20070812 Ver 2_Response to More Info Ltr 2_20090317

HUNTON
WELIAMS
March 17, 2009
By Hand
John R. Dorney
Wetland Program Development Unit
Division of Water Quality
Parkview Building
2321 Crabtree Blvd.
Raleigh, North Carolina 27604
TEL 919.899 •3000
FAX 919.833 •6352
HUNTON & WILLIAMS LLP
POST OFFICE BOX 109
RALEIGH. NORTH CAROLINA 27602
CRAIG A. BROMBY
DIRECT DIAL: 919-899-3032
EMAIL: [e-mail]
FILE NO: 65215.6
DOC NO: 26986517
Re: Response to Additional Information Request - Items 1, 5, and 8
401 Water Quality Certification -- APGI Yadkin Project
DWQ #2007-0812 version 2
Davidson, Rowan, Montgomery and Stanly Counties
Dear Mr. Dorney:
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r
Alcoa Power Generating Inc. ("APGI") offers the following responses to items 1, 5 and 8
outlined in the North Carolina Division of Water Quality's ("DWQ") additional information
request ("AIR") letter dated February 24, 2009. The numbered answers below correspond to the
numbered requests in the February 24 letter. APGI's responses to AIR #'s 2, 3, 4, 6 and 7 were
submitted previously by letter dated March 9, 2009. This submittal completes APGI's response
to the February 24 additional information request.
All information used as a basis for providing the response to AIR #1 has been publicly available
and located in the record of this 401 proceeding. In addition, with respect to AIR #5, APGI
notes that Alcoa Inc. ("Alcoa") is a separate corporation from APGI, and the information relating
to the waste sites has been collected by Alcoa Inc., not APGL The information relating to waste
sites at the Alcoa Badin Works site furnished in this response was taken from publicly available
documents already submitted by Alcoa to the Department of Environment and Natural
Resources. In addition, this information may already be in the record of this 401 proceeding.
The remainder of the information provided in this submittal was collected by APGI and, with the
exception of Figure 5, is already in the record of this 401 proceeding. To assist with the review,
we have carefully referenced the sources of each piece of information provided herein.
Once again, APGI reiterates that the record in this matter is presently sufficient for DWQ to
issue the 401, but APGI is providing this information as an accommodation to DWQ. However,
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John R. Dorney
March 17, 2009
Page 2
APGI reserves its right to challenge the necessity and/or the relevancy of some or all of this
information as it deems necessary in the future.
AIR #1 - Dissolved oxygen sag - Commenters from the public hearing have asked whether
sufficient sampling is being done or is being planned (after turbine upgrades) along river
transects below the dams to detect any DO sag which may reduce the effectiveness of turbine
improvements. Please clarify where DO samples were taken and are planned to be taken
downstream of the dams to address this issue.
Summary: Based on significant sampling and analysis over the past several years, there has
never been any phenomenon that remotely resembles a dissolved oxygen (DO) sag downstream
of the Project reservoirs. Furthermore, in the future, DO sampling will be conducted to confirm
improvements in tailwater DO concentrations that result from the planned installation of DO
enhancement technologies in accordance with the schedule outlined in the Relicensing
Settlement Agreement ("RSA").
Any claims that a DO sag occurs downstream of the discharge from Narrows powerhouse are
refuted by the data. Independent consultants, working under DWQ-approved plans, have
conducted numerous studies and monitoring of DO concentrations in the Narrows tailwater area
since 1999, and have never observed conditions that could be characterized as a DO sag. What
follows is an explanation of the DO "sag" phenomenon together with a synopsis of some of those
studies. These materials clearly demonstrate that there is no DO sag, as claimed.
Detailed Response: "DO sag" is a term used to describe a phenomenon that is known to occur
in rivers and streams downstream of a discharge containing oxygen-demanding substances. This
is a common water quality issue associated with point source discharges such as wastewater
treatment plants. A DO sag can occur close to the discharge or several miles downstream of the
discharge, depending on the concentration of pollutants in the discharge, stream flow and other
variables. A DO sag generally results when the pollutants in the discharge take up the oxygen in
the water column as they decompose or undergo chemical alteration. The oxygen "demand"
exerted by these decomposing pollutants is measured as biological oxygen demand (BOD) and
chemical oxygen demand (COD). These are two factors that are commonly measured in
determining the effects of various discharges.
DO sags are not typically associated with hydropower operations for a number of reasons. First,
a hydropower plant, like Narrows Dam, does not "add" any BOD or COD to the water because
the water merely flows through the turbines. The concentration of BOD and COD in the water
being discharged from the dam is the same as that found in the reservoir just upstream of the
dam. Such is the case at Narrows Dam. During the period 1999-2003, monthly measurements
of BOD and COD in the Narrows tailwater were performed. Median BOD concentrations over
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John R. Dorney
March 17, 2009
Page 3
that period were < 2 mg/L (the detection limit), and the 95% exceedance value was 4 mg/1. COD
measurements were similarly very low, with a median concentration of < 20 mg/1 (the detection
limit) and a 95% exceedance value of 22 mg/l.
Measurements of DO concentrations in the Narrows tailwater also demonstrate that there is no
DO sag that occurs downstream of the Narrows powerhouse. At Narrows, except for water that
is spilled through the gates, the water discharged downstream passes through the Narrows
powerhouse. When the reservoir is full and river flows exceed the hydraulic capacity of the four
generating units, excess flows are "spilled" through the gates in the spillway bypass channel.
The spillway channel rejoins the mainstem of the river approximately 2000 feet downstream of
the powerhouse. Thus, even under conditions of spill, water in the tailrace upstream of the
spillway bypass channel reflects the quality of water being "discharged" through the
powerhouse. There are no intervening tributaries, and, other than minimal leakage, generally no
other water makes its way directly into the tailwater near the powerhouse.
As part of the water quality studies done in support of the FERC relicensing process,
independent consultants, working under plans approved by DWQ, conducted a number of
different assessments of Narrows tailwater DO conditions. In addition to monthly grab sampling
done from 1999-2003, temperature and DO were continuously monitored during the late spring
through fall below Narrows and Falls dams from 2000 through 2004. In support of the
continuous DO monitoring efforts, the mixing characteristics of the tailrace waters below the
Narrows powerhouse were evaluated monthly from August through November, 2001. The
purpose of this effort was to insure that the placement of the continuous DO monitor was
representative of all discharged water. The transect locations are shown in Figure 2.4-8 in the
Normandeau, 2005 Water Quality Monitoring Report. Transect 1 was positioned longitudinally
in the river between the dam and the powerhouse discharge. Transect 2 was located laterally
along the bridge adjacent to the powerhouse, and is the location of the continuous DO monitor.
As shown in Table 1, the remaining transects were located laterally across the river,
approximately 200 ft., 400 ft., 500 ft. and 750 ft. downstream of the powerhouse. During each
survey DO and temperature profiles were recorded every 15 meters along each transect. Surveys
were conducted on the following dates: 8/16/01; 9/20/01; 10/31/01; and 11/29/01.
HiJNPON
WHIJAMS
John R. Dorney
March 17, 2009
Page 4
Transect
Number Approximate distance
downstream of powerhouse
Transect 2 221 feet
Transect 3 328 feet
Transect 4 517 feet
Transect 5 632 feet
Transect 6 882 feet
Transect 1 Upstream of powerhouse
Dissolved oxygen concentrations along each of these transects generally varied by less than 1
mg/1 on each sampling date with few exceptions. In cases where DO concentrations were found
to vary more than 1 mg/1, the differences observed were between Transect 1 (upstream of the
powerhouse) and the remaining 5 transects. The lowest DO readings recorded on these dates
were along Transect 1, the transect positioned between the base of the dam and the powerhouse
discharge. Otherwise, there was generally no difference between DO concentrations observed in
the lower transects and those observed at Transect 2 (immediately downstream of the
powerhouse discharge). In short, there was no evidence of a DO sag occurring downstream of
the powerhouse during any of these sampling events.
Similar evaluations of DO concentrations were made in the other three Yadkin Project
("Project") tailwaters (High Rock, Tuckertown and Falls). As at Narrows, the mixing
characteristics of the Falls tailrace were evaluated monthly from August through November,
2001. Evaluations of the tailwaters at High Rock and Tuckertown were made in 2003. As with
Narrows, the purpose of these sampling efforts was to insure that the placement of the
continuous dissolved oxygen monitor in each tailrace was representative of all discharged water.
The transect locations evaluated for each of the other tailwater waters are shown in Figures 2.4-
6, 2.4-7, and 2.4-9 in the Normandeau, 2005 water quality report. Results of these tailwater DO
surveys did not indicate any DO sag present in any of the other three tailwaters (Normandeau
2005, Appendix H).
A separate investigation of dissolved oxygen conditions in the four Project tailwater areas was
undertaken to examine the effect that Project operations may have on DO upstream and
downstream of each of the Project dams during the period of summer stratification. This survey
was conducted in August, 2004. Two scenarios were evaluated during the survey. One scenario
involved monitoring after a prolonged (> 6 hour) period of generation at each powerhouse.
Monitoring under the second scenario was after a prolonged (> 6 hour) period with no generation
