.gov/Forms/NonDischarge_Monitoring_Report
Permit Type:* r Wastewater Irrigation r High-Rate Infiltration
✓ Other Wastewater r Reclaimed Water
✓ Closed-Loop Recycle r Residuals
✓ Single-Family Residence Wastewater r Other
Irrigation
Permit Number:* WQ0002708
Has Qirrent Existing permit number
Applicant/Permittee Address* PO Box 590 Raleigh NC 27602-0590
Facility Name* Wrenn Road WWTF
Please provide comments/notes on your current submittal below.
Ms.Zhong,
On April 15,2021,the City of Raleigh received an additional information request for the
permit application package for Permit No.WQ0002708 for the Wrenn Road Spray Irrigation
Facility.The application package was submitted to address the modification to two irrigation
fields due to the construction of NC Highway 540.NC DEQ requested additional information
be submitted by May 17,2021,which is approximately one month from initial receipt of the
permit application comments.
At this time,paper copies are no longer required.If you have any questions about what is required,please contact Nathaniel Thornburg
at [e-mail].
Please attach all information required or requested for this submittal to be reviewed here.*
(Application Form Engineering Flans,Srrcifications,Calculations,Etc.)
WQ0002708 Response Package_5.17.2021.pdf 69.5MB
Upload only 1 PFdocument(less than 250IvB).Mitiple documents must be combined into one R]Ffile unless file is larger than
upload limit.
*IW By checking this box,I acknowledge that I understand the application will not be
accepted for pre-review until the fee(if required)has been received by the Non-
Discharge Branch.Application fees must be submitted by check or money order
and made payable to the North Carolina Department of Environmental Quality
(NCDEQ).I also confirm that the uploaded document is a single PDF with all parts
of the application in correct order(as specified by the application).
Mail payment to:
NCDEQ—Division of Water Resources
Attn:Non-Discharge Branch
1617 Mail Service Center
Raleigh,NC 27699-1617

Signature
Submission Date 5/17/2021

May 14, 2021
Ms. Vivien Zhong, PE
Environmental Engineer
Non-Discharge Branch
Department of Environmental Quality
512 N. Salisbury Street
Raleigh, NC 27604
Dear Ms. Zhong,
On April 15, 2021, the City of Raleigh (City) received an additional information request for the permit
application package for Permit No. WQ0002708 for the Wrenn Road Spray Irrigation Facility. The
application package was submitted to address the modification to two irrigation fields due to the
construction of NC Highway 540. NC DEQ requested additional information be submitted by May 17,
2021, which is approximately one month from initial receipt of the permit application comments.
The following comments were received, and responses are provided below.
A. Application Form WWIS 06-16:
1. Comment: The Form is not signed by the applicant on the last page. Mr. Chris Phelps is
not a delegated signature authority for this permit yet. Pursuant to 15A NCAC 02T .0106,
please have an executive officer or elected official complete the attached signature
delegation letter before Mr. Chris Phelps can sign the application. Otherwise, please
update application form Section I and have the executive office or elected official sign the
application form.
i. Response: Mr. Chris Phelps is a delegated signature authority for WQ0002708.
A signature authority designation letter(Attachment 1)was submitted to DEQ in
March of 2016, and it was confirmed that the letter is sufficient for addressing this
comment(Attachment 2). Chris Phelps has signed the last page of the permit
application, which is provided in Attachment 3.
2. Comment: The application rates listed under Section VI I.B. are not consistent with the
May 4, 2020 issued permit. Please clarify and update the application form as needed.
i. Response: The application rates listed under Section VII.8 are the original design
loading rates for each field, which were provided by the soil scientist as part of
the original permit request. The City is requesting the application rates developed
by the soil scientist be utilized to determine the irrigation application rate in lieu of
the application rates currently stated in the permit.
E. Engineering Calculations
1. Comment: The application rates used in the calculations are not consistent with the May
4, 2020 issued permit. Please clarify and update the calculations as needed.
i. Response: The application rates used in the calculations are the original design
loading rates for each field, which were provided by the soil scientist as part of
the original permit request. The City is requesting the application rates developed

by the soil scientist be utilized to determine the irrigation application rate in lieu of
the application rates currently stated in the permit.
2. Comment: Please clarify whether the 662,216 gallons per day(GPD) is the design facility
influent flow or the long-term average influent flow.
i. Response: 662,216 GPD is the design facility influent flow, calculated using field
application rates developed by the soil scientist and the change in available
acreage at the Wrenn Road Facility due to the construction of NC Highway 540.
This value was calculated using the same methodology as the original permit
application, and was determined using the following steps:
1. The individual field application rates were multiplied by the available
individual field acreage to determine the GPD allowed per field.
2. The GPD allowed for each of the fields was added to obtain the total
irrigable flow rate GPD for the irrigation fields as a whole. This value
represents the flow rate that can be transferred from the lagoons to the
irrigation fields.
3. The estimated lagoon gains (e.g. precipitation), as determined by the
original water balance report used when initially permitting the Wrenn
Road Facility in GPD, was subtracted from the total irrigable flow rate to
obtain the allowable Wrenn Road Facility influent flow rate of 662,216
GPD.
F. Site Map:
1. Comment: On Sheet 1 of Attachment H, there are portions of Field 1 B, 6B, 7A, and 7B
within the spray buffer. Please clarify.
i. Response: This has been addressed. A revised site map is provided in
Attachment 4.
2. Comment: According to the permit issued May 4, 2020, the existing monitoring well MW-
3 is located north of Field 6B, while it showed up south of Field 3B on the site map.
According to the same permit, the existing MW-9 is located west of Field 7A, but it is not
found on the site map. Please clarify.
i. Response: The well located north of Field 6B is "MW-B-3"and has been added
to the site map. MW-3 is located south of Field 3B as is currently shown on the
site map. The well located west of Field 7A is "MW-B-9"and has also been
added to the site map. A revised site map is provided in Attachment 4.
3. Comment: PMW-1 and PMW-2 are close to MW-3 and PMW-3 is close to MW-9. Please
clarify whether PMW-1 through PMW-4 are proposed compliance monitoring wells or
currently active wells as indicated in the application form Section IV.10. to be added to
the permit in addition to the existing compliance monitoring wells MW-3, MW-8, and MW-
9. If this is the case, please rename PMW-1 through PMW-4 as MW-10 through MW-13
and reflect the names on the application form and the site maps. Please also explain why
PMW-1 through PMW-4 are outside of the compliance boundary.

i. Response: Wells MW-3, MW-8, and MW-9 referenced above are referred to as
"MW-B-3,""MW-B-8,"and "MW-B-9."Wells PMW-1 through PMW-4 are
temporary wells that were installed for the program approved by NC DEQ for the
purpose of establishing site-specific concentrations of arsenic, iron and
manganese as described in Groundwater Monitoring Plan for the Wrenn Road
Facility Wastewater Irrigation System (Attachment 5) and Sampling and Data
Analysis for Background Concentrations of As, Fe, and Mn in Groundwater
(Attachment 6). As such their locations were approved by NC DEQ as
necessarily having to be outside the compliance boundary and up-gradient of any
of the application fields.
1. It is the preference of the applicant that the numbering remain as-is
because these wells continue to be monitored as part of the ongoing
background monitoring well program, and re-numbering them would
introduce unnecessary confusion with the reports that have been
prepared and submitted to DEQ. Additionally, PMW-1 through PMW-4
are temporary wells that will be properly abandoned at the completion of
this study and after approval from NC DEQ.
4. Comment: Please create an overall site map with the proposed area removed, the review
and compliance boundaries indicated, all existing and proposed compliance monitoring
wells indicated, and without the sheet sections as shown on Sheet 1 of Attachment H.
i. Response: An overall site map is provided with the original site map in
Attachment 4. This new overall site map no longer shows the irrigation area that
is no longer in use. This map does show the review and compliance boundaries,
and all compliance and background monitoring wells at the Wrenn Road Facility.
The original permit application provided information regarding the Emerald Ash Borer(EAB) presence at
the Wrenn Road Facility (Attachment K of the original permit modification application). The City will
address crop replacement at a later date.
Should you have any questions regarding this additional information, please feel free to contact me at
[phone].
Sincerely,
DocuSigned by:
CA .P&44
B97085214CA94AE...
Chris Phelps
Raleigh Water
Water Division Manager
Enclosures
cc: Bryan Hamilton, Raleigh Water
Jessee Walker, Raleigh Water
Whit Wheeler, PE, Raleigh Water
Dennis Lassiter, PE, Raleigh Water
Chris Brown, PE, HDR
Samantha Black, PhD, PE, HDR

I
Signature Authority
Designation Letter

f�� of naTFr�s .
Ji ��2/
4(,p 41caO
(Jeff; gi gazer
NORTH CAROLINA
March 17, 2016
Mr.Rick Bolich-Non-Discharge Mr.Danny Smith-Discharge
Division of Water Resources,RRO Division of Water Resources,RRO
1628 Mail Service Center 1628 Mail Service Center
Raleigh,NC 27699-1628 Raleigh,NC 27699-1628
Subject: ORC Designation and Permitting Signature Authority, City of Raleigh,Wastewater
Discharge, Non-Discharge Permits and Collection System Permit
Dear Sir:
As the appropriate signing official for City of Raleigh as designated, I hereby delegate
activities associated with permit signature authority to those individuals listed below as
Permittee.We are also notifying the Division of those individuals assigned as Operators in
Responsible Charge (ORC) and Backup Operators in Responsible Charge (BORC) for the
following discharge permits (NPDES) and Non-discharge systems.
City of Raleigh - Public Utilities Department NPDES Permits
Facility NPDES# ORC BORC Certificate
Type/Grade/Number
Neuse River RRF NC0029033 Gibson, John WW/4/15206
Howell, Nathan D. WW/4/999733
Permittee Shaw,Wade WW/4/995083
Woody, Tim
Gay, Brian C. WW/4/9187
One Exchange Plaza City of Raleigh Municipal Building
1 Exchange Plaza,Suite 1020 Post Office Box 590• Raleigh 222 West Hargett Street
Raleigh, North Carolina 27601 North Carolina 27602-0590 Raleigh, North Carolina 27601
(Mailing Address)
Printed on Recycled Paper

Facility NPDES# ORC BORC Certificate
Type/Grade/Number
Smith Creek WWTP NC0030759 Shaw, Wade WW /4/ 995083
Loveless, Michael WW /4/ 10774
Permittee Silveri, John WW /4/ 986489
Woody, Tim O'Driscoll, Neil A. WW /4/ 27168
Gay, Brian C. WW /4/ 9187
Gibson, John WW /4/ 15206
Facility NPDES# ORC BORC Certificate
Type/Grade/Number
Little Creek WWTP NC0079316 Gay, Brian C. WW /4/ 9187
Holmes, Jennifer A. W W /4/ 992797
Permittee Watkins, Mike WW /4/ 14445
Woody, Tim Shaw, Wade W. WW /4/ 995083
Gibson, John WW /4/ 15206
Facility NPDES# ORC BORC Certificate
Type/Grade/Number
GG Hill WTP NC0007528 Walker, Jessee PC/1/28902
Permittee Hamilton, Bryan PC/1/986461
Phelps, Chris
Facility NPDES# ORC BORC Certificate
Type/Grade/Number
E.M. Johnson WTP NC0082376• Hamilton, Bryan PC/1/986461
Permittee Marshburn, James PC/1/988644
Phelps, Chris
Facility NPDES# ORC BORG Certificate
Type/Grade/Number
DE Benton WTP NC0088285 Walker, Jessee PC/1/28902
Permittee Hamilton, Bryan PC/1/986461
Phelps, Chris Hughes, Mike PC/1/997565
City of Raleigh - Public Utilities Department Non-Discharge Permits
Facility Non ORC BORC
Discharge
NRRRF-Reuse Dist WQ00016222 Dalton, Marla SI - 995909
Permittee Woody, Tim SI - 14942
Woody, Tim Blackmon, Jeremy SI - 994479
Facility Non ORC BORC Certificate
Discharge Type/Grade/Number
SCWWTP-Reuse Dist WQ0032757 Dalton, Marla SI - 995909
Permittee Shaw, Wade SI - 997624
Woody, Tim Loveless, Mike SI - 995906
One Exchange Plaza City of Raleigh Municipal Building
1 Exchange Plaza, Suite 1020 Post Office Box 590 • Raleigh 222 West Hargett Street
Raleigh, North Carolina 27601 North Carolina 27602-0590 Raleigh, North Carolina 27601
(Mailing Address)
Printed an Recycled Paper

Facility Non ORC BORC Certificate
Discharge Type/Grade/Number
LCWWTP-Reuse Dist WQ0020409 Dalton, Marla SI - 995909
Permittee Gay, Brian SI - 22441
Woody, Tim Holmes, Jennifer SI - 985243
Facility Non ORC BORC Certificate
Discharge Type/Grade/Number
Wrenn Rd Spray WQ0002708 McLamb, Tracy SI - 15950
Honeycutt, Steve SI - 988689
Permittee Batchelor, Eric SI - 991560
Phelps, Chris
Facility Non ORC BORC Certificate
Discharge Type/Grade/Number
NRRRF LA WQ0001730 Blackmon, Jeremy LA — 993108
Denning, Barrett LA - 997278
Permittee Nichols, David LA - 1000056
Woody, Tim
Facility Non ORC BORC Certificate
Discharge Type/Grade/Number
NRRRF Dist & Market WQ00011583 Blackmon, Jeremy LA - 993108
Rieg, Joseph LA - 998014
Permittee Denning, Barrett LA - 997278
•
Woody, Tim
Facility Non ORC BORC Certificate
Discharge Type/Grade/Number
EMJWTP-Reuse Dist WQ0022036 Dalton, Marla SI - 995909
Hamilton, Bryan PC/1/986461
Permittee Marshburn, James PC/1/988644
Woody, Tim
Facility Non ORC BORC Certificate
Discharge Type/Grade/Number
Wrenn Rd Dist & Market WQ0034833 Blackmon, Jeremy LA - 993108
Rieg, Joseph LA - 998014
Permittee Denning, Barrett LA - 997278
Woody, Tim
One Exchange Plaza City of Raleigh Municipal Building
1 Exchange Plaza, Suite 1020 Post Office Box 590 • Raleigh 222 West Hargett Street
Raleigh, North Carolina 27601 North Carolina 27602-0590 Raleigh, North Carolina 27601
(Mailing Address)
Printed on Recycled Paper

Facility Non ORC BORC Certificate
Discharge Type/Grade/Number
EMJWTP Dist & Market WQ0033167 Blackmon, Jeremy LA - 993108
Permittee Denning, Barrett LA - 997278
Woody, Tim Rieg, Joseph LA - 998014
Facility Non ORC BORC Certificate
Discharge Type/Grade/Number
EMJWTP Surface Disposal WQ0008431 Hamilton, Bryan PC/1/986461
Permittee Marshburn, James PC/1/988644
Phelps, Chris
Facility Non ORC BORC Certificate
Discharge Type/Grade/Number
SCWWTP Land App WQ0012349 Shaw, Wade LA - 997294
Permittee Loveless, Mike LA - 21060
Woody, Tim Blackmon, Jeremy LA - 993108
Facility Collection ORC BORC Certificate
System Type/Grade/Number
Collection System WQCS00002 Johnson, Thomas CS/4/22726
O'Grady, Marc CS/4/996840
Permittee Jackson, David CS/3/996259
Vessie, Matthew Diaz, Roxell CS/4/1001665
This is effective, March 9, 2016. Should you have any questions, please contact me at the
following:
Permittee/Applicant name (please print): Ruffin L. Hall
Title: City Manager
Complete mailing address: P.O. Box 590
City: Raleigh State: NC Zip: 27602
Telephone number: ( 919 ) 996-3070 Facsimile number: ()
Sincerely,
Ruffi9 . Hall, City Manager
Cit Raleigh
One Exchange Plaza City of Raleigh Municipal Building
1 Exchange Plaza, Suite 1020 Post Office Box 590 • Raleigh 222 West Hargett Street
Raleigh, North Carolina 27601 North Carolina 27602-0590 Raleigh, North Carolina 27601
(Mailing Address)
Printed on Recycled Paper

2
Confirmation that Signature
Authority Designation Letter
is Sufficient Documentation

Black, Samantha
From: Brown, Chris
Sent: Tuesday, April 27, 2021 1:53 PM
To: Black, Samantha
Subject: FW: [External] RE: Additional Information Request: WQ0002708 - Wrenn Road WWTF
Christopher H. Brown, PE
D 919.232.6657 M 919.604.1455
hdrinc.com/follow-us
From:Zhong,Vivien <[e-mail]>
Sent: Monday,April 19, 2021 11:34 AM
To: Phelps, Chris<[e-mail]>
Cc: Brown, Chris<[e-mail]>; Manuel,Vanessa <[e-mail]>; Vinson, Scott
<[e-mail]>;Thornburg, Nathaniel <[e-mail]>
Subject: RE: [External] RE:Additional Information Request: WQ0002708-Wrenn Road WWTF
CAUTION: [EXTERNAL] This email originated from outside of the organization. Do not click links or open attachments
unless you recognize the sender and know the content is safe.
Hi Mr. Phelps,
Thanks for providing the letter— It is sufficient, and I will upload it to our files and update the information in our system
for future reference.
You can submit the request information to me directly via email or use the upload portal if the file is too large.
Thanks,
Vivien
From: Phelps, Chris<[e-mail]>
Sent: Monday,April 19, 2021 10:45 AM
To:Zhong,Vivien <[e-mail]>
Cc: Brown, Chris<[e-mail]>; Manuel,Vanessa <[e-mail]>; Vinson, Scott
<[e-mail]>;Thornburg, Nathaniel <[e-mail]>
Subject: [External] RE: Additional Information Request: WQ0002708-Wrenn Road WWTF
CAUTION: External email. Do not click links or open attachments unless you verify.Send all suspicious email as an attachment to
Report Spam.
Ms. Zhong, Thank you.
We will review and provide the quested information. As an immediate follow up to the Application Form
WWIS 06-16 signature response we did submit a signature authority designation letter (attached) back in
March of 2016 in which I was listed as the Permittee for WQ0002708. If this information is not acceptable I
i

will follow up with the form that you had attached. Do I need to resubmit the package through the Non
Discharge Branch upload portal after signature?
Chris Phelps
Water Division Manager
City of Raleigh
Public Utilities I Raleigh Water
(p) 919-996-3172
raleighnc.gov
From:Zhong,Vivien <[e-mail]>
Sent:Thursday,April 15, 2021 10:57 AM
To: Phelps, Chris<[e-mail]>
Cc: Brown, Chris<[e-mail]>; Manuel,Vanessa <[e-mail]>; Vinson, Scott
<[e-mail]>;Thornburg, Nathaniel <[e-mail]>
Subject:Additional Information Request: WQ0002708-Wrenn Road WWTF
Hi Mr. Phelps,
Please see attached additional information request and let me know if you have any questions.
To answer your questions under Attachment K:
1. Will there be impacts to spray irrigation application rates if trees are replaced with fescue?This will depend
on the soils evaluation. If the loading rates increase as a result, the current setbacks specified in 15A NCAC
02T .0506 would apply.
2. Is there a process required by DEQ to change the crop as a result of the decline in ash tree health?An
updated agronomist report, a soils evaluation after the new crop has been established to determine the new
loading rates, and possibly an updated water balance would be needed for this modification.
Vivien Zhong, PE
Environmental Engineer
Non-Discharge Branch
Department of Environmental Quality
919 707 3627 office
vivien.zhong(a ncdenr.gov
512 N. Salisbury St.
1617 Mail Service Center
Raleigh, North Carolina 27699-1617
Email correspondence to and from this address is subject to the
North Carolina Public Records Law and may be disclosed to third parties
2

