NC0022900_Staff Report_19970422

t
Parameters Affected
Basis for change(s)
-Proposed
Changed 1.0 MGD limits from
3/4 to 6/6 and 0.5 MGD winter
limit from 1 to 5.
DO
Section Policy
Staff Review and Evaluation
NH3
Section Policy
12/2.2to2 4
NPDES Wastewater Permit
Temp
0500 regs
To SDP for review: 4/22/97
Back from SDP/to region: 6/19/97
FACILITY INFORMATION
Facility
Carolina Water
Service - Sugar Mountain Utilites WWTP
NPDES No.
NCO022900
Design Flow (MGD)
0.5/10
Facility Class
III
STREAM CHARACTERISTICS
Stream Name
Flattop Creek
Stream Class
C
Sub -basin
04-02-01
Drainage Area (m12)
086
S7Q10 (cfs)
03
W7Q10 (cfs)
04
30Q2 (cfs)
06
IWC (%)
72/84
Changes
Parameters Affected
Basis for change(s)
-Proposed
Changed 1.0 MGD limits from
3/4 to 6/6 and 0.5 MGD winter
limit from 1 to 5.
DO
Section Policy
Cha-nged 10 MGD limits from
NH3
Section Policy
12/2.2to2 4
Changed monitoring frequency
at Eff from 3/week to daily
Temp
0500 regs
Compliance Schedule: N/A
Special Condition(s)- Moved Conditions E & F to supplement to the effluent monitoring page
Moved Condition G to a footnote on the effluent monitoring page
If chlorine disinfection is used, dechlorination shall be employed
Permits & Engineering Comments
ALL chlorine detects = 10.0 µg/1, except for one detect at 3 Facility has chlorine and dechlor
facilities.
Facility has chronic tox test and summer ammonia limit of 12 mg/l at 0 5 MGD At expansion to
1.0 MGD, NH3 limits of 2/4 and tox test All tox tests are Pass since 1/93 Matt Matthews,
Aquatic Tox, has no problem with dropping tox test
Request RO comment on dropping tox test and/or giving NH3 limits at 0.5 MGD of 2/4.
Recommend renewal of NPDES permit with the above changes
Prepared by _ irf
Regional Office Evaluation and Recommendations:
-*I

NC0022900
CWS - Sugar Mountain WWTP
Flattop Creek C 8-22-2 5/15/63
From Source to Elk River
Residual Chlorine
Ammonia as NH3
(summer)
7010 (CFS)
03
7Q10 (CFS)
03
DESIGN FLOW (MGD)
05
DESIGN FLOW (MGD)
05
DESIGN FLOW (CFS)
0 775
DESIGN FLOW (CFS)
0 775
STREAM STD (UG/L)
170
STREAM STD (MG/L)
1 0
UPS BACKGROUND LEVE
0
UPS BACKGROUND LEVI
022
IWC (%)
7209
IWC (%)
7209
Allowable Concentration (
2358
Allowable Concentration
1 30
Ammonia as NH3
(winter)
7Q10 (CFS)
04
Fecal Limit
200/100ml
DESIGN FLOW (MGD)
05
Ratio of 0 4 1
DESIGN FLOW (CFS)
0 775
STREAM STD (MG/L)
1 8
UPS BACKGROUND LEVI
022
IWC (%)
6596
Allowable Concentration
262

