NC0089435_Permit Issuance_20140303

40
CHUM
North Carolina Department of Environment and Natural Resources
Division of Water Resources
Water Quality Programs
Pat McCrory Thomas A. Reeder
Governor Director
March 3, 2014
David Bone, Chairman
Martin County Regional Water and Sewer Authority (MCRWASA)
P.O. Box 668
Williamston, North Carolina 27892-0668
Dear Mr. Bone:
John Skvarla, III
Secretary
Subject: Issuance of NPDES Permit NCO089435
Martin County Water Treatment Plant
1001 Park Street, Williamston
Martin. County
The Division of Water Resources (DWR or the Division) hereby issues the attached NPDES permit for
the subject facility. This permit is issued pursuant to the requirements of North Carolina General
Statute 143-215.1 and the Memorandum of Agreement between North Carolina and the U.S.
Environmental Protection Agency dated October 15, 2007, or as subsequently amended.
During our review of the Engineering Alternatives Analysis (EAA) required of all new discharges,
DWR asked the Wooten Company to provide additional information regarding 1) reuse, 2) holding -
pond and spray -system cost breakdowns, and 3) documentation from the City of Williamston. The
Division is satisfied with the additional information provided, and we concur with Wooten that, based
on costs, discharge to surface Waters of the State [Alternative #3], is the most viable discharge option.
Electronic Discharge Monitoring Reports eDMR). Please be advised that the Division will
implement an electronic Discharge Monitoring Report (eDMR) program, in accord with pending
requirements by the Environmental Protection Agency (EPA). We have included the details required
to implement the eDMR program in this permit [see Special Condition A. (3.)].
Proposed federal regulations require electronic submittal of all DMRs and specify that, if North
Carolina does not establish a system to receive such submittals, Permittees must then submit eDMRs
directly to EPA. For information on eDMRs, registering for eDMR submittal, and obtaining an eDMR
user account, please visit the following webpage:
bttp://lportal.ncdenr.org/web/Wq/admin/bogLipu/ediu.
1617 Mail Service Center, Raleigh, North Carolina 27699-1617
Location: 512 N. Salisbury St Raleigh, North Carolina 27604
Phone: [phone] FAX: [phone] Customer Service:1-877-623-6748
Internet: www.ncwaterquai4.org

Issuance of Permit NCO089435
For the proposed Martin County WTP
For information on EPA's proposed NPDES Electronic Reporting Rule, please visit the following
website: httn://www2.epa.t?ov/compliance/proposed?nodes-electronic-reporting-rule
If any parts, measurement frequencies, or sampling requirements contained in this permit are
unacceptable, you have the right to an adjudicatory hearing, upon written request submitted within
thirty (30) days after receiving this letter. Your request must take the form of a written petition
conforming to Chapter 150B of the North Carolina General Statutes, and you must file it with the
office of Administrative Hearings, 6714 Mail Service Center, Raleigh, North Carolina 27699-6714.
Unless such a demand is made, this permit shall be final and binding.
This permit is not transferable except after notifying the Division of Water Resources. The Division
may require permit modification, or revocation and re -issuance. Please note that this permit does not
affect your legal obligation to obtain other permits required by the Division of Water Resources, the
Division of Land Resources, the Coastal Area Management Act, or other federal or local governments.
If you have questions, or if we can be of further service, please contact Joe R. Corporon, L.G. ROC at
[ioe.corporon ,ncdenr.govl or call [phone].
feeder
Enclosure: NPDES Permit NCO089435 (Issuance Final)
cc: Central Files
Washington Regional Office WaRO/SWPS, David May, Supervisor
NPDES Program Files
ec: WaRO, David May
ATU, Susan Meadows
The Wooten Company, Charlie Davis [thewootencompany.com]

Permit NCO089435
STATE OF NORTH CAROLINA
DEPARTMENT OF ENVIRONMENT AND NATURAL RESOURCES
DIVISION OF WATER RESOURCES
PERLVIIT
TO DISCHARGE WASTEWATER UNDER THE
NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM
(NPDES)
In compliance with the provisions of North Carolina General Statute 143-215.1, other lawful
standards and regulations promulgated and adopted by the North Carolina Environmental
Management Commission, and the Federal Water Pollution Control Act, as amended, the
Martin County Regional Water and Sewer Authority
(MCRWASA)
is hereby authorized to discharge wastewater from a facility located at the
Martin County Water Treatment Plant (WTP)
1001 Park Street, Williamston
Martin County
to receiving waters designated as a unnamed tributary to Sweetwater Creek in the Roanoke River
Basin in accordance with effluent limitations, monitoring requirements, and other conditions set forth
in Parts I, II, III and IV hereof.
This permit shall become effective April 1, 2014.
This permit and authorization to discharge shall expire at midnight on May 31, 2017.
Signed this day March 3, 2014.
G
T - s A. Reeder, Director
Ek'Asion of Water Resources
By Authority of the Environmental Management Commission

Permit NCO089435
SUPPLEMENT TO PERMIT COVER SHEET
(New Facility)
Martin County Regional Water and Sewer Authority
(MCRWASA)
is hereby authorized to:
1. construct and operate a treatment system to produce potable water using conventional treatment
technology generating filter -backwash wastewater and sludge potentially containing the treatment
additives
• alum / aluminum sulfate [Al2(SO4)31
• sodium permanganate (NaMn04)
• powdered activated carbon (PAC)
• sodium hydroxide (NaOH)
• polymer
• chlorine
the facility located at the Martin County Water Treatment Plant (WTP),1001 Park Street,
Williamston, Martin County, and
2. after completing construction, but not later than three (3) working days prior to discharge, notify
the Division's Washington Regional Office [252-946-6481 ] to accommodate oversight startup
activities, as needed, and after receiving Authorization to Operate,
3. begin discharging from said treatment works, at the location specified on the attached map, into
an unnamed tributary of Sweetwater Creek [Stream segment 23-50], a waterbody currently
classified C waters within Subbasin 03-02-09 of the Roanoke River Basin.
Page 2 of 6

Permit NCO089435
PART I
A. (1.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS
During the period beginning on the effective date of this permit and lasting until expiration, the
Permittee is authorized to discharge from Outfall 001. Such discharges shall be limited and
monitored by the Permittee as specified below:
t
QN� VOW �RE`QUIR �MENTS 1
EFiUEaCH`Zt�►C'i'ER SIT
v
-,
r---
-,- 4-7
r �(.4���.�.[°�L[''•ay�.,����"' ). • r s ,
l Y e+..b • � �
Vinthly,_
.a . �
pair
v s., s� --�...
Meas`urremen
Sal
t'ample;
'
Average.axim�iim
`
Fxequeicy
.•.�...�-�
Type.
Loc lion
Flow
50050
Continuous
Recording
Effluent
Total Suspended Solids (TSS)
00530
30.0 mg/L
45.0 mg/L
2/Month
Grab
Effluent
Total Residual Chlorine (TRC)2
50060
17 2
2/Month
Grab
Effluent
Turbidity 3
00076
2/Month
Grab
Effluent
pH
00400
Not < 6.0 nor > 9.0
2/1\4onth
Grab
Effluent
standard units
Total Aluminum
01105
1/Quarter
Grab
Effluent
Total Copper
01042
1/Quarter
Grab
Effluent
Total Manganese
01055
1/Quarter
Grab
Effluent
WET -Testing
TGP3B
j
1/Quarter
Grab
Effluent
Footnotes:
1. No later than January 1, 2015 [270 days from the permit effective date], begin submitting discharge
Monitoring Reports electronically using NCDWR's eDMR application system [See Special Conditions
A. (3.)].
2. Total Residual Chlorine (TRC) - The Division shall consider all effluent TRC values reported below
50µg/L to be compliant with this permit. However, the Permittee shall record and submit all values
reported by North Carolina -certified laboratory methods (including field certified), even if the
reported values fall below 50µg/L.
3. Turbidity - Discharge from this facility shall not cause the receiving -stream turbidity to exceed 50
NTU. If natural background turbidity exceeds 50 NTU, this discharge shall not increase receiving
stream turbidity.
4. Parameter to be sampled concurrently with WET -test sampling.
5. Whole Effluent Toxicity (WET) testing- Chronic Toxicity [Ceriodaphnia] 7-day pass/fail @ 90%
concentration. Sample effluent during the months of March, June, September, and December [see
Section A. (2.)].
Conditions:
• All samples shall be collected from a discharge typical of the effluent.
• The Permittee shall discharge no floating solids or foam.
Page 3 of 6

Permit NCO089435
A. (2.) CHRONIC TOXICITY MONITORING (QUARTERLY)
The Permittee shall conduct quarterly chronic toxicity tests using test procedures outlined in the "North
Carolina Ceriodaphnia Chronic Effluent Bioassay Procedure," Revised February 1998, or subsequent
versions.
The effluent concentration defined as treatment two in the procedure document is 90 %. The testing shall
be performed as a Ceriodaphnia dubia 7day pass/fail test. The tests will be performed during the months of
March, June, September, and December. Effluent sampling for this testing shall be performed at the
NPDES permitted final effluent discharge below all treatment processes.
All toxicity testing results required as part of this permit condition will be entered on the Effluent Discharge
Monitoring Form (MR-1) for the month in which it was performed, using the parameter code TGP3B.
Additionally, DWR Form AT-1(original) is to be sent to the following address:
Attention: NC DENR / DWR / Environmental Sciences Section
1621 Mail Service Center
Raleigh, N.C. 27699-1621
Completed Aquatic Toxicity Test Forms shall be filed with the Environmental Sciences Section no later than
30 days after the end of the reporting period for which the report is made.
Test data shall be complete and accurate and include all supporting chemical/physical measurements
performed in association with the toxicity tests, as well as all dose/response data. Total residual chlorine of
the effluent toxicity sample must be measured and reported if chlorine is employed for disinfection of the
waste stream.
Should there be no discharge of flow from the facility during a month in which toxicity monitoring is
required, the Permittee will complete the information located at the top of the aquatic toxicity (AT) test form
indicating the facility name, permit number, pipe number, county, and the month/year of the report with the
notation of "No Flow" in the comment area of the form. The report shall be submitted to the Environmental
Sciences Section at the address cited above.
Should the Permittee fail to monitor during a month in which toxicity monitoring is required, then monthly
monitoring will begin immediately. Upon submission of a valid test, this monthly test requirement will revert
to quarterly in the months specified above.
Should any test data from this monitoring requirement or tests performed by the North Carolina Division of
Water Resources indicate potential impacts to the receiving stream, this permit may be re -opened and
modified to include alternate monitoring requirements or limits.
If the Permittee monitors any pollutant more frequently than required by this permit, the results of such
monitoring shall be included in the calculation & reporting of the data submitted on the DMR & all AT
Forms submitted.
NOTE: Failure to achieve test conditions as specified in the cited document, such as minimum control
organism survival, minimum control organism reproduction, and appropriate environmental controls, shall
constitute an invalid test and will require immediate follow-up testing to be completed no later than the last
day of the month following the month of the initial monitoring.
Page 4 of 6