Application Form WWIS 06-
16 Signature Page

Professional Engineer's Certification:
I, C lt R% s To('1kZe•. -g o W A(4 0 attest that this application for
(Professional Engineer's name from Application Item III.1.)
\Nr t$M 'ROAD S('fo1'a 1g121 b /�'ftorJ FAC14i-r%
(Facility name from Application Item II.1 .)
has been reviewed by me and is accurate, complete and consistent with the information supplied in the plans, specifications, engineering
calculations, and all other supporting documentation to the best of my knowledge. I further attest that to the best of my knowledge the
proposed design has been prepared in accordance with this application package and its instructions, as well as all applicable regulations
and statutes. Although other professionals may have developed certain portions of this submittal package, inclusion of these materials
under my signature and seal signifies that I have reviewed this material and have judged it to be consistent with the proposed design.
NOTE — In accordance with General Statutes 143-215.6A and 143-215.6B, any person who knowingly makes any false statement,
representation, or certification in any application package shall be guilty of a Class 2 misdemeanor, which may include a fine not to
exceed $10,000, as well as civil penalties up to $25,000 per violation.
North Carolina Professional Engineer's seal, signature, and date:
C.M
Applicant's Certification per 15A NCAC 02T .0106(b):
I, Christopher Phelps, Water Division Manager attest that this application for
(Signature Authority's name & title from Application Item I.3.)
Wrenn Road Spray Irrigation Facility
(Facility name from Application Item II.1 .)
has been reviewed by me and is accurate and complete to the best of my knowledge. I understand that any discharge of wastewater
from this non-discharge system to surface waters or the land will result in an immediate enforcement action that may include civil
penalties, injunctive relief, and/or criminal prosecution. I will make no claim against the Division of Water Resources should a condition
of this permit be violated. I also understand that if all required parts of this application package are not completed and that if all required
supporting information and attachments are not included, this application package will be returned to me as incomplete. I further certify
that the Applicant or any affiliate has not been convicted of an environmental crime; has not abandoned a wastewater facility without
proper closure, does not have an outstanding civil penalty where all appeals have been exhausted or abandoned, are compliant with any
active compliance schedule, and do not have any overdue annual fees per 15A NCAC 02T .0105(e).
NOTE — In accordance with General Statutes 143-215.6A and 143-215.6B, any person who knowingly makes any false statement,
representation, or certification in any application package shall be guilty of a Class 2 misdemeanor, which may include a fine not to
exceed $10,000 as well as civil penalties up to 25 000 per violation.
Signature: Date: 04/19/2021
FORM: WWIS 06-16 Page 14 of 12

4
Revised Wrenn Road Facility
Site Map

1 2 3 4 5 6 7 8
WRENN ROAD CITY OF RALEIGH
PROJECT
NO .
10273665
INDEX OF DRAWINGS
GENERAL
.
SHEET 1 OF 12 COVER
SHEET 2 OF 12 TABLES & LEGEND
SITE WORK :
SHEET 3 OF 12 SPRINKLER SYSTEM-PLAN A
SHEET 4 OF 12 SPRINKLER SYSTEM-PLAN B
SHEET 5 OF 12 SPRINKLER SYSTEM-PLAN C B
SHEET 6 OF 12 SPRINKLER SYSTEM-PLAN D
SHEET 7 OF 12 SPRINKLER SYSTEM-PLAN E
SHEET 8 OF 12 SPRINKLER SYSTEM-PLAN F
SHEET 9 OF 12 SPRINKLER SYSTEM-PLAN G
SHEET 10 OF 12 SPRINKLER SYSTEM-PLAN H
SHEET 11 OF 12 SPRINKLER SYSTEM-PLAN I
SHEET 12 OF 12 OVERALL SITE MAP
NOTE: THESE DRAWINGS ARE PREPARED IN SUPPORT OF THE PERMIT APPLICATION
FOR THE WRENN ROAD SPRAY IRRIGATION SYSTEM (PERMIT NO. WQ-0002708). THESE
DRAWINGS ARE NOT PART OF THE DESIGN DRAWINGS AND ARE PROVIDED FOR
REFERENCE ONLY. THE SPRINKLER LAYOUT AND PIPING ARE BASED ON AS-BUILT
DRAWINGS PREPARED BY MUNICIPAL ENGINEERING SERVICES CO., P.A. DATED
01/23/1986. SOIL INFORMATION OBTAINED FROM THE USDA WEB SOIL SURVEY. PARCEL
INFORMATION OBTAINED FROM THE COUNTY GIS SYSTEM. BUILDING FOOTPRINTS
TRACED FROM AERIAL IMAGERY, NOT SURVEYED.
A
HDR Engineering,
PROJECT MANAGER C. BROWN, PE sr�n�re• , `0 /
Inc. of the Carolinas .•'` '••.
DESIGN ENGINEER S. BLACK, PE ��t"��(�i CARQ//••y. `��
555 FAYETTEVILLE CHECKED BY J. LANGSTON, PE ••�Q aM,�P.' ' \
STREET, SUITE 900 DRAWN BY C. GIGLIOTTI, EIT •
SEAL ,z x •
RALEIGH, NC 27601 15370 • �, Raleigh
919.232.6600 — T.cf'�'%eikG1 NE--'Q(• �;?
,AGE ,� ••k' % WRENN ROAD S P RAY IRRIGATION _ = 2" FILENAME SHEET
A 02/24/2021 WRENN ROAD SPRAY IRRIGATION FACILITY REPERMITTING ''•*.*.'mil.;.;'
ps i I FACILITY SITE PLAN SCALE 1" = 500' (ON 24 x 36) COVER
N.C.B.E.L.S. License Number F-0116 ISSUE DATE DESCRIPTION PROJECT NUMBER 10273665

1 2 3 4 5 6 7 8
Property Information Soil Type Legend
Label ID OWNER DEED BOOK DEED PAGE PIN NUMBER REID AaA Altavista Fine Sandy Loam Oto 2%Slope PaD Pacolet Sandy Loam 10to 15%Slope
1 BUFFALOE PRESERVE LLC 12998 2418 1629518996 129686 AmB Appling-Marlboro Complex 1to 6%Slope PaE Pacolet Loam 15 to 25%Slope
2 WHITE, MARY POWELL WARD WARD, ISABEL L 1629715058 74244 ApB Appling Sandy Loam 2 to 6%Slope PbD Pacolet-Urban Land Complex 10to 15%SI
3 B T&BETSY HENDERSON FAMILY LLC MORRIS,ASHLEY CARLYLE JR 14220 1383 1628761326 29998 AsA Augusta Sandy Loam 0 to 2%Slope RaA Rains Sandy Loam 0 to 2%Slope
4 BRYAN,JEAN BALL 7551 671 1628578153 92344 AuA Augusta Fine Sandy Loam 0 to 2%Slope RgB Rawlings-Rion Complex 2 to 6%Slope
5 SAULS,VALLIE L HEIRS 06-E 2411 1628415674 62399
6 N C DEPT OF TRANSPORTATION 7993 885 1628312508 232328 Bb Bibb Sandy Loam 0 to 2%Slope RgC Rawlings-Rion Complex 6 to 10%Slope
7 KOTKOSKY,JOHN KOTKOSKY, ROBERTA 16749 1969 1628128699 123091 BbA Bibb Sandy Loam Oto 2%Slope RgD Rawlings-Rion Complex 10to 15%Slope
8 ANDERSON,THOMAS P ANDERSON, MELISSA T 17221 1532 1628230133 126363 CeB Cecil Loam 2 to 6%Slope RkA Riverview Fine Sandy Loam Oto 2%Slope
9 BIGGERSTAFF,SUSAN ADAIR 8602 2301 1628135570 203199 CeC Cecil Loam 6 to 10%Slope RnF Rion Sandy Loam 15 to 40%Slope
10 ELLEN,JOSEPH L 15126 484 1628048824 347209 CfC Cecil-Urban Land Complex 2to 10% RoA Roanoke Loam Oto 2%Slope
11 STEPHENSON, EDNA M 14-E 1814 1618958992 188343 Ch Chewacla Loam 0 to 2%Slope To Tomotley Sandy Loam 0 to 2%Slope
12 BAUMAN, BRYAN PAUL BAUMAN, MELODY O'TUEL 17330 2785 1618969047 188346 ChA Chewacla and wehadkee Soils 0 to 2%Slope UcC Uchee Loamy Coarse Sand 6to 12%Slope D
13 GRAYSON, KEITH S 10141 1306 1628060203 188347 CoB Cowarts Loamy Sand 2 to 6%Slope UdE Udorthents Loamy Oto 25%Slope
14 WRENCH, DAVID W WRENCH, DEBORA 6776 163 1618967317 188361 CoC Cowarts Loamy Sand 6 to 10%Slope W Water -4 N-1
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15 BUFFALOE PRESERVE LLC 12998 2411 1628075719 9670 DAM Dam WaB Wagram Loamy Sand Oto 6%Slope /Z MW-B-3IP
16 COCKS,JENNIFER ANNE COCKS,THOMAS HENRY 15735 2238 1629203686 168766 DoA Dothan Loamy Sand O to 2%Slope WaC Wake-Rolesville Complex 6to 10%Slope I P W-2 \
17 BUFFALOE PRESERVE LLC 12998 2411 1628067677 463828 DoB Dothan Loamy Sand 6to 10%Slope WaD Wake-Rolesville Complex 10to 15%Slop(
18 BUFFALOE PRESERVE LLC 12998 2411 1628076079 463824 DuB Dothan-Urban Land Complex 0 to 6%Slope WaE Wake-Rolesville Complex 15 to 25%Slop( /
19 BUFFALOE PRESERVE LLC 12998 2411 1628066849 463823 7 )I
20 BUFFALOE PRESERVE LLC 12998 2411 1628067843 463822 FaB Faceville Sandy Loam 2 to 6%Slope WeB Wedowee Sandy Loam 2 to 6%Slope se I
21 ROBUCK HOMES TRIANGLE LLC 17361 668 1628068996 463821 FrB Fuquay Loamy Sand 0 to 6%Slope WeC Wedowee Sandy Loam 6to 10%Slope SHEET 3 OF 11 7 S 4 OF 11
22 BUFFALOE PRESERVE LLC 12998 2411 1628078226 463825 FuB Fuquay-Urban Land Complex 0 to 6%Slope WeD Wedowee Sandy Loam 10 to 15%Slope
23 BUFFALOE PRESERVE LLC 12998 2411 1628079087 463818 GoA Goldsboro Sandy Loam Oto 2%Slopes WeE Wedowee Sandy Loam 2to 6%Slope 7 PMW 1
24 BUFFALOE PRESERVE LLC 12998 2411 1628079411 463826 GrC Gritney Sandy Loam 6 to 10%Slope WfB Wedowee-Saw Complex 2 to 6%Slope / 68 6B
25 ROBUCK HOMES TRIANGLE LLC 17361 668 1628170174 463817 HeB Helena sandy Loam 2 to 6%Slope WgB Wedowee-Urban Land Complex 2 to 6%S 5B \
26 BUFFALOE PRESERVE LLC 12998 2411 1628170501 463827 LyA Lynchburg Sandy Loam O to 2%Slope WgC Wedowee-Urban Land Complex 6 to 15% / / 5A
27 BUFFALOE PRESERVE LLC 12998 2411 1628171241 463816 NkB Nankin Fine Sandy Loam 2to 6%Slope WoB Wedowee Sandy Loam 2to 8%Slope / 1 I
28 BUFFALOE PRESERVE LLC 12998 2411 1628170658 463810 NoB Norfolk Loamy Sand 2to 6%Slope WoD Wedowee Sandy Loam 8to 15%Slope CI 1 O
29 BUFFALOE PRESERVE LLC 12998 2411 1628172219 463815 Wt Wehadkee Loam o to 2%Slope )
30 ROBUCK HOMES TRIANGLE LLC 17361 668 1628171800 463809 6A /
31 BUFFALOE PRESERVE LLC 12998 2411 1628172386 463814 Well Location / sA 6A l
32 ROBUCK HOMES TRIANGLE LLC 17361 668 1628171951 463806 Well ID Latitude Longitude Latitude Longitude
33 BUFFALOE PRESERVE LLC 12998 2411 1628173426 463813 gf /se
34 ROBUCK HOMES TRIANGLE LLC 17361 668 1628181092 463805 CDWW-1 N35° 38'47.76" W78° 35' 07.80" 35.646600 78.585278 ° `'A 58
35 BUFFALOE PRESERVE LLC 12998 2411 1628173578 463812 CDWW-2 N35° 38' 10.68" W78° 35' 37.32" 35.636300 78.593611 eil p 0 1 Ili I
36 ROBUCK HOMES TRIANGLE LLC 17361 668 1628182143 463802 CIW-1 N35° 39' 01.08" W78° 34'49.08" 35.650300 78.580278
PMW-1 N35° 38' 54.53" W78° 34' 31.35" 35.648481 78.575278
37 BUFFALOE PRESERVE LLC 12998 2411 1628174744 463811
38 ROBUCK HOMES TRIANGLE LLC 17361 668 1628182284 463800 PMW-2 N35° 38' 59.34" W78° 34' S1.27" 35.649817 78.580833 \ C
39 ROBUCK HOMES TRIANGLE LLC 17361 668 1628175808 463808 PMW-3 N35° 38' 27.71" W78° 35' 22.14" 35.641031 78.589444 '� 6A
40 STOKES,JOHNNIE C JR 17500 2313 1628183335 461283 PMW-4 N35° 38' 21.26" W78° 34' 39.14" 35.639239 78.577500 - 5A \
41 ROBUCK HOMES TRIANGLE LLC 17361 668 1628175937 463807 MW-1 N35° 37' 55.48" W78° 35' 22.70" 35.632078 78.589444 .1 r
42 DRIVER, CHRISTOPHER WILLIAM DRIVER,CADY BETH 17550 1902 1628183486 461282 MW-2 N35° 37' 58.85" W78° 35' 28.71" 35.633014 78.591111 F''- , / 48
43 ROBUCK HOMES TRIANGLE LLC 17361 668 1628185076 463804 MW-3 N35° 37'44.98" W78° 35' 00.76" 35.629161 78.583611 rOJ�� EET 6 OF 1
44 ROBUCK HOMES TRIANGLE LLC 17261 1304 1628184527 460374 MW-B-3 N35° 38' 59.28" W78° 34'45.12" 35.649800 78.579200 '.� I
45 HILSMAN, MATTHEWJ HILSMAN,TRACIE L 17549 1098 1628186115 463803 MW-B-8 N35° 37' 52.09" W78° 35' 14.71" 35.631136 78.587500 W_B_g ,B se oo
46 MEREDITH,CARLISLE F MEREDITH,THERESA M 17102 81 1628184679 441937 MW-B-9 N35° 38' 32.64" W78° 35' 17.88" 35.642400 78.588300 1 4B 4A
47 MINES, MATTHEW JAMES MINES, BRITTANY KOUDER 17508 299 1628186244 461285 7A \
48 KURIMSKY, LORI LYNN 17231 785 1628185810 441934 L E G E\ 9 4 / /N
49 TEYNOR,JEREMY LYNN TEYNOR, MICAH 17476 2082 1628186383 461284 M W 4B /
MONITORING WELL 'a�� MW-3 /
50 HIGH, DOUGLAS CARLTON HIGH, RUTH ANN 17208 2181 1628185961 441932 \ \ / /
51 MURRAY, CARMEN RACHEL MURRAY, DANIEL KEITH 17464 1193 1628187421 460376 COMMUNITY IRRIGATION WELL - CIW-1 / \
LAGOON 2
52 PADEN,ANTOINE PADEN, MELANY 17020 302 1628196002 441928 REVIEW BOUNDARY 4e
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53 JENKINS, RODNEYJ CAPORICCIO,ANGIE L 17442 726 1628187550 460375 PROPOSED MONITORING WELL 'ate PMW-3 /
54 BUFFALOE PRESERVE LLC 12998 2411 1629300602 441960 COMMUNITY DRINKING 4A /
G5� CDWW-2 /
55 KYPRIANOU, MICHAEL KYPRIANOU, KASEY LYN 17094 667 1628187599 441938 WATER WELL
56 WILSON, ROGER DEAN WILSON, CHERYLLYNN 16922 2645 1628293801 441897 COMPLIANCE WELL GE-- MW-B-1 /�/ PMW-4
57 PLUMMER,ANGELA AMANCHUKWU PLUMMER,TYROME L 17188 2705 1628188638 441936 USDA SOIL TYPE WeE 4'
58 FELISBERTO, RIGELMA CRUZ 17000 2119 1628294809 441893 USDA SOIL BOUNDARY / O /
59 COLLINS, NICOLE COLLINS, LANCE JOSEPH 17343 2025 1628188767 441935 COMPLIANCE BOUNDARY
60 ARRIETA,JUAN CARRIETA, LAUREN 16931 204 1628294997 441883 jjjj// REVIEW BOUNDARY
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61 GREENSHIELDS, GARY L GREENSHIELDS, MARTHAS 17069 734 1628189806 441931 LAGOON 1 COMPLIANCE BOUNDARY
62 PITT, MICHAELC PITT, HEATHER M 16894 132 1629205096 441881 PROPERTY INFORMATION / 7 1 /78
63 NEWTON, MICHAEL NEWTON,SHARON 17044 1266 1628189935 441929 SHEET 7 OF 11 �- ,/� EET 8 OF 11 � / SHEET 9 OF 11
64 CHATRAW,JOSHUA DAVID CHATRAW,TRACY LYNN 17174 834 1629207269 441880 PROPERTY BOUNDARY
65 HARGROVE,ANTONIO HARGROVE, KIM CASSANDRA 17162 558 1628199092 441926 BUILDING FOOTPRINT / B
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66 MCNABB, RODNEY D MCNABB, MICHELLE K 17014 1840 1628199192 441925 2019 FLOOD PLAIN 3B
67 MITCHELL, CHARLES JR MITCHELL, BERNICE C 17089 965 1628290187 441920
68 BREED, DANIEL NOLAN BREED, KARI LAUREL 16965 213 1628291253 441919 Pv, ' .orrr-r L14E C WW 2 1A /
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69 RULLMAN, KAREN A TRUSTEE THE KAREN A RULLMAN REVOCABLE TRUST 17215 1359 1628292239 441918 �xl� �-rE r Gor•1-roUl�
70 CHANICE, LINDSAY NICOLE 17056 1224 1628293306 441915 k5Ur r- 10, LIMIT -
71 ALLEN, CLINTON LEMON DALLEN ROBIN ANN 17138 1875 1628293472 441914 h-(srrEM DIvISIoI 1 L11-1e �-••••"0" I ell "A 3B / /
72 MCEACHERN, FREDERICK D MCEACHERN,SELMA E 16946 1268 1628294448 441906 /
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73 HAFER,JORDAN SCOTT HAFER,ALISSA PATRICIA 16959 1182 1628295525 441903 r2lv key 101.1 LI►JE /
74 REEVES,JONATHAN E REEVES, KRISTY B 17076 1298 1628295683 441900 Ex1x-irI,JCx TKEE LIrJE ,75 PRIESKORN,SUZAN J PRIESKORN, MICHAEL K 17303 1023 1628297703 441890 Icy`( pIVIhlOi-41 I�� /76 BUFFALOE PRESERVE LLC 12998 2411 1628189108 463829 plhE 4 I t`fI•1CTh m 4+, `� \ 1A
77 BUFFALOE PRESERVE LLC 12998 2411 1628189356 463830
BULL G113GLE hf�1311GKLEts, 0 13A78 CITY OF RALEIGH 17252 75 1628298678 441952 /51
79 HUDEL, CHRISTOPHER BENNETT-HUDEL,JULIE LYNNE 16914 2079 1628298936 441885 �2 GI I�GLE tir'E�1IJKLEr�80 PALMER JOHN EDMUND III 17274 2417 1629300149 441879 I/4 G1rs,GLE Lil'r=,IrJL
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81 HARBAUGH,WILLIAM BRADFORD HARBAUGH, ROBIN CAROL 16968 1621 1629302352 441878 \ /82 CLARK UTILITIES LLC 17129 629 1629300570 441941 /83 OGLETREE, ROBERT PHILIP OGLETREE,JILL HICKOK 16940 1645 1629303499 441876 \84 BUFFALOE PRESERVE LLC 12998 2411 1629302627 441877 111191- / /
85 BUFFALOE PRESERVE, LLC 17046 295 1629305755 441874 SHEET 10 OF 11 F 11 /
86 ROBUCK HOMES TRIANGLE, LLC 16632 2159 1629303891 441873 by pIVlc,lO1J G
87 BUFFALOE PRESERVE LLC 12998 2411 1629318007 441958 M s -B-: /
88 BUFFALOE PRESERVE LLC 12998 2411 1629316059 441875 LICw Iz' 14.] 'E." D;rt cx.kvICE ;;or,D \ /
89 BUFFALOE PRESERVE LLC 12998 2411 1629410216 441944 E tJa r �M .-'-:,CAD TO Sei
90 BUFFALOE PRESERVE LLC 12998 2411 1629413520 441947 1t.- Ro dED -to 12 WIDE (D,�.1 OLLY)
91 BUFFALO(PRESERVE LLC 12998 2411 1629419715 441949 I.lkl 121 wlDe GiEtz,vIGE tAattD A
92 BUFFALOE PRESERVE LLC 12998 2411 1629419919 441961 w/ c0" toNE I' E:
93 COCKS, CHARLES T 15735 2238 1629423149 238848 �X KT1I-06- re.r'M r30dM7 -ro e / 1 /
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94 WAKE CNTY BOARD OF EDUCATION 13290 1118 1629438568 9706 yN fpE ,E /
95 WHITE, MARY POWELL WARD WARD, ISABEL L 1629604691 167076 P 7U�E �TR.AIJ2 &%,a-I.it ,s- ,s, \ i
96 RALEIGH CITY OF 12224 149 1628259668 47931 E1-k E \ ' /
97 KOZACK,WALTER&DIANE 17122 671 1628196153 441927 L-x1 -,TIIJG f3L11LDU4C F.aa3� GENERAL NOTES:
98 LAMBETH,JOSHUA&LAURA 17111 124 1628196294 441923 TO t3E �'EMwED z� \
99 SMOOT, EDWARD BSMOOT,JULIA L 17142 2448 1628197364 441922 Trz,ee 3AG;ti,IEti' 1. SOIL INFORMATION OBTAINED FROM THE USDA WEB SOIL -
100 ADOLPHSEN,JULIE MADOLPHSEN,JOSHUA A 17088 1778 1628198451 441921 GI,f:DI�Ir.IGa LIMIT- �� , ''aP) SURVEY. PARCEL INFORMATION OBTAINED FROM THE COUNTY
101 VELASQUEZ, KELVIN DANIEL VELASQUEZ, PARIS BRIANNA 17000 692 1628199449 441917 �gutiN EYiJz.PsIE9.7 (-° v,e-'ID•'� D�� GIS SYSTEM. BUILDING FOOTPRINT TRACED FROM AERIAL
102 OWENS,STEVEN DARNELLOWENS,ARLENE MARIE 16923 2209 1628290537 441916 IMAGERY,NOT SURVEYED.
2. MW-3 IS WITHIN THE LAND CONDEMNED BY THE STATE OF
103 WELCH,JOSEPH J WELCH,JAMIE L 16986 2326 1628291625 441912 NORTH CAROLINA.
104 SCHOONVELD, KATHLEEN MARY SCHOONVELD,WAYNE EVERTT 16950 1526 1628292713 441909
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DESIGN ENGINEER S. BLACK, PE �.•��ZN �A rO,,4 y,�
CHECKED BY J. LANGSTON, PE +r�t���4ESSIa�9l9 •.�, %lo
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RALEIGH, NC 27601 15370
919.232.6600 • --- e E •�� �„) , Raleigh
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0 1' 2" FILENAME
A 02/24/2021 WRENN ROAD SPRAY IRRIGATION FACILITY REPERMITTING .,.*,,,star OS I t I
FACILITY SITE PLAN SCALE 1" = 100' (ON 24 x 36) 4 of 12
N.C.B.E.L.S. License Number F-0116 ISSUE DATE DESCRIPTION PROJECT NUMBER 10273665

