NC0089109_Monitoring (Report)_20210924

AZP West Ponds Investigation SAP Modifications 2021
MSAFE
MWOMMON-
creative thinking. custom solutions.
Technical Memorandum
To: Charles Howell — Environmental Manager— American Zinc Products
Timothy Basilone — Vice President Environmental Affairs —American Zinc Recycling
From: EnSafe
Re: American Zinc Products (AZP) — Mooresboro, NC — West Ponds Investigation SAP Mod
Date: August 25, 2021
Upgradient Groundwater Wells Construction Modification
The West Ponds Investigation Sampling and Analysis Plan (SAP) submitted on August 9, 2021
stated that two groundwater monitoring wells would be installed to the southeast and east of the
pond area. The wells would be installed to cross the vadose zone and would provide info on the
areas groundwater elevation. To meet this objective, we will install these as piezometers (PZs) and
they will be constructed with 1-inch PVC casing.
Upgradient Groundwater Piezometer Location Modification
The SAP stated that a well (piezometer) be placed on the southeast and east sides of the facility to
aid in determining groundwater flow direction. EnSafe has inspected the proposed area and has
determined that the surface elevation for the far eastern PZ is well below the surface elevation of
the west ponds. This extreme gradient will not aid in determining flow direction for the west ponds
investigation. EnSafe would like to move the far eastern piezometer to the northern boundary of
the site as seen in the proposed boring/well location map below.
Proposed Boring Location Adjustments
As discussed in the SAP up to 5 of the proposed boring locations will be converted to 2-inch PVC
monitoring wells pending review of the lithology and potential to produce groundwater. The
locations listed in the original map have been adjusted slightly due to the location accessibility. The
locations listed in the map below are proposed and are under review by the onsite utility group to
ensure no subsurface utilities conflict with the boring locations. EnSafe is planning to review each
location with members of AZP the week of August 30th to ensure the boring areas are free of
subsurface utilities and that the locations are accessible via drill rig.
1

AZP West Ponds Investigation SAP Modifications 2021
Proposed Soil Boring Location
Proposed . ocation
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4iC- •,L r � a w a ti
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Subsurface Soil and Groundwater Sampling Schedule
Currently EnSafe is planning on mobilizing to site on September 30' to begin on the subsurface soil
and groundwater sampling scope of work. Drilling and well install is estimated to take 3 to 4 days.
Once the groundwater monitoring wells and PZs have been installed, they will be developed no
sooner than 24-hours after installation to allow the well materials to "cure". Sampling and
measuring groundwater elevations will not occur sooner than 24-hours after initial development.
With the required time after install for curing and equilibration the sampling event is currently
scheduled for the week of September 27t"
2

AZP West Ponds Investigation SAP Modifications 2021
Surface Water and Sediment Sampling
One round of surface water and sediment sampling has been completed. This followed a large rain
event. A second sampling is being planned to determine concentrations during drier weather. In
addition, hardness has been added to the list of constituents to be analyzed.
Maintenance Pond Sampling
The plant is completing installation of a replacement above grade tank in the Maintenance Pond.
Sub-liner sampling of this pond in accordance with the Sampling and Analysis Plan is scheduled for
August 31, 2021.
3

ENSAFE
ews—
creative thinking. custom solutions.
August 9, 2021
American Zinc Products LLC
Attention: Mr. Timothy R. Basilone
Vice President, Environmental Affairs
484 Hicks Grove Road
Mooresboro, North Carolina 28114
Re: Sampling and Analysis Plan — Process Ponds
American Zinc Products
484 Hicks Grove Road
Mooresboro, North Carolina 28114
BACKGROUND
The American Zinc Products facility is approximately 196 acres in size and is located at 484 Hicks
Grove Road in Mooresboro, North Carolina. A Site Layout Map has been included as Figure 1A.
Primary operations at American Zinc Products (AZP), consist of zinc metal production via solvent
extraction and electrowinning.
During the week of July 25, 2021, the plant initiated a program to replace the liners within a
process pond called the Raffinate Pond which is located on the west side of the facility.
AZP engaged EnSafe Inc. to observe the surface beneath the liner system and conduct sampling
as warranted to determine whether there had been a release from the pond. Upon removal of
the liner system, EnSafe Inc. personnel installed shallow, hand-augured borings at two locations.
