NC0004961_NC0004961_Study Plan_19880524_19880524

DUKE POWER COMPANY
FOSSIL PRODUCTION DEPARTMENT
P.O. Box 33189, 422 SOUTH CHURCH STREET
GHARLOTTE, N.C. 28242
[phone]
May 24, 1988
Mr. Randall C. Dodd
North Carolina Department of Natural Resources
and Community Development
Division of Environmental Management
Archdale Building
512 North Salisbury Street
Raleigh, North Carolina 27611-7687
Subject: Riverbend NPDES Permit
File: RB -704.10
Dear Mr. Dodd:
',IJV �i r
This letter outlines a study plan as required in the NPDES permit
modification dated March 29, 1988. The study will further define
the assimilative capacity of the Catawba River for pollutants
potentially reaching the river. It will also assess the impact of
the ash basin from both surface and subsurface sources.
Attachment (I) lists the parameters to be studied and elemental
analyses to be performed. Attachment (II) is a map showing the
sampling locations.
The following provides some more specifics on the sampling program,
some of the study design considerations and response to DEM comments
dated May 4, 1988:
I. Water Column Sampling
A. Parametric Coverage - The parameters selected for
analysis will indicate any impact to the Catawba River
from the ash basin. The majority of parameters DEM
listed as high priority are included. Nickel and
Mercury were not included because previous analysis
indicated they are found in only very low concentra-
tions in ash leachate (see Attachment III). Several
parameters DEM listed as a low priority, such as
calcium and sulfate, are included because previous
studies have shown they would represent the leading
edge of the chemical plume.
B. Frequency - One sampling run in August, one in February.

Mr. Randall C. Dodd
Division of Environmental Management
May 24, 1988
Page 2
C. Spatial Coverage - 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.
D. Flow Consideration - Sampling will be conducted at low flow
periods if possible. Flow data from the Mt. Island and
Cowans Ford Dams will be provided.
II. Sediment - Sediment sampling has not been included in this
study plan. Significant chemical concentrations in the
sediment would be expected to produce elevated levels in the
water column samples and sediment sampling would, therefore,
be unnecessary.
III. Fish Tissue - Fish tissue sampling has not been included
in this study plan. Chemical concentrations in the river
determined from previous studies (see Attachment IV) do
not justify fish tissue sampling. Problems with control
populations and isolating the analysis to the impact from
the ash pond make it impractical. Also toxicity monitoring
of the ash pond effluent is already being performed as part
of the permit requirements.
If you have any questions or comments, please call me at [phone].
Sincerely,
'-Ra-� C
Ralph C. Roberts/mg
Fossil Environmental Compliance
cc: Steve Tedder
B. K. Sipe
E. L. Kruger

ATTACHMENT I
Riverbend Steam Station Ash Basin
Catawba River Water Duality Monitoring
Sample Locations and Depths
278.0 Above Ash Below Ash 277.3 277.0
Parameters Basin Basin
In -Situ Analyses
Temperature In-situ measurements are collected semiannually at all
Dissolved Oxygen locations at 1-m intervals from surface (0.3 m) to 1-m
pH above the bottom.
Specific Conductance
Elemental Analyses
Silver
Elemental analyses will be completed for surface and
Cadmium
bottom (1-m above bottom) water samples semiannually.
Calcium
Undigested water samples are analyzed using
Copper
an inductively coupled plasma atomic
Iron
emission spectroscopy (ICP -AES) unit. Analysis
Lead
for lead, arsenic, and selenium will be completed
Magnesium
using graphite furnace atomic absorption
Manganese
spectroscopy. Based on low turbidity levels
Potassium
anticipated and conversations with EPA Region IV,
Sodium
digestion of samples for trace element analyses
Zinc
will not be necessary.
Arsenic
Selenium
Chromium
Barium
Sulfate
Hardness

ATTACHMENT II
JRFACE DISCHAR(
SURFACE DISCHAI

ATTACHMENT III
T'
TABLE 6 ci
Concentration of Selected Metals in Leachate Extracted From
Ash Samples Through the Use of the EPA Extraction Procedure""�'
and EPA Toxicity Criterion Limits for Solid Wastes Under the
Resource Conservation and Recovery Act. (From Roche, Gnilka,
and Marwood, 1984, Table 1 and p. 3). (All concentrations in
parts per billion.)
Riverbend
Constituent
Allen
Cell
Cell
EPA Toxicity
Criterion
Arsenic
51
82
75
5000
Barium
1200
1100
1300
1000
Cadmium
<25
<25
<25
100,000
Chromium
10
20
60
1000
Lead
<500
<500
<500
5000
Mercury
0.11
<0.1
<0.1
5000
Selenium
<6
<6
<6
200
Silver
150
30
40
5000
, / n
< 0.05
Strontium
8.85-33.1
1 v 1 CSX
0.141-0.166
0.241-0.274
Vanadium
TABLE 7
Selected Chemical Analyses From the Allen Plant Related to Ash -pond Seepage. (From Arthur
D. Little, Inc., 1985, Table 5.3.) (All constituents in mg/1 except arsenic which is in µg/1.)
Ash solids
Groundwater
Groundwater
EPA Drinking
Saprolite (Wells 3-2,
up Gradient
in Plume
Water
Constituent (Well 3-4) 3-3)
(Well 3-4B)
(Well 3-2)
Standards)
Calcium
471-4056
2251-4578
9.95-10.9
15.8-17
Sulfate
2.1
1.4
250
Arsenic
0.6-1.41
16.2-57.1
< 0.2-7.0
0.057-0.76
50
Boron
< 0.005-0.016
< 0.15-1.6
0.75
Copper
952-17.6
20.8-45.1
< 0.008
< 0.008
1
Iron
11,164-16,558 11,700-29,491
< 0.01
25.9
0.3
Manganese
155-303
83-171
< 0.01-0.07
6.44-14
0.05
Nickel
4.48-10.8
5.3-26.0
< 0.05
< 0.05
Strontium
8.85-33.1
112-239
0.141-0.166
0.241-0.274
Vanadium
28.1-49.1
22.2-41.5
<0.005-0.016
<0.005
Zinc
22.8-36-2
18.5-45.7
<0.05
<0.05
5
ort
ro ina un erground water quality standards are the
same as those of EPA for
arsenic,
iron, and manganese.
No standards
are specified for the other constituents
listed.
2/ EPA criterion for protection of sensitive crops.

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