NC0073539_Return_20000919

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
September 19, 2000
Mr. Glenn LeBreque
Aqua Source, Inc. / Rayco Utilities, Inc.
567 Interstate Boulevard
Sarasota, Florida 34240
Subject: ATC Returns
e_�n
NCDENR
ATC No. O28941ACA ATC No. 067091ACA ATC No. O73539ACA
Pine Valley Subdivision WWTP Mikkola Downs WWTP Willowbrook Subdivision
Rowan County Forsyth County Mecklenburg County
Return No. 2090 Return No. 2091 Return No. 2092
Dear Mr. LeBreque:
The Division of Water Quality received Mr. J. Thurman Home's August 28 letter, written on your
behalf. In his letter. Mr. Horne withdrew Rayco's request to convert five of its plants from tablet
chlorination to liquid -feed chlorination. The Division hereby acknowledges withdrawal of those five
Authorization to Construct (ATC) requests. As a result, we are returning the packages for the three
plants listed above. The two remaining ATC requests (Briarwood and Forest Ridge Subdivisions)
include other improvements. as Mr. Horne noted, and we will continue our review of those projects,
minus the disinfection portions.
If your wastewater treatment needs should change in the future, you still have the option of
submitting ATC requests for the conversion of the tablet chlorinators at any of these facilities. In that
case, we would expect the new proposals to address questions raised in the current reviews.
If you have any questions about the returns, feel free to call either of us at [phone]. You
should contact Mike Myers if you have questions about the Briarwood or Forest Ridge Subdivision
projects.
Sincerely,
Michael E. Temp eton
NPDES Unit
Ext. 541
Michael J. Myers
NPDES Unit
Ext. 508
Enclosures: ATC Submittals - 028941ACA, 067091ACA, 073539ACA
cc: Mooresville Regional Office, Water Quality
Central Files
NPDES Unit Files
J. Thurman Horne, P.E. Horizon Eneineering & Consulting, Inc.
107 Commercial Park Drive
Concord, NC 28027
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

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 WWTP
Stokes County
ATC No. 067091ACA
Mikkola Downs WWTP
Forsyth County
Dear Mr. LeBreque:
NCDENR
ATC No. 028941ACA
Pine Valley Subdivision WWTP
Rowan County
ATC No. 073539ACA
Willowbrook SubdivisioA
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 Michael J. Myers
NPDES Unit NPDES Unit
Ext. 541 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 I

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ATC PROCESSING
PROCESSING ASSISTANT
CHECK LIST
SCOPE of Project:
Facility: I[ �l('ion wt f P
NPDES No.: NGOUTi�iS�R
ATC No.: 01735-,39114CA
ti Pull existing permit, (is this action allowed?): *25
Will this activity require a change notice to compliance?
✓ Point Assignment: /()
Letter of Request from the Permittee
"(3) Plans, Specifications and Design Calculations
* signed & sealed by NC PE ?
* three sets of each?
ACTION:
rejection (reason):
_ hold for
✓ accept (date):
LOG IN & DISPERSAL (Once package is complete):
Log on the Units' ATC data base
YES NO
✓ Log on NVCC / determine the ATC number/ create and print out tracking slip
`Create and send acknowledge letter (da alent)!
* to permittee
* to consultant ijX3100
* to NPDES file :imaor:
Request Staff Report from Regional Office sent on: x)
(assemble the following and mail by courier to the appropriate�RO):
copy of the acknowledgment letter (highlight RO),
copy of the request letter,
copy of submittal package (plans, specs and calculations),
ASSIGNED: j�
/ reviewer: I n IL7)'1 date: 9400
update tracking:
ATC process 8127198