Permit NC0089435
A. (3.) ELECTRONIC REPORTING - DISCHARGE MONITORING REPORTS
Proposed federal regulations require electronic submittal of all discharge monitoring reports (DMRs)
and specify that, if a state does not establish a system to receive such submittals, then Permittees
must submit DMRs electronically to the Environmental Protection Agency (EPA). The Division
anticipates that these regulations will be adopted and will begin implementing in 2013.
NOTE: This special condition supplements or supersedes the following sections within Part II of this
permit (Standard Conditions for NPDES Permits):
• Section B. (11.)
• Section D. (2.)
• Section D. (6.)
• Section E. (5.)
Signatory Requirements
Reporting
Records Retention
Monitoring Reports
1. Reporting [Supersedes Part H, Section D. (2.) and Section E. (5.) (a)1
Beginning no later than January 1, 2015 [270 days from the permit effective date],the Permittee
shall report discharge monitoring data electronically using the NC DWR's Electronic Discharge
Monitoring Report (eDMR) internet application.
Monitoring results obtained during the previous month(s) shall be summarized for each month
and submitted electronically using eDMR. The eDMR system allows permitted facilities to enter
monitoring data and submit DMRs electronically using the internet. Until such time that the
state's eDMR application is compliant with EPA's Cross -Media Electronic Reporting Regulation
(CROMERR), Permittees will be required to submit all discharge monitoring data to the state
electronically using eDMR and will be required to complete the eDMR submission by printing,
signing, and submitting one signed original and a copy of the computer printed eDMR to the
following address:
NC DENR / DWR / Information Processing Unit
ATTENTION: Central Files / eDMR
1617 Mail Service Center
Raleigh, North Carolina 27699-1617
If a Permittee is unable to use the eDMR system due to a demonstrated hardship or due to the
facility being physically located in an area where less than 10 percent of the households have
broadband access, then a temporary waiver from the NPDES electronic reporting requirements
may be granted and discharge monitoring data may be submitted on paper DMR forms (MR 1,
1. 1, 2, 3) or alternative forms approved by the Director. Duplicate signed copies shall be
submitted to the mailing address above.
Requests for temporary waivers from the NPDES electronic reporting requirements must be
submitted in writing to the Division for written approval at least sixty (60) days prior to the date
the facility would be required under this permit to begin using eDMR. Temporary waivers shall
be valid for twelve (12) months and shall thereupon expire. At such time, DMRs shall be
Page 5 of 6

Permit NCO089435
submitted electronically to the Division unless the Permittee re -applies for and is granted a new
temporary waiver by the Division.
Information on eDMR and application for a temporary waiver from the NPDES electronic
reporting requirements is found on the following web page:
http://portal.ncdenr.or web/wq/admin/bog/ipu/edmr
Regardless of the submission method, the first DMR is due on the last day of the month
following the issuance of the permit or in the case of a new facility, on the last day of the month
following the commencement of discharge.
2. Signatory Requirements [Supplements Part II, Section B. (11.) (b) and supersedes Section B. (11.)
All eDMRs submitted to the permit issuing authority shall be signed by a person described in Part
II, Section B. (11.)(a) or by a duly authorized representative of that person as described in Part H,
Section B. (I 1.)(b). A person, and not a position, must be delegated signatory authority for
eDMR reporting purposes.
For eDMR submissions, the person signing and submitting the DMR must obtain an eDMR user
account and login credentials to access the eDMR system. For more information on North
Carolina's eDMR system, registering for eDMR and obtaining an eDMR user account, please
visit the following web page:
http://portal.ncdenr.or web/wq/admin/bog/iyu/edmr
Certification. Any person submitting an electronic DMR using the state's eDMR system shall make
the following certification [40 CFR 122.22]. NO OTHER STATEMENTS OF CERTIFICATION
WILL BE ACCEPTED:
7 certify, under penalty of law, that this document and all attachments were prepared under my
direction or supervision in accordance with a system designed to assure that qualified personnel
properly gather and evaluate the information submitted. Based on my inquiry of the person or
persons who manage the system, or those persons directly responsible for gathering the
information, the information submitted is, to the best of my knowledge and belief, true, accurate,
and complete. I am aware that there are significant penalties for submitting false information,
including the possibility of fines and imprisonment for knowing violations. "
3. Records Retention [Supplements Part II, Section D. (6.)1
The Permittee shall retain records of all Discharge Monitoring Reports, including eDMR submissions.
These records or copies shall be maintained for a period of at least 3 years from the date of the report.
This period may be extended by request of the Director at any time [40 CFR 122.41].
Page 6 of 6

Roanoke River
(flows E) /
! .Fr 'S C�1� x-A+•,. 3 •:-� , C� ��� 6�.�a{�9iyn
l 9 N
e
IS
• '� t F . ice. / � �� —1ti � �-�-- ���'
F �
.:)" NC Hwy 17 � � � �\ •- '�� '� —� �' = -
UT to Sweetwater Creek
_
'.v � P • Ty v -
e.
-
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Proposed
- BM Sweetwater Creek
- e � -� � �`
y
y 4 (flows NE)
Outfa11001 t -
(flows NE)}
Approximate Property
BoundaryCh
' L
/-'"`-o�'.. / �• µ•Rally. inaa
MCRWASA
Martin County WTP
State Grid/USGS Ouad: D30SE / Williamston, NC
Drainage Basin: Roanoke River Basin Sub -Basin: 03-02-09
Receivine Stream: UT to Sweetwater Creek HUC: 03010107
Stream Segment: 23-50 Strcam Class: C
Latitude: 35050'53"N Longitude: 77002'39"W
Facility
Locati
not to s
NPDES Permit NCO089435
Martin County

AFFIDAVIT OF PUBLICATION
STATE OF NORTH CAROLINA
COUNTY OF WAKE
Advertiser Name: DEPARTMENT OF WATER RESOURCES
Address: 1617 MAIL SERVICE CENTER PROTECTION SECTION/ I
RALEIGH, NC 276991617
Before the undersigned, a Notary Public of Wake
County North Carolina, duly commissioned and
authorized to administer oaths, affirmations, etc.,
personally appeared DEBORAH MAHAFFEY, who
being duly sworn or affirmed, according to law, doth
depose and say that he or she is Accounts
Receivable Specialist of The News & Observer a
corporation organized and doing business under
the Laws of the State of North Carolina, and
publishing a newspaper known as The News &
Observer, in the City of Raleigh, Wake County and
State aforesaid, the said newspaper in which such
notice, paper, document, or legal advertisement
was published was, at the time of each and every
such publication, a newspaper meeting all of the
requirements and qualifications of Section 1-597 of
the General Statutes of North Carolina and was a `...
qualified newspaper within the meaning of Section p!
1-597 of the General Statutes of North Carolina
Ad Number
WKg1:•:•
Public Notice
Narth Car.11. ErMranncrd.l
M.ri.perneM Ca wrAnloWNPDES Unit
1617Mall Service Center
Raleigh, NC 2/69 1617
Noticeat Iatendt, Issue.
NPDES Wastemaler Permlt
N60: February 9, 2014
and that as such he or she makes this affidavit; and "1pTHY ii,
is familiar with the books, files and business of said ;° �`0 4'tis
corporation and by referenceto the files of said = % `o
public.atibn•the attached. advertisement for 41, fjP"brC :=
DEPARTMENT OF WATER RESOURCES was =a o
inserted in the aforesaid newspaper on dates as 01r
follows: °°CAi l0 �P `•
02/09/2014
DEBORAH MAHAFFEY, Accounts Recce a pecialist
Wake County, North Carolina
Sworn to and subscribed before me
This 10th day of February, 2014
My Commission Expires:
• • -

FACTSHEET
COMPLEX EXPEDITED - NEW PERMIT
NPDES NCO089435;
Basic Permitting Information and Issuance Rationale 1/�_
Permit Writer/Date
Joe R. Corporon L. . / 19Se 2013 revised 230ct2013
Permit Number — County - Region
NCO089435 —Marlin County - WaRO
Facility Name
Martin County TP - Conventional Treatment Technology
Potable Flow / Waste Flow
20 MGD / 0.3A MGD
Basin Name/Sub-basin number
Roanoke Riv r Basin / 03-02-09
Receiving Stream
UT to Sweetwater Creek [segment 23-50]
Stream Classification
C [discharge proposed under assumed zero-flow,7Q 10 = 0.0 cfs
Does permit need Daily Max NH3 limits?
No
Does permit need TRC limits/language?
Yes
Does permit need toxicity testing?
Yes - Chronic TGP3B Cerioda hnia; 7-day Pass/Fail Quarter)
Does permit need Special Conditions?
No
Does permit need instream monitoring?
No
Is the stream impaired (on 303(d) list)?
No
Any obvious compliance concerns?
— Not applicable
Any permit mods since lastpermit?
No - New Permit
Request for discharge received
June 18, 2013
Current expiration date
— Not applicable
New expiration date
May 31, 2017
Comments:
Design: The Wooten Company, Engineers,
Shankar Mistry, Ph.D., P.E. 919-828-0531
Receiving -stream 7Q10 not provided; assumed — zero -flow, high
groundwater table /swampy conditions.
• Proposed Treatment System — Conventional treatment technology; will generate 2.0 MGD of potable water
from two sources, groundwater & surface water (Roanoke River).
• Proposed Wastewater: decant @ 0.320 MGD; variable flow, 7/week;
• Assume zero -flow receiving stream [7Q10 = 0.0 cfs];
• Proposed Chemical Additives: Alum / aluminum sulfate; sodium permanganate (NaMn04); Powdered
Activated Carbon (PAC); Sodium Hydroxide (caustic); Polymer; chlorine.
• Facility will NOT use: iron or ferrous sulfate; Zn-orthophosphate; ammonia nitrogen [NH3 as N];
Chloramines.
Discharge Engineering Alternatives Analysis (EAAI: the Applicant's EAA lists three (3) discharge alternatives.
Upon review (20Sep2013) the NPDES Unit concluded that the Applicant needed to address questions about 1)
reuse, 2) holding -pond and spray -system costs, and 3) confirm that the City of Williamston will accept their
discharge. Having answered these questions and revised costs for Alternative #2 to the Division's satisfaction
(070ct2013), DWR concurs that the list of alternatives is both viable and comprehensive. Based on cost, the
Consultant concludes that Alternative 93 is the most viable discharge alternative.
Discharge AlternativesSummary:
Alternative
Net Present -Worth Cost
#1 - discharge decant to Williamston sanitary sewer $6,414,999
92 - discharge decant to land application $6,100,865
#3 - discharge decant to surface waters $911 920