or spills. During each survey, DO and temperature profiles were measured at the quarter points
in the upstream reservoir along transects spaced at 1/3 mile intervals starting at the buoy line
(just upstream of the dam) and proceeding upstream. Downstream of the dams, DO and
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WHIIAW
John R. Dorney
March 17, 2009
Page 5
temperature were measured along transects spaced at 1/a mile increments downstream of each
dam. Additional transects were added downstream of each dam until observed temperature and
DO conditions at consecutive transects were similar or the river channel became part of the next
downstream impoundment.
In the Narrows tailrace, DO and temperature were measured along 4 transects downstream of the
powerhouse/dam as shown in Figure 3.4-3. Approximate distances of the transects downstream
of the powerhouse are shown in the table below.
Transect
Number Approximate distance
downstream of powerhouse
Transect 1 242 feet
Transect 2 1,529 feet
Transect 3 2,908 feet
Transect 4 4,284 feet
Results of this DO sampling effort for all four reservoirs and tailwaters are provided in Tables
3.4-4 through 3.4-7 of Normandeau's 2005 Water Quality Monitoring Report. In the Narrows
tailwater, during the period of generation (8/20/04), average DO concentrations across each
transect ranged between a high of 5.1 mg/l at Transect 2 to 4.7 mg/l at Transect 4. During the
period of non-generation measured on 8/21/04, average DO concentrations across each transect
ranged from 6.9 mg/1 at Transect 1 to 6.6 mg/1 at Transect 4. In both cases, the difference in the
average DO concentration measured across each transect was less than 0.5 mg/l. Although there
was a modest (and perhaps not statistically significant) decline in DO after the waters left the
Narrows powerhouse, there was no evidence of a DO "sag" in the Narrows tailwaters during
either sampling event.
Nor was there any evidence of a DO sag in the other three Project tailwaters. In fact, all of the
tailwater areas appeared generally well-mixed with relatively uniform DO concentrations during
both the generating and non-generating periods.
In the future, DO sampling will be conducted to confirm the improvement in tailwater DO
concentrations that result from the planned installation of DO enhancement technologies in
accordance with the schedule outlined in the RSA. At Narrows and Falls, future DO sampling
will include both continuous monitoring of DO and temperature conditions at the existing
continuous monitoring stations located in each tailwater, as well as a special 2-year study to
investigate the total effect on downstream DO concentrations associated with the installation and
operation of DO enhancement technology at all four Narrows units. Under the proposed
schedule, the special 2-year study of Narrows and Falls DO would begin in 2011, and would
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John R. Dorney
March 17, 2009
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include evaluations of the fate of DO as water travels down the Narrows tailrace and through the
Falls impoundment. Results of this study would be expected to reaffirm the absence of a DO sag
in the Narrows tailwater, or even further downstream at Falls.
Similar DO sampling is planned for the High Rock and Tuckertown developments. At these two
developments, future DO sampling will also include both continuous monitoring of DO and
temperature conditions at the existing continuous monitoring locations located in each tailwater,
as well as a special 2-year study to investigate the total effect on downstream DO concentrations
associated with the installation and operation of DO enhancement technology at all three of the
High Rock units. Under the proposed schedule, the special 2-year study of High Rock and
Tuckertown would begin in 2013, and would include evaluations of the fate of DO as it travels
down the High Rock tailwater and through Tuckertown Reservoir. Results of this study would
be expected to reaffirm the absence of a DO sag in the High Rock and Tuckertown tailwaters.
AIR #5 - Please provide data and a map showing all known locations of PCBs at the Alcoa site
and in the nearby cove of Badin Lake.
Summary: The requested data and maps are provided in Appendix A. The data summarized in
Appendix A were collected as part of two different study efforts: 1) Sampling of Narrows
Reservoir (locally known as "Kadin Lake") sediments conducted by APGI in December, 2008
(URS 2009); 1 and 2) An ongoing and comprehensive Resource Conservation and Recovery Act
("RCRA") Facility Investigation ("RFI") of waste sites conducted by Alcoa at its Badin Works
smelter (MFG 2001) with oversight by the N.C. Department of Environmental and Natural
Resources' Division of Waste Management ("DWM").
Detailed Response: The recent sampling of Narrows Reservoir sediments was done by
independent consultants in December, 2008, and was conducted in accordance with a sediment
monitoring plan that was submitted by APGI on June 20, 2008 and amended based on comments
from DWQ on July 31, 2008. Sediment samples were collected along 10 transects, as shown in
Figure 1. PCB results for each transect are summarized in Table 1.
The remainder of the information provided in Appendix A is historical information and data that
were collected as part of an investigation that has been ongoing since the late 1980s and is being
conducted by Alcoa in coordination with state and federal officials to identify and investigate
waste sites on its property in Stanly County and to take appropriate action to remediate sites that
' On February 16, 2009, APGI filed with DWQ the final study report for the December 2008
sediment investigation prepared by URS entitled 2008 Sediment Data Report Badin Lake.
HUNTON
W I AW
John R. Dorney
March 17, 2009
Page 7
might pose a human health or environmental risk. This work has been and continues to be
performed under the close supervision of DWM in accordance with RCRA, a federal program
adopted by the State of North Carolina to regulate the management of waste. APGI does not
consider this information as relevant to the current 401 proceeding.
Through the RCRA process, 47 potential waste sites associated with the Badin Works smelter in
Stanly County were identified and investigated. The RFI (MFG 2001) filed with DWM reported
on the collection of hundreds of samples (including water, groundwater, soil, and reservoir
sediment samples), which were analyzed for hundreds of potential contaminants over the past
two decades. For purposes of responding to this AIR, Alcoa has compiled the PCB results
collected both prior to and as a part of the RFI process. These results include PCB
concentrations measured at some sites both before and after remediation. Therefore, most of the
PCB data included herein are historical and are not indicative of current conditions.
Figure 2 is a map showing the locations of sediment samples collected historically from the cove
of Narrows Reservoir. These samples were taken in 1996 and 1997 as part of the ongoing RFI
and in 2007 by Environmental Services Inc. on behalf of Stanly County (ESI, 2008). The PCB
results for the historical sediment sampling conducted at these locations are summarized in Table
2.
Figures 3 through 6 are maps showing the locations of waste sites located on Alcoa property in
Stanly County that have been investigated historically as part of the RFI, and where PCBs have
been detected. Table 3 summarizes the PCB results for groundwater samples, and Tables 4 and 5
summarize the PCB results for soil samples taken at these sites. Data in Table 5 represent both
qualitative field screening data used for remediation purposes as well as laboratory samples used
for QA/QC purposes to validate the field screening method.
AIR #8 Please address the following questions related to the discharge sampling from Badin
lake.
Summary: Taken as a whole, the three parts of this additional information request outlined
below suggest that DWQ is trying to address concerns expressed by commenters about whether
water chemically altered by virtue of its interaction with sediments on the bottom of the reservoir
is being discharged through the Narrows dam. These concerns are unfounded. As shown by the
information provided in our responses below, in reality, very little (if any) water adjacent to
sediments gets drawn into the intakes and is discharged. This reality is a function of the physical
characteristics of the dam, intakes and reservoir, as well as the physical properties of water. As
explained in considerable detail below, based on the information in the existing record there are
three essential points.
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John R. Dorney
March 17, 2009
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1) During periods when Narrow Reservoir is thermally stratified, the upper and lower water
layers in Narrows reservoir do not mix with one another to any meaningful extent.
Narrows Reservoir thermally stratifies in the summer (June through October) into an
upper (epilimminon) and a lower (metalimnion) layer of water. Between the warm upper
layer and cold bottom layer is a middle layer (metalimnion) through which there is a
strong temperature gradient (thermocline). Because of this thermal stratification, and
because cold water is denser than warm water, there is no meaningful mixing between
layers.
2) Due to the depth of the reservoir (175 ft), during stratification, the water within the
bottom layer does not circulate from bottom to top because there are no physical forces
(e.g., thermal or other currents) that would drive it to do so.
3) During periods of stratification, the water drawn through the powerhouse has not been in
contact with or influenced by the bottom sediments. This is because (a) the Narrows
powerhouse intakes draw water from the upper and middle layers of the reservoir; (b) the
intakes are located 100 feet above the reservoir bottom; and (c) there is a strong
temperature difference between the middle and bottom layers.
Detailed Response to DWO's Specific Ouestions:
a. What was the depth of the water withdrawal from the lake when the sample was taken?
The intakes at Narrows Dam are located at a depth of 31.2 ft. (9.5 m) to 66.3 ft. (20.2 m)
(Normandeau 2005, p. 109) from full pool. On August 13, 2008, the date on which the
discharge sampling from Narrows was conducted, Narrows Reservoir was approximately
6.1 ft. (2 m) below full pool. The intake depths on that date would have been 24.6 ft. (7.5
