NC0066966_Staff Report_19950728

NPDES DOCUHENT SCANNIN` COVER :SHEET
NPDES Permit:
NC0066966
Quarterstone Farms WWTP
Document Type:
Permit Issuance
Wasteload Allocation
Authorization to Construct (AtC)
Permit Modification
Complete File - Historical
Engineering Alternatives (EAA)
Correspondence
Owner Name Change
'../.‘7C7L) fe/Or *
Instream Assessment (67b)
Speculative Limits
Environmental Assessment (EA)
Document Date:
July 28, 1995
This document is printed on reuse paper - lore any
content on the reYerse side

NORTH CAROLINA DEPARTMENT OF ENVIRONMENT
HEALTH AND NATURAL RESOURCES
DIVISION OF ENVIRONMENTAL MANAGEMENT
July 28, 1995
MEMORANDUM
TO: Mack Wiggins
THROUGH: Steve Mauney
FROM: Ron Linville c/ /
SUBJECT: Permit Renewal Request
Quarterstone Farm Association/NO0066966
Guilford County
Please be advised that the WSRO is unaware of any major
changes associated with this proposed discharge since the
previous staff report (see attached). The Region previously
requested a flow limit correction from 0.20 to 0.16 MGD.
The Region recommends reissuance of the NPDES Permit with
any normally anticipated limit modifications. Residual chlorine
reduction limit is recommended. Name and phone number changes
are on the classification rating attached.
cc: WSRO
Central Files
Technical Support
Guilford County EHLTH
a:\gtrstone.rnw

cc: Permits and Engineering (NPDES)
Technical Support Branch
Guilford County Emergency Management
Central Files
WSRO� Date February 22 1991
Page 1 of 4
NPDES STAFF REPORT AND RECOMMENDATIONS
County Guilford
NPDES Permit No. NC0066966
PART I - GENERAL INFORMATION (Name Change & Renewal)
1. Facility and Address:
Quarterstone Farm WWTP, near the junction off Huffine
Mill Road and Red Cedar Road. Mailing Address: Mr. N.
Donald C. McMillion, Chairman, Board of Directors, J a.
Quarterstone Farm Association, Inc., 400 W. Market
Street, Suite 102, Greensboro, N.C. 27401 ...
2. Date of Investigation: December llth and 12th, 1990
3. Report Prepared by: Arthur R. Hagstrom, Environmental .. „
Engineer, DEM, WSRO, WQ . \
v
4. Persons Contacted and Telephone Number: 'v
Rhett Linsay, Perry Lee Smith, and Leonard Stogner,
�� Operators for WWTP, 704-788-9497 e
�— o
' ��'- y 9-274-0742(4
1"cf• j+ irectfons to Site. Take Huffine Mill East to Jct.
,;jl with McLeansville Road (SR-2794) and then to Redcedar
-,i (''. Road.(SR2714). Site is to the South of the Jct. of
&I. t'''�9,1.Redcedar Road and Huffine Mill Road at Buffalo Creek.
Discharge Point - Latitude: 36° 8' 16"
Longitude: 79° 39' 7"
Attach a USGS Map Extract and indicated treatment
plant site and discharge point on map.
USGS Quad No. C2ONW or
USGS Quad Name Browns Summit
665+/-
Size (land available for expansion and upgrading):
Adequate for WWTP/the over-all site being developed is
over 100 acres+/-.
trN

Page 2 of 4
NC0066966
February 22, 1991
8. Topography (relationship to flood plain included):
Rolling farm land. Small flood plain on WWTP's side of
the stream. Bank rises sharply from stream and WWTP
placed above any flood level.
9. Location of nearest dwelling: Approximately 300'
through wooded buffers.
10. Receiving stream or affected surface waters: Buffalo
Creek
a. Classification: C-NSW
b. River Basin and Subbasin No.: Cape Fear (Haw
River); 03-06-02
c. Describe receiving stream features and pertinent
downstream uses: The receiving stream at the point
of this discharge has received the wastewaters from
most of Greensboro (North Buffalo, T.Z. Osborne,
Cone Mills, Etc., WWTP's) and as such is the waste
carrier for the area. The creek flows through
generally rural then changes to urban and City as
it joins other streams.