To: Permits and Engineering Unit
Water Quality Section
ATTN: Christie Jackson
Date: April 10,2000
AUTHORIZATION TO CONSTRUCT
NPDES PERMIT
STAFF REPORT AND RECOMMENDATIONS
County: Mecklenburg
Permit No. ATC073539ACA
MRO No.: 00-45
PART I - GENERAL INFORMATION
I II
APR 1 3 2000 U
DENR - WATER QUALITY
POINT SOURCE BRANCH
1. Facility and Address: Willowbrook Subdivision WWTP
AquaSource, Inc./Rayco Utilities, Inc.
107 Commercial Park Drive
Concord, North Carolina 28027
2. Date of On -Site Investigation (if conducted): N/A
3. Report Prepared By: Samar Bou-Ghazale, Env. Engineer I
4. Persons Contacted and Telephone Number: Mr. Thurman Horne,
P.E., Consultant, tel# [phone].
5. Directions to Site: From the intersection of NC Hwy 73 and
NC Hwy 115 in northern Mecklenburg County, travel east on NC
Hwy 73 approximately 1.4 miles. Turn right onto Willow
Breeze Lane and travel south approximately 0.45 mile. Turn
right onto Ramah Creek Court. The WWTP is located
approximately 300 feet southeast from the Ramah Creek Court
cul de sac.
6. Verified Discharge Point(s), List for All Discharge Points:
Latitude: 35026'38"
Longitude: 80049'09"
USGS Quad No.: F15NE USGS Quad Name: Cornelius, NC
7. Site size and expansion are consistent with application?
Yes X No If No, Explain: N/A
8. Topography (relationship to flood plain included): The WWTP
is within 50 feet of Ramah Creek, but appears to be located
at sufficient elevation for protection from a 100 year
flood.
9. Location of Nearest Dwelling: The nearest residence is
within 400 feet from the WWTP.

PART II - DESCRIPTION OF DISCHARGE AND TREATMENT WORKS
1. Existing Treatment Facilities: The existing WWT facility is
an extended aeration package plant consisting of a bar
screen, aeration tank, clarifier, chlorine contact tank with
tablet type chlorination, aerated sludge holding tank, and
continuous flow measurement.
2. Proposed Treatment Facilities: The proposed improvements
consist of replacing the tablet chlorination with a liquid
chlorine feed system.
3. Sludge Handling and Disposal Scheme:
Residuals are pumped out by Piedmont Septic Tank (Randy
Milton [phone]) and transported to either Concord's
Rocky River WWTP or Salisbury's Town Creek WWTP for
disposal.
4. Treatment Plant Classification: Class II
5. SIC Code(s): 4952
Wastewater Code(s): 05
Main Treatment Unit Code: 06017
6. Other Special Items: N/A
PART III - EVALUATION AND RECOMMENDATIONS
The permittee, has applied for an Authorization to Construct
for the addition of a liquid chlorine feed system at the
Willowbrook Subdivision WWTP to replace the tablet type
chlorination system. This should provide a more reliable and
accurate means of disinfection.
Pending final review and concurrence by P&E, it is
recommended that the authorization to construct be issued.
ture of Rep6r Preparer
Water Qualit4( Regional Supervisor
m/ v a

.A.-n-lia Source
February 7, 2000
N.C. Division of Water Quality
Permits & Engineering Unit
P.O. Box 29535
512 N. Salisbury St.
Raleigh, N.C. 27626-0534
Subject: Application for Authorization to Construct
Proposed Effluent Chlorine Disinfection Improvements
Willowbrook Subdivision Wastewater Treatment Facilities
NPDES No. NC0073539
Mecklenburg County
Gentlemen:
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 chlorine contact basin.
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.
We are submitting this to you as a request for authorization to construct.
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,
G enn L re que
Regional a ager
CS"
FFF -
- '8
c: Mooresville Regional Office �00D
J. Thurman Home, P.E.
Leonard E.Stogner
AquaSource Services and Technologies, Inc.
567 Interstate Boulevard • Sarasota, Florida 34240 • 941-351-1094 • 941-377-8743

