NC0026646_Permit (Issuance)_19990707

NPDES DOCUMENT SCANNING COVER SHEET
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NC0026646
Pilot Mountain WWTP
NPDES Permit:
Document Type:
Permit Issuance
Wasteload Allocation
Authorization to Construct (AtC)
Permit Modification
Complete File - Historical
Engineering Alternatives (EAA)
Correspondence
Owner Name Change
Instream Assessment (67b)
Speculative Limits
Environmental Assessment (EA)
Document Date:
July 7, 1999
This document is printed on reuse paper - ignore any
content on the reizerse side

State of North Carolina
Department of Environment
and Natural Resources
Division of Water Quality
James B. Hunt, Jr., Governor
Wayne McDevitt, Secretary
Kerr T. Stevens, Director
July 7, 1999
Mr. Billy T. Pell
Town Manager
Post Office Drawer AA
Pilot Mountain, North Carolina 27041
Dear Mr. Pell:
AVA
NCDENR
NORTH CAROLINA DEPARTMENT OF
ENVIRONMENT AND NATURAL RESOURCES
Subject: Final NPDES Permit
Permit No. NC0026646
Town of Pilot Mountain WWTP
Surry County
In accordance with the application for a discharge permit received on December 2, 1998, the Division is
forwarding herewith the subject NPDES permit. This permit is issued pursuant to the requirements of
North Carolina General Statute 143-215.1 and the Memorandum of Agreement between North Carolina
and the U.S. Environmental Protection Agency dated December 6, 1983, and as subsequently amended.
Please note the following changes from the previous permit (as indicated in the draft) have been finalized:
• Limits for Cadmium (Cd) and Cyanide (CN) have changed. Because data indicate there is
reasonable potential to exceed allowable concentrations based on acute water quality criteria, the
limits have been modified. Monitoring must still be performed weekly, consistent with other Class
III facilities.
• In light of information available regarding CN measurement techniques, the Division feels it is
reasonable to specify the quantitation level for CN as 10 14/1. CN levels reported as "<10 14/1"
will be considered zero for compliance purposes. This information is footnoted on the effluent pages.
• Monitoring requirements for Arsenic (As) and Selenium (Se) have been removed. Because the
facility already monitors these parameters as part of its Long -Term Monitoring Plan (LTMP),
monitoring requirements are not necessary in the NPDES discharge permit.
• Weekly monitoring for Total Nitrogen and Phosphorus has been added. This change is consistent
with an effort to gather more data about nutrient loading in this portion of the watershed.
• Chronic Toxicity monitoring must be performed concurrently with metals, cyanide, and zinc
monitoring. This change will ensure Whole Effluent Toxicity (WET) ,data may be compared with
toxicant data.
Optimizing Phosphorus Removal
This facility is located in a watershed draining to High Rock Lake, where high phosphorus loading has
been documented by numerous studies. The Yadkin -Pee Dee River Basinwide Water Quality
Management Plan recommends that dischargers in the High Rock Lake watershed conduct evaluations of
existing facilities and optimize phosphorus removal to the extent practicable during the next permit cycle.
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

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 note that this permit is not transferable. Part II, E. 4. 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 Land Resources or any
other Federal or Local governmental permit that may be required.
If you have any questions or comments concerning this permit, please contact Charles Weaver at (919)
733-5083, extension 511.
Sincerely,
Original Signed By
David A. Goodrich
Kerr T. Stevens
Enclosure
cc: Central Files
Winston-Salem Regional Office/Water Quality Section
Aquatic Toxicology Unit
NPDES Unit
Mr. Roosevelt Childress, EPA
Point Source Compliance Enforcement Unit

Permit No. NC0026646
STATE OF NORTH CAROLINA
DEPARTMENT OF ENVIRONMENT 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,
Town of Pilot Mountain
is hereby authorized to discharge wastewater from a facility located at
Pilot Mountain Wastewater Treatment Plant (WWTP)
on Lynchburg Road
near r Pilot Mountain
Surry County
to receiving waters designated as the Ararat River in the Yadkin -Pee Dee 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 August 1, 1999.
This permit and authorization to discharge shall expire at midnight on February 29, 2004.
Signed this day July 7, 1999.
Original Signed By
David A. Goodrich
Kerr T. Stevens, Director
Division of Water Quality
By Authority of the Environmental Management Commission

SUPPLEMENT TO PERMIT COVER SHEET
Town of Pilot Mountain
is hereby authorized to:
Permit No. NC0026646
1. Continue to operate an existing 1.5 MGD extended aeration facility consisting of an
influent pump station, oxidation ditch, two clarifiers, chlorination, step reaeration, and
an aerated sludge holding unit, located at Town of Pilot Mountain Wastewater
Treatment Plant (WWTP), on Lynchburg Road, near Pilot Mountain, Surry County,
and
2. After receiving an Authorization to Construct (ATC) from the Division of Water
Quality for the necessary expansion/upgrade of the facility, operate a 3.0 MGD
wastewater treatment system, and
3. Discharge from said treatment works at the location specified on the attached map
into the Ararat River, which is classified as C waters in the Yadkin -Pee Dee River
Basin.

Latitude: 36'22' 46'
Longitude: 86'28' 54"
Quad B16SE
Receiving Steam Ararat River

A(1). EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS
Permit No. N00026648
During the period beginning upon the effective date of the permit and lasting until expansion above 1.5 MGD or expiration, the Permittee is authorized to discharge domestic
ater from outfall(s) serial number 001. Such discharges shall be limited and monitored by the Permittee as specified below:
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1.5 MGD
Continuous
Recording
I or E
_BOD, 5-day, 20°C2
30.0 mg/I
45.0 mg/I
3/week
Composite
E,I
TSS2
30.0 mg/I
45.0 mg/I
3/week
Composite
E,l
NH3-N (April 1 - October 31)
28.6 mg/I
3/week
Composite
E
NH3-N (November 1 - March 31)
3/week
Composite
E
Dissolved Oxygen3
3/week
Grab
E,U,D7
Fecal Coliform (geometric mean)
200/100 ml
400/100 ml
3/week
Grab
E,U,D7
Temperature
Daily
Grab
E
Temperature
3/week
Grab
U,D7
Total Residual Chlorine
3/week
Grab
E
Conductivity
3/week
Grab
U,D7
Oil and Grease
3/week
Grab
E
Total Nitrogen (NO2+ NO3 + TKN)
Weekly
Composite
E
-Total Phosphorus
Weekly
Composite
E
pH4
3/Week
Grab
E
Chronic Toxicity5
Quarterly
_ Composite
E
Cadmium
5 µg/1
Weekly
Composite
E
Cyanides
22 µg/i
Weekly
Grab
E
Copper
2/month
Composite
E
Silver
2/month
Composite
E
Zinc
2/month
Composite
E
Notes:
Sample locations: E - Effluent, I - Influent, U - Upstream at least 100 feet above outfall, D - Downstream approximately 0.4 miles at NCSR 2044. Instream
monitoring shall be grab samples collected 3lwk (Jun -Sep) and llwk (Oct -May).
2 The monthly average effluent BODS and Total Suspended Solids concentrations shall not exceed 15% of the respective influent value (85% removal).
3 The daily average dissolved oxygen effluent concentration shall not be less than 5.0 mg/I.
4 The pH shall not be less than 6.0 standard units nor greater than 9.0 standard units.
s Chronic Toxicity (Ceriodaphnia), P/F, no significant mortality at 3 %; January, April, July, and October; See Supplement to Effluent Limitations and Monitoring
Requirements Page A(3).- Special Conditions for flow of 1.5 MGD. TOXICITY MONITORING MUST BE PERFORMED IN CONJUNCTION WITH METALS, CYANIDE,
AND ZINC MONITORING.
6 The quantitation level for cyanide (CN) shall be 10 nil. CN levels reported as "<10 µg/l" shall be considered zero for compliance purposes.
7 Instream monitoring is waived as long as this facility is a member of the Yadkin -Pee Dee River Basin Association. If the facility ends Its membership In the
Yadkin -Pee Dee River Association, instream monitoring requirements as specified in this permit take effect Immediately.
There shall be no discharge of floating solids or visible foam in other than trace amounts.

A(2). EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS •
Permit No. NC0028G46
During the period beginning upon expansion above 1.5 MGD and lasting until expiration, the Permittee is authorized to discharge domestic and industrial
wastewater from outfall(s) serial number 001. Such discharges shall be limited and monitored by the Permittee as specified below:
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Flow
3.0 MGD
Continuous
Recording
.
I or E
BOD, 5-day, 20°C2
30.0 mg/I
45.0 mg/l
3/week
Composite
E,I
TSS2
30.0 mg/i
45.0 mg/l
3/week
Composite
E,1
NH3-N (April 1 - October 31)
15.0 mg/i
3lweek
Composite
E
NH3-N (November 1 - March 31)
3/week
Composite
E
Dissolved Oxygen3
3/week
Grab
E,U,D7
Fecal Coliform (geometric mean)
200/100 mi
400/100 ml
3/week
Grab
E,U,D7
Temperature
Daily
Grab
E
Temperature
3/week
Grab
U,D7
Total Residual Chlorine
28 µg/i
3/week
Grab
E
Conductivity
3/week
Grab
U,D7
Oil and Grease
3/week
Grab
E
Total Nitrogen (NO2+ NO3 + TKN)
Monthly
Composite
E
Total Phosphorus
Monthly
Composite
E
pH4
3/Week
Grab
E
Chronic Toxicity5
Quarterly
Composite
E
Cadmium
5 µg/i
Weekly
Composite
E
Cyanides
22 µg/i
Weekly
Grab
E
Copper
2/month
Composite
E
Silver
2/month
Composite
E
Zinc
2/month
Composite
E
Notes:
t Sample locations: E - Effluent, I - Influent, U - Upstream at least 100 feet above outfall, D - Downstream approximately 0.4 miles at NCSR 2044. Instream
monitoring shall be grab samples collected 3/wk (Jun -Sep) and 11wk (Oct -May).
2 The monthly average effluent BOD5 and Total Suspended Solids concentrations shall not exceed 15% of the respective influent value (85% removal).
3 The daily average dissolved oxygen effluent concentration shall not be less than 5.0 mg/i.
4 The pH shall not be less than 6.0 standard units nor greater than 9.0 standard units.
5 Chronic Toxicity (Ceriodaphnia), P/F, no significant mortality at 5 %; January, April, July, and October; See Supplement to Effluent Limitations and Monitoring
Requirements Page A(4).- Special Conditions for flow of 3.0 MGD. TOXICITY MONITORING MUST BE PERFORMED IN CONJUNCTION WITH METALS, CYANIDE,
AND ZINC MONITORING.
6 The quantitation level for cyanide (CN) shall be 10 µg/l. CN levels reported as °<10 µgll" shall be considered zero for compliance purposes.
7 Instream monitoring is waived as long as this facility is a member of the Yadkin -Pee Dee River Basin Association. If the facility ends its membership In the
Yadkin -Pee Dee River Association, instream monitoring requirements as specified In this permit take effect immediately.
There shall be no discharge of floating solids or visible foam in other than trace amounts.

Permit No. NC0026646
SUPPLEMENT TO EFFLUENT LIMITATIONS
AND MONITORING REQUIREMENTS
SPECIAL CONDITIONS
A (3). CHRONIC TOXICITY PASS/FAIL PERMIT LIMIT (QRTRLY)-1.5 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 3 % (defined as treatment two in the procedure document). The permit holder shall perform
uarterl monitoring using this procedure to establish compliance with the permit condition. The tests will
ebe performed during the months of January, April, July, and October. 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.

Permit No. NC0026646
SUPPLEMENT TO EFFLUENT LIMITATIONS
AND MONITORING REQUIREMENTS
SPECIAL CONDITIONS
A (4). CHRONIC TOXICITY PASS/FAIL PERMIT LIMIT (QRTRLY) )-3.0 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 5 % (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
ee performed during the months of January, April, July, and October. 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.