PART II - DESCRIPTION OF DISCHARGE AND TREATMENT WORKS
1. Type of wastewater: 100% Domestic
0% Industrial
a. Volume of Wastewater: .200 MGD Permitted but
currently less than .025 MGD (Development slow)
b. Types and quantities of industrial wastewater:
N/A
c. Prevalent toxic constituents in wastewater: N/A
d. Pretreatment Program (POTWs only): N/A
in development approved
should be required not needed
2. Production rates (industrial discharges only) in
pounds: N/A
a. highest month in the last 12 months
b. highest year in last 5 years

Page 3 of 4
NCO066966
Februry 22, 1991
3. Description of industrial process (for industries only)
and applicable CFR Part and Subpart: K/a
4. Type of treatment (specify whether proposed or
existing):
This existing treatment plant is a 0.160 MGD wastewater
treatment facility consisting of approximately 250
linear feet of 6-inch force main, a 250 GPM wet well
pump station equipped with duplex submersible pumps, a
high water alarm, gate valves and a removable
barscreen, odophos feed equipment; dual 80,000 PGD
contact stabilization treatment units, each consisting
of a 24,970 gallon reaeration tank and a 19,500 gallon
secondary clarifier, a 2,444 gallon aerated sludge
holding tank, a 1,431 gallon chlorine contact tank with
gas chlorinator, three 300 cfm blowers to serve the
entire plant; recording effluent flow meter with
totalizer; with discharge directly into Buffalo Creek.
Only half of the treatment system is currently being
used by ORC choice.
5. Sludge handling and disposal scheme:
Contract pumper to North Buffalo WWTP (Greensboro)
6. Treatment plant classification: Class
7. SIC Code 4952
Wastewater Code(s) 05
PART III -.OTHER PERTINENT INFORMATION
1. Is this facility being constructed with Construction
Grants Funds (municipals only)? N/A
2. Special monitoring requests: No
3. Additional effluent limits requests: None
4. Other: This WWTP has been producing an effluent that
is adequate. One half of the system is currently
inoperative and has been out of service for approx. a
year. The remaining half has produced a compliance
effluent.

Page 4 of 4
NC0066966
February 22, 1991
PART IV - EVALUATION AND RECOMMENDATIONS
The WSRO recommends that this NPDES Permit be renewed
and issued as requested.
Wt
4tPu4-irR.)\Signature of repo preparer
417
Water Quality Supervisor
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INTENIOR.OEOLOOICAL SURVEY. WASH *TON. O. C.- I•70 36°C
123°E 79°37'30'
Hnt v.1.�1L'
• • Mfry YV!••••••••.••r • =N••no. viir • I••..•M• Y•1edlyYw
ROAD CLASSIFICATION
I .i,hf.1ll►ty

r
H
r TING SCALE FOR CLASSIFICATION OF WATER POLLUTION CONTROL SYSTEMS
Name of Facility: a-, - s Fo — r� • (.J w T
Owner or Contact Person: 0'0,14 C... iYl ` YYt (t cf„
Mailing Address: 619-0 w . Ina-v. 74 '•74 : S ' A e_ /o 2-- a-r" 10-%. u a s/v/
•
County: C / d Telephone: 9i Q� Z 7 i - oa sag
Present Classification: /f New Facility Existing Facility^
NPDES Per. No. NC00 .661 66 Nondisc. Per. No.WQ Health Dept.Per No.____
Rated by: PR. A; Aid; I (ems Telephone: (/0 77 l -l6cry Date 9S' 7.2 r
Reviewed by: , Health Dept.
