NC0089109_NOV-20212-SS-0015 Response_20210924

Timeline of Response Actions
July 28 — Initial pond samples, collected during liner repair, showed low pH and metals; liner
repaired and replace to prevent rainwater infiltration.
July 28-Aug 9 — Ponds taken out of service and replaced with tanks
Aug 9 — Sampling and analysis Plan submitted to EPA/NC to assess below ponds, ravines,
and geology/geohydrology
Aug 12 — Plan implementation initiated. Weekly progress reports to NCDEQ. Some delay
due driller availability and rain
Sept 15 — Plan for dewatering below ponds developed. Implementation can begin
immediately
Sept 20 — Installation of soil borings and wells begins (in progress)
AMR ZINC ZIN R RECYECY
CLING
Delivering a Sustainable Future

Below Pond Sampling Locations (North Raffinate Pond - July 28, 2021)
Deepest Soil Sample Results (mg/kg)
Sample Location: HA1 HA2
Sample ID: HA1-2.0-2.92 HA2-1.0-1.75
Sample Date: 7/28/2021 7/28/2021
Start Depth (feet): 2 1
End Depth (Feet): 2.92 1.75
Analyte NCDEQ PSRG Units
Arsenic 5.8 mg/kg 1.2 2.6
Barium 580 mg/kg 18 34
Cadmium 3
Chromium, Total 3.8 (CrVI)
mg/kg 57 41
mg/kg 2.5 18
Lead 270 mg/kg 41 15
Selenium 2.1 mg/kg 1.2 U 5.5 U
Silver 3.4 mg/kg 2.1 0.54 J
mg/kg
Mercury 1 mg/kg 0.036 J 0.081 U
pH SU 1.8 3.3
Zinc 'n. 1200
21k3
2AMR
Deii„eri.,y a sustainable Fuwra
AMERICAN
ZINC RECYCLING

Interim configuration
Doubidi Iln!d p.nd
Autorn1i. off vahre
F R.P buffer tank
I II
I
QperraIing level
Elevation view of concept
Fr'rn 4apietIon To gmE:L i GrecIG
T T T T T T
6
DepleFtecl ulTs r tin k
Raffinate to leach R M
FRR'ump tank
A4i' r.is1k elnuti1J '4T vahre
RallInala from 5 M
IP—zi
T T T T T T T T T
'sF11rts1ai buffer -tank. I ]
FF
l 1 1 1\ 1 1 1 1 1 1 1 1 1 1 NAL:11.111111.......
Ponds scrwc as rrrr }Iaili mkt
2IN A CLING

Access for environmental assessments
R to leasc h is
Depleted solution pond
Ra#fi n ate pond
ikii.4mritelegleuwC
Cm.wrra ■ S.rar.lnr r,...rt

Liquid samples from augered borings below ponds
Sample Location:
Sample ID:
Sam p e Date:
HA1
HA1
7/28/2021
HA8
HA8090821
9/8/2021
CAS No.
Analyte
NC GW
Units
7440-38-2
Arsenic
10
pg/L
380 ]
78.8
7440-39-3
Barium
700
pg/L
4600
300
7440-43-9
Cadmium
2
pg/L
240000
32200
7440-47-3
Chromium, Total
10
pg/L
2900
1450
7439-92-1
Lead
15
pg/L
20000
289
7439-97-6
Mercury
1
pg/L
0.61
0.2 U
7782-49-2
Selenium
20
pg/L
1200
156
7440-22-4
Silver
20
pg/L
800
20.3
7440-66-6
Zinc
1000
pg/L
15000000
19700000
PH
pH
—
SU
NA
1.33
TOC
Total Organic Carbon
—
pg/L
NA
41300
Abtes:
CAS No. = Chemical Abstracts Service number
NC GW = North Carolina 15A NCAC 02L .0202 Groundwater Standards (April 2013)
U.S. EPA = United States Environmental Protection Agency
pg/L = micrograms per Titer
SU = standard units
NA = not analyzed
U = not detected
J = estimated value
Bold = Detected
Highlight = Exceeds NW GW
5AMR
oeii„eri.,y a Sustainable Fuwra
AMERICAN
ZINC RECYCLING

