NC0032719_Report_20190731 (2)

Table 4. Summary of Groundwater Sampling Analytical Results
Valhalla WTP Edenton, Chowan County
Well ID
Date Collected
Chloride
TDS
Total Iron
Total
Manganese
g
Dissolved
Iron
Dissolved
Manganese
g
Temperature
(o )
C
DO
m /L)
( g
Specific
Conduc-
tivi ty
(mS/cm)
Conduc-
tS/c
(MS/cm)
pH
ORP
mV
( )
Turbidity
(NTU)
NTU
Surficial
Aquifer
5/26/2015
3,200
1,963
1,929
7/10/2015
3,350
2,650
1,301
11/12/2015
4,800
4,600
6,600
21.9
0.69
13,466
12,669
6.60
30
1/24/2017
4,100
5,900
3,300
140
2,400
15.5
0.20
13,586
10,930
6.23
80
15
MW3
10/2/2017
2,000
3,200
4,600
<200
4,500
23.8
0.30
6,442
6,229
7.10
8.0
1.07
1/10/2018
5,300
9,200
8,800
11,000
7,700
12,000
17.3
0.75
16,440
13,850
7.29
-30.5
15.4
7/11/2018
2,200
4,000
4,200
2,200
3,100
2,200
22.2
0.33
6,284
5,955
7.15
-138.7
11.3
1/9/2019
4,000
6,900
8,200
4,800
5,800
5,000
17.1
0.84
11,793
9,944
7.11
47.3
12.8
7/1/2019
3,200
5,900
4,300
1,300
<200
1,400
21.6
1.15
9,435
8,842
7.07
106.3
8.15
5/26/2015
1,110
484
31
7/10/2015
1,000
446
33
11/12/2015
460
340
29
19.5
0.75
1887
1688
6.69
-26
1/24/2017
1,100
2,200
87
<100
68
11.8
0.28
4274
3197
7.28
-21
34
MW2
10/2/2017
590
3,700
46
<200
34
22.2
0.32
2066
1957
6.80
-0.6
185
1/10/2018
510
1,100
2,400
62
640
47
14.9
0.55
1833
1469
6.78
-22.5
90.7
7/11/2018
780
1,600
2,400
72
280
72
21.5
0.29
2458
2297
6.60
-66.3
65
1/9/2019
340
780
820
51
380
51
15.1
1.5
1,412
1,158
6.75
-4.1
22
7/1/2019
1,100
2,100
1,700
53
<200
55
20.5
0.96
3,784
3,456
6.90
82.4
5.5
5/26/2015
918
1,001
37
7/10/2015
1,200
2,632
64
11/12/2015
1,000
1,700
48
18.4
0.36
3579
3136
6.11
19
1/24/2017
880
2,600
60
640
56
14.9
0.14
3090
2501
6.53
24
18
MW3
10/2/2017
850
2,100
43
830
43
20.2
0.56
2925
2660
6.76
6.7
19.6
1/10/2018
840
1,500
2,000
35
780
34
13.8
0.58
2699
2124
6.76
56.5
18.1
7/11/2018
410
910
2,200
21
590
20
19.8
0.25
1448
1304
6.65
-76.0
21.1
1/9/2019
710
1,300
1,600
35
600
34
15.0
0.77
2,399
1,944
6.49
52.5
23.6
7/1/2019
710
1,400
2,400
49
<200
44
19.4
0.98
2,485
2,218
6.51
80.2
16.2
4/11/2019
11
140
800
200
<200
190
MW37
7/2/2019
14
1 190
1 520
1 250
<200
240
19.4
6.9
287
256
5.17
119.7
12.3
Shallow Yorktown
Aquifer
1/25/2017
59
13,000
150
<100
56
16.6
0.80
434
384
3.06
305
234
10/2/2017
99
3,700
87
<200
83
17.2
2.07
608
516
7.64
15.2
15.1
1/10/2018
100
420
2,700
88
550
72
16.1
1.60
626
519
7.73
188.5
48.4
MW4
7/11/2018
110
520
2,000
86
370
75
18.2
0.31
606
531
7.42
-65.1
37.6
1/9/2019
130
480
560
76
210
87
16.4
0.23
699
585
7.37
32
7.56
7/1/2019
120
500
600
120
<200
76
18.3
1.05
694
606
7.49
100.3
7.6
1/25/2017
19
200,000
2,200
160
610
17.4
0.39
380
327
6.70
36
OR
10/2/2017
19
28,000
960
10,000
900
18.6
0.36
334
294
5.95
682
140
1/10/2018
19
210
28,000
1,200
8,900
880
17.3
0.70
349.6
296.3
6.47
-46.5
82.9
MW5
7/12/2018
19
210
17,000
840
3,200
830
18.3
0.27
272
237
5.52
101.0
78
1/9/2019
19
230
26,000
870
1,700
830
17.7
