WQ0002994_Final Permit_19931112

State of North Carolina
Department of Environment,
Health and Natural Resources
Division of Environmental Management
James B. Hunt, Jr., Governor
Jonathan B. Howes, Secretary
A. Preston Howard, Jr., P.E., Director
D E H N R
November 12, 1993
Mr. Rodney M. Tart, Director
Harnett County Department of Public Utilities
Southwest Water & Sewer District of Harnett County
Post Office Box 1119
Lillington, North Carolina. 27456
Subject: Permit No. WQ0002994
Harnett County Dept. of Public Utilities
Carolina Lakes Subdivision Expansion.
Wastewater Treatment System and
Wastewater Spray Irrigation Facilities
Harnett County
Dear Mr. Tart:
In accordance with your application received on June 29, 1993, we are forwarding herewith Permit
No. WQ0002994 dated November 12, 1993, to the Harnett County Department of Public Utilities for the
construction and operation of expanded wastewater treatment and spray irrigation disposal facilities and for
the continued operation of existing treatment facilities. Please note that wastewater flow to this wastewater
treatment plant is restricted; no future sewer extension application will be accepted and/or permitted until
the receiving wastewater treatment plant is expanded and is operational to handle the total wastewater
flows allocated to it plus the proposed sewer extension flow. Please be aware of conditions 11.11 and
I1.12, which specify that construction on the expanded wastewater treatment/disposal facility will be
completed no later than 180 days after September 20, 1993, and that construction will begin within thirty
days after issuance of this permit.
This permit shall be effective from the date of issuance until July 31, 1995, and shall be subject to
the conditions and limitations as specified therein. Please pay particular attention to the monitoring
requirements in this permit. Failure to establish an adequate system for collecting and maintaining the
required operational information will result in future compliance problems. Issuance of this permit hereby
voids Permit No. WQ0002994 issued September 30, 1992.
If any parts, requirements, or limitations contained in this permit are unacceptable to you, you have
the right to request an adjudicatory hearing upon written request within 30 days following receipt of this
permit. This request must be in the form of a written petition, conforming to Chapter 150B of North
Carolina General Statutes, and filed with the Office of Administrative Hearings, P.O. Drawer 27447,
Raleigh, NC 27611-7447- Unless such demands are made this permit shall be final and binding.
P.O. Box 29535, Raleigh, North Carolina 27626-0535 Telephone [phone] FAX [phone]
An Equal Opportunity Affirmative Action Employer 50% recycled/ 10% post -consumer paper

One set of approved plans and specifications is being forwarded to you. if you need additional
information concerning this matter, please contact Mr. John Seymour at 919/ 733-50$3.
Sincerely,
0 �0.§YlqtQp�
A. Pres Howard, Jr., P.E.
cc: Harnett County Health Department
Harnett County Building Inspections Department
Fayetteville Regional Office, Water Quality
Fayetteville Regional Office, Groundwater
Groundwater Section, Jack Floyd
Training and Certification Unit
Bracken & Associates
Facilities Assessment Unit

