NC0021326_AUTHORIZATION TO CONSTRUCT_19941221

M
NPDES DOCUMEM1` SCAMMINC COVER :iMEET
NPDES Permit: NC0021326
Dobson WWTP
Document Type: Permit Issuance
Wasteload Allocation
'Authorization to Construct
(AtC)
Permit Modification
Engineering Alternatives Analysis
201 Facilities Plan
Instream Assessment (6713)
Correspondence re: Mercury
Permit
History
Document Date: December 21, 1994
This document is printed on reuse paper- ignore any
content on the reverse side

J
State of North Carolina
epartment of Environment,
ealth and Natural ResourcesA4 '6
Division of Environmental Management r
James B. Hunt, Jr., Governor
Jonathan B. Howes, Secretary ID FE i N F4
A. Preston Howard, Jr., P.E., Director
December21, 1994
J. Wayne Atkins, Town Manager
To%k n of Dobson
P.O. Box 351
Dobson, NC 27017
Subject: Permit No. NCO021326
Authorization to Construct
Town of Dobson
Wastewater Treatment Plan
Surry County
Dear N4i. Atkins:
A letter of request for an Authorization to Construct was received March 3l, 1994 by the Division
and final plans and specifications for the subject project have been reviewed and found to be satisfactory.
Authorization is hereby granted for the 0.2 MGD, 55 foot diameter circular treatment unit consisting of 25
foot diameter clarifier with 13.5 foot sidewall water depth and a 407 gpd/ft2 surface loading rate; 152,000
gallon aeration zone with coarse bubble diffusers, 38,000 gallon anoxic zone with mixer; refurbishment
of the existing 0.15 MGD, 55 foot diameter circular treatment unit consisting of a 28 foot diameter clarifier
with t 1.0 foot sideviall water depth and 244 gpd/ft2 surface loading rate; 116,000 gallon aeration zone
with coarse bubble diffuser, 29,000.gallon anoxic zone with mixer; two 100,000 gallon sludge holding
tanks with mixers; lime storage and feed unit; blower platform with 3 rotary positive displacement
blowers rated at 600 SCFM; sludge transfer and loading pumping station with two 400 gpm pumps at 12
ft rated head capable of handling 2-40/c solids, lime stabilized sludge and 3 inch drain line directed to
influent wet well; waste sludge loading station with 3 inch drain line directed to influent wet well; 6 foot
diameter decant manhole with 4 inch decant line to influent wet well; addition of new auger screen
mechanism for preliminary treatment, three new centrifugal influent pumps of 230 gpm, 460 gpm, and
460 gpm at 25 ft rated head; flow splitter box for appropriate flow distribution to the 0.15 MGD unit and
0.2 MGD unit; scum pumping station with mixer and a single 80 gpm centrifugal pump at 25 ft. rated
head from aeration/clarifier units to WAS line; sludge box with mixer for lime feed and distribution to
sludge storage tanks; RAS/WAS pumping station with two 250 gpm at 17 ft. rated head centrifugal RAS
pumps and one 80 gpm at 25 ft. rated head centrifugal WAS pump; refurbish existing RAS/WAS wet well
including the addition of sludge line from aciation/clarifier unit; ultraviolet disinfection unit and all the
associated valves, piping, and appurtenances with discharge of treated wastewater to Cody Creek in the
Yadkin River Basin.
The following items shall be resolved and a statement of resolution shall be submitted by the
sign engineer upon certification of completion:
The influent line to the existing sludge drying beds must be plugged as indicated on the plans. Any
existing residuals on the drying beds shall be appropriately disposed of. The drying beds may not
be used for the storage or disposal of residuals after completion of the treatment plant expansion.
P.O. Box 29535, Raleigh, North Carolina 27626-0535 Telephone [phone] FAX [phone] i9