Proposed Effluent Chlorination
System Modifications
Willowbrook Subdivision
Wastewater Treatment Facilities
NPDES No. NCO073539 '
AquaSource, Inc./Rayco Utilities, Inc.
107 Commercial park Drive
Concord, N.C. 28027
Phone: [phone]
Prepared by: Horizon Engineering & Consulting, Inc.
107 Commercial Park Drive
Concord, N.C. 28027
February 4, 2000
� 04/6 FFe • ,,
ZA

Desi n Chlorine Teed Rates:
Assume required 8 ppm CL2 (activated sludge treatment process effluent)
1 ppm = 1 lb. CL2 per 120,000 gal.
Design feed rate = 8 lb. CL2 per 120,000 gal.
= 6.67 lb. CL2 per 1001,000 gal.
Mikkola design Q = 48:0000 gpd n^�
CL2 Req'd = .48 x 6.67 — 3.201b./day
Option 1. Use 5% strength liquid
CL2 @ 5% Req'd — 3.20 lb./day 1.05 / 8.34 `
= 7.68 gal/day
Option 2. Use 10% strength liquid
CL2 @ 10% Req'd = 3.20 lb./day / .10 / 8.34
-- 3.84 gal/day
Option 3. Use 15% strength liquid
CL2 rr 15% Req'd = 3.20 lb./day / .15 / 8.34
2.56 gal/day
Note: If 15 % CL2 is used, proposed 30 gallon storage tank will hold supply required
for 12 days at maximum WWTP design flow (.048 MGD.) '
as _

05:22P Peidmont ChlorinatorSales 17045977507 P_Ol
STENNER FEEDER SPECIFICATIONS AND OUTPUTS
45 Series - Single Head Feeders
Product Specifications
Vultage 1, OV 50/60 Hz
2::OV 50/60 Hz
2!,OV 50 I Iz
Amp Draw
170 for 120V
9 for 220V
RPM
23
lip
1 30 Fraclionat
Oimensiuns
1 )'• X 6" X 5 1/2'
Shipping WI
1Has.
Vertical or horizonal mount
avail eble'vilh 1/4" (r 3/8"
accessories.
Adjustable Rate units/Output Charts i.GPD)
,.... n.--ro _ n In 95 PSI Maximum Discharne ('ressulc
M MEL
TUBE
SIZE
FEEDER SE"ITINC:
1. 1 2 3 4 5 6 7 8 9 IU
45t Il
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n RN)E7• TUIi E. BF'LI)E t SETTING:
SIZE 1. 1 2 Ja 5 rr 7 H '/ 111
45 AIIP2 ll I �5=2
1.2 I.5 Lx 2.1 2A L.7 3.r145 AHPIII H 2 l 4 11 S.0 G.0 1.0 8.0 ').11 IU.O
✓ 1 is od r<aieu' '.:,its are available. Output will ✓ Above chaps show approximate output in
be .ame as number 10 selling for each model. us gallons per day (24 hrs) at 60 hz.
When ordering, please indicate model• voltage and accessor• size.