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PROJECT MANAGER C. BROWN, PE “..”4„
Inc. of the Carolinas DESIGN ENGINEER S. BLACK, PE /44,...a7.4.4
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Inc. of the Carolinas PROJECT MANAGER C. BROWN, PE ,_40,.Nn•r,,,"_a �`
DESIGN ENGINEER S. BLACK, PE .ego CARpi� y�. ` 0
CHECKED BY J. LANGSTON, PE +s ���04ESSIQN9�9 •.�, 1#••
1-)1 555 FAYETTEVILLE l
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RALEIGH, NC 27601 15370 :3. Raleigh
919.232.6600 ��J'�Q•yt NE;`••'Q�o�•`•+
••» .• FILENAME SHEET
A 02/24/2021 WRENN ROAD SPRAY IRRIGATION FACILITY REPERMITTING °''�yF `' W R E N N ROAD SPRAY IRRIGATION _ = 2
N.C.B.E.L.S. License Number F-0116
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ISSUE DATE DESCRIPTION PROJECT NUMBER 10273665 FACILITY SITE PLAN

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HDR Engineering, \ ��
Inc. of the Carolinas PROJECT MANAGER C. BROWN, PE �••ZH CARS,,_ 1` //
DESIGN ENGINEER S. BLACK, PE �.•� h��y ,#
CHECKED BY J. LANGSTON, PE +r�����4ESSIa�9l9 •fit .�, ` /
00
555 FAYETTEVILLE •
STREET, SUITE 900 _ DRAWN BY C. GIGLIOTTI, EIT SEAT
RALEIGH, NC 27601 ±� 15370 Raleigh
919.232.6600 •(j F/yr '�-
1.°a°'yfG� E '�•,,�•'' WRENN ROAD SPRAY IRRIGATION _ SHEET
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A 02/24/2021 WRENN ROAD SPRAY IRRIGATION FACILITY REPERMITTING •�.•.►t,,.,..►t�O5 I ,L 1 11 of 12
FACILITY SITE PLAN SCALE 1" = 100' (ON 24 x 36)
N.C.B.E.L.S. License Number F-0116 ISSUE DATE DESCRIPTION PROJECT NUMBER 10273665

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HDR Engineering, \ \/
Inc. of the Carolinas PROJECT MANAGER C. BROWN, PE ,�40,temr,,,,, %
DESIGN ENGINEER S. BLACK, PE ..`�ZH CARpC7.y,� ` 0
CHECKED BY J. LANGSTON, PE +s ���04ESSIQN9.9 •.�, ` / f
919.232.6600 FAYETTEVILLE l
STREET, SUITE 900 DRAWN BY C. GIGLIOTTI, EIT : SEAL
RALEIGH, NC 27601 15370 :3. Raleigh
�J'�•.F� �`•••�o.`��
���'•a°yfG •"E WRENN ROAD SPRAY IRRIGATION _ 2" FILENAME SHEET
A 02/24/2021 WRENN ROAD SPRAY IRRIGATION FACILITY REPERMITTING ••.....
as. l 1.z l FACILITY SITE PLAN SCALE 1" =400' 12 OF 12
N.C.B.E.L.S. License Number F-0116 ISSUE DATE DESCRIPTION PROJECT NUMBER 10273665

5
Groundwater Monitoring Plan
for the Wrenn Road Facility
Wastewater Irrigation System

F
Ground Water
Monitoring Plan
Wrenn Road Facility Wastewater Irrigation
System
Garner, NC
February 26, 2019

February 26, 2019
Mr. Rick Bolich
NC Department of Environmental Quality
Division of Water Resources
Water Quality Regional Operations Section
Raleigh Regional Office
3800 Barrett Drive
Raleigh, NC 27609
Re: Ground Water Monitoring Plan
Permit No.WQ0002708
City of Raleigh Wrenn Road Facility Wastewater Irrigation System
Wake County, North Carolina
Dear Mr. Bolich,
On behalf of the City of Raleigh Public Utilities Department, we are resubmitting the Ground Water
Monitoring Plan requested in the approval for Permit Number WQ0002708 to support background
concentrations of manganese, iron and arsenic above the 15A NCAC 02L standards. The sampling
plan has been prepared with consideration to the guidance material suggested in the Permit
Approval letter: Aquifer Protection Section Policy for metals Determinations Required by Title 15A,
NCAC, Subchapter 2L (May, 2013) and Evaluating Metal in Groundwater at DWQ Permitted
Facilities: A Technical Assistance Document for DWQ Staff(NC DENR, July, 2012). Also, the
following US EPA groundwater monitoring guidance document was utilized: Statistical Analysis of
Groundwater Monitoring Data at RCRA Facilities-Unified Guidance: EPA 530/R-09-007.
Additionally, recommendations offered by DEQ during discussions with the City and HDR were
incorporated into the sampling plan.
In summary, the revised sampling plan will:
1. Install and develop four(4) background monitoring wells at the Wrenn Road Facility;
2. These wells will be sampled for iron, manganese, and arsenic bi-monthly for the first six(6)
months to develop background statistics for compliance monitoring;
3. Determine if 2010 sampling data is from the same population and for use in defining
background statistics for ground water monitoring;
4. Sample the new background wells for one (1)year on the same schedule used for
compliance monitoring to evaluate any time trends to consider in compliance assessments;
5. The new ground water monitoring wells will be maintained such that resampling can be
accomplished in the future if necessary.
hdrinc.com
555 Fayetteville Street Suites 900&210,Raleigh, NC 27601-3034
[phone]

This package contains the following:
Attachment A—The ground water monitoring plan submitted to DEQ on February 28, 2017
Attachment B— Responses to comments provided to DEQ on October 7, 2017
Attachment C—The resubmittal to DEQ by the City/HDR on December 14, 2018, providing
revised background monitoring well locations
Attachment D— Meeting minutes from a meeting held with the City, HDR, Eagle Resources,
and DEQ on January 31, 2019
Attachment E—Water well locations for the subdivision located adjacent to the Wrenn
Road Facility
Attachment F—Ground water well levels
Attachment G —A contour map of the proposed monitoring well locations
The groundwater permit WQ0002708 expires June 30, 2020. The 1-540 project will impact the
Wrenn Road Facility and the compliance boundary. The exact timing of the 1-540 project is
unknown at this time. The City will keep DEQ informed as to the progress of this project.
We have submitted a full package in order to hopefully help the review process. Should you have
any questions, please do not hesitate to call me at 919-232-6657. We look forward to hearing from
the NC Department of Environmental Quality.
Sincerely,
HDR Engineering Inc. of the Carolinas
Chris Brown, PE
Project Manager
Enclosures
CC: Chris Phelps, City of Raleigh
Dennis Lassiter, City of Raleigh
Whit Wheeler, City of Raleigh
Eric Lappala, Eagle Resources
Samantha Black, HDR
Manish Bhandari, HDR
hdrinc.com
555 Fayetteville Street Suites 900&210,Raleigh, NC 27601-3034
[phone]

A
Ground Water Monitoring
Plan — Submitted February
28, 2017

1111)1R
February 28, 2017
Mr. Troy Doby
Non-Discharge Permitting Unit
Water Quality Permitting Section
Division of Water Resources
512 N. Salisbury Street
Raleigh, NC 27604
Re: Ground Water Monitoring Plan
Permit No.WQ0002708
City of Raleigh Wrenn Road Facility Wastewater Irrigation System
Wake County, North Carolina
Dear Mr. Doby,
On behalf of the City of Raleigh Public Utilities Department, we are providing the Ground Water
Monitoring Plan requested in the approval for Permit Number WQ0002708 to support background
concentrations of Manganese, Iron and Arsenic above the 15A NCAC 02L standards. The
sampling plan has been prepared with consideration to the guidance material suggested in the
Permit Approval letter: Aquifer Protection Section Policy for metals Determinations Required by
Title 15A, NCAC, Subchapter 2L (May, 2013) and Evaluating Metal in Groundwater at DWQ
Permitted Facilities: A Technical Assistance Document for DWQ Staff (NC DENR, July, 2012).
Also, the following US EPA groundwater monitoring guidance document was utilized: Statistical
Analysis of Groundwater Monitoring Data at RCRA Facilities-Unified Guidance: EPA 530/R-09-007.
Based on these sources and other groundwater modeling tools a ground water monitoring plan has
been developed. This detailed groundwater monitoring plan is attached, "Proposed Monitoring Plan
to Establish Background Concentration of Iron and Manganese at the Wrenn Road Spray Fields,
Wake County NC" (Plan) by Eric Lappala, P.E., P.H., Eagle Resources.
In summary the sampling plan will:
1. Install and develop five (5) new monitoring wells at the Wrenn Road Facility;
2. These wells will be sampled for Iron, Manganese and Arsenic, bi-monthly for the first six (6) •
months to develop the background statistics for compliance monitoring;
3. Determine if 2010 sampling data is from the same population and for use in defining
background statistics for ground water monitoring;
4. Sample the new background wells for one (1) year on the same schedule used for •
compliance monitoring, to evaluate any time trends to consider in compliance assessments.
5. The new ground water monitoring wells shall be maintained such that resampling can be
accomplished if necessary.
hdrinc.com
3733 National Drive Suite 207,Raleigh NC 27612
T 919.232.6600 F 919.785.1187

Should you have any questions, please do not hesitate to call me at(910) 575-8800.
Sincerely,
HDR Engineering Inc. of the Carolinas
-geL,)7
441A44.t.._
Randy Plummer, PE
Project Manager
RTP
Enclosures
cc: Chris Phelps
Dennis Lassiter
3733 National Drive Suite 207,Raleigh NC 27612
T 919.232.6600 F 919.785.1187

Proposed Monitoring Plan to Establish Background
Concentration of Iron and Manganese at the
Wrenn Road Sprayfields, Wake County, NC
North Carolina Non-Discharge Permit WQ0002708
Prepared for
City of Raleigh Pubic Utilities Department and
HDR Engineering of the Carolinas
April 1, 2016
(Revised February 1, 2017)
• OAS riff
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Eric G. Lappala,P.E.,P.H.
Eagle Resources, P.A.
P.O. Box 11189
Southport, NC
www.eagleresources.corn
1

Contents
Introduction 1
Purpose 1
Model Analyses to select sites for background monitoring 2
Sampling Design 8
1. Identical and Independent Distributions of background and forward samples 8
2. Temporal Stationarity of Samples 10
3. Spatial Stationarity of Samples 10
4. Statistical Outliers 12
5. Use of Parametric Methods 12
6. Minimum Number of Background Samples 12
a) Additional Background Wells 13
b) Sampling to Establish Background 14
c) Initial Sampling Methodology Assessment 14
Recommended Background Determination Methodology 15
Conclusions 16
Figures
Figure 1.-- Measured and modeled water level elevations in B-3,B-8,and B-9 3
Figure 2.-- Modeled concentrations of the modeled constituent in model layer 1 as of 12/31/15. 5
Figure 3.-- Modeled concentrations of the modeled constituent in model layer 2 as of 12/31/15. 6
Figure 4.-- Modeled concentrations of the modeled constituent in model layer 3 as of 12/31/15. 7
Figure 5.-- Probability Plots for(Fe/ 2L standard) and (Mn/ 2L standard) for the 2010 study samples..
9
Figure 6.-- Probability plots of log-transformed values of(Fe 2L Standard) and (Mn/2L Standard) for
the 2010 study samples. 10
Figure 7.-- Log-transformed multiple of Fe (left panel) and Mn (right panel) multiples of the 2L
Standards for samples from the 2010 study. 11
Figure 8.-- Dissolved Fe and Mn plotted against each other showing little correlation between them.... 12
Tables
Table 1.—Dissolved Fe and Mn from the 2010 study,their multiples of the 2L standards and the log
transform of the multiples of the 2L standards. 9
Table 2.-- Coordinates of Proposed Background Monitoring Wells. 13
Table 3.-- Results of purging of compliance wells on February 5,2016 and laboratory analyses for
dissolved Fe and Mn in samples taken at the end of purging 15
i

Introduction
NC DEQ has granted Permit WQ0002708 to the City of Raleigh (City) for the continued operation and
irrigation at the Wrenn Road Facility in southeastern Wake County. This permit is a renewal for the
permit of the same number that was in effect originally to permit the same facilities for the disposal of
wastewater effluent from the treatment facilities. The Wrenn road Facility stopped receiving domestic
wastewater in 2008. The spray irrigation facilities were modified to allow treatment of residuals from
the DE Benton Water Treatment Plant (DEBWTP).WQ0002708 was amended in 2012 for the spray
irrigation modifications and to change the influent waste source to residuals from the DEBWTP. The
spray irrigation permit was renewed in 2015.The sprayfields have been used since 1989 to dispose of
treated wastewater from the Garner wastewater treatment plant (Garner WWTP). The Town of Garner
operated the WR Sprayfields until the merger of the Garner water and sewer utility systems with the
City of Raleigh in July 2000. The City of Raleigh Public Utilities Department(CORPUD) has operated
the Garner wastewater plant and the WR Sprayfields since that date.
A comprehensive Hydrogeologic and Geochemical evaluation of the site was completed by Soil and
Environmental Consultants (S&EC) and Eagle Resources for the site in 2010 and approved by DEQ as
part of the application for the currently issued permit,2,. These studies comprised the installation of
over 20 temporary piezometers,three monitoring wells,and groundwater flow,groundwater transport,
and geochemical modeling to assess both conditions prior to the application of residuals from the WTP
and to recommend loading rates to the sprayfields to assure that the likely depth to the watertable would
be compliant with the conditions of the permit.
Purpose
The permit was issued by DEQ with the condition that the City prepare a monitoring plan to assess the
background concentrations of arsenic,iron and/or manganese above the 15A NCAC .02L groundwater
standards (2L Standards). The 2010 reports documented concentrations of these constituents in samples
collected from piezometers and monitoring wells that exceeded the 2L Standards.The permit condition
also requested that CORPUD consider DWQ Staff guidance documents3,4 in preparing the plan.
These guidance documents include the statistical evaluation of data used to establish background
concentrations to account for spatial variations across complex sites. Because the piezometers from the
2010 studies have been abandoned,they and are no longer available to use for re-development and
sampling to provide this data. The three monitoring wells that have been used for compliance reporting
since the original permit was issued for the site (MW-B3,MW-B8,and MW-B-9) also are not adequate
in number or location to use for the establishment of background concentrations. These wells are not
located in areas where the 2010 study showed concentrations of the regulated metals to be above the 2L
Standards. Additionally,only three rounds of samples have been taken that have included analyses for
the metals of concern since the permit was issued and application of residuals was started in 2014.
The objective of this report is to present a plan for using data and analyses from the 2010 study
documents combined with data from additional monitoring locations to respond to the permit condition
to assess the background concentrations of iron and manganese at the facility.
Soil and Environmental Consultants,2009, Site Analysis for Wrenn Road Wastewater Treatment Plant Spray Irrigation
system, Garner.,Wale County, North Carolina
2 Eagle Resources, P.A., May 10, 2010, Groundwater Mounding Analysis and Groundwater Quality Assessment Wrenn Road
Wastewater Treatment Plan Spray Irrigation System Garner,Wake County, North Carolina
3 NC Division of Water Quality, July 2012: Evaluating Metals in Groundwater at DWQ Permitted Facilities: a Technical
Assistance Document for DWQ Staff.
4 NC Division of Water Quality, May 13, 2013:Aquifer Protection Section Policy for Metals Determinations Required by Title
15A North Carolina Administrative Code, Subchapter 2L.
1