Permit No. NC00' 1326
Authorization to Construct
wown of Dobson
astewater Treatment Plain _
Page 2 _
No drain line shall be built in the RASAVAS pumping station.
The existing by-pass of the disinfection unit shall be plugged as indicated on the plans.
The existing by-pass between the preliminary treatment and influent wet well shall be plugged.
In addition. the Town may submit a request, with appropriate minor modification fee of S 100.00.
to modify the NPDES permit to reflect the Class 11 monitoring frequency at the expanded flow. Upon
modification of the permit, a special condition will be added stating, "When the average monthly flow over
a one year time frame reaches 0.28 MGD, the Town shall submit plans and specifications for appropriate
flow equalization of 25% of total plant capacity or provide information that indicates that plant performance
would not be adversely impacted by influent surges pursuant to 15A NCAC 2H .02190)(6)."
This Authorization.to Construct is issued in accordance with Part III, Paragraph 13 of NPDES
Permit No. NC00_21326issued May 31, 1991. and shall be subject to revocation unless the wastewater
treatment facilities are constructed in accordance with the conditions and limitations specified in Permit No.
NC0021326.
The sludge generated from these treatment facilities must be disposed of in accordance with G.S.
W3-215.1 and in a manner approved by the North Carolina Division of Environmental Management.
In the event that the facilities fail to perform satisfactorily, including the creation of nuisance
conditions, the Permittee shall take immediate corrective action, including those as may be required by this
Division, such as the construction of additional or replacement wastewater treatment or disposal facilities.
The Winston Salem Regional Office, telephone number (704) 771 - 4600, shall be notified at least
forty-eight (48) hours in advance of operation of the installed facilities so that an in-place inspection can be
made. Such notification to the regional super isor shall be made during the normal office hours from 8:00
a.m. until 5:00 p.m. on Monday through Friday, excluding State Holidays.
Upon completion of construction and prior to operation of this permitted facility, a certification
must be received from a professional engineer certifying that the permitted facility has been installed in
accordance with the NPDES Permit, this .Authorization to Construct and the approved plans and
specifications. Mail the Certification to the Permits and Engineering Unit, P.O. Box 29535, Raleigh, NC
27626-0535.
A copy of the approved plans and specifications shall be maintained on file by the Permittee for the
life of the facility.
Failure to abide by the requirements contained in this Authorization to Construct may subject the
Permittee to an enforcement action by the Division of Environmental Management in accordance with
North Carolina General Statute 143-215.6A to 143-215.6C. .
The issuance of this Authorization to Construct does not preclude the Permittee from complying
.vith any and all statutes, rules, regulations, or ordinances which may be imposed by other government
agencies (local, state, and federal) which have jurisdiction.

Permit No. NC0021326
Authorization to Construct
own of Dobson
astewater Treatment Plant _
Page 3 _
One (1) set of approved plans and specifications is being, forwarded to you. If you have any
questions or need additional information, please Contact Susan A. Wilson, telephone number 919/733-
5083.
Sincerely.
Preston Howard. Jr.. P.G.
cc: Sorry County Health Department
Winston Salem Regional Office, Water Quality
Phil Brower, Ivlarziarib-& Minicr
Training and Certification unit
•

cc: Permits and Engineering
_Technical-Support-Branch.
Surly County Health Department N
Central Files 59�4
WSRO OCT 1
SOC PRIORITY PROJECT: YES X NO
IF Yes, SOC No.9323
To: Permits and Engineering Unit
Water Quality Section
Attention: Susan Wilson
AUTHORIZATION TO CONSTRUCT
NPDES PERMIT REPORT AND RECOMMENDATIONS
Date: 7 October 1994
County: Surry
Permit No. NC: 0021326
PART I GENERAL INFORMATION
1. Facility Name and Current Address: Town of Dobson WWTP
P. O. Box 351
Dobson, NC 27017
2. Date of most recent NPDES Staff Report: 20 January 1994
3. Changes since previous action on NPDES Permit: None known
4. Verify Discharge Point(s) on plans with current NPDES Permit. List for all discharge
points.
Latitude: 360 22' 50" Longitude: 800 43' 25"
Attach a USGS map extract and indicate treatment facility site and discharge point on
map.
U.S.G.S. Quad No. B-16NW U.S.G.S. Name Dobson
5. Treatment plant classification: Class II (after upgrade)

