NC0086924_Application (ATC)_20010725

State of North Carolina
Department of Environment
and Natural Resources
Division of Water Quality
Michael F. Easley, Governor
William G. Ross, Jr., Secretary
Kerr T. Stevens, Director
July 25, 2001
Mr. Robert W. Oreskovich, Director
Dare County Water Department
600 Mustian St.
Kill Devil Hills, North Carolina 27948
NCDENR
NORTH CAROLINA DEPARTMENT OF
ENVIRONMENT AND NATURAL RESOURCES
Subject: Authorization to Construct Permit Issuance
ATC Number 086932ACA
Dare County/ Stumpy Point RO WTP
Discharge
NPDES Permit NCO086932
Dare County
Dear Mr. Oreskovich:
A letter of request for an Authorization to Construct (ATC) was received March 7, 2001 and
final plans and specifications for this project have been reviewed and found to be satisfactory.
Authorization is hereby granted for the outfall line for wastewater generated from the Dare County/
Stumpy Point Reverse Osmosis plant. Specifically, this ATC allows the installation of:
• Approximately 420 linear feet of 4", HDPE pipe,
(with gate valve prior to directional bore)
• Approximately 215 linear feet of 4" HDPE directional bore pipe,
(bored to a point 100 ft. from shoreline)
Diffuser - 10 feet with 4, 3" check valves and concrete anchor,
• all additional piping, valves, control equipment and appurtenances.
Once construction under this ATC has been completed and an Engineer's Certificate has been
submitted, the permittee is authorized to operate the above components and discharge. All pipe
crossings shall meet the minimum requirements specified in 15A NCAC 2H .0219(i)(2)(G)(ii).
This Authorization to Construct is issued in accordance with NPDES Permit No. NCO086932
issued March 23, 2001, and shall be subject to revocation unless the wastewater treatment facilities
are constructed in accordance with the conditions and limitations specified in the permit.
The sludge generated from these treatment facilities must be disposed of in accordance with
G.S. 143-215.1 and in a manner approved by the North Carolina Division of Water (quality.
In the event that the facilities fail to perform satisfactorily, including the creation of nuisance
conditions, the Permittee shall take immediate corrective action, including those as may be required by
this Division, such as the construction of additional or replacement wastewater treatment or disposal
facilities.
1617 MAIL SERVICE CENTER, RALEIGH, NORTH CAROLINA 27699-1617 -TELEPHONE [phone]/FAX [phone]
AN EQUAL OPPORTUNITY AFFIRMATIVE ACTION EMPLOYER - 50% RECYCLED/ 10% POST -CONSUMER PAPER
VISIT US ON THE WEB AT http://h2o.enr.state.nc.us/NPDES

0
Mr. Oreskovich NCO086932
Page 2 of 3
The Washington Regional Office, telephone number [phone], shall be notified at least
forty-eight (48) hours in advance of operation of the installed facilities so that an in-place inspection
can be made. Such notification to the regional supervisor shall be made during the normal office
hours from 8:00 a.m. until 5:00 p.m. on Monday through Friday, excluding State Holidays.
Upon classification of the facility by the Certification Commission, the Permittee shall employ a
certified water pollution control treatment system operator to be in responsible charge (ORC) of the
water pollution control treatment system. The operator must hold a certificate of the type and grade at
least equivalent to or greater than the classification assigned to the water pollution control treatment
system by the Certification Commission. The Permittee must also employ a certified back-up operator
of the appropriate type and grade to comply with the conditions of Title 15A, Chapter 8G, .0202. The
ORC of the facility must visit each Class I facility at least weekly and each Class I1, I1I, and IV facility
at least daily, excluding weekends and holidays, and must properly manage and document daily
operation and maintenance of the facility and must comply with all other conditions outlined in Title
15A, Chapter 8G, .0204. Once the facility is classified, the Permittee must submit a letter to the
Certification Commission which designates the operator in responsible charge within: (A) Sixty
calendar days prior to wastewater being introduced into a new system or (B) within 120 calendar days
of the following, (i) after receiving notification of a change in the classification of the system requiring
the designation of a new ORC and back-up ORC or (ii) a vacancy in the position of ORC or back-up
ORC.
A copy of the approved plans and specifications shall be maintained on file by the Permittee for
the life of the facility.
The Operational Agreement between the Permittee and the Environmental Management
Commission is incorporated herein by reference and is a condition of this Permit. Noncompliance with
the terms of the Operational Agreement shall subject the Permittee to all sanctions provided by G. S.
143-215.6 for violation of or failure to act in accordance with the terms and conditions of this Permit.
Failure to abide by the requirements contained in this Authorization to Construct may subject
the Permittee to an enforcement action by the Division of Water Quality in accordance with North
Carolina General Statute 143-215.6A to 143-215.6C.
The issuance of this Authorization to Construct does not preclude the Permittee from complying
with any and all statutes, rules, regulations, or ordinances which may be imposed by other
government agencies (local, state, and federal) which have jurisdiction.
Upon completion of construction and prior to operation of this permitted facility, a certification
must be received from a professional engineer certifying that the permitted facility has been installed
in accordance with the NPDES Permit, this Authorization to Construct and the approved plans and
specifications. Mail the Certification to the NPDES Unit, Division of Water Quality, 1617 Mail Service
Center, Raleigh, NC 27699-1617.
One (1) set of approved plans and specifications is being forwarded to you. If you have any
questions or need additional information, please contact Ms. Susan A, Wilson, telephone number (919)
733-5083, extension 510.
Sincerely,
COPY
Kerr T. Stevens
cc: Central Files
NPDES Unit - Permit File
Washington Regional Office, Water Quality
Technical Assistance and Certification, Tony Arnold
Ed Lawler Hobbs. Upchurch & Ass.
2522 S. Croatan Hwy. Suite 2A. Nags Head. NC 27959