NORTH CAROLINA
ENVIRONMENTAL MANAGEMENT COMMISSION
DEPARTMENT OF ENVIRONMENT, HEALTH AND NATURAL RESOURCES
RALEIGH
SPRAY IRRIGATION SYSTEM PERMIT
In accordance with the provisions of Article 21 of Chapter 143, General Statutes of North Carolina
as amended, and other applicable Laws, Rules, and Regulations
PERMISSION IS HEREBY GRANTED TO
Southwest Water and Sewer District of Harnett County
Harnett County
FOR THE
construction and operation of new additional treatment facilities and continued operation of existing
treatment facilities having a total capacity of 299,600 GPD consisting of the construction of a 224 foot
wide by 470 foot long by 8 foot deep (219,600 GPD, 30 day treatment) lined facultative pond with an 18
inch gravity effluent line (to the new storage pond), a 115 foot by 400 foot by 18 foot deep (219,600
GPD, 30 day storage) lined storage pond, 8 inch gravity Iines with gate valves connecting the new ponds
to the existing facultative pond; the continued operation of the existing said 2.88 million gallon (80,000
GPD, 30 day treatment) facultative pond, chlorination facilities, a hoiding/filter/pump pond, the pump
station with new 400 GPM dual replacement pumps and existing high water alarms, approximately 11,620
linear feet of 6-inch force main, 10.5 acres of existing spray field having a total of 45 sprinkler heads with
a throw diameter of 145 feet and automatic drain valve for each; construction of a booster spray field pump
station with 400 GPM pump to decrease line pressure in both the existing and new spray fields, 27 acres
of new spray field having a total of 108 sprinkler heads with throw diameter of 145 feet and automatic
drain valve for each (total of 153 sprinkler heads), a new irrigation control system, and all associated
piping, valves, controls, flow meters, and appurtenances; and the continued operation of all existing
associated piping, valves, controls, and appurtenances to serve the equivalent flow of 832 three bedroom
homes (at 120 gallons per bedroom) of the Carolina Lakes Development with no discharge of wastes to the
surface waters, pursuant to the application received June 29, 1993, and in conformity with the project
plan, specifications, and other supporting data subsequently fled and approved by the Department of
Environment, Health and Natural Resources and considered a part of this permit.
This permit shall be effective from the date of issuance until July 31, 1995, and shall be subject to
the following specified conditions and limitations:
I. PERFORMANCE STANDARDS
1. Upon completion of construction and prior to operation of the new treatment and spray
facilities of this permitted treatment system, 'a certification must be received from a
professional engineer certifying that the permitted facility has been installed in accordance
with this permit, the approved plans and specifications. Mail the Certification to the
Permits and Engineering Unit, P.O. Box 29535, Raleigh, NC 27626-0535.

2. The Fayetteville Regional Office, phone no. 919/ 486-1541 shall be notified at least forty-
eight (48) hours in advance of operation of the new installed facilities so that an in -place
inspection can be made. Such notification to the regional supervisor 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.
3. The spray irrigation facilities shall be effectively maintained and operated at all times so
that there is no discharge to the surface waters, nor any contamination of ground waters
which will render them unsatisfactory for normal use. In the event that the facilities fail to
perform satisfactorily, including the creation of nuisance conditions or failure of the
irrigation area to adequately absorb the wastewater, the Permittee shall take such immediate
corrective action to correct the problem, including actions as may be required by the
Division of Environmental Management.
4. The issuance of this permit shall not relieve the Permittee of the responsibility for damages
to surface or groundwaters resulting from the operation of this facility.
5. The sludge generated from these treatment facilities must be disposed of in accordance with
General Statute 143-215.1 and in a manner approved by the North Carolina Division of
Environmental Management.
6. Diversion or bypassing of the untreated wastewater from the treatment facilities is
prohibited.
7. The following buffers shall be maintained:
a) 400 feet between wetted area and any residence or places of public assembly under
separate ownership,
b) 150 feet between wetted area and property lines,
c) 100 feet between wetted area and wells,
d) 100 feet between wetted area and drainageways or surface water bodies,
e) 50 feet between wetted area and public right of ways,
f) 100 feet between wastewater treatment units and wells,
g) 50 feet between wastewater treatment units and property lines.
Some of the buffers specified above may not have been included in previous permits for
this waste treatment and disposal system. These buffers are not intended to prohibit or
prevent modifications, which are required by the Division, to improve performance of the
existing treatment facility. These buffers do, however, apply to modifications of the
treatment and disposal facilities which are for the purpose of increasing the flow that is
tributary to the facility. These buffers do apply to any expansion or modification of the
spray irrigation areas and apply in instances in which the sale of property would cause any
of the buffers now complied with, for the treatment and disposal facilities, to be violated.
The applicant is advised that any modifications to the existing facilities will require a permit
modification.
8. The applicant is required to fill grade, and seed all old internal and perimeter ditches that
were installed as part of a previous erosion control system for the spray irrigation fields.
9. The permittee shall rehabilitate the existing and proposed spray field areas to remove the
vegetation and aerate the soils. A suitable cover crop .shall be established prior to operation
of the expanded facilities.
II. OPERATION AND MAINTENANCE REQUIREMENTS
1. The facilities shall be properly maintained and operated at all times.
2

