NC0028746_Authorization to Construct_20001025

NPDES DOCUHENT SCANNING COVER SHEET
NPDES Permit:
NC0028746
Briarwood Subdivision WWTP
Document Type:
Permit Issuance
Wasteload Allocation
ter
to Construct('Authorization
:(AtC)_.
Permit Modification
Complete File - Historical
Correspondence
Speculative Limits
Instream Assessment (67b)
Environmental
Assessment (EA)
Permit
History
Document Date:
October 25, 2000
This document is printed on reuse paper - ignore any
content on the res:erse edde

Horizon Engineering & Consulting, Inc.
October 25, 2000
Mr. Michael J. Myers
NPDES Unit
NCDENR
1617 Mail Service Center
Raleigh, N.C. 27699-1617
Subject: ATC No. 028746ACC
Briarwood Subdivision WWTP
Stokes County
107 Commercial Park Drive
Concord, N.C. 28027
704-788-9497
Fax: [phone]
LJI / 11
2000-, ji
. ,iLITy
Dear Mr. Myers:
I enjoyed talking with you today regarding the Briarwood wastewater treatment plant. Based on
our conversation, I understand that you have concluded that AquaSource is not required to
receive an Authorization to Construct (ATC) to remove the former tertiary filter and tertiary filter
backwash holding tank from this facility. Hence, you will not be issuing an ATC as requested by
AquaSource.
Therefore, AquaSource will proceed with the removal of these facilities which no longer serve
any useful purpose.
We appreciate your comments and conclusion. If I have misunderstood any details and/or if
there are any matters we should discuss, please call me. Unless I hear from you prior to October
31, 2000 I will assume that my understanding of our conversation is correct and AquaSource may
proceed with removal of these facilities at any time thereafter.
If you have any questions, concerns, etc. or if I may be of any assistance, please do not hesitate to
call (704-788-9497.)
c: Glenn LaBrecque
Leonard Stogner
Gary Sherwood
Perry Smith

State of North Carolina
Department of Environment
and Natural Resources
Division of Water Quality
James B. Hunt, Jr., Governor
Bill Holman, Secretary
Kerr T. Stevens, Director
July 31, 2000
Mr. Glenn LeBreque
Aqua Source, Inc. / Rayco Utilities, Inc.
567 Interstate Boulevard
Sarasota, Florida 34240
Subject: Request for Additional Information:
ATC No. 028746ACC
Briarwood Subdivision WWTPI
Stokes County
ATC No. 067091ACA
Mikkola Downs WWTP
Forsyth County
Dear Mr. LeBreque:
4 I ri irA
NCDENR
ATC No. 028941ACA
Pine Valley Subdivision WWTP
Rowan County
ATC No. 073539ACA
Willowbrook Subdivision
Mecklenburg County
The Division of Water Quality received your requests for four Authorizations to Construct, in
February and March of this year. We have completed an initial review and request some clarification
before acting on the proposals. (These comments also apply to the Forest Ridge request, ATC No.
063720ACC, just received; we may also have comments on the other aspects of this project.)
The purpose of the proposed improvements is to "provide a more consistent, effective and reliable
means to assure adequate chlorine disinfection." The proposed projects would replace existing tablet
chlorinators at each of the facilities with liquid chlorine feed systems. It is not clear that the new
systems will actually improve disinfection performance at these facilities.
Chlorination systems must consistently deliver chlorine within certain operating bounds: the dosage
must be high enough to ensure disinfection but not so high that the residual chlorine creates toxic
conditions in the receiving stream. Chlorine demand varies with the wastewater flow, and flows vary
diurnally. Thus, the systems must be able to adjust the chlorine feed rate in order to both meet the
varying chlorine demand and stay within their operating bounds.
The proposed liquid feed systems do not appear to have flow -proportional controls. The feed pumps
are manually adjustable; however, given the especially wide flow swings typical in small plants and
the fact that the treatment plants are not staffed around the clock, manual control of chlorine dosage
is not an acceptable alternative.
Dosages in the chlorine tablet systems are reasonably flow proportional in that the rate at which the
tablets dissolve depends on the rate of wastewater flow. The existing tablet systems are performing
1617 Mail Service Center, Raleigh, North Carolina 27699-1617 Telephone [phone] FAX [phone]
An Equal Opportunity Affirmative Action Employer On the Internet at http://h2o.enr.state.nc.us/NPDES