NC0022900
CWS - Sugar Mountain WWTP
Flattop Creek C 8-22-2 5/15/63
From Source to Elk River
Residual Chlorine
Ammonia as NH3
(summer)
7Q10 (CFS)
03
7Q10 (CFS)
03
DESIGN FLOW (MGD)
1
DESIGN FLOW (MGD)
1
DESIGN FLOW (CFS)
1 55
DESIGN FLOW (CFS)
1 55
STREAM STD (UG/L)
170
STREAM STD (MG/L)
1 0
UPS BACKGROUND LEVE
0
UPS BACKGROUND LEVI
022
IWC (%)
8378
IWC (%)
8378
Allowable Concentration (
20.29
Allowable Concentration
1.15
Ammonia as NH3
(winter)
7Q10 (CFS)
04
Fecal Limit
200/100ml
DESIGN FLOW (MGD)
1
Ratio of 0 2 1
DESIGN FLOW (CFS)
1 55
STREAM STD (MG/L)
1 8
UPS BACKGROUND LEVE
022
IWC (%)
7949
Allowable Concentration
221
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State of North Carolina
Department of Environment
and Natural Resources
Division of Water Quality
James B. Hunt, Jr., Governor
Wayne McDevitt, Secretary
A. Preston Howard, Jr., P.E., Director
September 29,1997
Mr Carl Daniel
Carolina Water Service, Inc.
P.O Box 240705
Charlotte, North Carolina 28224
A4
WL
EDEHNFI
Subject NPDES Permit Issuance
Permit No. NCO022900
Sugar Mountain WWTP
Avery County
Dear Mr. Daniel.
In accordance with the application for a discharge permit received on April 2,1997, the Division is forwarding
herewith the subject NPDES permit. This permit is issued pursuant to the requirements of North Carolina General Statute 143-
2151 and the Memorandum of Agreement between North Carolina and the US Environmental Protection Agency dated
December 6,1983.
Summarized changes to the permit are:
• A footnote which requires monitoring for Total Residual Chlorine (if it is used).
• Effluent temperature monitoring has changed from 3 tunes per week to daily
• The Chronic Toxicity testing requirement has been retained at the 0.05 MGD flow
• The NH3 limits are the same as they were in the previous permit at the 1.0 MGD flow.
• The Dissolved Oxygen minimum requirement has changed to 6 0 mg/1(summer) and 5.0 mg/1(winter).
If any parts, measurement frequencies or sampling requirements contained in this permit are unacceptable to you, you
have the right to an adjudicatory hearing upon written request within thirty (30) days following receipt of this letter. This
request must be in the form of a written petition, conforming to Chapter 150B of the North Carolina General Statutes, and filed
with the Office of Administrative Hearings, Post Office Drawer 27447, Raleigh, North Carolina 27611-7447 Unless such
demand is made, this decision shall be final and binding
Please take notice this permit is not transferable. Part Il, EA. addresses the requirements to be followed in case of
change in ownership or control of this discharge This permit does not affect the legal requirements to obtain other permits
which may be required by the Division of Water Quality or permits required by the Division of Land Resources, Coastal Area
Management Act or any other Federal or Local governmental permit that may be required
If you have any questions concerning this permit, please contact Mary Cabe at telephone number [phone],
extension 518.
Sincerely,
Original Signed BY
David A. Goodrich
A. Preston Howard, Jr., P.E.
cc: Central Files
Asheville Regional Office, Water Quality Section
Mr. Roosevelt Childress, EPA
NPDES Unit
Compliance Enforcement Unit
Aquatic Toxicology Unit
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

Permit No. NCO022900
STATE OF NORTH CAROLINA
DEPARTMENT OF ENVIRONMENT, HEALTH, AND NATURAL RESOURCES
DIVISION OF WATER QUALITY
PERMIT
TO DISCHARGE WASTEWATER UNDER THE
NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM
In compliance with the provision of North Carolina General Statute 143-215.1,
other lawful standards and regulations promulgated and adopted by the North Carolina
Environmental Management Commission, and the Federal Water Pollution Control Act, as
amended,
Carolina Water Service, Inc. of NC
is hereby authorized to discharge wastewater from a facility located at
Sugar Mountain Utilities
NCSR 1340
south of Banner Elk
Avery County
to receiving waters designated as Flattop Creek in the Watauga River Basin
in accordance with effluent limitations, monitoring requirements, and other conditions set forth in
Parts I, II, III, and IV hereof.
This permit shall become effective November 1, 1997.
This permit and authorization to discharge shall expire at midnight on September 30, 2002.
Signed this day September 29, 1997.
Original Signed By
David A. Goodrich
A. Preston Howard, Jr., P.E., Director
Division of Water Quality
By Authority of the Environmental Management Commission