m) to 59.7 ft. (18.2 m) below the surface of the reservoir. The total depth of the reservoir
in front of dam is approximately 175 ft. (53 m). This places the bottom of the intakes
approximately 109 ft. above the reservoir bottom.
b. What is the approximate zone of influence from the withdrawal? In other words when the
sample was taken, what is your estimate of the area from which the water was being
withdrawn?
Figure 1 clearly illustrates the vertical area within the water column from which water
was being withdrawn through the Narrows powerhouse intakes during the August 13,
2008 discharge sampling event. As shown, on August 13, 2008, Narrows Reservoir was
strongly thermally stratified, and the powerhouse intakes were withdrawing water from
HUNTON
WRIJAMS
John R. Dorney
March 17, 2009
Page 9
the metalimnion (the middle layer through which there was a steep temperature gradient).
Thus, while low DO water was being pulled from the reservoir during the August 13,
2008 discharge sampling, the waters being discharged were not being drawn from the
hypolimnion, as has been suggested by certain commenters.
The stratification observed in Narrows Reservoir on August 13, 2008 was similar in
nature to that observed during longitudinal and lateral surveys of dissolved oxygen and
temperature conducted during August 20-21, 2004 (Figure 2).2 During the 2004 survey
which looked at DO and temperature conditions upstream and downstream of Narrows
Dam, the intakes were above the thermocline but extended through a large zone of low
oxygen water in the lower epilimnion. Those survey results indicated that during
generation the turbines entrained water from the depth interval of the turbine intakes as
well as some water with higher oxygen content from above the turbine intakes. Strong
thermal gradients below the depth of the intakes restricted movement of appreciable
amounts of water from the deep hypolimnion.
Many years of reservoir monitoring data (Normandeau 2005) demonstrate that similar
stratification conditions persist in Narrows Reservoir throughout the summer each year,
typically June through October (Figures 3 and 4). As a result, it is likely that very little
hypolimnetic water is ever discharged from the Narrows powerhouse when Narrows
Reservoir is stratified. Moreover, any hypolimnetic water that is drawn through the
Narrows powerhouse would represent only a small fraction of the discharge, and would
be drawn from the upper portion of the hypolimnion, approximately 100 ft. above the
sediments. The intakes are further isolated from the sediments by a thermal gradient of
approximately 5°C which would serve to limit mixing of waters between the elevation of
the intakes and the lower hypolimnion. Thus, even if anoxic conditions near the bottom
of the reservoir at the sediment interface were causing the re-mobilization of certain
metals or contaminants, those would not be drawn through the intakes.
z Intake elevations on the plots shown in Figures 1 and 2 indicate the depth of the intake below
the surface of the reservoir on the date that the profile was taken. On August 13, 2008 Narrows Reservoir
was approximately 6.1 feet (about 2 meters) below the normal full pool elevation.
HUNTON
VXL"S
John R. Dorney
March 17, 2009
Page 10
Figure 1. Narrows Reservoir temperature and dissolved oxygen profile immediately
upstream of Narrows Dam during generation, August 13, 2008 (Source: ENSR, 2000
a
10
20
Depth (mj 30
40
50
60
r
I
r l Intakes
L 7.5 - 18.2 m
I
I
r
I
I
I
I
I
I
I
I
l
Temperature i"C
-- Dissrivel0,;yyen nry1L.3
0 5 10 15 2n 25 30
Temperature CC)
0 2 4 C.
8 0
Dissolved Oxygen (nng?L)
HUNTON
WRLIAMS
Join R. Dorney
March 17, 2009
Page 1 1
Figure 2. Narrows Reservoir temperature and dissolved oxygen profile immediately
upstream of Narrows Dam during generation, August 20, 2004 (Source: Normandeau
2005, Ficure 3.4-5)
0
10
20
1 30
o ,.
40
50
Temparswrc (°C)
D 1 2 3 4 5 6 7 8 9 10
DO (mgA)
6 5 10 15 20 25 30
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WHIIAMS
John R. Dorney
March 17, 2009
Page 12
Figure 3. Temperature profiles immediately upstream of Narrows Darn froYn 1999 to 2003
(Source: Normandeau 2005, Figure 2.3-3)
1i
1=
s?
E 1.
C
7
41 1 ?
W
if
11
11
1C
iC
Water Temperature (degC) at Station N4
Z J H Z J F Z Q J ?- Z J b- Z J F Z
a Q D 'y 2 o Q ¢ ' C a Q O q a O
Month
HUNTON
VML"S
John R. Dorney
March 17, 2009
Page 13
Figure 4. Dissolved oxygen profiles immediately upstream of Narrows Dam from 1999 to 2003
(Normandeau 2005, Figure 2.3-3)
160
155
150
145
140
135
0
130
125
!L
120
115
11 0
105
100
Dissolved Oxygen (mg/L) at Station N4
l ',i.,•? :. ?i it 1. ?1 III ,?I\ If ?
i11 ( ????' Ai ?f i I l
II. i! I i I J11 1?
? M N q O - .- N N , ? o ,
z C< ? W O O O b p q q O O O O O O O O
Z H Z E J F Z (Y J F Z M Z CC J Z
00 !? r,L 00 4 07 00 <, a<-
Month
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John R. Dorney
March 17, 2009
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c. What is the depth ofsediment that has accumulated at the darn and tt,hat are its
characteristics with respect to approximate particle sizes?
According to USDA (1979, as cited in Normandeau and PB Power 2005) Narrows
Reservoir accumulates 131 acre-feet of sediment per year which results in an annual loss
in reservoir capacity of 0.05%. The Narrows Reservoir sediment accumulation rate is
much lower than that experienced in High Rock Reservoir upstream. Most of the
sediment movement occurs duein-
high flow events. Using data collected from 1999
through 2003, Normandeau (2005) presents a longitudinal profile of suspended solids at
20 stations through the 4 impoundments of the Yadkin APGI system. These results
clearly indicate that suspended solids concentrations are reduced in each successive
impotmdment downstream. Suspended solids concentrations at Narrows Dam are 90%
lower than concentrations observed at the upper end of High Rock Reservoir. In general,
the sediments transported through the Yadkin Project reservoirs are representative of the
fine-grained Piedmont soils that encompass much of the watershed. Of those sediments
originating upstream of High Rock Reservoir, the heavier particles are likely deposited in
High Rock Reservoir. Although specific sediment investigations have not been conducted
in Narrows Reservoir in the vicinity of the Narrows Dam, based on this information, fine-
grained silts and clays are expected to be the predominant sediment type near the dam.;
Using a comparison of a pre-Project topography map from 1913 (Narrows Reservoir was
filled and started operations in 1917) and a 1988 topographical map which included
bathymetry soundings, sediment depths were estimated along a transect (near transect T-
10 that was sampled by APGI in December, 2008) which is located approximately 600 ft.
upstream of the dam. At this location it is estimated that the sediment depths between the
three middle sampling locations along this transect average about 15 feet with a
maximum depth of about 35 feet (see Figure 5). At the two sampling locations along this
' From 1913 to 1927, Narrows was the first dam on the upper portion of the Yadkin River, and
thus probably experienced fairly heavy sedimentation. Beginning in 1927, however, High Rock
Reservoir became the uppermost reservoir on the river of any significance, and in 1962 Tuckertown was
constructed between Narrrows and High Rock. Thus, the sedimentation that has occurred since 1962, and
particularly since 1927, has been of a different characteristic than sedimentation prior to that time. That
would suggest that the upper sedimentation at Narrows is of finer silts and clays than the pre-High Rock
sedimentation since the presence of High Rock and Tuckertown would be expected to take out the heavier
particles of sediment.
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VMLMS
John R. Dorney
March 17, 2009
Page 15
transect closest to the reservoir shorelines, a comparison of the data is inconclusive.
However, based on the slope of the topography, it can be reasonably assumed that little, if
any, buildup of sediment has occurred on the side slopes of the river valley.
Regarding sediment composition near the dam, during the December, 2008 sediment
sampling conducted by APGI, sediment characteristics were noted as the samples were
collected. The sediment descriptions for the sample locations along Transect 10 (close to
Narrows daze) are shown in the table below. As would be expected, sediment in this part
of Narrows Reservoir appears to be composed primarily of very fine materials including
silty sand, silty clay and organic matter.
Transect 10 Location Data. (Source: URS 2009)
Transect 10
Sample Location Depth Sediment Coord inates (N/E)
(ft) Description Northing Fasting
A 75 Silty Sand 609778.061 1673571.700
Silty Sand with
B 130 Organic Surface 609880.169 1673784.957
Layer
C Silty Clay with
(Discrete Sample) 169 Organic Surface 609983.760 1674011.552
Layer
Silty Clay with
D l46 Organic Surface 610032.383 1674202.091
Layer
Silty Clay with
E 75 Organic Surface 610103.941 1674337.373
Layer
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S
John R. Dorney
March 17, 2009
Page 16
Figure _5. Comparison of 1913 and 1988 Bottom Contour of Narrow Reservoir near Narrows
Dam. {Source: PB Power 2009)
550
_ 500
i=
i?
?n
c 450
a, Y
w a
co
400
350
0 100 200 300 400 500 600 700 800 900 1,000 1,100 1,200 1,300
Distance from Left Bank (ft)
-1988 1913
Narrows Reservoir
Cross Section of 1913 & 1958 River Contours
U1S of Narrows Dam (Near Transect T-10)
(Looking Downstream)
HvrrroN
WHILaMs
John R. Dorney
March 17, 2009
Page 17
Please feel free to contact me with any questions or comments.
Sincerely Yours,
A 11?-' ?
Craig A. Bromby
CABlpsb
Enclosures
cc: Gene Ellis
Coralyn Benhart
David R. Poe
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WHILAMS
John R. Dorney
March 1.7. 2009
Page 18
Citations
ENSR Corporation. 2008. Yadkin Project Sampling of Priority Pollutants in the Narrows
Tailrace. September 26, 2008.
MFG, Inc. 2001. RCRA Facility Investigation Report, Volume I of Il. Alcoa Badin Works,
Badin, NC. March, 2001.
Normandeau Associates, 2005. Yadkin Water Quality Final Study Report. August, 2005.
Appendix E-1 of the Yadkin Project Application for License.
URS Corporation. 2009. 2008 Sediment Data Report Badin Lake. February, 2009.
APPENDIX A
Information Request in AIR #5
Figure 1. Location of transects along which sediment samples were collected in December, 2008
{Source: URS 2009}