NORTH CAROLINA
SURRY COUNTY
AFFIDAVIT OF PUBLICATION
Before the undersigned, a Notary Public of said County and State, duly
commissioned, qualified and authorized by law to administer oaths,
personally appeared Georcre W. Summerlin
who being first duly sworn, deposes and says: that he (she) is
Pith 1 i �h Pr (Publisher or other officer or employee
authorized to make affidavit) of MOUNT AIRY NEWSPAPERS, INC.,
engaged in the publication of a newspaper known as MOUNT AIRY
NEWS, published , issued, and entered as second class mail in the city of
Mount Airy in said County and State; that he (she) is authorized to make
this affidavit and sworn statement; that the notice or other legal
advertisement, a true copy of which is attached hereto, was published in
MOUNT AIRY NEWS on the following dates:
May 19., 1999
and that the said newspaper in which such notice, paper, document or
legal advertisement was published was, at the time of each and every
such publication, a newspaper meeting all of the requirements and
qualifications of Section 1-597 of the General Statutes of North Carolina
and was a qualified newspaper within the meaning of Section 1-597 of
the General Statutes of North Carolina.
This
2'0
day of Mav
Sworn to and subscribed before me, this 2 n
Ma
, 1999
AILL‘
Notary Public
My Commission expires: February 28,
day of
19 99
2002
ChiVi PUBLIC NOTICE •
STATE OF NORTH
• CAROLINA
ENVIRONMENTAL
MANAGEMENT
COMMISSION
POST OFFICE BOX •
RALEIGH; NORTH
'CAROUNA''27626-0535 :r
.NOTIFICATION OF ,.:
INTENTTO ISSUE A ' " -
STATE NPDES PERMIT
On the basis of thorough
staff review and application
of Article _21 of Chapter
143,-General'Statutes of •
North Carolina;. Public Law .
92-500 and , other lawful
standards. and ?regulations,•
the'' North`s Carolina:
Environmental: -
Management `Commission:
proposes to. issue a permit}
to discharge, to. the persons.
listed�•below .effective
07-99 and `subject to spe-
• cial conditions..
Persons. 'wishing to com-
ment upon br'object to the'
proposed; :determinations"
are invited to -submit same..
in writing to the above
address no later than 6-21-
99. All comments received
prior to that date will be
considered in the formula-1
tion of final determinations
regarding.' the proposed i
permit. A public meeting
may be 'held where the J
Director of the Division of
En,vi,r.onmentaim
Management finds a signif: ,
icant degree of public inter- ;
est in a proposed permit.
A copy of the draft permit is sl
available by writing or call-
ing the : Division of '
Envir..on.menta.It
Management , PO BOX
29535. Raleigh NC 27626-
0535, (9;1,9) 7•
33-7015
The application and other
information may be
inspected at these loca-
tions during normal office
hours. Copies of the infor•
-
mation on file are available
upon requests regarding a
proposed permit should
make . reference to the :
NPDES permit number list •
-
ed below.
Date May 12, 1999 `-
David A Goodrich •' •
for Kerr T. Stevens
Director:;_ = - . •
Divisionlof_ Environmental
Management - •
Public ..notice .:of intent,tfi
issue a State NPDES per
mit to the following: ,*
1. NPDES No. NC00- 26646.
Town of Pilot MoUntain;PQ.
Drawer AA,.Pilot Mountain,.
NC 2704thas'appligd.lor a.
permit renewal for 3.1011ity-
located.':at the = Pilot
Mountain WWTP, on
Lynchburg Rd. near Pilot
Mountain in Surry County.
The facility currently dis-
charges
treat-
ed domestic and industrial
ed
waste water from one out -
fall into the Ararat River, a
Class C Stream in the
Yadkin Pee Dee River
Basin which has 7010 flow
of 82..2 cfs:-"Upon expan-
sion. the facility is permit-

aper in which such notice, paper, document or
published was, at the time of each and every
vspaper meeting all of the requirements and
1-597 of the General Statutes of North Carolina
spaper within the meaning of Section 1-597 of
orth Carolina.
day of Mav , 19 9 9
f person making affidavit
3ed before me, this 20 day of
, 19 99
otary Public
res: February 28, 2002
•
99. Atl comments recenreo
prior to that date will be
considered in the formula-
tion of final determinations
regarding the proposed
permit. A public meeting
may be held where the
Director of the Division .of,
Environmental
Management finds a signif-.
icant degree_of public interi.
est in a proposed permit:
A copy of the draft permit is
available by.writing or call-
ing the ;;.Division' of
Enviro'n.men'ta'I
Management , PO BOX
29535, Raleigh NC 27626-
0535, [phone]: ' -
The application and other
information may' be
inspected- at- these- loca=
tions during normal office
hours. Copies of the infor
mation on file are available
upon requests regarding a
proposed permit should
make • reference to the
NPDES permit number list-
ed below. . ; •
Date May 12, 199gh;ic-1ti=
bavid A Goodricli
for Kerr T. Stevens
Director 1:,=
Division of Environmental
Management
r• •: e
Public notice of intent : to
issue a State NPDES per
mit to the following:-
1. NPDES No. NC0026646.
Town of Pilot Mountain, PO
Drawer AA, Pilot Mountain,
j NC 27041. has applied for a
permit renewal for a facility
located:- 'at the Pilot
I Mountain WWTP,., - on
Lynchburg. Rd, near Pilot
Mountain in Surry County.
The facility currently dis-
i charges_ 1.5 MGD oftreat-
ed domestic and industrial
waste water from one: Out -
fall into the 'Ararat River; a
Class C Stream;?rn the,.
Yadkin Pee Dee _River.
Basin which has7Q10 flow
of 82:2'cfs"Upon"expan- -
sion, the facility.;is. permit-
ted to discharge,5:0 'MGD
from the same dutfell to the
Ararat,River...r. Ammonia,
cyanide, and cadmium are
water,-qua[ity: limited:;nr
some parameters th$ avail-
able . load ,capacity ol.; the
immediate receiving water
will be =consumed-E'•71t1is
may affect .futon '•wafe''
quality based effluent
tations for additional dis=
chargers'within this portion
of the watershed.;`Taite�
.May-191999.�.:.ia :a��

..UPDATE OPTION
NPDES FACILITY AND PERMIT DATA 04/15/99 15:03:17
TRXID 5NU KEY NC0026646
PERSONAL DATA FACILITY APPLYING FOR PERMIT REGION
FACILITY NAME> PILOT MOUNTAIN, TOWN - WWTP COUNTY> SURRY 04
ADDRESS: MAILING (REQUIRED) LOCATION (REQUIRED)
STREET: 126 WEST MAIN STREET STREET: LYNCHBURG ROAD
CITY: PILOT MOUNTAIN ST NC ZIP 27041 CITY: PILOT MOUNTAIN ST NC ZIP 27041
TELEPHONE [phone]
STATE CONTACT> CLARK
1=PROPOSED,2=EXIST
LAT: 3622460 LONG
DATE APP RCVD
DATE STAFF REP REQS
DATE STAFF REP RCVD
DATE TO P NOTICE
DATE OT AG COM REQS
DATE OT AG COM RCVD
DATE TO EPA
DATE FROM EPA
,3=CLOSED
: 08028540
12/02/98
( 22//o' /
/
/ /
DATE FEE PAID: 12/02/98 AMOUNT: 400.00
PERSON IN CHARGE BILLY PELL
2 1=MAJOR,2=MINOR 1 1=MUN,2=NON-MUN 1
N=NEW,M=MODIFICATION,R=REISSUE> R
WASTELOAD REQS / /
WASTELOAD RCVD / /
SCH TO ISSUE / /
DATE DRAFT PREPARED 04/M/99
DATE DENIED / /
DATE RETURNED / /G
DATE ISSUED • /d?/! ASSIGN/CHANGE PERMIT
EXPIRATION DATE• /Lr%/
FEE CODE ( 2 ) 1=(>10MGD),2=(>1MGD),3=(>0.1MGD),4=(<0.1MGD),5=SF,6=(GP25,64,79),
7=(GP49,73)8=(GP76)9=(GP13,34,30,52)0=(NOFEE) DIS/C 01 CONBILL ( )
COMMENTS:
MESSAGE: *** DATA MODIFIED SUCCESSFULLY ***
atc.ftt
5 2/99 5 -(
C' 6-nitAlisA
c
PvSRO r),‘

Staff Review and Evaluation
NPDES Wastewater Permit (NC002664
RECEIVED
C. Dept. of EN-NNfl
MAY 0 4 1999
Facility Information W'n' tOn-Sale '
ficg;on
Facility Name:
Town of Pilot Mountain . 0ff(c�
NPDES No.:
NC0026646
Permitted Flow (MGD):
1.5/3.0
County:
Surry
Facility Class:
III
Regional Office:
Winston-Salem
Facility/Permit Status:
(i.e. New, Modification, Existing or
Renewal)
Renewal
USGS Topo Quad:
B16SE, " Si loam"
Stream Characteristics
Receiving Stream:
Ararat River
303(d) Status:
Listed as Impaired (Partially Supporting)
Stream Classification:
C
Winter 7Q10 (cfs):
163
Subbasin:
03-07-03
30Q2 (cfs):
--
Drainage Area (mi2):
287
Average Flow (cfs):
379
Summer 7Q10 (cfs)
82.2
IWC (%):
3 (1.5 MGD)/5
(3.0 MGD)
Proposed changes:
Location
Proposed Changes
Basis for changes
Effluent Limitations and
Monitoring Requirements
Changed daily maximum limits
for Cd and CN to 5 and 22 mil,
respectively; specified
quantitation level (QL) for CN as
10 µg/1.
Reasonable potential to exceed
FAV (Acute criteria). Policy is
now to include 'A FAV as daily
max. limit and a weekly ave. based
on WQ std. to reflect chronic
criteria, unless 'A FAV is more
stringent (then only daily max. limit
necessary).
Effluent Limitations and
Monitoring Requirements
Monitoring requirements for As
and Se were removed.
Facility monitors these parameters
quarterly as part of the LTMP
Program)
(Pretreatment —data
reported on DMRs. No reasonable
potential to exceed water quality
standards.
Effluent Limitations and
Monitoring Requirements
Footnote added that exempts
facility from instream monitoring
as long as it is a member of the
Yadkin Basin Association.
Letter of exemption from DWQ
dated 6/1/98.
Effluent Limitations and
Monitoring Requirements
Changed monitoring frequencies
for Total Nitrogen and Total
Phosphorus to Weekly.
Per 12/7/98 Memo from Steve
Pellei outlining nutrient monitoring
strategy for Yadkin sub -basins.
Effluent Limitations and
Monitoring Requirements
Chronic Toxicity monitoring
must be performed in
conjunction with toxicant
monitoring (footnoted).
Division policy for facilities
performing WET monitoring.
Allows comparison of future data.
Compliance Schedule: N/A.
1
05/02/99
ASSIGNED IO..e o\ ��Ll).___
DUE DATE .-5'—/g—S 5

-4
Staff Review and Evaluation
NPDES Wastewater Permit (NC0026646)
Special Condition(s): Quarterly Chronic WET P/F @ 3 % at 1.5 MGD and 5 % at 3.0 MGD.
Exempt from instream monitoring as long as facility is member of the
Yadkin -Pee Dee River Association.
Summary:
This permit was last renewed in March, 1998 (see attached fact sheet). A review of the DMR files since
that time indicated facility is performing within limits (see attached notes). According to a 1/12/99 letter
from the Pretreatment Unit, the SIU Armtex closed and moved. This facility had contributed 0.5 MGD,
or 60% of Pilot Mt.'s capacity.
The facility has been delinquent on several occasions with Toxicity Monitoring Reports. Per a phone
conversation with Kevin Bowden at ESB, 3/99 was the fifth time the facility has failed to send in any
WET testing results. The probable cause is personnel problems recently experienced by Pilot Mt.
WWTP. Facility was assessed civil penalties for two of these occasions in 10/98. Region —any
comments on what facility is doing to rectify problem?
Since this portion of the Ararat is impaired, and elevated fecal levels have been observed, instream fecal
monitoring has been retained at this renewal. Conductivity was also retained since this facility accepts
industrial waste. All changes are consistent with North Carolina's Anti -Degradation Policy.
This facility is located in sub -basin 03-07-03, which is in the High Rock Lake watershed. Since High
Rock Lake is impacted by heavy phosphorus loading, the Basinwide plan recommends that dischargers in
this watershed evaluate existing facilities for optimizing phosphorus removal and attempt to minimize
loading discharged. Pilot Mountain currently discharges concentrations of 2-5 mg/1 of total phosphorus.
Proposed Schedule:
Draft Permit to Public Notice: 5/19/99
Permit Scheduled to Issue: 7/7/99
State Contact
If you have any questions on any of the above information or on the attached permit, please
contact Bethany Bolt prior to May 17, 1999 at [phone], extension 551.
Copies of the following are attached to provide further information on the permit development:
• WET Test Results Summary
• Reasonable Potential Calculations
• Permit Writer's Notes
• Existing Permit
• Previous Fact Sheet
NPDES Recommendation by:
Regional Office Comments: day rru rs a * 0 0.J0.i► cd.At -i-o
3 3RO -shc iwJ LQ w-e-dA CiLL bit + a- Ato .Jte-Lp t Ilk_ Pi tot 1-i-r) lWU WTP
taiu,,v so w 01Q, not ho.. ._ (-A0A- 1'+rrvo 1U V+-h
To<i 'm V\C "1
Mt- ftcm inc 1 O
AUY\ W j .
n cCAvVmOtAds alOcU-i- 4a4 'P-UVYnId.
2
05/02/99