Roanoke River Basin
Name Index Number Classification Class Date
Description
Special Designation
South Hyco Creek (Lake Roxboro)
22-58-4-(1.4)
WS-II,B;HQW
08/03/92
.From backwaters of Lake Roxboro to dam at Lake Roxboro
South Mayo River
22-30-2
C
08/01/98
From North Carolina -Virginia State Line to Mayo River
Spellers Creek
23-51.5
C
09/01/57
From Devils Gut to Roanoke River
Spewmarrow Creek
23-2-9-(2)
B
01/01/62
From Deer Pond Branch to Grassy Creek Arm of John H. Kerr Reservoir
Spewmarrow Creek
23-2-9-(1)
C
07/01/73
From source to Deer Pond Branch
Spoonwater Creek
22-58-15-3
C
09/01/74
From source to Mayo Reservoir, Mayo Creek
Storys Creek 22-58-12-(5) C 07/01/73
From dam at Chub Lake to Hyco River
Storys Creek 22-58-12-(1) WS-II;HQW 08/03/92
From source to a point 0.9 mile downstream of N.C. Hwy. 57
Storys Creek (Chub Lake) 22-58-12-(4) B 09/01/57
From Roxboro City Lake Dam to dam at Chub Lake
Storys Creek [Roxboro City Lake (Lake Issac Walton)] 22-58-12-(1.5) WS-II;HQW,CA 08/03/92
From a point 0.9 mile downstream of N.C. Hwy. 57 to Roxboro City Lake Dam
Straight Fork Creek 22-25-1-1
From source to Brushy Fork Creek
Sugartree Creek 22-58-4-1
From source to South Hyco Creek
Sutton Creek
From source to Wading Place Creek
Swamp Creek
.From source to Cashie River
Sweetwater Creek
From source to Roanoke River
Tackett Branch
From source to Smith River
24-2-8-1
24-2-10
23-50
22-40-4
C
09/01/74
WS-II;HQW
08/03/92
C;Sw
09/01/57
C;Sw 09/01/57
C 09/01/57
C 09/01/57
Thursday, February 09, 2012 Based on Classifications as of 20120208 Page 26 of 29

]V
THE October 2, 2013
WOOTEN
COMPANY Mr. Joe Corporon, L.G. ROC
E N G I N E E R I N G Expedited Permitting Compliance and Enforcement Unit
NPDES Program/Surface Water Protection Section
P L A N N I N G Division of Water Resources, NCDENR
1611 Mail Service Center
ARCHITECTURE
i Raleigh, NC 27699-1611
Re: MCRWASA Proposed Water Treatment Plant (WTP)
NPDES Permit NCO089435
Dear Mr. Corporon:
Reference is made to your September 20, 2013 e-mail concerning the review
comments on the subject project. The comments included in the e-mail are
addressed as follows:
1. As required by the EEA Guidance Document the Alternative considering
the Wastewater Reuse is included in Section 3.4 of the attached revised
"Engineering Alternative Analysis for Discharge of Wastewater from
MCRWASA 2.0 MGD Conventional Water Treatment Plant, October
2013."
2. Under Alternative No. 2, the construction cost of the 4.48 MG decanted
wastewater storage basin was based upon using the unit cost of
approximately $0.614/gallon for two (2) 2.24 MG, each, pre -stressed
concrete storage tanks with dome covers. It is recognized that the
description included in the EAA call for 4.48 MG storage basin that can be
interpreted as earthen storage basin and the cost of such facility will be less
when compared with the cost of two (2) 2.24 MG, each, pre -stressed
storage tanks with dome covers. Please note that the earthen storage basin
was not used in estimating the cost due to the following reasons: (1)
degradation of water quality due to algae growth and attraction of geese
that may attribute to non-compliance with the Type 1 reclaimed water
reuse standards included in 15A NCAC 02U .0301 (b) rule when the
reclaimed water reuse opportunities maybe available in near future, and (2)
considering the 54.25 inches annual rainfall and 36.25 inches annual
120 Noah Boylan Avenue evapotranspiration in the area, there will be a net gain of 18-inches annual
Raleigh NC 27603-1423 rainfall in the catchment's area of the storage basin without cover which
will add approximately 1,046,000 gallon of water per year in the basin and
will require increase in storage basin size as well as the land area
919.828.0531 requirement for spray irrigation system that will subsequently add more
fax [phone]

v
cost to this alternative. In order to use a reasonable cost of the 4.48 MG
storage facilities in evaluation of this alternative, we have recently received
quotation from pre -stressed concrete tank suppliers for two (2) 2.24 MG
pre -stressed concrete tanks with covers. Based upon the quotes, the
construction cost of providing two (2) 2.24 MG, each, pre -stressed concrete
tanks with covers is estimated as follows:
Construction Cost Estimate for Pre -stressed Concrete Tanks:
Two (2) 115'-0" x 32'-2", each, pre -stressed concrete = $
tanks with dome, $ 950,000.00/tank x 2 = $ 1,900,000.00
Contractor's mark-up, overhead and profit
Stone, 834 CY x $ 40.00/CY
Site work and erosion control
Ultrasonic level indicator and transmission
Total Construction Cost
1,900,000.00
380,000.00
33,360.00
7,500.00
5,000.00
29325,860.00
The above cost is included in the revised Section 3.2.8 Construction Cost
Opinion.
3. The spray irrigation piping and solid set sprinkler system cost was
estimated using the year 2009 BID price of the Kinston Reclaimed Water
System Improvements Project's spray irrigation piping and solid set
sprinkler system for the 38.45 acre spray irrigation system. The
construction cost for the MCRWASA spray irrigation piping and solid set
sprinkler system for 68 acre spray irrigation system is estimated as follows:
Construction Cost Estimate for Spray Irrigation Piping and Solid Set
Sprinkler System (excluding spray irrigation pump station):
a. Basic Considerations:
Kinston's spray irrigation piping and solid set sprinkler = $ 5591,878.00
system 2009 BID cost (excluding spray irrigation pump station)
Kinston's spray irrigation system wet acreage 38.45 acres
Kinston's spray irrigation piping and solid set sprinkler $ 14,561.19
system cost/acre, $559,878.00/38.45 acres = $ 14,561.19
MCRWASA's spray irrigation system wet acreage 68.00 acres
Inflation rate 4.0 percent
b. Adjusted Year 2013 Cost for MCRWASA Spray Irrigation Piping
and Solid Set Sprinkler System (excluding spray irrigation pump
station)
_ ($ 14,561.19/acre) x 68 acre x (1+0.04)4
_ $ 1,158,348.00
Use = $ 1,158,000.00

The above cost is included in the revised Section 3.2.8 Construction Cost
Opinion
4. A letter from the Town of Williamston confirming that the Town has
treatment capacity and will accept the domestic wastes as well as the
supernatant from sludge thickening and filter backwash storage tanks is
attached herewith.
On behalf of the Martin County Regional Water and Sewer Authority
(MCRWASA), we sincerely appreciate your assistance in this matter. Should
you have any questions or need more information concerning our response to
your comments, please call me or Dustin Rhodes at 919-828-0531.
Sincerely,
—61..-LL. R . M,'a4 ,y
Shankar R. Mistry, Ph. D., P.E.
Cc: David Bone, Chairman, MCRWASA
Dan Boone, The Wooten Company
Charles Davis, The Wooten Company
Dustin Rhodes, The Wooten Company

Town of Williamston
Public Works
Kerry L. Spivey, Director
PO Box 506, 602 Tack Street
Wiliiamston, NC 27892
Phone [phone]
FAX [phone]R75
October 15, 2012
Art: David Bone
Martin County Regional Water and Sewer Authority
PO Box 668
Williamston, NC 27892
Dear Mr. Bone:
�Vii1>Q
IH CaA?.
This letter serves to advise of the Town of Williamston's current intent to provide sewer services
to the Martin County Regional Water and Sewer Authority's water treatment facility proposed to
be constructed adjacent to the town's outfall line off of the south-eastem end of Park Street in
Williamston.
It is our intent to accept flow up to a maximum of 0.3 MGD in the form of domestic wastes as
well as supernatant from the facility's sludge thickening process. As it is my understanding that
the Authority intends to begin the process of application for their NPDES permit right away, this
flow quantity is intended as a temporary permitted capacity to allow for the start-up and full
operation of MCRWASA's treatment facility as the Authority applies for the NPDES permit and
may be modified by the town at any time as needed.
The town also intends, as an emergency measure, to allow sludge to be contributed directly to the
town's sludge holding facilities from the water treatment facility's sludge disposal process on a
case by case basis and in accordance with any terms and fees that may be set or adopted by the
town Board of Commissioners.
Please feel free to call with any questions or if further information is needed regarding this
matter.
*Sincere,
Public Works Director
Town of Williamston
GOT 201.7
RECEIVED
-UR