RE: Tyrrep
Subject: RE: Tyrrell
Date: Wed, 25 Jul 2001 11:46:36 -0400
From: Ed Lawler <[e-mail]>
To: "'Susan Wilson"' <[e-mail]>
Ms. Wilson,
Fax # is [phone]. Line is open now.
Thanks,
Ed
-----Original Message -----
From: Susan Wilson [mailto:[e-mail]]
Sent: Wednesday, July 25, 2001 11:43 AM
To: Ed Lawler
Subject: Re: Tyrrell
Thanks for the info. I issued this today (wed.) and tried to fax to you -
it
did not go through - something on your end. It may be next week before you
get a hard copy - let me know what you'd like done.
Ed Lawler wrote:
> Ms Wilson,
> There are 4400 ln. ft of discharge line up to the area of the directional
> bore out to Bulls Bay. According to the specifications for the project,
Sec
> 6,0.9 Relationship of Water Mains to Sewers; water and sewer mains shall
> have 10' of horizontal separation, if crossing water over sewer there
shall
> be at Ieast 18" separation or 101of ferrous pipe for both the water and
> sewer on each side of the crossing, for water main crossing under the
sewer
> there shall be at least 10' of ferrous pipe for both water and sewer
> regardless of the vertical distance.
> This is in accordance with PWS rules and regulations.
> If there is any other information I can help you with please let me know.
> Regards,
> Ed
> -----Original Message-----
> From: Susan Wilson [mailto:[e-mail]]
> Sent: Tuesday, July 24, 2001 3:00 PM
> To: [e-mail]
> Subject: Tyrrell
> Ed,
> What's the total linear feet of 6" line prior to the directional bore?
> Also, does PWS allow sewer/discharge lines to be above water supply
> lines? I don't see that in our rules - 2H .0219(1) (2) (G) (ii)
1 of 1 7/25/013:07 PM

RE: Tyrrell
Subject: RE: Tyrrell
Date: Tue, 24 Jul 2001 15:27:17 -0400
From: Ed Lawler <[e-mail]>
To: "'Susan Wilson"' <[e-mail]>
Ms Wilson,
There are 4400 ln. ft of discharge line up to the area of the directional
bore out to Bulls Bay. According to the specifications for the project, Sec
6,0.9 Relationship of Water Mains to Sewers; water and sewer mains shall
have 10' of horizontal separation, if crossing water over sewer there shall
be at least 18" separation or 10'of ferrous pipe for both the water and
sewer on each side of the crossing, for water main crossing under the sewer
there shall be at least 10' of ferrous pipe for both water and sewer
regardless of the vertical distance.
This is in accordance with PWS rules and regulations.
If there is any other information I can help you with please let me know.
Regards,
Ed
-----Original Message -----
From: Susan Wilson[mailto:[e-mail]]
Sent: Tuesday, July 24, 2001 3:00 PM
To: [e-mail]
Subject: Tyrrell
Ed,
What's the total linear feet of 6" line prior to the directional bore?
Also, does PWS allow sewer/discharge lines to be above water supply
lines? I don't see that in our rules - 2H .0219(i)(2)(G)(ii)
to l
1 of 1 7/24/014:07 PM

Submissions:
• Letter of 'I)ransmittal
• Engineering Plans / Specs
• Separate stamped & signed submittal for diffuser
Wastewater Line (from RO plant):
4400 linear feet of 6" HDPE pipe
(must maintain minimum separations required by 15A NCAC 2H .0219(1) (2))
125 linear feet directional bore (bored to a point 100 ft. from shoreline)
Diffuser - 10' with 8, 4" check valves; concrete anchor
Review Notes: Specifications/plans indicate minimum separations required by PWS; per Ed
Lawler (HUM), PWS does allow water mains under sewer if ferrous pipe; other specs with regard
to minimum separation concur with 15A NCAC 2H .0219(I)(2)(G)(ii).
I'll specify this requirement (which includes minimum 3' cover in trafficked areas)
Because line is directionally bored and diffuser is anchored - OK that this will be secure from
washout - may require minimum of annual inspection.
Pte- (z,.. C. (744"t) t) - W
Page 2
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ATC SUMMARY
SCOPE
Tyrrell County RO WTP Discharge
Tyrrell County, NC
ATC No. 086924ACA
Bull Bay/Albemarle Sound, SB
Pasquotank River Basin, 030153
Tyrrell County
The scope of the project includes the installation of an effluent discharge line from the RO WTP to
Bull Bay. The line into Bull Bay will include an effluent diffuser.
REVIEW SUNM ARY
Executive Summary
The subject facility received an NPDES permit March 23, 2001. This is a new facility and nothing
yet has been constructed. Many comments were received from DMF regarding the discharge of
reject wastewater from the RO plant.
Project Number: HUA'IY-0001 - Permits
Applicant:
Mr. J.D. Brickhouse, County Administrator
P.O. Box 449
Columbia, NC 27925
Application/Plans Prepared by:
Eric Weatherly, P.E.
HU&A
2522 S. Croatan Hwy., Suite 2A
Nags Head, NC 27959
Project Location:
Tyrrell County
Outfall:
Latitude: 350 56' 16"
Quadrangle: C29SW, Columbia West
Facility status: New
Wastewater source: " Industrial "
Longitude: 760 21' 18"
Do Land Disturbing Activities Exceed One Acre: t,5 t C -C SPC I G t e-0 rn( SF rCS
Additional Permit Requirements: CAMA
SEPA Requirements:
Is an EA required? No - not for wastewater.
Funding Source: Public - through PWS/Robin Peele
Estimated Project Schedule:
To start construct immediately upon receiving the ATC
Page 1

