NC0086932_Application_20010111

x , . Hobbs, Upchurch & Associates, P.A.
KK Consulting Engineers
ax
2522 S.Croatan Highway • Suite 2A • P.O.Drawer 1929 • Nags Head,North Carolina 27959
January 11, 2001
,U FEB 1 6 2001
Susan A. Wilson By 33\Aka 1 b
NCDENR—Division of Water Quality
NPDES Unit
1617 Mail Service Center
Raleigh,NC 27699-1617
RE: NPDES Permit Application
Stumpy Point Water and Sewer District RO Plant
NPDES Permit No. NC0086932
HUA No.: DR0004—Permits
Dear Ms. Wilson:
We would like to update you on water quality data that pertains to the NPDES permit
application for the Stumpy Point RO plant.
In November 2000, we drilled a production well on the treatment plant site that is one of
two that will be used for the project. Attached please find the Severn Trent Laboratory
analysis of that water. It differs slightly from our original test well that was located about
one mile away.
Mr. Ian Watson, who is the Dare County consulting engineer for process design, has
stated that the pressure filters will not be needed since the iron and turbidity is lower than
the original test well. This will reduce our discharge volume by about 4,000 gallons per
day (gpd) and also the iron components associated with a pressure filter backwash. Mr.
Watson has also stated that the concentrate stream of(20.5 gpm or 29,520 gpd) will
consist of elements approximately 2.75 times the feedwater concentration. I have
prepared a table for you that contains the projected discharge concentration of the
elements analyzed in our raw water. Also attached is Mr. Watson's process flow table. I
have highlighted the concentrate/discharge column.
In the original permit application, copper and zinc were erroneously circled as additives
to the waste stream. Please ignore that delineation. The process waste stream does not
contain additives containing copper or zinc.
Nags Head,NC • Telephone [phone] • Fax [phone] • e-mail: [e-mail]
Southern Pines • Myrtle Beach • Raleigh • Charlotte

1
•
Hobbs, Upchurch & Associates, P.A.
,a rk Consulting Engineers
z. • • •
2522 S.Croatan Highway • Suite 2A • P.O.Drawer 1929 • Nags Head,North Carolina 27959
January 11,2001
Susan A. Wilson
NCDENR—Division of Water Quality
NPDES Unit
1617 Mail Service Center
Raleigh,NC 27699-1617
RE: NPDES Permit Application
Stumpy Point Water and Sewer District RO Plant
NPDES Permit No. NC0086932
HUA No.: DR0004 —Permits
Dear Ms. Wilson:
We would like to update you on water quality data that pertains to the NPDES permit
application for the Stumpy Point RO plant.
In November 2000, we drilled a production well on the treatment plant site that is one of
two that will be used for the project. Attached please find the Severn Trent Laboratory
analysis of that water. It differs slightly from our original test well that was located about
one mile away.
Mr. Ian Watson, who is the Dare County consulting engineer for process design, has
stated that the pressure filters will not be needed since the iron and turbidity is lower than
the original test well. This will reduce our discharge volume by about 4,000 gallons per
day (gpd) and also the iron components associated with a pressure filter backwash. Mr.
Watson has also stated that the concentrate stream of(20.5 gpm or 29,520 gpd) will
consist of elements approximately 2.75 times the feedwater concentration. I have
prepared a table for you that contains the projected discharge concentration of the
elements analyzed in our raw water. Also attached is Mr. Watson's process flow table. I
have highlighted the concentrate/discharge column.
In the original permit application, copper and zinc were erroneously circled as additives
to the waste stream. Please ignore that delineation. The process waste stream does not
contain additives containing copper or zinc.
Nags Head,NC • Telephone [phone] • Fax [phone] • e-mail: [e-mail]
Southern Pines • Myrtle Beach • Raleigh • Charlotte

•
Susan A. Wilson
HUA No.: DR0004—Permits
January 11,2001
Page 2
We hope this updated information will be helpful to you in evaluating this permit
application.
Thank you for your attention to this matter.
Sincerely,
HOBBS,UPCHURCH&ASSOCIATES,P.A.
Edward Lawler
EFL/hb
Attachments
Cc: Bob Oreskovich, Utilities Director,Dare County Water Department
IP DARE CofMlrD10000dSTU1diMAW'COM/4MM IIATF.1STSTE.M000PEFASTSV•CDENRWATEtQUAI177Wfo6wE0117111zwl.au

