4101_Guilford_CityHighPoint_Riverdale_MSWLF_Seaboad_ExtractionCommentLetterResponse_FID1776478_20230306

SEABOARD GROUP II AND THE CITY OF HIGH POINT
March 6, 2023
Eric B. Aufderhaar, P.G., Environmental Program Consultant
North Carolina Department of Environmental Quality
Division of Waste Management
1646 Mail Service Center
Raleigh, North Carolina 27699-1646
Re: Extraction System Evaluation Monitoring — TM-11
Revised Analytical Data Table 2
Former Seaboard Chemical and Riverdale Drive Landfill Site
Jamestown, Guilford County, North Carolina
Dear Mr. Aufderhaar:
In response to correspondence from your office dated February 20, 2023, please find attached a revised
Table 2 - Groundwater VOC and 1,4-Dioxane Analytical Results as requested.
Thank you for your review of this information. If there are any questions or comments regarding this
submittal please contact us. Please direct correspondence related to this matter to:
Mr. Craig Coslett
de maximis, inc.
1550 Pond Road, Suite 120
Allentown, PA 18104
Communications via electronic mail should be directed to [e-mail] and
[e-mail].
Respectfully,
Seaboard Group II and City of High Point
Gary D. Babb, P.G.
Babb & Associates, P.A.
cc:
Jackie Drummond - NCDEQ Division of Solid Waste
Craig Coslett — Project Oversight Coordinator

TABLE 2
EXTRACTION SYSTEM EVALUATION - GROUNDWATER VOC AND 1,4-DIOXANE ANALYTICAL RESULTS
SEABOARD CHEMICAL/RIVERDALE DRIVE LANDFILL SITE
Page 1 of 3
vo IC COMPOUNDS AND 1,4-DIOXANE ug
Sample I.D.
Sample
Date
O
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CD
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a
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CD
7
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0
s
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m
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7
M
S
o
o
M
I
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S
o
O
m
S
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2
N
q
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3
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m
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7
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n
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fD
x
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7
m
Q
Ct
-
O
S
CD
<
O
0
y
NC 2L St
200
IL 0.6
6
350
0.4
0.6
6000
1
0.3
50
3,000
70
3
701
600
5
0.7
100JL
3
0.03
IL500
AW-2
Historical 44
3/25/2021
66
<1
<1
1.4
<1
<1
<1
60
21
0.84J <1
24
13
4.4
<1
1.1
<1
<1
<1
0.57J
<1
<1
<1
<3
ND
Historical
4/7/2021
28
<1
<1
0.98J
<1
<1
<1
52
<20
<1
<1
16
8.7
<1
<1
1.1
<1
<1
<1
<1
<1
<1
1.5
<3
ND
Background
3/22/2022
185
<1
<1
2.2
<1
<1
<1
410
<20
2.6
<1
86
86
<1
<1
3.2
<1
<1
<1
0.94J
0.61J
<1
5.5
<3
4.0
6/30/2022
Extration Wells Online
1st Quarter
9/27/2022
309
<1
<1
1.9
<1
<1
<1
282
<10
<1
<1
6.4
300
<1
<1
0.77J
<1
<1
<1
<1
<1
<1
<1
<1
3.1J
2nd Quarter
1/5/2023
40
<1
<1
1
<1
<1
<1
130
<1
<1
<1
1.5
36
<1
<1
0.62 J
<1
<1
<1
<1
<1
<1
<1
<1
1.1
3rd Quarter
4th Quarter
AW-3
Historical
3/25/2021
1,192
<1
<1
130
<1
<1
<1
480
<20
14
<1
800
110
8.8
<1
53
<1
<1
<1
<1
<1
<1
76
<3
ND
Historical
4/7/2021
1,402
<1
<1
150
6.5
<1
<1
520
<20
<1
1,000
100
<1
<1
55
<1
<1
<1
<1
<1
<1
90
<3
ND
Background
3/22/2022
1,754
<20
<20
250
20
<20
<20
810
<400
<20
<20
1,100
65
<20
<20
130
<20
<20
<20
<20
<20
<20
170
<60
19
6/30/2022
Extraction Wells Online
1st Quarter
9/27/2022
879
<5
<5
97
6
<5
<5
739
<50
6.3
<5
630
39 +
<5
<5
47
<5
<5