Permit No. NC0022900
SUPPLEMENT TO PERMIT COVER SHEET
Carolina Water Service, Inc. of NC
is hereby authorized to:
1. Continue to operate an existing 0.5 MGD extended air package plant with aeration, clarifier,
sludge holding, filtration, disinfection, sulfur dioxide dechlorination, and sludge press located at
Sugar Mountain Utilities, NCSR 1340, south of Banner Elk, Avery County (See Part III of this
Permit), and
2. After receiving an Authorization to Construct from the Division of Water Quality, construct the
necessary facilities to increase plant capacity to 1.0 MGD, and
3. Discharge from said treatment works at the location specified on the attached map into Flattop
Creek which is classified Class C waters in the Watauga River Basin.

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N
ROAD CLASSIFICATION
PRIMARY HIGHWAY LIGHT-DUTY ROAD, HARD OR
HARD SURFACE ® IMPROVED SURFACE
SECONDARY HIGHWAY
HARD SURFACE UNIMPROVED ROAD
Latitude: 36008'10" Longitude: 81051-04"
Map # C11 NE Sub -basin 040201
Stream Class C
Discharge Class 06 -Domestic
Receiving Stream Flattop Creek
Permit exp. 09/30/2002 QW 0.05/ 1.0 MGD
SCALE 1:24 000
QUAD LOCATION Carolina Water Service
Sugar Mountain
' NCO022900
Avery County

A. (). EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS FINAL Permit No. NCO022900
During the period beginning on the effective date of the permit and lasting UNTIL EXPANSION ABOVE 0.5 MGD OR EXPIRATION, the
Permittee is authorized to discharge from outfall serial number 001. Such discharges shall be limited and monitored by the permittee as
specified below:
Effluent Characteristics
Flow
BOD, 5 day, 20°C
Total Suspended Residue
Dissolved Oxygen"
Fecal Coliform (geometric mean)
Total Residual Chlonne***
Total Nitrogen (NO2 + NO3 + TKN)
Total Phosphorus
Conductivity
NH3 as N (Apr. 1 - Oct. 31)
NH3 as N (Nov. 1 - Mar. 31)
Temperature °C
Temperature °C
Chronic Toxicity****
Discharge Limitations
Monitoring
Requirements
Measurement
Sample
*Sample
Monthly Avg. Weekly Avg.
Daily Max
Frequency
Type
Location
0.5 MGD
Continuous
Recording
I or E
30 0 mg/I
45 0 mg/I
3/Week
Composite
E
30 0 mg/I
45 0 mg/I
3/Week
Composite
E
3/Week
Grab
E, U, D
200/100 ml
400 /100 ml
3/Week
Grab
E, U, D
24 gg/I
3/Week
Grab
E
Semi-annually
Composite
E
Semi-annually
Composite
E
3/Week
Grab
U, D
12.0 mg/I
3/Week
Composite
E
3/Week
Composite
E
Daily
Grab
E
3/Week
Grab
U, D
Quarterly
Composite
E
* Sample locations: E - Effluent, I - Influent, U - Upstream 100 feet, D - Downstream at NC Highway 194
Upstream and downstream sampling are to be performed 3/week during the months of June, July, August, and September, and once/week
during the rest of the year.
** The daily average dissolved oxygen effluent concentration shall not be less than 6.0 mg/I from April 1 - Oct. 31 and not less than 5.0 mg/I
from Nov. 1 - March 31.
*** If chlorine disinfection is used, dechlorination shall be employed.
**** Chronic Toxicity (Ceriodaphnia) P/F at 72%, April, July, October, and January; See Supplement to Effluent limits page A(1).
The pH shall not be less than 6.0 standard units nor greater than 9.0 standard units and shall be monitored 3/week at the effluent by grab
sample.

