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Home My WebLink AboutAppendix F - Technical Memorandum - Water Quality TestingPiedmont Lithium Carolinas, Inc. I North Carolina Mining Permit Application Appendices PIEDMONT LITHIUM Appendix F: Technical Memorandum — Water Quality Testing n u Technical Memorandum Water Quality Testing Piedmont Lithium Gaston County, North Carolina March 19, 2020 Piedmont Lithium I Technical Memorandum — Water Quality Testing �� Contents Contents 1 Introduction............................................................................................................................1 2 Methods.................................................................................................................................1 2.1 Groundwater...................................................................................................................1 2.1.1 Groundwater Flow...................................................................................................3 2.1.2 Groundwater Sampling Procedures ........................................................................3 2.2 Surface Water.................................................................................................................3 2.2.1 Flow Measurements................................................................................................3 2.2.2 Surface Water Quality.............................................................................................4 3 Water Quality.........................................................................................................................4 3.1 Groundwater...................................................................................................................4 3.2 Surface Water.................................................................................................................4 4 Conclusions...........................................................................................................................5 4.1 Groundwater...............................................................................................................5 4.2 Surface Water.............................................................................................................5 Figure Figure 1 — Sample Location Map..................................................................................................2 Tables Table 1 - Monitoring Well Construction Summary and Groundwater Elevation Table 2 - Summary of Stream Flow Measurements Table 3 - Summary of Groundwater Quality Data Table 4 — Summary of Surface Water Quality Data Piedmont Lithium I Technical Memorandum — Water Quality Testing �� Introduction 1 Introduction HDR Engineering, Inc. of the Carolinas (HDR) has completed baseline groundwater and surface water monitoring at the planned Piedmont Lithium, Inc. (PLI) mine site (Site) between August 2018 and February 2020. Subsequent to installation of monitoring and observation wells in 2018, HDR conducted 17 groundwater gauging events, 12 groundwater sampling events, 2 surface water flow monitoring events, and 12 surface water sampling events. 