PART It - DESCRIPTION OF DISCHARGE AND TREATMENT WORKS
1. Existing treatment facility:
a. What is the current permitted capacity of the facility? 0.160 MGD
b. Date(s) and construction activities allowed by previous Authorizations to
Construct issued in the previous two (2) years: N/A
c: What is the actual treatment capacity of the current facility (design volume)?
0.160 MGD
d. Please provide a description of existing or substantially constructed wastewater
treatment facilities. The facility currently consists of a manual bar screen and
comminutor, influent lift station, "single donut-style" extended aeration unit with
integral clarifier, chlorination, and chlorine contact chamber. Sludge handling
facilities consist of a small circular aerobic digestor and drying beds.
2. Please provide a description of proposed wastewater treatment facilities: The proposed
upgrade to the facility will include fine screening, influent lift station, dual extended
aeration units with integral clarifiers, and UV disinfection. Sludge handling facilities will
consist of two stabilization/storage tanks, bulk lime storage and feed system, and a
transfer and loading unit.
3. Residuals handling and utilization/disposal scheme: Lime stabilization followed by land
application. (W00003796)
4. Important SOC, JOC or Compliance Schedule dates, if applicable: (Please indicate)
Submission of Plans and Specifications 03-31-94 (rec'd 3-31-94)
Begin Construction 03-31-95
Complete Construction 09-30-96
PART III - EVALUATION AND RECOMMENDATIONS
In the previous Authorization to Construct prepared by Lee G. Spencer on May 11, 1994,
the Town of Dobson was required to address eleven (11) items concerning the proposed upgrade
to the Dobson WWTP. After further Regional Office review, these items appear to have been
properly addressed and changes made as necessary. It is assumed that the data relative to power
outage information from Duke Power is forthcoming.

WSRO recommends this Authorization to Construct be issued in accordance with Division
guidelines.
Environment I
Engineer ate
A/A
Water Quality Supervisor Date

NORTH CAROLINA DEPARTMENT OF ENVIRONMENT
HEALTH AND NATURAL RESOURCES
DIVISION OF ENVIRONMENTAL MANAGEMENT
August 17, 1994
MEMORANDUM
TO: Susan Wilson
Environmental Engineer, Permits and Engineering
THROUGH: Steve Mauney
WQ Supervisor,. WSRO
FROM: Lee G. Spencer 7p
Environmental Engineer, WSRO
SUBJECT: Dobson WWTP - Revised Classification
NPDES Permit No. NC0021326
Surry County
Well Susan, here I go again on this one. After conversation
with the Town Manager, Engineer, Dwight Lancaster, and Steve
Mauney, I have now decided to reclassify the Dobson WWTP to a
Class II facility after upgrade. Attached is a revised
classification for the Dobson WWTP after upgrade.
The reason for this and changes are as follows:
1 - Per the Engineer, the Town will not have to supply stand-by,
back-up power. They can show power reliability in the area
in lieu of this requirement, since they discharge into class
C waters . They are installing a telemetry system at the
plant and on the main lift stations, per our request. This
reduces the rating by three points .
2 - The drying beds will of course remain, but should not be
used unless an emergency arises . Dwight Lancaster in
Certification indicated .this was our call insofar as to
count the points or not. We have decided not to since the
Town is cooperating with us on other requests, and since a
Class III rating will up their monitoring costs
significantly.
If you would, please modify the permit's "after upgrade"
page to reflect the reduced monitoring frequencies . If you need
any additional information, please advise. Thank you.
cc: Central Files
WSRO

