NC0028941_AUTHORIZATION to Construct_20000919

State of North Carolina �
Department of Environment
and Natural Resources
Division of Water Quality
James B. Hunt, Jr., Governor NCDENR
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:
ATC No. 028941ACA ATC No. 067091ACA ATC No. 073539ACA
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 Horne'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 chmt2e in the future. you still have the option of
submitting ATC requests for the conversion of the tablet chlorinators at any of these facilities. It, 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 Michael J. Myers
NPDES Unit NPDES Unit
Ext. 541 Ext. 508
Enclosures: ATC Submittals - 0289d1ACA.067091ACA.073539ACA
cc: Nlooresville Regional Office, Water Quality
Central Files
NPDES Unit Files
J. Thurman Horne, P.E. Horizon En_ineerina R 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

Y
State of North Carolina
fi Department of Environment
and Natural Resources
Division of Water Quality �
rlll� k -�
James B. Hunt, Jr., Governor NCDENR
Bill Holman, Secretary
ary
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 ATC-No:-02894 FAC—A/
Briarwood Subdivision WWTP Pine Valley Su6division_W_W_TP
Stokes County Rowan CountyD
ATC No. 067091 ACA ATC No. 073539ACA
Mikkola Downs WWTP Willowbrook Subdivision
Forsyth County Mecklenburg County
Dear Mr. LeBreque:
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 hitp://h2o.enr.state.nc.us/NPDES
I` _

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(919) 733-5083.
Sincerely,
Michael E. Templeton Michael J. Myers /
NPDES Unit NPDES Unit
Ext. 541 Ext. 508
cc: J. Thunman Horne,P.E. Rayco Utilities, Inc.
107 Commercial Park Drive
Concord,NC 28027
Mooresville.Regional Office, Water Quality
Central Files
NPD� ES Unif PFiI51

an o:aSource
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
Pine Valley Subdivision Wastewater Treatment Facilities
NPDES No. NCO028941
Rowan County
Gentlemen:
Attached are plans and specifications for proposed improvements to existing chlorine disinfection facilities
We have previously requested approval to replace the existing effluent chlorination system with a new,
tablet type chlorinator. We received approval and Authorization to construct these improvements by letter
from Mr. Kerr T. Stevens dated November 19, 1999. We have since determined that we would prefer to
install a liquid chlorine disinfection system,as depicted in these attached application documents. We
believe this will be a more consistent and reliable method of effluent disinfection and we are working to
upgrade our existing systems where needed to employ this technology.
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 Home,P.E.,
Horizon Engineering&Consulting,Inc.(704-788-9497)or me(941-351-1094.)
Sincerely— l�
G enn LaBrecque
Regional Manager\
c: MJsville Regional Office
J.Thurman Home, P.E. I
Leonard E. Stegner
FEB 1 8 2000 -J
AquaSource Services and Technologies, Inc.
567Interstate Boulevard • Sarasota, Florida 34240 • 941-351-1094 • 941-377-8743

Proposed Effluent Chlorination
System Modifications
Pine Valley Subdivision
Wastewater Treatment Facilities
NPDES No. NCO028941
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
ZN CA Rol
�• - SEAL l
THURMPN.
0

Design Chlorine Feed Rates:
Assume required 8 ppm CL2 (activated sludge treatment process effluent)
I ppm = 1 lb. CL2 per 120,000 gal.
Design feed rate = 8 lb. CL2 per 120,000 gal.
6.67 lb. C1.2 per 100,000 gal.
Mikkola design Q = 25,000 gpd
CL2 Req'd = .25 x 6.67 = 1.671b./day
Option 1. Use 5% strength liquid
CL2 c� 5% Req'd = 1.67 lb./day 1 .05 / 8.34
= 4.00 gal/day
Option 2. Use 10% strength liquid
CL2 @ 10% Req'd = 1.67 lb./day / .10 / 8.34
2.00 gal/day
Option 3. Use 1 5% strength liquid
CL2 @ 15% Req'd = 1.67 lb./day! .15 / 8.34
1.33 gal/day
Note: If 15 % CL2 is used, proposed 30 gallon storage tank will hold supply required
for 22.5 days at maximum W W"I'I' design flow (.025 MGD.)