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Figure 2 Legend -.
PCB Concentration for
s, s???Ta?rs,,mr?_
2008 Sediment Samples n
-JC Y:-F.id=':' -•fi"; Trcf:9Pil Lo catir.i
API„nr 8o,ntl? rv
I
11 : JF.>

J-.. ....-?

2
Table 1. Summary of PCB results for sediment samples collected in December, 2008 (Source:
URS 2009 )
Table 2. DOS Sediment Data Summan-??)1 Badin Labs?'
Trvnseet t Transerl2 Transco 3 Transtri 4 Transeci 5
Par>mreter Cam ile Discrete com ate Discrete Com ilt Dia-rete lane ,site Divett Com site Discrete
11-SED-0 TI-SFD-1C T?-SED-r Tl-SED-1C TISED-0 T3-SFD-1C T4-SEDa) T4 SFD 111 TS SED-0 T3-SED-IF
PCBs (mzkg:i
PCB-1016(Araclorl6161 =).0594 =0.1)6 -00994 -6.111 <0.11_' =0.116 <C .t01 x(14 032_' J119
CP-12311Aroclor1 221t = 0*94 `0.166 -00994 -6.111 ?rI1Z <0.116 '0.F-I C. 14 ?OJZ2 ).119
CB-1D3 (Arodor1132) =00.0594 0.1(16 6.0991 0.111 =C LL' 0.116 =0.1=i1 =0.10 =0,3_'_ 01,119
PCB-IM IAroclor124Zi 6.0594 0. 106 -0.0994 0.111 rC, III "11.116 X0.161 =0_N -0321 0,119
PCB-l'49AroclarINEI =0.0*94 -0.166 0994 =0.111 <O,lll ?6.I16 ?6.lul =G.ld =0.3?? -0.119
CB-12N (Aroclor1354) =00594 C,106 0,0994 0.111 =0.112 <ALL6 -0.101 0.14 -0.311 -0.119
PCB-L60(Aroclor1260) =0.05ol <C.IOn 70.7994 G.lll =011' 16 1.1a -014 -0323 ;6.119
Transtel 6 1ransert7 . Transtet 8 Transerl9 TraElsect 10