14'1y: i
DIVISION OF WATER
April 10, 2001
MEMORANDUM
To: David Goodric,...Supervisor
OO'NPDES Unit
Attn: Susan Wilson, Environmental Engineer
NPDES Unit
Through: Roger K. Thorpe Regional Engineer
Washington Regional Office
From: Al Hodge, Environmental En inee
Washington Regional Office
Subject: NPDES-NC0086924
ATC #086924ACA
Tyrrell Co. RO-WTP
Tyrrell County
Q
LApRID
12 2001TYENR -WATER QUALITY
POINT SOURCE BRANCH
Hobbs, Upchurch & Associates, P.A. in behalf of Tyrell
County have submitted a request to construct a discharge line and
diffuser. The project consists of approximately 4,407 if of
discharge line, a diffuser. The reject will be discharge by
gravity at a rate of 100 gallons per minute(phase I) and 200
gallons per minute (phase II)
It is recommended the ATC be issued.

Hobbs, Upchurch & Associates, P.A.
Consulting Engineers
2522 S. Croatan Highway • Suite 2A • P.O. Drawer 1929 • Nags Head, North Carolina 27959
February 14, 2001
Al Hodge
Environmental Engineer
NCDENR
Division of Water Quality Ka?
943 Washington Square MallWashington, NC 27889
RE: Authorization to Construct
Stumpy Point Water Treatment Facility Stumpy Point Water and Sewer District H
Dare County, NC
HUA No.: DR0004 —Permits
Dear Mr. Hodge:
Please find enclosed three sets of plans and specifications for a discharge pipe with diffuser
header into Stumpy Point Bay for the above referenced project. The Stumpy Point reverse
osmosis water treatment plant (RO WTP) will have a capacity of 42 gallons per minute of treated
water. A draft discharge permit has been received from the NPDES Unit and the Public Notice
period is expected to be completed in the first part of March.
Discharge flows from the RO WTP are expected to be 20.5 gallons per minute. A 4 -inch water
main will extend from the water treatment facility to the shoreline of Stumpy Point Bay. The
three sets of included plans illustrate the location of the 4 -inch water main as well as the water
line details to be required of the pipeline contractor. From the shoreline, a 4 -inch polyethylene
pipe will be directionally bored into Stumpy Point Bay to a point 100 feet from the shoreline. A
10 -foot section of polyethylene pipe will be anchored to the bottom of the sound and will
incorporate four 3 -inch rubber check valves for dispersion and dilution. The check valves will
be installed at an angle to prevent erosion to the sound floor as well as to prevent surface
turbulence. The included specifications provide the specifications and details for the
directionally bored portion of the project and the discharge header. Also included are two sets of
the Engineering Alternatives Analysis information as sent to the NPDES Unit for your review.
Nags Head, NC • Telephone [phone] • Fax [phone] • e-mail: info@ hobbsupchurch.com
Southern Pines • Myrtle Beach • Raleigh • Charlotte

Al Hodge
HUA No.: DR0004 — Permits
February 14, 2001
Page 2
The $400.00 processing fee will be forwarded to you under separate cover from Dare County.
We appreciate your assistance in this matter. If you have questions or if additional information
is needed, please do not hesitate to contact me.
Sincerely,
HOBBS, UPCHURCH & ASSOCIATES, P.A.
ce5"�- J
Eric T. Weatherly, P.E.
Division Manager
ETW/hb
Enclosures
Cc: Bob Oreskovich, Utilities Director, Dare County Water Department
Susan Wilson, NPDES Unit
H: IDARECOW"WR000JSnWYPOINT CO6Na ffWATERSYS7FAAJo0PEW13WCDfJY WA7ERQUAfJMODGEdoc

Hobbs, Upchurch & Associates, P.A.
Consulting Engineers
2522 S. Croatan Highway • Suite 2A • P.O. Drawer 1929 • Nags Head, North Carolina 27959
February 13, 2001
J.D. Brickhouse flHL' FEB 22 2001 Ll1
County Administrator I
Tyrrell County ABY —1O __
P.O. Box 449
Columbia, NC 27925 I� _
RE: Authorization to Construct
Tyrrell County Reverse Osmosis Water Treatment Plant 7 2001 iJ
Tyrrell County, NC
HUA No.: TY0001 —Permits
QUALITY
t rtAfa.H
Dear J.D.: _
Please find enclosed for your files a copy of the Authorization to Construct application for the
above referenced project. This application requires a $400.00 processing fee. Please send a
check in this amount made payable to NCDENR to the attention of:
Al Hodge, Environmental Engineer
NCDENR — Division of Water Quality
943 Washington Square Mall
Washington, NC 27889.
Your assistance in this matter is appreciated. Please do not hesitate to contact me with
comments or questions.
Sincerely,
HHOOB'BS, UPCHURCH & ASSOCIATES, P.A.
Eric T. Weatherly, P.E.
Division Manager
ETW/hb
Enclosure
II:17TIM1 C'OUNI117Y000I Irarer S)Yrem ImprmrmeM.vIJOO PF-WT31310 PFJUOI' AI'PI K.'AI70N.SURMI7TAL INFOIbILII'IONW.C. D1TAR77NFN7'Or FA471RONW.NT AND
NATURAL RERNIRCU IVA1 ER Q11AUTIIRRICKHOMF_dx
Nags Head, NC • Telephone [phone] • Fax [phone] • e-mail: into® hobbsupchurch.com
Southern Pines 9 Myrtle Beach • Raleigh • Charlotte