Soil samples from these borings, conducted at intervals from 6 inches to 3 feet, were submitted
to an independent laboratory for analysis; however, to provide more rapid data, split samples were
also submitted to the in-plant QA/QC laboratory for analysis. Results of the in-plant analysis
showed soils with low pH. Further, cadmium, lead, and zinc, which are constituents of the
Raffinate process were also detected.
It could not be determined whether the release was the result of a recent failure of the liner system
or from historical operations. However, AZP personnel provided release notification to the
National Response Center, United States Environmental Protection Agency (U.S. EPA) and to the
North Carolina Department of Environmental Quality (NCDEQ) on Thursday, July 29, 2021.
The facility initiated the development of a response plan immediately. This work plan is being
submitted as part of that response plan. The Raffinate Pond which was the subject of testing is
one of three process ponds that are generally co-located on the western side of the plant.
AZP has determined that the other two process ponds should be included in the following response
plan as they are similarly designed and operated.
ENGINEERING I ENVIRONMENT I HEALTH &SAFETY I TECHNOLOGY
5724 Summer Trees Drive I Memphis,Tennessee 38134 1 P 901-372-7962 1 F 901-372-2454 1 www.ensafe.com

Sampling and Analysis Plan — Raffinate Pond Release
American Zinc Products; Mooresboro, North Carolina
August 9, 2021
Page 2
Physiographic and Topographic Setting
The Site is located within the Southern Outer Piedmont physiographic province of North Carolina,
which is characterized by low rounded hills and ridges, and low to moderate gradient streams.
Rainfall amounts in this region vary from 40 to 50 inches per year. The predominant rock type in
the vicinity of the Site consists of Cambrian to Late Proterozoic age schist, mica schist, and biotite
gneiss. Soil types consist primarily of fine, kaolinitic, thermic Typic Kanhapludults (Cecil, Appling,
and/or Madison series). Soil pH levels associated with the Cecil, Appling, and Madison series range
from moderately acidic to very strongly acidic (Omernik & Griffith 2008). Elevations at the Site
range from approximately 880 feet above mean sea level (amsl) along the eastern property
boundary, to approximately 680 feet amsl near the northern property boundary (USGS 2014).
Pre-Construction Geotechnical Evaluation
Geotechnical investigations were performed at the Site in 2011 and 2012, prior to the construction
of the active facility. Results of the investigations were presented in the Subsurface Exploration,
and Subsurface Exploration — Addendum 1 reports submitted by S&ME, Inc. in July, and
December 2011, respectively. A subsequent geotechnical investigation was performed in 2012
along the railyard at the facility, as reported in the Geotechnical Exploration Report—Horsehead
Facility—Retaining Wall at Rai/yard(S&ME 2012). Four geotechnical borings were completed in
the vicinity of the west ponds. These borings were identified as follows, in the abovementioned
reports: B-2, B-4, B-6, and B-16. A map depicting the location of historical geotechnical borings
overlaid on the current site configuration has been included as Figure 2.
Boring logs for geotechnical borings completed in the vicinity of the west ponds show that partially
weathered rock, which was encountered in three of the four of the borings in the area, was
reported at depths ranging from 0 to 28 feet below the surface.
Constituents of Potential Concern
The constituents of potential concern (COPCs) associated with the Raffinate solution consist
primarily of the following: sulfuric acid, cadmium, chromium [total], lead, and zinc.
Initial Investigative Measures
On July 28, 2021, two hand auger locations were advanced to a depth of 2.92 feet in HA1 and
1.75 feet at location HA2. Hand auger locations from the initial investigative measures can be
found as Figure 3. It was noted that immediately beneath the lower liner system was a layer of
sand/gravel ranging from 0.8 foot to 2.0 feet thick. Below the sand/gravel layer was a red brown
clay that contained traces of sand and mica along with frequent gravel sized rocks. Liquid was
encountered within the hand auger boring at HA1 around 15-inches below the surface. The
analysis of samples by the onsite laboratory was completed on July 29, 2021 and indicated impacts
to the soil and water below the north side of the Raffinate Pond; however, it does not appear that
the water sampled is true groundwater; it is more likely to be interflow stored in the sand/gravel
layer.