1- 3u-u � reiamcinL Ch 10T"Ina.'CoY' 'ales 1704597J 507 P . OI.
STMTN[SR FEEDER SPf:CIFICM IONS AND OU IT'1'S
45 Series - Single Head Feeders
Product Specilicalions
Voltage 1:OV 50/60 Hz
2::OV 50/60 Hz
2';OV 60 1iz
Amp Draw
1 70 for 120V
0 for 220V
RPM 23
lip 1 30 Fractional
r., ' •'+ Dimunsiuns 1 )'• X 61• X 5 112'
- . . Shipping WI - I. Ills
Vertical or horizonal mount avail able with 1/4"(r 318"
accessories.
Adjustable Rate tJnitslOutpl.lt Charts i.GPD)
Low 'ressme -0 to 25 PSI Maxinumr Discharge Pnasswc
Ni XWLw
E'I"IINC
SIZEI 2 3 4 5 G 7 8 _Y 111
•15t II .3������6 � �� 7 1.2 LS I.8 2.1 2.4 2.73l149 12 Lll 2 0 !9 •LII 5,o L.II TO 8.0 )0 10.0
45113 .2 IA 66 8.8 II.0 13.2 t5..I !T6 1'1.8 22.0
45t 1.1 .5 7.0 10.5 11.11 17.5 21,0 24.5 28.0 11.5 35.0
451 15 N 5 2.5 5,0 10.0 15.0 2u.0 25_u 30.0 15.0 411.0 •15.0 50.0
Hill Pressure - o to 10o PSI Maximum Uischarge rhesso-
[455
T(lnli FEEDER SLT'I'INC:
SIZE 1. 1 2 3 �r 5 �AIIP2 11 - I.S 1.8 '2.1 4 2.7 l,ll AHP10 H 2 .5 IA 2.71 3.o 4.0 5.0 G.(1 7.0 8.0 9.0 10.0
✓ Fixed Rated Units are available. Output will ✓ Above charts show approxinlnle 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.