Hobbs, Upchurch & Associates, P.A.
Consulting Engineers
IqJ2522 S. Croatan Highway • Suite 2A • P.O. Drawer 1929 • Nags Head, North Carolina 27959
February 13, 2001
Al Hodge
Environmental Engineer
NCDENR
Division of Water Quality
943 Washington Square Mall
Washington, NC 27889
RE: Authorization to Construct
Tyrrell County Reverse Osmosis Water Treatment Plant
Tyrrell County, NC
HUA No.: TY0001 —Permits
Dear Mr. Hodge:
FEB 14 2001
Aim
Please find enclosed three sets of plans and specifications for a discharge pipe with diffuser
header into the Albemarle Sound for the above referenced project. The Tyrrell County reverse 0'(06
osmosis water treatment plant (RO WTP) will have a capacity of 300 gallons per minute and will
be expandable to 600 gallons per minute. A draft discharge permit has been received from the
NPDES Unit and the Public Notice period is expected to be completed in the first part of March.
Discharge flows from the RO WTP are expected to be 75 gallons per minute initially and 150
gallons per minute when the plant is expanded. A 6 -inch water main will extend from the water
treatment facility to the shoreline of the Albemarle Sound. The three sets of included plans
illustrate the location of the 6 -inch water main as well as the water line details to be required of
the pipeline contractor. From the shoreline, a 6 -inch polyethylene pipe will be directionally
bored into the Albemarle Sound to a point 100 feet from the shoreline. A 10 -foot section of
polyethylene pipe will be anchored to the bottom of the sound and will incorporate eight 4 -inch
rubber check valves for dispersion and dilution. The check valves will be installed at an angle to
prevent erosion to the sound floor as well as to prevent surface turbulence. The included
specifications provide the specifications and details for the directionally bored portion of the
project and the discharge header. Also included are two sets of the Engineering Alternatives
Analysis information as sent to the NPDES Unit for your review.
Nags Head, NC • Telephone [phone] • Fax [phone] • e-mail: into@ hobbsupchurch.com
Southern Pines 9 Myrtle Beach • Raleigh • Charlotte

Al Hodge
HUA No.: TY0001— Permits
February 13, 2001
Page 2
The $400.00 processing fee will be forwarded to you under separate cover from Tyrrell County.
We appreciate your assistance in this matter. If you have questions or if additional information
is needed, please do not hesitate to contact me.
Sincerely,
HOBBS, UPCHURCH & ASSOCIATES, P.A.
Eric T. Weatherly, P.E.
Division Manager
ETW/hb
Enclosures
Cc: J.D. Brickhouse, Tyrrell County Administrator
Susan Wilson, NPDES Unit
H: ITYRRELL C0UN7YI7YO001 Water System /mprormentsl3OO PERW7SI3T0 PERMIT APPLICA77ON-SUBM/TTAL /NFORM477ONW.C. DEPAR MOOT OF ENVIRONMENT AND
NATURAL RESOURCESIWATFR QUALI7YWODGEdoc

I
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qJ2522
Hobbs, Upchurch& Associates, P.A.
Consulting Engineers S. Croatan Highway • Suite 2A • P.O. Drawer 1929 • Nags Head, North Carolina 27959
November 15, 2000
Susan A. Wilson
NCDENR
Division of Water Quality
NPDES Unit
1617 Mail Service Center
Raleigh, NC 27699-1617
RE: NPDES Permit Applications
Information Request/Reverse Osmosis
Tyrrell County RO Plant
NPDES Permit No. NCO086924
HUA No.: TY0001 — Permits
Dear Ms. Wilson:
'i FEB 14 2001
Li
IBy
Reference is made to your letter dated October 26, 2000 requesting additional
information for the above referenced project. The following information is provided in
reference to your comment letter regarding the Tyrrell County project.
Before addressing your specific comments, I wish to provide additional background
information. The original project was conceived in early 1999 and was proposed as a 300
gallon per minute pressure filtration and ion exchange softening plant utilizing waters
from the surficial aquifers. A Preliminary Engineering Report (PER) was written based
on this concept and grant applications were made for the newly passed Clean Water Bond
Funds and the N.C. Rural Economic Development Center. During the funding
application stages and as more and more data was collected in the region, it was the
primary concern of the County Commissioners to not install a conventional treatment
plant utilizing the surficial aquifers but instead to install a reverse osmosis water
treatment plant into the Castle Hayne aquifers. The reasoning was that the surficial
aquifers in the region are very limited in quantity and also tend to deteriorate over time in
quality primarily through upconing of chlorides from the lower aquifers. This is
presently being experienced at the County's existing plant just south of Columbia.
Reverse osmosis treatment technology is the only available technology to treat chlorides
and should be capable of meeting future regulations as they become more strenuous.
Nags Head, NC • Telephone [phone] • Fax [phone] • e-mail: info@ hobbsupchurch.com
Southem Pines • Myrtle Beach • Raleigh • Charlotte