<5
<5
<5
<5
54
<5
7.5 J
2nd Quarter
1/5/2023
1,660
<20
<20
180
15 J
<20
<20
480
<20
9.8 J
<20
1,200
21
<20
<20
96
<20
<20
<20
<20
<20
<20
130
<20
8.5 J
3rd Quarter
4th Quarter
AW-4
Historical
3/25/2021
3,578
260
2.2
860
290
71
<1
550
<20
13
<1
<1
62
<1
<1
1,200
5
0.85J
5
18
<1
<1
760
19
11.5
Historical
4/7/2021
3,763
170
<1
560
190
47
<1
390
<20
13
<1
1,400
94
<1
<1
690
7.7
<1
<1
17
10
<1
530
20
14
Background
3/22/2022
3,330
200
<20
500
200
60
<20
490
<400
<20
<20
1,000
30
<20
<20
780
<20
<20
<20
12J
<20
<20
540
8.4J
ND
6/30/2022
Extraction Wells Online
1st Quarter
9/27/2022
1,432
<10
<10
31
<10
<10
<10
378
<100
11
<10
700
300
<10
<10
3.3J
<10
<10
<10
4.4J
<10
<10
<10
4.2J
ND
2nd Quarter
1/5/2023
743
<10
<10
46
<10
<10
<10
210
<10
9.11
<10
550
76
<10
<10
25
<10
<10
<10
<10
<10
<10
37
<10
<10
3rd Quarter
4th Quarter
AW B-4
Historical
3/25/2021
4,860
<1
<1
860
<1
220
<1
1,200
<20
<1
<1
3,200
<1
<1
<1
180
<1
<1
<1
<1
<1
<1
400
<3
ND
Historical
4/7/2021
3,730
<1
<1
720
<1
160
<1
1,100
<20
<1
<1
2,300
110
<1
<1
130
<1
<1
<1
<1
<1
<1
310
<3
ND
Background
3/22/2022
4,119
<50
<50
550
21J
120
<50
1,200
<1000
<50
<50
3,000
48
<50
<50
150
<50
<50
<50
<50
<50
<50
230
<150
ND
6/30/2022
Extraction Wells Online
1st Quarter
9/27/2022
3,632
<25
<25
490
111
170
<25
1,230
<250
35
<25
2,700
<25
<25
<25
86
<25
<25
<25
<25
<25
<25
140
<25
ND
2nd Quarter
1/5/2023
4,271
<50
<50
450
<50
130
<50
920
<50
33 J
<50
3,300
78
<50
<50
90
<50
<50
<50
<50
<50
<50
190
<50
<50
3rd Quarter
4th Quarter
" Total VOCs does not include 1,4-Dixone concentration

Sample I.D. Sample
Date
NC 2L Standa
OW-SIS1
Historical
3/25/2021
Historical
4/7/2021
Background
3/22/2022
6/30/2022
1 st Quarter
9/27/2022
2nd Quarter
1/5/2023
3rd Quarter
4th Quarter
RW-SIS1
Historical 7/23/2020
Historical 3/23/2021
Historical 4/8/2021
Background 3/22/2022
6/30/2022
1 st Quarter 9/27/2022
2nd Quarter 1/5/2023
3rd Quarter
4th Quarter
MW-7A
Background
3/22/2022
6/30/2022
1st Quarter
DRY
2nd Quarter
DRY
3rd Quarter
4th Quarter
MW-7B
Historical
3/3/2009
Background
3/22/2022
6/30/2022
1st Quarter
9/27/2022
2nd Quarter
1/5/2023
3rd Quarter
4th Quarter
TABLE 2
EXTRACTION SYSTEM EVALUATION - GROUNDWATER VOC AND 1,4-DIOXANE ANALYTICAL RESULTS
SEABOARD CHEMICAL/RIVERDALE DRIVE LANDFILL SITE
Page 2 of 3
m
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O
0
m
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7
m
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m
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7
CD
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0
m
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O
0
m
S
(D
7
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O
0
m
S
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M
01
7
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v
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D
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7
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7
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7
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S
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7
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M
O
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O
3
m
S
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7
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NfD
S
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m
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7