Rayco Utilities, Inc.
Request for Additional Information
Page 2
reasonably well. Monitoring records show that, for at least the last year, most of the facilities have
maintained chlorine residuals less than 0.5 mg/L and have not exceeded permit limits for fecal
coliforms.
Please provide additional information or clarification that would better justify the change in
disinfection systems for these facilities.
Please provide your response by September 1, 2000. If you have any questions about this request,
feel free to call either of us at [phone].
Sincerely,
Michael E. Templeton
NPDES Unit
Ext. 541
Michael J. Myers
NPDES Unit
Ext. 508
cc: J. Thurman Horne, P.E. Rayco Utilities, Inc.
107 Commercial Park Drive
Concord, NC 28027
Mooresville Regional Office, Water Quality
Central Files
NPDES Unit Files

4q1'aSource
N.C. Division of Water Quality
Permits & Engineering Unit
1617 Mail Service Center
Raleigh, N. C. 27699-1617
Subject:
Gentlemen:
Application for Authorization to Construct
Proposed Effluent Chlorine Disinfection Improvements
Briarwood Subdivision Wastewater Treatment Facilities
NPDES No. NC0028746
Stokes County
March 1, 2000
Attached are plans and specifications for proposed improvements to existing chlorine disinfection
facilities. These improvements are proposed as an effort to provide a more consistent, effective and
reliable means -to assure adequate chlorine disinfection.
Whereas there is an adequate existing chlorine contact basin that is very suitable for this purpose, this
should be relatively simple and hence these plans are rather brief. This facility is presently equipped with
a tablet chlorine system. We request permission to replace this system with a simple liquid chlorine feed
system. Therefore, we propose to install a liquid feed chlorination system as shown on the attached plan.
This will be easy to accomplish by installing a small, adjustable feed rate, chemical feed pump which will
pump from a small (30 gallon) chlorine storage/make up tank into the influent of the existing chlorine
contact basin. The feed pump and storage/make up tank will be inside an enclosure to protect from
weather. The entire assembly will be mounted on a treated wood platform located adjacent to the existing
flow measurement weir box which is followed by the existing chlorine contact basin. Chlorine will be fed
into the effluent weir box at the outlet so that there will be good mixing prior to entering the chlorine
contact chamber.
This should provide a much more reliable and accurate means of insuring reliable and complete
disinfection, and should be relatively simple to install and operate.
In an effort to improve the aesthetics and to facilitate operations by clearing unneeded and derelict
equipment, we are requesting approval to remove the remains of old tertiary filters and a backwash
holding tank. These components are not a part of the approved wastewater treatment facilities. It is
unclear if these components were ever operable but, to the best of our knowledge, they have never served
any useful purpose. They are deteriorated to the point that they are of no practical salvageable value and
could not reasonably be placed into service.
Therefore, we request approval to remove these items which are essentially, inverted sections of concrete
pipe.
We are submitting this to you as a request for authorization to construct the proposed improvements.
We look forward to completing these proposed improvements and will appreciate your earliest response.
If you should have any questions or if we may be of any assistance, please call Mr. J. Thurman Horne,
P.E., Horizon Engineering & Consulting, Inc. (704-788-9497) or me (941-351-1094.)
Sincerely,
Glynn L.que
Regional ager
c:
L. -
Winston-Salem Regional Office r'
J. Thurman Home, PAFquaSource Services and Technologies,
Leonard E. Stogner
567 Interstate Boulevard • Sarasota, Florida 34240 • 941-351-1094 • 941-377-8743

Proposed Effluent Chlorination
System Modifications
Briarwood Subdivision
Wastewater Treatment Facilities
NPDES No. NC0028746
AquaSource, Inc./Rayco Utilities, Inc.
107 Commercial park Drive
Concord, N.C. 28027
Phone: [phone]
MAR 3 0 2000 .
DENR - WATER QUALITY
POINT SOURCE BRANCH
Prepared by: Horizon sneering & Consulting, Inc.
107 Commercial Park Drive
Concord, N.C. 28027
March 1, 2000