Susan A. Wilson
HUA No.: TY0001—Permits
November 15, 2000
Page 2.
The discharge for the conventional treatment process included backwash water from the
pressure filters and a brine solution from backwash of the ion exchange softening vessels.
This discharge was to be into the Scuppernong River. The PER contained in the attached
Engineering Alternatives Analysis (EAA) indicates the location of the original discharge.
Before converting the project to a reverse osmosis treatment technology, discussions with
the Division of Water Quality indicated that the Scuppernong River would not be suitable
for a reverse osmosis discharge and that the Albemarle Sound should be utilized. This
change has been approved by the funding agencies and we have since proceeded with the
application for a discharge into the Albemarle Sound. Additional background
information can be seen in various attachments to the EAA.
In addition to the change from conventional treatment to reverse osmosis treatment, the
Commissioners have asked us to size the plant to allow for future expansion. The first
phase of the plant is to be 300 gallons per minute as is documented in the NPDES permit
application. It is the desire of the Commissioners to allow for a future phase of the plant
for a total of 600 gallons per minute. This will allow the County to supplement the
existing water plant with water. The existing water plant is approximately 30 years old
and the wells are experiencing reduced flows and reduced water quality due to upconing
of chlorides. Secondly, a test well has now been dug at the actual treatment plant site and
samples taken from the aquifers to be utilized for the project. The results indicated that
the plant could be designed for an 80% recovery instead of the 75% recovery in the
original NPDES application. This means that an additional 5% of the water can be used
as potable water and the discharge amount is reduced by 5%. For example, the original
concept of 75% would result in wells that produce 400 gallons per minute with 300
gallons per minute as potable water and 100 gallons per minute as concentrate discharge.
At 80% recovery, the project will now utilize 375 gallons per minute wells with 300
gallons per minute of potable water and 75 gallons per minute of discharge water. In the
future when the plant is expanded, the discharge will increase from 75 gallons per minute
to 150 gallons per minute.
The result of the above discussion is that the NPDES permit needs to be changed from
100 gallons per minute discharge to a 75 gallon per minute discharge with a future
expansion to 150 gallons per minute discharge. Please let us know how we can handle
this change and what information or changes we need to make to the discharge permit
application.
XMAKDKpmjeats%TYRRELL C04LWMTYOOOI water System Impmv menta= PER%I1TSU1.0 PER.NIT APPLICATION-SUMMAL INFOMLAMMN.C.
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Susan A. Wilson
HUA No.: TY0001—Permits
November 15, 2000
Page 3
1. Item number 1 of your comment letter requests an Engineering Alternatives
Analysis Report. Please find this report attached as requested.
2. As previously discussed, an actual test well has now been performed at the
proposed water treatment plant site. The test well was constructed in early
October 2000, samples were collected on October 4, 2000, and the analysis was
received on October 25, 2000. The test well determined there were two water
bearings stratas in the area and are located at depths of 100-150 feet for the first
bearing strata and a depth of 405480 feet for the second bearing strata. We
believe these stratas to be the Yorktown aquifer and the Castle Hayne aquifer
respectively. Attached for your use is the laboratory analysis of the constituents
from each aquifer. We propose to utilize the deep well strata or the Castle
Hayne for our reverse osmosis project. This aquifer had better yields and
should meet the future quantity needs of the project. Based on the deep aquifer,
a computerized reverse osmosis design program was utilized to project the
concentrate discharge for the project. Also attached for your use is a copy of
the program that illustrates the quality of the discharge. The results can be seen
on the second page listed under concentrate. The concentration of metals listed
in the raw water analysis can be converted to the discharge parameters by
multiplying by a factor of 5. For example, if copper and zinc were 0.005
milligrams/liter in the raw water, the discharge would be 0.025 milligrams per
liter. However, both copper and zinc were below detectable limts.
3. Item number 3 does not specifically apply to Tyrrell County; however, it is
pointed out that according to the computerized model, the pH of the discharge
will be 7.88.
4. The sounds in northeastern North Carolina are naturally shallow. At the point
of discharge, the depth ranges between 3-4 feet and fluctuates with the wind
tides. From our experience with the same discharge header at the Cape Hatteras
water treatment facility, the discharge header arrangement proposed creates
very little disturbance at the surface even in two feet of water. At the low flows
we are proposing at this water treatment facility, no disturbance would be seen
in two feet of water or greater. The arrangement of the discharge head also is
such to create no scouring to the sound floor.