Based upon the DEQ guidance documents,determination of the quality and quantity of background data
needed should consider the following:
1. Physical complexity of the site
a. Does site geology vary horizontally across the site
b. Are off-site wastes likely to migrate to and contaminate background or compliance
boundary wells
c. Have Hydrogeologic anomalies been identified?
d. Have wastes been disposed across particularly large or undocumented areas
e. Spatial extent and complexity of the waste disposal practices
2. Are background concentrations expected to be similar to 2L standards and/or similar to on-site
concentrations at the compliance boundary
3. Will site be used as a precedent for similar sites in the state
4. Will statistical proof be required to justify a non-compliance determination
At a minimum, collected data should measure maximum concentrations of permitted waste constituents
that exist at the compliance boundary and at ambient background locations, along with any spatial or
temporal trends.Moreover, sample numbers and locations should align with statistical data needs....
Therefore, background data should be collected from a hydraulically up gradient location (outside the
influence of site wastes) in immediate proximity to the site and within the same groundwater horizon
(depth/zone) as samples collected from compliance boundary wells. ...."
Model Analyses to select sites for background monitoring
The 2010 studies and analyses provide the documentation of the items listed above that define the
physical complexity of the site. The calibrated groundwater flow and transport model constructed for
those studies was based on site-specific data from borings,piezometers (19) monitoring wells (3),water
levels,tests for hydraulic conductivity,chemical and geochemical analyses of water samples. The
model was constructed using three layers: The Saprolite at the site was modeled as two layers each 17.7
feet thick which are referred to as the Upper Saprolite and Lower Saprolite respectively. The third layer
comprised Partially Weathered Rock (PWR) and was 15 feet thick.
Transient analyses using the model have been used to help identify those areas that are not likely to
have been impacted by migration of constituents in water applied to the Wrenn Road fields during 2014
and 2015. The initial water levels used for the transient analyses with the model were the steady state
values from the calibrated 2010 model which used a natural recharge rate of using a recharge rate of 15
inches per year.Monthly recharge for 2014 and 2015 used for model input was determined as follows:
Recharge on non-sprayfield areas =Precipitation— Evapotranspiration (ET); and (1)
Recharge on spray areas =Precipitation + Applied Effluent —ET. (2)
Precipitation for each month was taken from the grid centered on the site out of the 4km x 4km gridded
values from the National Precipitation Dataset from the PRISM website5. The PRISM datasets are
5 http://www.prism.oregonstate.edu/
2

computed using measurements from a wide range of monitoring networks that cover the conterminous
United States to which sophisticated quality control measures and a variety of modeling techniques are
applied and are available as daily,monthly and yearly time scales for the period from 1895 to the
present.
ET was taken from the global monthly ET 0.05 degree grid corresponding to the site from the MODIS
projects. This project is part of NASA/EOS project to estimate global terrestrial evapotranspiration from
earth land surface by using satellite remote sensing data. The MOD16 ET datasets are estimated using
Mu et al.'s improved ET algorithm(2011) over previous Mu et al.'s paper(2007a).The ET algorithm is
based on the Penman-Monteith equation (Monteith, 1965). Surface resistance is an effective resistance
to evaporation from land surface and transpiration from the plant canopy.
Applied effluent to each field for each month was computed using the volume applied as reported on the
Discharge Monitoring Reports (DMRs) provided by CORPUD and tables provided by HDR of the
percentage of spray heads applying to each soil type within each field that are included as Attachment 1
to this report. Attachment 2 provides a summary tabulation of the monthly effluent applied to each soil
type within each field. The unit rate applied effluent in equation (2) was determined by dividing the
volume applied by the area occupied by each soil within each field.
Modeled water level elevations in B-3,B-8,and B-9 for the period 2014 through 2015 are shown on
Figure 1 along with measured water level elevations for 2007 through 2015 Although water levels
fluctuate,they tend to fluctuate in unison over the site and model analyses show that the pattern of
groundwater flow that are determined by recharge and discharge areas does not change significantly.
•
361.75
331.5
v t B-3
LL
co 301.25 t B-8
co
B-9
z -B-3 Modeled Sy=0.25
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ro
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210.5
I
180.25
150
6/1/06 5/22/075/11/08 5/1/09 4/22/104/12/11 4/1/12 3/22/133/13/14 3/3/15
Figure 1.--Measured and modeled water level elevations in B-3,B-8,and B-9
6 http://www.ntsg.umt.edu/project/mod16
3

Transient transport analyses for 2014 through 2015 were conducted to assess potential migration of
COCs in effluent from DEB WTP and to locate areas where it is not likely to have impacted
groundwater and hence where background monitoring sites should be located. The source term used for
these analyses was an arbitrary constituent at a concentration of 10 arbitrary units applied to the areas
that received effluent during 2014 and 2015.Figures 2 through 4 show the modeled concentrations of
the arbitrary constituent as of December 31,2015 for each of the modeled layers.
4

1
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45
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Project No. Design data and recommendations included herein are provided as a
Jmatter of information and should not be used for final design.Rely only on FIGURE
City of 24041.1 hard copy bearing consultants original seal and signature
■I tat Raleigh Approved: EGL Modeled concentrations in Upper Saprolite of an DRAFT
Eagle Resources,P.A. Public arbitrary solute on 12/31/2015 applied in irrigation
P.O.Box 11189 Utilties water at concentration of 10 arbitrary units for 2014 2
Southport,NC 28461 Date: 02/21/16 and 2015.
919-345-1013 Department
[e-mail]
4

3
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500 0 500 1000 1500 2000 Ft
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Project NO. Design data and recommendations included herein are provided as a
matter of information and should not be used for final design.Rely only on FIGURE
City of 24042.1 hard copy bearing consultants original seal and signature
■ii lae Peoarce, Raleigh Approved: EGL Modeled concentrations in Lower Saprolite of an DRAFT
Eagle Resources,P.A. Public arbitrary solute on 12/31/2015 applied in irrigation
P.O.Box 11189 Utilties water at concentration of 10 arbitrary units for 2014 3
Southport,NC 28461 Date: 02/21/16 and 2015.
919-345-1013 Department
[e-mail]
5

.1
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Project No. matter
data and recommendations included herein are provided as a
matter of information and should not be used for final design.Rely only on FIGURE
1 eagle 15 City of 24041.1 hard copy bearing consultants original seal and signature
Raleigh Approved: EGL Modeled concentrations in Lower Saprolite of an
Eagle Resources, P.A. Public arbitrary solute on 12/31/2015 applied in irrigation DRAFT
P.O. Box 11189 Utilties water at concentration of 10 arbitrary units for 2014 4
Southport, NC 28461 Date: 02/21/16 and 2015.
919-345-1013 Department
[e-mail]
6

Sampling Design
DEQ has determined that the data from the 2010 report should not be used to establish background
values because the wells were not permanent and because their sampling may not have met the currently
recommended sampling methodology for metals. However,because the sample size is relatively large
(n= 21) from that study and to provide a guide to the approximate variability in concentrations of iron
and manganese over the site as an aid to establishing a background monitoring program to meet these
requirements,we have included that data its summary statistics in Table 1 as well as their as multiples
of the 2L standards. Their multiples of the 2L Standards are also shown on Figures 2 through 4 to
illustrate their spatial variability.
The USEPA guidance document7 on groundwater monitoring for compliance purposes which is
referenced in the DEQ guidance document provides the following six requirements for establishing
prediction limits for comparing background and future compliance samples:
1. Background and future sample measurements need to be identically and independently distributed;
2. Sample data do not exhibit temporal non-stationarity in the form of trends,autocorrelation,or other
seasonal or cyclic variation;
3. For inter-well tests (e.g.,up-gradient-to-downgradient comparisons), sample data do not exhibit non-
stationary distributions in the form of significant natural spatial variability;
4. Background data do not include statistical outliers;
5. For parametric prediction limits,background data are normal or can be normalized using a
transformation; and
6. A minimum of 8 background measurements is available; more for non-parametric limits or when
accounting for multiple, simultaneous prediction limit tests.
1. Identical and Independent Distributions of background and forward samples
To assess the likely distributions of these data,probability plots for the multiples of the 2L standards are
shown in Figure 5. Examination of these plots and the value of the skew coefficients in Table 1 show
that the raw data is not normally distributed. However,the the log transform of the multiples of the 2L
standards closely approximate normal distributions as shown by the fit to the straight normal probability
line in Figure 6. Therefore,to meet the requirements 1 and 5 above,all background and forward
compliance samples should be log-transformed. Note that for both Mn and Fe a value of the log
transformed value of 0.0 for the multiple of the standard is equivalent to the 2L Standard (Value/
Standard= 1.0).
U.S. Environmental Protection Agency,March, 2009: Statistical Analysis of Groundwater Monitoring Data at RCRA Facilities-
Unified Guidance: EPA 530/R-09-007, chapter 18, pp 18-4.
8

3 2
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0 50 100 150 200 250 -2
Fe/2L Standard 0 20 40 60 80 100
Mn/2L Standard
Figure 5.--Probability Plots for(Fe/ 2L standard)and(Mn/ 2L standard)for the 2010 study samples..
Study Fe, Mn, Fe x Log Fe Mnx Log Mn
Well No. mg/I mg/I Std x Std Std x Std
M W-1 11.74 1.06 39.13 1.593 21.2 1.326
M W-2 6.37 0.63 21.23 1.327 12.6 1.100
MW-3 12.33 0.04 41.1 1.614 0.8 -0.097
PZ-1 3.83 4.43 12.77 1.106 88.6 1.947
PZ-2 11.69 4.11 38.97 1.591 82.2 1.915
PZ-3 3.02 0.56 10.07 1.003 11.2 1.049
_ PZ-4 26.28 2.16 87.6 1.943 43.2 1.635 _
PZ-5 30.2 3.16 100.67 2.003 63.2 1.801
PZ-6 69.14 3.46 230.47 2.363 69.2 1.840
PZ-7 23.6 0.43 78.67 1.896 8.6 0.934
PZ-8 31.94 0 106.47 2.027 0 n/a
PZ-9 6.92 0.84 23.07 1.363 16.8 1.225
PZ-10 6.96 0.55 23.2 1.365 11 1.041
PZ-11 1.41 0.02 4.7 0.672 0.4 -0.398
PZ-12 10.3 0.25 34.33 1.536 5 0.699
PZ-14 1.52 0.33 5.07 0.705 6.6 0.820
PZ-15 0.68 0.22 2.27 0.356 4.4 0.643
PZ-16 2.39 0.26 7.97 0.901 5.2 0.716
PZ-17 2.29 0.09 7.63 0.883 1.8 0.255
PZ-18 6.16 0.08 20.53 1.312 1.6 0.204
PZ-19 3.14 0.57 10.47 1.020 11.4 1.057
Mean 12.95 1.11 43.16 1.361 22.14 0.986
Median 6.92 0.55 23.07 1.363 11.00 1.045
Variance 260 2 2887 0.268 821 0.439
Std Dev 16.12 1.43 53.73 0.517 28.65 0.662
Skew 2.40 1.45 2.40 0.012 1.45 -0.340
Table 1.-Dissolved Fe and Mn from the 2010 study,their multiples of the 2L standards and the log transform of the multiples of the 2L
standards.
9

2 1.5
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1.5 R2=0.98704 '• R2=0.97568 •
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0.000 0.500 1.000 1.500 2.000 2.500 -0.500 0.000 0.500 1.000 1.500 2.000 2.500
Log(Fe/2L Standard) Log(Mn/2L Standard)
Figure 6.--Probability plots of log-transformed values of(Fe 2L Standard)and(Mn/2L Standard)for the 2010 study samples.
Conformance with requirement 1 for compliance samples will have to be assessed by periodically determining
their log transformed values and plotting their distribution compared to the background distribution.
2. Temporal Stationarity of Samples
Conformance with Requirements 1 and 2 above will require the periodic assessment of time trends in
both background and compliance samples to assess whether such trends are consistent with each being
similarly distributed. The evaluation of the background and compliance samples should be evaluated for
temporal trends using regression and/or analysis of variance. These analyses will not be possible until a
sufficient number of compliance (and background) samples are available.
3. Spatial Stationarity of Samples
Examination of the spatial patterns of the log transformed values from the 2010 for Fe shows that
concentrations of Fe were elevated in the northwest portion of the property and Mn concentrations were
elevated in the northern portion of the property as shown in Figure 7. These patterns are likely the
result of increased weathering and leaching of the soils and saprolite from the uplands at the north end of
the property to the lowlands at the southern part of the property. These patterns are not apparently
correlated with either the presence or absence of application fields or with the modeled concentrations of
the arbitrary constituent shown in Figures 4 through 4.
10

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Figure 7.--Log-transformed multiple of Fe(left panel)and Mn(right panel)multiples of the 2L Standards for samples from the 2010 study.
A similar spatial variability assessment should be made using new background data and compliance data
once a samples have been collected for at least one year on the current compliance schedule.
To further assess the spatial distribution of Fe and Mn,the log-transformed values of their respective
multiples of the 2L standards are plotted against each other for the 2010 study samples in Figure 8.
While there is a general trend in this relationship,the correlation coefficient between them is very low,
indicating a very weak relationship.
11

3.5
R2=0.1431
3 •
•
• •
2.5 •
7-3 2 •
•
• ••
N 1.5 •
(NJ •
•
c 1 •
'EC)
0.5
• •
0 •
•
-0.5 • —
-1
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Log(Fe/2L Standard)
Figure 8.--Dissolved Fe and Mn plotted against each other showing little correlation between them.
4. Statistical Outliers
The EPA guidance document lists two screening tools (Probability and Box Plots) and two formal
outlier tests (Dixon's and Rosner's) to identify statistical outliers8. The probability plots shown in
Figure 6 for the samples from the 2010 study show that there are no apparent outliers for the log-
transformed data for either Fe or Mn. Because samples from multiple time periods are not available for
the 2010 study samples,Box Plots to compare the values are not appropriate. However after a sufficient
number of additional background and compliance samples are available they may be useful in
identifying any outliers. Because there do not appear to be any statistical outliers for either the log-
transformed Fe or Mn data shown in Figure 6,it does not seem appropriate to apply either parameter.
5. Use of Parametric Methods
Using parametric methods to assess compliance with background requires that the background and
compliance data are both drawn from normal distributions or that the data can be transformed to normal
distributions. As shown in Figure 6 both Fe and Mn are log normally distributed and therefore at least
the data from the 2010 study meet this requirement.
6. Minimum Number of Background Samples
The EPA guidance document states that at least 8 samples should be available to establish background
for the use of prediction intervals for compliance assessment9. As few as three background observations
can be used to compute compliance but would result in a very large upper prediction limit for
background and would limit the statistical power of the test.
8 USEPA Unified Guidance document, Chapter 12.
9 USEPA Unified Guidance Document, p. 18-4.
12

Although DEQ has determined as previously stated that the sample analyses from the 2010 study cannot
be used by themselves to establish background,it is our professional opinion that that dataset as well as
samples from the 1990 study can and should be use in conjunction with additional samples to achieve
this objective. As demonstrated in the previous five sections the 2010 dataset is a) larger than the
minimum of 8 required; b) shows that parametric tests for compliance can be used if the data is log-
transformed; c) shows that the spatial variability in Fe and Mn is the result of natural variability and not
the result of past applications to fields; and d) apparently does not contain statistically significant
outliers. The recommended monitoring plan utilizes this information from the 2010 samples in
conjunction with additional background samples to be obtained from new permanent background
monitoring wells.
With the exception of compliance well MW-B3, none of the existing wells on site meet the necessary
criteria to establish background. MW-B 1 is the only well up-gradient of the fields. The remaining
compliance wells (MW-B-8 and MW-B9 and the three other permanent wells remaining on site (MW-1,
MW-2,and MW-3) are down gradient of the fields and therefore do not meet the DEQ criteria for
background wells going forward. However,data from the 2010 study for MW-1,MW-2,and MW-3 can
and should be use as part of the overall dataset used to establish background. The modeling analysis
shown in the previous section showed that there is the potential for Fe and Mn to have migrated in some
concentrations to these wells as the result of applications in 2014 and 2015 and therefore these and
future data from these wells should be excluded from the background analysis.
Because Fe and Mn were not required compliance parameters prior to the issuance of the current permit,
there is no data from the three compliance wells prior to 2015 for these parameters that could be used to
establish background.
a) Additional Background Wells
This plan recommends the installation and sampling of new wells at five (5) sites and sampled twice at 6
month intervals be used to establish background concentrations for iron and manganese. These sites
were selected based upon the transient model analyses discussed above the are shown on Figures 2
through 4 and were chosen to meet the criteria listed in the DEQ and EPA guidance. The coordinates of
these sites are shown in Table 2 below.
Well No Easting Northing
P-MW-1 2126155 691193
P-MW-2 2124156 688177
P-MW-3 2123614 686726
P-MW-4 2125044 688180
P-MW-5 2126427 689422
Table 2.--Coordinates of Proposed Background Monitoring Wells.
Type 1 monitoring wells should be constructed at these sites that are screened from the depth of the
seasonal high water permanent watertable to the top of PWR. Based upon the 2009 S&EC
hydrogeologic report for the site the new wells will be approximately 25 feet deep and have ten (10) feet
of well screen. The preferred well construction method should be sonic or air rotary drilling to
eliminate blinding off of the formation by drilling muds with hydraulic rotary or smearing of the
formation by hollow stem auger methods.
13

The wells are to be constructed using new threaded 2-inch diameter PVC casing and wire-wound screen
with a number 10 (0.01 inch) opening.The wells are to be completed with a graded sand pack installed
in the annulus between the well screen and borehole wall from the bottom of the boring to two feet
above the top of the screened interval. A bentonite seal at least 1 foot thick is to be placed on top of the
sand pack and a concrete seal placed above it to the land surface. The wells are to be completed with
above-ground,lockable,protective metal well casings.
The new background wells should be developed using industry standard procedures as documented in
the DEQ guidance document. Pumping,surging,and bailing should be used in an effort to develop the
sand pack used so as to minimize the potential for fine sediment to enter the wells during the sampling
events.Development should continue until the produced water is visibly clear and preferably has a
turbidity of 10 NTU or less or the turbidity levels are stable (three consecutive turbidity measurements
do not vary by more than 10%).
b) Sampling to Establish Background
The newly constructed background wells and the three compliance wells should be sampled on a bi-
monthly basis for the first six months following their installation to develop an adequate sample
population for background assessment.Thereafter,these wells should be sampled on the same schedule
used for the existing three compliance wells (March,July,and November) for one year to assess any
longer term time trends.Low flow purging and sampling of all wells should be used to conform with the
DEQ guidance document0. Low flow well purging should continue until turbidity levels are less than
10 NTU or vary no more than 10% and field measured pH and water temperature are similarly stable.
c) Initial Sampling Methodology Assessment
An initial evaluation of low-flow purging and sampling was conducted of the three existing compliance
wells (MW-B-3,MW-B-8,and MW-B9) on February 5,2016 by CORPUD staff using procedures
recommended by Eagle Resources to assess the ability to implement the procedures for obtaining valid
metal samples recommended by DEQ. Low flow well purging was conducted for approximately 30
minutes with pH,temperature and turbidity measurements made at approximately 7 minute intervals.
The wells were purged with the dedicated bladder pumps installed in each well controlled with a
GeoControl Pro system which filled the bladder for 20 seconds and discharged for 10 seconds,resulting
in a flow rate of 0.375 gallons per minute.The field measurements for this purging event are shown in
Table 3.
Water samples were taken at the end of the purging in pre-acidified sample containers supplied by the CORPUD
laboratory and the results of these analyses are shown in Table 3. It is apparent that the DEQ requirements for
low flow purging and sampling can be implemented for the compliance wells. While the turbidity in well MW-
B9 was slightly greater than 10 NTU,subsequent measurements were stable within 10% of the initial value.
10 NC Division of Water Quality, May 13,2013:Aquifer Protection Section Policy for Metals Determinations Required by Title
15A North Carolina Administrative Code, Subchapter 2L.
14