Staff Review and Evaluation
NPDES Wastewater Permit (NC0026646)
Regional Recommendation by:
Signature:,
9Min e-C-U\kiRAAIL, 5 -10 - CAC\
Reviewed By:
Regional Supervisor:
Signature:
,0_ 6-
Date:
/(- �5,
NI'DES Unit:
Signature:
4(11-(---.
Date
46/Z'0I c�
3
05/02/99

NOTES FOR PILOT MT. WWTP
PERMIT RENEWAL (NC0026646)
Wastewater discharge from Town of Pilot Mt WWTP (Pilot Mt., Surry County) to
Ararat River in the Yadkin -Pee Dee River Basin.
15A NCAC 2B .0300 Index #: Ararat River classified as C (#12-72-(4.5)) in 8/1/98.
Permit Information:
The previous permit was issued March 2, 1998. See Fact Sheet.
Basinwide Plan Information:
• This sub -basin (03-07-03) contains the Ararat River and its tribs. Macroinvertebrate
sites on the Ararat had Good -Fair bioclassifications in '96. Mt. Airy WWTP and
Pilot Mt. WWTP (moved to river in '96) both discharge to Ararat.
• Nearest ambient station is upstream near confluence with Flat Shoal Cr. Ambient ,
monitoring has documented impacts of point sources; fecal coliform appear to be a
chronic problem at ambient sites, and suspended sediments are also a problem.
The Ararat River regularly has total residue and conductivity values double that of
the Yadkin.
• This section of the Ararat River is impaired (Partially Supporting). Fecal and
turbidity levels exceed the standard, and considerable sedimentation are evident,
and sources are both point and non -point. The old location of Pilot Mt.'s discharge
(.Heatherly Cr) is also impaired (toxicity problems) . Since the facility moved
discharge to the Ararat River,no instream DO violations have been reported.
Instream data from Mt. Airy suggests possible water quality problems pdue to
oxygen -consuming wastes.
• Additional activities/resources are needed to identify causes of impairment in the
Ararat; no management strategies have yet been developed for this waterbody.
DWQ igntends to develop NPS managemenstrategies, as well.
Correspondence:
• 1/12/99 Pretreatment Compliance Inspection report indicated Armtex closed their
plant in '97 and moved. This plant contributed 0.5 MGD, or 60% of the hydraulic
flow.
• 10/28/98 letter assessed a civil penalty ($500) for failure of the facility to submit
toxicity monitoring results in May and June. (Note: Kevin Bowden at ESB contacted
me on 4/15 to check if facility had submitted tox. results— no evidence in DMR files
that theyhad. He said he has had repeatedproblems with obtainingdata from the
facility, due mainly to personnel problems Pilot Mt. has experienced. This is the fifth
time the report has not been received.)
• 8/14/98 approval for Intex Corp. to become an SIU.
• 9/3/98 Compliance Evaluation Inspection issued an NOV for a BOD5 violation in
1/98.
• 6/1/98 letter waived instream monitoring as long as facility is a member of the
Yadkin -Pee Dee River Basin Association.
DMR Review (97--99):
• See reasonable potential for toxicants.
• Discharge averaged 0.8-0.9 MGD in early 1998, then dropped to 0.3-0.5 MGD
through 1999. Ave. BOD5 usually < 10 mg/1; ammonia < 1 mg/l. TRC 1-2 mg/l.

• NC0026646 BAB
TSS < 20 mg/1, fecals normal. DOs well above 6 mg/1, O&G normally < 5 mg/1.
TP usually < 5mg/1, TN fluctuates— 10-30 mg/1, sometimes lower.
• Instream Data: (up to 6/98) DOs and temps fine; no trends observed in
conductivity or fecal.
LTMP Data:
• No reasonable potential to exceed Hg, Cr, Ni, As, Pb, or Se, and these are required
in LTMP, so no monitoring necessary. Limits for Cd and CN can not be
eliminated because data showed reasonable potential to exceed the lh FAV (will be
daily max., based on new policy) .
• One measurement for Pb was treated as an outlier (43 µg/1), since all other
measurements were below detect, so no reasonable potential to exceed. This
parameter is also SIU limited. Since Pb part of LTMP, monitoring will not be
required.
• Standard LTMP parameters (req'd by EPA): Cd, Cr, Cu, Ni, Pb, and Zn.
Parameters per 503 regs (sludge):As, Se, Mo, and Hg. All quarterly
monitoring. Additional parameters dictated by what SIUs discharge to town (e.g.,
CN).
General Comments:
Per Steve Pellei's 12/7/98 Memo regarding nutrient monitoring in the Yadkin
basin, this facility should be given weekly TN and TP monitoring.
Expiration date to be assigned to this permit is February 29, 2004.
page 2

Permit No. NC0026646
STATE OF NORTH CAROLINA
DEPARTMENT OF ENVIRONMENT 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,
Town of Pilot Mountain
is hereby authorized to discharge wastewater from a facility located at
Pilot Mountain Wastewater Treatment Plant
on Lynchburg Road
Near Pilot Mountain
Surry County
to receiving waters designated as Ararat River in the Yadkin -Pee Dee River Basin
in accordance with effluent limitations, monitoring requirements, and other conditions set forth in Parts I,
II, III, and IV hereof.
The permit shall become effective 448r—
•
This permit and the authorization to discharge shall expire at midnight otr itme-30, 19W
-F4b Z-9 zoo 4
Original Signed By
David A. Goodrich
Sinned this day Marc-h-1-995—.
A. Preston Howard, Jr., P.E., Director
Division of Water Quality
By Authority of the Environmental Management Commission

SUPPLEMENT TO PERMIT COVER SHEET
Town of Pilot Mountain
is hereby authorized to:
Permit No. NC0026646
1. Continue to operate an existing 1.5 MGD wastewater treatment system consisting of an
influent pump station, oxidation ditch, two clarifiers, chlorination, step reaeration, and an
aerated sludge holding unit, located at Pilot Mountain WWTP, on Lynchburg Road, near
Pilot Mountain, Surry County (See Part III of this permit), and
2. After receiving an Authorization to Construct for the necessary improvements to
expand/upgrade the facility, operate a 3.0 MGD wastewater treatment system, and
3. Discharge wastewater from said treatment works at the location specified on the attached
map into the Ararat River which is classified Class C waters in the Yadkin Pee -Dee River
Basin.

A.(1)EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS
Permit No. NC0026646
During the period beginning on the effective date of the permit and lasting until expansion above 1.5 MGD or 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
LIMITS
MONITORING REQUIREMENTS
Monthly
Average
Weekly
Average
Daily
Maximum
Measurement
Frequency
Sample
Type
Sample
Locations
Flow
1.5 MGD
Continuous
Recording
I or E
BOD, 5-day, 20°C2
30.0 mg/I
45.0 mg/I
3/week
Composite
E,I
TSS2
30.0 mg/I
45.0 mg/I
3/week
Composite
E,I
NH3-N (April 1 - October 31)
28.6 mg/I
3/week
Composite
E
NH3-N (November 1 - March 31)
3/week
Composite
E
Dissolved Oxygen3
3/week
Grab
E,U,DC-
Fecal Coliform (geometric mean)
200/100 ml
400/100 ml
3/week
Grab
E,U,D-
Temperature
Daily
Grab
E
Temperature
3/week
Grab
U,DL-
Total Residual Chlorine
3/week
Grab
E
Conductivity
3/week
Grab
U,DC
Oil and Grease
3/week
Grab
E
Total Nitrogen (NO2+ NO3 + TKN)
\iI44. oa#bly---
Composite
E
Total Phosphorus
1,vl4an+h4Y-
Composite
E
Chronic Toxicity 4
i
. Quarterly ..
Composite
E
Cadmium
-73-a0-(iic,I.1'
1-82-uq/1-.; 2;•
- --
Weekly-
Composite
E
Cyanide 7
I ,.:11,0 Wereidy ; , -
2/month (
Grab
E
. ' ,•,..
__....__ _ -_ - -
Composite
E
-Arsenic- ,7�r":V ,-,
_.;-, .
-
Copper
2/month
Composite
E
r
e •,z,G-z:", -�__
_ _ -- ----
-- -
---2/month - -
- Composite
E
--Selenium - r-/.;,-';�-, ;:. 17
Silver,
2/month
Composite
E
0 C
2
,11'✓1 l- tiii,
C 1,,,7'7'Le_
Sample locations: E - Effluent, I - Influent, U - Upstream at least 100 feet above outfall, D - Downstream approximately 0.4 miles at NCSR
2044. Instream monitoring shall be grab samples collected 3/wk (Jun -Sep) and 1/wk (Oct -May).
The monthly average effluent BODS and Total Suspended Solids concentrations shall not exceed 15% of the respective influent value (85% removal).
3 The daily average dissolved oxygen effluent concentration shall not be less than 5.0 mg/I.
4 Chronic Toxicity (Ceriodaphnia), P/F, no significant mortality at 3 %; January, April, July, and October; See Supplement to Effluent Limitations and
Monitoring Requirements Page - Special Conditions for flow of '1.5 MGD. iM 0.4; B E 1''£�r-o r�t�� f N C ow T7-(ti C- c4N w�
`" XI (AkfJ i ("LO N kTC
✓h4 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.
There shall be no discharge of floating solids or visible foam in other than trace amounts.
STRV\ PA WOvU A v" N l_ Ns
7 Qt.- Co-- C FJ : 10)' ft
FACI Li TV ? M- -(3R- OF yAO•- F' 17F1_ AS5

ROAD CLASSIFICATION
PRIMARY HIGHWAY
HARD SURFACE
SECONDARY HIGHWAY
HARD SURFACE
LIGHT -DUTY ROAD, HARD OR
IMPROVED SURFACE -
UNIMPROVED ROAD
IN
Latitude 36°21'58" Longitude 80°32'32"
Map # B17NW Sub -basin 30703
Stream Class C
Discharge Class 01
Receiving Stream Ararat River
Design Q 1.50 MOD Permit expires 6/ 30/ 99
0
0SCALE 1:24 000
1 MILE
,1
7000 FEET
0
1 KILOMETER
CONTOUR INTERVAL 20 FEET
Town of Pilot Mtn WWTP
NC0026646
Surry County