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Sampling and Analysis Plan — Raffinate Pond Release
American Zinc Products; Mooresboro, North Carolina
August 9, 2021
Page 3
Mitigative Measures Implemented
Following confirmation of the Raffinate Pond release, AZP implemented the following response
actions:
Installed a new double layer liner system
All connections of the liner to the pump well were sealed
• Began development of an alternative process plan to enable access to the process ponds
for investigation and remediation, if required.
Conducted a surface water survey downgradient of the ponds and collected samples in two
locations in the nearest ravine to the process pond area.
Process Modification to Accommodate Response Plan
As described below, AZP has temporarily converted the Raffinate Pond (FE-211) and Depleted
Solution Pond (FE-212) to storage tanks with the liner system serving as secondary containment
in order to provide access to the ponds for soil assessment.
This interim configuration consists of a fiberglass reinforced plastic (FRP) storage and pump tanks,
with a high-density polyethylene (HDPE) piping connection between the two tanks. The proposed
modification from the original (as-built) configuration to the proposed interim configuration is
shown in Figure 1B.
From depletion To gypsum Qrecio Raffinate to leach SX Raffinate from$X
11— Depleted soln pond Raffinate pond
Original configuration.Double liner serve as primary and secondary containment
Automatic shut off valve Automatic shut off valve
From depletion To gypsum precip. Raffinate to each SX
Raffinate from sx
oepleted buffer tank Raffinate buffer tank
Planned interim configuration.Ponds serve as lined secondary containment.
Figure IB. Original configuration(top)and proposed interim configuration(bottom).
MsnFE

Sampling and Analysis Plan — Raffinate Pond Release
American Zinc Products; Mooresboro, North Carolina
August 9, 2021
Page 4
Key features of the proposed interim configuration for the two ponds are as follows:
• Process solution will flow under gravity from the SX circuit, directly into the horizontal
buffer tank, which is connected to a vertical pump tank, placed inside the existing pump
wet well. The solution will be pumped from the vertical pump tank to the next process
stage.
• The pump speed will be controlled to maintain the level in the tanks at a constant value.
• An automatic shut off valve will also be installed in the pipe feeding the buffer tank, to limit
the risk of overflowing the tank.
• In this configuration, the lined ponds will serve only as secondary containments, receiving
rainwater, falling on the footprint of the pond. Any liquid in the pond will be pumped back
into the tanks, or to the metals removal circuit, which is common practice with all secondary
containments onsite.
• The system will provide good access for visual inspection of the integrity of the tanks,
piping connection and pond liner, eliminating the reliance on tell-tale pipes.
Preliminary Conceptual Site Model Summary
Based on analysis of available information summarized above and from the initial site investigation,
it appears that the primary pathway for liquid migration beneath pond liner exists within the
underlying sand/gravel layer. This unconsolidated sand/gravel layer, which underlies the footprint
of the Raffinate Pond and is assumed to be under the other ponds, is the likely geologic unit
providing storage for any released liquids from the ponds.
Other pathways into the subsurface have not yet been identified.
Preliminary Summary of Environmental Receptors
The Conceptual Site Model Preliminary analysis of environmental receptors, should a release have
occurred, include release to interflow and/or groundwater, release to offsite drainage in
intermittent drainage regimes, potential exposure to biota through surface water and sediment,
and potential human dermal and ingestion exposure through surface water and groundwater.
Each of these pathways will be evaluated as data is available as to whether the pathways are
complete and further evaluation is warranted.
ENSA FT

Sampling and Analysis Plan — Raffinate Pond Release
American Zinc Products; Mooresboro, North Carolina
August 9, 2021
Page 5
The potential for exposure to humans through the groundwater pathway is being actively
researched: Research conducted for the Initial Site Review (ISR) report includes an environmental
database search, which identified only one well proximal to the Site. This well is reportedly a
public water supply well located near the southwest corner of the parking area of the primary
administrative building and has a designation as NC0181485. According to the NCDEQ, this well
was constructed in 1977 and permitted for Hicks Grove Methodist Church to serve less than
101 people; the well is listed as closed. Currently, all water used for potable or production
purposes by AZP is obtained from the town of Forest City, and not from onsite wells. Interviews
with Site personnel during EnSafe's February 2020 Site visit indicate there may be one private well
located in the general site area, but details of its location, use (likely lawn irrigation as city water
is readily available), well depth, and or well construction were not known. EnSafe has requested
well records for public and private wells in the area from NCDEQ and the Rutherford County
Health Department but has not received a response.