Design Chlorine Feed Rates:
Assume required 8 ppm CL2 (activated sludge treatment process effluent)
1 ppm =1 lb. CL2 per 120,000 gal.
Design feed rate — 81b. CL2 per 120,000 gal.
6.67 lb. CL2 per 100,000 gal.
Briarwood design Q = 50,000 gpd
CL2 Req'd = .50 x 6.67 = 3.34 lb./day
Option 1. Use 5% strength liquid
CL2 @ 5% Req'd = 3.34 lb./day / .05 / 8.34
= 8.01 gal/day
Option 2. Use 10% strength liquid
CL2 @ 10% Req'd = 3.34 lb./day / .10 / 8.34
4.00 gal/day
Option 3. Use 15% strength liquid
CL2 @ 15% Req'd = 3.34 lb./day / .15 / 8.34
= 2.67 gal/day
Note: If 15 % CL2 is used, proposed 30 gallon storage tank will hold supply required
for 11 days at maximum WWTP design flow (.048 MGD.)

-ic_)-J I-'elcimont Ch IorinatorSales 17045977507
P.01
STENNER FEEDER SPECIFICATIONS AND +;)U"I'PUTS
45 Series - Single 1-lead Feeders
Voltage
Product Specifications
1: OV 50/60 Hz
2::0V 50/60 Hz
2!i0V 50117
Amp Uiaw 1 70 for 120V
9 for 220V
RPM 23
HP 1 30 Fractional
Dimensions 1)" X 6" X 5 1/2'
Shipping WI 1. Ibs,
Vertical or horizonal mount avail Ible'with 1l4" cr 3/8"
accessories.
Adjustable Rate Units/Output Charts i.GPD)
ow 'ressure - 0 to 25 PSI Maximum Discharge Pressure
M )DEL
TUBE
SIZE
FEEDER SETTING:
1, 1 2 3 4 5 6 7 8
9
10
451'11
11 1
.2
.3
.6
`/
1.2
1.5
I.8
2.1 '
2.4
2.7
3.0
45t 12
11 2
.5
1.0
2.0
1.0
44,0
5.1)
6.0
7.1)
8.0
9.0
10.0
4.5113
il3
1.I
2.2
4.4
66
H.8
11.0
13.2
15.4
17.6
19.8
22.0
451 14
if 4
1 7
3.5
7.0
10.5
1 1.0
17.5
21.0
24.5
28.0
31.5
35.1)
451 15
II 5
2.5
5.0
10.0
15 0
211.0
25.0
30.0
15.0
40.0
45.0
50.0
Higl Pressure - 0 to 100 PSI Maximum Discharge Pressuic.
11 .00Ha.
45 MII'2
45 itHPI(
TU ti E
SIZE
fl 1
#2
FP.L:1)ER S1?'1"I' NC:
1, 1 2
.2 .3
.5 1.0
.6
2.0
3
.v
3.0
.1 5 G
1.2
4.0
1.5
5.0
1.8
6.0
7
M . 9 I11
2.1 2.•1 '•
2.7
7.0 I 8.0 9.0
3.0
10.0
✓ Fixed Rated Units are available. Output will / Above charts show approximate output in
be arne as number 10 setting for each model. US gallons per clay (24 hrs) at 60 hz.
When ordering, please indicate model, voltage and accessory' size.]