GF W A T�c� State of North Carolina
0� OG Department of Environment and Natural Resources
-�, . - - - - - - - - - - - - - - - - - - - - - - Division of Water Quality
A < Flow Tracking/Acceptance for Sewer Extension Permit Applications
(FTSE—10/07)
Project Applicant Name: Martin County Regional Water and Sewer Authority (MCRWASA)
Project Name for which flow is being requested: Water Treatment Plant and Water
Transmission System
More than one FTSE 10107 may be required for a single project if the owner of the WWTP is not responsible for all
pump stations along the route of the proposed wastewater flow
I. Complete this section only if you are the owner of the wastewater treatment plant.
a. WWTP Facility Name: Williamston WWTP
b. WWTP Facility Permit #: NCO020044
All flows are in MGD
c. WWTP facility's permitted flow 2.
d. Estimated obligated flow not yet tributary to the WWTP 0.225 mad
e. MTITP facility's actual avg. flow 0.864 mgd
f. Total flow for this specific request 0.300 mad
& Total actual and obligated flows to the facility 1.389 ma_ d
h: Percent of permitted flow used 69.45 %
II. Complete this section for each pump station you are responsible for along the route of this
proposed wastewater flow.
List pump stations located between the project connection point and the WWTP
Pump Station Name Approx. Capacity, MGD Approx. Current Avg.
(Firm/Design) Daily Flow, MGD
N/A
III
Certifigation S to nt:
certify that, to the best of my knowledge, the addition of the
volume of4astewafi& to be 6ermitted in this project has been evaluated along the route to the receiving
wastewater treatment facility and that the flow from this project is not anticipated to cause any capacity
related sanitary sewer overflows or overburden any downstream pump station en route to the receiving
treatment plant under normal circumstances. This analysis bas been performed in accordance with local
established policies and procedures using the best available data. This certification applies to those items
listed above in Sections Iand H for which I am the responsible party. Signature of this form indicates
acceptance 0 ter flow.
Date

ENGINEERING ALTERNATIVE ANALYSIS
for
DISCHARGE OF WASTEWATER
from
MCRWASA 2.0 MGD CONVENTIONAL WATER TREATMENT
PLANT
Martin County Regional Water and Sewer Authority
Town of Williamston, North Carolina
MAY 2013
(Revised October 2013)
6-u4" M. Fhec/u. 1014A013
Dustin M. Rhodes, E.I.
-%-"Kry R . M,164rj to 14.1se13
Shankar R. Mistry, Ph.D., P.E.
Tq
THE WOOTEN COMPANY
ENGINEERING PLANNING I ARCHITECTURE
120 North Boylan Avenue Raleigh NC 27603-1423
919.828.0531 fax [phone]
Twc 3104-G

ON
}
TABLE OF CONTENTS
1.0 INTRODUCTION
2.0 ESTIMATED WATER TREATMENT PLANT' S WASTEWATER FLOW ..................
3
2.1
Estimated Pulsator Clarifiers' Waste Sludge Decant from Sludge Storage Tank.....
3
2.2
Estimated Wastewater from Filter Backwash and Filter to Waste Operations .........
3
2.3
Estimated Wastewater from Continuously Operated Sample Pumps .................
2.4
Total Decanted Wastewater Discharge from Water Treatment Plant .......................
4
3.0 ENGINEERING ALTERNATIVE ANALYSIS FOR WASTEWATER DISPOSAL ......
6
3.1
Alternative No. 1........................................................................................................
6
3.1.1 Description.....................................................................................................
6
3.1.2 Construction Cost Opinion............................................................................
6
3.1.3 Annual Operation and Maintenance Costs ....................................................
7
3.1.4 Economic Analysis........................................................................................
7
3.2
Alternative No. 2......................................................................................................10
3.2.1 Land Application Site with Suitable Soils...................................................10
3.2.2 Hydraulic Loading Rate...............................................................................12
3.2.3 Land Requirement........................................................................................14
3.2.4 Storage Requirement....................................................................................14
3.2.5 Cover Crop Selection for Land Application Site.........................................15
3.2.6 Spray Irrigation System...............................................................................17
3.2.7 Description...................................................................................................17
3.2.8 Construction Cost Opinion..........................................................................18
3.2.9 Annual Operation and Maintenance Costs..................................................19
3.2.10 Economic Analysis......................................................................................19
3.3
Alternative No. 3......................................................................................................
24
3.3.1 Description...................................................................................................
24
3.3.2 Construction Cost Opinion..........................................................................
24
3.3.3 Annual Operation and Maintenance Costs ..................................................
25
�.,
3.3.4 Economic Analysis......................................................................................
25
3.4
Alternative No. 4......................................................................................................
28
�•, 3.5
Selection of Alternatives..........................................................................................
28
a"

TABLE OF CONTENTS
(Continued)
TABLES
Table 1— Physical Properties and Water Features of Soils...............................................12
Table 2 — Water Balance to Derive Hydraulic Loading Rate............................................16
Table 3 — Calculation of Storage Capacity Requirement per Acre of Field Area .............16
Table 4 — Summary of the Present Worth Cost Analysis for Alternatives ........................28
EXHIBITS
Exhibit 1
Schematic Flow Diagram of Proposed Water Treatment Plant .........................2
Exhibit 2
Alternative No. 1: USGS Map Showing Location of Decant Water Discharge
to Town of Williamston Sewer System.............................................................
Exhibit 3
Alternative No. 1: Schematic Flow Diagram of Decant Water Discharge to
Town of Williamston Sewer System.................................................................9
Exhibit 4
Alternative No. 2 Schematic Flow Diagram for Disposal of Decant Water by
LandApplication.............................................................................................21
Exhibit 5
Alternative No. 2 USGS Map Showing Location of Land Application Site ... 22
Exhibit 6
Alternative No. 2 Soil Map for Land Application Site....................................23
Exhibit 7
Alternative No. 3 Schematic Flow Diagram for Disposal of Decant to
Unnamed Tributary to Sweetwater Creek........................................................26
Exhibit 8
Alternative No. 3 USGS Map Showing Location of Decant Discharge to
Unnamed Tributary to Sweetwater Creek........................................................27
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1.0 INTRODUCTION
The Martin County Water and Sewer Authority (MCWASA) 2.0 MGD Water Treatment
Plant (Exhibit 1) is designed to includes: raw water intake in Roanoke River, raw water pump
station, 11.0 million gallon capacity raw water storage reservoir, intermediate raw water pump
station, super pulsator clarifiers, dual media filtration system, chlorine disinfection system,
300,000 gallon capacity finished water ground storage tank, high service pump station, post
chlorine and caustic feed to maintain proper chlorine residual and pH of the water entering
distribution system, 529,300 gallon filter backwash waste/filter to waste/sampling waste storage
tank, 529,300 gallon sludge storage tank, sludge loading pump station and decant recycle/waste
pump station.
The wastes generated at the water treatment plant will include: (1) waste sludge from
super pulsator clarifiers, (2) wastewater from the filter backwash, filter to waste and sampling
operations, and (3) waste from sanitary facilities. The waste sludge generated from the super
pulsator clarifiers will be discharged to a 529,300 gallon capacity sludge storage tank for gravity
thickening and decanting operations. The wastewater generated from filter backwash, filter to
waste and sampling operations will be discharged to the 529,300 gallon capacity filter backwash
storage tank for equalization, solids settling and decanting operations. The wastewater
generated from sanitary facilities at the water treatment plant will be discharged to the Town of
Williamston sewer system. The gravity thickened sludge from both the sludge storage and filter
backwash storage tanks will be periodically disposed of by land application at permitted sites,
using a private contractor engaged in disposal of residuals by land application. The decants
from the sludge holding tank and the filter backwash storage tank will be dechlorinated and
discharged to the unnamed tributary to Sweetwater Creek (Exhibits 7 and 8) in the Roanoke
River Basin by obtaining an NPDES permit in accordance with the NCDWQ Water Treatment
Plant Permitting Guidance.
Engineering Alternative Analysis 1 October 2013
for Discharge of Wastewater 3104-G
MCRWASA

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EXHIBIT 1
Martin County Regional Water And Sewer Authority
Proposed Water Treatment Plant Schematic Flow Diagram
v
TNEWOOTENCOMPANY
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2.0 ESTIMATED WATER TREATMENT PLANT'S WASTEWATER FLOW
2.1 Estimated Pulsator Clarifiers' Waste Sludge Decant from Sludge Storage Tank
1. Basic Design Considerations
Design Capacity of the Water Treatment Plant, mgd = 2.0
Estimated Waste Sludge Quantity from Pulsator Clarifiers, lbs/day
(dry weight basis) =1,100
Percent Solids in Waste Sludge from Pulsator Clarifiers = 0.5
Percent Solids in Gravity Thickened Waste Sludge in Sludge Storage Tank = 2.0
Specific Gravity of Waste Sludge from Pulsator Clarifiers = 1.0
Specific Gravity of Gravity Thickened Waste Sludge in Sludge Storage Tank = 1.02
2. Estimated Pulsator Clarifiers' Waste Sludge Decant from Sludge Storage Tank
1,100 lb TSS / da= ( y _ 1,100 lb TSS / day
8.34 lb/gal x 1.0 x 0.005 8.34 lb/gal x 1.02 x 0.02
= 26,379 — 6,465
= 19,914 gallons/day
20,000 gallons/day
2.2 Estimated Wastewater from Filter Backwash and Filter to Waste Operations
1. Basic Design Considerations
Design Capacity of the Water Treatment Plant, mgd =
2.0
Number of Filters, 13.5" x 13.5", each =
3
Filter Surface Area, sq. ft., each =
182.25
Total Filter Surface Area, sq. ft. =
546.75
Design Filtration Rate, gpm/sq. ft. with one (1) filter out of service =
4.0
Design Max. Backwash Rate, gpm/sq. ft. =
20
Design Filter Run Time, hr, per AWWA Manual =
24
Number of Filters Backwashed per day =
2
Filter Backwash Duration, minute, max, each filter =
20
Filter to Waste Duration, minute =
20
Engineering Alternative Analysis
for Discharge of Wastewater
MCRWASA
3
October 2013
3104-G