Paranreter
Compaate Compo?tt

iDeplicatel l
Discrete
Composite
Disrtte
Composte
Dicrete
CmnP061C
vkrele
Compo,itt
Discrete
B-SED-0 T6-SED-0-D17P' T6-SCD.22 I7 SED-0 7-SED-IC TS-SED-0 n4D-18 T9-SED-0 Tg,! D•IC I10-SED-0 710-SED-1C.
PCBs [mg kg
PCB-1016 iAroclcr 10161 =0364 -0,9804 0.138 -1314 17 -0.1:8 -,0.13 -0.136 00983 -m8 `0.119
PCB-1211 idraelarI2 11 -,1364 =DAN ;1 IN -6.340 0.13 <6.t5S =0.I3 -0.138 -0,0983 =01'8 A.119
PCB-1Z32l.droctor1233i '0.364 -0.081 -1138 -0344 -0.12 -0.158 =1.13 -0.138 =00983 -C.1 i$ <0.119
PCB-IL42(Arcelo112431 '0.361 'USA '0.135 <U344 -0.12 <0.158 =6.13 -0.138 =10983 `0.158 0.I19
CP.1_74SiAroelor1248) e0.354 0.0804 6138 10,344 G.12 -1 .158 =0.13 =0.138 =3.0983 O.1S8 0.114
Kfl-1Z54lAwlar12541 1361 =0.0801 =0, 13E -0.314 10.1_ 0.1{8 0.13 -0.138 0.0983 =0.158 7.119
PCB-1260 (Aroclar1260) =0.364 <C .08C -0 ,138 '0:341 <O.i2 0.158 ;0,13 '6.138 C.09 S3 =0.15E ! ,O.Il9
Figure 2. Location of sediment samples collected in 1996, 1997 and 2007 as part of the RFl waste site
investigation conducted by Alcoa (Sources: MFG 2001, ESI 2007)
4
Table 2. Summary of PCB results for sediment samples collected in 1996, 1997 and 2007 as part
of the RFI waste site investigation conducted by Alcoa (Sources: MFG 2001, ESI2007).
Table 1. Summary of Historical PC 13 Data - Badin Ernbavment
Sample ID Date Aroclor 1242
(mg/ka) Aroclor 12=18
(mg/kg) Aroclor 1254
(mg/kg) Aroclor 1260
(mg/kg) Total PCBs
(mg/l g)
NEP1 Jan-97 N1) (r0.001) ND ( OM04) 0.005 0.006 0.010
NEP2
- Jan-97 ND ( A).002) 0.072 0.020 0,012 0.054
INTEP3
NF-.P4 Jan-97
Fa 1196 ND ( "0.001)
N'-A ND (?-0.004)
ND { < 2.60) N'D (-0.003)
N A ND ( :0.004)
\D(,,2.60) ND
ND
N1?;P5 .1an-97 NJ) (- 0.002) 0.093 ND ( ="0.t)04) 0.157 0.250
NFP6 Jan-97 ND ( =OA02) 0.251 0.151 0.153 0.585
NEP9 Jan-97 ND (,:0.002) 0.053 0.0713 0.073 0.204
NEP10
_ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ....
NEPII Jan-97

Jan-97 ND (=0.002~)

NJ) J.),001) 0.213

0.051 0.211

0.018 0.327

0.012 0.751

0.081
SA-1A Dec-07 ND (:0.084) ND (;:0.084) N71) ('0.084) NJ) (- 0.084)
SA-113 Dec-07 NJ) 0.087) ND(-:0.087) ND(A.087) (MM 0.086
ti:a-1C Dec-07 ND { = 0.OS4) ND (- 0.084) ND (=-0.084) NJ) ( .0.084)
SA-2A

SA-213 Dcc-07
..........
Doc-07 ND (:,0.09,)
..............................................................
N) (,:0.090) ND (•"0.09=)

ND 1. 'O.09t)) ND (; 0.09;)

ND (-0.090) ND (-0.093)

ND (=0.090)

ND
SA-2C Dec-07 ND (,,"0.095) ND ( "0.095) ND (-0.095) ND (0.095)
SA-3A Dec-07 0.057 ND (-0.088) ND (,-0.088) ND (=0.058)
S:1-313 Dec.-07 N1) (-0.083) ND ( 0.083) ND (-0.083) ND ( 0.083) O.OS7
SA-3C Dec-07 ND (°0.091) NI) 0.091) hD 0:0.091) ND (-(1 091)
\EP12 Jan-97 ND f`=0.0113) 0.097 0.257 0.044

NEP12 (dup)
Jan-97
ND f.' 0.000
0.175
0.545
0.114 0,616
\EP13 .Tan-97 NI) 00.002) 0.166 0,.9=4 0.062 0.622
NEP16 Sep-96 N. A ND ( 2.20) \-A 4.30

`EP t6 (d tip)

Sep-96

N'A

ND ( :2.90)

NA
- -
6.50 5
.40
NEP1'7 Jan-97 N7) (: 0.003) 1.07 1.50 0.419 2.99
-NE1'21 Jan-97 ND (A.00.3) 0.202 0.2611 0.094 0.557
SA-4A Dec-07 ND 00. 180) ND (=0.180) 11.720 ND (_0.150)
SA-413 Dec-07 ND ("0.150) ND ( 0.180) 0.8-40 ND (:.0.180) 0.813
SA-4C Dec-07 ND 0.190) NJ) { :0.190) 0.880 NT) (=0.190)
!NEP22 .tan-97 ND 0.002) 0.127 0.117 0.050 0.294
-NEP23 Jan-97 ND (<.0.(101) 0 3 '_3 0.204 0.064 0.591
-NFP24 Jan-97 3.35 ND (=0.002) 0.750 0.220 4.32
BR-1.N Dec-07 2.40 M) (:0.180) ND 0. 180) 0.520
I3R-113 Dec-07 2.20 IND('"0.1901 ND( 190) 0.300 2.47
BRAC Dcc-07 1.St) ND 0.190) ND ( -0.190) 0.-480
5
Table 2 continued.
Table 1. Summarv of Historical PCB Data - Baclin Embavrtient
Sample ID Date Aroclor 1242 Aroclor 1248 :lroclor 1241 Aroclor 1260 "Total PCBs
(mg/k€;) (m-,/k°) (mg/kg) (tng/kg) (mg/ kg)
BR-2A Dcc-07 \D (:0.100) ND( 0,100) ND (A).100) ND 0.100)
BR-213 Dec-07 ND (-:0.110) NTD ("0.110) N7) 0. 110) ND ( -0.110)
BR2C Dec-07 ND 0.110) T\D ( ,,,0.110> 0.150 ND (< 0.111))

BR 21(dup)
Dec-07
til) (-0.110)
ND( 0.110)
0.200
0.120 0.177
BR-213 (d up) Dec-07 ND( 0.110) M) F0.110) 0.170 ND ("0.110)
BR-2C (du ) Dcc-07 ND (°:0.100) ND ('-0.101)) 0-210 ND (--0.100)
R-1 i Dec-07 NB ('0.077) ND (< 0.077) ND ( --:0.077) ND 0.077)
R-1B Dec-D
7
ti7) ( 0.120;
Ni) (-.0.120}
ND( 0_]20)