Elapsed Time, Min
1 8 16 23
Purge Volume Gal 0.38 3.00 6.00 8.63
pH 4.81 4.55 4.57 4.59
Temp Deg C 15.20 15.6 15.8 15.80
NTU 0.20 1.30 1.35 0.95
MW-B-3
Dissolved Fe (mg/I) 0.111
Dissolved Mn (mg/I) < .05
Conductivity (umhos/cm) 43.4
pH 4.80 4.74 4.83 4.79
Temp Deg C 14.80 15.1 15.1 15.10
NTU 2.43 2.00 1.48 1.86
MW-B-8
Dissolved Fe (mg/I) 0.109
Dissolved Mn (mg/I) 0.148
Conductivity (umhos/cm) 189
pH 5.61 5.15 5.06 4.97
Temp Deg C 14.20 13.8 13.9 13.90
NTU 14.90 13.40 13.10 13.30
MW-B-9
Dissolved Fe (mg/I) 0.57
Dissolved Mn (mg/I) < .05
Conductivity (umhos/cm) 64.2
Table 3.--Results of purging of compliance wells on February 5,2016 and laboratory analyses for dissolved Fe and Mn in samples taken
at the end of purging..
Recommended Background Determination Methodology
The following steps are recommended to implement the determination of background concentrations of
As,Fe, and Mn at the Wrenn Road Site:
1. Install and develop the five (5) new background monitoring wells as recommended herein;
2. Sample the background and compliance wells bi-monthly for six (6) months following the
installation and development of the new wells. The sampling should follow the recommended
low-flow purging,and field analysis for pH,Conductivity,Turbidity, and Temperature. Samples
taken should be analyzed in the CORPUD laboratory for As,Fe and Mn This will provide a
background sample size of 15 (5 wells x 3 samples) for each constituent. One duplicate should
be taken from one of the background wells that is randomly selected for each sampling round;
3. Prepare probability plots of the 15 sample results for each constituent using the log transform of
the raw values; and visually compare to the plots for the 2010 samples;
4. Conduct One-way Analysis of Variance (ANOVA) on the log-transformed values to assess
whether the new background results are from the same population as the 2010 samples;
5. If the ANOVA shows that the new and 2010 samples are from the same population,pool both to
15

define the background statistics to use in compliance monitoring; or
6. If the ANOVA shows that the new and 2010 samples are not from the same population,use only
the new samples to define the background statistics to use in compliance monitoring; and
7. Sample the new background wells for one year on the same schedule used for the compliance
wells (March,July,and November) to evaluate any time trends in As,Fe,Mn to consider in
compliance assessments. Log transformation should be applied to all these data.
Conclusions
A recommended methodology for establishing the background statistics for the concentrations of
Arsenic (As) Iron (Fe) and Manganese (Mn) in groundwater at the Wrenn Road facility that can be used
in assessing compliance in the three compliance wells monitored at the site under the currently issued
permit WQ0002708. This methodology was prepared in response to a condition of the issuance of the
permit by NC DEQ.
Information on As,Fe,and Mn concentrations is available from the 2010 study at the site that was
collected before application of residual effluent from the Dempsey E.Benton Water Treatment Plant
began in 2014 under the permit. However,the wells used to collect these samples were temporary and
could not be re-sampled and the sample purging and collection methods used for that study were not
necessarily conformant with DEQ guidance for metals evaluation that was published in 2012 and 2013.
Consequently,additional background wells are recommended to be installed to supplement the 2010
data.
Five additional background wells are recommended at sites where modeling analyses conducted as part
of this plan showed that concentrations of mobile constituents contained in effluent applied in 2014 and
2015 were not likely to have reached.
The plan recommends sampling the new wells bi-monthly for six months to provide an adequate sample
size for assessing background concentrations of As,Fe,and Mn. To assess the additional value
provided by also considering the results from the 2010 study, statistical evaluations are recommended to
ascertain if data from the new wells is from the same population as that from the 2010 study. If so,all
the data should be pooled to provide a more robust sample size to establish the distributions and
statistics to use in compliance assessment. If these tests show that the new and 2010 data are not from
the same population only the new data should be used. This assessment concluded that to enable the use
of parametric tests for compliance that the raw As,Fe,and Mn concentrations should be log-
transformed.
To assess any time trends in background values of As,Fe,and Mn it is recommended that the
background wells be sampled for one year on the same schedule used for the compliance wells. The
background wells should be maintained in such as a condition that they can be resampled following this
period if necessary.
16

B
Responses to DEQ
Comments — Provided
October 7, 2017

ii 54e l'eoarGe5
Rick Bolich, L.G.
Assistant Supervisor
N.C. Dept. of Environmental Quality
Division of Water Resources
Water Quality Regional Operations Section
Raleigh Regional Office
3800 Barrett Drive
Raleigh,NC 27609
[e-mail]
October 7, 2017
Subject: Groundwater Monitoring Plan for City of Raleigh Wrenn Road Facility Permit WQ0002708.
Dear Rick;
This letter responds to your email dated May 2, 2017 to Chris Brown of HDR regarding the location of
proposed new monitoring wells to establish ambient concentrations of iron and manganese in
groundwater at the Wrenn Road Facility. Our response to the issues you provided in that email are
attached.
Please contact us if you need any further information on this matter. We are available to meet with you
if necessary to discuss any additional information that you may need to approve the monitoring plan.
Sincerely yours,
6fid
Eric G. Lappala, P.E., P.H.
Attachment:
Response to additional information request
Eagle Resources, P.A.
215 West Moore Street Southport, NC 28461
919-345-1013 www.eagleresources.com

Lae I c rce
Comment:
The proposed background wells P-MW-1 and P-MW-5 appear to be in a topographically upgradient areas that
would be good locations for background assessment of groundwater conditions.
P-MW-2, P-MW-3. and P-MW-4 are not in locations suited to be background locations. They may be suitable
monitoring stations for site conditions affected by lagoon and spray field activities, but these locations are not
representative of background concentrations as they appear to be hydraulically downgradient of the waste
application areas. DWR recommends moving these two wells to a location that is unlikely to be impacted by
waste application.
Response:
The groundwater flow and transport modeling performed for this site demonstrate that all wells chosen to establish
background conditions, including P-MW-2, P-MW-3, and P-MW-4, are unlikely to have been impacted by the
application of water treatment residuals, even if they are within the boundaries of the facility. The objective of the
proposed monitoring plan is to establish statistically significant ambient background conditions that include any
contribution from applied wastewater effluent during that period.
The site was used previously by the Town of Garner and operated by the City of Raleigh to dispose of treated
wastewater effluent from 1989 through 2008 under permit WQ0002708 (Permit).
• Sampling and analysis for iron and manganese in groundwater was not required under that permit.
• The Eagle Resources 2010 study used to support the modification of the Permit detected elevated
concentrations of iron and manganese in temporary monitoring wells that were located within and down
gradient of fields that had been used for wastewater effluent from 1989 to 2008.
• Therefore, any concentrations of these constituents that are currently in groundwater are the result of both
their natural occurrence and any concentrations that may have been present in the wastewater effluent applied
under the permit from 1989 through 2008.
The application of water treatment residuals from the Dempsey E.Benton Water Treatment Plant under the amended
permit that was issued in 2012 began in 2014. The three-dimensional groundwater flow and transport model used in
the 2010 report was updated and used to assess the likely extent of migration of iron and manganese may have
occurred as the result of the application of water treatment residuals.
As documented in the 2010 report the migration of both iron and manganese in groundwater is influenced by the
complex geochemical interaction of these constituents with the soils, saprolite and weathered bedrock that underlie
the site. These interactions all act to attenuate the migration of iron and manganese relative to the migration of
groundwater via a variety of sorption processes. However,to provide the likely maximum extent of their migration
from the application of water treatment residuals, the updated model did not include any of these attenuation
processes.
The DEQ guidance document on establishing ambient background also requires that a statistically valid data set be
present that accounts for the spatial variability hydrogeologic conditions as well concentrations of the regulated
constituents that were present prior to the application of water treatment residuals. Because of the size and
complexity of the Wrenn Road site,it therefore is necessary to include monitoring sites that are within the boundaries
of the site and that may be apparently hydraulically down gradient of some application fields but that have not been
impacted by the application of water treatment residuals.
2

All the proposed monitoring wells locations were selected to meet above criteria. Locating additional wells only at
topographically up-gradient locations of all fields will not meet the requirement to account for this spatial variability
and account for presence of iron and manganese interior to the site that were detected in samples taken for the 2010
report that may have included a contribution from the application of wastewater effluent prior to 2008. Therefore,
we believe that it is scientifically appropriate to install monitoring wells at the proposed locations in order to establish
background conditions.
Comment:
Please use caution if you intend to use groundwater quality data from the 2010 Eagle Resources study and report
to establish background metals concentrations as some of the wells in this study had turbidity in excess of the
levels recommended in the NCDEQ July 2012 "Evaluating Metals in Groundwater at DWQ Permitted Facilities:
A Technical Assistance Document for DWQ Staff"as mentioned in previous correspondence. Please also note
filtered samples are not acceptable for use in establishing metals concentrations at permitted facilities in
accordance with the May 13, 2013 policy memo by Jay Zimmerman, "Aquifer Protection Section Policy for Metals
Determinations Required by Title 15A, North Carolina Administrative Code, Subchapter 2L".
Response:
We intend to use only data that we deem in our professional opinion to be representative of background
conditions.
Comment:
DWR also recommends that any new compliance monitoring wells used to monitor potential impacts from waste
applications be placed at the review or compliance boundary.
Response:
We will consult with DWR on the location of any new compliance wells if they become necessary.
3

C
Ground Water Monitoring
Plan Resubmittal — Submitted
on December 14, 2018

Transmittal
Date: Friday, December 14,2018
Project: City of Raleigh Wrenn Road Facility
To: Rick Bolich, L.G., DEQ
From: Chris Brown, PE, HDR
Subject: Groundwater Permit
We are sending you: ❑Z Attached ❑ Under separate cover via the following items:
❑ Shop drawings ❑ Prints ❑ Plans
❑ Samples ❑ Specifications ❑ Copy of letter
❑ Change Order ❑ Other:
Copies Date No. Description
1 Dec 13 2018 Letter from Eagle Resources—Relocated Wells
These are transmitted as checked below:
❑X For your approval ❑ Approved as submitted ❑ Resubmit
❑X For your use ❑ Approved as noted ❑ Submit
❑X As requested ❑ Returned for corrections ❑ Return
❑X For review/comment ❑ Other:
❑ For bids due ❑ Prints returned after loan to us
Remarks: Mr. Bolich—
HDR Engineering, Inc.of the Carolinas(HDR)is pleased to provide DEQ with the above item. This is
a follow up to comments received at our Oct 2017 meeting. The team has been working with the
adjacent land owner on acquisition of property.
We would like to meet in Jan 2019 to discuss a path forward.
Please let us know if you have any questions.
Copy to: Dennis Lassiter, Chris Phelps,Whit Signed: Chris Brown 919.677.9350
Wheeler,Jesse Walker,Tracy McLamb- [e-mail]
City of Raleigh; Eric Lappala, Eagle
Resources;Samantha Black, Manish
Bhandari- HDR
555 Fayetteville Street,Suite 900,Raleigh,NC 27601 hdrinc.com
[phone]

taie IC.eoarS
Rick Bolich, L.G.
Assistant Supervisor
N.C. Dept. of Environmental Quality
Division of Water Resources
Water Quality Regional Operations Section
Raleigh Regional Office
3800 Barrett Drive
Raleigh,NC 27609
[e-mail]
December 13, 2018
Subject: Groundwater Monitoring Plan for City of Raleigh Wrenn Road Facility Permit WQ0002708
Dear Rick,
This letter transmits the revised locations of the four(4)proposed background monitoring wells for the
subject facility that are shown on the attached map. Wells PMW-2 and PMW-3 will be installed on
property recently acquired by the City of Raleigh. Well PMW-3 is to be accessed for installation from
the adjacent subdivision which has provided permission for same. The location of PMW-1 has not
changed from the original monitoring plan We have moved the location of PMW-4 to the location
shown on the attached map to provide better access for drilling equipment.
We are available at your convenience to meet to discuss the monitoring plan and these locations if it is
necessary.
Sincerely yours,
•
6<,-\x,.°eft rj r o ,,.
;,,r 0LA??.\`R,
Eric G. Lappala, P.E., P.H.
Attachments: Proposed monitoring well location map
Eagle Resources, P.A.
215 West Moore Street Southport, NC 28461
919-345-1013 www.eagleresources.com

, ! /
EXPLANATION
Q Proposed Background Monitoring Wells
Property Boundaries (Wake County GIS)
Well No. Easting Northing
PMW-1 2126151.11 691215.39 PMW-2
,' PMW-4 2125522.18 687848.49
PMW-2 2124505.08 691694.17
PMW-3 2121970.6 688486.31
\IIIIPP ,� 44,K Zy PMW-1
rif
i
$14 * * .
LI I 119,4. I 11144N It*. 1&*41144..4.‘*
i
--*1174`k liir.t*Ait
*it * ,.
PMW-3
I**
fi
, PMW-4
1
, 1\\:\
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Th
ri
500 0 500 1000 1500 2000 Ft
ProjecDesign data and recommendations included herein are provided as a ��101Mili7i
City of 24041.1 matter of hard copy beainformation
ing consulltants original seal and signature be used for final eign.Rely only on �d®� 9 'PA
1491.h. FIGURE
Raleigh `
1 talkl�'esta,�►-ce5 g 7 � P�e9r
Approved: EGL Location of proposed background moniitoring wells = i
21Ea51West Moore Street e Resources,P.A. Public y. t\. 4.• .'
Wrenn Road Facilt 1 m 1
Southport,NC 28461 Utl�tleS F-,s;®,, 'lyvt<.S.\e-
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919- [e-mail] Department Date. 11/28/18 -,r�,�1$ A�g��.\\

I)
Minutes from Resubmittal
Discussion Meeting —
Meeting Held on January 31 ,
2019

Meeting Minutes
Project: City of Raleigh —Wrenn Road Facility Ground Water Monitoring Plan
Subject: Meeting with City and DEQ
Date: Thursday, January 31, 2019
Location: DEQ Offices, 3800 Barrett Drive
Attendees: Chris Phelps—City of Raleigh Samantha Black— HDR
Rick Bolich — DEQ Manish Bhandari — HDR
Brion Byers— DEQ Chris Brown — HDR
Eric Lappala — Eagle Resources
Goal of the Meeting
The goal of this meeting was to gain verbal approval of the Wrenn Road Facility Ground Water
Monitoring Plan so the City may proceed to the implementation and monitoring phase. An
additional goal was to make DEQ aware of changes that may come to the existing Wrenn Road
Facility following the future expansion of Interstate-540 (1-540).
History of the Wrenn Road Facilties Ground Water Monitoring Plan
A brief history of the Wrenn Road Facility Ground Water Monitoring Plan was provided during
the meeting as follows:
• The current permit (WQ0002708) was issued in 2015, and allowed the continued
operation of the Wrenn Road Facility. Part of this permit was the requirement that the
City monitor ground water wells for manganese, iron, and arsenic.
• In February 2017, a revised monitoring plan was submitted to DEQ.
• In May 2017, comments on the revised plan were received by DEQ.
• In October 2017, the City/HDR provided responses to DEQ comments, and a meeting
was held with the City, DEQ, and HDR to discuss these responses. Changes to some of
the background wells were requested by DEQ during this meeting.
• In 2018, the City obtained a parcel of land adjacent to the Wrenn Road Facility. This
parcel provided options for locating background wells. This parcel will provide easier
access to monitoring well #3.
• In December 2018, revised background well locations were submitted to DEQ for review.
These locations were selected based on fieldwork conducted by Eagle Resources and
the well driller. Two well locations were added to the west of the Wrenn Road Facility.

Revised Well Locations
There are four proposed monitoring wells (PMWs). PMW-4 was relocated to avoid a drilling
access issue, and it is now on the access road. DEQ is interested in the ground water flow
directions for PMW-4, and requested a 5-ft contour map of this site. Additionally, a water table
map and water levels were requested.
Wells will be drilled into partially weathered rock, and are not considered bedrock wells. It is
estimated that the depth of these wells will be less than 50 feet. The nearby subdivision ground
water well might influence PMWs if they are to be drilled into partially weathered rock. It was
suggested that a monitoring device be put in to observe the diurnal influence of the subdivision
well. The partially weathered rock is a relatively high permeability, and there is no significant
change in water level based on a recent study. The screening level of the PMWs will be from
the bottom, across the water table.
Impacts of 1-540 to the Wrenn Road Facility
In the future, 1-540 will be expanded on a portion of the Wrenn Road Facility. It is expected that
this expansion will result in the abandonment of at least one MW, consumed 15 to 16 acres of
irrigation land, and change the compliance boundary. The 1-540 design-build project is in the
early stage of design, and it is anticipated that it will be one year until the design is complete. A
conceptual drawing of where 1-540 will be located was provided in the agenda. The City will deal
with the changes caused by the 1-540 expansion project when the design is closer to
completion. The PMWs will not be impacted by 1-540.
It may be beneficial to submit the ground water monitoring plan once changes from the 1-540
project are established since construction will impact the water table. However, the City will
need to submit a permit modification after the new compliance boundary is established.
Alternatively, having a plan in place prior to 1-540 construction may be beneficial as well to get
background data collected before construction for comparison purposes.
The City plans to wait to abandon wells impacted by 1-540 until they can no longer use
associated the spray irrigation area. Although 15 to 16 acres of land will be lost due to the 1-540
expansion, the City currently has excess capacity. However, the permit will still need to be
modified to reflect the new capacity.
Action Items and Next Steps
• HDR/Eagle Resources to provide existing subdivision water well locations, ground water
well levels, well depth, and a contour map to DEQ.
• DEQ will review information and generate a ground water flow map.
• HDR to resubmit the revised Wrenn Road Facility Ground Water Monitoring Plan to DEQ
for review.
These minutes were prepared by Samantha Black with HDR> Please provide comments within
5 days of receipt to [e-mail] or 919-232-6638.