A.(2)EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS
Permit No. NC0026646
During the period beginning with expansion above 1.5 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
LIMITS
MONITORING REQUIREMENTS
Monthly
Average
Weekly
Average
Daily
Maximum
Measurement
Frequency
Sample
Type
Sample
Locations
Flow
3.0 MGD
Continuous
Recording
I or E
BOD, 5-day, 20°C2
30.0 mg/I
45.0 mg/I
3/week
Composite
E,I
TSS2
30.0 mg/I
45.0 mg/I
3/week
Composite
E,I
NH3-N (April 1 - October 31)
15.0 mg/I
3/week
Composite
E
NH3-N (November 1 - March 31)
3/week
Composite
E
Dissolved Oxygen3-
3/week
Grab
E,U,Dc'
Fecal Coliform (geometric mean)
200/100 ml
400/100 ml
3/week
Grab
E,U,DC
Temperature
Daily
Grab
E
Temperature
3/week
Grab
U, D`'
Total Residual Chlorine
28 ug/I
3/week
Grab
E
Conductivity__
3/week
Grab
U , D t=
Oil and Grease
3/week
Grab
E
Total Nitrogen (NO2+ NO3 + TKN)
-Monthly j,ay
Composite
E
Total Phosphorus
_Monthly lad%
Composite
E
Chronic Toxicity 4
Quarterly !
Composite
E
Cadmium
--3-T�g/h �L ,]
V . Weekly - �`.%
Composite
E
Cyanides
-93--ug/1
;1 c / 'Weekty,.�.'-_
Grab
E
-Arsenic -
--_----.---
-Composite---_-_
--- -E--- -
Copper
2/month
Composite
E
-Selenium L.r7-1-' , • ram"z
;:rc,
—2/month
Composite
- E--
Silver o-r_ :-
2/month
Composite
E
Vk
1 Sample locations: E - Effluent, I - Influent, U - Upstream at least 100 feet above outfall, D - Downstream approximately 0.4 miles at NCSR
2044. Instream monitoring shall be grab samples collected 3/wk (Jun -Sep) and 1/wk (Oct -May).
2 The monthly average effluent BOD5 and Total Suspended Solids concentrations shall not exceed 15% of the respective influent value (85% removal).
3 The daily average dissolved oxygen effluent concentration shall not be Tess than 5.0 mg/I.
4
The
Chronic Toxicity (Ceriodaphnial, P/F, no significant mortality at 5 %; January, April, July, and October; See Supplement.to Effluent Limitations and
Monitoring Requirements Page - Spe iaC nditions for flow of 3.0 MGD. Mij,5T P7e; T%�i3Oi M��� tN CC N ;i t�lf�C: 014 KAtJ I
(C P \ ; V iv+ : Aria, St) . c /
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.
There shall be no discharge of floating solids or visible foam in other than trace amounts.
67 NCOCGA Nk f,1v ry �-(b R 1 f' 4
7 - .for Cf\i 7 (°.)1/) .
W ik PS i-U N (aj N c w i'TY A M aivI3 e 2- t7 kS Y C C

2'
Permit No. NC0026646
SUPPLEMENT TO EFFLUENT LIMITATIONS
AND MONITORING REQUIREMENTS
SPECIAL CONDITIONS for Flow of 1.5 MGD
A(3). CHRONIC TOXICITY PASS/FAIL PERMIT LIMIT (QRTRLY)
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 3 % (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 January, April, July, and October. 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 P/F Version 9/96

Re: Pilot Mountain
Subject: Re: Pilot Mountain
Date: Tue, 04 May 1999 11:36:19 -0400
From: "Kevin Bowden" <[e-mail]> Internal
To: Bethany Bolt <bethany bolts 2o.enr.state.nc.us>
Bethany, I contacted WSRO on 4/20 and spoke with Jenny Renkin, WSRO rep.
about tox reporting at Pilot Mtn.. Facility hired a new ORC in 1/99 who
has a grade III license but has little experience in running the plant.
Jenny made a site visit on 4/21 and sat down with the ORC and discussed
reporting requirements. I spoke with the operator on 4/22 and he has been
informed about tox testing and reporting requirements. He did not know
about the two pending enforcement actions against the town for late/non
reporting of toxicity self -monitoring data. I think he knows what his
responsibilities are.
Bethany Bolt wrote:
> Kevin,
> Has anything been done recently at Pilot Mt. to rectify their delinquent
> tox. test reporting? I'm drafting up the permit for region comment, and
> thought I would make note it's been a chronic problem (pardon the
> pun!). . .
> Thanks,
> Bethany
1 of 1 5/4/99 1:51 PM

3n'?
LONG TERM MONITORING PLAN REQUEST FORM
FACILITY: Pilot Mountain WWTP
NPDES #: NC0026646
EXPIRATION DATE: 6/30/99
REGION: Winston-Salem
NPDES UNIT REQUESTER: Bethany Bolt
PRETREATMENT CONTACT: Dana Folley
DATE OF REQUEST: 4/15/99
INDICATE THE STATUS OF THE PRETREATMENT PROGRAM:
1. The facility has no SIUs and should not have pretreatment language.
2. The facility has sr-is..de.eleping a pretreatment program.
3. Additional conditions regarding the pretreatment program are attached.
PERMITTED FLOW: 1.5/3.0 MGD
% INDUSTRIAL 55
% DOMESTIIC 45
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r+lcS
�AI _ b2. yoJ '�^cse sX P2c+Poi
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G to Ym A.- d-- r'
'er
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o g PoGs -t7c. exAm,,J1 s t a attAt. r 1
cte 5 _ e� 5 ' �} Sd wit( C to 1
5
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Toy bAnctfr.�
iron' � Lt•o..
e x -b .&ck s� hi�i e -
�3 r - 5 r� S f}_e) iM S C'• nn r-ei aroue. ss ° r-(
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'� `'"eve GL)
o V•i!I.4, CP-� a�aa- c�
a�� ¢ Gam. r\,0 s-G("Q-
1,2f . i-T P , h P
so P o Tu) c4 L.it • - -

Reasonable Potential Analysis: Pilot Mountain WWTP (NC0026646)
•
•:-
(urp
•
';)
Facility Name =
NPDES # =
Qw (MGD) =
7Q10 (cfs)=
IWC (%) _
PILOT MOUNTAIN (001)
NC0026646
1.5
82.2
2.75
1 FINAL RESULTS
Cadmium .-FAY, 5)...c5r,41 4 1;t&; :I ---_ 4.7
Max. Pred Cw (14/1) 12.5
Allowable Cw (41) 72.7
J t
Cyanide Z FAV' Za14-1/S
Max. Pred Cw (µg/1) 59.8
Allowable Cw (4/1) 181.8
Arsenic
Max. Pred Cw (µg/1) 6
Allowable Cw (µg/l) 1,818
Copper iFAV' 9.2)45ii ( A 1-) 4 1271-J-Libti
Max. Pred Cw (µg/1) 141
Allowable Cw (4/1) 254
Selenium
Max. Pred Cw (µg/I) 61
Allowable Cw (µg/l) 182
Silver ZFAV ' • •/Ii
ABOVE ACTION LEVEL
Max. Pred Cw (µg/1) 35.20
Allowable Cw (µg/1) 2.18
1
Lead "I FA . 33. 0i4 51,(t
Max. Pred Cw (µg/1) 13.6
Allowable Cw (µg/1) 908.9
Zinc i FAN/ = & 9; if (A+-) [ p d t c'
Max. Pred Cw (14/1) 187
Allowable Cw (14/1) 1,818
Mercury
Max. Pred Cw (µg/1) (A/D.e) 0.100
Allowable Cw (µg/I) 0.436
Parameter =
Standard =
Cadmium
2.0
µg/I
n
BDL=1/2DL
(µg/I)
Actual
Data (µg/l)
990223
0.50
<1.00
990216
0.50
<1.00
990209
0.50
<1.00
990202
0.50
<1.00
990107
0.50
<1.00
981229
0.50
<1.00*
981221
0.50
<1.00*
981215
1.50
<3.00*
981208
1.00
1.00*
981201
0.50
<1.00*
981123
0.50
<1.00
981117
0.50
<1.00
981113
1.00
1.00
981110
0.50
<1.00
981103
0.50
<1.00
981027
0.50
<1.00
981020
5.00
5.00
981013
1.00
1.00
981008
0.50
<1.00
980929
0.50
<1.00
980922
0.50
<1.00
980915
4.00
4.00
980908
0.50
<1.00
980901
0.50
<1.00
980825
2.0
2.0
980818
0.5
<1.0
980811
0.5
<1.0
980804
0.5
<1.0
980728
0.5
<1.0
980721
0.5
<1.0
980714
0.5
<1.0
980709
0.5
<1.0
980701
0.5
<1.0
980630
0.5
<1.0
980623
0.5
<1.0
980616
0.5
<1.0
980609
0.5
<1.0
980602
0.5
<1.0
RESULTS
Std Dev.
0.98
Mean
0.8,1
C.V.
I.16
Mull Factor =
Max. Value
2.5
(n=49)
5.0 µg/1
Max. Pred Cw
Allowable Cw
12.5 µg/1
72.7 µg/1

Reasonable Potential Analysis: Pilot Mountain WWTP (NC0026646)
i
Chromium Z FAV '9E4.3
Max. Pred Cw (nil)
54.6
Allowable Cw (µg/1) 1817.7
Nickel z FAQ7S9,,j /)
Max. Pred Cw (µg/I)
5
Allowable Cw (µg/I) 3199
Cadmium, cont.
980526
0.5
<1.0
980519
0.5
<1.0
980512
3.0
3.0
980505
0.5
<1.0
980428
0.5
<1.0
980421
0.5
<1.0
980414
0.5
<1.0
980409
0.5
<1.0
980401
0.5
<1.0
980302
0.5
<1.0
980202
0.5
<1.0
50
*DMR reported "<0.001 µg/1" and "<0.003 µg/I," but 1 assumed these were
actually in mg/I.

Reasonable Potential Analysis: Pilot Mountain WWTP (NC0026646)
�• n
Facility Name =
NPDES # =
Qw (MGD) =
7Q10 (cfs)=
IWC (%) =
PILOT
MOUNTAIN (001)
NC0026646
1.5
82.2
2.75
Parameter =
Standard =
Cyanide
5.0
uel
n
BDL=1/2DL
(141)
Actual Data
(gel)
990223
2.50
<5.00
990216
2.50
<5.00
990209
2.50
<5.00
990202
2.50
<5.00
990107
2.50
<5.00
981229
5.00
<10.0*
981221
5.00
<10.0*
981215
5.00
<10.0*
981208
5.00
<10.0*
981201
5.00
<10.0*
981123
2.50
<5.00
981117
2.50
<5.00
981113
2.50
<5.00
981110
2.50
<5.00
981103
2.50
<5.00
981027
10.00
10.00
981020
16.00
16.00
981013
2.50
<5.00
981008
2.50
<5.00
980929
26.00
26.00
980922
12.00
12.00
980915
8.00
8.00
980908
2.50
<5.00
980901
6.00
6.00
980825
2.5
<5.0
980818
2.5
<5.0
980811
2.5
<5.0
980804
2.5
<5.0
980728
2.5
<5.0
980721
2.5
<5.0
980714
2.5
<5.0
980709
2.5
<5.0
980702
2.5
<5.0
980630
2.5
<5.0
980623
2.5
<5.0
980616
2.5
<5.0
980609
9.0
9.0
980602
2.5
<5.0
RESULTS
Std Dev.
4.30
Mean
4.38
C.V.
0.98
Mult Factor = 2.3 (n=49)
Max. Value 26.0 µg/l
Max. Pred Cw 59.8 µg/l
Allowable Cw 181.8 µg/I

Reasonable Potential Analysis: Pilot Mountain WWTP (NC0026646)
Cyanide, cont.
980526
2.5
<5.0
980519
2.5
<5.0
980512
2.5
<5.0
980505
10.0
10.0
980428
2.5
<5.0
980421
5.0
5.0
980414
2.5
<5.0
980409
2.5
<5.0
980401
2.5
<5.0
980302
2.5
<5.0
980202
2.5
<5.0
50
*DMR reported "<0.01 µg/1," but I assumed these were
actually in mg/l.
a-