•
Ed Lawler
From: Eric Weatherly
Sent: Wednesday, January 10, 2001 3:57 PM
To: Ed Lawler
Subject: FW: Stumpy Point
From: Ian Watson[SMTP:[e-mail]]
Sent: Friday,January 05,2001 12:08 PM
To: Eric Weatherly
Subject: Fw:Stumpy Point
STUMPY
DISCTIAAGE.zip
----- Original Message-----
From: Ian Watson <[e-mail]>
To: Eric Weatherly<[e-mail]>
Cc: Robert W. Oreskovich <BobO©co.dare.nc.us>
Sent: Friday,January 05, 2001 11:41 AM
Subject: Stumpy Point
> Eric, attached is a zip file for PFD3, RO only flow sheet.
> I reviewed both analyses, the one done by CDM/Missimer, and the one by
Bob's
> lab. Both a little off regarding balance, and significantly different
> regarding turbidity. However, I think we can at this point say that there
>will be no media filters, and thus no backwash to dispose of.You will
note
>that the quality is different for the concentrate, and recovery is 65%.
This
> means that the concentration factor for estimating heavy metals, etc, is
> about 2.75. Some of these metals were given in the analyses, but not all.
> Because of the color, and consequent D/DBP issues, I have cut the blend to
>4gpm,to keep color in the product<15.This has changed the flows a little
> bit but not much. We will not need acid in the feedwater, but may have to
> add a little calcium chloride to the product for rehardening a little.
This
>decision will come during final design, and does not have a thing to do
with
>the NPDES permit application! I just thought I would mention it.
> Let me know if you need anything else, I'll be in Tampa next week,
regards,
> Ian.
1

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LOG NO: BO-63363
Received: 16 NOV 00
Reported: 26 NW 00
Mr. Scott. Manahan
Miseimer International. Inc. Client Po. No. : SFIs-912
6140 College Parkway, Suite 202
Sort Myers, TL 33919 .
Projcct: DARE CO. WATER IIS?T
Sampled Ey: Client
Code: 0!1301128
REPORT OV RSSUL?S Page 1
DATE/
LOG NO SA$PLY DESCRIPTION . LIQUID SAMPLES TIM SAMPLpD
63363-1 DARK COUNTY 11-14-00/11145
PARAMETER 63363-1
Fluoride (340.2) , mg/1 0.50
Analysis Date 11.20.00
Sulfate as SO4 (375.4) , mg/I <5.0
Analysis Dile 11.16.00
Total Dissolved Solids (160.1) . mg/1 1000
Analysis Date 11.17.00
Alkalinity (to pH 4.6) as CaCO3 (310.1) . mg/1 660
Analysis Date 11.21.00
Turbidity (160.1) , IVTu s.s
Analysis Date 11.15.00
Sulfide (376.2) , mg/1 .i3.10
Prep Date 11.21.00
Analysis Date 11.21.00
Silica as Si02, mg/1 23
Prep Data • 11.17.00
Analysis Date 11.27.00
florae. mg/1 1.3
Prep Date 11.17.00
Analysis Date 11.20.00
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• LOG NO: 80-63363
Received: 1S NOV 00
Reported: 28 NOV CO
Mr. Scott Manahan
Miseimer interlational, Inc. Client PO. No. : FR6-812
8140 College Parkway, Suite 202
Port P.yers, Fl. 33019
Project: DARE CO. NATER DEPT
Sampled By: Client
Code: 091501126
.REPORT oF RESULTS Page 2
DATE/
LOG NO SAMPLT DSSCRIPT'ION , LIQUID SAMPLr8 TIVZ SAMPLED
63363-1 DAPS COUNTY 11-14-00/11:45
PARAMETER 63363-1
copper (Solo) , mg/1 <0.020
PTap Date 11.17.00
Analysis Date 11.20.00
Iron (6010) , tag/1 0.71
Prep Date 11.17.00
Analysis Data 11.20.00
Nickel (6010) , mg/1 c0.040
Prep Date 11.17.00
•
Analysis Date 11.20.00
Manganese (6010) , mg/1 0.027
Drep Date 11.17.00
Analysis Date 11.20.00
Sodium (6010) , mg/1 460
Prop Date 11.17.00
Analysia Date 11.22.00
Zinc (6010) , mg/1 c0.020
Prep Date 11.17.00
Analysis Date 11.20.00
Strontium (6010), mg/1 0.083
Prep Date 11.17.00
Analysis Data x1.20.00
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LOG NO; 30-63363
Recaired: Is NOV 00
Reported: 28 NOV 00
Kr. Scott Manahan
Missirper International, Inc. Client Po. tto.: FH8-912
8140 college Parkway, Suite 202
Fort MyaY1, FL 33919 •
Px•oj ect 4 DARE CO. WATER DEPT
Sampled 8y: Client
Code: 091501128
REPORT OP RESULT. Page 3
• DATE/
LOO NO SAMPLE DESCRIPTION , LIQIIID SAMPLES TIP* SAMPLED
67363-1 DARE COUNTY 11-14-00/11:45
PARAMETER 63363-1
Calcium (6010) , pig/1 5.6
Prep Data 11.17.00
Analysis Date 11.20.00
Magnesium (6010) , mg/1 7.6
Prep Date 11.17.00
Afalyair Date 11.20.00
Color (110.2) , PCV 160
Analysis Date 11.15.00
Bicarbonate Alkalinity as CaCO3 (23202) , mg/1 660
Analysis Date 11.21.00
Bromide (300.0) . mg/1 1.1
Prep Date 11.17.00
Analysis Date 12.17.00
Chloride (315.3)
Chloride, mg/1 230
Analysis Date 11.17.00
Hardness as CaCO3 (6010)
Hardness as CaCO3. mg/1 45
Prep Date 11.17.00
Analysis Date 11.20.00
5TL limps 1443.1 is a pre,re Sewn'Ten[Lrbotatain.h'c.
01/04/01 07:53 TX/RX NO.9705 P.007