E
Water Well Locations for
Subdivision Adjacent to the
Wrenn Road Facility

Appendix E — Water Well Locations for
Subdivision Adjacent to the Wrenn Road Facility
HDR has identified three wells located within the Glen Creek Community:
1. Well 1: One drinking water well is completely developed, and is located on the north side
of the community (Figures 1 and 2).
2. Well 2: A second drinking water well has been drilled, but is not currently in use, and is
located the south side of the community (Figures 3 and 4).
3. Well 3: The third well is an irrigation well, which supplies irrigation water to the
community (Figures 5 and 6).
Table 1 provides a summary of these community wells, and the following figures show
photographs of wells and their locations relative to the closest proposed monitoring wells
(PMWs).
Table 1. Glen Creek Community Wells
Well Use Latitude, Longitude Closest PMW
1 Drinking Water 35.6466, -78.5855 PMW-2
2 Drinking Water 35.6363, -78.5937 PMW-3
3 Irrigation Water 35.6503, -78.5803 PMW-2
a f i
, ._ .. - ..m.,. _ . at' iv,f,it J,.i.,,r.n
Figure 1. Existing Drinking Water Well Located on the North Side of the Glen Creek Community
1

MEI
Well No. Easting Northing
PMW-1 2126151.11 691215.39 PMW-7
I PMW-4 2125522.18 687848.49
I PMW-2 2124505.08 691694.17
I PMW-3 2121970.6 688486.31
,,-Z i e
...
..
Approximate 3
//
location of C
existing / �,
drinking
water well
Figure 2. Existing Drinking Water Well Location Relative to PMW-2
4• d f ,,4
. "me t�a ".'` '-' :p `xFF� ; Y
"- e x
S,
" r , .4- = . ' 'LW. POOLE WELL& PUMP CO.
,�_ fs ' . ' 9 BOX 1958 WENDELL,N.C. 27591
fy•^� �r ' r { e ♦ 919-266-9223
- 1 * 4 , # CERTIFICATION #J
P! � OAT F7.
. 1 , . E COMPLETED: DEPTH:
`F°'„„-,= �� " � c CASING DEPTH: 1N.
h � � � 4� .�: ,ET. DIAMEiER:�� r�
Z ,s j STATIC WATFq LEVEL— — UAiE:�' ri
are''''',?:
P ... .+.. v; IELC:—� GPM J
Figure 3. Future Drinking Water Well Located on the South Side of the Glen Creek Community
` •Zi PMW-3
y1Y
re
. 1,
% Y
•
Approximate
location of
future drinking
water well
— AlaAlk
Figure 4. Future Drinking Water Well Location Relative to PMW-3
2

,. . I
� �:, r -. r. ��� *-" � 'a` �'�q,. � r
'1'#�+f.• 1 ' .,y,!�_ •r. ' - .) Ili i
�Fii�g�ure 5. Existing Irrigation Well Located on the North Side of the Glen Creek Community
Ippv ---mmitAIR41...
Approximate
location of /
irrigation well
PMW-2.011111111
Ads
Figure 6. Irrigation Well Location Relative to PMW-2
3

Ground Water Well Levels

City of Raleigh Ground Water Monitoring Plan
Wrenn Road Facility
Ground Water Well Levels
B-3 MP Elev 346.00 B-8 MP Elev 226.46 B-9 MP Elev 247.94
Date DTW WL EL Date DTW WL EL Date DTW WL EL
3/9/2017 19.70 326.30 42803.00 20.50 205.96 42803.00 11.20 236.74
7/5/2017 20.60 325.40 42921 .00 21.10 205.36 42929.00 12.10 235.84
11/7/2017 22.80 323.20 43046.00 23.60 202.86 42937.00 12.30 235.64
3/8/2018 22.00 324.00 43167.00 22.30 204.16 43046.00 12.20 235.74
7/5/2018 22.40 323.60 43286.00 23.00 203.46 43167.00 11.40 236.54
7/12/2018 22.60 323.40 43293.00 23.20 203.26 43286.00 12.60 235.34
11/8/2018 21.50 324.50 43412.00 22.70 203.76 43293.00 12.50 235.44

Contour Map of Proposed
Monitoring Well Locations

\340�
EXPLANATION �. 335
0 Compliance Wells and July 2018 Water Level 330
Q Background Wells
, . ..
Property Boundaries (Wake County GIS) ' •
Land Surface Elevation 3s
Modeled Steady State Watertable 2014 PMW-2 N
SiMW-B-3
Well No. Water Table Elev r 40' 323.4.,.
MW-B-9 235.34 MW-
PMW-1
MW-B-8 203.26
P
MW-B-3 323.4 !, 0 , ;.
37s- a
3,0
305
jif
Lo
cr
0 , - -------
S. MW-B-9
,-235.34
ii - - e°,. — '
290
°:
��h
_ PMW-3
o
0
\ 0
s PMW-4,
in
co
Col
t� ,/, `,
N
2So <0
cli 4 ,° .
- V 4 ,1
41- , \- .,'1' ,,, IiIii \\ ,'- ,
\N '------.2,,.._.\76\ ) '.--------------- (1))
j f* ' wr .frAelt ND
76,
' 44 I
220 in
. ,
500 0 500 1000 1500 2000 Ft
,_,
_n
„.. .:. ._ .\._.. . _ - 1 1 , / \ �\ . ..- _,, �.-/ �.
Project No. Design data and recommendations included herein are provided as a
City
matter of information and should not be used for final design.Rely only on FIGURE
Y of 24041.1 hard copy bearing consultants original seal and signature
J Gae Pesrces Raleigh Proposed background moniitoringwells, existing
Resources, P.A. Public Approved: EGL p g
215 West Moore Street compliance wells, topography, modeled steady state 1
Southport, NC 28461 UtlltleS watertable elevations, and measured water level
e
919-345-1013 Department Date: 02/02/19
[e-mail] p elevations in July 2018, Wrenn Road Facilty

This page intentionally left blank

HDR Engineering, Inc. of the Carolinas
555 Fayetteville Street
Suite 900
Raleigh, North Carolina, 27601
919-232-6600
NCBELS Number F-0116
hdrinc.com
© 2019 HDR, Inc., all rights reserved

6
Sampling and Data Analysis
for Background
Concentrations of As, Fe,
and Mn in Groundwater

4alle Peurce.5
Sampling and Data Analysis for Background Concentrations of
As, Fe, and Mn in Groundwater
Wrenn Road Wastewater Treatment Facility, Garner, NC
Prepared for:
HDR Engineering, Inc. of the Carolinas
and
City of Raleigh Public Utilities Department
March 18, 2021
r e
hw
E)w ,'- �pJu
Eric G. Lappala, P.E.
Eagle Resources, P.A
215 West Moore Street
Southport, NC 28461
919-345-1013
www.eagleresources.com
1

Table of Contents
1
Introduction 1
Installation of new Background Monitoring Wells 1
Sampling of Background and Compliance Wells 3
Data Analysis 4
Probability Plots 4
Analysis of Variance 8
Pooling of new samples and the 2010 samples 11
Time Trends 12
Conclusions 16
Attachment 1 Approved Background Sampling Program 17
Attachment 2 Sampling Reports from CORPUD 18
Figures
Figure 1.-- Location of compliance and background wells and wells and piezometers sampled for the
2010 report 2
Figure 2.-- Cumulative probability plots for the log-transformed concentrations of Fe for background
samples and 2010 report unfiltered samples. 5
Figure 3.-- Cumulative probability plots for concentrations of Fe for background samples and 2010
report filtered samples. 5
Figure 4.-- Cumulative probability plots for concentrations of Fe in compliance wells and new
background wells 6
Figure 5.-- Cumulative probability plots for concentrations of Mn for background samples and 2010
report filtered samples. 6
Figure 6.-- Cumulative probability plots for concentrations of Mn for background samples and 2010
report filtered samples. 7
Figure 7.-- Cumulative probability plots for concentrations of Mn from compliance and new background
wells 8
Figure 8.-- Time trend in Fe and Mn in compliance sell MW-B3. 12
Figure 9.-- Time trend in Fe and Mn in compliance sell MW-B9. 13
Figure 10.-- Time trend in Fe and Mn in new background well PMW-3. 14
Figure 11.-- Time trend in Fe and Mn in new background well PMW-4. 15

eaie Pexirces
Tables
Table 1.-- Results of laboratory analyses for As, Fe, and Mn from the background and compliance wells
sampled in 2019 and 2020. 3
Table 2.-- Results of laboratory analyses for As, Fe, and Mn from wells and piezometers reported in the
2010 report 4
Table 3.-- One-way ANOVA comparing the 2020 background values for Fe to the values for unfiltered
samples from 2010. 8
Table 4.-- One-way ANOVA comparing the 2020 background values for Fe to the values for filtered
samples from 2010. 9
Table 5.-- One-way ANOVA comparing the 2020 background values for Fe from the compliance wells
and the new background wells. 9
Table 6.-- One-way ANOVA comparing the 2020 background values for Mn to the values for unfiltered
samples from 2010. 10
Table 7.-- One-way ANOVA comparing the 2020 background values for Mn from the compliance wells
and the new background wells. 10
Table 8.-- One-way ANOVA comparing the values for Mn from the compliance wells vs. the new
background wells 11
Table 9.-- Regression analysis for the significance of the slope of the regression line for Fe in MW-B3.
12
Table 10.-- Regression analysis for the significance of the slope of the regression line for Fe in MW-B9.
13
Table 11.-- Regression analysis for the significance of the slope of the regression line for Fe in PMW-3.
14
Table 12.-- Regression analysis for the significance of the slope of the regression line for Fe in PMW-4.
15
ii

eaie Pextrces
Introduction
This report documents the methodology recommended in the approved monitoring plan', any changes to
that methodology and the reasons for same to determine the statistically valid background concentrations
of Fe and Mn at the Wrenn Road Site. The methodology is summarized as follows:
• Install new monitoring wells to assess concentrations of As, Fe and Mn that are hydraulically up
gradient or cross gradient from any field area to which treated effluent has been or may be applied.
• Sample the new wells and the three existing compliance wells (MW-B3, MW-B8m and MW-B9)
bi-monthly for one year using the purging and turbidity testing protocol specified in the approved
plan to reduce or eliminate high-turbidity samples (background samples).
• Compare the laboratory-determined concentrations of the three constituents background samples
with the ones from samples collected from monitoring wells and temporary piezometers as
reported in the 2010 site investigation report2 to answer the following questions:
1. Are concentrations of the three constituents from the background samples statistically same as
those in Table 8 of the 2010 report(unfiltered samples)?
2. Are the filtered sample concentrations of the three constituents in Table 9 of the 2010 report
statistically the same as those from the background samples?
3. Are concentrations of the three constituents from the background samples from the new wells
from the same population as those from the three compliance wells?
• Based upon the answers to these questions, recommend a site-specific background concentration
for all three constituents that is either the existing NC 2L groundwater standard or a higher
concentration if data from the background samples is statistically greater than the standard.
Installation of new Background Monitoring Wells
The monitoring plan called for the installation and development of five (5) new background monitoring
wells. Owing to the availability of suitable background locations only four background wells (PMW-1,
PMW-2, MW-3 and PMW-4) were approved by NC DEQ and installed as shown in Figure 1. The
installation details,turbidity testing during development and hydraulic conductivity testing of these wells
was documented in our 2019 letter report3 which is included as Attachment 1 to this report.
Figure 1 also shows the location of wells and piezometers from which samples were analyzed for As,
Fe, and Mn as documented in the 2010 site investigation report. Where two piezometers are shown at
the same location they were completed at different depths. Note that MW-3 will be removed as the result
of the construction ofc the 1-540 corridor.
1 Eagle Resources,P.A.:Final_Groundwater_Baseline_Quality_Monitoring_Rev_020317
2 Eagle Resources,P.A.: Groundwater Mounding Analysis and Groundwater Quality Assessment,Wrenn Road Wastewater
Treatment Plant Spray Irrigation System, Gamer,Wake County,North Carolina 10,2010
3 Eagle Resources,P.A.:Documentation of Background Monitoring Well Installation and Testing,Letter Report to HDR
dated 11/08/19
1

We Pe5arcee
Rrf • kF Jr.
....7 ..%
EXPLANATION
Wells and Piezometers
® Background Monitoring Well
S Compliance Monitoring Well f
,. .4
� Non-Compliance Monitoring Well ,
/ O Piezometer Nest-Two depths
• Piezometer ........„ i ` difr I
Field Boundaries � I
• 1 Active GM
Closed owing to I-540 impacts
-
. Property Boundaries (Wake County GIS)
r 0
r _ 1
../ 46: 0 5.6 99-...„,1 .1 ,.
f
I ■R
1. f
• , p
.......
„., ..\.....„...,
r 11111
_ :
., .,.• .....
. • , _
. p
/ Ili
"(411.
....',..' .... ,,,.„. /......
y
r Mil:1-•r H,_1
,r-0010-- /
//
® 1 1
-
}
•
•
EMI FAII
•
`- 500 0 500 1,000 1,500 2,000 Ft
Figure 1.--Location of compliance and background wells and wells and piezometers sampled for the 2010 report.
2

Sampling of Background and Compliance Wells
The monitoring plan recommended that the background and compliance wells (MW-B3, MW-B8 and
MW-B9) be sampled bi-monthly for one year following the installation and development of the new
wells. The sampling was to follow the recommended procedure for low flow purging and field analysis
for pH, conductivity, turbidity and temperature. Samples taken were to be analyzed in the CORPUD
laboratory for As,Fe and Mn. One duplicate sample was to be taken from a randomly selected background
well each sampling round.
CORPUD staff obtained the samples from the background and compliance wells using the protocol
recommended in the monitoring plan and submitted the samples to the CORPUD laboratory. The results
of these analyses summarized in Table 1 and the sampling reports are included as Attachment 2 to this
report. Note that duplicate analyses are only available for the last two sampling rounds (8/20/20 and
11/4/20).
Table 2 shows the values for As, Fe, and Mn from Tables 8 and 9 of the 2010 report.
MW-B3 MW-B8 MW-B9 PMW-1 PMW-2 PMW-3 PMW-4 PMW-1 Dup
Constituent Date ug/I ug/I ugh ugh ug/1 ug/1 ug/I ug/I
11/5/19 <10 <10 <10 <10 <10 <10 <10 ns
1/17/20 <10 ns ns <10 <10 <10 <10 ns
3/12/20 <10 <10 <10 <10 <10 <10 <10 ns
As 4/14/20 <10 0 0 0 ns ns <10 ns
7/8/20 <10 <10 <10 ns ns ns ns ns
8/20/20 <10 ns na <10 <10 <10 <10 <10
11/4/20 1 <10 <10 <10 <10 <10 <10 <10 <10
11/5/19 180 76 82 <60 <60 199 172 ns
1/17/20 98 ns ns <60 <60 <60 68 ns
3/12/20 <60 <60 89 <60 <60 141 <60 ns
Fe 4/14/20 65 ns ns <60 <60 <60 <60 ns
7/8/20 234 <60 166 ns ns ns ns ns
8/20/20 118 ns ns <60 <60 482 69 <60
11/4/20 301 <60 135 <60 72 73 <60 <60
11/5/19 <50 <50 <50 90 <50 <50 134 ns
1/17/20 <50 ns ns 74 <50 <50 <50 ns
3/12/20 <50 <50 <50 64 <50 <50 88 ns
Mn 4/14/20 <50 ns ns 70 <50 <50 96 ns
7/8/20 <50 <50 <50 ns ns ns ns ns
8/20/20 <50 ns ns 88 <50 <50 123 90
11/4/20 <50 <50 <50 59 <50 <50 88 61
Notes:ns=no sample collected.
Table 1.--Results of laboratory analyses for As,Fe,and Mn from the background and compliance wells sampled in 2019 and 2020.
3

ta*eextrce5
As Fe Mn
Unfiltered Filgtered Unfiltered Filgtered Unfiltered Filgtered
Round 1 Round 2 Round 2 Round 1 Round 2 Round 2 Round 1 Round 2 Round 2
Well ug/I ug/I ug/I ug/I ug/I ug/I ug/I ug/I ug/I
_ MW-1 42 8 <50 11742 4157 16 1067 220 26 _
_ MW-2 8 ns ns 6369 ns ns 628 ns ns
MW-3 8 <50 <50 42 2497 39 371 ns 101
PZ-1 68 10 <50 3834 799 130 ns 1812 1676
_ PZ-2 61 11 <50 11694 2324 12 ns 443 91
_ PZ-3 9 ns ns 3024 ns ns ns ns ns
PZ-4 24 <50 <50 26276 921 78 4432 339 331
PZ-5 82 <50 <50 30202 153 8 4114 52 43
PZ-6 24 <50 <50 69147 28581 22710 561 1628 1968
PZ-7 111 6 <50 23603 1709 77 2163 144 47
PZ-8 61 <50 <50 31936 272 17 3160 21 19
PZ-9 24 ns ns 6921 ns ns 3460 ns ns
PZ-10 16 <50 <50 6958 578 22 3238 106 85
_ PZ-11 <50 ns ns 1406 ns ns 428 ns ns
PZ-12 31 <50 <50 10303 512 38 842 38 32
PZ-14 ns ns ns 1523 ns ns 553 ns ns
_ PZ-15 ns ns ns 684 ns ns 20 ns ns
PZ-16 6 ns ns 2388 ns ns 250 ns ns
PZ-17 16 ns I ns 2294 ns ns ns ns ns
PZ-18 42 <50 <50 6160 606 103 334 37 51
PZ-19 6 ns ns 3140 ns ns 220 ns ns
Notes:ns=no sample collected.
Table 2.--Results of laboratory analyses for As,Fe,and Mn from wells and piezometers reported in the 2010 report.
Data Analysis
Because all the values for As were below the method detection limit of 10 µg/1 for all samples,no statistical
analysis was performed for this constituent. To perform the analyses on Fe and Mn using all values from
the background samples that were less than the laboratory reported detection limits (10 µg/1 for Mn and
60 µg/1 for Fe) value of one (1)µg/1less that the limits was assigned(49 µg/1 for Mn and 59 µg/1 for Fe).
To answer the three questions posed previously, the concentrations of As,Fe, and Mn were compared by:
• Examination of plots of their log probability distributions; and
• Using One-Way Analysis of Variance (ANOVA)
Both statistical measures were computed using Microsoft ExcelTM
Probability Plots
The cumulative probability distributions of the log-transformed (ln or log base e) for Fe and Mn for the
background samples (compliance wells plus background wells), for the 2010 unfiltered samples and for
the 2010 filtered samples were computed and plotted for visual comparison.
Figure 2 shows the probability curves for Fe in the background samples and for the 2010 unfiltered
samples. This comparison shows that the Fe samples from the 2010 report are not from the same
population as the background samples. Fe concentrations for both sets of samples are approximately log-
normally distributed based on the apparent fit of the curves to the data points.
4

Fe All 2020 and 2010 Unfiltered
1.0 • • • • • • • _�
•
0.9
0.8 • •
0.7 •
_a 0.6
0
0.5
0.4
0.3 • In Fe 2020 —
—Norm Dist In Fe 2020
0.2 —
• In Fe 2010,unriltered
0.1 Norm Dist In Fe 2010 —
■ In Fe 2L Standard
0.0 I I I
0 2 4 6 8 10 12 14
In(Fe, ug/I)
Figure 2.--Cumulative probability plots for the log-transformed concentrations of Fe for background samples and 2010 report unfiltered
samples.
Figure 3 shows the probability curves for Fe in the background samples and for the 2010 filtered samples.
This comparison shows that the filtered Fe samples from the 2010 report are closer to the same population
as the background samples but still probably not equal. Fe concentrations for both sets of samples are
approximately log-normally distributed based on the apparent fit of the curves to the data points.
Fe All 2020 and 2010 Filtered
1.0 • •Ahjtilul"--
0.9 • I • • • • • •
0.8 —•
•
0.7 •
La
$ 0.6 •
0
- 0.5 �
0.4
• In Fe 2020
0.3 —Norm Dist In Fe 2020
0.2 • In Fe 2010,filtered
—Norm Dist In Fe 2010
0.1
• In Fe 2L Standard
0.0 • • I I I
0 2 4 6 8 10 12 14
In(Fe, ug/I)
Figure 3.--Cumulative probability plots for concentrations of Fe for background samples and 2010 report filtered samples.
5

ea*& cis
Figure 4 shows the probability curves for Fe in the background samples from the new background wells
and from the compliance wells. This comparison shows that Fe from the compliance wells and from the
new wells are from the same population and therefore can be pooled. Because the distributions for the
pooled samples for Fe are less than the 2L standard, the 21 standard of 300 1.1g/1 should be used for
compliance purposes. to establish the site-specific background value of. Fe concentrations for both sets
of samples are approximately log-normally distributed based on the apparent fit of the curves to the data
points.
Fe Compliance and Background Wells
1.0 _ • • • • •
• •
• • •
0.8
•
•
- 0.6
• •
a
0.4
• In Fe Compliance Wells
0.2 -Norm Dist In Fe Compliance Wells
• In Fe Background Wells
—Norm Dist In Fe Background Wells
0.0 • I I
2 3 4 In(Fe, ugh) 6 7 8
Figure 4.--Cumulative probability plots for concentrations of Fe in compliance wells and new background wells.
Figure 5 shows the probability curves for Mn in the background samples and for the 2010 unfiltered
samples. This comparison shows that the Mn samples from the 2010 report are not from the same
population as the background samples. Mn concentrations for both sets of samples are approximately
log-normally distributed based on the apparent fit of the curves to the data points.
Mn All 2020 and 2010 Unfiltered
1.0 • •
•
0.8 • •
• •
T
•
ro 0.6
0
L
d
0.4
•
• In Mn 2020
0,2 • —Norm Dist In Mn 2020 —
• In Mn 2010,unfiltered
—Norm Dist In Mn 2010
0.0 •-•'•••
0 1 2 3 4 6 7 8 9 10
In(Mn, ug I)
Figure 5.--Cumulative probability plots for concentrations of Mn for background samples and 2010 report filtered samples.
6