Susan A. Wilson
HUA No.: TY0001—Permits
November 15, 2000
Page 4
Please note that the drawings for the discharge contained in the EAA have been
revised to indicate a depth of three feet rather two feet based on actual field
measurements. To reach a depth of six feet of water, the pipeline would have to
be extended 1,600 .feet. It is our experience and opinion that this discharge
header in three feet of water wouldprovide adequate dispersion and dissolution
as well as minimize any surface turbulence and sound bottom scouring.
If you have any questions or if additional information is needed, please do not hesitate to
call.
Sincerely,
HOBBS, UPCHURCH & ASSOCIATES, P.A.
,wl!
Eric T. Weatherly, P.E.
Division Manager
ETW/hb
Attachments
Cc: J.D. Brickhouse, Tyrrell County Administrator
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DEPARTMENT OF EIYiRONWNT AND NATURAL RESOURCESIWATER QUALITY\NPDES PEMf>'I1FAMWILSON.doe

Environmental Chemists, Inc.
6602 windmill wry - Wilminjton. North CArnfina 21405
(910) 392-=23 (Lab) - [phone] (F...x )
CONSULTING ELAGmW�rolcoct
CHEMISTS NCDENR: D WQ CERTIFICATE s94. DLS CERTIFICATE #37729.
Customer:
SKIPPER'S NVELL DRILIANG batt of Report. October 25, 2000
P.O. J30N I
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Atte: Chariie Skipper x ,
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Report R Number: 0-3495
- REPORT OF ANAL- YS -
Date Conectcd: 10/04/00
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Kaagancsc, Nin ma/L
Pp, mg/1,
-hlcride, 0 - mom,
luarndc, F- rmzlL
Report To: Charlie Skipper
Project: TyrtR County Wags
PA c 1 OT 2
Deep Weil
# 836.6
< O.S
43.4
0
0
411
138
273
55.3
7
18.6
4522
0.030
75.3 '
< 0.005
< 0.005•
< 0.02
1375
0.86
Shinow Wee
# 8367 '
< 0.5
31j
0
0
283
235
48
94.0
12
23.3
708
1.28
9.69
< 0.003
0.076
0.13
52.9
0.22
10/25/00 16:32 TX/&X N0.9101 - P.002 E

Environmental Chemists, Inc.
660 Windmill Way • Wilmirizaw. North CGralirn :d•105
[phone] (Lab) • (910) (F:kx )
Fthem W 0201 -COM
CONSULTING
CNcM:STS NCDE-NR: Dw'Q CERTMCATE *94. DLS C=itTIFICATE *37729 -
Customer: Sidpper's Well iDrMing Report 0-3495 Page 2 of 2
WATER.
Sample LD
Deep well
# 8366.
Shallow LN'cl1
08367
)Titrate Nitrogen, NO -,-N =g/L
0.045
0.075
tint, Zn in &/L
< 0.005
<0.1
< 0.005
< 0.1
Chlorine (Fret. C4) rug/1.
Ammonia as NH4 mgfL
3.4
0.6
$.ariara, Ba_amg/L
0.030
0.025
Hydrogen Sulfide as N_ 2S
0.04
16.7
< 0.01
16.7
Tempera ture as • C
Lea d 2 s Pb mgJL
0.019
0.014
+0.33
Corrosi v en eys
+0.72
PH, units
8.11
7.73
pHs, ani to
7,39
1.75
7.44
5.80
Turbidity as N.T.U.
Total Sm"ndcd Sofid.s, 'I SS m:g/L
Total IAsadved Solids, TDS mgfL
( 2674
63
455
< 2
Sal!>,te :s 50, tngJL
soli mw >, j 1\ a mgfl.,
828
40.4
Salo d e a3 S MgfL
0.4
< 0.01
Foul Organic Carbon as TOC wgfL
3.3
6.4
77LI FP
FELM POTENTIA L at pH
.lo -trine residual :ftu incubation
-hloroform µ&,rL
arc mof0rm µg/L
'hi arod�"brOtnomethane }cgfL
trOmod c!hlorO=ethane Pg/L
7P AgfL ( xs Chloroform) —
TP µ.1.1o1m7 L = TFP Kg. L, ss Chloroform
119
:yam:
10/25/00 16:32 TX/RX N0.9101 P.003 . M

Fluid systema Cozporatioa
Project: Tyrrell Coauty,
prev"*d my: Jon
PRo,7r�eT sv�aa►nz
ROPRO Ver. 6.1 -Cl? Date: 08 -Nov -2000
Desori� : w/o WA"r 80% ren.
%V": Single Pass Design
,. Fluid 'Sp"mij
RO Rea�vary i13/i] 80.00 Overall B"tem ]IOaa 917/(4+23)] 80.01
Design'Temperaturo m 16.7 Dag C
PASS 1
Azzm7 ReooTery 113/41 •• s 00.06
Xlenant Age • 0.00 Years
Fouling Allowance (FA) 0.0$
Tubes Slams RV9
Bank Klement 'Type
/Bank /Tube
:lux
MM
I TM 8822MR-365
8 7
15.0
2 TM 862& LP -365
4 7
12.3
system/Pass Total
14.1
presawre rlon Rata
TDO 100C
Race""
ChlorLdm
With rA
Otte" (Haig)
(VSGnQ
(sg/L)
(Ca 3)
(mq/L)
1 0.0
373.0
2743.73
411.1
3375.0
4 0.0
373.0
2745.73
411.1
1373.0
a 215.3
375.0
2165.28
411.1
1373.0
13 0.0
300.0
69.76
2.1
30.5
14 0.0
300.0
69.76
2.1
30.5
16 0.0
300.0
69.76
2.1
30.5
`16 193.3
75.0
13547.49
2046.9
6752.9 �ISCMARGE
11/08/00 16:08 TX/RX N0.9244 P.002 0