I :)-04-CO 10 : 07A Peidmont Chlorinatot-Sa _les 170459775017 P - 01
Open Top Flat Bottom
C} lind.rical rlaldis
1 One I ieco molded heavy walled lanks designed to wilhslanci
Fugge J service. Ideal for handling acids and caustics.
•IResin nnlplios wi01 tM;, Faoa and Ilion AdlniniShrawn Nyluluh9n 21 CFR 177.1520(r.) 3 1
Dn0 3 2 .^,oil poiju 4:3 fill 111010 inlaanuli'al .
AA Sur s L-1 AI•Piulyolhyy lm54(1 IJ • I i, alb 11 rb,uucal nnl ilupu,I I auuc.•
depuu 01 1veA' •.:.r":allot)Innip u1Wa's up lu I4D'1 •(Ipan lap ullaw
cc vuno nl nuxall rind Idling •Sell,uppul l it • II(If ISIli6C111' 101 vulhle CI dull toilet.
AB Seri is-Polypropylene(PP -•Excellent chemical(fit(]Mess cmckinc resOancu.
Opefulu I lemparalure up.to 212' • Sell suppo)hng. • Not leconunen(fif lei cold IerupP.la-
Imes or llgh nnpad applications.
AK-At I Series-Steel Stands-• I leuvy duly slan(L Will coa)slfnl leslsll la CO(Iling.
• Floor I wudad agilulnls avoilahio sco pogo Ib. •Available In sluinless sli el.
AF Sell IS-Covers-•Ona pR;cr.nullded pulyalhylcnu euu:;hualion . .: .�. 7 r' i.
All Sort is- Hinged Covers- • hlaldml IK)IYCIIIYICIIa I:aW0111CIM(l. • I ID.II)IO palypinpYluaa ; ,: •'` . 'i.
hinge If 11 slainloss steel rivals. f
FH Sef:: s HL u'vors •All poiyelhylene consifudion. • Heavy duty fohliculal covers.
• Pre-9 gineered tank and mixer packages on pages 14-15,
See pdc f sheel for AF Ali IS FM cover pad s's. as\/AB I AF
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-1- 18-03 05 : 22P Peidmont Chlorinator-Sales 17045977507 P _ 03
CHLORINE IC61
WATER I URIFICATION
Most h nitrated or raw water contains dissolved Chem- the Diaphragm Pump must be deaf so as Met to interfere
itals, such as hydrogen sulfide (H:S), and living organisms, with the Action of the valves. In oscs of if is kind, there-
such as ba Ecru, that can be destroyed by chlorine. Usually fore, a second solution container should be used acid the
A part of the chlorine that is added to taw water is con- clear solution syphoned over to this second solution con-
sumed I., . ,Imrt time tot combining with dissolved Chem- uiner from which the Diaph,agm pump wi 1 draw.
ieals and i t destroying the living organisms. To ruake sure Another means of overes mutg the cite, t of hardness
that all El c harmful impurities are removed front dtc raw is by the use of Calgon' which tin be put,hascd in must
water, sus icient chlorine mint be added to (cave a slight drug or grocery stores. This chemical has t to prttperey of
excess of :hlorine in the water. The excess chlorine rc- preventing the precipitation of carbonates i- added to the
maiming is known As the CHLORINE RESIDUAL and water before the addition tf the hypochlarite solution.
can be rt cdily measured by means of the ortho-tolidine It is important that the Calgon be in solutio.i in the water
color tew before the addition of hypoc tlorite. The Cilgon may be
The m count of chlorine added, and the amount remain- added first to the solution container before water is added
ing in th, water after treatment is measured in pats per or the Calgon may be dissolved separately lad then added
million ( ,pm). A treatment race or dosage of I ppm to the water in die solurnIn container. The solution
means [he addition of one pound of chlorine to one million should be stirred thoroughly to insure uni:brmity before
pounds o water which is equivalent to one pound of the hypochlorite is added. Tire amount of C algon required
chlorine t ) 120,000 gallons of water. for the put" is small buy he exact qt an ay can be
Since different wafers absorb different amounts of determined by whether or no,. a precipitate Is formed after
chlorine, :he treatment or dosage rate of chlorine must adding the hypochloritn. It is. suggested that one table-
be varied until a satisfactory chlorine residual is obtained. spoonful of Calgon be used per 10 gal. at d the amount
To insure a disinfected water supply, a chlorine residual increased or decreased as exp:nence indicates.
muse Alw tys be present. A chlorine residual of at least I% Solution
OJ to 0. ppm, measured after rise chlorine his been in To sake 10 gallons of a I'/r, chlorine solution, use one
contact t ith the water for about [en minutes is generally of the following with suQicicut water to mate 10 gallons.
Sufficient :o insure disinfection. A residual of this amount Amount
may regt ire a chlorine dosage of anywhere from O.f to 5-1/iri'r. Sodium hypo,blorittt 7-1at 2 quarts
f.o ppm. vour local or stare health authoritio 107. 3-2, s
for dollar a iecommcndations. Frequent checks of the I f'%, 1. 2 1 •4
Chlorine '"ideal should be made since the Amount of High test calcium hyp)chlorite
chlorine required to disinfect the water being treated powder" I II., J CIA.
(chlorine demand) may vary, or the strength of [he 5% Solution
chlorine olution being pumped may slowly deteriorate. To make 10 gallons of a fr%u chlorine sclotion, use one
Not. that the graphs show the amount of hypochlorite of the following with suffieie it water to make 10 gallons.
to use tc prnvide a dosage rate of 1 ppm. This must be al.tnstnt
varied as necessary an obtain the desired residual. f-1/fir/• Sodium hypochloritet 10 gallons
Dilur chlorine solutions may be prepared from strong III%, 19-1 /2 quarts
stock Sol Lions of sodium hypochloritx. The most readily 1 f r�1, I gallons
available stock solutions for Ellis use arc the domestic High cmc calcium hyp)ehlorite
laundry Icaches. Calcium hypochlorite powder may also powder" 6 lbs.
be used. To determine the quantity of solution r:quired to treat
a given flow of water, refer: to the dnwisgs on page J.
PREPAR UION OF HYPOCHLORITE SOLUTIONS Lneare no the left-band sole of the graph d c flow of water
Suits de solution containers for Isyprschlorite are nude to be tmascsl. Follow the line to the righ, :until it incer-
from par yechylene and ceramic materials. sects the diagotul ii ne indicating the strength of solution
Who , the water used to dilute or mix sterilizing solu- prepared (line A-1'/b or line B-f%,). Directly below this
point of intersection read the gallons per da)' (cPD—Top
[ion for .he W&T Diaphragm Pump contains what is cum-
munly [ tried "hardness", it will he necessary to observe Scared or 1p gallons per hour (GPH — Lower Scale) ul-
certain rocautions. In order to precipitate As much as gmreJ is appre a I part per millionop (1 ppm) dose. Med.
possible ,f this "hardness" previous to the solution passing reply this figure by the nwnb:r per
parts per million required.
through the Diaphragm Pump, we recommend that soda The result will be the gallom per day (or g:.11ons per hour)
ash or t of solution required.hat is more commonly known as washing soda, _-_,__._ ,__.____—be aide I to the sterilizing solution and all precipitate
Allowed to sctslC. -Fire amount of soda ash to be added 'Vu ocr of Cal);nn (Orpui anon, Pitishur.;h, P:h,
Can Ise Ietermined experimentally by observing the pre- (Most houschol.l liquid bench rastuaius '• I-ds'i ss.liunc
eipieate. A slight excess is not in any way harmful. hyptscblon,e.
Certain types of hardness will precipitate without the 00701,'i• available chlunnc. Stir well, allow sediment CO
washing soda. Obviously the solution which passes through sertic and syphon off c ear solution'fr r use.