2 Methods 2.1 Groundwater The groundwater monitoring network consists of five monitoring wells (MW-1 through MW-5), one aquifer test pumping well (PW-1), and four aquifer test observation wells (OW-1 S, OW-1 D, OW-2S, and OW-21D). Monitoring wells were installed in June and July 2018 to support monthly monitoring of groundwater levels and to provide baseline groundwater quality data prior to operation of the planned mine. The pumping and observation wells were installed in June and July 2018 to facilitate a planned 72-hour aquifer test for evaluation of hydrogeologic properties on the northeastern portion of the Site. Well construction details for the wells installed in 2018 are presented in Table 1 Well locations are shown on Figure 1. LEGEND o Pumping Well Monitoring Well 9 Observation Well 9 Surface Water Collection Sites o Stream Flow Measurements IP Project Boundary (963 ac.) © 0 Miles 0.25 •.1 :dl' i J# �.r sk .t� SAMPLE LOCATION MAP PIEDMONT PIEDMONT LITHIUM LITHIUM FIGURE 1 TECHNICAL MEMORANDUM: WATER QUALITY TESTING Piedmont Lithium I Technical Memorandum — Water Quality Testing �� Methods 2.1.1 Groundwater Flow Seventeen groundwater level gauging events were conducted from July 2018 to February 2020. Depth to water from the top of well casing was recorded using an electronic water level meter. Depths to water have ranged from 2.15 feet below top of casing (BTOC) in PW-1 (June 2019) to 55.62 feet BTOC in MW-3 (July 2018). Historic groundwater elevations are shown in Table 1. Based on the data, groundwater generally mimics topography and flows from southwest to northeast across the Site. 2.1.2 Groundwater Sampling Procedures Groundwater samples were collected by HDR during 12 sampling events between August 2018 and February 2020. Purging was conducted via low -flow methods and was considered complete when the water table and field parameters had stabilized in accordance with the targets specified below. Field measurements were obtained using a calibrated water quality meter. • Turbidity (10% for values greater than 5 NTU (if three turbidity values are less than 5 NTU, the values are considered stabilized) • DO (10% for values greater than 0.5 mg/L, if three DO values are less than 0.5 mg/L, the values are considered stabilized) • Specific conductance (3%) • Temperature (3%) • pH (± 0.1 unit) • ORP (± 10 millivolts) The water level meter and pump were decontaminated in the field with a distilled water rinse, Alconox® wash, and a distilled water rinse, prior to and following sampling at each monitoring well. Purge water was discharged to the ground surface adjacent to each well. Samples were transferred under Chain of Custody (COC) procedures to Pace Analytical Services, LLC (Pace) of Huntersville, North Carolina (NC Certification #37706) for analysis of constituents, as specified in Section 3.1. Sample handling and custody were performed according to the EPA Guidance for Field Samplers. 2.2 Surface Water 2.2.1 Flow Measurements Two surface water flow measurement events occurred during May and June 2019 at 15 locations around the Site (Figure 1). Six flow measurements were taken on larger streams (FM- 1 through FM-6) and nine flow measurements were taken on smaller tributaries (Weir-1 through Weir-9). Stream flow was measured using Swoffer Model 3000 Current Velocity Flowmeters in the larger streams and the float method in the smaller tributaries. The Swoffer uses a propeller driven rotor that produces electronic pulses