Regional Office
Central Office
ORC: L Grade:
Check Classification(s): _____SSubsurface Spray irrigation _
Wastewater Classification: (Circle One) I 111 IV
Telephone:
Telephone:
Telephone:
Telephone:
Land Application
Total Points:
-9r'Ti
PLANT PROCESSES AND RELATED CONTROL EQUIPMENT WHiCH ARE AN INTEORAL PART OF INDUSTRIAL PRODUCTION SHALL NOT BE
CONSIDERED WASTE TREATMENT FOR THE PURPOSE OF CLASSIFICATION. ALSO SEPTIC TANK SYSTEMS CONSISTING ONLY OF SEPTIC TANK
AND GRAVITY NITRIFICATION LINES ARE EXEMPT FROM CLASSIFTCATTON,
SUBSURFACE CLASSIFCCATION
(check all units that apply)
1 septic tanks
2 .pump tanks
3,__siphon or pump -dosing systems
4. sand filters
5 _ grease trap/interceptor
6oil/water separators
7,_gravity subsurface treatment and disposal:
8. pressure subsurface treatment and disposal:
SPRAY IRRIGATION CLASSIFICATION
(check all units that apply)
1preliminary treatment (definition no. 32 )
2.lagoons
3septic tanks
4pump tanks
5pumps
6sand filters
7"_,grease trap/interceptor
8, oil/water separators
9 disinfection
10.__chemical addition for nutrient/algae control
11 _spray irrigation of wastewater
In addition to the above classifications, pretreatment of wastewater in excess of these components shall
be rated using the point rating system and will require en operator with en appropriate dual certification.
LAN6APPLICATION/RESIDUALS CLASSIFICATION (Applies only to permit holder)
1. Land application of bllosolids, residuals or contaminated soils on a designated site.
--
WASTEWATER TREATMENT FACILITY CLASSIFICATION
The following systems shall be assigned a Class I classification, ijnjess 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 it Appropriate)
1. Oil/water Separator Systems consisting only of physical separation. pumps and disposal;
2_Septic TanWSand Filter Systems consisting only of septic tanks, dosing apparatus, pumps,sand titters, 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. Closed -loop Recycle Systems;
5,,_Groundwater Remediation Systems consisting only of oil/water separators, pumps, air -stripping, carbon adsorption, disinfection
and disposal; .
6,_Aquaculture operations with discharge to surface waters;
7`_Water Plant sludge handling and back -wash water treatment;
8Seafood processing consisting of screening and disposal.
9. _Single-family discharging systems, with the exception of Aerobic Treatment Units, will be classified if permitted after July 1.
1993 or if upon inspection by the Division, It 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.

The following scale is used for rating wastewater treatment facilities: (circle appropriate points)
ITEM POINTS
(1) industrial Pretreatment Units or industrial Pretreatment Program (see definition No. 33) ... 4
(2) DESIGN FLOW OF PLANT tN gpd (not applicable to non-oontam►nated cooing waters. skidoo handling facilities for
water purification plants, totally closed cycle systsms(see definition No. 11). and facilities consisting only of item
(4)(d) or hems (4)(d) and (11)(d))
0 • 20.000..NNN•_ .N...... NN...NN......_..•...N.N..•N.....Own ....... NN.»»N.N..NN»NNM .....►....►.. 1
/�
20,001 - 50,000........ N•NN.►.►N...... One _. SON MN. •N.►N.N.N..».NN..N.M.N.»N..N►»NNN».N..N N..»N.2
50,001 - 100,000 N.N.N.NOil N►.►..N. NN.N.•N N••NN....N. One .NNNNN.win•.►NM...N•.NMN.N•...OHO N»N.....
100.001 • 250.000......... _•...•N..N..N... ...... ....N..... NOWN .►•NNON. N._NN..... N•N••N.ONO -...... f.