a iww oY� arra. w�Gyvs��.+v.•
Pro:)acts Tyrrell County, NC
Prepared Dy: jam
ARVAT SUiarja - SULKS 1
P+wzaaata Flow
Pass A.00raCY
2nlwt Fres w/o !A
t^aat tram whM
!lank
XISE Mt TXP..
1
27+C 8622EA-365 - ,_ .
2
TFO 882UMV-365 '.
M
(8)
8
Total Stab.
Bank
re" rsed
(am (atm
1
97.5.0 46.9
2
1.62.7 40.7
system
2.097
300.0 IJBWX
90.08
215.3 psiq
215.3 Psiq
DascriPti Vo blend, 808 roe.
922s--. Single Pass D"Ign
Fowl26.7 ing Juloowence) (1A) / 0.00 Dog C
Cons. Pres W/o TA 183.3 Psig
Tabes sly
F.1ews
/Sank
/Stab+
/Bank
(0)
M
(8)
8
7
56
4
7
28
Total
• Tube
Cana.
..Cana.
sa:.eeura
(PsiQ)
162.7
20.3
75.2
18.8
fiat re"
straau xabar 4
Coasaantratiosn (sssg/L)
Ca++
No++
NA+
R+
NR4+
sr++
Say-+
CO3--
3M -
604--
Cl-
X03-
r-
Si02
CO2
Suss of roes
TD8 (180 C)
P3
Sardnass (as Ca003)
Oen Prsssnra (Ps3.q')
2.sagliar ZDA&Z
Stiff -Davis Z>adax
55.30
66.29
828.00
75.30
3.40
0.00
0.03
0.03
0.00
0.00
529.09
63.00
1375.00
0.05
0.96
18.60
7.75
3014.95
2745.73
5.10
411.09
29.01
0.93
0.63
u.�
(Zr)
0.00
0.00
boost
Maasifold PMZas bas=k
30ra6sustw
Y.as�s
sa:.eeura
(PsiQ)
15.0
215:3
12.3
197.6
0.0
0.0
0:0 °'-
Avg
Xnlat
FXV
Pros
0")
(POW
15.0
215:3
12.3
197.6
14.1 pas�M �c,c ;..r�.;..
ito rnlet :sweat. �.
5 13
•.i ! Y
NOW
55.30
66.29
029.00
75.30
3.40
0.00
0.03
0.03
0.00
0.56
464.43
113.74
1375.00
0.05
0.96
18.60
54.01
3001.59
2765.28
7.20
411.09
26.77
-0.13
-0.13
275.35
330.08
4041.68
364.98
15.86
0.00
0.13
0.15
0.00
2.90
2241.51
566.9'
6752.$9
0.23
4.26
91.13
54.01
14688.04
13547.49
7.89
2046.91
140.78
1.95
1.27
0.34
24.58
2.88
0.29
0.00
0.00
0.00
0.00
0.00
20.24
0.44
30.53
0.01
0.01
0.47
33.93
80.06
69.76
5.84
2.13
0.77
-5.29
Nsmbran* data !il• versions J=Z12-00
Plsasa raviaa the Draslgsa ]iotas i W&rnjugm p&" atumbod.
Conoantrate azaaads solubility ii"t - aM waszsings sheat.
11/08/00 16:08 TX/RX N0.9244 P.003
Avg
'
IADP
.5iisat
: _DP
. S 481116 tit
(Psiq)
(pa")
fit
157.9
17.6
2.097
83.2
14.3
1.037
4... r.,.
14.1 pas�M �c,c ;..r�.;..
ito rnlet :sweat. �.
5 13
•.i ! Y
NOW
55.30
66.29
029.00
75.30
3.40
0.00
0.03
0.03
0.00
0.56
464.43
113.74
1375.00
0.05
0.96
18.60
54.01
3001.59
2765.28
7.20
411.09
26.77
-0.13
-0.13
275.35
330.08
4041.68
364.98
15.86
0.00
0.13
0.15
0.00
2.90
2241.51
566.9'
6752.$9
0.23
4.26
91.13
54.01
14688.04
13547.49
7.89
2046.91
140.78
1.95
1.27
0.34
24.58
2.88
0.29
0.00
0.00
0.00
0.00
0.00
20.24
0.44
30.53
0.01
0.01
0.47
33.93
80.06
69.76
5.84
2.13
0.77
-5.29
Nsmbran* data !il• versions J=Z12-00
Plsasa raviaa the Draslgsa ]iotas i W&rnjugm p&" atumbod.
Conoantrate azaaads solubility ii"t - aM waszsings sheat.
11/08/00 16:08 TX/RX N0.9244 P.003

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N ��• 1 .

I.
ENGINEERING ALTERNATIVES ANALYSIS
TO EVALUATE WASTE DISPOSAL ALTERNATIVES
Tyrrell County RO Plant
NPDES No. NCO086924
GENERAL INFORMATION
A. Basic Identification Information
► Facility Name: Tyrrell County Reverse Osmosis Water Treatment Plant
► County: Tyrrell
► Facility Address and Telephone Number:
The proposed water treatment plant has not been constructed and therefore
does not have a physical address or telephone number. Attachment 1 to this
report contains a location map for the proposed RO plant. The following is
the mailing address and telephone number of the point of contact with the
County:
J.D. Brickhouse, County Administrator
Tyrrell County
108 S. Water Street
P.O. Box 449
Columbia, NC 27925
[phone]
P. EAA Preparer's Name, Address, and Telephone Number:
Eric T. Weatherly, P.E.
Hobbs, Upchurch & Associates, P.A.
P.O. Drawer 1929
Nags Head, NC 27959
[phone]
B. Proiect Description
Attachment 2 of the study contains a Preliminary Engineering Report (PER),
which was prepared in March of 1999. This study outlines the need for the
project, its sizing, location, and treatment process. In the PER, the treatment
process outline utilized conventional treatment consisting of pressure
filtration and ion exchange softening. Backwash water from the pressure
filters and the brine backwash from the softeners were to be discharged into
the Scuppernong River.
As the project proceeded, the Owners and Engineers began to realize the
problems associated with the shallow aquifers in the region and utilization of

