NC0041696_Staff Comments_20040521

NPDES DOCUHENT SCANNING COVER SHEET
NPDES Permit:
NC0041696
Lake Rhodhiss WWTP
Document Type:
Permit Issuance
Wasteload Allocation
Authorization to Construct (AtC)
Permit Modification
Complete File - Historical
Engineering Alternatives (EAA)
Staff Comments.':.
T r�„•
Instream Assessment (67b)
Speculative Limits
Environmental Assessment (EA)
Document Date:
May 21, 2004
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State of North Carolina
Department of Environment
and Natural Resources
Michael F. Easley, Governor
Alan W. Klimek, P.E., Director
Coleen H. Sullins, Deputy Director
Division of Water Quality
Asheville Regional Office
MEMORANDUM
TO: Dave Goodrich
NPDES Permit Unit
G
wAlrrA
NCDENR
NORTH CAROLINA DEPARTMENT OF
("\- ICirik AV
May 21, 2004
Point Source Compliance/Enforcement Unit
FROM: Jim Rei
ARO
SUBJECT: Town of Valdese — NC0041696
NPDES Permit Unit
Burke County
ENVIRONMENT AND NATURAL RESOURCES
In accordance with attached documentation, please note that the monitoring requirement in BIMS for subject
facility is incorrect. THE TOWN OF VALDESE IS NOT REQUIRED TO MONITOR FOR MERCURY.
Every month, BIMS calculates subject facility to be in violation of its monitoring requirement for mercury.
Sporadically, for two years, I have entered "BIMS calculation error" in response to the erroneous mercury
monitoring "violation". To date, the information in BIMS has not been updated.
Your assistance in remedying this error would be appreciated. Please contact me if there are questions or a need
for additional information.
Xc: Forrest Westall
Asheville Regional Office, 2090 U.S. 70 Highway, Swannanoa, North Carolina 28778 Phone: [phone] Fax: [phone]
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State of North Carolina
Department of Environmen.
and Natural Resources
Division of Water Quality
Michael F. Easley, Governor
William G. Ross, Jr., Secretary
Gregory J. Thorpe, Ph. D, Acting Director
FA
NCDENR
May 31, 2002
Mr. Jeffrey V. Morse, Town Manager
Town of Valdese
P.O. Box 339
Valdese, North Carolina 28690-0339
Subject: NPDES Permit Modification
Permit No. NC0041696
Town of Valdese — Lake Rhodhiss WWTP
Burke County
Dear Mr. Morse:
In accordance with your request for a re-evaluation of the effluent limitation and monitoring for
mercury as in the current NPDES discharge permit, staff has reviewed the data submitted in the March 5,
2002 letter. A statistical analysis of the data was performed to determine the potential for exceedance of
the instream water quality standard for mercury. The results indicated that there was no potential for the
standard to be violated based on the data. Therefore, the NPDES Unit is recommending that the effluent
limitation and monitoring requirement for mercury be removed from the Valdese permit. Mercury data
will still be collected through the facility's pretreatment program and will be evaluated upon permit
renewal in 2005.
The Town of Valdese should be aware that mercury continues to be a water quality concern
throughout North Carolina. Holders of NPDES permits have worked with the state to reduce potential
risks from this pollutant, including tasks associated with collecting and reporting more accurate data.
The most commonly used laboratory analysis (EPA Method 245.1) has a detection limit of 0.2 ug/L
while the current water quality standard is an order of magnitude lower at 0.012 ug/L. A more recently
approved analytical test (EPA Method 1631) should produce a detection limit below the level of the
standard. This will allow the Division to assess potential water quality impacts from discharges more
accurately. Therefore, beginning on or before September 1, 2003, you will be required to begin using
EPA Method 1631 when analyzing for mercury.
Accordingly, we are forwarding herewith these modifications to the subject permit. Please find
enclosed the amended effluent pages for outfall 001, which should be inserted into your permit. The old
pages should be discarded. 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.
1617 Mail Service Center, Raleigh, North Carolina 27699-1617 Telephone [phone] FAX [phone]
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F , . •
j mit No. NC0041696
Valdese WWTp
May 31, 2002
Page 2
tkvi
unacceptable any
t parts, measurement frequencies or sampling requirements contained
P o you, you have the right to an adjudicatory hearing upon written inthispermit are
(30) days following receipt of this letter. ,This request mustquest within
conforming to Chapter I SOB of the North Carolina General Statutes,in the form of a written petition
Administrative Hearings, 6714 Mail Service Center, Raleigh, North and filed with the office of
a demand is made, this permit shall be final and binding.
g ' Carolina 27699-6714. Unless such
g
Please take notice that this permit is not transferable. Part II E.
be followed in case of change in ownership or control of this discharge.
addresses the requirements to
.
If you have any questions or need additional information leas
telephone number [phone], extension 512. p e contact Jacquelyn M. Nowell at
Attachment
cc: Central Files
EPA Region IV/Roosevelt Childress
Asheville Regional Office
NPDES Unit
Point Source Compliance/Enforcement Unit
Sincerely,
‘6k,
cox_Gregory J. Thorpe, Ph.D

0
A (1). EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS
NNN
Permit No. NC0041696.
During the period beginning on the effective date of the permit and lasting until expansion to 10.5 MGD or 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
Location'
Flow
7.5 MGD
Continuous
Recording
I or E
BOD5 2
30.0 mg/I
45.0 mg/1
Daily
Composite
E,1
Total Suspended Solids2
30.0 mg/1
45.0 mg/I
Daily
Composite
E,1
NH3-N
Weekly
Composite
E
Dissolved Oxygen
Daily
Grab
E
Dissolved Oxygen (June 1 through September 30)
3/Week
Grab
U,D
Dissolved Oxygen (October 1 through May 31)
Weekly
Grab
U,D 1
Fecal Coliform (geometric mean)
200/100 ml
400/100 mI
Daily
Grab
E
, pH3
Daily
Grab
E
Phenols
21 µg/i
2/month
Grab
E
Copper
Monthly
Grab
E
Total Residual Chlorine
Daily
Grab
E
Temperature (June 1 through September 30)
3/Week
Grab
U,D
Temperature (October 1 through May 31)
Weekly
Grab
U,D
Total Nitrogen (NO2 + NO3 + TKN)
Monthly
Composite
E
Total Phosphorus
Monthly
Composite
E
Chronic Toxicity's
Quarterly
Composite
E
Notes:
1. Sample Locations: E - Effluent, I — Influent , U - Upstream at least 100 feet, D — Downstream 1 mile below discharge at SR 1001. Upstream and downstream samples shall be grab
samples. Stream samples shall be collected three times per week during June, July, August, and September and once per week during the remaining months of the year.
2. The monthly average effluent BOD5 and Total Suspended Residue concentrations shall not exceed 15% of the respective influent value (85% removal).
3. The pH shall not be less than 6.0 standard units nor greater than 9.0 standard units.
4. Chronic Toxicity (Ceriodaphnia) P/F @ 4.8%; January, April, July, October. See Special Conditions of the Supplement to Effluent Limitations A (4).
There shall be no discharge of floating solids or visible foam in other than trace amounts.