P"
7
MR
00
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2. Estimated Wastewater from Filter Backwash and Filter to Waste Operations
a. Wastewater from Filter Backwash Operation
182.25 sq. ft. x 2 filters. x 20 gpm x 20 minute
filter 1 sq. ft. 1
= 145,800 gals/day
b. Wastewater from Filter to Waste Operation
182.25 sq. ft. x 2 filters. x 4 gpm x 20 minutes
filter 1 sq. ft.
= 29,160 gals/day
c. Total Wastewater from Filter Backwash and Filter to Waste Operations
= 145,800 + 29,160
= 174,960 gals/day
2.3 Estimated Wastewater from Continuously Operated Sample Pumps
1. Basic Design Considerations
Raw Water Sample Pump Capacity, gpm =
Flocculated Water Sample Pump Capacity, gpm =
Settled Water Sample Pump Capacity, gpm =
Filtered Water Sample Pump Capacity =
Post Chlorine Sample Pump Capacity =
Treated Water Sample Pump Capacity =
Sampling Duration, hrs/day, each pump =
2. Estimated Wastewater from Sample Pumps Operation
_ [(1 x 5 gpm) + (4 x 4 gpm) x (1 x 1 gpm)] x 1,440 min utes
day
5
4
4
4
1
4
24
= 31,680 gals/day
2.4 Total Decanted Wastewater Discharge from Water Treatment Plant
1. Basic Considerations
Decant from Sludge Storage Tank, gallon/day = 20,000
Decant from Storage Tank for Filter Backwash Waste, Filter to Waste
and Sample Pump Waste (174,960 + 31,680 = 206,640 gallon/day) = 206,640
Total Decanted Wastewater Discharge = 226,640
Decanted Wastewater Discharge Schedule, days/week = 5
Engineering Alternative Analysis 4 October 2013
for Discharge of Wastewater 3104-G
MCRWASA

2. Estimated Decanted Wastewater Discharge
,., 226,640 gals / day x Mays / week
5 days/week
= 317,296 gallons/day
Use = 320,000 gallons/day
OR
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Engineering Alternative Analysis 5 October 2013
for Discharge of Wastewater 3104-G
MCRWASA

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3.0 ENGINEERING ALTERNATIVE ANALYSIS FOR WASTEWATER DISPOSAL
As required by the NPDES Permit Unit of NC Division of Water Quality, the following
alternatives are evaluated to provide the most cost-effective solution for disposal of the decanted
wastewater from the residual waste storage tank, and the filter backwash/filter to waste/sampling
waste storage tank at the 2.0 MGD MCRWASA conventional water treatment plant.
3.1 Alternative No.1
This alternative (Exhibits 2 and 3) considers disposal of decanted wastewater from the
super pulsator clarifiers' waste sludge storage tank and the filter backwash waste/filter to
waste/sampling waste storage tank to the Town of Williamston sewer system. The detailed
description and cost analysis of this alternative are provided as follows:
3.1.1 Description
The principal components for this alternative are described as follows:
1. Provide decant facilities and associated piping with modulating valves for
control of withdrawal of decants from the super pulsator clarifiers' waste
sludge storage tank and filter backwash waste/filter to waste/sampling waste
storage tank and discharge of decants to the pump station.
2. Provide a duplex 500 gpm capacity decant pump station, 215 LF of 8-inch
forcemain, distribution box, 460 LF of 12-inch gravity sewer, piping,
distribution box and flow metering and sampling manhole for discharge of
decants to the Town of Williamston's 15-inch sanitary sewer.
3.1.2 Construction Cost Opinion
Floating Decanters / Precast Valve Boxes / Flow Control Valves
$ 166,000.00
Decant Pump Station
110,000.00
Distribution Box
13,500.00
Sitework and Piping, including Erosion -Control
35,000.00
Flow Metering and Sampling
15,000.00
Electrical and Controls
27,000.00
Mobilization / Bond / Insurance (4.0%)
14,500.00
Total Construction Cost
$ 381,000.00
Contingencies (10%)
38,100.00
Engineering Design
37,900.00
Construction Administration and Observation
48,000.00
Operation and Maintenance Manual
2,000.00
Start -Up Services
1,500.00
am Engineering Alternative Analysis 6 October 2013
for Discharge of Wastewater 3104-G
MCRWASA

Interest during Construction 4,300.00
Total Project Cost $ 5129800.00
3.1.3 Annual Operation and Maintenance Costs
Salaries, including fringe benefits $ 17,125.00
Electrical 2,100.00
Sewer User Charge by Town of Williamston 394,200.00
Maintenance / Capital Outlay / Miscellaneous 1,575.00
Total Annual Operation and Maintenance Costs $ 4159000.00
3.1.4 Economic Analysis
A.
Basic Considerations
1.
Planning Period, years =
20
2.
Capital Cost of the Project =
$ 512,800.00
3.
Annual Operation and Maintenance Costs =
$ 415,000.00
4.
Interest Rate, percent =
3.375
5.
Single Payment Present Worth Factor at 3.375%
Interest Rate for 20 Years =
0.51486
6.
Uniform Series Present Worth Factor at 3.375%
Interest Rate for 20 Years =
14.37373
7.
Estimated Salvage Value — Decants Facilities for Discharge
To Sewer System = $(381,000 - 14,500) x (1 - 20) _ $122,167.00
30
B.
Present Worth Analysis
�+ 1.
Initial Project Cost =
$ 512,800.00
2.
Present Worth of Annual O&M Costs
$415,000.00 x 14.37373 =
$ 5,965,098.00
3.
Present Worth of Salvage Value
$122,167.00 x 0.51486 =
$ 62,899.00
Net Present Worth Cost (1 + 2 — 3) _
$ 614149999.00
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Engineering Alternative Analysis 7 October 2013
for Discharge of Wastewater 3104-G
MCRWASA

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EXHIBIT 3
Alternate No 1
Martin County Regional Water And Sewer Authority
Decant Water Disposal to Town of Williamston Sewer
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3.2 Alternative No. 2
This alternative (Exhibits 4, 5 and 6) considers disposal of decanted wastewater from the
super pulsator clarifiers' waste sludge storage tank and the filter backwash waste/filter to
waste/sampling waste storage tank by land application. The pertinent information on evaluation
of this land application alternative, description, and cost analysis of this alternative are provided
in the following sections:
3.2.1 Land Application Site with Suitable Soils
Disposal of the decanted wastewater by land application requires adequate land with
suitable soils that allow for infiltration of the applied wastewater to meet the irrigation needs of
0M the cover crops and recharge of groundwater. In the immediate vicinity of the proposed 2.0
MGD conventional water treatment plant, approximately 145.5 acres of cleared land with
suitable soils (Exhibit 6) is available for disposal of decanted wastewater by land application
using spray irrigation system. This site includes soil types such as Bonneau loamy sand (BoB
�•► and BoC), Goldsboro fine sandy loam (GoA), Norfolk loamy fine sand (NoA and NoB) and
Wickham sandy loam (WkB). These soils are suitable because they are moderately well to well
drained and contain high water table depths in the range of 2.0 to > 6.0 feet below the ground
levels. A brief description of these soil types are given in the Soil Survey of Martin County,
North Carolina, provided as follows:
Bonneau loamy sand, 0 to 6 percent slopes (BoB): This soil is gently sloping and well
drained, making it suitable for disposal of treated wastewater by land application. The soil
usually contains a grayish brown loamy sand surface layer approximately 10-inches thick,
followed by a light yellowish brown loamy sand subsurface layer to a depth of 26-inches. The
subsoil extends to a depth of nearly 75-inches and consists of mostly brownish yellow and light
'�► yellowish brown sandy loam and sandy clay loam. Permeability is higher in the surface and
subsurface layers of these soils and the water capacity is typically low to moderate. The seasonal
high water table is typically 3.5 to 5.0 feet deep in the soil during the wet season.
Bonneau loamy sand, 6 to 12 percent slopes (BoQ: This soil is similar to the BoB soil
classification with the exception of higher slopes. This soil typically has a dark gray loamy sand
and surface layer about 5-inches thick, followed by a pale brown loamy sand subsurface layer
that reaches to a depth of 28-inches. The subsoil extends to a depth of 62-inches and generally
contains yellowish brown and brownish yellow sandy clay loam and gray sandy loam.
Engineering Alternative Analysis 10 October 2013
for Discharge of Wastewater 3104-G
MCRWASA

OR
P"
Permeability is higher and water capacity is generally low to moderate. The seasonal high water
table is also 3.5 to 5.0 feet deep in the soil during the wet season.
Goldsboro fine sandy loam, 0 to 2 percent slopes (NoA): This soil is relatively flat
and moderately well drained. It is typically found on smooth uplands. The soil usually has a 9-
injch thick fine sandy loam surface layer with a dark grayish brown color. Below is a light
yellowish brown fine sandy loam subsurface layer that reaches to a depth of nearly 14-inches.
The subsoil extends to a depth of 67-inches and consists of yellowish brown sandy clay loam and
ow gray sandy clay loam. Permeability is moderately slow and available water capacity is moderate.
The seasonal high water table is typically 2.0 to 3.0 feet in the soil during the wet season.
Norfolk loamy fine sand, 0 to 2 percent slopes (NoA): This soil is relatively flat and
well drained. It is typically found on smooth slopes and broad uplands. The surface layer
generally consists of a light yellowish brown loamy fine sand 6-inches thick. Below the surface
layer, the subsoil extends to a depth of 62-inches and consists of yellowish brown sandy loam
and clay loam. Permeability and available water capacity are both moderate and the seasonal
high water table is 4 to 6 feet deep during the wet season.
Norfolk loamy fine sand, 2 to 6 percent slopes (NoB): This soil is gently sloping and
also well drained. It is typically found on upland areas. The surface layer consists of a light
yellowish brown loamy fine sand 6-inches thick followed by the subsoil layer that extends to a
depth of 62-inches. The subsoil layer generally contains yellowish brown sandy loam and clay
'M loam. Permeability and available water capacity are also moderate and the seasonal high water
table is 4 to 6 feet during the wet months. This
soil is very similar to NoA soil classification.
Wickham sandy loam, 0 to 6 percent slopes (WKB): This soil is gently sloping, well
drained and is generally found in terraces. Both surface and subsurface layers consists of
"" yellowish brown sandy loam with the surface layer typically being 8-inches thick and the
subsurface layer extending to a depth of 12-inches. The subsoil consists of yellowish red and
M' brown sandy clay loam as well as reddish yellow sandy loam and extends to a depth of 50-
inches. Permeability and available water capacity are both moderate. The seasonal high water
table is greater than 6 feet deep during the wet months.
In addition to the above information provided on the soils type encountered at the
proposed land application site, the information on soil types and associated soil depths,
permeability and seasonal high water tables is given in Table 1 for further evaluation of the land
application alternative.
Engineering Alternative Analysis 11 October 2013
for Discharge of Wastewater 3104-G
MCRWASA