0.23
327.7
2,822
6.21
-15.2
45.2
7/1/2019
19
170
17,000
850
<200
870
18.9
0.5
302
267
5.40
105.6
20.1
1/25/2017
17
58,000
860
<100
290
17.7
0.11
503
432
7.18
-20
857
10/2/2017
16
24,000
490
2,900
440
17.9
0.47
397
346
6.72
26
40.8
1/11/2018
16
210
28,000
520
6,900
440
17.6
0.08
405.1
347.6
7.58
-42.5
15.4
MW6
7/12/2018
17
220
23,000
480
4,500
460
18.3
0.15
367
320
7.29
-193.0
24.1
1/10/2019
17
22,000
480
5,500
460
17.6
0.21
388.3
333.8
7.18
-0.7
20.1
7/1/2019
17
23,000
480
<200
500
18.2
1.02
411
358
7.19
15
13.1
1/25/2017
1,400120,000
t60
2,500
18,000
1,800
17.6
0.86
5170
4439
6.62
-1.6
OR
10/3/2017
1,500130,000
2,300
82,000
2,300
17.2
0.46
4419
3764
6.93
-4.8
9.37
1/11/2018
1,500130,000
2,300
86,000
2,200
17.1
0.33
4231
3594
6.34
54.6
33.5
MW7
7/12/2018
1,300
130,000
2,100
63,000
2,000
17.6
0.18
3966
3409
6.73
-139.0
14.5
1/10/2019
1,200
2,300
110,000
1,900
69,000
1,900
17.0
0.81
3,960
3,360
6.43
77.3
16.6
7/2/2019
1,100
2,100
110,000
1,800
50,000
2,000
18.8
1.44
3,956
3,487
6.55
34.5
18.9
1/24/2017
1,100
12,000
1,500
1,100
4,100
17.3
0.18
4429
3776
6.97
41
2.0
10/3/2017
290
13,000
720
470
640
17.5
0.25
1173
1003
7.00
0
49
1/11/2018
41
170
12,000
390
2,000
360
17.2
0.2
335.5
287.1
7.72
-20.3
25.5
MW8
7/12/2018
180
560
13,000
500
1,700
500
18.1
0.2
686.0
598.0
7.32
-169.0
13.5
1/10/2019
700
1,300
24,000
1,100
6,800
1,100
16.9
0.26
2312.0
1939.0
7.22
57.1
11.7
7/2/2019
39
200
15,000
380
<200
360
18.4
0.68
320
284
7.02
76
9.79
1/25/2017
4,200
510,000
13,000
360,000
10,000 E
18.2
1.44
13,110
11,429
5.92
41
284
10/3/2017
3,300
430,000
11,000
380,000
10,000
18.4
0.35
9,600
8,399
6.17
33
105
1/11/2018
5,900
9,500 A
440,000
12,000
400,000
12,000
18.0
0.25
17,520
15,175
6.03
52
180
MW9
7/12/2018
6,800
10,000
420,000
12,000
420,000
12,000
19.6
0.11
16,950
15,238
6.05
-62
75
1/9/2019
7,000
11,000
410,000
10,000
410,000
11,000
17.7
0.35
18,543
15,950
6.00
10.8
81.4
7/2/2019
5,800
10,000
460,000
13,000
360,000
12,000
19.8
1.05
17,224
15,500
6.05
70.2
50.9
1/24/2017
15
18,000
300
<100
240
18.1
0.24
301
261
7.07
6.5
98
10/3/2017
27
16,000
270
13,000
260
18.1
0.35
263
228
6.34
18.7
69.4
1/11/2018
34
180
16,000
300
13,000
280
18.0
1.94
271.4
234.9
6.19
-9.7
21.2
MW10
7/12/2018
46
220
17,000
310
8,300
300
20.2
0.32
275
250
6.02
15.5
27.5
1/10/2019
62
220
19,000
360
16,000
350
17.8
0.27
332.5
2,865
6.04
43.7
25.6
7/2/2019
77
250
24,000
430
14,000
430
19.9
0.98
394
348
6.05
95.3
17.3
201215A NCAC 2L Std.
250 mg/L
500 mg/L
300 ug/L
50 ug/L
NSE ug/L
NSE ug/L
Micrograms per liter (ug/L), is equivalent to parts per billion (ppb). OR = over range (1000 NTU)
Milligrams per liter (mg/L), is equivalent to parts per million (ppm). NTU = Nephelometric Turbidity Unit
Bold = Concentration exceeds Laboratory Detection Limits A = Residue weight is greater than the methods limit of 200 mg. Analysis could not be repeated due to hold time.