A. (). EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS FINAL Permit No. NCO022900
During the period beginning ON THE EFFECTIVE DATE OF EXPANSION ABOVE 0.5 MGD and lasting until expiration, the Permittee is
authorized to discharge from outfall(s) serial number 001. Such discharges shall be limited and monitored by the permittee as specified below -
Effluent Characteristics
Flow
BOD, 5 day, 20°C
Total Suspended Residue
Dissolved Oxygen"
Fecal Coliform (geometric mean)
Total Residual Chlorine`'
Total Nitrogen (NO2 + NO3 + TKN)
Total Phosphorus
Conductivity
Lead
Chronic Toxicity""
NH3 as N (Apr. 1 - Oct. 31)
NH3 as N (Nov. 1 - Mar. 31)
Temperature OC
Temperature °C
Discharge Limitations
Monitoring)
Requirements
Measurement
Sample
'Sample
Monthly Avg. Weekly Avg.
Daily Max
Frequency
Type
Location
1.0 MGD
Continuous
Recording
I or E
30.0 mg/I
45.0 mg/I
3/Week
Composite
E
30.0 mg/I
45 0 mg/I
3/Week
Composite
E
3/Week
Grab
E, U, D
200/100 ml
400 /100 ml
3/Week
Grab
E, U, D
20 gg/I
3/Week
Grab
E
Quarterly
Composite
E
Quarterly
Composite
E
3/Week
Grab
U, D
Monthly
Composite
E
Quarterly
Composite
E
1 2 mg/I
3/Week
Composite
E
2 2 mg/I
3/Week
Composite
E
Daily
Grab
E
3/Week
Grab
U, D
* Sample locations: E - Effluent, I - Influent, U - Upstream 100 feet, D - Downstream on Elk River @ NC Highway 194
Upstream and downstream sampling are to be performed 3/week during the months of June, July, August, and September, and once/week
during the rest of the year.
** The daily average dissolved oxygen effluent concentration shall not be less than 6.0 mg/l from April 1 - Oct. 31 and not less than 5.0 mg/l
from Nov. 1 - March 31.
*** If chlorine disinfection is used, dechlorination shall be employed.
**** Chronic Toxicity (Ceriodaphnia) P/F at 84%, April, July, October, and January; See Supplement to Effluent limits page A(2).
The pH shall not be less than 6.0 standard units nor greater than 9.0 standard units and shall be monitored 3/week at the effluent by grab
sample.

Permit No. NCO022900
SUPPLEMENT TO EFFLUENT LIMITATIONS
AND MONITORING REQUIREMENTS
SPECIAL CONDITIONS
A(1). CHRONIC TOXICITY PASS/FAIL PERMIT LIMIT (QRTRLY)
Until expansion above 0.5 MGD
The effluent discharge shall at no time exhibit chronic toxicity using test procedures outlined in the
"North Carolina Ceriodaphnia Chronic Effluent Bioassay Procedure," Revised November 1995,
or subsequent versions.
The effluent concentration at which there may be no observable inhibition of reproduction or
significant mortality is 72.0% (defined as treatment two in the procedure document). The permit
holder shall perform quarterly monitoring using this procedure to establish compliance with the
permit condition. The tests will be performed during the months of April, July, October, and
January. Effluent sampling for this testing shall be performed at the NPDES permitted final
effluent discharge below all treatment processes.
All toxicity testing results required as part of this permit condition will be entered on the Effluent
Discharge Monitoring Form (MR -1) for the month in which it was performed, using the parameter
code TGP3B. Additionally, DWQ Form AT -1 (original) is to be sent to the following address:
Attention: Environmental Sciences Branch
North Carolina Division of Water Quality
4401 Reedy Creek Road
Raleigh, North Carolina 27607
Test data shall be complete and accurate and include all supporting chemical/physical measurements
performed in association with the toxicity tests, as well as all dose/response data. Total residual
chlorine of the effluent toxicity sample must be measured and reported if chlorine is employed for
disinfection of the waste stream.
Should there be no discharge of flow from the facility during a month in which toxicity monitoring
is required, the permittee will complete the information located at the top of the aquatic toxicity
(AT) test form indicating the facility name, permit number, pipe number, county, and the
month/year of the report with the notation of "No Flow" in the comment area of the form. The
report shall be submitted to the Environmental Sciences Branch at the address cited above.
Should any single quarterly monitoring indicate a failure to meet specified limits, then monthly
monitoring will begin immediately until such time that a single test is passed. Upon passing, this
monthly test requirement will revert to quarterly in the months specified above.
Should the permittee fail to monitor during a month in which toxicity monitoring is required, then
monthly monitoring will begin immediately until such time that a single test is passed. Upon
passing, this monthly test requirement will revert to quarterly in the months specified above.
Should any test data from this monitoring requirement or tests performed by the North Carolina
Division of Water Quality indicate potential impacts to the receiving stream, this permit may be re-
opened and modified to include alternate monitoring requirements or limits.
NOTE: Failure to achieve test conditions as specified in the cited document, such as minimum
control organism survival, minimum control organism reproduction, and appropriate
environmental controls, shall constitute an invalid test and will require immediate follow-up testing
to be completed no later than the last day of the month following the month of the initial
monitoring.
QCL PIF Version 9196