n- 18-00 05 : 23P Peidmont Chlorinator5ales 17045977547 P . 04
60)
I
50
E
a 4f
N O --
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e �o
m o
� b
21 0
o
I I 0 --
.
Q 10 20 30 40 50 1 — gpd
IO .5 1 1.5 2 2.5 3 gph
feed rate for I ppm chlorine dotage .
4 —
-ce
a 3
c
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T
u
0
,I 2
o
m
x I
I 510
o
I
I%
0 10 20 30 40 50 60 70 gpd
.5 I 1.5 2 2.5 3 gph
food rate for I ppm chlorine dosage

Ftoeosed Liquid Feed Chlorinator
(Sae Detail Secion F,8)
Rubbermaid Horizontal Storage Shed
B B Note: Provide 115 VAC, 1 phase, all weather, Model 3748 Lowes Item # 17941
4 ser ice electrical outlet and one vapor
Exist. V-notch weir tight incandescent light fixture, Grainger .
- --- — Stonco-VP-11 GC. All wiring in
conduit.
(Exist. CL2 basin) i
� I
c
Exist. Tablet Chlorinator
To be removed Prop. CL2 Feed Pump pro CL2 Storage Tank
(Exist. Clarifier) Stenner Model 45M3 p g
Piedmont Chlorinator Systems
Exist. a kway Feed tube to Exist. i 30 gal. (18 " dia. X 29 " Ht.)
ii CL2 basin (insulate
or heat tape for
freeze protection)IL-
Exist. Chlorine Contact Chamber
I Scale: 1" = 30'
1111 i Treated Lumber 2" x g•
i
i
Exist. Grade
F
i
wc. wc. I i I
�I l Proposed Liquid Chlorine Feed System I
Anchor support posts with cone. C _!. Detail Section B-8
Min. 2 ' below grade )
—�--� Scale: 1.. = t t_O., - - —
' S•H Ch::
Exist. Chlorine Contact Chamber Prepared by:
S Section A-A 7• Horizon Engineering& Consulting, If7a
� hurevta ��
l _ _ ,'+t�f[t5i60dS55�'`` 107 Commercial Park Dr.
' Scale: NTS Concord, NC 28027
i
Pine Valley Subdivision VVWTP
- J. Oman Hom P.E. Prop. CL2 Disinfection
/ System Improvements
Note:AU manufacturers and models specified may be substituted with 6 C7
approved equals if approved for substitution by the engineer. Date Scale:As Noted Date: 2lO5100 Sht. 1 of 1

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