DATA OBJECTIVES
The principal source of potential concern, which is the subject of this investigation, includes the
presence of free liquid migrating through the surrounding strata and into surface water features.
The primary data gathering objective is to determine if the Raffinate has impacted the area
surrounding the ponds via groundwater or interflow and consequently to surface water/sediment.
This Sampling Plan precedes a broader investigation to be completed under the RCRA 3013 Order
following the U.S. EPA's review of the ISR. In addition to gathering the information intended to
satisfy the questions above, additional information as to the subsurface layers including the
compacted fill unit and the elevation of the groundwater of the nearby area will be gathered.
The purpose for collecting soil information is to determine the presence of potential residual metals
concentrations and the vertical extent of elevated concentrations. Furthermore, soil sample
information will be used to determine if potential metals may have entered the uppermost water
bearing zone, which may be intermittent.
FIELD SAMPLING AND ANALYSIS
Field activities and data validation will be performed in general conformance
with United States Environmental Protection Agency Region 4, Science and Ecosystem
Support Division Field Branches Quality System, and Technical Procedures available at
http://www.epa.gov/region4/sesd/fbqstp/index.html. Additionally, field sampling will be
performed in accordance with a site-specific Health and Safety Plan to ensure that onsite
EnSafe employees are properly trained in accordance with Occupational Safety and Health
Administration 29 CFR 1910.120. The Health and Safety Plan will include operating procedures to
address site-specific hazards and will make recommendations on appropriate personal protective
equipment and associated action levels.
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Sampling and Analysis Plan — Raffinate Pond Release
American Zinc Products; Mooresboro, North Carolina
August 9, 2021
Page 6
Field activities will be performed in a phased approach, in order to adequately assess impacts to
the environment.
Phase 1A— Sub-liner Hand Auger Sampling
In order to assess the subsurface soils below the Depleted Pond, southern end of the Raffinate
Pond, and the Maintenance Pond hand auger borings will be advanced to an estimated depth of
3 feet into soil or refusal, whichever is shallowest. Previous investigations in the northern end of
the Raffinate Pond revealed a sand/gravel layer just below the pond liners. This sand layer will
be removed via a two-person gas powered auger prior to commencement of the hand auger
sampling. If needed temporary polyvinyl chloride (PVC) casing will be installed to prevent hole
collapse. Sample intervals for the hand auger sampling will be 0.0 to 0.5 feet and 2.5 to 3.0 feet
into the soil underlying the sand/gravel layer. One location from each pond will be advanced until
refusal or hand augering becomes impractical. Proposed hand auger locations can be found in
Figure 4.
Sampling of the Depleted Solutions Pond and the Raffinate Pond are planned for week of
August 9, 2021. Sampling of the Maintenance Pond will be implemented after the plant has
drained the pond which may be the following week.
Phase 1B — Subsurface Soil and Groundwater Investigation
Near Pond Borings
Soil borings will be advanced via direct push technology to refusal which is expected at depths
from approximately 10 to 60 feet below ground surface at 11 locations near the operating
Raffinate, Depleted, Maintenance, and Storm Water Ponds. Soil boring locations near the pond
will be placed as to assist in determination the vertical and horizontal extent of contamination (if
present) and in areas accessible by a drill rig. At least five of these soil borings will be converted
into 2-inch monitoring wells for groundwater sampling.
Near pond soil boring sampling will consist of screening continuously collected soil samples with a
hand-held XRF machine to identify potential sampling intervals within the soil. If this becomes
impractical or the samples are moist, sample intervals may be submitted to the onsite laboratory
for screening analysis to determine which intervals are submitted to the third-party offsite
laboratory.
Upgradient Groundwater Wells
Two groundwater monitoring wells will be installed to the southeast and east of the pond area.
Wells will be installed to cross the vadose zone and will provide information on the site wide
groundwater elevations.
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Sampling and Analysis Plan — Raffinate Pond Release
American Zinc Products; Mooresboro, North Carolina
August 9, 2021
Page 7
Proposed soil boring and monitoring well locations can be found in Figure 5.
Methodology: Soil sample intervals will be composited in plastic bags and placed in an
appropriate container. If encountered, groundwater samples will be collected via a peristaltic
pump and Teflon tubing using low-flow techniques. Sample water will be placed into the
appropriate containers and will be unfiltered and acidified (with several drops of ultrapure
nitric acid).