Fol
conventional treatment in these shallow aquifers. Conventional treatment
was adequate for the shallow aquifers; however, there are major problems
with ample supply of water from these aquifers as well as a change in water
quality over a period of time primarily due to an upconing of chlorides from
the lower aquifers. It was determined that reverse osmosis treatment would
be best suited for this northeastern county with utilization of the deeper
aquifers where was sufficient quantity to meet future demands. The reverse
osmosis treatment will meet the long term changing regulations as well as be
able to treat the higher chlorides in the low aquifers. Attachment 3 to this
report contains an updated scope of the project.
As a result of the change in treatment process from conventional to reverse
osmosis, discussions were held with the Division of Water Quality to
discharge into the Scuppemong River. As a result of discussions, it was
determined it would be feasible to locate the discharge in the Albemarle
Sound in lieu of the Scuppemong River. Attachment 4 contains a location
map of the proposed discharge into the Albemarle Sound. Attachment 5
contains a letter from the Division of Water Quality indicating the feasibility
of discharge into the Albemarle Sound.
The PER in Attachment 2 illustrates the flow calculations for the water
treatment plant. It is anticipated that the RO plant will have a 25%
concentrate discharge; therefore, based on a supply of 400 gallons per
minute, 300 gallons per minute will be potable minute and 100 gallons per
minute will be discharged into the Albemarle Sound.
Existing Facilities
Existing facilities will not be a part of this project.
Proiect Phasing
The initial phase of the project will be a 300 -gallon per minute RO plant. The
pipeline and building will be sized to allow future expansion of the treatment
process. The components of the facility will be sized to allow a future RO train to be
added to increase capacity from 300 gallons per minute to 600 gallons per minute. If
the building is properly sized, the addition of a RO train will be an easy addition in
the future. _.
It is not foreseeable that the growth of the County will require expansion of the plant
in the near future. It is more expected that the schedule for expansion of the
proposed plant will be dependent upon the life expectancy of the existing water
treatment plant located south of Columbia on N.C. Highway 94. The existing plant
is approximately 30 years old and is in need of major repairs and renovations. In
addition, the quality of the groundwater in the wells is deteriorating rapidly due to

II.
intrusion of chlorides as well as a loss in flow capacity. Due to a lack of a discharge
in the area of the existing plant, reverse osmosis is not an alternative at this location.
With expansion of the proposed RO plant from 300 gallons per minute to 600
gallons per minute, the discharge would proportionally increase from 100 gallons per
minute to 200 gallons per minute or 144,000 gallons per day to 288,000 gallons per
day.
EVALUATE DISPOSAL ALTERNATIVES
A. Connecting to a Sewer Collection System -
The nearest publicly or privately owned sewage treatment facility is located in the
Town of Creswell. This facility is approximately 7 miles from the proposed Tyrrell
County RO plant. The Town of Creswell's sewer facility is a lagoon system.
The distance to this sewage treatment facility will be much more expensive than a
discharge to the Albemarle Sound and is outside of the 5 mile radius of consideration
for the EAA. It is also pointed out that the chloride' concentrations of reverse
osmosis treatment plant discharges are too high to be processed in any type of
biological sewage treatment facility. The RO discharge would quickly upset the
treatment process and render the facility useless.
In addition, there are no plans for future sewage treatment facilities within a 5 -mile
radius within 5 years, public or private, in the area.
B. Land Based Disposal
Land application is not a feasible alternative for the disposal of RO concentrate.
Chloride levels in the RO concentrate would quickly kill plant life on land surfaces
including trees and grasses. Concentrate discharge from the RO plant is expected to
in the range of 6,000 ppm of chlorides. Typical land based plant life can withstand
chloride levels up to approximatley 1,100 ppm of chlorides.
There is an insufficient amount of suitable land in the area to land apply RO
concentrate. In addition, the cost for installation would be very high. As an
example, assuming a loading rate of 0.4 gallons per day/square foot would require
23 miles of drain lines or approximately 50 acres of land for the initial phase of the
RO plant.
C. Wastewater Reuse
Due to the chloride concentrations of the wastewater, wastewater reuse is not an
option for options such as land application.

D. Surface Water Discharge
1. The Albemarle Sound does not have an associated 7Q10 or 30Q2 flow.
2. Tertiary filtration on reverse osmosis concentrate will not provide quality
improvements.
3. Attachment 6 to this report contains plans and specifications of the discharge
piping for the project.
4. Land Easement Agreements
Attachment 7 contains information available to date on the land and
easements necessary to construct the discharge pipe.
5. Present Value of Cost Analysis
Attachment 8 to this report contains the present value of cost analysis for the
discharge pipe.
E. Disposal Combinations
=` The proposed discharge of the R4 concentrate into the Albemarle Sound is the only
feasible alternative for the project.