9202_Wake_EastWake_MSWLF_SamplingRequest_FID1664861_20220419

Smith
5400 Glenwood Avenue, Suite 400
Raleigh, North Carolina 27S87
tel: [phone]
April 19, 2022
Ms. Jaclynne Drummond
North Carolina Department of Environmental Quality
Division of Waste Management
Solid Waste Section
2090 U.S. 70 Highway
Swannanoa, North Carolina 28778
Subject: East Wake Landfill - Rigsbee Property
Facility Permit No. 9202-MSWLF-1981
Modification of Sampling Plan
Dear Ms. Drummond:
CDM Smith Inc. (CDM Smith), on behalf of Wake County (County), is submitting this request for
a reduction in the groundwater monitoring well network and reduced sampling frequency at
the East Wake Landfill - Rigsbee Property (Site). Currently, the approved groundwater
monitoring network consists of one background well (i.e., MW-01), and five downgradient
monitoring wells (i.e., MW-02, -03, -04S, -04D, and -07) that are sampled semi-annually in the
spring and fall. Monitoring well locations are provided on Figure 1. Background details and
recommendations are provided below.
Background
There are two distinct landfill parcels associated with the East Wake Landfill. One of the parcels,
as shown on Figure 1, is owned by Carolyn Properties, LLC and contains approximately 27 acres
of waste. This parcel is referred to as the J.T. Knott property and is currently part of the North
Carolina Department of Environmental Quality's Special Remediation Branch's Pre -Regulatory
Landfill program.
The second parcel is owned by Mr. James Ervin Rigsbee and contains approximately 46 acres of
waste located in two separate areas (Area C and Area D) as shown on Figure 1. The Rigsbee
property borders the J.T. Knott property to the south and west. A large portion of the parcel is
used for cattle pasture and includes an explosive storage company and associated storage and
office trailers, a home with a detached garage and two barns, and a storage area for abandoned
automobiles. All monitoring wells for the Site, except for the background well, are located on
this parcel. This portion of the Site operated under Permit Number 92-02 until the two waste
disposal areas ceased operations in 1983 (Area C) and 1985 (Area D). All work currently
associate with Area C is being conducted under the supervision of the Pre -Regulatory Landfill
Unit after this area of waste was determined to be eligible for the program in the fall of 2012.
Beginning in 2012, the County voluntarily collected groundwater samples semi-annually from
the monitoring wells associated with Area C and Area D. On September 13, 2018, the Solid
0
WATER+ENVIRONMENT+TRANSPORTATION+ ENERGY+ FACILITIES ;

Smith
Ms. Jaclynne Drummond
April 19, 2022
Page 2
Waste Section (SWS) approved the discontinuation of the groundwater monitoring of Area C by
the County, beginning with the fall 2018 sampling event. Monitoring of Area D has been ongoing
since 2012.
Recommendations
Based on a review of the historic groundwater contours at the Site, monitoring wells MW-2 and
MW-7 do not monitor landfill activities associated with Area D. In addition, depth to water in
MW-2 has continued to increase and recent sampling events have encountered conditions of
"dry" to less than 1-foot of water in the well prior to purging with no recharge. Historically, both
MW-2 and MW-7 have had very few detected volatile organic compounds (VOC) and none above
their respective groundwater standards. There have been no non -estimated value detections of
any VOCs in either well since 2015 (Table 1). There have been inconsistent metal detections in
samples collected from MW-2 and MW-7 that have exceeded their respective standards, but
those concentrations have been similar to those in the background well.
Based on a review of the historic groundwater contours, depths, well construction, and water
quality results in existing semi-annual reports, CDM Smith is requesting that existing
monitoring wells MW-2 and MW-7 be removed from the current approved monitoring network
for the Rigsbee property (Area D) and abandoned. In addition, due to the age of the landfill and
the period of time since closure, CDM Smith is requesting that the sample frequency for the
remaining monitoring wells at the Rigsbee property (Area D) be reduced from semi-annually to
annually. Samples were recently collected in March 2022 and CDM Smith is requesting that
moving forward, samples from MW-1, MW-3, and MW-4s/MW-4d be collected during the spring
sampling events only.
If you have any questions or require further explanation, do not hesitate to call me at (919) 325-
3500.