Pond (Raffinate/Depleted/Maint/Stormwater) Soil Boring Locations
11 soil borings are being advanced utilizing a
DPT drill rig in the general locations depicted by
the green dots on the map.
2. Soil from each location will be screened in 1-foot
intervals with a handheld XRF to determine
sample intervals. Interval samples will be sent to
the onsite laboratory for analysis.
Samples from at least 2 intervals in each soil
boring will be collected for laboratory analysis.
5 of the soil borings in the pond area will be
converted to 2-inch monitoring wells based on the
XRF field screening, potential to make water,
and/or soil sample results from the onsite lab.
2 other groundwater only wells will be installed to
the east and southeast of the pond area. These
wells will be used for hydrogeological information.
6
AMR
AMERICAN
ZINC RECYCLING
DeLiveri.,y a Sustainable Future

AZP Pond Investigation
Proposed Boring Locations
• Proposed Soil Boring Location
• Proposed PiezometerLocation
SB-01
13
SB-03
15.5
SB-05
current
location
Google Earth
PZ-01
49
Legend
7
AMR
AMERICAN
ZINC RECYCLING
oenveri0y a Sustainable Future

West Ponds Investigation Cross -Section (Depleted Solutions and Raffinate Pond)
North
Concrete pump well
Depleted Solutions Pond
HA6
Sand/Gravel Layer
Cd Concentrations
exceeding 3 mg/kg Line
[ Hand Auger Location
I
Proposed Soil Boring Location
HA7
Pump
Pump
Concrete pump well
HA1
1
Approx. 5 feet below liners
Raffinate Pond
HA2
= pH between 7 and
a pH between 6 and
aZ
w = pH between 4 and
pH Tess than 4 AMR
pH between 5 and
HA5
South
Sand/Gravel Lay
AMERICAN
ZINC RECYCLING
DeLiveri.,y a Sustainable Future

West Ponds Investigation Cross -Section (Depleted Solutions, Raffinate Pond, and Maintenance)
Concrete pump well
Depleted Solutions Pond
HA
7
Sand/Gravel Layer
Pump Pump
Concrete pump well
Hq HA
THA
1—zjFl 5
Raffinate Pond Raffinate Pond
Sand/Gravel Layer
HA8 = Hand Auger Locations Containing
Liquid
Concrete pump well
Maintenance Pond
HA
9
Sand/Gravel Layer
Pump
Stormwater
Pond
AZRAMERICAN
ZINC RECYCLING
Delivering a Sustainable Future

N
t
Soil/Bedrock Interface
Ravine 4
. t itw_'_�z_ nat'i - _+'•.-' L_- � �r�uLr- _-ntt'}. 3.•.. L__ ,ii!�._'_tz.-.mot. __r � ,._. ,..__. � �.. _ .. r__ n�ft'. � :�.•._. ..__.. :r _ ...f. ? .•.. ,..__. i �r.��_"z_-..i• i.. _+ .. _..___ ,� �•�u_C- _-e+i'_'r •

