NC0004308_Monitoring Report_19980112

NPDES DOCIMENT :SCANNING; COVER SHEET
NPDES Permit:
NC0004308
ALCOA — Badin
Works
Document Type:
Permit Issuance
Wasteload Allocation
Authorization to Construct (AtC)
Permit Modification
Complete File - Historical
7
Monitoring Report
Instream Assessment (67b)
Environmental Assessment (EA)
Permit
History
Document Date:
January 12, 1998
Thies document is printed on reusae paper - ignore any
content on the reYerse aside

W°/, 14:
Aluminum Company of America �
G:3
ALCOA
1998 January 12
NC Division of Water Quality
919 North Main Street
Mooresville, North Carolina 28115
Attention: D. Rex Gleason, P.E.
CERTIFIED MAIL
RETURN RECEIPT REQUESTED
Z 430 589 257
RE. Landfill Seep Monitoring at Alcoa-Badin Landfill - 97Q4
Aluminum Company of America, Badin, North Carolina
Gentlemen:
In accordance with a monitoring program previously described in a letter dated 1997 April 01,
Aluminum Company of America (Alcoa) is providing the attached monitoring results from a seep along
the toe of its Alcoa-Badin Landfill site and from the adjacent Little Mountain Creek through 1997
December.
The Alcoa-Badin Landfill is a closed, former landfill site located near Alcoa's Badin Works facility in
Badin, NC. The landfill is listed as a solid waste management unit in Alcoa's hazardous waste permit
and subject to corrective action. The landfill is bounded on the south side by the floodplain of Little
Mountain Creek. Alcoa has completed construction of voluntary remediation activities at the Alcoa-
Badin Landfill, consisting of landfill regrading and installation of a clayey soil cover. Modeling has
shown that these cover improvements should result in a substantial reduction in infiltration of
precipitation into the landfill, potentially eliminating the seeps.
As shown on one of the attached figures, there is a trend of decreasing seep flow rate; however, it is
too early to conclude if this decrease is in response to the cover improvements or a reflection of
fluctuations in precipitation. Therefore, Alcoa proposes to continue its monthly monitoring of the seep
and adjacent Little Mountain Creek for 1998. Results will be submitted to the Division of Water
Quality on a quarterly basis.
If you have any questions or comments regarding this matter or would like to discuss it in greater
detail, please feel free to contact me at [phone]
Sincerely,
Henk J. v n-deer Meyflen, Y.G.
Staff Hydrogeologist
p:\data\wimvord\rcra\remediat'abindfd`seeps monitoring 9712.doc
P.O. Box 576 Badin, North Carolina 28009 USA

•
Alcoa-Badin Landfill Seep and Little Mountain Creek Water Sample Results
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.4.:.-: ea SConnients
09/24/96
<5.0
<5.0
0.20
<5.0
<5.0
0.97
24
14
33
Middle Seep; WCC
01/06/97
<5.0
<5.0
<0.10
<5.0
<5.0
0.30
<5.0
<5.0
19
Middle Seep
02/12/97
< 5.0
<5.0
< 0.10
< 5.0
< 5.0
0.22
< 5.0
< 5.0
13
Middle Seep
03/31/97
< 10.0
< 10.0
< 0.10
< 10.0
< 10.0
0.40
< 10.0
< 10.0
18
Middle Seep
04/24/97
< 10.0
< 10.0
< 0.10
< 10.0
< 10.0
0.30
12
12
15
Middle Seep
05/28/97
< 5.0
<5.0
0.15
< 5.0
< 5.0
0.56
30
24
21
Middle Seep
06/24/97
<5.0
<5.0
0.13
13
< 5.0
2.7
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fir. , �, ,
Middle Seepwas dry
07/21/97
< 5.0
< 5.0
0.13
13
< 5.0
1.1
59
25
29
East Seep; Middle is dry
08/29/97
<5.0
< 5.0
0.13
< 5.0
< 5.0
2.9
< 5.0
< 5.0
28
East Seep; Middle is dry
09/30/97
< 5.0
<5.0
0.13
< 5.0
< 5.0
0.26
26.8
26.8
21
Middle Seep
10/23/97
< 5.0
<5.0
0.11
< 5.0
< 5.0
0.29
983
957
18
Middle Seep
11/17/97
< 5.0
< 5.0
0.11
< 5.0
< 5.0
0.18
27.1
< 5.0
12
Middle Seep
12/15/97
< 5.0
< 5.0
0.10
< 5.0
< 5.0
0.20
24
< 5.0
13
Middle Seep

100
80
60
40
20
rn
CO
cz
Total CN
Note: No seep sample collected in
06/97. East Seep sampled in 07/97 and
08/97 because Middle Deep was dry
rn rn
rn _
C
Ss)
Mo 0 0
-+- Little Mountain Creek - Upstream
10/97 sample showed 983 ug/L
Total CN. Questionable Result
based on historic data.
rn rn
s20.1
0 rn o
cfl o 0 0
-a-Little Mountain Creek - Downstream -A-Landfill Middle Seep

• •
100
80
60
40
20
CN Amenable to Chlorination
. '�;�.,s_,�;��•�a,{:tom#-,;
Note: No seep sample collected in 06/97.
East Seep sampled in 07/97 and 08/97
because Middle Deep was dry
0■ h a
C0
O O OD
d' � CQ
CQ O ..---
O� ` C?
O O O
10/97 sample showed 957 ug/L
CN Amenable to Chlorination.
Questionable Result based on
historic data.
■ ■ ■ ■
L- 1` i- Z's-
4.
O O OD Cr)
d' o� d=
01 0.1 02 01
\ \ \ \
O CZ:, O O
OD
CA
C\1
CO
- • - Little Mountain Creek - Upstream —a—Little Mountain Creek - Downstream —*— amenable CN (ug/L)

• •
100.0
10.0
1.0
Total Fluoride
Note: No seep sample collected in 06/97.
East Seep sampled in 07/97 and 08/97
because Middle Deep was dry.
CSh
CD
C\?
O
z— Z—
CiJ ' O
\ \
i~
-- C\1
—o— Little Mountain Creek -Upstream —E— Little Mountain Creek -Downstream --a—Landfill Middle Seep

•
•
•
25.0
20.0
15.0
10.0
5.0
0.0
ABL Seep History
Cover Improvements
Construction from
05/97 to I0/97
t`
CTh
CNI
CC)
-Total Seep - - - 3 per. Mov. Avg. (Total Seep)