Figure 6 shows the probability curves for Mn in the background samples and for the 2010 filtered
samples. This comparison shows that the filtered Mn samples from the 2010 report are closer to the same
population as the background samples but still probably not equal. Mn concentrations for both sets of
samples are approximately log-normally distributed based on the apparent fit of the curves to the data
points.
Mn All 2020 and 2010 Filtered
1.0 •
•
0.9
0.8 • • • •
•
▪ 0.7 •
• •
(0▪ 0.6 •
0.5 ■
a •
0.4
•j • In Mn 2020
0.3 -Norm Dist In Mn 2020
0.2 • In Mn 2010,filtered
-Norm Dist In Mn 2010
0.1 •
• In Mn 2L Standard
0.0 •-•r•••
0 1 2 3 4 5 6 7 8 9 10
In(Mn ug/I)
Figure 6.--Cumulative probability plots for concentrations of Mn for background samples and 2010 report filtered samples.
Figure 7 shows the probability curves for Mn in the background samples from the new background wells
and from the compliance wells. This comparison shows that Mn from the compliance wells and from the
new wells are approximately from the same population but the compliance well data is skewed by all
being at the detection limit of 50 1.1g/1. Mn concentrations for both sets of samples are approximately
log-normally distributed based on the apparent fit of the curves to the data points.
The mean of the distributions for Mn when all data from the background and compliance wells are
considered is less than the 2L standard because of the large number of values less than the detection
concentration of 50 µg/1. Therefore, if the data from all of these wells is considered, the 21 standard of
50 µg/1 should be used for compliance purposes.
However, if only PMW-1 and PMW-4 are used to establish the site-specific background concentration of
Mn, there is statistical support for increasing it. The mean Mn value for all samples from these two wells
is 86 µg/1 and the standard deviation is 22 µg/1. If only these two wells are used, it is recommended that
the site-specific background concentration be set at 80 µg/l.
The large number of non-detect concentrations of Mn in the compliance wells is likely the result of dilution
by historical irrigation applied to their up-gradient fields. The non-detect values of Mn in PMW-2 and
PMW-3,which are located cross-gradient from all sprayfields, is likely the result of dilution from surface
runoff and flow in the stream located between them and the sprayfields.
7

Mn Compliance and Background Wells
1.0 • -
-�I • In Mn Compliance Wells
0.8 Norm Dist In Mn Compliance Wells
• In Mn Background Weg
Norm Dist In Mn Background Wells
3 0.6 ■ In Mn 2L Standard
co
irM • �r
0.4 ,
0.2
0.0
�i1����
2 3 4 5 6 7 8
In(Mn, ug/I)
Figure 7.--Cumulative probability plots for concentrations of Mn from compliance and new background wells.
Analysis of Variance
One-way Analysis of Variance(ANOVA)on the log-transformed values to further assess whether the new
background results from the compliance and background wells are from the same population as the 2010
samples. The analyses were conducted using the Data Analysis Package for Microsoft ExcelTM
Table 3 shows the ANOVA for Fe between the background samples and the unfiltered 2010 samples.
Because the F-statistic value of 161.37 is much greater than the Fcrit value of 3.98, the samples are not
from the same population, consistent with the probability plot analysis.
Fe Background +Compliance Wells vs 2010 Unfiltered Samples
Anova:Single Factor Alpha=0.01
Groups Count Sum Average Variance
In Fe Background Samples 40 177.345 4.434 0.295
In Fe 2010 Unfiltered Samples 33 264.667 8.020 2.839
ANOVA
Source of Variation SS df MS F P-value Fcrit
Between Groups 232.60 1 232.60 161.37 5.91E-20
Within Groups 102.34 71 1.44
Total 334.94 72
Table 3.--One-way ANOVA comparing the 2020 background values for Fe to the values for unfiltered samples from 2010.
Table 4 shows the ANOVA for Fe between the background samples and the filtered 2010 samples.
Because the F-statistic value of 1.028 is less than the Fcrit value of 4.030, the samples are from the same
population, consistent with the probability plot analysis and may be pooled.
8

tall R 5arCe5
Fe Background +Compliance Wells vs 2010 Unfiltered Samples
Anova: Single Factor Alpha =0.01
Groups Count Sum Average Variance
In Fe Background Samples 41 181.423 4.425 0.290
In Fe 2010 Filtered Samples 12 48.796 4.066 4.331
ANOVA
Source of Variation SS df MS F P-value F crit
Between Groups 1.19 1 1.194 I 1.028 0.315 4.030
Within Groups 59.26 51 1.162
Total 60.45 52
Table 4.--One-way ANOVA comparing the 2020 background values for Fe to the values for filtered samples from 2010.
Table 5 shows the ANOVA for Fe between the samples from the new background wells and the
compliance wells for the 2019-2020 background sampling period. Because the F-statistic value of 2.109
is less than the Fcrit value of 4.113, the samples are from the same population, consistent with the
probability plot analysis and may be pooled.
Fe Background Wells vs Compliance Wells
Anova:Single Factor Alpha=0.01
Groups Count Sum Average Variance
In Fe Compliance Wells 12 54.933 4.578 0.338
In Fe Background Wells 26 111.984 4.307 0.262
ANOVA
Source of Variation SS df MS F P-value Fcrit
Between Groups 0.60 1 0.602 2.109 0.155 4.113
Within Groups 10.27 36 0.285
Total 10.87 37
Table 5.--One-way ANOVA comparing the 2020 background values for Fe from the compliance wells and the new background wells.
Table 6 shows the ANOVA for Mn between the background samples and the unfiltered 2010 samples.
Because the F-statistic value of 59.48 is much greater than the Fcrit value of 3.98, the samples are not
from the same population, consistent with the probability plot analysis.
9

eemrces
Mn Background+Compliance Wells vs 2010 Unfiltered Samples
Anova:Single Factor Alpha=0.01
Groups Count Sum Average Variance
In Mn Background 41 166.577 4.063 0.083
In Mn 2010 Unfiltered 28 169.269 6.045 2.605
Source of Variation SS df MS F P-value Fcrit
Between Groups 65.39 1 65.39 59.48 7.95E-11 3.98
Within Groups 73.66 67 1.10
Total 139.05 68
Table 6.--One-way ANOVA comparing the 2020 background values for Mn to the values for unfiltered samples from 2010.
Table 7 shows the ANOVA for Mn between the background samples and the filtered 2010 samples.
Because the F-statistic value of 5.56 is close to the Fcrit value of 4.11, the samples probably are from
the same population, consistent with the probability plot analysis and may be pooled. The differences
between the two populations are the result of assigning a value of 49 µg/l. to samples that were reported
to be below the detection limit of 50 µg/l.
Mn Background+Compliance Wells vs 2010 Filtered Samples
Anova:Single Factor Alpha=0.01
Groups Count Sum Average Variance
In Mn Background 28 169.269 6.045 2.605
In Mn 2010 Filtered 11 51.659 4.696 2.535
ANOVA
Source of Variation SS df MS F P-value Fcrit
Between Groups 14.37 1 14.37 5.56 2.38E-02 4.111—ml
Within Groups 95.68 37 2.59
Total 110.06 38
Table 7.--One-way ANOVA comparing the 2020 background values for Mn from the compliance wells and the new background wells.
Table 8 shows the ANOVA for Mn between the samples from the new background wells and the
compliance wells for the 2019-2020 background sampling period. Because the F-statistic value of 5.95
is close to the Fcrit value of 4.09, the samples probably are from the same population, consistent with the
probability plot analysis and may be pooled. The differences between the two populations are the result
of assigning a value of 49 µg/l. to samples that were reported to be below the detection limit of 50 µg/l.
10

Mn Background vs Compliance Wells
Anova:Single Factor Alpha=0.01
Groups Count Sum Average Variance
In Mn Compliance Wells 11 42.806 3.891 0.000
In Mn Background Wells 30 123.767 4.126 0.100
ANOVA
Source of Variation SS df MS F P-value Fcrit
Between Groups 0.44 1 0.44 5.95 1.94E-02
Within Groups 2.89 39 0.07
Total 3.33 40
Table 8.--One-way ANOVA comparing the values for Mn from the compliance wells vs. the new background wells.
Pooling of new samples and the 2010 samples
The monitoring plan recommended that if samples from the background sampling were statistically from
the same population as those from the 2010 study that they should be pooled to determine if they should
be used to set site-specific background concentrations for Few and Mn.
Because the statistical analyses in the foregoing show that the 2011 unfiltered sample results for both Fe
and Mn are not from the same population as those from the background monitoring program samples to
date the 2011 unfiltered samples should not be used in an assessment of a site-specific background
standard for either Fe or Mn.
The filtered samples from 2011 for both Fe and Mn appear to approximately from the same population
as the background monitoring program samples. This is likely because purging and sampling protocol
used for the background program accomplished the same reduction in turbidity and suspended fine
particulate matter as filtration did for the 2010 samples. Because filtration of samples is not included in
the accepted sampling and analysis protocol by NC DEQ, it is recommended that the 2010 filtered
sample data not be used in assessing site-specific background standards for either constituent.
11

ea 'e Pemrces
Time Trends
The monitoring plan recommended sampling the new background wells for one year on the same
schedule used for the compliance wells (March, July, and November)to evaluate any time trends
in As, Fe, Mn to consider in compliance assessments. The values plotted and analyzed below are
not log-transformed as the conclusions reached regarding the significance of the slope of the
trend lines is not affected by the transformation. Plots are only included for those wells in
which the number of sample results greater than the detection limits for either Fe or Mn provided
for a meaningful analysis.
Figure 8 and Table 9 show that there is a statistically significant increase in Fe in MW-B3
because the F -statistic value of 1.884 shown in Table 9 is greater than the Significance F value
of 0.228.
Fe and Mn in MW-B3
350
300 • Fe MW-B3 •
• Mn MW-B3
250 Linear(Fe MW-B3)
Linear(Mn MW-B3) •
°° 200
. •
2 150
oZS •
LL 100 ..•..
•
50
0
0 50 100 150 200 250 300 350 400
Days since 11/01/2019
Figure 8.--Time trend in Fe and Mn in compliance sell MW-B3.
Fein Compliance Well MW-B3
Regression Statistics
MultipleR 0.5232 ANOVA
RSquare 0.2737 df SS MS F SignificanceF
Adjusted R Square 0.1285 Regression 1 13682 13682 1.884 0.228
Standard Error 85.2120 Residual 5 36305 7261
Observations 7 Total 6 49987
Coefficients Standard Error t Stat P-value Lower 95% Upper 95% Lower 95.0% Upper 95.0%
Intercept 81.6359 59.7471 1.3664 0.2301 -71.9489 235.2207 -71.9489 235.2207
Days 0.3748 0.2731 1.3727 0.2282 -0.3271 1.0768 -0.3271 1.0768
Table 9.--Regression analysis for the significance of the slope of the regression line for Fe in MW-B3.
12

Gr e PemrGes
Figure 9 and Table 10 show that there is a statistically significant increase in Fe in MW-B9
because the F -statistic value of 2.85 shown in Table 10 is greater than the Significance F value
of 0.23.
Fe and Mn in MW-B9
180 I I I
• Fe MW-B9 •
160 • Mn MW-B9
140 Linear(Fe MW-B9)
Linear(Mn MW-B9) •
120
100
- 80 ••' •
o5
°1 60
• .•... • •
40
20
0
0 50 100 150 200 250 300 350 400
Days since 11/01/2019
Figure 9.--Time trend in Fe and Mn in compliance sell MW-B9.
Fein Compliance Well MW-B9
Regression Statistics
MultipleR 0.767 ANOVA
R Square 0.588 df SS MS F Significance F
Adjusted R Square 0.381 Regression 1.00 2778.98 2778.98 2.85 0.23
Standard Error 31.233 Residual 2.00 1951.02 975.51
Observations 4 Total 3.00 4730.00
Coefficients Standard Error tStat P-value Lower95% Upper95% Lower95.0% Upper95.0%
Intercept 81.32 26.76 3.04 0.09 -33.82 196.46 -33.82 196.46
Days 0.19 0.12 1.691 0.23 -0.30 0.69 -0.30 0.69
Table 10.--Regression analysis for the significance of the slope of the regression line for Fe in MW-B9.
Figure 10 and Table 11 show that there is not a statistically significant increase in Fe in new
background well PMW-3 because the F -statistic value of 0.238 shown in Table 11 is less than
the Significance F value of 0.651.
13

ea*Pesarces
Fe and Mn in PMW-3
600 I I I
• Fe PMW-3
Mn PMW-3
500 Linear(Fe PMW-3) •
Linear(Mn PMW-3)
400
on
300
o5
° 200 •
.. . . . . . . ... .
100
• i $ .•. ....••
0
0 50 100 150 200 250 300 350 400
Days since 11/01/2019
Figure 10.--Time trend in Fe and Mn in new background well PMW-3.
Fein Background Well PMW-3
Regression Statistics
Multiple R 0.237 ANOVA
R Square 0.056 df SS MS F Significance F
Adjusted R Square -0.180 Regression 1 7469.461 7469.461 0.238 0.651
Standard Error 177.200 Residual 4 125599.372 31399.843
Observations 6.000 Total 5 133068.833
Coefficients Standard Error t Stat P-value Lower 95% Upper 95% Lower 95.0% Upper 95.0%
Intercept 119.534 124.298 0.962 0.391 -225.573 464.642 -225.573 464.642
Days 0.284 0.583 0.488 I 0.651 -1.335 1.903 -1.335 1.903
Table 11.--Regression analysis for the significance of the slope of the regression line for Fe in PMW-3.
Figure 11 and Table 12 show that there is a statistically significant decrease in Fe in new
background well PMW-4 because the F -statistic value of 2.64 shown in Table 12 is greater than
the Significance F value of 0.192. Although samples from PMW-4 showed values of Mn greater
than the detection limit, there is no significant time trend in these values because the F -statistic
value of 7.67x10-5 shown in Table 12 is less than the Significance F value of 0.993.
14

ea*Pesarces
Fe and Mn in PMW-4
200 _ I I
• Fe PMW-4
180 • • Mn PMW-4
160 Linear(Fe PMW-4)
Linear(Mn PMW-4)
140
•
= 120 •
c
100 ,,mot „♦
80
• •
60 • • •
•
40
20
0
0 50 100 150 200 250 300 350 400
Days since 11/01/2019
Figure 11.--Time trend in Fe and Mn in new background well PMW-4.
Fein Background Well PMW-4
Regression Statistics
MultipleR 0.617 ANOVA
RSquare 0.381 df SS MS F SignificanceF
Adjusted R Square 0.227 Regression 1 3829.740 3829.740 2.464 0.192
Standard Error 39.422 Residual 4 6216.260 1554.065
Observations 6.000 Total 5 10046.000
Coefficients Standard Error t Stat P-value Lower 95% Upper 95% Lower 95.0% Upper 95.0%
Intercept 116.300 27.653 4.206 0.014 39.524 193.076 39.524 193.076
Days -0.204 0.130 -1.570 0.192 -0.564 0.157 -0.564 0.157
Table 12.--Regression analysis for the significance of the slope of the regression line for Fe in PMW-4.
Mn in Background Well PMW-4
Regression Statistics
MultipleR 0.004 ANOVA
RSquare 0.000 df SS MS F SignificanceF
Adjusted R Square -0.250 Regression 1 0.086 0.086 7.67E-05 0.993
Standard Error 33.575 Residual 4 4509.247 1127.312
Observations 6.000 Total 5 4509.333 _
Coefficients Standard Error tStat P-value Lower95% Upper95% Lower95.0% Upper95.0%
Intercept 96.165639 23.552 4.083 0.015 30.775 161.556 30.775 161.556 _
X Variable 1 0.00096747 0.110 0.009 0.993 -0.306 0.308 -0.306 0.308
15

ea*Pesarces
Conclusions
The data from the 2010 study for Fe and Mn in groundwater samples is not statistically from the
same population as that from the data from the compliance and new background wells and
should not be used in assessing site-specific background standards
The data from the background sampling program to date show that the mean and standard
deviation of the concentrations for Fe are lower than the 2L groundwater standard of 300 µg/1
respectively. Consequently, the 2L standards should continue to be use as the values for
compliance monitoring for Fe.
Because there appears to be statistically significant changes over time since the start of the
compliance sampling in November of 2019 in Fe concentrations in some of the compliance and
background wells, it is recommended that these trends be assessed on an annual basis to
determine if there is a basis for increasing the Fe standard for the site to a value greater than the
2L standard
Concentrations of As in the compliance and background wells have all been less than the 2L
standard of 10 µg/1 and therefore,that value should continue to be used as the value for
compliance monitoring.
The mean of the distributions for Mn when all data from the background and compliance wells are
considered is less than the 2L standard because of the large number of values less than the detection
concentration of 50 µg/1. Therefore,if the data from all of these wells is considered,the 21 standard
of 50 µg/1 should be used for compliance purposes.
However, if only PMW-1 and PMW-4 are used to establish the site-specific background
concentration of Mn. The mean Mn value for all samples from these two wells is 86 µg/1 and the
standard deviation is 22 µg/1. If only these two wells are used, it is recommended that the site-
specific background concentration be set at 85 µg/1.
The large number of non-detect concentrations of Mn in the compliance wells is likely the result
of dilution by historical irrigation applied to their up-gradient fields. The non-detect values of Mn
in PMW-2 and PMW-3 which are located cross-gradient from all sprayfields is likely the result of
dilution from surface runoff to and surface flow in the stream located between them and the
sprayfields.
16

ea/e►('emrces
Attachment 1 Approved Background Sampling Program
The following steps are recommended to implement the determination of background
concentrations of Fe and Mn at the Wrenn Road Site:
1. Install and develop the five (5)new background monitoring wells as recommended
herein;
2. Sample the background and compliance wells bi-monthly for six (6)months following
the installation and development of the new wells. The sampling should follow the
recommended low-flow purging, and field analysis for pH, Conductivity, Turbidity, and
Temperature. Samples taken should be analyzed in the CORPUD laboratory for As, Fe
and Mn This will provide a background sample size of 15 (5 wells x 3 samples) for each
constituent. One duplicate should be taken from a randomly selected background well
each sampling round;
3. Prepare probability plots of the 15 sample results for each constituent using the log
transform of the raw values; and visually compare to the plots for the 2010 samples;
4. Conduct One-way Analysis of Variance (ANOVA) on the log-transformed values to
assess whether the new background results are from the same population as the 2010
samples;
5. If the ANOVA shows that the new and 2010 samples are from the same population, pool
both to define the background statistics to use in compliance monitoring; or
6. If the ANOVA shows that the new and 2010 samples are not from the same population,
use only the new samples to define the background statistics to use in compliance
monitoring; and
Sample the new background wells for one year on the same schedule used for the compliance
wells (March, July, and November)to evaluate any time trends in As, Fe, Mn to consider in
compliance assessments. Log transformation should be applied to all these data.
17

em/e►('esarces
Attachment 2 Sampling Reports from CORPUD
18

City of Raleigh
Wrenn Road Groundwater Monitoring Plan
Permit No.WQ0002708
Notes:
Before collecting samples,low flow well purging should continue until turbidity<10 NTU or vary no morethan 10%
Before collecting samples,pH and water temperature should be stable
One duplicate should be collected from one ofthe background wells for each sampling round
Try to usethe same equipment during sampling,and note when alternate equipment is used to help account for a difference in results
Month November 2019 Background MW-B3 PMW-1 PMW-2 PMW-3 PMW-4
Statistics
Sampled By D.Godfrey R.Tart D.Godfrey R.Tart D.Godfrey
Date 11/5/19 11/21/19 11/21/19 11/21/19 11/21/19
Time 8:05 11:18 8:40 12:23 12:10
Daily Weather Condition Clear/Cool/Sunny
Depth to water 21.65' 24' 8' 6' 21.9'
Total well depth 30' 43' 20' 16' 74'
Volume of water purged before 4.25 gal 9.31 gal 6 gal 4.57 gal 25.5 gal
sampling(gal)
Field Data Turbidity(NTU) 0.87 0.48 1.86 1.58 5.08
pH,units 5.23 5.75 5.3 6.03 5.97
Temperature,°C 16.6 16.6 16.8 16.9 17.6
Conductivity(umhos/cm) 45.9 98.9 69.6 129.8 126.2
Iron(pg/L) 180 <60 <60 199 172
Lab Data -
Manganese(pg/L) <50 90 <50 <50 134
I
Arsenic(pg/L) <10 <10 <10 <10 <10