that are directly proportional to flow velocity. Flow measurements ranged from 24.15 cubic feet per second (cfs) in FM-1 to 0.065 cfs in Weir-1 (Table 2). Piedmont Lithium I Technical Memorandum — Water Quality Testing �� Water Quality 2.2.2 Surface Water Quality HDR established seven surface water sampling locations (SITE-1 through SITE-7) along Beaver Dam Creek and Little Beaver Dam Creek to evaluate surface water quality across the Site. Grab samples were collected from each surface water sampling location monthly from February 2019 to January 2020. Prior to sample collection, field parameters (including temperature, conductivity, pH, ORP, and DO) were measured with a water quality meter. Surface water sampling locations are shown on Figure 1. 3 Water Quality 3.1 Groundwater Groundwater samples were analyzed for the following suite of inorganic constituents: • Metals using USEPA Method 6010D • Alkalinity using Standard Method (SM) 2320B • Total dissolved solids (TDS) using SM 2540C • Total Kjeldahl nitrogen using USEPA Method 351.2 • Nitrate and nitrite using USEPA Method 353.2 • Total nitrogen (calculation) • Chloride, fluoride, sulfate using USEPA Method 300.0 • Cyanide using SM 4500-CN Following the initial August 2018 sampling event, the samples were analyzed for the RCRA 8 metals and the constituents listed above (Table 3). Concentrations of arsenic, chromium, lead, manganese and fluoride that exceeded the North Carolina Department of Environmental Quality (NCDEQ) groundwater quality standards (21- Standards) were reported in MW-2, MW-5, OW- 1 D, OW-2S, and PW-1. Additionally, pH field measurements were observed above and below the 2L Standard range of 6.5-8.5 standard units (SU) in each of the wells during the monitoring period. The pH was consistently above 8.5 SU in MW-1, MW-5 and PW-1. Note that the presence of naturally occurring metals above 2L Standards is common in the Piedmont Physiographic Provence of North Carolina and does not necessarily constitute groundwater contamination. 3.2 Surface Water Surface water samples collected were analyzed for the following: • Metals using USEPA Method 6010D • Alkalinity using Standard Method (SM) 2320B • Total dissolved solids (TDS) using SM 2540C • Total Kjeldahl nitrogen using USEPA Method 351.2 • Nitrate and nitrite using USEPA Method 353.2 Piedmont Lithium I Technical Memorandum — Water Quality Testing �� Conclusions • Total nitrogen (calculation) • Chloride, fluoride, sulfate using USEPA Method 300.0 • Cyanide using SM 4500-CN • Ammonia using USEPA Method 350.1 • Chlorophyll -A using SM 10200-H • Total suspended solids using SM 2540D • Phosphorus using USEPA Method 365.1 Six of the twelve surface water sampling events were collected during ambient conditions and six were collected during non -ambient conditions. Non -ambient conditions are considered when precipitation in the area is greater than 0.1 inch in the 72 hours prior to sampling. Precipitation amounts were monitored using the Community Collaborative Rain, Hail, and Snow (CoCoRaHS) Network. Samples collected were compared to the 15A NCAC 02B Standards and no exceedances were observed during the sampling events. A summary of the surface water quality data is presented in Table 4. 