RATING SCALE FOR CLASSIFICATION OF WATER POLLUTION CONTROL SYSTEMS
Name of Facility: Do8sa.)
Owner or Contact Person: 0411 J A- 147_2Gr�l t- y 7-0,4Al M#.1,*6 e-e
Mailing Address: 3Sr l ease.✓ .vc y 74917
County: Telephone: �)3B('—B9GP
Present Classification- C-4 Now Facility Existing Facility t = -
NPDES Per. No. N000 21926 Nondisc. Per. No.WQ Health DeptPer No.
Rated by: LE Telephone: t19/o)g96-7cV7 Dater Z �4
.Reviewed by: Health Dept Telephone:
JILi Regional Office Telephone: gyA 7_7
�+ Central Office Telephone:
ORC- &z2 T'Is Grade: 7 Telephone: (91c?SF6- 42.
Check Classification(s): _ Subsurface Spray Irrigation Land Application
Wastewater Classification: (Circle One) I III IV Total Points: SD
PLANT PROCESSES AND RMATID CCNTFOI FOUIPMR41'Y iO4 ARE AN NTIMRAI PART OF NI)LISTRIAL PRODt C'TION SI-WI NOT BE
C- WASTE TREATMeIT FOR THP PURPOSE OF UASSIFICA.TION ALSO SEPTIC TAW SYS�CONSiSTPa Cr`IY OF SEPTIC TANG
AND QRAVITY W IFx'_AnM LIKES ARE DCEMPT FRG.!CLASSIFICATION
SUBSURFACE CLASSIFICATION — —+--_—SPRAY IRRIGATION CLASSMATION
(check all units that apply) (check all units that apply)
1 septic tanks 1 preliminay treatment (definition no. 12 )
22 pump tanks 2- lagoon
siphon or pump-dosing "am 3 septic tanks
t sand fillets 4 pump tanks
5. grease trapinlerceptor 5 pumps
S oiVwater separstom S sand Mom "
7 gravhy subsurface treatment and disposal: 7- grease ImpAnUrceptor
B. preswre subsurface treatment and disposal: 8. oNwater separators
8 disinfection
10 chemical addition for nutrient/algas control
11 spray Irrigation d wastewater
In addition .to the above cfesslficalions. pretreatment of wastewater In excess of these components shall
be rated using the point rating system and will require on operator with an appropriate duel certification.
LAND APPLICATION/RESIDUALS CLASSIFICATION(Applies only to permit hclde)
1. Land application of biosolids, residuals or contaminated soft on a designated she.
WASTEWATERTREATMB4T FACILIT(CLASS IFICATICN
The following systems&hail be assigned a Class I classification, unles%the flow Is of a significant quantity or the technology Is unusually
complex,to require consideration by the Commission on a case-by-case basis: (Check 11 Appropriate)
1 OiVwaler Separator Systems consisting only of physical separation, pumps and disposal;
2 Septic Tank/Sand Filter Systems consisting only of septic tanks,dosing apparatus, pumps,sand filters,disinfection
and direct discharge;
3. lagoon Systems consisting only of preliminary treatment, lagoons,pumps,disinfection,necessary chemical treatment for
algae or nutrient control;and direct discharge;
4. Ciosed-loop Recycle Systems;
5 Groundwater Remediatlon Systems consisting only of oD/water separators,pumps,alr-stripping, carbon adsorption,disinfection
and disposal;
S. Aquaculture operations with discharge to surface waters
7 Waler Plant sludge handring and back-wash water treatment;
S. Seafood processing consisting of screening and dlsposai.
g- Single-family discharging systems,with the exception of Aerobic Treatment Units,wilt be dassTmed if permitted after July 1,
1993 or If upon Inspection by the Division,h Is found that the system Is not being adequately operated or maintained Such
systems will be notified of the classification or reclassification by the Commission.In writing.