f D-04--CO 10:07A Peidmont ChlorinatorSales 17045977507
P.01
4
A
3
i
1
Opcii Top Flat Bottom
C)lindrical Tanks
One F loco rnoldod heavy walled tanks designed to wilhstand
rugg€ i service. Ideal for handling acids and caustics.
• Resin omplies with U.S, Food and i)rug Administration regulation 21 CFR 177.1520 (c) 3 1
and 3 2 See page 43 Ire Inure ildonnulion.
AA So►i )s - Linear Polyolhyleno (PE) - • 1 xcullan) cln:ulicn1 and ilnlx1cl11:!;1'.aunct: lot lung
depend( 116 SI'.Ivice • Upelaling lernpentluies up io 140" 1 • Open lap arms
conven5 nl mixing and lifting. • Self suppoi ing. • Twnslucenl' tot visible conleril level.
AB Seri a - Polypropylene (PP).- • Excellent chemical and stress cracking resislanco. •
(Veleta.
el or liyii iparol l o plicpt ons 1. • Sell suptwihng • Nol recommended lot cold IRmpa(a-
AK - Al I Series - Steel Stands - • I luuvy duly sktnds wilii corrosion I0519Iiiill cooling.
• final 1 Knndcd allilutors available sue page It). • Available In stainless steel.
AF Sea )s Cove is - • Ono piocc molded polyulhylonu colslnKairnl
AH Sell is - Hinged Covers - • Moldud polyethylene consInuclion. • I Iexible polypropylene
bingo w h stainless steel rivets.
FH Sark s •- Hinged Covers - • All polyethylene conslrucliun • Heavy duly Iubiiculed covers.
• Pre•o .gineered tank and mixer packages on pages 14-15.
Seo pac a shoot Ior AF, All & Fli covor pars A's.
• 1110 dui) ruI;I lronslur:t, .y vudus with wr:411., krrun l
AA AB
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7 107..211 3/16 IC102IAA IC 1021AI) IC 1021AK ICI021AM t•JIICFP.Iii
75 12xI81 3/16 IC12I0AA IC1210A0 IC121eAK IC1218AM NIIC(1'.ln
0 13x16i 3/16 IC1316AA 1C1316A0 ICI.116AK 1C1316AN1 1,111C1Pin
11) .i.x21 i 3/16 IC132IAA 1C1321)\B IC1371AK ICI321AM 111v IP.lit
12 15x161 3/16 IC1510AA ICISI6A11 IC15I6AK 1CI516AIv1 NItC:IP.Ii.
15 I5 t I91 3/16 IC 15I9AA IC 1519AB IC 1519AK TC 1519AM NIIC:FP.In
16 141211 3/16 1C1427AA 1C1427A0 1C1427AK TC1427AM NIICFP.In
16 I5x22i 3/16 IC15?2AA 1C1522A0 1CI522AK ICI522AM NIICFP,1r1
17 18x15: 3/16 1C1815AA 1CI8)5A0 IC:1815AK IC:IllthAM NII(:11'.In
25 14..40. 3/16 ICI440AA 1C1440A11 IC144OAK ICI440AM NIICIP.In
26 22 x 18 1 3/16 IC2218AA 1C2218AB IC2218AK iC2218AM '4IICIP.In
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65 22x40r 1/4 1C2240AA TC2240At) IC2240AK 1C2240AM 11IICIPin
70 24 x361 5/16 K:2436AA IC24J6AI) IC2436AK IC2436AM FIIICIP.In
73 30 <24: 5/16 1C3024AA 1C3024AB IC3024AK 1C3024ANI NIICIP.lit
85' ?II x321 5/16 IC2037AA IC7832A0 IC2832AK IC2832AM HIICIP.In
90 30 x 30 5/16 1C3030AA 1C3030A0 IC3030AK 1C3030AM 14
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105 2,1 x 54 5/16 IC2554AA IC2554A8 IC2554A< 1C2554Ah1 NC
110 30x 36 5/16 IC3036AA IC3036AB IC3036AK 1C3036AM NIIC
125 36x 30 5/16 1C3030AA 1C3630AB 1C3630AK 1C3630AM 14
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155 36x 36 5/16 1C3636AA IC3636A0 1C3636AK 1C3636AM P
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260 3.) x 53 5/16 1C3953AA IC3963A0 it:3953AK I(..11:).1AM 1'
275 42x 4E 5/16 TC4248AA 1C424BA8 IC424BAK IC424BAM NIICIP.h+
315 48 x 42 3/8 TC46A7AA 1C4642A0 IC4842AK. IC4847AM I
325 36 x 74 3/8 1C36746A IC36/4A11 1(-36746K IC36/4AM 14
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440 52 x 40 3/8 105240AA I(;5248Afl IC5248AK rC5248A1.4 NIICFP.1,
6(Y1 52xfill ;1/8 I1.":5?60AA I(:57(41\Il IC5760AK l(:6260AIv1 IC:
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575 60x 46 3/8 IC6346AA 106046AK IC6046AM NO'
5/5 42 x 96 3/8 IC4296AA • ' 1C4296AK IC479AAM N
650 48 x 84 3/8 1C48846A ' ' 1C4804AK I(-
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700 55 x 70 3/3 105570AA • • IC5570AK I:
no 72 x 46 3/8 iC7246AA ' ' IC7246AK I,
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1000 66 x 72 3/8 IC66/2AA 106612MK 1
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1350 82 x 59 7/' 6 1C8259AA ' • IC11759AK 1
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1 - 18 -• (. D OS : ? cp Pe i dmon is Ch l on natorSa l es 17045977 50'7
CHLORINE I CIa }
P-03
WATER I URIFICATION
Most i ntreated or raw water contains dissolved chem-
icals, such is hydrogen sulfide (H2S) , and living organisms,
such as Era :teria, that can be destroyed by chlorine. Usually
a part of the chlorine that is added to raw water is con-
sumed in short time on combining with dissolved chem-
icals and i t destroying the living organisms. '1'o make sure
that all tl a harmful impurities are removed front the raw
writer, sal icienc chlorine must be added to leave a slight
excess of :hlorine in the water. The excess chlorine re-
maining i . known as the CHLORINE RESIDUAL and
can be rt tdily measured by means of the ortho-tolidine
color test.
The an taunt of chlorine added, and the amount remain-
ing in th. water after treatment is measured in parts per
million ( pm). A treatment rate or dosage of 1 ppm