Reasonable Potential Analysis: Pilot Mountain WWTP (NC0026646)
clk
Facility Name =
NPDES # =
Qw (MGD) =
7Q10 (cfs)=
IWC (%) =
PILOT
MOUNTAIN (001)
NC0026646
1.5
82.2
2.75
Parameter =
Standard =
Arsenic
50
n
BDL=1/2DL
(µg/l)
Actual Data
(µg/l)
990216
1.5
<3.0
990202
1.5
<3.0
990107
3.5
3.5
981215
0.5
<1*
981201
3
3*
981117
1.5
<3.0
981103
1.5
<3.0
981020
1.5
<3.0
981008
1.5
<3.0
980915
1.5
<3.0
980901
1.5
<3.0
980818
2.5
<5.0
980804
2.5
<5.0
980721
2.5
<5.0
980709
2.5
<5.0
980708
2.5
<5.0
980707
2.5
<5.0
980616
1.5
<3.0
980602
1.5
<3.0
980519
1.5
<3.0
980505
1.5
<3.0
980409
1.5
<3.0
980401
1.5
<3.0
24
RESULTS
Std Dev.
0.68
Mean
1.87
C.V.
0.36
Mult Factor =
Max. Value
Max. Pred Cw
Allowable Cw
1.7
(n=23)
4 µg/1
6 µg/1
1818 µg/l
*DMR reported "0.003 µg/I" and "<0.001 µg/l," but I assumed these were
actually in mg/l.
l"

Reasonable Potential Analysis: Pilot Mountain WWTP (NC0026646)
Facility Name =
NPDES # =
Qw (MGD) =
7Q10 (cfs)=
IWC (%) =
I
PILOT
MOUNTAIN (001)
NC0026646
1.5
82.2
2.75
Parameter =
Standard =
Copper
7
µgII (AL)
n
BDL=1/2DL
(11g/1)
Actual Data
(µg/1)
990216
35.0
35.0
990202
45.0
45.0
990107
32.0
32.0
981201
0.034
0.034
981117
37.0
37.0
981103
26.0
26.0
981020
56.0
56.0
981008
11.0
11.0
980915
16.0
16.0
980901
16.0
16.0
980818
12.0
12.0
980804
12.0
12.0
980721
15.0
15.0
980709
17.0
17.0
980616
24.0
24.0
980602
47.0
47.0
980519
45.0
45.0
980505
64.0
64.0
980409
18.0
18.0
980401
11.0
11.0
980302
20.0
20.0
980202
30.0
30.0
23
RESULTS
Std Dev.
16.58
Mean
26.77
C.V.
0.62
Mult Factor =
Max. Value
Max. Pred Cw
Allowable Cw
2.2
(n=22)
64 pg/1
141 µg/1
254 µg/1

Reasonable Potential Analysis: Pilot Mountain WWTP (NC0026646)
Facility Name =
NPDES # =
Qw (MGD) =
7Q10 (cfs)=
1WC ("/o) =
PILOT
MOUNTAIN (001)
NC0026646
1.5
82.2
2.75
Parameter =
Standard =
Selenium
5
µg/1
n
BDL=1/2DL
(µe)
Actual Data
(PA
990216
2.5
<5.0
990202
2.5
<5.0
990107
2.5
<5.0
981201
5
5*
981215
2.5
<5.0*
981117
2.5
<5.0
981103
2.5
<5.0
981020
2.5
<5.0
981008
2.5
<5.0
980915
2.5
<5.0
980901
2.5
<5.0
980818
2.5
<5.0
980804
2.5
<5.0
980721
2.5
<5.0
980709
2.5
<5.0
980616
2.5
<5.0
980602
2.5
<5.0
980519
2.5
<5.0
980505
2.5
<5.0
980409
2.5
<5.0
980401
2.5
<5.0
980302
17.5
<25.0
980202
17.5
<25.0
24
*DMR reported "0.005 µg/1," but I assumed this was
actually in mg/1.
RESULTS
Std Dev.
4.32
Mean
3.91
C.V.
1.10
Mull Factor =
Max. Value
Max. Pred Cw
Allowable Cw
3.5
(n=23)
18 pg/1
61 pg/1
182 pg/1

Reasonable Potential Analysis: Pilot Mountain WWTP (NC0026646)
Facility Name =
NPDES # =
Qw (MGD) =
7Q10 (cfs)=
1WC (%) =
PILOT
MOUNTAIN (001)
NC0026646
1.5
82.2
2.75
Parameter =
Standard =
Silver
0.06
Inn (AL)
n
BDL=1/2DL
(µg/1)
Actual Data
(µg/1)
990216
4.2
4.2
990202
11.0
11.0
990107
1.5
<3.0
981201
1.5
<3.0
981215
1.5
<3.0*
981117
1.5
<3.0
981103
1.5
<3.0
981020
1.5
<3.0
981008
1.5
<3.0
980915
1.5
<3.0
980901
1.5
<3.0
980818
6.0
6.0
980804
7.0
7.0
980721
1.5
<3.0
980709
1.5
<3.0
980616
1.5
<3.0
980602
1.5
<3.0
980519
1.5
<3.0
980505
1.5
<3.0
980409
1.5
<3.0
980401
1.5
<3.0
980302
1.5
<3.0
980202
1.5
<3.0
24
*DMR reported "<0.003 µg/1," but I assumed this was
actually in mg/1.
RESULTS
Std Dev.
2.40
Mean
2.47
C.V.
0.97
Mult Factor = 3.2 (n=23)
Max. Value 11.00 µg/1
Max. Pred Cw 35.20 µg/1
Allowable Cw 2.18 µg/1

Reasonable Potential Analysis: Pilot Mountain WWTP (NC0026646)
Facility Name =
NPDES # =
Qw (MGD) =
7Q10 (cfs)=
IWC (%) =
PILOT
MOUNTAIN (001)
NC0026646
1.5
82.2
2.75
Parameter =
Standard =
Lead
25
µ�
n
BDL=1/2DL
(sg/1)
Actual Data
(11P/1)
990107
1.00
<2.00
981006
4.0
4.0
980709
1.0
<2.0
980407
1.0
<2.0
980302
1.0
<2.0
980115
1.0
<2.0
980106
1.0
<2.0
971201
1.0
<2.0
971103
1.0
<2.0
971016
1.0
<2.0
971006
1.0
<2.0
13
RESULTS
Std Dev.
0.90
Mean
1.27
C.V.
0.71
Mult Factor =
Max. Value
Max. Pred Cw
Allowable Cw
3.4
(n=11)
4 µg/I
14 µg/1
909 µg/I
Shaded data point considered an outlier.

Reasonable Potential Analysis: Pilot Mountain WWTP (NC0026646)
Facility Name =
NPDES # =
Qw (MGD) =
7Q10 (cfs) _
IWC (%) =
PILOT
MOUNTAIN (001)
NC0026646
1.5
82.2
2.75
Parameter =
Standard =
Zinc
50
µg/1(AL)
n
BDL=1/2DL
(11g/1)
Actual Data
(11g/1)
990107
96.00
96.00
981006
110.0
110.0
980709
74.0
74.0
980407
101.0
101.0
980302
47.0
47.0
980202
58.0
58.0
980115
71.0
71.0
980106
70.0
70.0
971201
66.0
66.0
971103
65.0
65.0
971016
62.0
62.0
971006
52.0
52.0
13
RESULTS
Std Dev.
19.70
Mean
72.67
C.V.
0.27
Mult Factor =
Max. Value
Max. Pred Cw
Allowable Cw
1.7
(n=12)
110 µg/1
187 µg/I
1818 µg/1

Reasonable Potential Analysis: Pilot Mountain WWTP (NC0026646)
Facility Name =
NPDES # _
Qw (MGD) =
7Q10 (cfs)=
IWC (%) =
PILOT
MOUNTAIN (001)
NC0026646
1.5
82.2
2.75
Parameter =
Standard =
Mercury
0.012
Pe
n
BDL=1/2D
(14I1)
Actual Data
(µg/1)
990107
0.1
<0.2
981006
0.1
<0.2
980709
Several data points
in between
980407
_
these dates. All Non -detects.
980302
_
980202
980115
980106
971201
971103
971016
971006
y
v
13
RESULTS
Std Dev.
0.00
Mean
0.10
C.V.
0.00
Mult Factor =
Max. Value
Max. Pred Cw
Allowable Cw
1
(n=n/a)
0.100 µg/1
0.100 µg/1
0.436 µg/1

Reasonable Potential Analysis: Pilot Mountain WWTP (NC0026646)
Facility Name =
NPDES # =
Qw (MGD) =
7Q10 (cfs)=
IWC (%) =
PILOT
MOUNTAIN (001)
NC0026646
1.5
82.2
2.75
Parameter =
Standard =
Chromium
50
Pel
n
BDL=1/2DL
(118/1)
Actual Data!
(W1)
990107
1.00
<2.00
981006
4.0
4.0
980709
2.0
2.0
980407
13.0
13.0
980302
2.6
2.6
980202
1.00
<2.00
980115
3.0
3.0
980106
1.00
<2.00
971201
2.0
2.0
971103
4.0
4.0
971016
5.0
5.0
971006
4.0
4.0
13
RESULTS
Std Dev.
3.27
Mean
3.55
C.V.
0.92,
Mult Factor =
Max. Value
Max. Pred Cw
Allowable Cw
4.2
(n=12)
13 µg/1
55 µg/1
1818 µg/l

Reasonable Potential Analysis: Pilot Mountain WWTP (NC0026646)
Facility Name =
NPDES # =
Qw (MGD) =
7Q10 (cfs)=
IWC(%)=
PILOT
MOUNTAIN (001)
NC0026646
1.5
82.2
2.75
Parameter =
Standard =
Nickel
88
µg/1
n
BDL=1/2DL
(µg/l)
Actual Data
(µg/l)
990107
5.00
<10.00
981006
5.0
<10.0
980709
5.0
<10.0
980407
5.0
<10.0
980302
5.0
<10.0
980202
5.0
<10.0
980115
5.0
<10.0
980106
5.0
<10.0
971201
All Non -detects
971103
971016
971006
13
RESULTS
Std Dev.
0.00
Mean
5.00
C.V.
0.00
Mull Factor =
Max. Value
Max. Pred Cw
Allowable Cw
1
(n=n/a)
5 µg/1
5 µg/1
3199 µg/1

Reasonable Potential Analysis: Pilot Mountain WWTP (NC0026646)
Facility Name =
NPDES # =
Qw (MGD) =
7Q10 (cfs)=
1WC (%) =
PILOT MOUNTAIN (001)
NC0026646
3.0
82.2
5.35
FINAL RESULTS
Cadmium ZFAV .5,e <a.42c1%<�rd =. 4.-•-(
Max. Pred Cw (µ t 12.5
Allowable Cw (µg/I) 37.4
i
Cyanide z R V : Z2)t /J <et r ,E.c ee .'. 1i,1.,..)-
Max. Pred Cw (µg/1) l 59.8
Allowable Cw (µgfl) 93.4
Arsenic
Max. Pred Cw (µg/1) 6
Allowable Cw (µg/1) 934
'- f AL < ctt ce
Copper 2 �� �'Z �J ABOVE ACTION LEVEL
Max. Pred Cw (µgfl) 141
Allowable Cw (WI) 131
Selenium
Max. Pred Cw (µg/I) 61
Allowable Cw (µg/I) 93
Silver ABOVE ACTION LEVEL
Max. Pred Cw (µg/I) 35.20
Allowable Cw (µg/I) 1.12
Lead 2 FA =33. 01/�
Max. Pred Cw (µg/I) 13.6
Allowable Cw WI) 466.9
FAV ' tPSJJ / 0CAO C /Ytec -b7f
Zinc 2 `
Max. Pred Cw WA) 187
Allowable Cw (4/1) 934
Mercury
Max. Pred Cw (4/1) 0.100
Allowable Cw (µg/I) 0.224
Parameter =
Standard =
Cadmium
2.0
µJI
n
BDL=1/2DL
(µg/I)
Actual
Data (µg/I)
990223
0.50
<1.00
990216
0.50
<1.00
990209
0.50
<1.00
990202
0.50
<1.00
990107
0.50
<1.00
981229
0.50
<1.00*
981221
0.50
<1.00*
981215
1.50
<3.00*
981208
1.00
1.00*
981201
0.50
<1.00*
981123
0.50
<1.00
981117
0.50
<1.00
981113
1.00
1.00
981110
0.50
<1.00
981103
0.50
<1.00
981027
0.50
<1.00
981020
5.00
5.00
981013
1.00
1.00
981008
0.50
<1.00
980929
0.50
<1.00
980922
0.50
<1.00
980915
4.00
4.00
980908
0.50
<1.00
980901
0.50
<1.00
980825
2.0
2.0
980818
0.5
<1.0
980811
0.5
<1.0
980804
0.5
<1.0
980728
0.5
<1.0
980721
0.5
<1.0
980714
0.5
<1.0
980709
0.5
<1.0
980701
0.5
<1.0
980630
0.5
<1.0
980623
0.5
<1.0
980616
0.5
<1.0
980609
0.5
<1.0
980602
0.5
<1.0
RESULTS
Std Dev.
0.98
Mean
0.84
C.V.
I.16
Mult Factor =
Max. Value
Max. Pred Cw
Allowable Cw
2.5
(n=49)
5.0 µg/1
12.5 µg/1
37.4 µg/1

Reasonable Potential Analysis: Pilot Mountain WWTP (NC0026646)
Chromium 7 FA V = 9044. -3 j
Max. Pred Cw (µg/1)
Allowable Cw (WI)
54.6
933.9
r
Nickel i FA V. 78 9
Max. Pred Cw (mil)
5
Allowable Cw (µg/I)
1644
Cadmium, cont.
980526
0.5
<1.0
980519
0.5
<1.0
980512
3.0
3.0
980505
0.5
<1.0
980428
0.5
<1.0
980421
0.5
<1.0
980414
0.5
<1.0
980409
0.5
<1.0
980401
0.5
<1.0
980302
0.5
<1.0
980202
0.5
<1.0
50
*DMR reported "<0.001 µg/I" and "<0.003 µg/l," but I assumed these were
actually in mg/1.