0"
MR
0"
TABLE 1
PHYSICAL PROPERTIES AND WATER FEATURES OF SOILS
Soil Name (Map Symbol)
Depth
Permeability
High Water Table
Area('`)
inch
inch/hr
ft.
acres
Bonneau Loamy Sand,
0 — 26
6.0 — 20
3.5 — 5.0
71.2
(BoB, BoQ
26 — 75
0.6 — 2.0
Goldsboro Fine Sandy Loam,
0 — 14
2.0 — 6.0
2.0 — 3.0
26.0
(GoA)
14 — 58
0.6 — 2.0
58-67
0.2-2.0
Norfolk Loamy Fine Sand,
0-6
6.0 — 20
4.0 — 6.0
42.8
(NoA, NoB)
6 — 17
0.6 — 2.0
17-62
0.06-2.0
Wickham Sandy Loam,
0 — 12
2.0 — 6.0
> 6.0
5.5
(WB)
12 — 36
0.6 — 2.0
TTn T1 ♦
36-61
-- _ _
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(2) NRCS Web Soil Survey Area of Interest (AOI) tool.
3.2.2 Hydraulic Loading Rate
The following water balance approach will be used in estimating hydraulic loading rates:
Drainage + Evapotranspiration + Runoff = Precipitation + Irrigation
A. Soil Drainage
The soil drainage at the proposed land application site is estimated using the
geometric mean of the reported saturated hydraulic conductivities (permeabilities) of the most
restrictive soil horizon multiply by 4% reduction factor. The soil drainage using the geometric
mean of the reported saturated hydraulic conductivities (permeabilities) of the most restrictive
soil horizon multiplied by 4% reduction factor is estimated as follows:
Engineering Alternative Analysis 12 October 2013
for Discharge of Wastewater 3104-G
MCRWASA

Geometric Mean of Hydraulic Conductivities (Permeabilities)
Hydraulic Conductivity of
Soil Type Most Restrictive Soil Horizon Log
inch/hr (Hydraulic Conductivity)
Banneau Loamy Sand (BoB) 0.6-0.221848749
Banneau Loamy 0.6-0.221848749
Sand (BoC)
Goldsboro Sandy 0.2
-0.698970004
Loam (GoA)
Norfolk Loamy Fine 0.06-1.22184875
Sand (NoA)
Norfolk Loamy Fine 0.06-1.22184875
Sand (NoB)
ow Wickham Sandy 0.6-0.221848749
Loam WkB
Total =-3.80821375
The logarithm of geometric mean = — 3.80821375
6
_-0.6347
Geometric Mean of Hydraulic Conductivity = antilog (-0.6347)
imp
= 0.23 inch/hr
Soil Drainage= 0.23 in/hr x 0.04 x 24 hr/day x 30.4 days/month
A
= 6.77 inch/month
B. Evapotranspiration
The average monthly evapotranspiration rates used in the water balance are derived
from the publication "Weather and Climate in North Carolina", N.C. Agricultural Experiment
Station, Bulletin 396, 1971.
C. Runoff
Runoff is assumed to be zero in the water balance calculation.
D. Precipitation
Using the precipitation data provided in the Soil Survey of Martin County, published
by USDA, SCS, the 801h percentile yearly precipitation was used in water balance to derive
hydraulic loading rate (Table 2) and calculation of storage capacity requirement (Table 3).
E. Hydraulic Loading Rate and Required Field Area
From Table 2, using the water balance, the annual hydraulic loading rate is estimated
to be 63.21 inch/year (5.2675 ft/year).
Engineering Alternative Analysis 13 October 2013
for Discharge of Wastewater 3104-G
MCRWASA

a"
onq `
3.2.3 Land Requirement
am Using the decanted design wastewater flow of 0.320 mgd and the annual hydraulic
loading rate of 5.2675 ft/year, the actual field area required for disposal of decanted wastewater
by land application is estimated as follows:
Required Field Area, acres = 1,120 x Q, mgd
low Annual HLR, ft/year
1120 x 0.320 mgd
5.2675 ft/year
= 68.0 acres
ow Considering additional land area required for buffers, setback and access roads, a factor
of 1.5 is used to determine total land area required for land application site. Accordingly, the
total land area required for the land application site is:
= 68 acres x 1.5
102 acres
Considering available land parcels in close proximity of the water treatment plant and
low uneconomic remnants approximately 133 acres of land purchase will be required for disposal of
decanted water by land application.
Oft 3.2.4 Storage Requirement
Referring to Table 3, the maximum storage requirement is determined to be 0.07 inch.
"" Accordingly, using the water balance approach, the required storage capacity for land application
system is estimated as follows:
Required Storage Volume = 0.07 inch x 68 acres x 27,152 gal
acre - inch
0M = 129,244 gallon
The above storage requirements do not account for inclement weather conditions
(excessive precipitation, windy conditions, freezing conditions, etc.), cover crop maintenance
and site management activities when land application of decanted wastewater cannot take place.
Accordingly, as required by the State, at least 14 days of storage of design decanted wastewater
flow of 0.320 mgd will be provided. The required storage capacity is estimated as follows:
Required Storage Volume = 0.320 mgd x 14 days
= 4.48 Million Gallons
Engineering Alternative Analysis 14 October 2013
for Discharge of Wastewater 3104-G
MCRWASA

F" •
3.2.5 Cover Crop Selection for Land Application Site
no Fescue/Bermuda grasses over seeded with Rye grass in Winter months will be considered
as cover crops for proposed land application system:
4M
am
a*
oft
ow
AM
Engineering Alternative Analysis 15 October 2013
for Discharge of Wastewater
3104-G
MCRWASA

AM
TABLE 2
WATER BALANCE TO DERIVE HYDRAULIC LOAnTVV V ATr
.■
Water Losses
Water Applied
Month
Evapo-
t rans iration in
p { )
Drainage (in)
Total Water
Preci P-
Effluent
Total Water
as
(1}
(2)
(3)
Losses (in)
itation (in)
Applied (in)
Applied (in)
January
0.93
(2) + (3) = (4)
(5)
-(4)-( )=(6)
(5) + (6) = (7)
6.77
7.70
4.26
3.44
7.70
February
1.68
6.77
8.45
4.07
4.38
8.45
'm
March
2.79
6.77
9.56
4.47
5.09
9.56
April
3.60
6.77
10.37
3.60
6.76
10.37
am
May
4.65
6.77
11.42
5.02
6.39
11.42
June
5.10
6.77
11.87
4.79
7.08
11.87
0M
July
4.96
6.77
11.73
6.40
5.33
11.73
August
4.34
6.77
11.11
6.44
4.67
11. l 1
,.�
September
3.60
6 77
10.37
4.99
5.38
10.37
October
2.17
6.77
8.94
3.80
5.14
8.94
November
1.50
6.77
8.27
2,98
5.28
8.27
December
0.93
6.77
7.70
3.43
4.26
7.70
'
Total
Annual
36.25
81.21
117.46
54.25
63.21
117.46
4W
TABLE 3
CALCULATION OF STORAGE CAPACITY REQUIREMENT PER
ACRE OF FIELD
AREA
Month
Effluent
Precip-
Cumulative
Total Water
{ 1)
Available (in)
itation (in)
=Available
Losses in
( )
Storage (in)
Storage (in)
(2)
(3)
(5}
(4) - (5) _ (6)
{7)
September
3.51
4.99
8.50
10.37
-1.87
0.00
October
3.51
3.80
7.31
0.00
8.94
-1.63
+�
November
3.51
2.98
6.49
0.00
8.27
-1.77
December
3.51
3.43
6.94
7.70
-0.75
0.00
..n
January
3.51
4.26
7.77
0.07
7.70
0.07
February
3.51
4.07
7.58
0.00
8.45
-0.87
ow
March
3.51
4 47
7.98
0.00
9.56
-1.58
April
3.51
3.60
7.11
0.00
10.37
-3.25
May
3.51
5.02
8.53
0.00
11.42
-2.88
me
June
3.51
4.79
8.30
11.87
-3.57
0.00
July
3.51
6 40
9.91
0.00
11.73
-1.82
�•�►
August
3.51
6.44
9.95
11.11
- l .16
0.00
Engineering Alternative Analysis
16
«w
for Discharge of Wastewater
October 2013
MCRWASA
3104-G

M"
3.2.6 Spray Irrigation System
The spray irrigation system will consist of a spray irrigation pump station, flow metering
and sampling, and a solid set sprinkler type spray irrigation system. The spray irrigation i in
PP g
will be arranged such that it will allow the irrigation fields to be alternated for proper disposal of
� p
decanted wastewater by land application. The sprinklers will be arranged such that the desired
buffer zones are maintained and even distribution of wastewater on each spray irrigation field is
achieved.
3.2.7 Description
The principal components of this alternative are described as follows:
I. Provide decant facilities and associated piping with modulating valves for control of
withdrawal of decants from the super pulsator clarifiers' waste storage tank and filter
backwash/filter to waste/sampling waste storage tank and discharge of decants to the
decant wastewater transfer pump station.
2. Provide 640 LF of 8-inch force main for pumping the decant wastewater from the
decant transfer pump station to the 4.48 MG decant water storage basin.
3. Provide two (2) 2.24 MG, each, pre -stressed concrete storage tanks with covers to
provide the required total 4.48 MG decanted wastewater storage facilities to store the
decanted wastewater when land application of the decanted water cannot take place
due to inclement weather conditions, not having desired groundwater level conditions
at the land application site, and cover crop and land management activities at the land
application site.
4. Provide a spray irrigation pump station, necessary header lines and solid set sprinkler
type spray irrigation system. The spray irrigation pump station will include three (3)
vertical turbine pumps each rated at 1,425
manually controlled variable frequencydrive.The
pumand will be equipped with a
equipped with a magnetic flow meter and a sampler for monitoringstation will also be
and collection of irrigated water samples to determine hydraulic loading
grateated flow
analysis of water samples as required by non -discharge permit issued and
NCDWQ. P y the
5. Provide solid set sprinkler type spray irrigation system to irrigate total wetted area of
68 acres. Based upon the water balance, the design annual irrigation or hydraulic
�» loading rate for disposal of decanted water by land application is 63.21 inch/year
(1.25 inch/week). The cover crops at the land application site will be coastal
Bermuda grass over seeded with Rye grass in Winter months.
6. Provide land and cover crops management equipment for the land application site.
AM 7. Provide equipment storage and hay storage buildings or sheds at the land application
site.
a*
Engineering Alternative Analysis 17
�+ for Discharge of Wastewater Goober 2013
MCRWASA 3104-G