lu
Permit No NCO022900
SUPPLEMENT TO EFFLUENT LIMITATIONS
AND MONITORING REQUIREMENTS
SPECIAL CONDITIONS
A(2). CHRONIC TOXICITY PASS/FAIL PERMIT LIMIT (QRTRLY)
Upon expansion above 0.5 MGD
The effluent discharge shall at no time exhibit chronic toxicity using test procedures outlined in the
"North Carolina Ceriodaphnia Chronic Effluent Bioassay Procedure," Revised November 1995,
or subsequent versions.
The effluent concentration at which there may be no observable inhibition of reproduction or
significant mortality is 84.0% (defined as treatment two in the procedure document). The permit
holder shall perform quarterly monitoring using this procedure to establish compliance with the
permit condition. The tests will be performed during the months of April, July, October, and
January. Effluent sampling for this testing shall be performed at the NPDES permitted final
effluent discharge below all treatment processes.
All toxicity testing results required as part of this permit condition will be entered on the Effluent
Discharge Monitoring Form (MR -1) for the month in which it was performed, using the parameter
code TGP3B. Additionally, DWQ Form AT -1 (original) is to be sent to the following address:
Attention: Environmental Sciences Branch
North Carolina Division of Water Quality
4401 Reedy Creek Road
Raleigh, North Carolina 27607
Test data shall be complete and accurate and include all supporting chemical/physical measurements
performed in association with the toxicity tests, as well as all dose/response data. Total residual
chlorine of the effluent toxicity sample must be measured and reported if chlorine is employed for
disinfection of the waste stream.
Should there be no discharge of flow from the facility during a month in which toxicity monitoring
is required, the permittee will complete the information located at the top of the aquatic toxicity
(AT) test form indicating the facility name, permit number, pipe number, county, and the
month/year of the report with the notation of "No Flow" in the comment area of the form. The
report shall be submitted to the Environmental Sciences Branch at the address cited above.
Should any single quarterly monitoring indicate a failure to meet specified limits, then monthly
monitoring will begin immediately until such time that a single test is passed. Upon passing, this
monthly test requirement will revert to quarterly in the months specified above.
Should the permittee fail to monitor during a month in which toxicity monitoring is required, then
monthly monitoring will begin immediately until such time that a single test is passed. Upon
passing, this monthly test requirement will revert to quarterly in the months specified above.
Should any test data from this monitoring requirement or tests performed by the North Carolina
Division of Water Quality indicate potential impacts to the receiving stream, this permit may be re-
opened and modified to include alternate monitoring requirements or limits.
NOTE: Failure to achieve test conditions as specified in the cited document, such as minimum
control organism survival, minimum control organism reproduction, and appropriate
environmental controls, shall constitute an invalid test and will require immediate follow-up testing
to be completed no later than the last day of the month following the month of the initial
monitoring.
QCL PIF Version 9196