ND f 0.120)
R-tC Dec-07 ND ( 0. 120) M.) ( 0.120) IUD (
O. 120) N?D (<0.120) -

R-1A (dup)
Dec-07
ND ( :0.095)
AD (- 0.098) __
IUD 1 0.093)
ND (0.093) N1
)
R-1B (du p) Dc?,:-07 XD (--0.110) N1) -0.110) ND ( ?d).I10) ND (=-0.110)
R-U'(du) Dec-07 V"D(-0.110) ND( 0.110) 1 ND .110) ND 0. 110)
Dana Snnrces
Sep-96= Wcod%t and Clyde Con>u Mani
Fall-4f = Wood, 41d CIV11C CO I] vIUnIS
Jan-97 ? Woodward 0%de Cuusu[ranl
Dc,-C" SUnlyCouWx
-Cots] R'B, presented as sum of deleetcd Aroulors. Pup Iicate samPILs nr samples wah IIIUIGpIC replicatzs, W(Te aeera;ed. I
one duplicare was reporter) as not detected. while the other WHS reported m detected- then the hid est single :lroclar-specific
reporting limit cons used to represent the nonderect ror a eracing purposes.
Figures 3-6. Location of sites investigated as part of the Alcoa RFI.
Figure 3
.? - Yi'T4T `r' - r .
V ? h • `
? ?,+ '/' ? ? Via.
t - -' CS-1 - ND
1l r
CS-2 - ND
' 4
i
Ak'
SSI ND
r T
ss-2 - ND
• rj .P 8-016-1 - ND w-
_' 5-016-2 - NDy
B-016-3 - ND k
.s°
i ! SWMU#39 1
ND acv .
S38-TB01 2.0-2-5R 11
ND
77
r . r ?P I r' I .$
Legend
Soil
Water:
® Field Screened 4ew ;:.
SVVMU 38? j {
UST stockpile
Building 016 `
SWM U 39 l,'
units = mgll #-
w,
units = mg/kg
`.` 0 200 400 Feet.
8
Figure 4

Figure 5
W--10
-0.5 mg?kcg ~V A
111 '? S22-TB01-1.5-2.0
NO
x ,
?- f t ED
E-8 dup
ND
J
W -4-N
(7'
+ S22-TB03-0 5-1.0
6.8 mg/kg ND
f,
f W
4
E
1
S22-TB02-3 5-4.0 -0 -
-
r ?
ND
?w A Y-01
1 1.99 n,gikg

X-03
6.7 mg/kg
X-04

2.3 mg/kg
-
00
v ..
` X-02
_
E-1 -W d ¢
.? 0 d 830 mglkg
1300 mg/kg 1 :
r
f E-1
3.64 mg/kg _..
j
( 1

I E 1 N ~ ..?
1.2 mgdkg fig

L
e9end -,
V?
yr?
O Soil f
ff
Water f `
1
7lJi h ': J?
A Field Screened
SWMU 22

units = mg/kg ?.
0 60 120 Feett
A
N
A
10
Figure 6
MW6-2638
ND
MW-6-2639D '
ND
MW6-2639EB
ND
S35-TB10-0002
64.1 mg/kg j/
S35-TB10-0406 i
18.8 mgikg f t
S35-TB10 f Fr
Field Screening Result
0.0-2.0 FT - =2
2.0-4.0 FT = >2
4.0-6.0 FT - >2
6.0-8.0 FT = =2 4
S35-TB07-0002
0.052 mgikg --
535-TB07 /r t
i
Field Screening Result
0.0-2.0FT=-2
2,0-4.0 FT - 12 /
4 0-6.0 FT = [2 s
6.0-8.0 FT = c2
S35-TB01-0.0-0.5 S35-TB11-0002
110 mgikg - ND
S35-TB01-0406 S35-TB11-0002D
D_065 mg/kg ND
S35-TB 11
Feld Screening Result 1
0.0-2.0 FT= -2 J
2.0-4.OFT= t2
' 4.0-6.D FT= <2
6080FT=<2
!(l fF
Legend
0 Soil
r!
fit

S35-TS04-002
f 0.12 mgikg
I S35-TB04
Field Screening Result
f +
!! 1 0.0-20 FT = <2
F
2040FT=<2