Monitoring wells will be constructed of 2-inch diameter PVC casing coupled to 10 feet of 0.01-inch
slotted PVC casing. The annular space around the slotted casing and 2 feet above the slotted
casing will be filled with 20/30 silica sand, topped with a 2-foot bentonite seal to 1-foot below the
ground surface. Neat cement grout will not be used as to reduce the likelihood of effecting the
pH of the water within the well. The wells will be completed with a 3-foot by 3-foot square
concrete pads and stick up well casings or a 2-foot by 2-foot square concrete pad with flush mount
surface casing, whichever is practical for the well location. Each stickup well will contain at least
three protective bollards painted safety yellow.
Lab Analysis: Soil will be analyzed for the 8 RCRA metals and Zinc using U.S. EPA Method 6020
along with pH using method U.S. EPA Method 9045D. Groundwater will also be analyzed for the
8 RCRA metals and Zinc however field screening of groundwater at each location will be performed
using a multi-parameter water quality meter to measure pH and specific conductance. Other
parameters such as temperature, oxidation-reduction potential, and dissolved oxygen will also be
collected during groundwater sampling.
QA/QC., Sample duplicates will be collected at a frequency of 1:20.
Contingencies: Soil sampling will cease once groundwater or interflow is encountered to prevent
possible contamination of the underlying lithology.
Sampling Frequency: Groundwater sampling will be conducted quarterly to determine seasonal
variations in the underlying aquifer. Groundwater would be sampled quarterly for the first year,
at which time the data will be evaluated to determine if more or less frequency is needed
Boring Abandonment
Upon completion of sampling, all boreholes will be abandoned using a bentonite slurry, installed
via tremie pipe, to the native soil surface below the gravel layer, in accordance with North Carolina
Administrative Code, Title 15A, Subchapter 2C, Section .0113 (NCDENR 2009). The annular space
in the PVC casing will be filled with high strength concrete to maintain the integrity of the
surrounding gravel layer, and ground surface will be restored to its original form (to the
extent feasible).
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Sampling and Analysis Plan — Raffinate Pond Release
American Zinc Products; Mooresboro, North Carolina
August 9, 2021
Page 8
Phase 2 — Surface Sediment and Water Sampling
The approach will include an initial recon of the full traces of Ravines 4, 5, and 6; sample locations
will be flagged and revisited to collect samples as part of the sampling activities. The planned
approach is a systematic evaluation of surface water and sediment in the Ravine 4; and
establishment of conditions in unimpacted Ravines 5 and 6. This systematic approach will consist
of sequential sample collection beginning at lowest end of Ravines 4 and 5 and progressively
moving upstream to avoid disturbance to surface water and sediment in each channel. Ravine 6
will be sampled prior to the confluence with Ravine 5. In the case of Ravine 4, sequential sampling
will begin at the discharge point area at Broad River and continue up the channel until it reaches
the headwall at the head of the ravine. Proposed sample locations can be found in Figure 6.
Activity: Sampling activities will consist of collection of nine paired surface water/sediment
locations along the central trace of Ravine 4, beginning at the discharge point to Broad River, and
continuing to the ravine headwall, two along the central trace of Ravine 5, and one along the
central trace of Ravine 6 prior to the confluence with Ravine 5.
Methodology: Surface water samples will be collected as unfiltered acidified (preserved with
several drops of ultrapure nitric acid) by submerging the sample container in pooled water. The
surface water sample will be collected first to minimize turbidity in the sample. Sediment samples
will be collected from pool bottoms using a stainless-steel scoop and placed in an appropriate
container.
Lab Analysis: Surface water and sediment samples will be analyzed for RCRA Metals + Zinc.
Field screening of surface water at each location will be performed using a multi-parameter
(temperature, pH, specific conductivity, oxidation-reduction potential, and dissolved oxygen)water
quality meter.
QA/QC.• Sample duplicates will be collected at a frequency of 1:10.
Contingencies: In the event the presence of surface water is determined to be truly intermittent,
sampling will be preferentially scheduled following a wet weather event. Ravine 1 typically has a
perennial stream flow — this will used as a gauge to make a decision that the other ravines may
be flowing. A rain gauge will be will also be installed onsite to determine site-specific rainfall
amounts.
Seasonal variation: Sampling will be conducted during a dry season and a wet season,
beginning immediately as summer is considered a wet season.
