NC0004961_Study Plan_19880825

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State of North Carolina
Department of Natural Resources and Community Development
Division o� Environmental Management
512 North Salisbury Street 0 Raleigh, North Carolina 27611
James G Martin, Governor R Paul Wilms
S Thomas Rhodes, Secretary August 25, 1988 Director
Dui e. Powol- Company
Fossil Production Department
Atte: Mr. Ralph C. Roberts
P.O. I3ox 33189
422 South Church Street
Charlotte, N C. 28242
E: RI-VOrbend Water Quality
Study PI an
Dear Mr. Robex rs :
1 lie Watt r Qua tit.y Section of t he Division o E Environmental
Management has rezaived and reviewed the water qua Li t- study plan dated
8/23/88 relating to the Riverbend facility.
The Section concurs with the study plan submitted. As the study
proceeds, please contact myself at [phone] if questions arise.
SWT/gh
incereLy,
Steve W. Tedder, Assistant Chief
Technical_ Services Branch
PO Box 27687, Raleigh, North Carolina 27611-7687 Telephone [phone]
An Equal Opporumty Affirmative Action Employer

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August 23, 1988
Mr. Steve Tedder
NC Dept. of Natural Resources and
Community Development
Division of Environmental Management
512 North Salisbury Street
Raleigh, North Carolina 27611-7681
Subject: Riverbend NPDES Permit
File: RB -704.10
Dear Mr. Tedder:
This letter outlines a study plan for Mt. Island Lake, to assess the impact
of the Riverbend ash basin from both surface and subsurface sources, as
required in the NPDES permit modification dated March 29, 1988. The
following plan is revised from the plan submitted in May and incorporates
DEM's comments to the earlier plan:
I. Water Column Sampling
A. Parametric Coverage - Attachment (I) lists the parameters to
be studied and elemental analyses to be performed. All
parameters DEM listed as high or low interest are included.
B. Frequency - Two sampling runs during the 1988 growing
season; one in early August, one in mid-September.
C. Spatial Coverage - Sampling depths shall be performed as
indicated in Attachment (I). A specific conductance
transect shall be run across the river at each sampling
location. This will be used to determine horizontal and
vertical variability in case of incomplete mixing and to
help determine the water column sampling location.
Attachment (II) is a map showing the sampling locations.
D. Flow Considerations - Sampling will be conducted at low
flow periods if possible. Flow data frpm Mt. Island and
Cowans Ford Dams will be provided.
1I. Sediment - Core samples will be collected at locations 275.0,
16.0, upstream and downstream from the ash basin discharge (see
Attachment II). They will be analyzed by NAA at North Carolina
State University for As, Hg, Cu, Cd, Se, and Ni. Sampling will
be done in August only, with a minimum of three replicates.
III. Fish Tissue - Fish tissue sampling will be performed at the same
locations as for sediments and analyzed for the same parameters
except copper. Fish tissue sampling will be done one time during
the 1988 growing season.

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Mr. Steve Tedder
August 23, 1988
If you have any questions or comments, please call me at [phone].
Sincerel
a�
Ralph C. Roberts
Fossil Production Engineer
Fossil Environmental Compliance
RCR/tb
cc: B. K. Sipe
E. L. Kruger
T. L. Whisenant

ATTACHMENT I
Riverbend Steam Station Ash Basin
Catawba River Water Quality Monitoring
Parameters
Temperature
Dissolved Oxygen
pH
Specific Conductance
Cadmium
Calcium
Copper
Iron
Lead
Magnesium
Manganese
Potassium
Sodium
Zinc
Arsenic
Selenium
Chromium
Barium
Sulfate
Hardness
Silica
Nickel
Mercury
Alkalinity
Total Suspended Solids
Total Solids
Sample Locations and Depths
16 Above Ash Below Ash 277.3 277.0
Basin Basin
In -Situ Analyses
In-situ measurements are collected at all locations at
1-m intervals from surface (0.3 m) to 1-m above the
bottom.
Elemental Analvses
Elemental analyses will be completed for surface and
bottom (1-m above bottom, except surface only: Hg) water
samples during August and September. Undigested water
samples are analyzed using atomic emission spectroscopy
(ICP -AES), or Cold Vapor based on most appropriate
methodology for concentration ranges. Based on low
turbidity levels anticipated, digestion of samples for
trace element analyses will not be necessary.

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ATTACHMENT II
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