Surface Water Sample Results from Ravines 4, 5, and 6: August 18, 2021
AZP - Mooresboro, NC
Ravine
Ravine 4
Ravine 5
Ravine
Sample Location
1
2
3
4
4
5
6
6
7
8
9
1
2
3
4
1
Sample ID
R4-1-
WS
R4-2-
WS
R4-3-
WS
R4-4-
WS
R4-4D-
WS
R4-5-
WS
R4-6-
WS
R4-6D-
WS
R4-7-
WS
R4-8-
WS
R4-9-
WS
R5-1-WS
R5-2-WS
R5-3
R5-4-WS
R6-1-W
Samp e Date
8/18/2021
NA
8/18/2021
NA
Method
CAS
No.
Analyte
Units
Results Ng/L
6020E
7440-
38-2
Arsenic
Ng/L
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
NA
<1.0
<1.0
NS
<1.0
NA
6020B
7440
39-2
Barium
Ng/L
37
35
37
35
34
31
25
23
24
24
NA
15
13
NS
10
NA
6020B
7440
43-9
Cadmium
Ng/L
74.6
80.2
90
118
120
155
131
128
<1.0
2.8
NA
<1.0
<1.0
NS
<1.0
NA
6020B
16965-
83-1
Chromium
Ng/L
<2
<2
<2
<2
<2
<2
<2
<2
<2
2
NA
<2
<2
NS
<2
NA
6020B
7439-Lead
92-1
Ng/L
<1
<1
<1
1.0
1.1
1.8
3.6
3.6
5.4
22.4
NA
<1
<1
NS
<1
NA
6020B
7439-
97-6
Mercury
(Total)
Ng/L
<0.20
<0.20
<0.20
<0.20
<0.20
<0.20
<0.20
<0.20
<0.20
<0.20
NA
<0.20
<0.20
NS
<0.20
NA
6020B
7782
49-4
Selenium
Ng/L
<5
<5
<5
<5
<5
<5
<5
<5
>5
<5
NA
<5
<5
NS
<5
NA
6020B
7782
22-4
Silver
Ng/L
<1
<1
<1
<1
<1
<1
<1
<1
<1
25.6
NA
<1
<1
NS
<1
NA
6020B
7440
66-6
Zinc
Ng/L
2800
3020
3330
4510
4460
5820
4870
4670
103
256
NA
<20
<20
NS
113
NA
4500H+B-
2011
NA
pH
s.u.
5.18
5.55
5.36
4.87
5.03
5.12
5.38
5.38
6.20
5.64
NA
6.59
5.96
5.67
6.44
NA
Notes:
NA = Not Analyzed. No water present.
D = in sample identification indicates a duplicate
NS = Not sampled due to potential interference with iron bacteria flocculant; field water quality parameters collected only
11AMR
Deu„eri.,y a sustainable Fuwra
AMERICAN
ZINC RECYCLING

Sediment Sample Results from Ravines 4, 5, and 6: August 18, 2021
AZP - Mooresboro, NC
Ravine
Ravine 4
Ravine 5
Ravi
Sample Location
1
2
3
4
4
5
6
6
7
8
9
1
2
3
4
7
Sample ID
R4-1-
SED
R4-2-
SED
R4-3-
SED
R4-4-
SED
R4-4D-
SED
R4-5-
SED
R4-6-
SED
R4-6D-
SED
R4-7-
SED
R4-8-
SED
R4-9-
SED
R5-1-
SED
R5-2-
SED
R5-3
R5-4-
SED
R6
SE
Sample Date
8/18/2021
Units mg/kg
Method
CAS
No.
Analyte
Units
6020B
7440
38-2
Arsenic
mg/kg
<1.34
<.1.36
<1.29
1.91
1.49
<1.36
1.75
<1.27
<1.29
1.37
2.79
<1.33
<1.45
NS
5.64
2.
6020B
7440
39-3
Barium
mg/kg
19.9
<13.6
<12.9
<13.7
14.6
<13.6
<12.4
<12.7
<12.9
39.0
41.7
15.7
18.0
NS
66.3
9E
6020B
7440
43-9
Cadmium
mg/kg
2.89
2.25
1.52
3.74
5.06
0.864
1.62
0.980
<0.644
<0.630
15.9
<0.667
<0.725
NS
<0.882
<0.
6020B
7440
47-3
Chromium
mg/kg
14.5
3.27
1.86
11.2
16.0
1.65
7.83
1.92
2.73
10.7
25.1
8.28
13.3
NS
27.2
27
6020B
7439
92-1
Lead
mg/kg
4.77
5.44
4.94
19.2
16.9
2.97
9.58
3.85
3.31
17.4
47.6
4.12
4.46
NS
30.0
1E
6020B
7439-
97-6
Mercury
(Total)
mg/kg
<0.0403
<0.0409
<0.0386
<0.0412
<0.0413
<0.0407
<0.0371
<0.0380
<0.0387
0.0378
<0.0385
<0.0400
<0.0435
NS
<0.0529
<0.0
6020B
7782
49-2
Selenium
mg/kg
<2.68
<2.73
<2.57
<2.74
<2.75
<2.71
<2.48
<2.53
<2.58
<2.52
<2.56
<2.67
<2.90
NS
<3.53
<2
6020B
7440
22-4
Silver
mg/kg
<0.671
<0.682
<0.643
<0.686
<0.689
<0.678
<0.619
<0.633
<0.644
<0.630
<0.641
<0.667
<0.725
NS
<0.882
<0.
6020B
7440
66-6
Zinc
mg/kg
72.3
56.1
43.8
84.5
110
31.2
56.6
33.8
14.3
34.5
296
17.6
<14.5
NS
121
47
9045D
pH
s.u.
5.84
5.89
5.61
5.69
5.60
5.25
4.93
5.03
6.09
5.34
5.85
6.43
6.01
NS
5.49
5.
SW
DRYWT
Moisture
%
25.5
26.7
22.2
27.1
27.4
26.2
19.2
21.0
22.4
20.6
22.0
25.0
31.0
NS
43.3
37
Notes:
All results are reported on dry weight basis.
D = duplicate sample
NS= Not sampled due to potential interference with iron bacteria flocculent
12AMR
Delivering a Sustainable Future
AMERICAN
ZINC RECYCLING