250.001 - '500.000 ..NN•....... NN.......••.► N•N..N•O....NNNN.N.. NNN•••••N•NNM•NN•NM•••N•N•.»•.N
500.001 - 1,000.000 •..• N.N•N.•N•.N••..N..._•.N•»NN.....N•NNNOW/ ....N..N..N .5
1.0006001 • 2.000,000 N..N...........N....-N........... •»•.•.N.•..10
2.000,001 (and up)) rate 1 pekesat ttbnal for *soh tit00.000 tly UP sspaop to II111111ttmum Of .....N.N.N.9 N.0
Den Flow 0 u, 427
(3) PRELIMNARY UNiTS/PROC SSES (soe definition No.32)
(a) Be/Screed—...N. .N.».»»....N..NN.N...N..NN.N•N•NNNN•N•NN••N _•.NN. None NNN...eel)
(4)
(5)
or
(b) Mechanical Screens. Static Screens or Comminuting Devices ._•_._ ...MNN_•N._ ... . »2
(c) Grk Removal»....N......»»....... ......N....»... ». ... one .»».....».................. Nee •_•.«•.•..».•.. a 7 ..4a�
or
(d) Msctwttcal or Aerated Grit Removal ......».».»... woo .».»...........»....N..»••••••MN.....N.N.se* .NN..»NN........»...... 2
(e) FlowMsasuring Device».»»..»....one .»....».....»...... »..Nnee ....»...»......»..»...»....... » one woe ...N.non, own ...» nee ...... N..1
Or
(f) Instrumented Flow Measurement......»..NNN....».................»»... NINO.0. 0.. ��•»..».•. �.»»..»........».
(9) Preaeratlon.. ».. .........»..»»NNN_• »• 00000000 »N_ ....
.. N.... ••••. N.•
(h) Influent Flow Equalization N..•.•»•..»•.»......»...N..N_....•».•_....•.• see .......N»••»...........2
(1) Grease or 011 Separators • Gravity ............ ..».»~»_.»...•.»•.•._ •_» ..•.....•. N..•.. _ 2
Mechanical.»......»».....»N»..»»».......».........»......•N..»••».............»........»..»»............».»....».N...3
Dissolved Air Flotation ...»....»....»...»•...N.•••.......»»._..•...•.........».•.••.N......•.•own ._... .e
(vi)
(5) IERTIARYORADVANCEDTREATM?4TUNR*.a'PitOCESSES
(a) Activated Carbon Beds -
• without carbon rsgensratlon»»NN.N.»._N._..»...N...... ••»»5
with carbon npsneralbn.N.........._._-_..----N-_.N-•-•i.••.._.N••-M•.••.•.-- - ----IS
Powdered or Granular Activated Carbon Feed.
•»»-•-•-•»»�S
without carbon regeneration--.--
with carbon MOP
nsratlon--_-_.-..--lee »-N- AO*
..N»_-»-»-.--»-»N-MOOD
.•-...•-----_.•»_-,-..•.»-»-».-.•»_»15
(a) Air stripping..N-.»...».N......N--»»..»-_.»».»......._._...._..-»..........»......_. .».-...--_---...»N.....»..-5
(d) • Denkrificatbn Proosss...._....NN_•N-N-._--..-......_..».».».».....--.._- - --.---- •»•..^•N....»----.-_-..10
(*) Eiectrodialysis.NN. .-.... -.-.-.-»....._.»....•.-»•--N•-N----w----�--...-M.»-5
(f) Foam Separation......._-._..._.-.N»..».._......-_--N--»».»NN»»...•--..-.»».....----•••-•---.•.---5
(9) ion Exchange..................N...........N..-.--._..--._.........--..----..N.N......--.•...-.N-.N..-.»»-..-...N»_-.--.-.-_..»....-».r•5
Land
lication of Treated
sm
definition No.
not
(h) and other similar mining op.raitlons by high rat. inlifi atio( applicable for sand. gravel.......l.
I) flrttcroscreens.....•-••NNN..-N...-.-.-..•-------------»-•••••••-».....--_»»N.._».._.--- •».._...--_•..»».... - L
Phosphorous Removal by Biological Noonan (See definition No. 28) N-.»»_.....N-»..-«-...-»--------..-»-...•».-2 o •/% / .