4 Conclusions 4.1 Groundwater The results of monthly groundwater level gauging indicate typical seasonal fluctuations of water levels across the Site. Further, groundwater elevations mimic topography, which is consistent with the regolith-fractured crystalline rock aquifer system of the Piedmont Physiographic Province of North Carolina. Concentrations of naturally -occurring inorganic constituents were detected in each monitoring well within the sampling network. The number of constituents detected and the magnitude of concentrations detected in the samples collected from MW-5 exceeded observations in other wells sampled and this condition is likely due to natural variability or other conditions (e.g. anthropogenic source). 4.2 Surface Water Surface water flow measurements were used to develop a 3-Dimensional flow model to establish baseline flow across the Site prior to mine operations. There were neither organic nor inorganic exceedances in the surface water samples collected from Beaver Dam Creek and Little Beaver Dam Creek. Piedmont Lithium I Technical Memorandum — Water Quality Testing �� Tables Tables TABLE 1 SUMMARY OF MONITORING WELL CONSTRUCTION AND GROUNDWATER ELEVATION DATA PIEDMONT LITHIUM, INC. GASTON COUNTY, NORTH CAROLINA Well ID Northing (feet) Easting (feet) Well Diameter (inches) Total Dpeth (ft bgs) Screened Interval (ft bgs) Top of Casing Elevation (feet) Date of Water Level Measurement DTW (ft bTOC) GW Elevation (ft msl) MW-1 605465.4409 1319945.982 6 110 Open Hole Interval (60-110) 762.49 7/16/2018 21.33 741.16 8/7/2018 19.73 742.76 10/4/2018 20.15 742.34 11/16/2018 17.56 744.93 12/21/2018 17.50 744.99 1/25/2019 18.11 744.38 2/27/2019 17.47 745.02 4/24/2019 18.02 744.47 6/24/2019 18.96 743.53 7/22/2019 19.45 743.04 8/20/2019 19.64 742.85 9/23/2019 20.04 742.45 10/28/2019 20.10 742.39 11/18/2019 20.11 742.38 12/17/2019 19.68 742.81 1/27/2020 19.35 743.14 2/25/2020 18.48 744.01 MW-2 605494.2222 1316921.051 6 110 Open Hole Interval (60-110) 864.12 7/16/2018 47.99 816.13 8/7/2018 47.88 816.24 10/4/2018 47.37 816.75 11/16/2018 47.02 817.10 12/21/2018 46.25 817.87 1/25/2019 45.29 818.83 2/27/2019 44.03 820.09 4/24/2019 41.85 822.27 6/24/2019 40.44 823.68 7/22/2019 40.19 823.93 8/20/2019 40.10 824.02 9/23/2019 42.03 822.09 10/28/2019 40.84 823.28 11/18/2019 41.01 823.11 12/17/2019 41.22 822.90 1/27/2020 41.30 822.82 2/25/2020 40.80 823.32 MW-3 603244.8572 1315463.542 6 170 Open Hole Interval (117-170) 840.39 7/16/2018 55.62 784.77 8/7/2018 55.13 785.26 10/4/2018 54.96 785.43 11/16/2018 54.30 786.09 12/21/2018 52.95 787.44 1/25/2019 51.02 789.37 2/27/2019 49.22 791.17 4/24/2019 46.70 793.69 6/24/2019 46.58 793.81 7/22/2019 47.16 793.23 8/20/2019 47.91 792.48 9/23/2019 48.69 791.70 10/28/2019 49.75 790.64 11/18/2019 50.09 790.30 12/17/2019 50.46 789.93 1/27/2020 50.41 789.98 2/25/2020 49.08 791.31 MW-4 601127.1718 1319231.618 6 153 Open Hole Interval (102-153) 884.97 7/16/2018 40.72 844.25 8/7/2018 40.46 844.51 10/4/2018 39.40 845.57 11/16/2018 38.05 846.92 12/21/2018 36.08 848.89 1/25/2019 34.59 850.38 2/27/2019 33.18 851.79 4/24/2019 32.39 852.58 6/24/2019 33.05 851.92 7/22/2019 33.65 851.32 8/20/2019 34.39 850.58 9/23/2019 35.07 849.90 10/28/2019 36.09 848.88 11/18/2019 36.44 848.53 12/17/2019 36.50 848.47 1/27/2020 35.30 849.67 2/25/2020 33.83 851.14 TABLE 2 SUMMARY OF STREAM FLOW MEASUREMENTS PIEDMONT LITHIUM, INC. GASTON, NORTH CAROLINA Location ID