Sincerely,
F
Mathew F. Colone, PG
Project Manager
CDM Smith Inc.
cc: John Roberson, Wake County
Elliott Cornell, Wake County
4;
9202-MSWLP-1981_Area D Monitoring Modification Request_04192022 10

a 1 Yi-.PC V
\
MW-02,
243.14 c
\
O\
MW-03
231.32 ,
N \
o � ,
1 Area D
\
MW-04S
229.34 L'
MW-04D
229.43
i
Notes'
1. Groundwater elevations were measured on
2. Potentiometric contours are derived from p
and adjusted based on the recent ground,
Map Data Source: February 2021 Aerial Photo
I OV /
Carolyn Properties, LLC
t (J.T. Knott Propertyl
\ MW-07
247.56
N I !Cq,
Plty:
Eatranee
Area C U` I LEGEND
,tJ� Groundwater Monitoring Well
Yrwmmwm� ,*Y 243.52 Groundwater Elevation
R' Potentiometric Contour
/ 240 — Contour Interval =10 feet
irch 21, 2022. (dashed where inferred)
s'a in mvestigetions _.._ Property Line
G she
ip County, North Carolina OneMap.

Table 1
Historic Detected Groundwater Constituents - Metals
East Wake Landfill, Area D
MW-01
22-Oct-14
120
0.61
0.0681
0.91
L
108
MW-01
13-May-15
0.51
230
0X
37
14
41
0"1
M
11
1.9
MW-01
17-Nov-15
260
25
81
31
0.4J
23J
68
MW-01
4-0ct-16
0.181
120
0.631
0.0591
71.7J
0.611
2.41
0.76J
0.97J
2.91
14
MW-01
27-Apr-17
230
1.4
18
6.1J
6.41
24J
54
MW-01
3-Oct-17
130
0.611
0.3L
3.61
1.L
5.31
15
MW-01 (dissolved)
3-0ct-17
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
MW-Ol
15-Jan-18
120
0.67BJ
2.1
0.37J
6.5J
MW-01
19-Apr-18
120
0.63J
1.81
1.41
0.621
7.41
MW-01
31-Aug-18
120
0.44J
1.91
3.31
1.01
12
MW-01
4-Oct-18
140
0.481
3.11
5.51
1.51
1.31
0.151
6.01
39
MW-01 (dissolved)
4-Oct-18
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
2 5J
NA
MW-01
26-Feb-19
150
0.661
2.2J
3.9J
1.31
3.5J
12
MW-01 )dissolved)
26-Feb-19
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
MW-01
17-Apr-19
230
1.3
0.231
6.681
19
6.71
9.71
181
74
MW-01 dissolved)
17-Apr-19
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
MW-01
2-Jul-19
0.181
36
100
15
0.371
2.8
110
380B
MW-01 (dissolved)
2-Jul-19
NA
NA
NA
NA
NA
NA
NA
NA
MW-01
5-Sep-19
180
1.1
3.41
1.91
9.3
2.8
1.41
0.171
&8
28B
MW-01 dup)
5-Sep-19
200
1.2
4.OJ
2.91
11
3.7
1.51
0.21J
12
34B
MW-01 (dissolved)
5-Sep-19
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
MW-01(dup, dissolved)
5-Sep-19
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
MW-01
22-Apr-20
120
0.56
5.41
MW-01 (dup)
22-Apr-20
130
0.53
4.6J
MW-01
7-Oct-20
1Do
0.381
1.71
0.421
19
2.6
MW-01
14-May-21
160
3.31
2.41
9.0
2.8
1.31
25
MW-01 (dissolved)
14-May-21