Shaded = Concentration exceeds the 15A NCAC 2L groundwater standard NA = Not analyzed
E = Estimated concentration above the calibration range

Table 4. Summary of Groundwater Sampling Analytical Results
Valhalla WTP Edenton, Chowan County
Well ID
Date Collected
Chloride
TDS
Total Iron
Total
Manganese
Dissolved
Iron
Dissolved
Manganese
Temperature
(°C)
DO
(mg/L)
Specific
Conduc-
tivity
(mS/cm)
Conduc-
(MS/cm)
tS/c
PH
ORP
(mv)
Turbidity
(NTU)
Shallow Yorktown
Aquifer
1/24/2017
720
140,000
1,800
44,000
1,500
18.2
0.13
2950
2566
6.71
1.6
27
10/3/2017
720
140,000
1,800
88,000
1,900
18.5
0.32
2693
2358
6.75
-35.6
57.2
MWll
1/11/2018
750
1,300
120,000
1,800
71,000
1,800
18.3
0.54
2522
2205
6.89
-15.0
34.9
7/12/2018
740
1,500
130,000
2,000
48,000
1,800
18.6
0.21
2515
2208
6.75
-151.0
15
1/10/2019
760
1,500
120,000
1,800
77,000
1,900
18.1
0.25
2,679
2,318
6.77
-0.4
17.5
7/2/2019
730
1,500
140,000
1,900
60,000
1,900
19.2
0.46
2,794
2,484
6.76
-4.9
30.9
1/24/2017
3,000
110,000
2,700
38,000
2,400
17.7
0.21
10,210
8811
6.64
12
61
10/2/2017
3,300
160,000
3,700
97,000
3,500
18.3
0.74
9,810
8556
6.18
8
303
1/11/2018
3,200
5,400 A
120,000
3,700
93,000
3,400
17.9
2.73
9,849
8519
6.60
25.3
14.7
MW12
7/11/2018
3,100
6,000
130,000
3,700
75,000
3,500
19.4
0.15
9,080
8135
6.46
-103.7
9.9
1/9/2019
3,300
5,400
120,000
3,500
97,000
3,500
17.8
0.24
9,452
8,160
6.51
-13.3
22.2
7/1/2019
3,300
6,000
140,000
3,900
48,000
3,900
19.1
0.33
10,014
8,897
6.43
20.1
20.2
1/24/2017
16
20,000
710
<100
220
17.9
3.61
522
451
7.63
57
185
10/2/2017
18
430
340
< 200
330
18.9
4.1
483
426
7.16
0
12
1/10/2018
18
290
11,000
420
2,400
360
17.8
1.82
473.7
408.1
7.42
-52.5
32.6
MW13
7/11/2018
20
290
11,000
470
3,400
380
18.9
0.21
437
386
7.39
-141.0
46.3
1/9/2019
21
290
5,400
240
1,600
230
18
3.09
450.4
389.5
7.43
-5.0
33.1
7/1/2019
19
330
6,000
260
<200
240
19.5
4.4
471
421
7.44
99.2
50.4
5/2/2017
8.4
680
160
<100
150
19.5
0.32
570
509
7.10
120
10/3/2017
7.5
1,900
130
<200
130
17.6
0.34
560
481
7.31
-42
5.27
1/11/2018
7.3
330
2,300
140
1,100
120
17.4
3.62
548.8
469.3
7.72
-49.8
14.8
MW14
7/12/2018
6.5
310
2,200
120
1,100
120
18.1
0.41
497
432
7.50
-154.0
11.4
1/10/2019
6.9
340
1,500
120
710
110
17.5
0.52
510.2
436
7.49
5.6
0.82
7/2/2019
5.6
300
1 800
150
1 <200
1 150
1 18.3
1 0.54
1 524
1 457
1 7.52
84.3
12.1
Intermediate
Yorktown
Aquifer
1/25/2017
2,400
43,000
7,500
1,000
5,200 E
17.8
0.13
8421
7271
6.78
22
38
10/2/2017
2,400
66,000
6,800
28,000
6,500
17.9
0.34
7444
6442
6.67
14
130
1/10/2018
2,300
4,100
53,000
6,000
17,000
6,000
17.0
0.3
7436
6315
7.09
-4.5
73.8
MW2D
7/12/2018
2,300
4,000
49,000
5,400
10,000
4,900
18.2
0.21
6640
5788
6.93
-144.0
31.4
1/9/2019
2,300
3,800
46,000
4,600
24,000
4,600
17.6
0.78
6,833
5,882
7.00
-26.6
25
712019
2,100
3,900
51,000
4,300
8,200
4,300
19.2
1.54
6,821
6,075
7.16
65.6
29
1/25/2017
7,500
240,000
2,700
130,000
2,000
18.2
0.13
23,615
20,535