�h•o_04-CO 10:07A Peidmon't ChlorinatorSales_170459775OF P.01
'o Flat Bottom Top)
`ranks
One I ioce rnolded heavy walled tanks designed to withstand
ruggr :l sec,,^c: kiool for handling acids and caustics.
• Resin empties with U.5. rood and Dag Administration regulation 21 CFR 177.1520 (c) 31
and 3 2 Soo pogo 43 tut more inlnnnuliun.
AA Son Is - Unenl Polyolhyyleno (PE) - • 1 Xcetlmd chelllicul and ingxlcl leslskwce lul luau
depend( Ito service. • Openling lempendums up In 140" 1 •Open lop allows
convenil nl mixing and filling. • Self SUPpoding. • TmaSIIICCIIP lot vislblo Conlon IOVat.
AB Seri Is - Polypropylene (PP) - • Excellent chemical raid skess crackinreslslanco.
Operu!n I tompangure uplo 212 F. • Sell suplxnling • Not lecunen indudla( cold lemperu-
Imes or sigh imlxid applications.
AR - Al I Series - Steel Stands - • I feuvy dilly stands w1111 corrosion ao slsluld coaling.
• I'Innl I mined agilelu(s evailoblo sou page 16. • Available In stainless steel.
AF Seri Is - Covers - • One piaec molded polyelhylona CansIftielion
All Seri 1s -Hinged Covers - • Muldud potyo111ylone cunshucbon. • (Ioxible pot)yrtopylelle
binge w h slainless steel rivals.
FH Sed( s -Hinged Covers - • All polyemylene constlachun • I Ieavy duly labliculad covers.
• Pre-o .gineered tank and mixer packages on pages 14-15.
See plat 1 shoot rot AF, Arl IN Fit covol pan 0's.
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1-18--0:j 05:22P Peidmon't C:lilorinatorSales 170459775017
CHLORINE (Cla)
P.03
WATER I URIFICATION
Most t entreated or raw water contains dissolved chem-
icals, such as hydrogen sulfide (HzS), and living organisms,
such as ba :tcria, that can be destroyed by chlorine. Usually
a part of the chlorine that is added to raw water is con-
sumed in . shArc time on combining with dissolved chcm-
icals and i t destroying the living organisms. To make sure
that all tl a harmful impurities are removed from the raw
water, sui icient 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 re idily measured by means of the ortho-tolidine
color test.
The 23 zottttt of chlorine added, and the -amount remain-
ing in th. water after treatment is measured in parts per
million ( tpm) . A treatment race or dosage of 1 ppm
means the addition of one pound of chlorine to one million
pounds o watet• which is equivalent to one pound of
chlorine t ) 120,000 gallons of water.
Since different waters absorb dilfcrcttt amounts of
chlorine. :he f.:r"►+.K!a�i�i or dosage rate of chlorine must
be vatied until a satisfactory chlorine residual is obtained.
To inse-, = water supply, a chlorine residual
must alw tys be present. A chlorine residual of at least
0.) to 0. ppm, measured after the chlorine has been in
contact t ith the water for about ten minutes is generally
sufficient :o insure disinfection. A residual of this amount
may refit ire a chlorine dosage of anywhere from 0.5 to
5.0 plum. Consult your local or state health authorities
for defin cc recommendations. Frequent checks of the
chlorine residual should be made since the amount of
chlorin: required to disinfect the water being treated
(chlorine dernand) may vary, or the strength of the
chlorine olution being pumped may slowly deteriorate.
Note that the graphs show the amount of hypochlorite
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 itions of sodium hypochlorite. The most readily
available stock solutions for this use are the domestic
laundry leaches. Calcium hypochlorite powder may also
be used.
PREPAR kTION OF HYPOCHLORITE SOLUTIONS
Suita At solution containers for hypochlorite are made
from po yethylene and ceramic materials.
Whe t the water used to dilute or mix sterilizing solu-
tirm for .lie W&T Diaphragm Pump contains what is cum-
monly t rmcd "hardness", it will be necessary to observe
certain -rccautiors. 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 , -hat is more commonly known as washing soda,
be adde I to the sterilizing solution and all precipitate
allowed ::> >st: • -:: amount of soda ash to be added
can be letermined experimentally by observing the pre-
cipicat=. A :xcrss is not in any way harinful.
Certain types of hardness will precipitate without the
washing soda. Obviously the solution which passes through
the Diaphragm Pump must be clear so as n.tt to interfere
with the action of the valves. In cases of this 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 Diaphi agm Pump wi I draw.
Another ttuans of overct ming the efTe, t of hardness
is by the use of Calgon`' which can be purt hascd in most
drug or grocery stores. This chemical has t is property of
preventing the precipitation id carbonates i ' added to the
water before the addition c f the: hypochlorite solution.
It is important that the Calgt.n be in solution in the water
before the addition of hypos ilorite. The Calgon may be
added first to the solution co itainer before water is added
or the Calgon may be dissolved separately and then added
to the water in the solution container. The solution
should be stirred thoroughly to insure uni:'ormity before
the hypochlorite is added. The amount of Calgon required
for the purpose is small bu, the rxaec qt. atttity can be
determined by whether or no. a precipitate is formed after
Adding the hypochlorite. It is suggested that one table-
spoonful of Calgon be used per 110gal. and the amount
increased or decreased as expo:rtence indicates.
I % Solution
To make 10 gallons of a It/, chlorine solution, use one
of the following with sufficient water to ma tc 10 gallons.
A Mount
f-1/4%a Sodium hypos hloritef 7-1,,2 Auarts
10t70 s. 3-213
15%, 64 6 2-1,' 'i
-
High test calcium hyp )chlorite
powder" ; 1 11., 3 oz.
5% Solution
To make 10 gallons of a S % chlorine sc lution, use one
of the following with sufficie it water to make 10 gallons.
J.nwunt
f -1 /4 . Sodium hypothlorite j' 10 gallons
to%' a of 19-1 %2 quarts
150 3 gallons
High test calcium hyp, )chlorite
powder* * 6 lbs.
To determine the quantity of solution required to treat
a given flow of water, refer- to the drawi igs on page 3.
I.oc.tte ,►u 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 indicating the strength of solution
prepared ( line A-1 jo or line B-f %) . Directly below this
point of intersection read the gallons per day (GPD — Top
Scale) or the gallons per hoar (GPH -- 1.3wer Seale) re-
quired to apply a I part per million (1 ppin) dose. Mul-
tiply this figure by the numb:r of parts per million required.
The result will be the gallon: per day (or S-Alons per hour)
of solution required.
Producr of Calgon Ctulmi aritm, Pittsbur ;h, Pa.
Most htutschola litluid hl :at:h contains '•• 1 : al "I'. so-liunt
hypochlorite.
010701;;� available chlorine. Stir well, allow sediment to
settle and syphon off c ear solution fe: r use.