2. Upon classification of the facility by the Certification Commission, the Permittee shall
employ a certified wastewater treatment plant operator to be in responsible charge (ORC) of
the wastewater treatment facilities. The operator must hold a certificate of the type and
grade at least equivalent to or greater than the classification assigned to the wastewater
treatment facilities by the Certification Commission. The Permitme must also employ a
certified back-up operator of the appropriate type and grade to comply with the conditions
of Title 15A, Chapter 8A, .0202. The ORC of the facility must visit each Class I facility at
least weekly and each Class 11, III, and IV facility at least daily, excluding weekends and
holidays, and must properly manage and document daily operation and maintenance of the
facility and must comply with all other conditions of Title 15A, Chapter 8A, .0202. Once
the facility is classified, the Permittee must submit a letter to the Certification Commission
which designates the operator in responsible charge within thirty days after the wastewater
treatment facilities are 50% complete.
3. A suitable vegetative cover over the spray fields and earthen berms of the new treatment
and storage ponds shall be maintained.
4. Irrigation shall not be performed during inclement weather or when the ground is in a
condition that will cause runoff.
5. Adequate measures shall be taken to prevent wastewater runoff from the spray field.
6. The facilities shall be effectively maintained and operated as a non -discharge system to
prevent the discharge of any wastewater resulting from the operation of this facility.
7. The average annual weekly application rate shall not exceed 2.5 inches per acre at an
instantaneous application rate not to exceed 1.5 inches per hour.
No type of wastewater other than that from Carolina Lakes Development shall be sprayed
onto the irrigation area.
9. No traffic or equipment shall be allowed on the disposal area except while installation
occurs or while normal maintenance is being performed.
10. Public access to the land application sites shall be controlled during active site use. Such
controls may include the posting of signs showing the activities being conducted at each
site.
11. As specified in an agreement which was signed by corporate officials of the Patten
Corporation, the expansion of the wastewater treatment and disposal facilities may be
completed in two stages. The first stage includes the completion of the facility to
accommodate the treatment and disposal of the wastewater from the development of 286
residential lots in Carolina Lakes, Phase VI and 235 residential lots in Carolina Hills, Phase
I and Carolina Lakes, Phase VII. The above referenced expansion of the treatment and
disposal facilities shall be completed within 180 days of the date of the execution of the
agreement, which was no later than September 20, 1993.
12. As specified in a meeting on August 27, 1993, that included officials with the Patten
Corporation and appropriate personnel from the Division of Environmental Management,
the Patten Corporation shall begin construction on the wastewater treatment/disposal facility
expansion (on behalf of Harnett County) within thirty (30) days after issuance of this
permit. `
3

III. MONITORING ,AND REPORTING REQUIREMENTS
1. Any monitoring (including groundwater, surface water, soil or plant tissue analyses)
deemed necessary by the Division of Environmental Management to insure surface and
ground water protection will be established and an acceptable sampling reporting schedule
shall be followed.
2. Adequate records shall be maintained by the Permittee tracking the amount of wastewater
disposed. These records shall include, but are not necessarily limited to the following
information:
a) date of irrigation,
b) volume of wastewater irrigated,
c) field irrigated,
d) length of time field is irrigated,
e) continuous weekly, monthly, and year-to-date hydraulic (inches/acre) loadings for
each field,
f) weather conditions, and
g) maintenance of cover crops.
3. The effluent from the subject facilities shall be monitored by the Permittee at the point prior
to irrigation every February, June, and September for the following parameters:
BOD5 TS S
Fecal Coliform pH
NH3 as N
4. Three copies of all operation and disposal records (as specified in condition III 2) and all
effluent monitoring data (as specified in condition III 3) and any other data as may be
required shall be submitted on or before the last day of the following month to the
following address:
NC Division of Environmental Management
Water Quality Section
Facility Assessment Unit
PO Box 29535
Raleigh, NC 27626-0535
5. Noncompliance Notification:
The Permittee shall report by telephone to the Fayetteville Regional Office, telephone no.
919/ 486-1541 as soon as possible, but in no case more than 24 hours or on the next
working day following the occurrence or first knowledge of the occurrence of any of the
following:
a. Any occurrence at the wastewater treatment facility which results in the treatment of
significant amounts of wastes which are abnormal in quantity or characteristic, such
as the dumping of the contents of a sludge digester, the known passage of a slug of
hazardous substance through the facility; or any other unusual circumstances.
b. Any process unit failure, due to known or unknown reasons, that render the facility
incapable of adequate wastewater treatment such as mechanical or electrical failures
of pumps, aerators, compressors, etc.
CI