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m
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N
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7
M
n
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N
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O
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m
S
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7
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M
7
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SO
O
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S
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7
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n
O
a
(D
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7
m
-
M
01
-
Q
S
<
O
n
(n
NE
200
14
0.6
6
350
320
0.4
0.6 3 6000
1
0.3
50
3,000
70
1 3
70
600
0.6J
5
6.4
0.7
9.8
600
16
lou11111111111M
<1
3
14
0.03
<1
500
4,347
1.6
2,100
120
<1
1,600
<20
19
<1
<1
190
<1
<1
1,500
24
12.0
9,429
<1
<1
2,300
330
140
<1
1,200
<20
<1
<1
2,900
200
<1
<1
1,500
<1
<1
<1
36
<1
23
2,000
<3
ND
5,197
<100
<100
1,100
230
97
<100
960
<2000
<100
<100
1,700
<100
<100
<100
1,100
<100
<100
<100
<100
<100
<100
970
<300
ND
Extraction Wells Online
<100
21,346
32J
<50
2,700
290
100
<50
4,870
<500
58
<50
8,100
690
<50
<50
1,400
<50
<50
<50
26J
<50
18J
2,500
18J
544
16,658
<200
<200
2,100
300
<200
<200
4,000
<200
<200
<200
9,500
470
<200
<200
1,500
<200
88 J
<200
<200
<200
<200
2,700
<200
<200
11,461
170
<50
1,700
260
64
<50
3,200
<500
40
<50
5,800
300
<50
<50
1,100
<50
<50
<50
27
<50
<50
2,000
<150
ND
7,428
120
<1
1,000
160
<1
<1
2,500
<20
27
<1
3,800
190
0.49J
<1
830
1.5
6.2
4
16
4.7
7.4
1,200
17
43.3
7,800
140
<50
1,200
180
62
<50
2,800
<1000
<50
<50
3,700
190
<50
<50
1,000
<50
<50
<50
<50
<50
<50
1,300
<150
28.0
10,344
340
<100
1,300
330
74 J
<100
2,800
<2000
<100
<100
4,900
200
<100
<100
1,600
<100
<100
<100
<100
<100
<100
1,600
<300
ND
Extraction Wells Online
Not sampled for VOCs due to sampling error
714
562
<10
<10
12
<10
<10
<10
500
<10
<10
<10
430
100
<10
<10
11
<10
<10
<10
<10
<10
<10
8.5 J
<10
<10
428,900
10,000
<500
38,000
17,000
7,000
<500
35,000
72,000
<500
<500
41,000
3,700
<500
<500
57,000
900
53,000
2,300
13,000
<500
<500
44,000
4,900
65,100
Extraction Wells Online
215,424
2,630
<100
25,800
10,100
9,760
<100
28,900
12,000
<100
<100
39,500
2,450
<100
<100
36,100
181
48,100
522
6,020
<100
251
15,800
1,740
4,470
202,680
3,000
<500
19,000
6,800
5,900
<500
45,000
5,600
<500
<500
40,000
6,200
<500
<500
24,000
380
52,000
1,500
8,500
<500
<500
22,000
2,400
5,400
Extraction Wells Online
308,024
5,500
<200
32,000
12,000
7,300
<200
48,900
17,000
430
<200
35,000
19,000
<200
<200
32,000
300
51,000
6,400
12,000
<200
1,200
34,000
2,300
40,594
235,680
3,500
<500
22,000
8,000
4,200
<500
41,000
7100 J
410 J
<500
47,000
13,000
<500
<500
24,000
460 J
41,000
4,000
12,000
<500
810
33,000
2,900
12,300
Total VOCs does not include 1,4-Dixone concentration

TABLE 2
EXTRACTION SYSTEM EVALUATION - GROUNDWATER VOC AND 1,4-DIOXANE ANALYTICAL RESULTS
SEABOARD CHEMICAL/RIVERDALE DRIVE LANDFILL SITE
Page 3 of 3
Sample I.D.
Sample
Date
O
m
<
O
0
(n
Z5'
2:
O
0
m
S
D7
7
fD
fJ
Z5'
2:
O
0
m
S
of
7
CD
_
b
F
R:
O
0
m
S
0)
7
(D
_
O
0
m
S
(D
7
(D
IV
O
0
m
S
0)
7
(D
O
�
2:
a
0
0
M
01
7
(D
A
v
a
K
0l
7
(D
D
(1
O
7
(D
N
(D
7
(D
0
O
-1
0
0
O
CL
(D
0
2:
o
p
a
N
(D
7
(D
0
0
m
S
of
7
(D
S
0
0
M
O
I
n
2:
o
3
m
S
a)
7
M
N
N
F
_
0
m
S
(D
7
(D
m
3
`G
is
N
(D
7
M
.r
m
CDO
n
S
O
a
(D
0
s
O
0
m
S
(D
7
(D
-
C
M
7