INCy.30.2000 40:12AM C. 'iSSIMER INTL1BS 813 NO.13740 P.5M/1?f
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LOG ND: BO-63363
Received: 1.5 NOV 00
Reported: 28 NOV Co
Mr. Scott Kanehaa
Missimer International, Inc. Client PO. No. : P1i8-812
6140 College Parkway, Suite 202
Fort I.1yers, FL 33919 •
Project: DARE CO. WATER DEPT •
Sampled By: Client
•
Code: 091501128
REPORT OF AZ6IILTS Page 4
DATE/
LOG NO SAMPLE DESCRIPTION , LIQt7ID SAMPLES TIME SAMPLED
63363-1 DARE COUNTY 3.1-14-00/11:45 •
PARAMETER 63363-1
Noncarbonata Hardnaaa as CaCO3
Hardness as CaCO3, mg/1 43 .3
Prep Date 11.17.00
Arlalyrie Date 11.20.00
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01/04/01 07:53 TX/RX NO.9705 P.008

STUMPY POINT RAW WATER ANALYSIS (11/20/00) AND .
DISCHARGE CONCENTRATION (PROJECTED)
RAW WATER ANALYSIS EFFLUENT PROJECTION
PARAMETER CONCENTRATION (mg/I) X2.75 CONCENTRATION
Non Carb Hardness <3.3 N/A
Calcium 5.6 15.4
Magnesium 7.6 20.9
Color (pcu) 160 440
Alkalinity 660 1815
Bromide 1.1 3.025
Chloride 210 577.5
Hardness 45 123.75
Copper <.020 N/A
Iron 0.71 1.9525
Nickel <.040 N/A
Manganese 0.027 0.07425
Sodium 460 1265
Zinc <.020 N/A
Strontium 0.083 0.22825
Fluoride 0.5 1.375
Sulfate <5.0 N/A
TDS 1000 2750
Turbidity 8.5 23.375
Sulfide <.1 N/A
Silica 23 63.25
Boron 1.3 3.575
•
I