CITY OF RALEIGH
EM JOHNSON WATER PLANT LABORATORY
Wrenn Road Spray Irrigation Facility
Permit No. W00002708
Wells Monitoring Data Results
Month: November
Year:2019
Location: MW-3
Daily Max
Collection Date Parameter Results Units of Measure
Limits
05-Nov-19 Arsenic <10 ug/L 10
05-Nov-19 Conductivity 45.9 umhos/cm
05-Nov-19 Iron 180 ug/L 300
05-Nov-19 Manganese <50 ug/L 50
05-Nov-19 pH 5.23 su 6.5-8.5
05-Nov-19 Temperature 16.6 C
05-Nov-19 Turbidity 0.87 NTU
05-Nov-19 Arsenic <10 ug/L I 10
05-Nov-19 Chloride <10 mg/L 250
05-Nov-19 Conductivity 45.9 umhos/cm
05-Nov-19 DO 2.39 mg/L
05-Nov-19 Fecal MPN 0 MPN/100 ml
05-Nov-19 Nitrate 0.8 mg/L 10
05-Nov-19 pH 5.23 su 6.5-8.5
05-Nov-19 Sulfate <10 ppm 250
05-Nov-19 Total Dissolved Solids @ 180 degrees 86 mg/L 500
05-Nov-19 Temperature 16.6 C
05-Nov-19 TOC <1.0 mg/L
Location: MW-8
Daily Max
Collection Date Parameter Results Units of Measure
Limits
05-Nov-19 Arsenic --10 ug/L 10
05-Nov-19 Chloride 23.07 mg/L 250
05-Nov-19 Conductivity 94.9 umhos/cm
05-Nov-19 DO 2.86 mg/L
05-Nov-19 Fecal MPN 0 MPN/100 ml
05-Nov-19 Iron 76 ug/L 300
05-Nov-19 Manganese <50 ug/L 50
05-Nov-19 Nitrate 0.37 mg/L 10
05-Nov-19 pH 5.07 su 6.5-8.5
05-Nov-19 Sulfate <10 ppm 250
05-Nov-19 Total Dissolved Solids @ 180 degrees 142 mg/L 500
05-Nov-19 Temperature 15.5 C
05-Nov-19 TOC <1.0 mg/L
05-Nov-19 Turbidity 0.77 NTU
Location: MW-9 I
Daily Max
Collection Date Parameter Results Units of Measure
Limits
05-Nov-19 Arsenic <10 ug/L 10
05-Nov-19 Chloride 27.66 mg/L 250
05-Nov-19 Conductivity 144.6 umhos/cm
05-Nov-19 DO 1.71 mg/L
05-Nov-19 Fecal MPN 0 MPN/100 ml
05-Nov-19 Iron 82 ug/L 300
05-Nov-19 Manganese <50 ug/L _ 50
05-Nov-19 Nitrate 1.29 mg/L 10
05-Nov-19 pH 5.05 su 6.5-8.5
05-Nov-19 Sulfate 10.36 ppm 250
05-Nov-19 Total Dissolved Solids @ 180 degrees 172 mg/L 500
05-Nov-19 Temperature 17.4 C
05-Nov-19 TOC <1.0 mg/L
05-Nov-19 Turbidity 1.52 NTU

City of Raleigh
Wrenn Road Groundwater Monitoring Plan
Permit No.WQ0002708
Notes:
Before collecting samples,low flow well purging should continue until turbidity<10 NTU or vary no morethan 10%
Before collecting samples,pH and water temperature should be stable
One duplicate should be collected from one of the background wells for each sampling round
Try to usethe same equipment during sampling,and note when alternate equipment is used to help account for a difference in results
Month Januarv2020Background MW-B3 PMW-1 PMW-2 PMW-3 PMW-4
Statistics
Sampled By D.Godfrey R.Tart R.Tart R.Tart D.Godfrey
Date 1/17/20 1/17/20 1/17/20 1/17/20 1/17/20
Time 1002 1005 1049 818 1040
Daily Weather Condition Partly Sunny,Cool
Depth to water 19.1 23.8 7.4 5.6 20.5
Total well depth 30' 43' 20' 16' 74'
Volume of water purged before 4.75 gals 9.4 gals 6.1 gals 6.5 gals 27 gals
sampling(gal)
Field Data
Turbidity(NTU) 1.3 0.98 0.48 1.06 2.04
pH,units 4.86 5.87 6.02 6.68 6.07
Temperature,°C 16.2 14 15.1 12.8 15.3
Conductivity(umhos/cm) 43 91.6 67.2 110.1 121.2
Iron(pg/L) 98 <60 <60 <60 68
Lab Data
Manganese(pg/L) <50 74 <50 <50 <50
Arsenic(pg/L) <10 <10 <10 <10 <10

City of Raleigh
Wrenn Road Groundwater Monitoring Plan
Permit No.WQ0002708
Notes:
Before collecting samples,low flow well purging should continue until turbidity<10 NTU or vary no morethan 10%
Before collecting samples,pH and water temperature should be stable
One duplicate should be collected from one of the background wells for each sampling round
Try to usethe same equipment during sampling,and note when alternate equipment is used to help account for a difference in results
Month March 2020 Background MW-B3 PMW-1 PMW-2 PMW-3 PMW-4
Statistics
Sampled By D.Godfrey D.Godfrey R.Tart R.Tart D.Godfrey
Date 3/12/20 3/12/20 3/12/20 3/12/20 3/12/20
Time 1040 1206 750 1230 959
Daily Weather Condition Cloudy,Cool
Depth to water 19.1 20.85 7.5 5.3 16.2
Total well depth 30' 43' 20' 16' 74'
Volume of water purged before 5.5 gals 11 gals 7 gals 5.25 gals 28.5 gals
sampling(gal)
Field Data
Turbidity(NTU) 0.78 1.31 0.53 3.49 1.76
pH,units 4.85 5.31 5.93 7.03 6.16
Temperature,°C 16.6 18.2 14.6 14.3 16.8
Conductivity(umhos/cm) 41.4 90.9 71.8 62.2 115.4
Iron(pg/L) <60 <60 <60 141 <60
Lab Data
Manganese(pg/L) <50 64 <50 <50 88
Arsenic(pg/L) <10 <10 <10 <10 <10

CITY OF RALEIGH
EM JOHNSON WATER PLANT LABORATORY
Wrenn Road Spray Irrigation Facility
Permit No. WQ0002708
Wells Monitoring Data Results
Month: March
Year: 2020
I oration. MW-S
Collection Date Parameter Results Units of Measure Daily Max
12-Mar-20 Arsenic <10 ug/1. 10
12-Mar-20 Chloride <10 mg/L 250
12-Mar-20 Conductivity 41.4 umhos/cm
12-Mar-20 DO 3.11 mg/L
12-Mar-20 Fecal MPN 0 MPN/100 ml
12-Mar-20 Iron <60 ug/L 300
12-Mar-20 Manganese <50 ug/L 50
12-Mar-20 Nitrate 0.68 mg/L 10
12-Mar-20 pH 4.85 pH 6.5-8.5
12-Mar-20 Sulfate <10 ppm 250
12-Mar-20 Total Dissolved Solids @ 180 degrees C 39 mg/L 500
12-Mar-20 Temperature 16.6 C
12-Mar-20 TOC <0.5 mg/L
12-Mar-20 Turbidity 0.78 NTU
I oration! MW-R
Collection Date Parameter Results Units of Measure Daily Max
12-Mar-20 Arsenic <10 ug/L 10
12-Mar-20 Chloride 17.8 mg/L 250
12-Mar-20 Conductivity 77 umhos/cm
12-Mar-20 DO 5.20 mg/L
12-Mar-20 Fecal MPN 0 MPN/100 ml
12-Mar-20 Iron <60 ug/L 300
12-Mar-20 Manganese <50 ug/L 50
12-Mar-20 Nitrate 0.44 mg/L 10
12-Mar-20 pH 6.33 pH 6.5-8.5
12-Mar-20 Sulfate <10 ppm 250
12-Mar-20 Total Dissolved Solids @ 180 degrees C 62 mg/L 500
12-Mar-20 Temperature 15.5 C
12-Mar-20 TOC <0.5 mg/L
12-Mar-20 Turbidity 0.56 NTU
I oration! MW-9
Collection Date Parameter Results Units of Measure Daily Max
12-Mar-20 Arsenic <10 ug/L 10
12-Mar-20 Chloride 11.41 mg/L 250
12-Mar-20 Conductivity 76.9 umhos/cm
12-Mar-20 DO 3.14 mg/L
12-Mar-20 Fecal MPN 0 MPN/100 ml
12-Mar-20 Iron 89 ug/L 300
12-Mar-20 Manganese <50 ug/L 50
12-Mar-20 Nitrate 0.54 mg/L 10
12-Mar-20 pH 7.02 pH 6.5-8.5
12-Mar-20 Sulfate <10 ppm 250
12-Mar-20 Total Dissolved Solids @ 180 degrees C 54 mg/L 500
12-Mar-20 Temperature 16.0 C
12-Mar-20 TOC 0.7404 mg/L
12-Mar-20 Turbidity 3.87 NTU

City of Raleigh
Wrenn Road Groundwater Monitoring Plan
Permit No.WQ0002708
Notes:
Before collecting samples,low flow well purging should continue until turbidity<10 NTU or vary no morethan 10%
Before collecting samples,pH and water temperature should be stable
One duplicate should be collected from one of the background wells for each sampling round
Try to usethe same equipment during sampling,and note when alternate equipment is used to help account for a difference in results
Month April 2020 Compliance MW-B3 I PMW-1 PMW-2 PMW-3 PMW-4
Monitoring
Sampled By D.Godfrey R.Tart R.Tart R.Tart D.Godfrey
Date 4/14/20 4/14/20 4/14/20 4/14/20 4/14/20
Time 1107 1015 830 1145 1028
Daily Weather Condition Sunny,Clear 60s
Depth to water 19' 20.9' 7.7' 5.7' 16.4'
Total well depth 30' 43' 20' 16' 74'
Volume of water purged before 5.5 Gallons 10.8 Gallons 6.5 Gallons 5.0 Gallons 28.25 Gallons
sampling(gal)
Field Data
Turbidity(NTU) 0.44 0.39 0.23 0.46 1.61
pH 4.82 7.15 7.32 6.27 6.05
Temperature 17.2 17.6 14.8 15.5 17
Conductivity(umhos/cm) 39.8 92.2 68.8 116.4 110.8
Iron(pg/L) 65 <60 <60 <60 <60
Lab Data
Manganese(pg/L) <50 70 <50 <50 96
Arsenic(Ng/0 <10 <10 <10 <10 <10

CITY OF RALEIGH
EM JOHNSON WATER PLANT LABORATORY
Wrenn Road Spray Irrigation Facility
Permit No. WQ0002708
Wells Monitoring Data Results
Month: July
Year: 2020
Lnratinny MW-3
Collection Date Parameter Units of Measure Results Daily Max
7/8/2020 pH su 5.19 6.5 -8.5
7/8/2020 Fecal Coliform col/100 ml 0
7/8/2020 Total Dissolved Solids @ 180°C mg/I 38 500
7/8/2020 Total Organic Carbon mg/I <0.5
7/8/2020 Chloride mg/1 5.17 250
7/8/2020 Nitrate Nitrogen mg/1 0.44 10
7/8/2020 Sulfate mg/I <5 250
7/8/2020 Iron ug/I 234 300
7/8/2020 Manganese ug/I <50 50
7/8/2020 Arsenic ug/I <10 10
7/8/2020 Total Phosphorus mg/1 <0.05
7/8/2020 Acrylamide ug/I <0.50 0.008
I nratinn! MW-R
Collection Date Parameter Units of Measure Results Daily Max
7/8/2020 pH su 5.35 6.5 -8.5
7/8/2020 Fecal Coliform col/100 ml 0
7/8/2020 Total Dissolved Solids @ 180°C mg/1 55 500
7/8/2020 Total Organic Carbon mg/I <0.5
7/8/2020 Chloride mg/I 17.9 250
7/8/2020 Nitrate Nitrogen mg/I 0.02 10
7/8/2020 Sulfate mg/I <5 250
7/8/2020 Iron ug/I <60 300
7/8/2020 Manganese ug/I <50 50
7/8/2020 Arsenic ug/I <10 10
7/8/2020 Total Phosphorus mg/I <0.05
7/8/2020 Acrylamide ug/I <0.50 0.008
Lnratinnr MW-9
Collection Date Parameter Units of Measure Results Daily Max
7/8/2020 pH su 5.32 6.5 -8.5
7/8/2020 Fecal Coliform col/100 ml 0
7/8/2020 Total Dissolved Solids @ 180°C mg/I 71 500
7/8/2020 Total Organic Carbon mg/I 1.01
7/8/2020 Chloride mg/1 20.9 250
7/8/2020 Nitrate Nitrogen mg/1 1.47 10
7/8/2020 Sulfate mg/I 6.99 250
7/8/2020 Iron ug/I 166 300
7/8/2020 Manganese ug/I <50 50
7/8/2020 Arsenic ug/I <10 10
7/8/2020 Total Phosphorus mg/1 <0.05
7/8/2020 Acrylamide ug/I <0.50 0.008

City of Raleigh
Wrenn Road Groundwater Monitoring Plan
Permit No.WQ0002708
Notes:
Before collecting samples,low flow well purging should continue until turbidity<10 NTU or vary no morethan 10%
Before collecting samples,pH and water temperature should be stable
One duplicate should be collected from one of the background wells for each sampling round
Try to usethe same equipment during sampling,and note when alternate equipment is used to help account for a difference in results
Month August 2020 Comoliance MW-B3 PMW-1 PMW-1 Dup PMW-2 PMW-3 PMW-4
Monitoring
Sampled By Roy Tart Roy Tart Roy Tart Roy Tart Roy Tart Roy Tart
Date 8/20/20 8/20/20 8/20/20 8/20/20 8/20/20 8/20/20
Time 14:35 13:25 13:25 12:01 15:15 12:45
Daily Weather Condition Cloudy 80°F
Depth to water 20.3 22.8 22.8 9.8 6 19
Total well depth 30 43 43 20 30 74
Volume of water purged before 4.7 9.8 9.8 5.1 5 26
sampling(gal)
Field Data Turbidity(NTU) 0.9 0.68 0.68 1.46 1.69 1.5
pH 5.8 5.93 5.93 6.01 6.63 6.81
Temperature 18.5 19.1 19.1 20.7 19.8 19
Conductivity(umhos/cm) 111 94.5 96.7 73.3 43.5 124.5
Iron(pg/L) 118 <60 <60 <60 482 69
Manganese(pg/L) <50 88 90 <50 <50 123
Arsenic)pglL) <10 <10 <10 <10 <10 <10

City of Raleigh
Wrenn Road Groundwater Monitoring Plan
Permit No.WQ0002708
Notes:
Before collecting samples,low flow well purging should continue until turbidity<10 NTU or vary no morethan 10%
Before collecting samples,pH and water temperature should be stable
One duplicate should be collected from one ofthe background wells for each sampling round
Try to usethe same equipment during sampling,and note when alternate equipment is used to help account for a difference in results
Month November 2020 Compliance MW-B3 PMW-1 PMW-1 Dup PMW-2 PMW-3 PMW-4
Monitoring
Sampled By D.Godfrey D.Godfrey D.Godfrey D.Godfrey D.Godfrey D.Godfrey/E.
Batchelor
Date 11/4/20 11/4/20 11/4/20 11/4/20 11/4/20 11/4/20
Time 9:43 8:25 8:25 9:08 10:44 12:00
Daily Weather Condition Clear 48°C Clear 40°C Clear 40°C Clear 40°C Clear 55°C Clear 62°C
Depth to water 19.95 22.3 22.3 7.8 5.7 18.9
Total well depth 30' 43' 43' 20' 16' 74'
Volume of water purged before 5 10.25 10.25 6 5.25 27
sampling(gal)
Field Data Turbidity(NTU) 0.73 1.12 1.12 1.86 0.44 0.72
pH 4.79 5.32 5.32 5.08 5.65 5.87
Temperature 17.8 17 17 18.5 18.1 18.2
Conductivity(umhos/cm) 41.4 82 82.4 73.6 101.5 129.8
Iron)pg/L) 301 <60 <60 72 73 <60
Manganese(pg/L) <50 59 61 <50 <50 88
Arsenic(Ng/L) <10 <10 <10 <10 <10 <10

CITY OF RALEIGH
EM JOHNSON WATER PLANT LABORATORY
Wrenn Road Sorav Irrigation Facility
Permit No. W00002708
Wells Monitoring Data Results
Month: November
Year: 2020
Location: MW-3
_ Collection Date Parameter Results Units of Measure Daily Max _
_ 04-Nov-20 Arsenic <10 ug/L 10 _
04-Nov-20 Conductivity 41.4 umhos/cm
_ 04-Nov-20 Iron 334 ug/L 300 _
_ 04-Nov-20 Manganese <50 ug/L 50 _
04-Nov-20 pH 4.79 su 6.5-8.5
04-Nov-20 Temperature 17.8 C _
_ 04-Nov-20 Turbidity 0.73 NTU _
05-Nov-20 Arsenic <10 ug/L 10
_ 05-Nov-20 Chloride 6.073 mg/L 250
_ 05-Nov-20 Conductivity 40.3 umhos/cm
05-Nov-20 DO 2.06 mg/L
05-Nov-20 Fecal MPN 0 MPN/100 ml
_ 05-Nov-20 Iron 301 ug/L 300
05-Nov-20 Manganese <50 ug/L 50
05-Nov-20 Nitrate 0.35 mg/L 10
05-Nov-20 pH 4.52 su 6.5-8.5
05-Nov-20 Sulfate <5 ppm 250
05-Nov-20 Total Dissolved Solids(&,180 degrees 41 mg/L 500
05-Nov-20 Temperature 17.2 C _
05-Nov-20 TOC <1.0 mg/L
05-Nov-20 Total Phosphorus <0.04 mg/L
05-Nov-20 Turbidity 0.76 NTU
I nratinn• M\A/-R
Collection Date Parameter Results Units of Measure Daily Max
05-Nov-20 Arsenic <10 ug/L 10
05-Nov-20 Chloride 21.932 mg/L 250
05-Nov-20 Conductivity 91.4 umhos/cm
05-Nov-20 DO 3.78 mg/L
05-Nov-20 Fecal MPN 0 MPN/100 ml
05-Nov-20 Iron <60 ug/L 300
05-Nov-20 Manganese <50 ug/L 50
05-Nov-20 Nitrate <0.04 mg/L 10
_ 05-Nov-20 pH 4.69 su 6.5-8.5
_ 05-Nov-20 Sulfate <5 ppm 250
05-Nov-20 Total Dissolved Solids(cl 180 degrees 73 mg/L 500
_ 05-Nov-20 Temperature 16.2 C _
05-Nov-20 TOC <1.0 mg/L
05-Nov-20 Total Phosphorus <0.04 mg/L
05-Nov-20 Turbidity 0.88 NTU
I nratinn• M\A/-Q
Collection Date Parameter Results Units of Measure Daily Max
05-Nov-20 Arsenic <10 ug/L 10
05-Nov-20 Chloride 22.576 mg/L 250
05-Nov-20 Conductivity 122.0 umhos/cm
05-Nov-20 DO 1.41 mg/L
05-Nov-20 Fecal MPN 0 MPN/100 ml
05-Nov-20 Iron 135 ug/L 300
05-Nov-20 Manganese <50 ug/L 50
05-Nov-20 Nitrate 1.04 mg/L 10
05-Nov-20 pH 4.64 su 6.5-8.5
05-Nov-20 Sulfate 8.892 ppm 250
05-Nov-20 Total Dissolved Solids A 180 degrees 81 mg/L 500
05-Nov-20 Temperature 17.3 C
05-Nov-20 TOC <1.0 mg/L
_ 05-Nov-20 Total Phosphorus <0.04 mg/L
05-Nov-20 Turbidity 5.97 NTU