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
MW-01
19-Od-21
140
0.55
1.31
0.581
8.81
MW-02
22-Od-14
30J
0.21
0.591
0.2B1
0.71
OAJ
38
MW-02
13-May-15
100
61
30
13
41
0.61
81
50
1.7
MW-02
17-Nov-15
0.81
120
11
Si
29
13
41
OAJ
25
123
MW-02(dup)
17-Nov-IS
0.91
210
3.0
0.11
20
81
45
23
61
0.91
98
116
MW-02
4-Oct-16
0.361
0.811
100
1.6
1.131
I6
4.9J
22
20
7.51
0.351
I81
150
MW-02
27-Apr-17
0.63J
120
1.5
8.11
4.71
23
14
3.41
0.561
25
140
MW-02
3-Oct-17
871
0.861
0.151
7.51
IS
18
4.01
0.251
181
160
0.751
MW-02 (dissolved)
3-Oct-17
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
0.261
2.31
NA
MW-02
19-Apr-18
100
1.2
8.5J
20
12
3.81
I51
120
MW-02 (dissolved)
19-Apr-18
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
MW-02
4-Oct-18
32J
0.201
2.2J
4.1J
3.81
3.51
42
MW-02 (dissolved)
4-Oct-18
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
MW-02
17-Apr-19
41J
0.501
2.081
2.41
2.91
IAA
47
MW-02 (dup)
17-Apr-19
39J
0.50J
1.48J
1.71
2.01
27
MW-02
17-Sep-19
1.61
120
2.2
0.161
19
6.91
120B
1.8
MW-02 (dissolved)
17-Sep-19
NA
NA
NA
NA
NA
2.41
NA
NA
NA
NA
NA
MW-02
22-Apr-20
29
0.31J
1.4J
1.3
10
MW-02
7-Oct-20
19
0.351
2.8
8.71
MW-02
14-May-21
80
1.7
6.0
12
5
3.21
56
MW-02 (dissolved)
14-May-21
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
MW-02
19-OC-21
DRY
MW-03
22-0 -14
0.61
430
OABJ
0.81
0.81
41
381
MW-03
13-May-15
11
2
0.21
0
172
42J
0.21
7
183
640
MW-03
17-Nov-15
11
2.9
0.51
V.
35
308
54
0.31
M
271
MW-03
4-Oct-16
0.241
0.351
360
0.101
0.551
1.41
0.621
4.01
5.41
MW-03
27-Apr-17
370
1.01
0.26J
2..1.61
MW-03
3-Oct-17
370
2.01
0.49J
3.31
10
MW-03 )dissolved)
3-Oct-17
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
MW-03
19-Apr-18
360
0.401
3.51
MW-03 (dup)
19-Apr-18
390
0.44J
3.51
MW-03
4-Oct-18
390
1.41
0.281
3.91
4.21
MW-03
17-Apr-19
330
1.41
0.38J
3.51
29
MW-03
5-Sep-19
420
2.11
0.781
3.91
6.4B1
MW-03
22-Apr-20
340
3.01
MW-03
7-Oct-20
350D
2.11
MW-03 (dup)
7-Oct-20
360D
2.11
MW-03
14-May-21
390
0.281
3.51
1.51
24
8.0
6.4
4.
14
MW-03
I 19-0ct-21
1
420
1
1
1
2.91
1.6
3.51
I
6.3J
MW-045
22-0ct-14
0.91
730
1S
41
12J
0.11
581
MW-045
13-May-15
0.81
No
0.51
0.2J
21
23
22
4J
14J
31
MW-045
17-Nov-15
11
1,150
0.61
36
140
151
396
1.8
B.OJD
NNIFIIIIIIIIIIIN
14
MW-045
4-Oct-16
0.30J
I,000D
0.69JD
35D
69D
19JD
91D
MW-045
27-Apr-17
150
2.L
1.6J
0.371
4.1J
MW-045
3-0ct-17
900
0.181
24
14
0.47J
16
1.71
9.5J
MW-04S(dissolved)
3-Oct-17
NA
NA
960
NA
NA
NA
29
NA
NA
NA
NA
NA
NA
NA
MW-045
19-Apr-18
0.60J
590
0.151
11
15
0.43J
7.9J
S.