Additional: The chemical signature of the process ponds on the northwest side of the plant is
known; however, the bulk chemistry and leachability of indigenous residuum and weathered
bedrock is not. If reasonable exposures of each are found during recon of Ravines 5 and 6,
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Sampling and Analysis Plan — Raffinate Pond Release
American Zinc Products; Mooresboro, North Carolina
August 9, 2021
Page 9
samples will be collected of each media and submitted for bulk chemistry analysis, and
Synthetic Precipitation Leaching Procedures to quantify leachability.
Global Positioning System
To the extent feasible, sample locations will be recorded via a handheld global positioning system
instrument. Such coordinates will be used to produce site maps and summary figures.
Investigation Derived Waste
Potential investigation derived wastes (IDW) include decontamination water, soil cuttings, and
foundation debris. IDW will be placed in 55-gallon steel drums and temporarily staged at a
designated location onsite. Following receipt of laboratory samples collected during the
investigation, IDW will be transported and disposed of at a licensed disposal facility.
Data Review
Following receipt of analytical data, EnSafe will prepare a brief letter report to summarize field
activities, present analytical data, and to summarize findings of the investigation. The letter report
will include data summary tables and figures displaying sample locations. Analytical data
associated with soil samples will be screened against site-specific background values, as
determined during previous field investigations performed at the Site in 2015, and as reported in
EnSafe's Investigation Summary Report, dated July 2015, along with the NCDEQ Preliminary Soil
Remediation Goals. Background for surface water and sediment will be determined by the sample
results from Ravines 5 and 6.
COMPREHENSIVE DATA EVALUATION
Following completion of the investigation, EnSafe will update the ISR report and will develop an
investigation summary report, which will include summary tables, figures, laboratory reports, etc.,
and will present a summary of findings.
REFERENCES
EnSafe Inc. Initial Site Review Report. 5724 Summer Trees Drive, Memphis, Tennessee.
June 2020.
— Investigation Summary Report. 313 Wingo Way, Mount Pleasant, South Carolina.
July 2015.
North Carolina Department of Environmental and Natural Resources, Division of Water Quality.
Well Construction Standards. October 2009.
— Classifications and Water Quality Standards Applicable to the Groundwaters of
North Carolina. April 2013.
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Sampling and Analysis Plan — Raffinate Pond Release
American Zinc Products; Mooresboro, North Carolina
August 9, 2021
Page 10
Omernik, J., &Griffith, G. Ecoregions of North Carolina and South Carolina(EPA). 2008. Retrieved
from http://www.eoearth.org/view/article/152148
S&ME, Inc. Subsurface Exploration, Horsehead Corporation, Reid Property. 301 Zima Park Drive,
Spartanburg, South Carolina. July 2011.
— Subsurface Exploration — Addendum 1, Reid Property. 281 Fairforest Way,
Greenville, South Carolina. December 2011.
— Geotechnical Exploration Report, Horsehead Facility— Retaining Wall at Railyard.
301 Zima Park Drive, Spartanburg, South Carolina. July 2012.
United States Environmental Protection Agency Region 4, Science and Ecosystem Support Division.
Field Branches Quality System and Technical Procedures. 2013. Retrieved from:
http://www.epa.gov/region4/sesd/fbqstp/index.html
United States Geological Survey. Chesnee quadrangle, North Carolina[map]. Photo revised 2014.
1:24,000. 7.5 Minute Series. Reston, VA: United States Department of the Interior,
USGS, 2014.
Respectfully submitted,
EnSafe Inc.
By: Phillip . Coop, CHMM
Senior Project Manager
Attachments:
Figures
Figure 1A— Site Layout Map
Figure 1B — Interim Configuration for Raffinate and Depleted Solutions Ponds
Figure 2 — Historical Geotechnical Boring Location Map
Figure 3 — Initial Investigation Hand Auger Location Map
Figure 4 — Proposed Sub-liner Hand Auger Sampling Location Map
Figure 5 — Proposed Soil Boring and Monitoring Well Location Map
Figure 6 — Proposed Surface Sediment and Water Sampling Location Map
Tables
Table 1 — Background Soil Sample Summary
ENSA FE

Attachment
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MONITORING WELL LOCATIONS MAP
AMERICAN ZINC PRODUCTS
484 HICKS GROVE ROAD
MOORESBORO, NC 28114
3
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Attachment
Table 1 — Background Soil Sample Summary

Table 1
Background Soil Sample Summary
Horsehead Metal Products, Inc.