REM POINTS
(1) Industrial Pmrssmers links a Industrial Pmirsatmort Program(aoe dslbRbn No.
(2) DESIGN FLOW OF PUNT W gpd(rot appncable to roncoruanWtsd cooing actors.sludge handing facilities far
water purification plants,totally dosed cycle symome(ses derMan No.I)and facilities ccrisslbg Cray d Gam
(4xd) or hers (e)(d) and (11)(dll
0 - 20,000 1
20.001 - 60.000
60.001 - 100,00a 2
100.001 250.000_ A
250.001 - 600.0
250.001 - 1.000,00,000__ 3
1.000,001 - 2.000.000_— ---to -
- 2.OD0,001 (and up) me 1 polm AddkbrW for each 200,000 god cape NY W 10 a Madnatrtt Of +o
Design Flow (gpd) 9so silo
(7) PRBJMNARYWMSNRDCESSES(esidoaribrt NttM
(a) or
(b) Mechanical Saears,Static Screams r COmNMirtg Dsvkss
(C) Grs Rnrsrd .t
or
(d) Mechanical or Araed GA Aenwvsl 2
(a) Fbw Measuring Devb .1
or
((t) bstmmsrded Flow Moa e auremrn - v
(g) Preas M0cn,---- 2
(h) . Mloars Flow Equalization._—__ _ 2
(1) Grasse or 00 Separators-Gravly +
Mechanical..-- — J
Dlsaolvsd Air Fkaatlrt�__
(() Prachbrinetbn_
(a) PR0AAMTREA.TMENTlNrTSPROCESSei
(a) Septic Tank ("a definition No. AM +
(b) knhotl Tank__-- .3
1c) Primary Clarklkm _ w
d) Semling Ponds or Setting Tucks for korgarsc NorNmk Materials(sludge hv+dlirg facilities for water
purification plans,sand,gravel.stone.and other MWM operation except mosalirtal acmiss such ae gem
or gold mini g)... _—_•_-- +
(6) SEQ7LARYTREATMENTtf115PfOC6:sES
(a) C4rb0naw0us SM2e
(I) Aeratbn•Hiph Purity Oxygen Syste on
Diffused Air Systam._____
Mechanical Air System (fixed. Aoalkg or rotor) - s
Separate Sknlpe R"Welon
(0) Tric"Filer
High Rra
Standard Rau_ -- 3
Packed Tower. 3
M Blologlcal Minted Finvr or Asated Biological Finer 10
(Iv) Aerated Lagoons.._—__— 10
(v) Rotating Biological Cordadom_— __.10
(N) Sand Filters -intennhters biologic" 2
Rocirculalln0 blological +
• (v0) StabNzoon Lagoons—
(Ix) Single slaps syslom for Combined carbonaceous removal of BOO and nhmparoue I.
nftff�catbn (see dollnhfon No. 12)(Po'uds for this kom have to be In addition to its=
(S)(a)O) through (5)(a)(v0I).
utilizing the ascended aersibn process(sae deflMbrf No.3a)
utnizing other than the e.tonded aeration pries �'•�Fa�
(a) Nutrient adduct to enhance SOD rsmovd_�__ a
(11) Biological Culture (Super Bugs-)addhbn.�.__ a
(b) Nluogano" Stage
(I) Aeration - High Purity Oxygen System +0
Dmumd Air
Mechanical Air System (fIzed. ficatkg or mor) a
Separste Sludge
Ig) Trickling Fktor-High Rate 7
Standard Rate_—_ s
Packed Tower___.—_—_— 3
Siolog!cal Aerated Filter r Aerated Bloiogkd Finer 10
tv) Rotating Blologicd Comaclors.. _ 10
v) Sand Flier-Interment bbbgkol ______
Recirculating btotogleal +
(vat Ccaryr._ _ e
(6) TERTWW OR ADVANCED TREATMENT WRS'PiOCESSB
(a) Adliated Carbon Beds-
wlthout carbon mgoneralto, w
vAh carbon mgenombn._.._ 16
(b) Powdered.or Granular Actbaled Carbon Feat .
without carbon regeneration—
with carbon mpartencton_ _------ 16
C) Air strlppfrg____...—..�__._—�—� 10
d) DonfirKcatlon Pnocees_.__._.__.»._----_—_------------
e) - Elecim lalysb..._
f) Foam Separalbn„....--._--...— —__.-- --....--.--- a
g) ton Eacharge....... 3
(h) land AppOcmlon of Treated Effluent (see definition No.22b) (rot applicable fr sand,gravel.stone
and ctho( cbnllar mining operations) by high rate
�)) Phosphorous Romoval by Biological Pmcesses(Sae doW]on No.26)_.— ----20
(k) Polishing Ponds - Ihouf aeradoa—
with seratittrt—