iC) Polishing Ponds - without asratlon....-..--NN..............,.--_ -••••2 04. r (r Zed
with sent
(1) Prechtortnatbn »N._•N.»•OW. N........»»».gee N.NNN.»one erne .»N.».»..»».».nee .. nee ....»».N.5
PRLMARYTREATMENT t riTTS/PROCESSES
(a) Septic Tank (see doiinition No. 43).».»»NNN»NN..NN.....N..»N.».».........»»..N..N..NN.»»N»N»...»N.....»....»...2
(b) Imhoff Tank. ..N• One* N_•-»..».•.•....»•.►•»•»•... Nee .•...».. OWN. »......»•....Nnew. ......»...»N..-.......N....N....N .5
(c) ‘Primary Clarifiers ..•.••..•.•....»..••.»•...»•.••.••._»N.......•N•.....••.»•.•.••.••..N.•-. .............5
(d) ' Settling Ponds or Settling Tanks for inorganic Nontoxic Materials (sludge handttng facilities for water
purification plants. sand. gravel. stone. and other mining operations except recreational activities such as Qom
orgold .............-.-...mining)... OM N....••.NN•......»•.N»•N.N•.••....•N•.N N..»...».N N. N. N. 1...N2
SECONDARYTREATNtB1T urcsofflocemEs
(a) Carbonaceous Stage
(I) Aeration -High Purity Oxygen System.. -- .......... ................2 0
Diffused Air System •...».».»N....N...........N»._»•».....•.N... ....•._«•»....
Mechanical Air System (fixed, floating or rotor)....._»._»»»»....-.. - ......
Separate Sludge Reaeratlon.N._._......._..._.N.N-.._._...•-_N.N.N..-».N..»».»...N.».».N.N......3
(i1) Trickling Filter
HighRate ...-.•N__-«Oboes -....N•_N.NN-N »•N•»N-•»•»N•••••••••»••••• 7
Standard Rate......0.00000100010e.000e0000600600000060000.00000.0004.0000»»»»...»•NN.NN..»..N»»»»N...........5
Packed Tower..........N....»....»..»..»...N.....»»»»N.NN.N....N•N.N.N.»....N....N....N»...N....N...S
(III) Biologicai Aerated Fitter or Aerated Biological Filter •••....N»N.NNN.».NNN...N..•NN.NNN.N.N..»•10
(Iv) Aerated Lagoons .......N•..NNOne •N••••NN».».»SOH NN..-•....N•••••N•N•.••►N•.N.••»N•.•••.•.N•NNNNfeel 0
• (v) Rotating Biological Contactors N••N•NN•.••NN••••»•N•N.•NN......N.N..»•••N..N_.......N.10
(vi) Sand Fitters -intermittent biological......_.. _ _ ..».»...•»»»»».....»»--»••-•• 2
Recirculating blolaglcal....._......._»»..».»_..._.......•........••»•»»••••••N»•••••Woe »••»»••••••3
OMStabtttzatbn Lagoons .....•..»_ N__N_._ N».
►•.•.-..NN.N.._....N.N.»
(I1Minor N.N._._..•w. ».•_..•NN•_. N•._...........N.... N....N•N
x)1) Single stage systom for cornbtnod carbonaceous removal of DOD and nitrogenous removal by
nitrification (see definition No. 12)(Points for this kern haw to be In addition to Items
(5)(a)(i) through (5)(a)(vl11).
utilizing the extended aeration promise (see definition No.3a) _.__..•_.._.._.._.»...»-.......-2
utilizing other than the extended aeration process......_..»».......»».»...._.._._._........»._...e
(x) Nutrient additions to enhance BOD removal......_..........._....._..N_.►___.._.N»._._•_5
(xl) Bblogicai Culture ('Super Bugs')addkbn...►._....._._.—....•••._.•__...-•._..................N.NS
(b) Nitrogenous Stage
(I) Aeration - High Purley Oxygen System— - - .......... « 20
Diffused Air System....._ ..._...-...__•N••►NMN•_•_W_•.-•_.M.-._•••••....N10
Mechanical Air System (fixed. floating or rotor)»»_»__.»..,,.N».».»_»w»•-...»......-•»••••»••9
Separate Sludge Reasration....»....»».»_....-_.-.....-._-»•.•._N...._.N..._.» 3
(It) Trickling Filter -High Rate. - •»•»»•••••-•.»•••••••00 7
Standard Rate....»-»--»._..•..N»..».._.._._..__«»._..-._-»_-__N•_•»»N_---••-».•...»..__._»...5
Packed Towsr..........._...»........._-.•._..._._.._».-..»...»..._--.»...._»N•».••» - ....»