me.204 the addition of one pound of chlorine to one million
pounds o water which is equivalent to one pound of
chlorine t t 120,000 gallons of water.
Since different waters absorb different amounts of
chlorine, :he treatment or dosage rate of chlorine must
be varied until 2 satisfactory chlorine residual is obtained.
To inv., •iiii:. water supply, a chlorine residual
must alw &vs be present. A chlorine residual of at least
0.3 to 0. ppm, measured after the chlorine has been in
Contact ith the water for about ten minutes is generally
stifflci t :o attar^ fection. A residual of this amount
may refit ire a chlorine dosage of anywhere from 0.1 CO
Le ppm. Consult your local or state health authorities
for Mtn to recommendations. Frequent checks of the
chlorine :caidual should be made since the amount of
chlorine required to disinfect the water being treated
(chlorine demand) may vary, or the strength of the
chlorine olution being pumped may slowly deteriorate.
Note chat the graphs show the amount of hypochlorice
to use tc provide a dosage rate of 1 ppm. This must be
varied as necessary to obtain the desired residual.
Dilut chlorine solutions may be prepared from strong
stock sol ttions of sodium hypochlorice. The most readily
available stock solutions for this use arc the domestic
laundry bleaches. Calcium hypochlorice powder may also
be used.
PREPAR kTION OF HYPOCHLORITE SOLUTIONS
Suita ,le solution containers for hypochlorice are made
from po yechylene and ceramic materials.
Whe t the water used to dilute or mix sterilizing solu-
tion for .he W&T Diaphragm Pump contains what is com-
monly t rmcd "hardness", it will be necessary to observe
certain •recautions. In order to precipitate as much as
possible. ,f this "hardness" previous to the solution passing
through the Diaphragm Pump, we recommend that soda
ash or t •hat is more commonly known as washing soda,
be adde l to the sterilizing solution and all precipitate
allowed to settle. The amount of soda ash to be added
can be Irtrrmined experimentally by observing the pre-
cipitate. A z:cuss is not in any way harmful.
Certain types of hardness will precipitate without the
washing soda. Obviously the solution which passes through
the Diaphragm Pump must be clear so as rnit to interfere
with the action of the valves. In cases of el -is kind, there-
fore, a second solution container should be used and the
clear solution syphoned over to this second solution con-
tainer from which the Diaph, agni Pump wi 1 draw.
Another 111CanS of overct ming the eft c, t of hardness
is by the use of Calgon"which can be pun hased in most
drug or grocery stores. This chemical has t to property of
preventing the precipitation of carbonates i added to the
water before the addition cf the hypochlorice solution.
It is important chat the Calgt.n be in solutioa in the water
before the addition of hypoc The Calgon may be
added first to the solution container before water is added
or the Calgon may be dissolved separately aad then added
to the water in the solution container. The solution
should be stirred thoroughly to insure uni:'ormity before
the hypochlorice is added. The amount of C algon required
for the purpose is small bu' the exact qt. anticy can be
determined by whether or not. a precipitate Is formed after
adding the hypochlorice. Ir is suggested that one table-
spoonful of Calgon be used per ;10 gal. ar d the amount
increased or decreased as experience indicates.
% Solution
To make 10 gallons of a 1 % chlorine solution, use one
of the following with sufficient water to ma tc 10 gallons.
Amount
1-1 /4% Sodium hypos hloritet 7-1/ 2 Auarts
10% .. 3-2i 3 1.
1 f f, .. 2-1,'4 "
High test calcium hypschlorite
powder • s 1 11., 3 oz.
5% Solution
To make 10 gallons of a f % chlorine :elution, use one
of the following with sufficient water to make 10 gallons.
1..mows/
1-1 /4 % Sodium hypot.hloritet 10 gallons
1 Ot%, 19-1/2 quarts
It °j, •• 14 3 gallons
High test calcium hyp>clilorite
powder** 6 lbs.
To determine the quantity of solution r:quired to treat
a given flow of water, refer to the drawl 1gs on page 3.
Locate on the left-hand scale of the graph tl c flow of water
to be treated. follow the line to the right' until it inter-
sects the diagonal line indic sting the strength of solution
prepared ( line A -1 it, or line B- f %) . Dirt ctly below this
point of intersection read the gallons per day (GPD — Top
Scale) or the gallons per hour (GPH — Lower Scale) re-
quired to apply a l Bart per million (1 ppm) dose. Mul-
tiply this figure by the number of parts per million required.
The result will be the gallons per day (or g:.lions per hour)
of solution required.
'Product of Calgon Corp(); anion, Pittsbur.;h, Pa.
I Most household) liquid h1 each contains -1 %41c1. sodium
hypochlorice.
"'70% available chlorine. Stir well, allte.v sediment to
settle and syphon off c ear solution fc r use.