Reasonable Potential Analysis: Pilot Mountain WWTP (NC0026646)
Facility Name =
NPDES # _
Qw (MGD) =
7Q10 (cfs)=
IWC (%) =
PILOT
MOUNTAIN (001)
NC0026646
3.0
82.2
5.35
Parameter =
Standard =
Cyanide
5.0
n
BDL=1/2DL
(time)
Actual Data
(µme)
990223
2.50
<5.00
990216
2.50
<5.00
990209
2.50
<5.00
990202
2.50
<5.00
990107
2.50
<5.00
981229
5.00
<10.0*
981221
5.00
<10.0*
981215
5.00
<10.0*
981208
5.00
<10.0*
981201
5.00
<10.0*
981123
2.50
<5.00
981117
2.50
<5.00
981113
2.50
<5.00
981110
2.50
<5.00
981103
2.50
<5.00
981027
10.00
10.00
981020
16.00
16.00
981013
2.50
<5.00
981008
2.50
<5.00
980929
26.00
26.00
980922
12.00
12.00
980915
8.00
8.00
980908
2.50
<5.00
980901
6.00
6.00
980825
2.5
<5.0
980818
2.5
<5.0
980811
2.5
<5.0
980804
2.5
<5.0
980728
2.5
<5.0
980721
2.5
<5.0
980714
2.5
<5.0
980709
2.5
<5.0
980702
2.5
<5.0
980630
2.5
<5.0
980623
2.5
<5.0
980616
2.5
<5.0
980609
9.0
9.0
980602
2.5
<5.0
RESULTS
Std Dev.
4.30
Mean
4.38
C.V.
0.98
Malt Factor =
Max. Value
Max. Pred Cw
Allowable Cw
2.3
(n=49)
26.0 µg/1
59.8 µg/1
93.4 µg/1

Reasonable Potential Analysis: Pilot Mountain WWTP (NC0026646)
A
Cyanide, cont.
980526
2.5
<5.0
980519
2.5
<5.0
980512
2.5
<5.0
980505
10.0
10.0
980428
2.5
<5.0
980421
5.0
5.0
980414
2.5
<5.0
980409
2.5
<5.0
980401
' 2.5
<5.0
980302
2.5
<5.0
980202
2.5
<5.0
50
*DMR reported "<0.01 µg/1," but I assumed these were
actually in mg/l.

Reasonable Potential Analysis: Pilot Mountain WWTP (NC0026646)
Facility Name =
NPDES # =
Qw (MGD) =
7Q10 (cfs)=
IWC (%) =
PILOT
MOUNTAIN (001)
NC0026646
3.0
82.2
5.35
Parameter =
Standard =
Arsenic
50
n
BDL=1/2DL
(µg/1)
Actual Data
(µme)
990216
1.5
<3.0
990202
1.5
<3.0
990107
3.5
3.5
981215
0.5
<1*
981201
3
3*
981117
1.5
<3.0
981103
1.5
<3.0
981020
1.5
<3.0
981008
1.5
<3.0
980915
1.5
<3.0
980901
1.5
<3.0
980818
2.5
<5.0
980804
2.5
<5.0
980721
2.5
<5.0
980709
2.5
<5.0
980708
2.5
<5.0
980707
2.5
<5.0
980616
1.5
<3.0
980602
1.5
<3.0
980519
1.5
<3.0
980505
1.5
<3.0
980409
1.5
<3.0
980401
1.5
<3.0
24
RESULTS
Std Dev.
0.68
Mean
1.87
C.V.
0.36
Mult Factor =
Max. Value
Max. Pred Cw
Allowable Cw
1.7
(n=23)
4 µg/1
6 µg/1
934 µg/1
*DMR reported "0.003 µg/l" and "<0.001 µg/1," but I assumed these were
actually in mg/l.

8
Reasonable Potential Analysis: Pilot Mountain WWTP (NC0026646)
Facility Name =
NPDES # =
Qw (MGD) =
7Q10 (cfs)=
1WC(%)=
PILOT
MOUNTAIN (001)
NC0026646
3.0
82.2
5.35
Parameter =
Standard =
Copper
7
µg/1 (AL)
n
BDL=1/2DL
(µ /1)
Actual Datal
(110)
990216
35.0
35.0
990202
45.0
45.0
990107
32.0
32.0
981201
0.034
0.034
981117
37.0
37.0
981103
26.0
26.0
981020
56.0
56.0
981008
11.0
11.0
980915
16.0
16.0
980901
16.0
16.0
980818
12.0
12.0
980804
12.0
12.0
980721
15.0
15.0
980709
17.0
17.0
980616
24.0
24.0
980602
47.0
47.0
980519
45.0
45.0
980505
64.0
64.0
980409
18.0
18.0
980401
11.0
11.0
980302
20.0
20.0
980202
30.0
30.0
23
RESULTS
Std Dev.
16.58
Mean
26.77
C.V.
0.62
Mult Factor =
Max. Value
Max. Pred Cw
Allowable Cw
2.2
(n=22)
64 µg/1
141 µg/1
131 µg/1

Reasonable Potential Analysis: Pilot Mountain WWTP (NC0026646)
Facility Name =
NPDES # =
Qw (MGD) =
7Q10 (cfs)=
IWC (%) =
PILOT
MOUNTAIN (001)
NC0026646
3.0
82.2
5.35
Parameter =
Standard =
Selenium
5
n
BDL=1/2DL
(PA
Actual Data
(11gf1)
990216
2.5
<5.0
990202
2.5
<5.0
990107
2.5
<5.0
981201
5
5*
981215
2.5
<5.0*
981117
2.5
<5.0
981103
2.5
<5.0
981020
2.5
<5.0
981008
2.5
<5.0
980915
2.5
<5.0
980901
2.5
<5.0
980818
2.5
<5.0
980804
2.5
<5.0
980721
2.5
<5.0
980709
2.5
<5.0
980616
2.5
<5.0
980602
2.5
<5.0
980519
2.5
<5.0
980505
2.5
<5.0
980409
2.5
<5.0
980401
2.5
<5.0
980302
17.5
<25.0
980202
17.5
<25.0
24
*DMR reported "0.005 µg/1," but I assumed this was
actually in mg/I.
RESULTS
Std Dev.
4.32
Mean
3.91
C.V.
1.10
Mult Factor =
Max. Value
Max. Pred Cw
Allowable Cw
3.5
(n=23)
18 µg/l
61 µg/1
93 µg/1

Reasonable Potential Analysis: Pilot Mountain W W'1'1' (NC0026646)
Facility Name =
NPDES # =
Qw (MGD) =
7Q10 (cfs)=
1WC (%) =
PILOT
MOUNTAIN (001)
NC0026646
3.0
82.2
5.35
Parameter =
Standard =
Silver
0.06
µg/1(AL)
n
BDL=1/2DL
(µWO)
Actual Data
(µme)
990216
4.2
4.2
990202
11.0
11.0
990107
1.5
<3.0
981201
1.5
<3.0
981215
1.5
<3.0*
981117
1.5
<3.0
981103
1.5
<3.0
981020
1.5
<3.0
981008
1.5
<3.0
980915
1.5
<3.0
980901
1.5
<3.0
980818
6.0
6.0
980804
7.0
7.0
980721
1.5
<3.0
980709
1.5
<3.0
980616
1.5
<3.0
980602
1.5
<3.0
980519
1.5
<3.0
980505
1.5
<3.0
980409
1.5
<3.0
980401
1.5
<3.0
980302
1.5
<3.0
980202
1.5
<3.0
24
*DMR reported "<0.003 µg/1," but I assumed this was
actually in mg/1.
RESULTS
Std Dev.
2.40
Mean
2.47
C.V.
0.97
Mult Factor =
Max. Value
Max. Pred Cw
Allowable Cw
3.2
(n=23)
11.00 µg/1
35.20 µg/1
1.12 µg/1

Reasonable Potential Analysis: Pilot Mountain WWTP (NC0026646)
Facility Name =
NPDES II =
Qw (MGD) =
7Q10 (cfs)=
IWC (%) =
PILOT
MOUNTAIN (001)
NC0026646
3.0
82.2
5.35
Parameter =
Standard =
Lead
25
n
BDL=1/2DL
(µell)
Actual Data
(11g/1)
990107
1.00
<2.00
981006
4.0
4.0
980709
1.0
<2.0
980407
1.0
<2.0
980302
1.0
<2.0
980202
43.0
980115
1.0
<2.0
980106
1.0
<2.0
971201
1.0
<2.0
971103
1.0
<2.0
971016
1.0
<2.0
971006
1.0
<2.0
13
RESULTS
Std Dev.
0.90
Mean
1.27
C.V.
0.71
Mult Factor =
Max. Value
Max. Pred Cw
Allowable Cw
3.4
(n=1 1)
4 µg/I
14 µg/1
467 µg/1
Shaded data point considered an outlier.