13
AMERICAN
ZINC RECYCLING
DeU Briny a Sustainable Future

LEGEND
SEDIMENT - RAVINES
O SURFACE WATER
O OTHER
NAO 1983 STATE PLANE
NORTH CAROLINA FEET
0 200 400
SCALE IN FEET
SAMPLE LOCATIONS MAP
AMERICAN ZINC PRODUCTS
484 HICKS GROVE ROAD
MOORESBORO, NC 28114
REQUESTED BY:
AW
DATE
8/25/2021
PROJECT:
0888824799
EJuSAFE
Source Ean, Ma.ar, GeoEve, Earmaur Geo, aphis. CNES/Antos DS, USDA, USGS, AeroGRID. MK and me GIS user Commomr
14
ZRAMERICAN
ZINC RECYCLING
D Liv tiny a Sustainable Future

Proposed Permeable Recovery Trench — Process Ponds
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MAT`� QE.p��cl"j
• 7 Wo,S?,
l9PE uc1E�_ 1N�AI P{�
c� -� wdsu "ZcN
c..c
a
15
a
o b . 6 0 0 aq
4 0
0. a e o
60
e
d � °
4
t'E�FcRGC!ccd p
0 r
Vi a, _ .�:.177��n for wTF1 a-J 7 76— 7 of
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AZR
AMERICAN
ZINC RECYCLING
DeLn,eri0y a Sustainable Future

Below Pond Sample Locations (Depleted/South Raffinate/Mainz
Sand/Gravel layer (if present) below liners will be
cleared to top of soil (approx.1.0 to 1.75 feet)
Samples will be collected via hand auger to a depth
of 3.0 feet or refusal, whichever is shallower.
Once sand/gravel has been removed, sample
intervals will be 0.0 to 0.5 feet and 2.5 to 3.0 feet in
underlying soil.
One location from each pond will be advanced until
refusal or hand augering becomes impractical.
Sampling will not advance if free liquid is noted;
however, liquid will be sampled.
6. Samples will be analyzed for 8 RCRA metals +
Zinc, and pH. Samples will be split with onsite lab
and third -party lab.
Pond sampling planned for Wednesday August 11
except for maintenance pond which may be a week
later. 6ZR ZR ECYCY
ZIINCNC RCLING

Proposed Surface Water/Soil Sampling
17
Surface water will be collected from 3
different ravines onsite (Ravine 4, 5 and 6)
at the locations specified in the map.
Up to 12 surface water samples per event
will be collected based on flow and
availability of water.
Up to 12 sediment samples will also be
collected in these areas where pooling of
surface water is located.
Samples will be analyzed for 8 RCRA
metals + Zinc, and pH. Samples will be
split with onsite lab and third -party lab.
Conduct a receptor assessment during
surface sediment/water sampling
RZ'1/4INC R CY
ZINC RECYCLING
Delivering a sustainable Future