NC0039586_Duke Power McGuire Plant Chemical Release_19831109

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From:
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.�, North Carolina Department of Environment
Health and Natural Resources

DIVISION OF ENVIRONMENTAL MANAGEMENT
tbvember 9, 1983
MEMORANDUM
TO: Forrest Westall
FROM: Randy Dodd �Ca�
THROUGH: Randy Williams F
Steve Tedder
SUBJECT: Duke Power McGuire Plant Chemical Release
Over the course of the past several months, Duke Power has been
interacting with DEM in an attempt to define administrative limits for
releases of boron, ethylene glycol, and AydEazine from the McGuire
Nuclear Plant on Lake. Norman. In their•most recent correspondence, Duke
Power proposed in-stream,�,limits of 1 ppm for ethylene glycol, 0.43 ppm
for hydrazine, and 0.�ypm for boron, based on a literature survey and
bioassay results. In a meeting_.,with Steve Tedder and Ken Eagleson,. the
;following issues were raised:
1. The hydrazine.in-stream limit was based on a literature value;_
bioassay results indicate that the 96 hr. LC50 for the fathead
minnow was 6.36 ppm, and the 48 hr. EC50 for daphnids was 0.16
ppm and 0.19 ppm (tuO tests). Duke's proposed limits, therefore,
do not address the chronic toxicity of hydrazine. In addition,
this limit is, above the EC50 for daphnids. It is proposed that a
value of 0.06 ppm be used for an administrative limit, in accor=
dance with Section .0208 of the Water Quality Regulations: This
value is one one-hundreth of the 96 hr. LC50.
2. EPA recommends an in -stream level of 0.75 ppm of boron to
protect sensitive crops which may use receiving waters for
irrigation purposes. .Duke Power is proposing an administrative
in -stream limit of 12 ppm. They have obtained documentation
stating that the receiving waters are currently not being used
to any significant extent for irrigation, and -the 0.75 ppm limit
is, therefore, not applicable. It is our contention that.
Section -.0211 specifies that the receiving waters are required -to
be suitable for irrigation, regardless of whether they bre currently
being used for this purpose.
I have attached a draft letter to be sent to Duke Power stating
these observations.
RD:cs
cc: Bill Mills
Ken Eagleson