MW-04S(dissolved)
19-Apr-18
NA
NA
NA
NA
NA
NA
10
NA
NA
NA
NA
NA
NA
NA
NA
MW-045
4-Oct-18
410
9.21
23
621
4.2J
MW-045 (dup)
4-Oct-18
400
8.81
23
5.91
4.61
MW-M(dissolved)
4-Oct-18
NA
NA
NA
NA
NA
NA
8.41
NA
NA
NA
NA
NA
NA
NA
NA
MW-04S (dup dissolved)
4-Oct-18
NA
NA
NA
NA
NA
NA
7.91
NA
NA
NA
NA
NA
NA
NA
NA
MVv-m
17-Apr-19
680
0.161
1.68J
16
13
IAJ
101
1.5J
13
MW-04S(dissolved)
17-Apr-19
NA
NA
NA
NA
NA
NA
16
NA
NA
NA
NA
NA
NA
NA
MW-045
5-Sep-19
0.22J
30
9.4
0.32J
19
9.9B1
MW-04S(dissolved)
5-Sep-19
NA
NA
NA
NA
NA
32
NA
NA
NA
NA
NA
NA
NA
NA
MW-045
22-Apr-20
0.34J
1.71
32
29
18
1.5J
5.9J
MW-04S(dissolved)
22-Apr-20
NA
NA
NA
NA
NA
33
NA
NA
NA
NA
NA
NA
NA
NA
MW-045
7-Oct-20
660D
21
7.2
13
It
SAJ
MW-045
14-May-21
1.61
0.311
0.261
32
21
1.8
18
3.51
0.161
16
MW-045
19-Oc[-21
0.161
30
50
2.2
20
13
MW-04S(dissolved)
19-0c[-21
NA
NA
NA
NA
NA
32
NA
NA
NA
NA
NA
NA
NA
NA
�th Page 1 of 2

Table 1
Historic Detected Groundwater Constituents - Metals
East Wake Landfill, Area D
3.
MW-04D
22-0c[-14
0.61
66a
25
61
21J
31
4BJ
MW-04D
13-May-15
0.81
960
2
0.31
19
40
103
25JJ
0.51
61
173
MW-04D
4-0ct-16
0.291
0.76J
880D
0.2.
0.33J
1.91
21
19
2.0J
181
7.7J
29
MW-04D
27-Apr-17
3.51
940
17
17
1.4J
9.71
3.9J
6.9J
28
MW-04D
3-Oct-17
0.791
"0
10
8.71
0.661
13J
2.5J
MW-04D (dissolved)
3-Oct-17
NA
NA
130
NA
NA
NA
11
NA
NA
NA
NA
NA
NA
NA
MW-04D
19-Apr-18
840
0.151
IS
20
14J
4.81
MW-04D(dissolved)
19-Apr-18
NA
NA
770
NA
NA
NA
IS
NA
NA
NA
NA
NA
NA
NA
NA
MW-04D
4-Oct-18
880
8.41
13
131
1.3J
4.2J
MW-04D(dissolved)
4-Oct-18
NA
NA
940
NA
NA
NA
8.01
NA
NA
NA
NA
NA
NA
NA
NA
MW-04D
17-Apr-19
4.21
1,500
0.251
0.20J
1.9BJ
23
18
1.11
191
15
MW-04D(dissolved)
17-Apr-19
NA
NA
790
NA
NA
NA
28
NA
NA
NA
NA
NA
NA
NA
MW-04D
5-Sep-19
860
18
7.8
0.61J
17
12B
MW-04D(dissolved)
5-Sep-19
NA
NA
790
NA
NA
NA
17
NA
NA
NA
NA
NA
NA
NA
NA
MW-04D
22-Apr-20
7]0
26
20
21
1.71
4.OJ
MW-04D(dissolved)
22-Apr-20
NA
NA
770
NA
NA
NA
26
NA
NA
NA
NA
NA
NA
NA
NA
MW-04D
7-Oct-20
610D
5.0
7.7
0.301
7.3
4.2J
MW-04D(dissolved)
7-Oct-20
NA
NA
NA
NA
NA
NA
5.4
NA
NA
NA
NA
NA
NA
NA
NA
MW-04D
14-May-21
0.64J
3.1
,100
0.40
2.51
22
16
2.7
16
3.2J
20
MW-04D
19-Oct-21
1.3J
OD
12
0.54J
12
8.11
MW-04D (dissolved)
19-Oct-21
NA
NA
40
NA
NA
NA
12
NA
NA
NA
NA
NA
NA
NA
NA
MW-07
22-Oct-14
5091
0.4J
0.21
0.91
0.31
15B
MW-07
13-May-15
150
3
0.71
10
6J
14
12
31
0.31
131
29
MW-07
4-Oct-16
150
3.5
0.071J
7.01
3.41
7.31
7.51
1.41
I8J
21
MW-07
27-Apr-17
93J
1.1
2.21
2.31
1.3J
5.41
11
MW-07
3-Oct-17
140
2.2
0.67J
6.51
7.9J
6.31
1.61
0.171
I81
28
1.7J
MW-07 (dissolved)
3-Oct-17
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
1.61
NA
MW-07
'::Apr-Apr-18
96J
1.5
3.5J
2.51
2.81
2.]J
S.OJ
16
