NC0000311_Memo_19800204

114 -1
North Carolina Department of Natural
Resources &Community Development
James B. Hunt,Jr., Governor Howard N. Lee, Secretary
DIVISION OF ENVIRONMENTAL MANAGEMENT
February 4, 1980
M E M O R A N D U M
TO: Gary Tweed, Environmental Engineer
Asheville Regional Office
THRU: Forrest Westall , Head
Technical Services Branch
FROM: Mark Castleberry, Environmental Engineer
Technical Services Branch
SUBJECT: Copper and Zinc Limits for M-B Industries
There are no North Carolina numerical water quality standards for copper and
zinc at this time. They, however, are covered by Section .0208 of Title 15
Chapter 2. This section states "the concentration of toxic substances in the
receiving water, when not specified elsewhere in this section, shall not
exceed one-one hundredth (0.01) of the 96-hour LC50".
The Biological Monitoring Group of Technical Services is planning to run
bioassey tests to determine the 96-hour LC50 for copper and zinc. These
tests will probably be run this spring.
Presently, we are recommending that permits with copper or zinc limits-use
the BPT value with the stipulation that the limits are subject to revision
once the 96-hour LC50 concentrations are determined.
If you have any further questions on this matter, please let us know.
P.O.Sox 27687 Raleigh,North Carolina 27611
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