(pro Bbbglcal Aerated Filter OrAerated Biological Ftder.__..._N....»-._-..•»..__- ._•150
(Iv) Rotating Biological Contaclors..•..-.....N.•.N.•N».»....-.-_._....__...••••••_.._.» .10
(v) Sand Fitter - Mtsmttltertt biological•..»..»_0000600-60--00006610•000•000060006600060000006.N.000002
R.circulating biologkal..........».»._--.-..._»...........».»»....».»-•«»---••»•••3
■�
� arEI .••_N.N•-»__••_•__••••M•___•N•N.•___•••••-•••_».M•.-••__.---.-----•----NN_._I__•_-_-••••-_.5

diffused or mechanicaL.N•N►NOON.►N.N.NNN..••OON. NOON. w 2
(m) Reverse Osmosis w w A
(n) Sand or Mixed -Media Fitters . leW nta............i.•..•«Nr»NwNNN...w.everN...Nw».ww.wN.N.».«NN»»»«•••r•w•w»2
NOrate .....»....»wN.N.N....N.N....•.N».............»...N.......5
(o) Treatment processes for removal of metal or cyanide ... ... t 5
(p) treatment processes for removal of toxic materials other than metal or tyarmlde.....».»».»».»r.»».»».»_.N»....15
(7) .L GETREATi E1T •
(a) Sludge'•�`Digestion Tank - Heated (anaerob c)..N•.w..NNN.N w.......»».....r.......wN»...».N...w ts_
Aerobic ...N..NNN...........»N. N....Nw ...... •N...N....N............N...•
Unheated (anaerobic) .3
(b) Sludge Stabilization (chemical or thermal) 5
(a) Sludge Drying Beds • Gravity ... .2
Vacuum Asslsted....N.N. N•.»NNN•... 5
(d) Sludge Etutrlation ... .5
(e) Sludge Conditioner (chemical or therrnal).N».Nr..N..».......N..... w..... ..... ..... NNrN».NN•.N...N.»...N. .5
(i) Sludge Thickener (gravity) . ..••.... 5
(g) Dissolved Air Flotation Unit (not applicable to a unit rated as (3)(1))........ NN..NN.w .8
(h) Sludge Gas UtCIlestlon (Including gu storage) ......•.w•N.N.N... .» 2
(I) Sludge Holding Tank • Aerated N. 5
Non -aerated 2
()) Sludge incinerator (not Including activated carbon regeneration) 10
(k) Vacuum Filter. Centrifuge. or Filter Press or other similar dewatering devices.. .N» 10
(8) RESIDUALS i1TILIZATION/DiSPOSAL (including Incinerated ash)
(a) Lagoons . 2
(b) Land Application (surface and subsurface) (see definition 22a)
by contracting to a land application operator or landfill operator who holds the land application permit
or landfill permit 2
(c) Dedicated Landfill(burial) by the permitts° of the wastewater treatment facility..»..N ..... N........N.NNN........»SS
(9) (a) Chlorination 6
(b) Dechtorination .5
(c) Ozone NN... .5
(d) Radiation 5
(10) CHEMICAL ADDITION SYSTEM(S) ( see definition No. 9) (not applicable to chemical additions rated as Item (3)a).
(5)(a)(xi). (6)(a). (6)(b). (7)(b). (7)(e). (9a). (9)(b) or (9)(c) 5 points each:
List .5
.5
N.•N. N• 5
N..N.•..•.• N N• NNN..N..N•N•.NN..N..... 5
(11) 1.ISCBJANEOUS UNITS/PROCESSES
(a) Holding Ponds. Holding Tanks or Settling Ponds for Organic or Toxic Materials including wastes from mining
operations containing nitrogen or phosphorus compounds in amounts significarilty greater than is common
for domestic wastewater .4
(b) Effluent Flow Equalization (not applicable to storage basins which are inherent In land application systems).--2
(c) Stage Discharge (not applicable to storage basins inherent in land application systems)_.N_NNNN»r_. .