MW-07 (dissolved)
19-Apr-18
NA
NA
NA
NA
NA
1.61
NA
NA
NA
NA
NA
NA
NA
MW-07
4-Oct-18
84J
0.781
1.91
1.81
8.41
MW-07(dissolved)
4-Oct-18
NA
NA
NA
NA
NA
NA
1.7J
NA
NA
NA
NA
NA
NA
NA
NA
MW-07
17-Apr-19
86J
1.0
1.4
4.191
1.7J
4.2J
3.]J
6.9J
33
MW-07(dissolved)
17-Apr-19
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
MW-07
17-Sep-19
68
0.84
1.4
2.0J
1.51
2.81
1.1
44B
MW-07 )dissolved)
17-Sep-19
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
MW-07
22-Apr-20
68
0.83
0.53
1.4J
1.7
0.81J
23
MW-07 (dissolved)
22-Apr-20
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
MW-07
7-Oct-20
0.501
67
0.68
2.4
1.31
20
MW-07
14-May-21
100
1.1
9.4
3.11
1.91
5.5
2.6
2.01
3.61
250
MW-07 (dissolved)
14-May-21
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
MW-07(dup)
14-May-21
91
1.1
6.0
2.91
1.1
3.61
1.9
1.12.9J
160
MW-07
19-Oct-21
71
0.75
9.4
1.7J
0.87J
140
MW-07(dissolved)
19-Oct-21
NA
NA
NA
NA
5.7
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
MW-07 (dup)
19-Oct-21
64
0.65
7.6
1.81
0.86J
120
MW-07 (dup, dissolved)
19-Oct-21
NA
NA
NA
NA
8.0
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
Notes:
1. All units are in micrograms per liter (parts per billion).
2.' - Interim Maximum Allowable Concentration (IMAQ
3 " - Revised Upper Tolerance Level (UTL) calculated as partof the East Wake Lined Alternate Source Demonstration approved bythe North Carolina Department of Environmental Quality on August 17, 2020.
4. dup - Duplicate Sample
5.1- Indicates the analytical result is an estimated concentration between the method detection limit and the limit of quantitation.
6. B -The analyte con entration detected in the method blank -greater than the method detection limit.
7. D - Indicates Lhesampl, was analyzed at a dilution greater than 1.
8. Dissolved metals samples were collected to evaluate the influence of turbidity on total metal concentrations.
9. NA - Not Analyzed
Concentration exceeds the North Carolina 2L
- Indicates the result is below the detection limit
Smi
D th Page 2 of 2

Table 1
Historic Detected Groundwater Constituents - Volatile Organic Compounds
East Wake Landfill, Area D
MW-01
22-Oct-14
0.381
MW-01
13-May-15
MW-01
17-Nov-15
0.551
MW-01
4-Oct-16
MW-01
27-Apr-17
MW-01
3-Oct-17
MW-01
19-Apr-18
MW-01
4-Oct-18
MW-01
17-Apr-19
MW-01
5-Sep-19
MW-01 (dup)
5-Sep-19
--
MW-01
22-Apr-20
--
MW-01 (dup)
22-Apr-20
--
MW-01
7-Oct-20
--
MW-01
14-May-21
5.21
--
MW-01
19-Oct-21
--
MW-02
22-Oct-14
0.781
MW-02
13-May-15
MW-02
17-Nov-15
5.3
MW-02 (dup)
17-Nov-15
5.5
MW-02
4-Oct-16
MW-02
27-Apr-17
MW-02
3-Oct-17
MW-02
9-Apr-18
MW-02
4-Oct-18
MW-02
17-Apr-19
MW-02 (dup)
17-Apr-19
MW-02
17-Sep-19
5.51