-I-18-CO 05:23P Peidmont Cl-alov-inatov-Sales 17045977507 P.04
60 ,
50:
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60 so I I
food rate for ppm chlorine dosage
g pd
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60 70 1 gpd
1
2.5 3 gph
food rate for 1 ppm chlorine dosage

Exist. Chlorine Contact Chamber
Proposed Liquid Feed Chlorinator
ee Detail Section B-a)
Note: Provide 115 VAC, 1 phase, all weather,
4 service electrical outlet and one vapor
tight incandescent light fixture, Grainger,
-- Stonco-VP-11 GC. All wiring in
conduit.
Feed tube to Exist.
CL2 basin (insulate
or heat tape for
freeze protection)
Scale: V = 30' 3-71
WL
Exist. Chlorine Contact Chamber
ti
Section A -A
Scale: 9" = 30'
Note: AU manufacturers and models specified may be substituted with
approved equals if approved for substitution by the engineer.
Rubbermaid Horizontal Storage Shed
Model 3743 Lowes Item 9 17941 —
Prop. CL2 Feed Pump
Stenner Model 451VI3
Exist. Tablet Chlorinator
To be removed j
4"x4'.1..� C
i
tl �
Anchor4 support posts with can _� {
Min. 2 'below grade ----�
Treated Lumber
Prop. CL2 Storage Tank
Piedmont Chlorinator Systems
30 gal. (1 S • dia. X 29 " Ht.)
2" x 6"
inX6"
Exist. Grade
Pro osed Liquid Chlorine Feed System
Detail Section B-B
1 l
Scale: V = V- 0"
'unman H me, P.E.
o a
Qate
1 r
! FEB .
� � 8 2000
Prepare y --' ?CE kricH
Horizon Engrneenng ' , Inc.
107 Commercial Fark Dr.
Concord. N. C. 26027
Willowbrook Subdivision WWTP
Prop, CL2 Disinfection
System Improvements
Scale: As Noted Date: 2104/00 Sht. 1 of i