IV.
C. Any failure of a pumping station, sewer line, or treatment facility resulting in a by-
pass directly to receiving waters without treatment of all or any portion of the
influent to such station or facility.
d. Any time that self -monitoring information indicates that the facility has gone out of
compliance with its permit limitations.
Persons reporting such occurrences by telephone shall also file a written report in letter
form within 15 days following first knowledge of the occurrence. This report must outline
the actions taken or proposed to be taken to ensure that the problem does not recur.
(IROUNDWATER REQUIREMENTS
1. Within 90 days of permit issuance, six (6) monitor wells shall be constructed in the vicinity
of the spray fields and three (3) wells in the vicinity of the new lagoons to monitor
groundwater quality. The well(s) shall be constructed such that the water level in the well
is never above or below the screened (open) portion of the well at any time during the year.
However, the exact location and construction details for these wells shall be approved by
the Fayetteville Regional Office, from which a well construction permit most be obtained
and shall be constructed in accordance with the conditions of this permit.
2. The nine (9) new monitor wells must be sampled initially after construction for the
parameters listed below. All 13 wells shall continue to be sampled every February, June,
and September for the following parameters:
NO3 TDS
NO2 TOC
Ammonia Nitrogen Chloride
Water Level Fecal Coliforms
pH Total Suspended Solids
Volatile Organic Compounds - In September only ( by
below)
Method 1 or Method 2
Method 1: Method 6230D ( CapiIlary - Column), "Standard Methods for the
Examination of Water and Wastewater", 17th edition, 1989
Method 2: Method 502.2 " Methods for the Determination of Organic Compounds
in Drinking Water", United States Environmental Protection Agency -
600/4-88/039
The measurement of water level must be made prior to sampling for the remaining
parameters. The depth of water in each well shall be measured from the surveyed point on
the top of the casing.
The measuring points (top of well casing) of all monitoring wells shall be surveyed to
provide relative elevations of the measuring point for each of the monitoring wells.
If TOC concentrations greater than 10 mg/l are detected in any downgradient monitoring
well, additional sampling and analysis must be conducted to identify the individual
constituents comprising this TOC concentration: If the TOC concentration as measured in
the background monitor well exceeds 10 mg/1, this concentration will be taken to represent
the naturally occurring TOC concentration. Any exceedances of this naturally occurring
TOC concentration in the downgradient wells shall be subject to the additional sampling
and analysis as described above.
5

If any volatile organic compounds are detected by method 6230D, or the equivalent method
502.2, then EPA methods 604 and 611 must also be run to detect other organic compounds
which may be present. The results of all analysis specified in the monitoring requirements,
including 604 and 611 if required, must be submitted simultaneously.
The results of the sampling and analysis shall be sent to the N.C. Division of
Environmental Management on Form GW-59 (Compliance Monitoring Report Form) every
March, July, and October.
The Compliance Boundary for the disposal system is specified by regulations in 15 NCAC
2L, Groundwater Classifications and Standards.The Compliance Boundary is established
at either (1) 250 feet from the waste disposal area, or (2) 50 feet within the property
boundary, whichever is closest to the waste disposal area. An exceedance of Groundwater
Quality Standards beyond the Compliance Boundary is subject to penalty provisions
applicable under General Statute 143-215.6(a) (1)a.
Also in accordance with 15A NCAC 2L, Groundwater Classifications and Standards. A
REVIEW BOUNDARY is established around disposal systems midway between the
Compliance Boundary and the perimeter of the waste disposal area. Any exceedance of
standards at the Review Boundary shall require remediation action on the part of the
permittee.
4. Any additional groundwater quality monitoring, as deemed necessary by the Division, shall
be provided.
All wells that are constructed for purposes of groundwater monitoring shall be constructed
in accordance with 15A NCAC 2C .0108 (Standards of Construction for Wells Other than
Water Supply) and any other State and local laws and regulations pertaining to well
construction.
6. The Fayetteville Regional Office (telephone number [phone]) shall be notified at
least forty-eight (48) hours prior to the construction of any monitoring well so that an
inspection can be made of the monitoring well location. Such notification to the regional
groundwater supervisor 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.
7. Within sixty (60) days of completion of all monitoring wells, the permittee shall submit two
original copies of a scaled topographic map (scale no greater than I :100) signed and sealed
by a professional engineer or a state licensed land surveyor that indicates all of the
following information:
a. the Iocation and identity of each monitoring well,
b. the location of the waste disposal system,
C. the location of all property boundaries,
d. the latitude and longitude of each monitoring well,
e. the relative elevation of the top of the well casing (which shall be known as
the "measuring point"),
f, and the depth of water below the measuring point at the time the measuring
point is established.
8. Upon completion of all well construction activities, a certification must be received from a
professional engineer certifying that the monitoring wells are Iocated and constructed in
accordance with the Well Construction Standards (15A NCAC 2C) and this permit. This
certification should be submitted with copies of the Well Completion Form (GW-1) for
each well. Mail this certification and the associated GWA forms to the Permits and
Compliance Unit, Groundwater Section, P.O. Box 29535, Raleigh, NC, 27626-0535.
6