(a) Treatment proastses for removal at metal or cYanlde_ __ _« — ---_«««-1 5
(P) .treatment processes for removal of toxic materials Otter than metal or cyanide 15
(7) SUAGETREATMENT
(a) Sludge Diii Tank- Heated (anaerobic)
Aerobic -10
Aerobic
Unhealed (aruerode)- 3
- - (b) Sludge Stabilization(dernicd m themaq.
(a) Sludge Drying Beds-Gravky_ -
Vacnrum Assisted.-»__ _
(d) Sludge Efutriatbn«Y__:-___««
(a) Sludge Conditioner (chemical Of thermal) 3
(f) Sludge Thickener (grsvhy)...___—_--�- ---
(0) Dissolved Air Flotation Unh Irof applicable to a unit ruled as (3)(i)1-------- --•-d
(h) Sludge Gas Utilization Onciuding gar storage)
(I) Sludge Holding Tank • Aeraled-
()) Sludge Incinerator(rot Inducing activated carbon
(k) Vacuum Filter, Centrifuge.or Filler Press or other similar dewaterirg devices 10
(8) RESIDUALS UTaIZAT1OWDISP0SAL(hduding Incinerated ash)
(b) Land Application(surface and subsurface) (sea de6nitbn 22a)
by contracting at a end application operator Or landfill operator who holds the end application permit or landfill pemuN_____.__.___ .».».______...____...._«_.».._«__.»«_«._«�.._«««_.2
(c) Dedicated Landlw(burial) by the pannbtae of the wastewater treatment facuby_
(0) 09JiCTION
(a) Chbriratbn»_
(b) Dechlo *an
. (c) Ozore__�r_.�_�M««�__
(10) CHEMICAL ADDITION SYSTEM(S)(use definition No.9))rot applicable to demicel ddbbrs rated as 4m(3)0).
(5)(a)(xl). (6)(a). (6)(b). (7)(b)• (7)(0). (ace). (9)(b) or (9)(c) 5 points each:
Ust ___—_—_—__«___
(11) &=81ANEOUS LNITSPFOCESSES
(a) Holding Ponds,Holding Tanks or Settling Ponds for Organic ar Toxic Materials Inducing wastes from mining
operations containing nitrogen or phosphorus compounds in amounts algnakartly greater than Is common
for domestic
(b) Effluent Flow Equalization(not applicable to storage bashu which are Wwem In tend application systems)--2
(c) Stage Discharge (not applicable to storage bas)ns Inhehont In lard application systems)
(d) Pumps.__«____
(a) Stand-By Power Supply---•.-r__� /
(1) Thermal Pollution Conml Device—_TOTAL POINTS�—
CLASSIFICATION
cum l.._ Polmm
Class IL_ —_ —26.50 Palms
"---
cuss 11._ Palms
Class N__��.__�._�__.-�._w___«-_«».__.��66•Up Pains
Fadutlas having a ruling of oro through four P0111115,Inclusive,do not require a certified Operator.
Fadlhlac havig an adiraled sludge process will be assigned a nirdmum classification of Cass 0.
Facilities having treatment processes for the removal all metal Or cyanide will be assigned a minimum dass5lntion d Class IL
Fadhies having treatment piocesses for the biological removal of phosphorus will be assigned a minimum dassScatbn of Class III. -
DOW DEFNRIONS
The following dennhlons shag apply throughout this Subdapler.
(1)Activated Carbon Beds. A physkallchemkal method for reducing soluble organic material from wastewater effluent;The column-type beds used In this
method wig have a flow rate varying from two to eight gallons per minute per square foot and may be either upibw or downf aw carbon bads- Carbon may W
may rot be regenerated on the wastewater treatment plant abe; -
(2)Aerated Lagoons. A basin In which all solids are maintained in suspension and by which biological Oxidation or organic matter Is reduced through anifidally
&=Totaled transfer of oxygen on a flow-through basis;
(3)Aeration A process of bringing about Intimate contact between air or high putty Oxygen In a liquid by spraying. agitation or mttuslong3a) Extended
Aeration. An activated sludge process utilizing a minimum hydraulic duernion time of to hours
(e)Agricubunny managed she. Any she on which a crop is produced.managed,and harvested(Crop Includes grasses.gralri,those,ate.);
(5)Air Stripping. A process by which the ammonium ion Is Ilml converted to dissolved ammonia (pH adjustment)with the ammonia than released to the
atmosphere by physical means;or other simuar processes which remove petroleum products such as benzene,toluene.and xylere;
(6)Carbon Regeneration The regeneration of exhausted carbon by the use of a furnace to provide extremely high temperatuhos which Volatulze and oxidize the -
absorbed Impurltleq
(7)Carbonaceous Stage. A sage of wastewater treatment designed o•achleve Necorday effluent 5nths;
(8)Comfitu0e. A mechanical oevlm In which centrifugal force Is used to separate solids from liquids or to separate liquids of dRlerent deraC.as;
(9)Chemical Addition Systems-The adcMIon of chemical(s)to wastewater a7 an application point for purposes of Improving solids removal,pH adjustmem.
afkallnhy control,etc.;the capability to experiment whh different chemicals and different application points to achieve a speclfk hosub will be considered one
system;the capabilhy to add chomical(s)to dual units wig be rated as oro system;capability to add a chemical at a different application ponds for dhterard I
purposes wig result In the systems being rated as separate systems;
(10)Chemical Sludge Conditioning. The addition of a chemical conpound such as gme,enk chloride,or a polymer to wet sludge to coalesce the mass prior to
Is appgcallon to a dewatering device;
(11) Closed Cycle Systems. Use of holding ponds or holding tanks ice containment of wastewater containing Inorganic,non-tortc materials from lid,gravel
cashed stone or other similar operations.Such systems shag carry a maximum of two points regardless of pumping facilhim or any other appunerances;
(12)Combined Removal of Carboraceoue BOO and Nitrogenous Removal by Niuhicatbn-A single stage system requlmd to achieve permit effluent limits on 50O
and ammonia nitrogen within the same biological reactor
(13)Dxhiorinetlon The partial or complete reduction of residual chlorine Ina liquid by any chemical"Physical process;
(14) Denllrt iaatbn Process. The comeholon of nbrate-nitrogen to nitrogen gas;