NC0083887_Staff Comments_19961105

DIVISION OF WATER QUALITY/NPDES
November 5, 1996
MEMORANDUM
To: Permits & Engineering File
NPDES Permit No. NC0083887
Through: Dave Goodrich 174
From: Steven Pellei 919 733-5083 extension 516
Subject: Charlotte Douglas International Airport
NPDES Permit No. NC0083887
Mecklenburg County
As discussed with Kristie Robeson and Matt Matthews, at the next renewal for this permit, outfalls
002 and 003 shall be redesignated as instream sampling points. Currently 002 and 003 are designated
as outfalls, which implies end of pipe discharge points. However, theses sites are actually instream
monitoring points testing for various parameters (i.e.: de-icing agents) after mixing with stormwater
and stream water.
Since they can be considered instream points, no toxicity tests will be required for 002,003, and 004.
This change should be reflected in the Supplemental Page, the Map and on the respective Effluent
Pages to the Permit.
cc: Matt Matthews/Water Quality Lab

DIVISION"OF WATER QtmUrrY
October 18, 1996
MEMORANDUM
TO: Dave Goodrich
THROUGH: Matt Matthews f" M
FROM: Kristie Robeson
SUBJECT: Permit Modification
Charlotte/Douglas International Airport
NPDES Permit No. NCO083887
Mecklenburg County
By cover letter dated August 29, 1996, the facility was issued NPDES Permit No.
NCO083887 with an effective date of October 1, 1996, and expiration date of August 31,
2001. Upon review of the toxicity language contained in the permit, it was noted that the
permit reflects toxicity testing to be conducted only on outfall 001.
This office recommends modification of this permit to include toxicity testing to be
conducted for outfalls 002, 003, and 004, The effluent limits pages of the permit indicate
de-icing compounds as a possible component of these three wastestreams. As previously
stated in our response to the draft permit for this facility, toxicity of de-icing compounds is
well documented and we would strongly support toxicity monitoring at these outfalls. Our
office contacted the Mooresville Regional Office on this issue and they concur with our
recommendation. The toxicity language contained in Part II, Section C: Special
Conditions, (3) that was applied for outfall 001 should also be used for outfalls 002, 003,
and 004.
Our office appreciates your assistance to undertake the necessary steps to modify
the existing permit and incorporate the recommendations cited above. Should you have any
questions, please feel free to contact me at 2136.
cc: Mooresville Regional Office
Steve Pellei-Permits and Engineering NPDES Group
Larry Ansley
Central Files
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