Reasonable Potential Analysis: Pilot Mountain WWTP (NC0026646)
Facility Name =
NPDES # =
Qw (MGD) =
7Q10 (cfs)=
IWC (%) _
PILOT
MOUNTAIN (001)
NC0026646
3.0
82.2
5.35
Parameter =
Standard =
Zinc
50
µg/1(AL)
n
BDL=1/2DL
(µg/1)
Actual Data
(11g/1)
990107
96.00
96.00
981006
110.0
110.0
980709
74.0
74.0
980407
101.0
101.0
980302
47.0
47.0
980202
58.0
58.0
980115
71.0
71.0
980106
70.0
70.0
971201
66.0
66.0
971103
65.0
65.0
971016
62.0
62.0
971006
52.0
52.0
13
RESULTS
Std Dev.
19.70
Mean
C.V.
72.67
0.27
Mull Factor =
Max. Value
Max. Pred Cw
Allowable Cw
1.7
(n=12)
110 µg/1
187 µg/1
934 µg/1

Reasonable Potential Analysis: Pilot Mountain WWTP (NC0026646)
Facility Name =
NPDES # =
Qw (MGD) =
7Q10 (cfs)=
IWC (%) =
PILOT
MOUNTAIN (001)
NC0026646
3.0
82.2
5.35
Parameter =
Standard =
Mercury
0.012
µO
n
BDL=1/2D
(µg/1)
Actual Data
(µg/l)
990107
0.1
<0.2
981006
0.1
<0.2
980709
Several data points
in between
980407
_
these dates. All Non -detects.
980302
_
980202
980115
980106
971201
971103
971016
971006
v
•
13
RESULTS
Std Dev.
0.00
Mean
0.10
C.V.
0.00
Mult Factor =
Max. Value
Max. Pred Cw
Allowable Cw
1
(n=n/a)
0.100 µg/1
0.100 µg/I
0.224 µg/l

Reasonable Potential Analysis: Pilot Mountain WWTP (NC0026646)
Facility Name =
NPDES # =
Qw (MGD) =
7Q10 (cfs)=
IWC (%) _
PILOT
MOUNTAIN (001)
NC0026646
3.0
82.2
5.35
Parameter =
Standard =
Chromium
50
µg/1
n
BDL=1/2DL
(µPS)
Actual Data
(µme)
990107
1.00
<2.00
981006
4.0
4.0
980709
2.0
2.0
980407
13.0
13.0
980302
2.6
2.6
980202
1.00
<2.00
980115
3.0
3.0
980106
1.00
<2.00
971201
2.0
2.0
971103
4.0
4.0
971016
5.0
5.0
971006
4.0
4.0
13
RESULTS
Std Dev.
3.27
Mean
3.55
C.V.
0.92
Mult Factor =
Max. Value
Max. Pred Cw
Allowable Cw
4.2
(n=12)
13 µg/1
55 µg/!
934 µg/1

Reasonable Potential Analysis: Pilot Mountain WWTP (NC0026646)
Facility Name =
NPDES # =
Qw (MGD) =
7Q10 (cfs)=
1WC (%) =
PILOT
MOUNTAIN (001)
NC0026646
3.0
82.2
5.35
Parameter =
Standard =
Nickel
88
AO
n
BDL=1/2DL
(µme)
Actual Data
(Pei)
990107
5.00
<10.00
981006
5.0
<10.0
980709
5.0
<10.0
980407
5.0
<10.0
980302
5.0
<10.0
980202
5.0
<10.0
980115
5.0
<10.0
980106
5.0
<10.0
971201
All Non -detects
971103
971016
971006
13
RESULTS
Std Dev.
0.00
Mean
5.00
C.V.
0.00
Mult Factor = 1 (n=n/a)
Max. Value 5 µg/1
Max. Pred Cw 5 µg/1
Allowable Cw 1644 µg/l

-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
Billy Pell
Town of Pilot Mountain
126 West Main Street
Pilot Mountain, NC 27041
Dear Permittee:
A149174
NC DENR
June 1, 1998
Subject: Implementation of Yadkin Pee -Dee River Basin Association
NPDES Permit Modification for Instream Sampling
NPDES Permit NC0026646
Surry County
As a participant in the coordinated instream monitoring efforts within the Yadkin -Pee Dee River basin,
your facility and the North Carolina Department of Environment and Natural Resources (DENR) have
entered into an agreement that provides both parties with an effective environmental monitoring tool. By
this letter, the DENR is waiving the instream monitoring requirements as specified within your individual
NPDES permit beginning June 1, 1998. As specified in the Memorandum of Agreement (MOA) signed by
this agency and you (or your representative), the agreement identifies the stations, parametric coverage
and frequency of analysis required in order that the instream monitoring requirements be waived for your
facility.
All other terms and conditions in the original permit remain unchanged and in full effect. These
modifications are issued pursuant to the requirements of North Carolina General Statute 143-215.1 and
the Memorandum of Agreement between North Carolina and the U.S. Environmental Protection Agency
dated December 6, 1983. Should your membership in the agreement be terminated, the instream
monitoring requirements specified in your permit will be reinstated. You shall notify the Division
immediately upon termination of membership.
I would like to express my appreciation for the cooperation and participation of all participants in this
innovative approach to environmental monitoring. It is expected that the results of the agreement will
effectively contribute to our understanding of the Yadkin -Pee Dee River basin environment. We have
designated Cathy Tyndall as our primary contact for issues related to the MOA. She can be reached at
[phone].
We also look forward to the advances that this cooperative agreement will provide in our management of
the Yadkin -Pee Dee River basin and ask that you feel free to contact us should any questions arise
regarding the monitoring efforts or interpretations of the information collected. We will be maintaining
our own series of monitoring stations in the basin which, when added to the information collected by this
agreement, will greatly expand our knowledge of this environmental system. We thank you again for your
participation and look forward to a successful monitoring effort.
Preston Howard, Jr., P.E.
cc: Central Files
Winston-Salem Regional Office, Water Quality Section
Susan Wilson, Point Source Compliance Enforcement Unit
Cathy Tyndall, Environmental Sciences Branch
NPDES Unit Files
P.O. Box 29535, Raleigh, North Carolina 27626-0535 919 733-5083, extension 511 (fax) 919 733-0719
An Equal Opportunity Affirmative Action Employer 50% recycled / 10% post -consumer paper

DEHNR/DW
FACT SHEET FOR NPDES PERMIT DEVELOPMENT O MENT
NPDES No NC0026646 W i Cl S t c t r- S a l e
Applicant/Facility Name:.-.°. -
Town of Pilot Mountain
Applicant Address:
Post Office Drawer AA
_
Facility Address: =
Lynchburg Road, Pilot Mountain -
Permitted Flow
1.5/3.0 MGD
Type of Waste: _
Domestic-45%, Industrial-55% (estimate)
Facility/Permit Status:
Existing/Renewal
County:. , c
a�.��.�t C
Surry •.
.... _ _. . _ � ... . • :.r _
"`a�-�"y
"t'•'17'1"'
;;�csr ::. 'Y �.�"--�..-�.CaC^s- r � ;• � +:M��.' + .�'*i�''`y`'�
3 aN�s�t'•1Etr'• '�. v-s..T.41.-. .... F. 4,,: Stireaii Characterist cs .' f t4 .Q�.....' 3w~i.�.• F..:.�. t�
Receiving Stream _
- Ararat River-. . =
Stream Classification
C .
Subbasin
03-07-03
Drainage Area (mi2):
287
-
Summer 7Q10 (cfs)
82.2
Winter 7Q10 (cfs):
163
Average Flow (cfs):
379 '
IWC at 1.5/3.0 MGD (%):
2.75/5.35 -
-_ _ ; �: -, , *-17- ,= Miscellaneous r -_.. ti F-4-- �;
Regional Office:
Winston-Salem
USGS Topo Quad:
B 16SE
WLA Summary
BOD and TSS are effluent limited and will remain unchanged in the proposed permit.
The ammonia toxicity mass balance calculation using S7Q10 and permitted flows indicated
that the ammonia limits will also remain unchanged from the previous permit period: 28.6
mg/1 (summer at 1.5 MGD) and 15.0 mg/1 (summer at 3.0 MGD) and no limits in the
winter.
The chlorine toxicity mass balance calculation using S7Q10 and permitted flows indicated
very high chlorine limits and thus the cap of 28 ug/1 will remain unchanged in the permit.
Total nitrogen effluent concentrations ranged from about 5-14 mg/1 and total phosphorus
effluent concentrations ranged from 2-5 mg/1, but the treatment system does not discharge
into a nutrient limited stream. Thus, these concentrations are not expected to adversely
impact the receiving stream.
Recommend the temperature footnote be eliminated from the permit because
this is not a thermal discharge.
©gall)
OCT 1 4 1991
POINT SOURCE BRANCH

The reasonable potential analysis was£ conducted for 1.5 and 3.0 MGD and results can be
summarized as follows:
Nan%:' 't-:
- afroffi: Detects'
El MGDA
3.O MGL
; �, ,
Cadmium
4 out of 31
MPC>AEC
MPC>AEC
Chromium
23 out of 31
MPC<AEC
MPC<AEC
Copper
24 out of 24
MPC>AEC
MPC>AEC -
Cyanide
9 out of 32 .:
MPC>AEC
MPC>AEC
Lead
9 out of 31
MPC<AEC
MPC<AEC
Mercury
0 out of 31
MPC<AEC
MPC<AEC
Nickel
3 out of 31
MPC<AEC
MPC<AEC
Silver
7 out of 23 :
MPC>AEC ;
MPC>AEC
Zinc
23 out of 23
MPC<AEC
MPC<AEC
lvlt'l;: maximum preclicted concentration
AEC: allowable effluent concentration
Those parameters indicated in bold will be limited. The Long Tenn Monitoring Plan
(LTMP) requires monitoring for all of the parameters listed in the above table. Monitoring
(but no limit) will be required for copper and silver. Although the MPC exceeded the AEC
for these two parameters, they do not have water quality standards, only action levels.
The Pretreatment Allocation table indicates that copper, cyanide, lead, and zinc are expected
to be discharged from the three industries which discharge to Pilot Mountain WWTP.
Pretreatment is investigating the source of cadmium.
1995 and 1996 APAM data were reviewed. Parameters in summary table include those:
(1) above the detection limit, and (2) for which monitoring is not required in either the
NPDES permit or the pretreatment permit (LTMP).
Name --:.
10/95
Ley
t11/96
`,WOjStd,o �=
��f` [' .'3C�'i!�
Fed.., Crifeiria,
AEC/1.5MGD
L.� T' ....��i�+-.. .»i.� ,`..L�--�
. �
.
AEC/30MGI)Y
-.
R't
Lr "}� {s{ �.
.5t, _ . a, �v �� :
_.._�.S_.+G:SJ�3�
- _. , .
,.._::..�:µs
G
� :1a :: M M
Aluminum
310
590
acute 750
chronic 87
chronic 3163
chronic 1625 -
Antimony
46
245
4300 OC
not calculated
not calculated
Arsenic
BDL
194
50 aql
1818
933
Selenium
4.2
175
5 aql
182
93
Barium
35
39
2000 MCL
not calculated .
not calculated
Chloride •
62000
52100
acute860000
chronic230000
not calculated
not calculated
Fluoride
950
'
730
1800 aql _
not calculated
not calculated
Bromodichlo
romethane
23.2-
BDL
22,46q
not calculated -
not calculated -
Bromoform
1.2
BDL
360 -
not calculated
not calculated
Chloroform
23.4
BDL
34
not calculated
not calculated
Dibromochlo
romethane
10.6
BDL
470
not calculated
not calculated
AEC: Allowable Effluent Concentration OC: . Organism Consumption
BDL: Below Detection Level aql: aquatic life criteria
MCL: Maximum Contaminant Level
q: Value determined after federal criteria published, or new cancer potency slope factor
All concentrations are in ug/1 unless indicated otherwise.
Page2of4

Selenium monitoring will be required (but not limited) because the 1996 detection was.
greater than the allowable effluent concentration at 3.0 MGD. Although the arsenic
detection was well below the allowable effluent concen1rations at o and 3:O MGD,
its concentration was well above a water uali standard, Thus, it is considered a
_....
pollutant of concern and monitoring (lout no limit) will be required. Monitoring will not be
_required for any other inorganic parameters detected during the APAM analyses because
allowable effluent concentrations are significantly greater than detected concentrations. In
addition, for these other inorganic parameters, the detections were also below the water
quality standards.
•
•
Bromodichloromethane, bromoform, chloroform, and dibromochloromethane were all
detected at concentrations less than 50 ug/1 during the 1995 APAM sampling event. At
those concentrations, it is expected that these four compounds originated from formation of
chlorine with organic matter (i.e.are likely disinfection by-products). All four of these
compounds are carcinogens, yet monitoring will not be required for the following two
reasons:
1) Concentrations detected were below federal criteria, and
2) None of the four compounds were detected during most recent APAM sampling event.
The APAM will no longer be required in the NPDES permit.
Instream Monitoring
Review of instream data from January 1995 through May 1997 indicates that the discharge
generally does not appear to be having an adverse impact on the receiving stream. There
are a few instances (5/21,22/96 and 8/19-21/96) where fecal coliform may have had an
adverse impact on the stream. The facility is conducting instream monitoring for dissolved
oxygen although is not required.
Compliance Summary
On October 1, 1996, the SOC expired and the final limits for Pilot Mountain became
effective. Review of compliance data for the period May 1996 - March 1997 indicated the
following violations: NH3N monthly average violations (9/96, 10/96), TSS monthly
average violations (8/96, 11/96), TSS weekly average violation (9/16-20), BOD weekly
average violation (1/6-10), fecal coliform weekly average violations (8/19-23, 11/4-8) and
fecal coliform daily maximum violation (10/1/96).
The facility has passed the majority of its toxicity tests (Chronic), but most recently failed
in July 1996.
Average flows at the treatment facility indicate they are operating under a permitted flow of
1.5 MGD.
Proposed Schedule for Permit Issuance
Draft Permit to Public Notice: 7
Permit Scheduled to Issue: .
This permit should not expire until June 30, 1999 according to the basin
plan, but it is currently scheduled to expire January 31,. 1998. 9/22/97 - D.
Goodrich gave approval to notice under existing schedule.