PROCESS FLOW CHART - REVERSE OSMOSIS
STREAM# 1 2 3 4 5 6 7 8 9
DESCRIPTION RAW WARR R0 NO FEED NO Mal! WAS 000ONCONIAT! P07000TTOSTOPME OISTR u all 20S
FLOW,GPM its SLS SIS 71 4 20.E a 10 10
PRESSJR .psIg 40 20 200 10 10 10 10 a 10
IDS,m9/1 1530 1570 1570 30 1530 4320 125 12S 4320
PIPE DIAMETER r r r r 1' 1.1/2' r r r
MATERIAL 501 10 PIC 50100 FVC s0110S 3101 SS sa 00 PIC 50110 PIC 501 10 PIC 501100 roc 501 10n'c 50110 NC
Ian C.Watson PE,ROSTEK ASSOCIATES INC1/5/2001 2:14 PNPFD7.Awp
•
1

Hobbs, Upchurch & Associates, P.A.
Consulting Engineers
7,`,,
,Y,} 2522 S.Croatan Highway • Suite 2A • P.O.Drawer 1929 • Nags Head,North Carolina 27959
December 4,2000
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
Stumpy Point Water and Sewer District RO Plant
NPDES Permit No. NC0086932
HUA No.: DR0004—Permits
Dear Ms. Wilson:
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 Stumpy Point project.
1. Please find attached an Engineering Alternatives Analysis (EAA)for the above
referenced project as requested.
2. In January 1998, a test well was drilled for this project. The test well was drilled
approximately 8,000 feet from the present plant site location. Appendix D of the
Preliminary Engineering Report(PER) contained in the EAA contains maps which
illustrate the location of the test well site and the present RO plant site at the
intersection of N.C. Highway 264 and SR1100. Appendix E of the PER contains the
test well data including the driller's log and water quality analysis. Two water bearing
stratas were found in the test well. Based on a review of the parameters, the RO plant
design was based on obtaining the water source from the deeper aquifer at 260 feet.
This test well data was utilized with computerized modeling for RO plant design to
determine the concentrate parameters.
Nags Head,NC • Telephone [phone] • Fax [phone] • e-mail: [e-mail]
Southern Pines • Myrtle Beach • Raleigh • Charlotte

1 .
Susan A. Wilson
HUA No.: DR0004—Permits
December 4, 2000
Page 2
The discharge flows are based on 38,880 gallons per day from the RO concentrate and
4,320 gallons per day from the iron removal filters. There are two iron removal filters
that backwash once a day each. Each filter will backwash at a rate of 75 gallons per
minute for approximately 30 minutes for each filter. This water will be blended with
• the RO concentrate water. Water to backwash the iron filters will be treated water;
therefore,the backwash water from the filters will primarily consist of iron removed
during the treatment process.
3. As seen in the raw water quality data,the raw water quality for copper is 0.98 ppb and
0.28 ppm for zinc. These quantities are concentrated approximately 2.6 times in the
discharge concentrate stream. The projected concentrate parameters included with the
NPDES application indicate a copper concentration of 2.6 ppm. This was a
typographical error in the application and should be 2.6 ppb. This is slightly under the
North Carolina's action level water quality standards for copper which is 3 ppb. The
discharge parameter for zinc is 80 ppb which is also slightly under the maximum
allowable which is 86 ppb.
The projected pH for the concentrate discharge as listed in the NPDES permit
application is between 8.5-9.0. The raw water quality data determined pH to be 8.68.
This is slightly above the action level of 8.5.
It is pointed out that Dare County is in the process of drilling a test well on the
proposed plant site which will be used for the final production well. We have been
informed that the results for both copper and zinc are below the detection limits of 0.02
ppb and 0.02 ppm,respectively. The new pH level is 8.12 which is in the acceptable
range.
4. The water depth throughout Stumpy Point Bay is 3 feet. There is a dredge channel of
depth 7 feet for boaters from Lake Worth into the Pamlico Sound; however,this
channel is approximately 5,000 feet from the discharge location. Based on our past
experience with the Cape Hatteras RO plant,the discharge header design will not
present a problem with surface water turbulence or bottom scouring with a depth of 3
feet.