Mooresboro, North Carolina
Sample Location: SB-27 SB-28 SB-28 SB-29 SB-30
Sample Date: 05/08/2015 05/08/2015 05/08/2015 05/08/2015 05/08/2015
Sample Type: B FD B B B
Matrix: Soil Soil Soil Soil Soil
Sample Depth(inches bgs): 0-6 0-6 0-6 0-6 0-6
Analyte Units
Aluminum mg/kg 21000 22000 22000 20000 21000
Antimony mg/kg ND ND ND ND ND
Arsenic mg/kg 2.6 4 3.3 2.3 3.7
Barium mg/kg 110 51 52 74 37
Beryllium mg/kg 0.59 0.54 0.48 0.6 0.39
Cadmium mg/kg ND ND ND ND ND
Calcium mg/kg 1601 681 683 1803 603
Chromium,Total mg/kg 11 873 263 7.8 22
Cobalt mg/kg 3.1 8.61 8.83 2.2 8.8
Copper mg/kg 6.2 26 23 3.5 17
Iron mg/kg 9500 430001 220001 8400 26000
Lead mg/kg 15 17 15 13 18
Magnesium mg/kg 580 1700 1800 510 360
Manganese mg/kg 200 95 84 140 120
Nickel mg/kg 5.1 10 J 9.2 3.7 12
Potassium mg/kg 1800 2600 2400 570 720
Selenium mg/kg 0.861 1.5 11 0.633 11
Silver mg/kg ND ND ND ND ND
Sodium mg/kg ND ND ND ND ND
Thallium mg/kg ND ND ND ND ND
Vanadium mg/kg 18 66 45 15 40
Zinc mg/kg 24 47 45 22 16
Mercury mg/kg 0.024 J 0.026 J 0.027 J 0.0141 0.0069 J
Notes:
B = background sample
FD =field duplicate sample
bgs = below ground surface
mg/kg = milligrams per kilogram
ND =analyte not detected above method detection limit
J =estimated concentration

Maintenance Pond Sampling Memo 2021
MSAFE
creative thinking. custom solutions.°
Technical Memorandum
To: Charles Howell — Environmental Manager —American Zinc Products
Timothy Basilone —Vice President Environmental Affairs — American Zinc Recycling
From: EnSafe
Re: American Zinc Products (AZP) — Mooresboro, NC — Maintenance Pond Sampling
Date: September 13, 2021
Maintenance Pond Sub-Liner Hand Auger Sampling
On September 8, 2021 EnSafe mobilized to site to advance two hand auger locations below the
liner within the Maintenance Pond. A map of the Maintenance Pond sampling locations can be
found below. Location HA8 was advanced in the southeastern portion of the pond near the pump
well. Below the liner system there was a layer of sand/gravel approximately 24-inches thick. The
sand/gravel layer was moist and had an acidic odor. A shovel was used to remove the sand/gravel
layer to expose the underlying soil. Prior to advancing the hand auger within the underlying soil it
was noted that liquid was seeping from the sand/gravel layer at about 18-inches below the liner.
The liquid contained a brown organic layer which floated on top. A sample was collected, and the
pH was measured onsite at 1.33 standard units. The boring was terminated due to the liquid
accumulation within the hole. A sample of the sand/gravel bedding material was collected.
The second location (HA9) was advanced in the northwest corner of the pond. The sand/gravel
layer was approximately 22-inches thick, had a slight acidic odor but contained no free liquids. A
hand auger was used to advance the boring below the sand/gravel layer. Soils consisted of dry
silty clay with frequent gravel pieces. The hand auger was advanced to approximately 1-foot below
the sand/gravel layer where refusal was met due to large gravel pieces. Three samples were
collected at this location: the bedding material, the 0-to-0.5-foot interval, and the 0.5-to-1.0-foot
interval.
All samples were submitted to Waypoint Analytical Laboratory (Charlotte, NC) for analysis of the 8
RCRA Metals, Zinc, pH (soil only), and Total Organic Carbon (TOC). Results are pending.
1

Maintenance Pond Sampling Memo 2021
Sample locations were filled in with the material that was removed, and contractors patched the
holes cut in the liners.
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74
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