Special Condition I = Engineering Alternatives Analysis Condition has been eliminated
because it is incorporated into another section of the permit.:
. . : :YnICJ ..:. ..
If you have any questions`oany�ouf the above information or on the attached permit, please
contact Paul Clark at [phone], extension 580.
Copies of the following are attached to provide further information on
permit development:
1. Compliance data •
2. Reasonable potential.: analysis,
3. Existing permit effluent -sheets, and
4. Proposed draft permit.
Special Schedule Requirements and additional comments from Reviewers:
Recommended by: Date:
Reviewed by
Regional Supervisor: • �G Y Date:
NPDES Unit Supervisor: Date:

3 L# (<U:
NC0026646' Summary
July 25'� 1997
August , 27;= -1997 (revised)
Town of Pilot Mountain has applied to renew their permit to discharge 1.5/3.0 MGD
treated wastewater.
e treatment system consists of an influent pump station, grit chamber, lint screening uni
chemical addition, oxidation ditch, two clarifiers, chlorination, step reaeration, an aerated
• sludge holding unit and vacuum drying beds.
of July 1996, the outfall was relocated to Ararat River (Class C) in the Yadkin -Pee Dee
River asin (sub -basin 030703). This permit should not expire until , 11 30 qg
1 according to the basin plan, but in reality it expires January 31, 1998.,. d
rE /' 1 i 7 .S uomi" t/J1c - `Y _ -
Industries (all SIUs) discharging to Pilot Mountain WWTP include:
/207--3
1. Wellington Leisure Products: product - rope products, rm: polypropylene,`
polyethylene, PVC homopolymer, wwc - BOD, TSS, NHS-N, COD, Cu, Zn, Ni, Hg. 1,444 ,
2. Intex Corp.: product fabric finishing, rm: see application, wwc - BOD, TSS, NHS-3, /
Cu, Zn, Ni, Hg. "
3. Armtex Corp: product - cotton, cotton polyester, acrylic yarn, dye, chemicals,
polyester, wwc - information not provided.
SIU: Significant Industrial User
To be classified as a SIU, an industry must meet one or more of the following conditions:
1) Flow to POTW > 25,000 GPD
2) Flow to POTW > 5% of POTW's Maximum Allowable Headworks Loading WAHL )
3) Industry is a classified Categorical Industry (CI)
4) Other - an industry may not meet nos. 1-3 listed above, but if there is a concern that the
industry may adversely impact the POTW, it can be classified as a SIU and thus a
pretreatment permit is required.
Only the SIU dischargers have pretreatment permits.
Compliance Summary
On October 1, 1996, the SOC expired and the final limits for Pilot Mountain became
effective. Review of compliance data for the period May 1996 - March 1997 indicated the
following violations: NH3N monthly average violations (9/96, 10/96), TSS monthly
average violations (8/96, 11/96), TSS weekly average violation (9/16-20), BOD weekly
average violation (1/6-10), fecal coliform weekly average violations (8/19-23, 11/4-8) and
fecal coliform daily maximum violation (10/1/96).
- The facility has passed the majority of its toxicity tests (Chronic), but most recently failed
in July 1996. - -
Average flows at the treatment facility indicate they are operating under a permitted flow of
1.5 MGD.
Instream Monitoring
Review of instream data from January 1995 through May 1997 indicates that the discharge
does not appear to be having an adverse impact on the receiving stream. There are a few
instances (5/21,22/96 and 8/19-21/96) where fecal coliform may Have had an adverse
k impact on the stream. The facility is conducting instream monitoring for dissolved oxygen
although is not required.
Page 1 of if,

NC0026646 := Summary
July 25, 1997 •
August 27, 1997 (revised)
WLA Summary
BOD and TSS are effluent limited and will remain unchanged in the proposed permit.
The ammonia toxicity mass balance calculation using S7Q10 and permitted flows indicated
that the ammonia limits will also remain unchanged from the previous permit period: 28.6
(summer at 1.5 MGD) and 15.0 mg/1(summer at 3.0 MGD) and no limits in the
winter.
The chlorine toxicity mass balance calculation using S7Q 10 and permitted flows indicated
very high chlorine limits and thus the cap of 28 ug/1 will remain unchanged in the permit.
Total nitrogen effluent concentrations ranged from about 5-14 mg/1 and total phosphorus
effluent concentrations ranged from 2-5 mg/1, but the treatment system does not discharge
into a nutrient limited stream. Thus, these concentrations are not expected to adversely
impact the receiving stream.
Recommend the temperature footnote be eliminated from the permit because
• this is not a thermal discharge.
The reasonable potential analysis was conducted for 1.5 and 3.0 MGD and results can be
summarized as follows:
Nam a 1 a Nii
NOl.frof0 Detects
; I.5 .MGD. :
-3.0 -MGD_
Cadmium
4 out of 31
MPC>AEC
MPC>AEC
Chromium
23 out of 31
MPC<AEC
MPC<AEC
Copper
24 out of 24
MPC>AEC
MPC>AEC
Cyanide
9 out of 32
MPC>AEC
MPC>AEC
Lead
9 out of 31
MPC<AEC
MPC<AEC
Mercury
0 out of 31
MPC<AEC
MPC<AEC
Nickel
3 out of 31
MPC<AEC
MPC<AEC
Silver
7 out of 23
MPC>AEC
MPC>AEC
Zinc
23 out of 23
MPC<AEC
MPC<AEC
1v1t'L:: maximum predicted concentration
AEC: allowable effluent concentration
Those parameters indicated in bold will be limited. The Long Term Monitoring Plan
(LTMP) requires monitoring for all of the parameters listed in the above table. Monitoring
(but no limit) will be required for copper and silver. Although the MPC exceeded the AEC
for these two parameters, they do not have water quality standards, only action levels.
The Pretreatment Allocation table indicates that copper, cyanide, lead, and zinc are expected
to be discharged from the three industries which discharge to Pilot Mountain WWTP.
Pretreatment is investigating the source of cadmium.
Page 2 of

NC0026646 Summary
July 25, 1997 •
August 27, 1997 (revised)
1995 and 1996 APAM data were reviewed. Parameters in summary table include those:
(1) above the detection limit, and (2) for which monitoring is not required in either the
NPDES permit or the pretreatment permit (LIMP).
Name
-10/9
11 ' 6 i
WjQ}; Stc1 o .
riterY
.
'AEC/15MGD
AEC/3.0MGD'
��i
Y. - x
Aluminum
310
590
acute 750
chronic 87
chronic 3163
chronic 1625
Antimony
46
245
4300 OC
not calculated •
not calculated
Arsenic
BDL
194
50 aql
1818
9.33
Selenium
4.2
175
5 aql
182
93
Barium
35
39
2000 MCL
not calculated
not calculated
Chloride
62000
52100
'
acute860000
chronic230000
not calculated .
not calculated
Fluoride
950
730
1800 aql
not calculated
not calculated
Bromodichlo
romethane
23.2
BDL
22,46q
not calculated
not calculated
Bromoform
1.2
BDL
360
not calculated
not calculated
Chloroform
23.4
BDL
34
not calculated
not calculated
Dibromochlo
romethane
10.6
BDL
470
not calculated
not calculated
: Avowable tttluent Concentration OC: Organism Consumption
BDL: Below Detection Level aql: aquatic life criteria
MCL: Maximum Contaminant Level
q: Value determined after federal criteria published, or new cancer potency slope factor
All concentrations are in ug/1 unless indicated otherwise.
Selenium monitoring will be required (but not limited) because the 1996 detection was
greater than the allowable effluent concentration at 3.0 MGD. Although the arsenic
detection was well below the allowable effluent concentrations at both 1.5 and 3.0 MGD,
its concentration was well above the water quality standard. Thus, it is consideered a
pollutant of concern and monitoring (but no limit) will be required. Monitoring will not be
required for any other inorganic parameters detected during the APAM analyses because
allowable effluent concentrations are significantly greater than detected concentrations. In
addition, for these other inorganic parameters, the detections were also below the water
quality standards.
Bromodichloromethane, bromoform, chloroform, and dibromochloromethane were all
detected at concentrations less than 50 ug/1 during the 1995 APAM sampling event. At -
those concentrations, it is expected that these four compounds originated from formation of
chlorine with organic matter (i.e.are likely disinfection by-products). All four of these
compounds are carcinogens, yet monitoring will not be required for the following two
reasons:
1) Concentrations detected were below federal criteria, and
2) None of the four compounds were detected during most recent APAM sampling event.
The APAM will no longer be required in the NPDES permit.
Page 3 of idi#

Town of Pilot Mountain
NC0026646
Qeff=1.5 MGD
Qeff=3.0 MGD
Residual Chlorine
7Q10 (CFS)
DESIGN FLOW (MGD)
DESIGN FLOW (MGD)
DESIGN FLOW (CFS)
DESIGN FLOW (CFS)
STREAM STD (UG/L)
UPS BACKGROUND LEVEL (UG/L)
IWC (%)
Allowable Concentration (ug/l)
Allowable Concentration (ug/l) .
Fecal Limit
Dilution=7Q10S/DESIGN FLOW
Dilution=
Dilution < 67, thus fecal limit
82.2
1.5
3
2.325
4.65 •
17.0
0
2.75
618.03
317.52
200 mg/1
35.4
Ammonia as NH3
(summer)
7010 (CFS)
DESIGN FLOW (MGD)
DESIGN FLOW (MGD)
DESIGN FLOW (CFS)
DESIGN FLOW (CFS)
STREAM STD (MG/L)
UPS BACKGROUND LEVEL (MG/L)
IWC (%)
Allowable Concentration (mg/I)
Allowable Concentration (mg/I)
Ammonia as NH3
(winter)
7Q10 (CFS)
DESIGN FLOW (MGD)
DESIGN FLOW (MGD)
DESIGN FLOW (CFS)
DESIGN FLOW (CFS)
STREAM STD (MG/L)
UPS BACKGROUND LEVEL (MG/L)
IWC (%)
Allowable Concentration (mg/I)
Allowable Concentration (mg/1)
•
82.2
1.5
3
2.325
4.65
1.0
0.22
2.75
28.58
14.79
163
1.5
3
2.325
4.65
1.8 .
0.22
1.41
112.57
57.18
7/25/97

Pilot Mountain, Town of
NC0026646
Qeff=1.5 MGD
Qeff=3.0 MGD
Aluminum
7Q10 (CFS)
DESIGN FLOW (MGD)
DESIGN FLOW (MGD)
DESIGN FLOW (CFS)
DESIGN FLOW (CFS)
STREAM STD (UG/L)
UPS BACKGROUND LEVEL (UG/L)
IWC (%)
Allowable Concentration (ug/I)
Allowable Concentration (ug/I)
82.2
1.5
3
2.325
4.65
87.0
0
2.75
3162.87
1624.94
Selenium
7Q10 (CFS)
DESIGN FLOW (MGD)
DESIGN FLOW (MGD)
DESIGN FLOW (CFS)
DESIGN FLOW (CFS)
STREAM STD (MG/L)
UPS BACKGROUND LEVEL (MG/L)
IWC (%)
Allowable Concentration (mg/I)
Allowable Concentration (mg/I)
Arsenic
7Q10 (CFS)
DESIGN FLOW (MGD)
DESIGN FLOW (MGD)
DESIGN FLOW (CFS)
DESIGN FLOW (CFS)
STREAM STD (MG/L)
UPS BACKGROUND LEVEL (MG/L)
IWC (%)
Allowable Concentration (mg/I)
Allowable Concentration (mg/I)
82.2
1.5
3
2.325
4.65
5.0
0
2.75
181.77
93.39
82.2 •
1.5
3
2.325
4.65
50.0
0
2.75
1817.74
933.87
7/25/97