MW-27-2779
- Y' ND
N
S35-TB06-0002
26.3 mgikg
I .' S35-TB03-0.0-0.5R S-35-TB06
ND Field Screening Resull
I t• 00-20FT=>2
2.0-4A FT - <2
4.0-5.0 FT= <2
6.0-8.0 FT = =2
i ]c
d ",IT- .: . _. S35-TB12
Field Screening Result"@
Field Screening Result
0.0-2.0 FT= <2 I
2.0-4.0 FT= ?2
4.0-6.0 FT= ?2
•• tit 6.0-8.0 FT = a2 I
S35-TB02-0 0-0 5 sss'`w.
2.8 mgikg 'v . _.
S35-TB02-0406 S35-TB09
9 mgikg Field Screening Result
S35-TB02-1418R 0.0-2.0 FT w 2
2.0-4.0 FT = <2
0.086 mylkg
4.0-6,D FT = <2
'. `.. 6.0-8.0 FT = <2
S35-TB08
Field Screening Result
0.0-2.0 FT = >2 t 4'.
2.0-4.0 FT = -2
s
4 l'
l
Water %
Field Screened
V`
SWMU 35
units = mg/kg ?,>t
s i'units = mg/l -
.fie
11 0 50 100 Feet
Table 3. Summary of PCB results for ground water sites sampled as part of the RFT waste site investigation conducted by Alcoa (Source; MFG 2001).
Alcoa - Badin Plant
PCB G round Water Sampli ng Summary
X Y SamplelD SampleLocatian Sample Date Aroclor Aroclor Arodor1232 Aroda1Z42 'odor Aroclor Aroclor Total PCB's Units ReportAuthor
Report Name
Source in Report
_ 101.4 1221 1248 1254 1280
1667078 406787 MW-6-2639 MWb 9/20%1999 <0.001 <O.ODl --0.001 <0.001 <0.001 --0.001 --0.001 ND mgl MFGEliv dronmemalScienti sts&Engineers 2001 Mar -RCRAFacilltylnvestigationReport Table 429
1667078 506787 MW-6-2619D MW6 9/20/1999 <0,001 <0,001 <9.001 <0.001 <0.001 --0.001 <0.001 ND mg/I MFG Ermironmental5cienLists&Engineers 2001 Mai -RCRAFacHiitylnvestigationReport Table 429
1667078 606787 MW-5-2639EB MW6 9/20/1999 <0.001 <0.001 <0,001 <0.001 <0.001 <0001 <0.001 ND mg/I MFG ErtyironnienlalScientists &Elbineers 2001 Mar - RCRAFacilitylnvestigaGonReport AppericlixA-1,LdbAnalylicrl
1667331.286 60683&3907 Mft,V27-2779 MW 27 10/4/1999 <0.001 <R001 -,0,001 <0.001 <0.001 --0.001 <0.001 ND mg/I MFG67tlironmenlalScientists&Eivineers 2001 Mar RC RA Fa dlitylnvestigation Report Table 429
1665002356 603052-071 ABL-MW3d669 ABL-5WMU2 912311999 <0.001 <0.001 <0,001 <0.001 <0.001 <0.001 <0.001 ND mg/I MFGEnvironmental 5dentists&Engineers 2DO1M1.tar-RC RA FablitylnvestigationReport Table465
16673b6,899 505550.752 B016-1 Building 016 6/16/1992 <0.0002 <0.0002 <0.0002 <0.0002 <0.0002 <0.0002 <OM002 ND mg/I Aquaterra,Inc. 1992Jul-Soil &6roundwalerussessnertReporl 01b Table 3
1667366.899 605550.752 BOlb-2 Suildiib016 6/16/1992 <0.0002 <0.0002 <0.0002 <0.0002 <9.0002 <0.0002 <0.0002 ND mg/I Aquaterra,Inc. 1992Ju1-Soil &6roundwalerAssessment Report-Bullding015 Table 3
1667366.899 605550.752 B016-7 Buildiiy016 6/16/1992 <O.0002 <0.0002 <0.0002 <0.0002 <0.0002 <0.0002 <0.0002 ND mg/[ Aquatena,Inc. 19921ul-5oil&GronndwalerAssessment Report -Bullding015 Table3
1667366.899 605550.752 MW-1 Buildirt, 016 6/16,/1992 --0.0002 <0.0002 <0.0002 <0.0002 <0.0002 <0.0002 <0.0002 ND mail Aquaterra,Inc. 1992Jul-Soil &GroundwateiAssessnentReport -DiOlding016 Table3
1665433.467 604195.1004 PA4V-NIL 6 ABL-5WMU2 9/16/1992 <0.001 <O.001 <0.001 <0.001, <0.001 <0.001 <0.001 ND mg/I Aquaterra,Inc. 1992 Nov - GronndwaterAsse ssnentRepoFtloiABLand08L Lab Analytical
1665212.SY 604,147,2622 MWML-1 ABL-5WMU2 9/16/1992 <0.001 .0.001 <0.001 <&001 <0.001 <0.001 <0.001 ND mg/l Aquateira,Inc. 1992 Nov - Groundwater Assessment Report for ABL and OBL Lai) Analytical
1664817.441 604044.5777 MW-ML-2 ABL SWMU2 9/16/1992 <0_o01 <0.001 <0.001 <0,001 <0.001 <D.= <0.001 ND mg/l Aquaterra,Inc. 1992 Nov- Groundwater Assessment Report for ABL and 08L Lab Analytical
1664413.836 603645.3525 MW-ML-3 ABL-5WMU2 9/16/1992 <0.001 --0.001 <0.001 <0.001 <0,001 <C.091 <0,001 ND mg/l Aquaterra,Inc. 1992 Nov- Groundwater Assessment Report for ABL andOBL Lab Analytical
1664638.946 6D3335.7657 MvV NTL-4 ABL-SVdMU2 9/16/1992 <0.001 <0.001 <0.001 <0.001 <0,001 <0.001 <0,001 ND mgil Aquaterra,Inc. 1992 Nov- Groundwater Assessment Report for ABL and DBL Lab Analytical
1665002.756 6D3052.071 MW-PL-5 AB L-SVO.Itt2 9/16/1992 X0.001 <0.001 <0.001 <0.001 <Q001 <0.001 <0.001 ND mall Actuate II a, Inc. 1992 Nov-GioundwaterAsses9 entReport [DiABLand OBI_ Lab Analytical
1665002.756 603052.071 MW-ML7(MVVJOW-5 Duplicate) ABL-5WMU2 9/16/1992 <0,001 <0.001 <0.001 --0.001 <0.001 <0.001 <0.001 ND mg/I Aquateua,Inc. 1992 Nov - GroundwaterAssessmentReportlotABLandOBL LabAnalyfical
- - MW-ML-S (QA/QC Sample) ABL-SWMU2 9/16/1992 <0.001 <0.001 <0001 <0.001 <0.001 <0.001 <0.001 ND mill Aqualelra,Inc. 1992 Nov- GroundwaterAssesmtentReport forABLand OBL Lab Analytical
1665433.467 604195.1004 MW-ML-6 ABL-SWMU2 121811992 --0.001 <0,001 <0.001 --0.001 <0.001 <0.001 <0-001 ND nlgil Aqualerra,Inc. 1993 Mar -Deeember1992Grotandww(,r5amplin;Event Lal) Analvtical
1665433.467 604195.1004 MW-ML 7(MW-MW-5 Duplicate) ABL-5WMU2 12/8/1992 <0.001 <0.001 40.001 e).001 <o_001 <0.001 <0.001 ND mg/I Aqualetra,Inc. 1993 Mar- December 1992Gramchvater5ampl'utgEvent LabAnalytlcal
- - PA'N-M1-8(QA/0(Sample) ABL-5WMU2 12/8/1992 <0.001 <0.001 <0.001 --0.001 <0.001 <0.001 <0.001 ND mg/I Aquaterra,Inc. 1993Mar-December 1992 GroundwaterSaril)HMEvent LabAnaalytical
NOTE, UV-u,-,r J
NA-Hot analy+.cd
ND Not rlNerted
<G7]1- NOL drtnl e d at a label holy qu3rccati on liihiL of ..P; I m?7Fg
Table 4. Summary of PCB results for soil samples taken as part of the RF1 waste site investigation conducted by Alcoa (Source: MFG 2001).
,
_-. _..... ._...__........ __. .., .. PC5 Soil Sampling Summary
Sample lC Sam*LOCItiOn Sample oat ,ruder 1016 ]Aador 1721:A-lu Ll., Aloolo, 1242 Arodor 1248: AI lu 1254 A-1Cr 1260 undo, 1262 4a1u 1268 TaMPLE, U,.ts Saluple deylll l€1- Rpm Author
Itcpurln ame
S.-,, in Ruport
5i2:! . ..__SW1,1U:2 +iCllu p0.° 1
L 39 W.Oy <C.039 :CO?° IP_J33 10,035 NA - e,`A N€ i.52 'T3-p71F YxEn.L.1ttr<Ir¢, 2,101 h"er -RrN t'rle:'.SdfiCn R¢Cfrlt T.hleC :S
1
r1eT 5J0 SNR,lUY C.... O.C-0 4 - :C C9 <0 0] OAd 11A NA ?0
F/a E
I
p

1.1 RR A Iy R p 1
ro F i
hl
T
5

12-T.L 12. 1.0

l"r1,4U 2e

yC/1??9

.011

C 2

--=0.o12 ? GG

,

:

0.0.17,

A

IA

[

N
-?.
L.. 1.0
i E U F Y .,
U,,.?e - , 1c
ECT
. .. .. .. .1?1 69_r F' S Pn RePnt

it
a, rveiR
dt
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"S
01 "21U 2! .,lE,-'L1x.1' W, NA NA L': , W00 NA 'VA !L J7'g! f„C-C.$ L]l'; i,'r _'r-C ':[rlce<, -n.. [95i 7uri-Wtf. ,salary-:r-,I yi ROI:J:S Tab c:i
;,1ti NILki Y-If ,VJIJIU7 !1?'/LS`'3 f!A ! NA O.clS <0 Ca 0C5 Mb NA " NA kC - f?'r'kH E I:.C-I:.S LsvrE
_ °93 tun-' 1. n.t,rv ??npfri P.Pr, Tah:eF

-IN I.ILC cd
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5°i:un -CAf1 mdte fy °'r"In Rep)'I
6
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le+t c"mo
,
j-
-1 :7s6s
,'153
WLTi
JI
<N.;K
05
'0 C5

G'I

,p.c5

G5

........

C

.

.
4:..r

r[r.:rr-j: G Erv Ya mer,tal5>:v1,PS.1r<.

.7, -Ve'it t:-ICtc Repot P„q, nears.