--
MW-02
22-Apr-20
--
MW-02
7-Oct-20
--
MW-02
14-May-21
--
DRY
MW-02
19-Oct-21
MW-03
22-Oct-14
3.5
0.931
0.811
MW-03
13-May-15
6.81
0.731
1.51
0.271
0.301
MW-03
17-Nov-15
1.2
3.7
1.1
1.4
1.9
0.651
MW-03
4-Oct-16
BW
3.6
0.991
0.401
0.441
MW-03
27-Apr-17
131
0.771
3.6
0.941
MW-03
3-Oct-17
4.91
0.451
3.7
0.871
MW-03
19-Apr-18
7.31
3.3
0.821
MW-03 (dup)
19-Apr-18
6.91
3.5
0.871
MW-03
4-Oct-18
8.01
0.53
4.3
1.1
0.54
23
MW-03
17-Apr-19
3.01
2.7
0.61
22
MW-03
5-Sep-19
5.41
3.4
0.64
19
MW-03
22-Apr-20
7.01
4.1
0.94
15
MW-03
7-Oct-20
0.481
5.1
1.2
14
MW-03 (dup)
7-Oct-20
0.53
4.9
1.2
15
MW-03
14-May-21
7.11
3.5
0.84
14
MW-03
19-Oct-21
4.31
4.3
0.90
15
MW-045
22-Oct-14
1.4
5.5
1.4
0.471
MW-045
13-May-15
1.2
4.2
0.811
0.481
MW-045
4-Oct-16
0.801
7.0
0.451
1.8
0.881
MW-045
27-Apr-17
MW-045
3-Oct-17
2.11
7.2
1.8
0.811
0.801
MW-045
19-Apr-18
5.91
3.7
1.1
MW-045
4-Oct-18
6.01
1.9
0.79
19
MW-045 (dup)
4-Oct-18
4.41
1.7
0.86
21
MW-045
17-Apr-19
0.77
7.5
1.8
0.80
54
MW-045
5-Sep-19
4.21
0.711
4.31
0.51
0.77
58
MW-045
22-Apr-20
0.72
8.9
2.0
0.76
45
MW-045
7-Oct-20
0.401
5.0
1.6
0.471
32
MW-045
14-May-21
11
0.71
7.0
1.5
0.59
42
MW-045
19-Oct-21
4.61
0.53
8.6
1.9
0.67
51
Smith Page 1 of 2

Table 1
Historic Detected Groundwater Constituents - Volatile Organic Compounds
East Wake Landfill, Area D
MW-04D
22-Oct-14 6.0
1.6
0.381
MW-04D
13-May-15 8.91 0.571 4.6
0.811
0.471
MW-04D
4-Oct-16 0.521 6.3
1.6
0.541
MW-04D
27-Apr-17 4.31 0.411 5.3
1.5
0.571
MW-04D
3-Oct-17 0.491 5.5
1.4
0.441
MW-04D
19-Apr-18
MW-04D
4-Oct-18 3.01 1.3
1.3
0.401
31
MW-04D
17-Apr-19 0.59 6.9
1.8
0.70
48
MW-04D
5-Sep-19 4.41 2.0
0.451
34
MW-04D
22-Apr-20 0.461 6.1
1.7
0.62
40
MW-04D
7-Oct-20 1.3
0.62
12
MW-04D
14-May-21 10
3.1
0.80
21
MW-04D
19-Oct-21 6.71 2.8
0.421
20
MW-07
22-Oct-14
0.831
MW-07
13-May-15
5.61
MW-07
4-Oct-16
MW-07
27-Apr-17
MW-07
3-Oct-17
0.411
MW-07
19-Apr-18
MW-07
4-Oct-18
MW-07
17-Apr-19
MW-07
17-Sep-19
5.21
--
MW-07
22-Apr-20
--
MW-07
7-Oct-20
--
MW-07
14-May-21
4.41
--
MW-07 (dup)
14-May-21
4.71
--
MW-07
19-Oct-21
--
MW-07 (dup)
19-Oct-21
--
Notes:
1. All units are in micrograms per liter (parts per billion).
2.1 - Indicates the analytical result is an estimated concentration between the method detection limit and the limit of quantitation.
3. B - The analyte concentration detected in the method blank was greater than the method detection limit.
4. (--) - Not Analyzed. 1,4-Dioxane was removed from the sampling program for all MW-01, -02, and -07 due to two consecutive non -detect events.
Concentration exceeds the North Carolina 2L Groundwater Standard
Indicates the result is below the detection limit
CDM
Smith Page 2 of 2