9. For the initial sampling of the well as specified elsewhere in the permit, the permittee shall
submit a copy of the GW-1 form with the Compliance Monitoring Form (GW-59) for that
well. Compliance Monitoring Forms that do not include copies of the GW-1 form will be
returned to the permittee without being processed. Failure to submit these forms as required
by this permit may result in the initiation of enforcement activities pursuant to NC General
Statutes 143-215.6.
V . INSPECTIONS
Adequate inspection, maintenance, and cleaning shall be provided by the Permittee to
insure proper operation of the subject facilities.
2. The Permittee or his designee shall inspect the wastewater treatment and disposal facilities
to prevent malfunctions and deterioration, operator errors and discharges which may cause
or lead to the release of wastes to the environment, a threat to human health, or a nuisance.
The Permittee shall keep an inspection log or summary including at least the date and time
of inspection, observations made, and any maintenance, repairs, or corrective actions
taken by the Permittee. This log of inspections shall be maintained by the Perminee for a
period of three years from the date of the inspection and shall be made available upon
request to the Division of Environmental Management or other permitting authority.
3. Any duly authorized officer, employee, or representative of the Division of Environmental
Management may, upon presentation of credentials, enter and inspect any property,
premises or place on or related to the disposal site and facility at any reasonable time for the
purpose of determining compliance with this permit; may inspect or copy any records that
must be kept under the terms and conditions of this permit; or may obtain samples of
groundwater, surface water, or leachate.
VI. CIENERAL CONDITIONS
1. This permit shall become voidable unless the facilities are constructed in accordance with
the conditions of this permit, the approved plans, specifications, and other supporting data.
2. This permit is effective only with respect to the nature and volume of wastes described in
the application and other supporting data.
3. This permit is not transferable. In the event there is a desire for the facilities to change
ownership, or there is a name change of the Permittee, a formal permit request must be
submitted to the Division of Environmental Management accompanied by an application
fee, documentation from the parties involved, and other supporting materials as may be
appropriate. The approval of this request will be considered on its merits and may or may
not be approved.
4. Failure to abide by the conditions and limitations contained in this permit 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.
5. The issuance of this permit does not preclude the Permittee from complying with any and
all statutes, rules, regulations, or ordinances which may be imposed by other government
agencies (local, state, and federal) which have jurisdiction.
6. A set of approved plans and specifications for the subject project must be retained by the
Permittee for the life of the project.
7

7. The annual administering and compliance fee must be paid by the Permittee within thirty
days after being billed by the Division. Failure to pay the fee accordingly may cause the
Division to initiate action to revoke this permit as specified by 15 NCAC 2H .0205 (c)(4).
S. The Perrnittee, at least six (b) months prior to the expiration of this permit, shall request its
extension. Upon receipt of the request, the Commission will review the adequacy of the
facilities described therein, and if warranted, will extend the permit for such period of time
and under such conditions and limitations as it may deem appropriate.
9. Issuance of this permit hereby voids Permit No. WQ0002994 issued September 30, 1992.
Permit issued this the 12th day of November, 1993
NORTH CAROLINA ENVIRONMENTAL MANAGEMENT COMMISSION
o1 , eo,�:_sa A81
A. Preston*ward, Jr., PI., Director
Division of Environmental Management
By Authority of the Environmental Management Commission
Permit Number WQ0002994
P

Permit No. WQ0002994
November 12, 1993
Engineer's Certification
I, , as a duly registered Professional Engineer in the State of North
Carolina, having been authorized to observe (periodically, weekly, full time) the construction of the
project, , for the
Project Name Location
Pezmittee hereby state that, to the best of my abilities, due care and diligence was used in the observation
of the construction such that the construction was observed to be built within substantial compliance and
intent of the approved plans and specifications.
Signature
Date
9
Registration No.