-1-18-00 05:23P Peidmont ChlorinatorSales 17045977507
P.04
flow to be treated — gallons per minute
flow to be treated — millions of gallons per day
60)
50 )
�)
3( 0
2(0
II0
1
I
i
1
1
1
1
II
1
1
1
/
1
1
1
I
- - -1
I
jI
10
o .s
2o
m
� �s
1 w
so qO
: is
feed rate for l ppm chlorine dosage •
10
1%
20
30
.5 l 1.5 2
so
2.5
70
gpd
gph
r�,..
gpd
3 gph
feed rate for 1 ppm chlorine dosage
•

Conc. Block Wall
r
Exist. Weir Box
A
Prop. Liquid Chlorine Feed System
Plan View - Location
Scale: 1" = 2'- 0"
,.J
_ J
T_�
To Exist. Chlorine
Contact Chamber
Proposed Liquid Feed Chlorinator
(See Detail Section A -A)
Exist. Tablet Chlorinator
(to be removed)
L
Exist. Weir Box
1
Exist. Chlorine
Contact Chamber
Former Tertiary Filter
Backwash Holding Tank Remains
(to be removed)
Farmer Tertiary Filter Remains
(to be removed'
WWTP - Plan View
Scale: NTS
Note: Ali manufacturers and models specified may be substituted with
approved equals if approved for substitution by the engineer.
Note: Provide 115 VAC, 1 phase, all weather,
4 service electrical outlet and one vapor
tight incandescent Tight fixture, Grainger
Stonco-VP-11 GC. All wiring in
conduit.
Feed tube to outlet from
Weir box (insulate or heat
tape for freeze protection)
Exist. Weir Box
Conc. Block Wall
Rubbermaid Horizontal Storage Shed
Model 3743 Lowes Item # 17941
Prop. CL2 Feed Pump
Stenner Model 45M3
urm-. Rome, P.E.
C3/ // 0
Date:
Rest Wood Support On
Exist. Wall
Prop. CL2 Storage Tank
Piedmont Chlorinator Systems
30 gal. (18 " dia. X 29 " Ht.)
1"x6"
4" X 4" Support
(or concrete block
as altemate)
Exist. Grade
Proposed Liquid Chlorine Feed System ; �
1- -I
Detail Section A - A
Scale: 1"=1'-0"
MAR 3 0 2,
DENR - WA! ttt U JALl t
Prepared by:
Horizon Engineering & Consulting, Ina
107 Commercial Park Dr.
Concord, N.C. 28027
Briarwood Subdivision WWTP
Prop. CL2 Disinfection
System Improvements
Scale: As Noted Date: 2/26100 Sht. 1 of 1