_rt'r Ea, rl-..
M1. NA NA NA C:L-. <ol .1[03 NA -...-AT .crl.lrr'.. .... .:eP U: rtpr _rL rr rrrFln .-iea?l .. ..... ...... ..
-_n -Iralle,7I5 751E/1`.6'1: N0. N4 NA N0. GCs.: - cL]Cif c0.C033 NA iiA "IC ?7,j UN Apa.:er'a.-t. ..2 r: -U' aa[tp lF ai .d:m ROpnn Taael

2
Table 5. Field Screening.
Alcoa - Badin Plant
PCB Field Screening Sampling Summary
x
1667301.123
1667301.123
1667208.107
1667208.107
1667208.107
1667208.107
1667159.452
1667159.452
1667159.452
1667159.452
1667199.049
1667199,049
1667199.049
1667199.049
1667187.279
1667187.279
1667187.279
1667187.279
1667187.279
1667228.551
1667228.551
1667228.551
1667228.551
1667190,875
1667190.875
1667217,72
1667217.72
1667217.72
1667217.72
1667222.334
Y
606826.99
606826.99
606752.974
606752.974
606752.974
606752.914
606736.528
606736.528
606736.528
606736,528
606737.607
606737.607
606737.607
606737.607
606657.525
606657.525
606657525
606657.525
606657.525
606726.526
606726.526
606726.526
606726,526
606693.607
606693.607
606726.804
606726.804
606726.804
606726.804
606750.964
NOTE: ND -Notde:ected
NA Not analyzed
Sample ID
S35-TB04-0002
S35-TB04
S35-TB06-0002
S35-TBO6
S35-TB06
S35-TS06
S35-TB07-0002
S35-TB07
S35-TB07
S35-TS07
S35-TB10-0002
S35-TB10-0406
535-TB10
S35-TBlO
S35-TB11-0002
S35-TB11-0002D
S35-TB11
S35-TBll
S35-TBll
S35-TB05
535-TBOS
S35-TB05
S35-TB05
S35-TBO8
S35-TBO8
S35-TBO9
S35-TB09
S35-TB09
S35-TB09
535-TB12
Sample Location Sample Date Field Screening
Result
SWMU 35
SWMU 35
SWMU 35
SWMU 35
SWMU 35
SWMU 35
SWMU 35
SWMU 35
SWMU 35
SWMU 35
SWMU 35
SWMU 35
SWMU 35
SWMU 35
SWMU 35
SWMU 35
SWMU 35
SWMU 35
SWMU 35
SWMU 35
SWMU 35
SWMU 35
SWMU 35
SWMU 35
SWMU 35
SWMU 35
SWMU 35
SWMU 35
SWMU 35
SWMU 35
8/26/2000
8/26/2000
8/26/2000
8/26/2000
8/26/2000
8/26/2000
8/26/2000
8/26/2000
8/26/2000
8/26/2000
8/27/2000
8/27/2000
8/27/2000
8/27/2000
8/27/2000
8/27/2000
8/27/2000
8/27/2000
8/27/2000
8/26/2000
8/26/2000
8/26/2000
8/26/2000
8/27/2000
8/27/2000
8/27/2000
8/27/2000
8/27/2000
8/27/2000
8/27/2000
<2
<2
>2
<2
<2
<2
<2
<2
<2
<2
>2
>2
>2
>2
>2
NA
<2
<2
<2
<2
<2
<2
<2
>2
>2
>2
<2
<2
<2
<2
<b yield deTeCted ata concentration less than the screening standard of 2 rlgfkg
>2 - Feld detected at a concentration greaser than the screening standard of 2 mg,tkg
Confirmatory Lab
Sampling Results
(Total PCB)
0,12
NA
26.3
NA
NA
NA
0.052
NA
NA
NA
64.1
18.8
NA
NA
ND
ND
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
Units
mg/kg
mg/kg
mg/kg
rng/kg
rng/kg
rng/kg
mg/kg
mg/kg
mg/kg
mg/kg
mg/kg
mg/kg
rng/kg
mg/kg
mg/kg
mg/kg
mg/kg
mg/kg
mg/kg
mg/kg
mg/kg
mg/kg
mg/kg
mg/kg
mg/kg
mg/kg
mg/kg
mg/kg
mg/kg
mg/kg
Sample depth (ft
bgs)
0.0-2.0
2.0-4,0
0.0-2.0
2.0-4.0
4.0-6.0
6.0-8.0
0.0-2.0
2.0-4.0
4,0-6.0
6.0-8.0
0.0-2.0
4.0-6.0
2.0-4.0
6.0-8.0
0.0-2.0
0.0-2.0
2.0-4.0
4.0-6.0
6.0-8.0
0.0-2.0
2.0-4.0
4.0-6.0
6.0-8.0
0.0-2.0
2.0-4.0
OA-2.0
2.0-4..0
4.0-6.0
6.0-8.0
0.0-2.0
Report Author
MFG Environmental Scientists & Engineers
MFG Environmental Scientists & Engineers
MFG Environmental Scientists & Engineers
MFG Environmental Scientists & Engineers
MFG Environmental Scientists & Engineers
MFG Environmental Scientists & Engineers
MFG Environmental Scientists & Engineers
MFG Environmental Scientists & Engineers
MFG Environmental Scientists & Engineers
MFG Environmental Scientists & Engineers
MFG Environmental Scientists & Engineers
MFG Environmental Scientists & Engineers
MFG Environmental Scientists & Engineers
MFG Environmental Scientists & Engineers
MFG Environmental Scientists & Engineers
MFG Environmental Scientists & Engineers
MFG Environmental Scientists & Engineers
MFG Environmental Scientists & Engineers
MFG Environmental Scientists & Engineers
MFG Environmental Scientists & Engineers
MFG Environmental Scientists & Engineers
MFG Environmental Scientists & Engineers
MFG Environmental Scientists & Engineers
MFG Environmental Scientists & Engineers
MFG Environmental Scientists & Engineers
MFG Environmental Scientists & Engineers
MFG Environmental Scientists & Engineers
MFG Environmental Scientists & Engineers
MFG Environmental Scientists & Engineers
MFG Environmental Scientists & Engineers
Report Name
2001 Mar- RCRA Facility Investigation Report
2001 Mar- RCRA Facility Investigation Report
2001 Mar- RCRA Facility Investigation Report
2001 Mar- RCRA Facility Investigation Report
2001 Mar- RCRA Facility Investigation Report
2001 Mar • RCRA Facility Investigation Report
2001 Mar- RCRA Facility Investigation Report
2001 Mar - RCRA Facility Investigation Report
2001 Mar - RCRA Facility Investigation Report
2001 Mar - RCRA Facility Investigation Report
2001 Mar - RCRA Facility Investigation Report
2001 Mar - RCRA Facility Investigation Report
2001 Mar- RCRA Facility Investigation Report
2001 Mar- RCRA Facility Investigation Report
2001 Mar- RCRA Facility Investigation Report
2001 Mar- RCRA Facility Investigation Report
2001 Mar- RCRA Facility Investigation Report
2001 Mar- RCRA Facility Investigation Report
2001 Mar- RCRA Facility Investigation Report
2001 Mar - RCRA Facility Investigation Report
2001 Mar - RCRA Facility Investigation Report
2001 Mar - RCRA Facility Investigation Report
2001 Mar - RCRA Facility Investigation Report
2001 Mar - RCRA Facility Investigation Report
2001 Mar - RCRA Facility Investigation Report
2001 Mar - RCRA Facility Investigation Report
2001 Mar - RCRA Facility Investigation Report
2001 Mar - RCRA Facility Investigation Report
2001 Mar- RCRA Facility Investigation Report
2001 Mar - RCRA Facility Investigation Report
Report Source
Table 4-19 & 4-18
Table 4-18
Table 4-19 & 4-18
Table 4.18
Table 4-18
Table 4-18
Table 4-19 & 4-18
Table 4-18
Table 4-18
Table 4-18
Table 4-19 & 4-18
Table 4-19 & 4-18
Table 4-18
Table 4-18
Table 4-19 & 4-18
Table 4-19 & 4-18
Tahle 4-18
Table 4-18
Tahle 4-18
Table 4-18
Table 4-18
Table 4-18
Table 4-18
Table 4-18
Table 4-18
Table 4-18
Table 4-18
Table 4-18
Table 4-18
Table 4-18
3
65215,000006 EMF US 26986517v2