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RATING SCALE FOR CLASSIFICATION OF FACILITIES
ITEM
In
(2)
(3)
Name of Plant: 5.v✓ AliA e r W-i 5 f AP,* .
Owner or Contact Person:
Mailing Address:
County, Telephone:
-----Telephone: — — ^---- --57�
NPDES Permit No. NCOO Nondisc. Per- No.LfQ__�af'�
IssueDate: P, 30 y Expiration Dale:
Existing Facility New Facility f �x�R,v�,,✓f
Rated By:.L:� Date: --
Reviewed (Train. & Cert.) Reg. Office
Reviewed (Train. & Cert.) Central Office
ORC Grade
Plant Class: (circle one) I II HI IV Total Points
POINTS
Industrial Pretreatment Units and/or
Industrial Pretreatment Program
(see definition No. 33)
4
DESIGN FLOW OF PLANT IN GPD
(not applicable to non -contaminated coaling waters, sludge
handling facilities for water purification plants, locally
closed cycle systems (del. No. 11). and facilities
consisting only of Item (4) (d) or Items (4) (d) and (11)
(d))
0 20,000..........................
1
20,001 — 50.000..........................
2
50,001 -- 100,000..........................
3
100.001 250.000..........................
4
250,001 — 500,000..........................
500,001-.1,000,00D ..........................
8
1,000,001 -- 2,000,000 ........................
10
2,000,001 (and up) - rate 1 point additional for each
200,000 gpd capacity up to a
maximum of 30
Design Flow (gpd)
PRELIMINARY UNITS (see definition no. 32)
(a) Bar Screens ................................
1
or
(b) Mechanical Screens, Slaft Screens or
Comminuting Devices ........... .............
2
(c} Grit Removal......... ......................
1
or
(d) Mechanical or Aerated Grit Removal ...........
2
(e) Flow Measuring Device .......................
1
or
(1) Instrumented Flow Measurement ..............
2
(9) Preaeraiion................................
2
(h) Infiuent Flow Equalization ................... 2
(i) Grease or Oil Separators - Gravity .......... 2
Mechanical.......... 3
Dissolved Air Flotation. a
il) Prechlorinalion .............................. 5
(4) PRIMARY TREATMENT UNITS
(5) SECONDARY TREATMENT UNITS
(a) Carbonaceous Stage =
(i)Aeralion - High Purity Oxygen System ..'J —20
Diffused Air System ........... 10
Mechanical Air System (fixed,
floating or rotor) ........ . . . . . .
Separate Sludge Reaeration .....
(ii) Trickling Filler
High Rate .................. .
Standard Rate . ............. .
Packed Tower ...............
(iii) Biological Aerated Filler or Aerated
Biological Filter
(iv) Aerated Lagoons ..................... .
(a) Septic Tank (see definition no. 43) .............. 2
(b) Imhoff Tank .................................. 5
(c) Primary Clarifiers ............................ 5
(d) Settling Ponds or Settling Tanks for Inorganic
Non -toxic Materials {sludge handling facilities
for water purification plants, sand, gravel,
stone, and other mining operations except
recreational activities such as gem or goid
mining)............ .......................... 2
(v) P,otaling Biological Contactors ..........
(vi) Sand Filters-
intermitlent biological .... .
recirculating biological .... .
(vii) Stabil:zalion Lagoons ...................
(vui)Clanlier ..............................
(ix) Single stage system for combined
carbonaceous removal of BOD and
nitrogenous removal by nitrification
(see def. No. 12) (Points for this item
have to be in addition to items (5) (a)
(i) through (5) (a) (viii) .................
(x) Nutrient additions to enhance BOD
removal ...............................
(xi) Biological Culture ("Super Bugs') addition
to enhance organic compound removal .....
(b) Nitrogenous Stage
(i) Aeration - High Purity Oxygen System .... .
Diffused Air System ...........
Mechanical Air System (fixed,
floating, or rotor) ...... ......
' Separate Sludge Reaeration .....
(ii) Trickling Filler -
High Rate ..............
Standard Rate ............
Packed Tower............
(iii) Biological Aerated Filler or Aerated
Biological Filler .........................
(iv) Rotating Biological Contactors .. ........
(v) Sand Filler-
intermillenl biological ....... .
recirculating biological ....... .
(v i) Clarifier
8
3
7
5
5
10
10
10
2
5
a
5
5
20
10
a
3
7
5
5
10
10
2
3
5