Susan A. Wilson
HUA No.: TY0001 —Permits
December 4,2000
Page 3
Permanent wells for the RO plant will be drilled on the site which may change the water
parameters slightly. The County is in the process of drilling permanent wells at this time. We
will keep you informed of any other changes in the concentrate quantity or quality.
If you have any questions or if additional information is needed,please do not hesitate to call.
Sincerely,
HOBBS,UPCHURCH&ASSOCIATES,P.A.
Eric T. Weatherly,P.E.
Division Manager
ETW/hb
Attachments
Cc: Bob Oreskovich, Director,Dare County Water Department
H:DARE COUNITDR0001 SITAPY POINT COMMUMTY WATER STREWN PFR 4ThW.C DEPARTMENT OF EVI1ROPMENf AND NATURAL RESOURCE$IWATFR
QUALIIYWPDES PERAQ71FA4UIILSONAbc

• • ENGINEERING ALTERNATIVES ANALYSIS
TO EVALUATE WASTE DISPOSAL ALTERNATIVES
Stumpy Point Water and Sewer District RO Plant
NPDES No.NC0086932
GENERAL INFORMATION
A. Basic Identification Information
► Facility Name: Stumpy Point Water and Sewer District Reverse Osmosis
Water Treatment Plant
► County: Dare
► 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:
Robert W. Oreskovich,Director
Dare County Water Department
600 Mustian Street
Kill Devil Hills,NC 27948
[phone]
► 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. Project Description
Attachment 2 of the study contains a Preliminary Engineering Report(PER)
dated September 1999 and a Preliminary Design Report (PDR) dated May
2000. The PER provides information concerning the alternatives considered
for the water system, design flows for the water system, data on the raw
water, and information regarding the discharge. The PDR contains more
detailed information on design aspects. It is not possible to consider flow
restricting or low flow devices for the water treatment facility for the
existing homes in the community.

• . "
C. Existing Facilities
Existing facilities will not be a part of this project.
D. Project Phasing
This project will not be constructed in phases.
II. 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 Manteo and is approximately 20 miles from the reverse osmosis project
site. This is not a feasible alternative for the discharge. In addition, there are no
plans for future sewage treatment facilities within a 5-mile radius within 5 years,
public or private.
B. Land Based Disposal
Land application of the reverse osmosis water treatment plant discharge is not a
feasible alternative. We have been informed by the Dare County Health Department
that of the approximately 150 tracts of land in the Stumpy Point community,only 10
lots are remaining which are permittable for an on-site sewer system. Each of the 10
remaining permittable lots is questionable as well for even a residential septic
system.
The soils in the Stumpy Point area consist of Currituck Mucky Peat, Hyde Loam,
and Psamments Soils. Currituck Mucky Peat is a marsh soil; Hyde Loam is a very
poorly drained, low permeability soil with wetness and flooding limitations.
Psamments are dredged fill material.
Land application is not a feasible alternative either for disposal of RO concentrate
due to the high levels of chloride. These high levels of chlorides 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 be in the range of 2,700 ppm
of chlorides. Typical land based plant life can withstand chloride levels up to
approximately 1,000 ppm of chlorides.
The cost of installation of a land disposal surface or subsurface system would be
very high. As an example, assuming a loading rate of 0.4 gallons/day/square foot
would require 36,000 linear feet of drain line or 15 acres of land. It is not possible to
find 15 acres of suitable soil material in a 5-mile radius of Stumpy Point.

A i P
C. Wastewater Reuse
Due to the chloride concentrations of the wastewater, wastewater reuse is not an
option.
D. Surface Water Discharge
1. The Pamlico Sound and Stumpy Point Bay do not have an associated 7Q10
or 30Q2 flow.
2. Tertiary filtration on reverse osmosis concentrate will not provide quality
improvements.
3. Attachment 3 to this report contains plans and specification of the discharge
piping for the project.
4. Land Easement Agreements
Attachment 4 contains information available to date on the land and
easements necessary to construct the discharge pipe.
5. Present Value of Cost Analysis
Attachment 5 to this report contains the present value of cost analysis for the
discharge pipe.
E. Disposal Combinations
The proposed discharge of the RO concentrate into the Pamlico Sound is the only
feasible alternative for the project.