(d) Pumps ....... ».N..»...N..N.».....».»....•.N.»....».......w....N. NN.Nw.N.N.NN.....NN. w�
(e) Stand -By Power Supply. ........ N.N.N.N.N.N•N•.....N.wN•N.•NN.•NwN.N..•N.N•••.N• N.N........N..........•• •
(1) Thermal Pollutbn Control Device ...•NN.......N...N..•.N.
TOTAL POINTS
CIASSFICATION
wN.NN..•5.25 Points
Class 11 ». ». .»NN.26.50 Points
IU•.. NN..•..N.•..N...•........N....... .. ...•.NN.•.51.65 Points
Class IV.N..N..N..N.N.NNN.NN.....•NN.......NN.N.N..N N...66-Up Points
Facilities having a rating of one through four points. Inclusive. do not regtrlre a certified operator.
Facilities having an activated sludge process wtl be assigned a minimum classification of Class 11.
Facilities having treatment processes for the removal of metal or cyanide will be assigned a minimum classification of Class II.
Facilities having treatment processes for the biological removal of phosphorus will be assigned a minimum classification of Class M.
.0004 DEFVNtTIONS
The following definitions shall apply throughout this Subchapter.
(1) Activated Carbon Beds. A physlcaVchemical method for reducing soluble organic material from wastewater effluent; The column -type beds used In this
method will have a flow rate varying from two to eight gallons per minute per square foot and may be slther upf ow or downflow carbon beds. Carbon may or
may not be regenerated on the wastewater treatment plant she;
(2) Aerated Lagoons. A basin in which all solids are maintained in suspension and by which biological oxidation or organic matter is reduced through astificialiy
accelerated transfer of oxygen on a flow -through basis;
(3) Aeration A process of bringing about Intimate contact between sir or high purity oxygen In a liquid by spraying. agitation or dffusbn (3a) Extended
Aeration. An activated sludge process utilizing a minimum hydraulic detention time of 18 hours.
(4) Agriculturally managed site. Any site on which a crop Is produced. managed. and harvested (Crop includes grasses. grains. trees. etc-):
(5) Alt Stripping. A process by which the ammonium ion Is first converted to dissolved ammonia (pH adjustment) with the ammonia then released to the
atmosphere by physical means; or other similar processes which remove petroleum products such as benzene. toluene. and xylem;
(6) Carbon Regeneration The regeneration of exhausted carbon by the use of a furnace to provide extremely Ngh terrperatures which volatilize and oxidize the
absorbed impurities;
(7) Carbonaceous Stage. A stage of wastewater treatment designed to acNsve'secondary' affluent limits;
(8) Centrifuge. A mechanical device in which centrifugal force is used to separate solids from liquids or to separate {!quids of different densities;
(9) Chemical Addition Systems- The addition of chsmlcat(s) to wastewater at an application point for purposes of Improving solids removal. pH adjustment.
alkalinity controi. etc.; the capability to experiment with dffererd chemicals and different application points to achieve a specific result will be considered one
system; the capability to add chemical(s) to dual units will be rated as one system; capability to add a chemical at a dhfererd application points for different
purposes will result in the systems being rated as separate systems; •
(10) Chemical Sludge Conditioning. The addition of a chemical compound such as Imo. bntc chloride. or a polymer to net sludge to coalesce the mass prior to
Its application to a dewatering device;
(11) Closed Cysts Systems. Use of holding ponds or holding tanks for containment of wastewater containing inorganic. non -toxic materials from send. gravel.
gushed stone or other similar operations. Such systems shall carry a maximum of two points regardless of pumping facilities or any other appurtenances;
(12) Combined Removal of Carbonaceous SOD and Nitrogenous Removal by Nitrification- A single stage system required to achieve perrdt effluent limits on SOD
and ammonia nitrogen wttNn the same biological reactor
(13) DecNorinatlon TM partial or complete reduction of residual chlorine In a liquid by any cbsmical or physical process;
(14) Donitrtflcatbn Process. The conveabn of nitrate -nitrogen to nitrogen gas;