NC0026913_staff comments_19940824

MEMORANDUM
DIVISION OF ENVIRONMENTAL MANAGEMENT
To: Kent Wiggins
August 24, 1994
for Lfr
Thru: Larry Ausley i"'n`
Matt Matthews ('^
From: Kevin Bowden Kg
SUBJECT: Town of Sparta Toxicity Monitoring Requitement
SOCEMCWQ93-13AD ,`�
NPDES Permit No. NC0026913
Alleghany County
The Town of Sparta was issued an amendment to SOC EMC WQ 93-13 effective 7/18/94.
The Town's NPDES Permit was reissued June 30, 1994, with an effective date of August 1,
1994. The reissued NPDES Permit contains a quarterly chronic toxicity limitation of 9.0% which
becomes effective upon expansion above .25 MGD and lasting until permit expiration. Prior to
expansion the facility's IWC is 5.5%. This office previously provided comments to the Winston-
Salem Regional Office regarding toxicity condition language found in Attachment B of the Order.
Several corrections noted below have been made to Attachment B.
1. Testing months have been altered from a quarterly schedule of
January, April, July, and October to a quarterly schedule of March,
June, September, and December to coincide with testing months
specified by the reissued NPDES Permit.
2. Language specifying when the first test is due has been deleted.
New language has been included which states, "Toxicity
monitoring shall be conducted during the months of March, June,
September, and December."
3. A revision to the paragraph addressing potential impacts to the
receiving stream has been revised to read, "Should any test data...,
then the NPDES Permit may be reopened..."
We would recommend the revised Attachment B be transmitted to the Town with
instructions to discard the previous Attachment B and to insert the new page.
I appreciate your assistance and should you have any questions, please contact me at
-2136.
cc: Steve Tedder
Steve Mauney/Winston-Salem Regional Office
Dave Goodrich
Jackie Nowell
Aquatic Toxicology Unit Files
Central Files

Town of Sparta
NPDES Permit No. NC0026913
ATTACHMENT B
CHRONIC TOXICITY MONITORING (QRTRLY)
The permittee shall conduct chronic toxicity tests using test procedures outlined in:
1.) The North Carolina Ceriodaphnia chronic effluent bioassay procedure (North Carolina Chronic
Bioassay Procedure - Revised *September 1989) or subsequent versions.
The effluent concentration defined as treatment two in the North Carolina procedure document is
6.0%. The permit holder shall perform quarterly monitoring using this procedure to establish
compliance with the Order conditions. Toxicity monitoring shall be conducted during the months
of March, June, September, and December. Effluent sampling for this testing shall be performed
at the NPDES permitted fmal 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, DEM Form AT-1 (original) is to be sent to the following address:
Attention: Environmental Sciences Branch
North Carolina Division of
Environmental Management
4401 Reedy Creek Rd.
Raleigh, N.C. 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 any single quarterly monitoring indicate a test failure, 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 Environmental Management indicate potential impacts to the receiving stream, then the
NPDES 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 and appropriate environmental controls, shall constitute an invalid test
and will require immediate retesting(within 30 days of initial monitoring event). Failure to submit
suitable test results will constitute noncompliance with monitoring requirements.