6.49
11
18
10/3/2017
7,300
220,000
2,200
170,000
2,200
18.2
0.32
21,250
18,495
6.63
-35
17.9
1/11/2018
7,000
12,000 A
180,000
2,100
150,000
1,900
18.0
0.13
20432
17698
6.94
17.6
8.42
MW9D
7/12/2018
7,200
11,000
160,000
1,600
110,000
1,700
18.6
0.14
18298
16049
6.77
-137.0
8.5
1/10/2019
6,900
12,000
130,000
1,300
110,000
1,300
17.8
0.17
18,668
16,089
6.80
56.6
6.85
712019
6,400
12,000
130,000
1,300
70,000
1,400
19.5
0.69
18,412
16,441
6.77
40.7
11.8
1/24/2017
14
540
170
<100
160
17.4
0.43
447
383
7.68
17
4.0
10/2/2017
14
920
140
<200
130
18.8
0.72
393
348
7.30
15
10.8
1/10/2018
14
230
800
130
300
120
17.3
0.85
366.5
311
7.26
-12.5
10.7
MW13D
7/11/2018
14
210
600
110
290
100
18.4
1.89
308
271
6.76
-7.9
8.7
1/9/2019
13
230
1,100
980
420
89
17.7
1.09
348.5
249.5
6.93
28.5
10.0
712019
13
230
830
110
<200
97
18.3
0.74
384
334
7.31
110.4
5.8
4/11/2019
1,400
2,600
12,000
1,400
2,100
1,400
MW15
7/2/2019
1,400
3,100
15,000
1,400
2,700
1,400
17.6
0.18
4 477
3,850
7.31
59.8
8.3
Deep Yorktown
Aquifer
4/11/2019
31 470
1,400 64
<200
54
MW16
7/2/2019
30 500
670 71
<200
65 17.9
0.95
788
681
762.00
65.1
14.9
Castle Ha
ne Aquifer
5/2/2017
25
<100
13
<100
13
18.7
0.34
612
540
7.13
171
10/3/2017
160
1,300
110
<200
110
17.9
0.21
1129
977
7.52
-111
1.9
1/11/2018
320
860 1,200
160
690
160
18.0
0.36
1654
1432
7.39
19.2
8.5
MW9DD
3/23/2018
180
NA NA
NA
NA
NA
7/12/2018
970
2,000 7,300
450
4,600
450
19.4
0.09
3310
2965
7.27
-142.0
1.3
1/10/2019
280
820 2,000
150
1,700
150
17.7
0.66
1,271
1,173
7.33
46.0
1.53
Water -Supply
Wells
7/16/2012
82
680
<100
<30
<100
<30
3/23/2018
77
NA
NA
NA
NA
NA
WSWl
7/12/2018
78
630
<100
<100
<100
<30
20.5
2.75
1029
937
8.70
37
80.6
1/10/2019
78
630
<100
<100
<100
<30
7/2/2019
77
670
<200
<30
<100
<30
WSW2
7/2/2019
11
330
11,000
290
<100
250
WSW4
5/26/2016
150
9,200
400
7100
120
17.8
6.57
646
558
5.55
182
5/25/2016
1,100
280
310
270
310
18.8
4.57
3580
3164
4.33
204
2/2/2017
1,200
420
360
340
320
10/2/2017
1,000
<100
340
<200
350
18.9
0.6
3074
2717
4.34
161
0.27
WSWS
1/11/2018
1,000
1,500
190
340
<100
340
18.6
0.2
3005
2636
4.15
125.7
1.86
7/12/2018
790
1,400
<100
460
<100
440
18.2
0.27
2500
2163
4.16
272
2.0
1/10/2019
910
1,500
100
480
<100
450
18.4
0.42
2,830
2,472
4.21
117.7
3.37
7/2/2019
860
1,700
<100
390
<100
390
19.3
1.22
2,923
2 592
4.08
133.4
4.12
201215A NCAC 2L S&.
250 mg/L
500 mg/L
300 ug/L
50 ug/L
NSE ug/L
NSE ug/L
Micrograms per liter (ug/L), is equivalent to parts per billion (ppb). OR = over range (1000 NTU)
Milligrams per liter (mg/L), is equivalent to parts per million (ppm). NTU = Nephelometric Turbidity Unit
Bold = Concentration exceeds Laboratory Detection Limits A = Residue weight is greater than the methods limit of 200 mg. Analysis could not be repeated due to hold time.
Shaded = Concentration exceeds the 15A NCAC 2L groundwater standard NA = Not analyzed
E = Estimated concentration above the calibration range