a"
� s
..,,
3.2.8 Construction Cost Opinion
Floating Decanters / Precast Valve Boxes / Flow Control Valves
$ 166,000.00
..
Decant Transfer Pump Station and Associated Piping
116,500.00
640 LF 8-inch Force Main to Transfer Decant Wastewater from the
Decant Pump Station to 4.48 MG Storage Basin
16,000.00
Two (2) 2.24 MG capacity, each, Pre -Stressed Decant Storage Tanks
2,326,000.00
Spray Irrigation Pump Station
250,000.00
Flow Metering and Sampling
20,000.00
ON"
Spray Irrigation Piping and Solid Set Sprinkler System
1,158,000.00
Sitework and Spray Field Preparation
6,000.00
Cover Crop Planting / Seeding
30,500.00
Access Bonds
50,000.00
�.,
Fencing
15,000.00
Equipment Shed and Hay Storage Shed
80,000.00
Electrical and Controls
45,000.00
Mobilization / Bond / Insurance (4.0%)
171,000.00
Total Construction Cost
$ 494509000.00
Contingencies (10%)
445,000.00
..►
Engineering Design
303,500.00
Construction Administration and Observation
180,000.00
Geotechnical Investigation
7,500.00
Soil Scientist Site Evaluation
10,000.00
�►
Environmental Permitting
5,000.00
Start -Up Services
5,000.00
�*
Operation and Maintenance Manual
7,500.00
Bond and Counsel and Legal Fees
7,500.00
�!
Site Management Equipment
150,000.00
Land: 135 acres @ $10,000/acre
135,000.00
Interest During Construction
240,722.00
Total Project Cost
$ 599469722.00
Engineering Alternative Analysis 18
October 2013
for Discharge of Wastewater
3104-G
MCRWASA

a"
3.2.9 Annual Operation and Maintenance Costs
Salaries, including fringe benefits
$ 51,500.00
.q
Electrical
9,500.00
Chemicals (lime, weed and insect controls)
4,500.00
Maintenance / Capital Outlay / Miscellaneous
3,5_
Total Annual Operation and Maintenance Costs
$ 699000.00
3.2.10 Economic Analysis
A. Basic Considerations
1. Planning Period, year
= 20
2. Capital Cost of the Project
= $ 5,946,722.00
3. Annual Operation and Maintenance Costs
4. Interest Rate, percent
= 69,000.00
_
— 3.375
5. Single Payment Present Worth Factor at 3.375% Interest
+
Rate for 20 Years =
0.51486
6. Uniform Series Present Worth Factor at 3.375% Interest
Rate for 20 Years
14.37373
7. Land Appreciation Single Payment Present Worth Factor at
2.0% for 20 Years
=
8. Estimated Salvage Value:
1.48594
The following salvage value is estimated using 30-year average life of the entire
decants collection, transfer and land application system and land appreciation at
2.0 percent interest rate for a 20-year planning period.
ass
Decant Collection Transfer and Land Ap2lication System.
..,
_ $(4,450,000 — 171,000) x (1 - 20) _
$ 1,426,333.00
30
Land Appreciation:
_ $135,000.00 x 1.48594
=
200 602.00
Total Estimated Salvage Value =
$ 1,626,935.00
B. Present Worth Cost
I. Initial Project Cost =
$ 5,946,722.00
A.
2. Present Worth of Annual O&M Costs
$69,000.00 x 14.37373 =
991,787.00
Engineering Alternative Analysis 19
�++
for Discharge of Wastewater
October 2013
MCRWASA
3104-G

3. Present Worth of Salvage Value
$1,626,935.00 x 0.51486
Net Present Worth Cost (1 + 2 — 3)
837,644.00
$ 691009865.00
Engineering Alternative Analysis 20 October 2013
4 for Discharge of Wastewater 3104-G
MCRWASA

1 1 1 ! I 1 1 1 I I 1 I ) I I 1 I t
3 MCU II ML 1 1 i
PAr WAIEA % RM. LOP Lli'i 2 MLO YETA MU 2 M6O MGO
RYP SiATW ILLYRYQR 5 TrA�p1 OOYW. 9VEP RLSAiCM 6AM1fIEP YEOA N.IFAS MtlO1E MGP OEYUL
sEEO vAui mrtAtt rEm vuP.r
s
___KW_ SLIC_Q LF_GNl 26.SOO CY0 I 1
LM
EXHIBIT 4
Alternate No. 2
Schematic Flow Diagram for Disposal of
Decant Water by Land Application
]OJ.Lm WLLCP
i1P9EO
rArEP
fi1plNI SrO11.�
PLQOW ORILW
TAN(
SVA/.v IWEN.Tp SYSRL
TV
THE WOOTEN COMPANY
141i0Mr1A POM1�nMvs„&EWiI M.li6i3 ilia
FIf B18i5AI 1e915E1:liPo

M\} l
EXHIBIT 5
Alternate No 2
THE WOOTEN COMPANY
Martin County Regional Water And Sewer Authority
Decant Water Disposal to Spray Irrigation System a 5W 1ow
V.taw-r t

ag0y�
,�,a
EXHIBIT 6
Alternate No 2
Martin County Regional Water And Sewer Authority
Decant Water Disposal to Spray Irrigation Area
WATER
PLANT TREATMENT
IRRIGATIOPITE N d�
/ l �J
THE WOOTEN COMPANY
0 S00' 1000' 'S W:WemMr.Manyn c'n�s
1'.10001-0' hr�-�� sia!ze rns� ma�aeu;u+ -
I

3.3 Alternative No. 3
go This alternative (Exhibits 7 and 8) considers disposal of decanted wastewater from the
super pulsator clarifiers' waste sludge storage tank and the filter backwash waste/filter to
am waste/sampling waste storage tank to the Unnamed Tributary of Sweetwater Creek in Roanoke
River basin. The detailed description and cost analysis of this alternative are provided as
am follows:
3.3.1 Description
AM The principal components of this alternative are described as follows:
1. Provide decant facilities and associated piping with modulating valves for control of
OM decants withdrawal from the super pulsator clarifiers' waste sludge storage tank and
filter backwash waste/filter to waste/sampling waste storage tank and discharge of
decants to the pump station.
2. Provide a duplex 500 gpm capacity decant and pump station and necessary piping for
pumping decants to the dechlorination contact tank.
3. Provide dechlorination facilities consisting of a 300 gallon bulk storage tank to store
dechlorination chemical (30% solution of Calcium Thiosulfate), two (2) peristaltic
variable speed output metering pumps each rated at 0.8 to 17.0 gallon/day at 25 psi
�► maximum pressure head, dechlorination contact tank, and necessary piping, housing
and controls.
4. Provide flow metering and sampling facilities to monitor discharge to the unnamed
'''
tributary to the Sweetwater Creek.
5. Provide 350 LF of 12-inch gravity sewer for discharge of dechlorinated decanted
�.
water to the Unnamed Tributary of Sweetwater Creek.
3.3.2 Construction Cost Opinion
MR
Floating Decanters / Precast Valve Boxes / Flow / Control Valves
$ 166,000.00
Decant Pump Station
110,000.00
�.
Dechlorination Facilities
41,000.00
Flow Metering and Sampling
15,000.00
�.
Sitework and Piping
13,500.00
350 LF of 12-inch Effluent Outfall
12,500.00
Electrical and Controls
30,000.00
Mobilization / Bond / Insurance (4.0%)
15,500.00
Total Construction Cost
$ 403,500.00
Contingencies (10%)
40,350.00
Engineering Design
39,866.00
Engineering Alternative Analysis 24
October 2013
for Discharge of Wastewater
3104-G
MCRWASA

w
Construction Administration and Observation
54,000.00
�►
Operation and Maintenance Manual
3,000.00
Start -Up Services
2,000.00
�►
Interest During Construction
4,580.00
Total Project Cost
$ 5479296.00
3.3.3 Annual Operation and Maintenance Costs
Salaries, including fringe benefits
$ 22,000.00
Electrical
2,500.00
Chemicals (CAPTOR, 30% Calcium Thiosulfate)
3,000.00
Maintenance and Miscellaneous
2,500.00
Total Annual Operation and Maintenance Costs
$ 309000.00
3.3.4 Economic Analysis
A. Basic Considerations
1. Planning Period, year =
20
2. Capital Cost of the Project =
$ 547,296.00
3. Annual Operation and Maintenance Costs =
30,000.00
4. Interest Rate, percent =
3.375
5. Single Payment Present Worth Factor at 3.375% Interest
Rate for 20 Years =
0.51486
6. Uniform Series Present Worth Factor at 3.375% Interest
Rate for 20 Years =
14.37373
7. Estimated Salvage Value:
_ $(403,500 — 15,500) x (1 - 20) _
30
$ 129,332.00
B. Present Worth Cost
1. Initial Project Cost =
$ 547,296.00
2. Present Worth of Annual O&M Costs
$30,000.00 x 14.37373 =
431,212.00
3. Present Worth of Salvage Value
$129,332.00 x 0.51486 =
66,588.00
Net Present Worth Cost =
$9119920.00
+^
Engineering Alternative Analysis 25
October 2013
for Discharge of Wastewater
3104-G
MCRWASA

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EXHIBIT 7
Alternate No. 3
Martin County Regional Water And Sewer Authority
Decant Water Disposal to Tributary of Sweetwater Creek
.RWG O®.
2 MGC
»o,000 aLLw
fIMpED
•11ER
S
1MN
� 2 MCU
THE WOOTEN COMPANY
newie vc.altirs esnM�cnew-iuf R
419[ffi4v11 Ia9W6M.39

8;-dS,qJ{AR
UT
EKE
SLUDGE' / J
� � r•� / � r` \ � STOAAGEJTANN-'
FILTER CKWA
J ,
ST09AGE TAW
rL
PLL
O . //:
`\\` srp�oN,J
EXHIBIT 8
Alternate No 3
THE WOOTEN COMPANY
Martin County Regional Water And Sewer Authority
A-11111111
Decant Water Disposal to Tributary of Sweetwater Creek ^ 5W rmr
rraar-v