(D
01
N
S
o
N
s
(D
0
s
O
0
S
CD
7
(D
n
O
a
(D
x
7
m
-
M
W
-
S
<
O
0
(n
NC 2L Standa
OW-SF1
NE
200
2,920
0.6
48.4
6 ME
350
5,530
0.4
0.6
3 6000
1
0.3 50
3,000
70
3
<10.0
70
20,400
600
15.7
5
0.7
600
100
3
1,290
0.03
7,240
500
185
Historical
3/9/2009
50,770
4,980
1,860
<10.0
6,670
242
90
<10.0
2,160
1,840
194
F 680
437
618
40.2
ND
Background
3/22/2022
78,400
6,000
<500
6,200
8,700
940
<500
2,700
<10000
<500
<500
2,800
720
<500
<500
42,000
<500
<500
780
660
<500
2,800
6,800
<1500
ND
6/30/2022
Extraction Wells Online
1st Quarter
9/27/2022
351,646
39,000
<200
32,000
20,000
4,600
<200
11,300
15,000
270
<200
38,000
3,300
66J
<200
79,000
380
11,000
11,000
13,000
<200
1,600
29,000
1,800
52,630
2nd Quarter
1/5/2023
10,025
350
<50
810
940
49 J
<50
4,200
<50
<50
<50
570
410
<50
<50
3,600
<50
99
<50
97
<50
<50
3,100
<50
<50
3rd Quarter
4th Quarter
PW-3D
Historical
2/7/1997
43,150
4,100
ND
370 J
790
15,000
ND
ND
ND
260 J
ND
16,000
ND
ND
ND
ND
ND
1,300
990
740
ND
3,600
ND
ND
160
Historical
7/17/1998
21,579
ND
650
ND
520 J
8,100
ND
ND
ND
160
ND
8,600
3 J
2 J
ND
ND
13
680
610
ND
ND
2,000
54
49
21
Historical
4/9/2010
10,224
<1.0
<1.0
393
82.5
8,840
<1.0
40
18.4
5.46
<1.0
174
<1.0
<1.0
<1.0
36.1
<1.0
99
137
7.7
<1.0
419
11.6
ND
ND
Historical
11/27/2012
8,477
54
<50
293
203
4,830
<50
55
<500
<50
<50
2,150
<50
<50
<50
54
<50
<50
222
82
<50
589
<50
<50
ND
Historical 41
12/17/2013
27,676
993
9
491
1,180
12,800
<5
20
<50
137
<5
7,250
<5
<5
<5
59
<5
979
723
338
<5
2,540
58.4
12.3
106.5
Historical
12/11/2014
73,280
1,500
<200
610
2,800
14,000
<200
68
<100
310
240
32,000
<200
<200
<200
100
<200
1,100
8,900
1,300
<200
9,300
150
180
790
Historical
10/29/2015
67,856
2,300
<200
660
2,100
17,000
<200
112
<1000
350
<200
32,000
<200
<200
<200
380
86 J
1,000
3,300
1,400
<200
7,000
120 J
<600
160 J
Historical
11/16/2016
45,520
970
<100
400
870
20,000
<100
120
<2000
190
<100
16,000
<100
<100
<100
110
<100
1,100
1,300
610
<100
3,500
<100
<300
470 J
Historical
10/11/2017
70,750
1,700
<200
730
2,000
20,000
<200
180
<4000
330
<200
31,000
<200
<200
<200
280
<200
1,700
3,700
1,200
<200
7,100
120 J
130
760 J
Historical
11/2/2018
61,130
1,600
<200
660
2,000
17,000
<200
170
<4000
320
<200
27,000
<200
<200
<200
510
<200
1,400
3,100
1,100
<200
6,100
130 J
100 J
11101
Historical
9/11/2019
31,150
860
<200
480
1,100
14,000
<200
140
<200
190 J
<200
11,000
<200
<200
<200
350
<200
1,300
620
470
<200
<200
<200
<600
780 J
Historical
10/14/2020
75,870
1,700
<200
800
2,900
20,000
<200
160
<4000
450
<200
32,000
<200
<200
<200
540
<200
1,800
4,800
1,300
<200
8,400
190
210
780
Historical
10/27/2021
46,580
890
<500
660
1,500
17,000
<500
160
<10000
280
<500
18,000
<500
<500
<500
380
<500
1,800
1,200
670
<500
4,200
<500
<1500
ND
Background
3/22/2022
58,450
800
<500
520
1,500
17,000
<500
150
<10000
<500
26,000
<500
<500
<500
420 J
<500
1,900
3,200
910
<500
6,200
<500
<1500
ND
6/30/2022
Extraction Wells Online
1st Quarter
9/27/2022
63,770
920
<200
760
2,100
19,000
<200
128
<2000
360
<200
26,000
<200
<200
<200
540
40J
1,900
3,900
1,100
<200
6,000
120J
1001
930
2nd Quarter
1/5/2023
55,080
760
<500
570
1,600
14,000
<500
120
<500
290 J
<500
26,000
<500
<500
<500
650
<500
1,500
3,100
910
<500
5,500
200 J
<500
<500
3rd Quarter
4th Quarter
* Total VOCs does not include 1,4-dioxane values
J = Estimated concentration, result is between MDL and MRL
*+ = LCS and/or LCSD is outside acceptance limits, high biased.
ND = Not Detected
Total VOCs does not include 1,4-Dixone concentration