3.4 Alternative No. 4
As a part of reduction or elimination of wastewater discharge to surface water, this
alternative considering the reuse of decanted wastewater from the water plant's residual and
filter backwash storage tanks was also evaluated under Alternative No. 2. For details, refer to
Alternative No. 2 given in Section 3.2 of this report. MCRWASA also evaluated the potential
�+ for reuse of decanted wastewater for commercial/industrial cooling water needs and other uses
such as irrigation of athletic fields in their service area. However considering the factors such as:
(1) lack of potential customers in the service area that require large quantities of reclaimed water
for cooling water needs, and (2) athletic fields are not located in close proximity of the reclaimed
water source at MCRWASA WTP, this alternative considering the reclaimed water reuse in the
service area was deleted from further consideration.
3.5 Selection of the Alternatives
The present worth cost analysis of the alternatives evaluated in Section 3.0 is summarized
in Table 4 below:
TABLE 4
SUMMARY OF THE PRESENT WORTH COST ANALYSIS FOR ALTERNATIVES
ALTERNATIVES
ECONOMIC PARAMETERS
ALT. NO.1
ALT. NO.2
ALT. NO.3
1. Capital Cost of the Project
$ 512,800
$ 5,946,722
$ 547,296
2. Annual O&M Costs
415,000
69,000
30,000
3. Estimated Salvage Value
122,167
1,626,935
129,332
4. Present Worth of Annual O&M Cost
5,965,098
991,787
431,212
5. Present Worth of Salvage Value
62,899
837,644
66,588
6. Net Present Worth Cost
$ 6,414,999
$ 6,100,865
$ 911,920
Considering the above present worth cost analysis, Alternative No. 3 which considers
discharge of decant water to the unnamed Tributary of Sweetwater Creek in Roanoke River basin
provides the most cost-effective solution for disposal of decant water generated from the
MCRWASA 2.0 MGD conventional water treatment plant. Accordingly, it is recommended that
MCRWASA submit this Engineering Alternative Analysis as supporting documentation for the
NPDES Permit application for discharge of decanted water to the Unnamed Tributary of
Sweetwater Creek in Roanoke River basin.
Engineering Alternative Analysis 28 October 2013
for Discharge of Wastewater 3104-G
MCRWASA

NPDES PERMIT APPLICATION - SHORT FORM C - WTP
For discharges associated with water treatment plants
Mail the complete application to:
N. C. Department of Environment and Natural Resources
Division of Water Quality / NPDES Unit
1617 Mail Service Center, Raleigh, NC 27699-1617
NPDES Permit Number NC00
If you are completing this form in computer use the TAB key or the up - down arrows to move from one
field to the next. To check the boxes, click your mouse on top of the box Otherwise, please print or type.
1. Contact Information:
Owner Name
David Bone, Chairman
Facility Name
Martin County Regional Water and Sewer Authority (MCRWASA)
Mailing Address
305 East Main Street (P.O. Box 668)
City
Williamston
State / Zip Code
NC, 27892-0668
Telephone Number
[phone]
Fax Number
[phone]
e-mail Address
[e-mail]
2. Location of facility producing discharge:
Check here if same as above ❑
Street Address or State Road 1001 Park Street
City
Williamston
State / Zip Code
NC, 27892
County
Martin
3. Operator Information:
Name of the firm, consultant or other entity that operates the facility.
(Note that this is not referring to the
Operator in Responsible Charge or ORC)
Name Martin County Regional Water and Sewer Authority (MCRWASA)
Mailing Address 305 East Main Street (P.O. Box 668)
City Williamston
State / Zip Code NC, 27892-0668
NJ
Telephone Number [phone]
Fax Number [phone]
4. Ownership Status: Pa(tT
Federal ❑ State ❑ Private ❑ Public
Page] of4 Version 5/2012

NPDES PERMIT APPLICATION - SHORT FORM C - WTP
For discharges associated with water treatment plants
5. Type of treatment plant:
® Conventional (Includes coagulation, flocculation, and sedimentation, usually followed by
filtration and disinfection)
❑ Ion Exchange (Sodium Cycle Cationic ion exchange)
❑ Green Sand Filter (No sodium recharge)
❑ Membrane Technology (RO, nanofiltration)
Check here if the treatment process also uses a water softener ❑
6. Description of source water(s) (i.e. groundwater, surface water)
Surface water (Roanoke River)
7. Describe the treatment process(es) for the raw water:
The raw water is initially pumped from the Roanoke River to a raw water reservoir for
storage. The water is then sent to a low lift pump station where sodium permanganate
(NaMn04) is added for pre -oxidation. Afterward, water is pumped to a chemical feed vault where
Powdered Activated Carbon (for TOC removal), caustic (for pH adjustment), and alum (for
coagulation) are added to the water. The water is then sent to a Super Pulsator Clarifier for
clarification where polymer can be added for enhanced clarification. Prior to filtration chlorine
and caustic can also be fed for disinfection and pH/Alkalinity adjustments, respectively. The
water is then filtered and flows to the chlorine contact tank for disinfection. Afterward, a
corrosion inhibitor is added before the water flows to a 300,000 ground storage tank. The water
is then pumped to a 400,000 gallon elevated storage tank from where it enters the distribution
system. The waste sludge generated from the super pulsator clarifiers is discharge to the
sludge storage tank for gravity thickening and decanting operations. The wastewater generated
from filter backwash/filter to waste/sampling operations is discharged to filter backwash
storage tank for equalization, solids settling and decanting operations. The gravity thickened
sludge from both the sludge storage tank and filter backwash storage tank will be periodically
disposed of by land application. The decanted water from the sludge holding tank and the filter
backwash storage tank will be de -chlorinated and discharged to the Unnamed Tributary to
Sweetwater Creek in Roanoke River Basin. Exhibit 1 shows the Schematic Flow Diagram of the
proposed MCRWASA 2.0 MGD Water Treatment Plant.
S. Describe the wastewater and the treatment process(es) for wastewater generated by the
facility:
The waste generated at the water treatment plant will include: (1) waste sludge from super
pulsator clarifier, (2) wastewater from filter backwash, filter to waste and sampling operations,
and (3) waste from sanitary facilities. The waste sludge generated from the super pulsator will
be discharged to 529,300 gallon capacity sludge storage tank for gravity thickening and
decanting operations. The wastewater generated from filter backwash, filter to waste, and
sampling operations will ne discharged to 529,300 gallon capacity filter backwash storage tank
for equalization, solids settling and decanting operations. The wastewater generated from the
sanitary facilities at the water treatment plant will be discharged to the Town of Williamston
sewer system. The gravity thickened sludge from both the sludge storage and filter backwash
storage tanks will be periodically disposed of by land application, using a private contractor
engaged in disposal of residuals by land application. The decants from the sludge storage tank
and the filter backwash storage tank will be de -chlorinated and discharged to the Unnamed
Tributary to Sweetwater Creek in Roanoke River Basin (Exhibits 7 and 8, included in the
attached Engineering Alternative Analysis)..
9. Number of separate discharge points: 1
Outfall Identification number(s) 1
Page 2 of 4 Version 5/2012

• NPDES PERMIT APPLICATION - SHORT FORM C - WTP
For discharges associated with water treatment plants
10. Frequency of discharge: Continuous ❑ Intermittent
If intermittent:
Days per week discharge occurs: 7 Duration: Variable
11. Plant design potable flowrate 2.0 MGD
Backwash or reject flow 0.320 MGD
12. Name of receiving stream(s) (Provide a map showing the exact location of each outfall, including
latitude and longitudep.
Unnamed Tributary of Sweetwater Creek;
OutfeM Location: 35050153.0667"N-77002139.2514"W
13. Please list all water treatment additives, including cleaning chemicals or disinfection
treatments, that have the potential to be discharged.
Alum / aluminum sulfate Yes
Iron sulfate / ferrous sulfate No
Fluoride No
Ammonia nitrogen / Chloramines No
Zinc -orthophosphate or sweetwater CP1236 No
List any other additives below:
Sodium permanganate (NaMn04)
Powdered Activated Carbon (PAC)
Sodium hydroxide (caustic)
Polymer
Chlorine
14. Is this facility located on Indian country? (check one)
Yes ❑ No
15. Additional Information:
Provide a schematic of flow through the facility, include flow volumes at all points in
the water treatment process. The plan should show the point[s] of addition for
chemicals and all discharges routed to an outfall [including stormwater].
Solids Handling Plan
16. NEW Applicants
Information needed in addition to items 1-15.
Page 3 of 4 Version 5/2012

° NPDES PERMIT APPLICATION - SHORT FORM C - WTP
For discharges associated with water treatment plants
New applicants must contact a permit coordinator with the NCDENR Customer
Service Center.
Was the Customer Service Center contacted? ® Yes ❑ No
Analyses of source water collected
Engineering Alternative Analysis
Discharges from Ion Exchange and Reverse Osmosis plants shall be evaluated using a
water quality model.
17. Applicant Certification
I certify that I am familiar with the information contained in the application and that to the
best of my knowledge and belief such information is true, complete, and accurate.
Shankar R. Mistry Senior Process Design Engineer
Printed name of Person Signing Title
4%-k"-itcL-%Y R. M�s4yj
Signature of Applicant
fu.1a Gi io13
Date
North Carolina General Statute 143-215.6 (b)(2) provides that Any person who knowingly makes any false statement representation, or certification in any application,
record, report, plan, or other document files or required to be maintained under Article 21 or regulations of the Environmental Management Commission implementing that
Article, or who falsifies, tampers with, or knowingly renders inaccurate any recording or monitoring device or method required to be operated or maintained under Article 21
or regulations of the Environmental Management Commission implementing that Article, shall be guilty of a misdemeanor punishable by a fine not to exceed $25,000, or by
imprisonment not to exceed sic months, or by both. (18 U.S.C. Section 1001 provides a punishment by a fine of not more than $25,000 or imprisonment not more than 5
years, or both, for a similar offense.)
Page 4 of 4 Version 5/2012

ENGINEERING ALTERNATIVE ANALYSIS
for
DISCHARGE OF WASTEWATER
from
MCRWASA 2.0 MGD CONVENTIONAL WATER TREATMENT
PLANT
Martin County Regional Water and Sewer Authority
Town of Williamston, North Carolina
MAY 2013
B"uo M . kh&d&& 0/6/ 3
Dustin M. Rhodes, E.I.
l{t�iyll.Pl/P�.
`,
rt
e s s,a•; may':•
cn t 8089 r
' � �'�.2G I N EE¢ •'�Q
f2. M�'ti G/G/Jell
Shankar R. Mistry, Ph.D., P.E.
THE WOOTEN COMPANY
ENGINEERING PLANNING I ARCHITECTURE
120 North Boylan Avenue Raleigh NC 27803-1423
919.828.0531 fax [phone]
Twc 3104-G