Date Flow (cfs) Flow (gpm) FM-1 5/13/2019 24.15 10839.2 6/11/2019 20.40 9156.1 FM-2 5/13/2019 20.95 9403.0 6/11/2019 20.60 9245.9 FM-3 5/13/2019 8.00 3590.6 6/11/2019 8.40 3770.2 FM-4 5/13/2019 12.15 5453.3 6/11/2019 12.05 5408.4 FM-5 5/15/2019 0.35 157.1 6/12/2019 0.30 134.6 FM-6 5/15/2019 9.05 4061.9 6/12/2019 8.65 3882.4 Weir-1 5/15/2019 0.065 29.2 6/12/2019 0.34 152.9 Weir-2 5/15/2019 0.60 269.3 6/13/2019 0.53 238.3 Weir-3 5/15/2019 NM >11* 6/12/2019 0.088 39.7 Weir-4 5/15/2019 0.42 188.5 6/13/2019 0.15 68.0 Weir-5 5/15/2019 0.25 112.2 6/13/2019 0.15 66.1 Weir-6 5/15/2019 0.82 365.8 6/13/2019 0.37 166.1 Weir-7 5/15/2019 0.10 44.9 6/12/2019 0.097 43.6 Weir-8 5/15/2019 0.03 13.5 6/13/2019 0.04 18.9 Weir-9 5/15/2019 0.07 31.4 6/13/2019 0.10 45.2 Notes: cfs - cubic feet per second gpm - gallons per minute NM - not measured * A temporary weir was used at this location TABLE 3 SUMMARY OF GROUNDWATER QUALITY DATA PIEDMONT LITHIUM, INC. GASTON COUNTY, NORTH CAROLINA Field Measurements Alkalinity Nitrogen Location Date Turbidity (NTU) DO (mg/L) pH (SU) Specific Conductivity (Ps/cm) Temperature (°C) Arsenic (ug/L) Barium (ug/L) Cadmium (ug/L) Chromium (ug/L) Lead (ug/L) Lithium (ug/L) Mercury (ug/L) Manganese (ug/L) Selenium (ug/L) Silver (ug/L) Bicarbonate ( (mg L) Carbonate ( (mg L) Total (mg L) Total �mgg) Total Keldahl Nitrogen Nitrogen, N (mg/L) Total Dissolved Solids (mg/L) Chloride (mg/L) Fluoride (mg/L) Sulfate (mg/L) Cyanide (mg/L) 8/10/2018 4.91 5.97 11.73 675.0 17.0 <10.0 16.6 <1.0 6.1 <5.0 NS NS NS <10.0 <5.0 <5.0 140 160 <0.52 <0.50 0.17 233 3.3 0.32 12.9 <0.0080 3/27/2019 NM NM NM NM NM <10.0 19.1 <1.0 <5.0 <5.0 84.2 NS <5.0 <10.0 <5.0 <5.0 88.0 168 <0.52 <0.50 0.25 224 2.0 0.18 7.3 <0.0080 4/24/2019 1.27 3.36 11.75 737.0 16.6 <10.0 18.7 <1.0 <5.0 <5.0 78.2 <0.20 <5.0 <10.0 <5.0 <5.0 51.0 178 0.87 0.62 0.25 256 1.9 0.18 6.8 <0.0080 6/24/2019 1.66 4.63 11.46 636.0 17.1 <10.0 19.50 <1.0 <5.0 <5.0 73.0 <0.20 <5.0 <10.0 <5.0 <5.0 58.70 161.00 <0.52 <0.50 0.27 212.00 2.00 0.16 6.90 <0.0080 7/22/2019 1.45 4.78 11.68 624.0 16.8 <10.0 17.0 <1.0 <5.0 <5.0 71.4 NS <5.0 <10.0 <5.0 <5.0 67.7 146 <0.52 <0.50 0.27 181 2.0 0.17 6.7 <0.0080 8/23/2019 20.4 3.85 11.39 634.0 17.8 <10.0 20.1 <1.0 <5.0 <5.0 81.8 <0.20 14.1 <10.0 <5.0 <5.0 71.3 154 0.58 <0.50 0.29 195 2.2 0.27 7.5 <0.0080 MW-1 9/24/2019 1.5 3.71 11.26 581.4 16.6 <10.0 16.8 <1.0 <5.0 <5.0 80.3 <0.20 <5.0 <10.0 <5.0 <5.0 80.3 153 <0.52 <0.50 0.30 186 2.1 0.17 6.6 <0.0080 10/28/2019 2.06 4.21 11.56 597.7 15.1 <10.0 15.4 <1.0 <5.0 <5.0 81.2 <0.20 <5.0 <10.0 <5.0 <5.0 40.1 141 0.52 <0.50 0.31 214 1.9 0.26 7.2 <0.0080 11/18/2019 1.01 4.19 11.54 450.7 14.7 <50.0' 13.1 <5.0* <25.0' <25.0` 91.6 <0.20 <25.0* <50.0 <25.0* <5.0 64.9 108 0.60 <0.50 0.40 142 2.0 0.20 5.2 <0.0080 12/17/2019 0.40 5.02 10.41 124.6 15.0 <10.0 7.2 <1.0 <5.0 <5.0 97.1 <0.20 <5.0 <10.0 <5.0 <5.0 39.3 40.6 0.53 <0.50 0.46 71.0 2.0 0.11 2.9 <0.0080 1/27/2020 0.60 5.58 10.44 140.4 14.7 <10.0 9.1 <1.0 <5.0 <5.0 97.0 <0.20 5.0 <10.0 <5.0 16.5 19.3 35.8 0.69 <0.50 0.51 76.0 2.0 <0.10 2.2 <0.0080 2/25/2020 1.47 2.56 11.57 500.7 14.7 <10.0 9.1 <1.0 <5.0 <5.0 76.6 <0.20 <5.0 <10.0 <5.0 <5.0 64.6 120 <0.52 <0.50 0.33 140 2.2 0.36 7.1 <0.0080 8/9/2018 8.20 0.95 7.80 184.6 17.5 <10.0 <5.0 <1.0 <5.0 <5.0 NS NS NS <10.0 <5.0 79.1 <5.0 79.1 1.30 <0.50 0.91 135 2.5 <0.10 8.2 <0.0080 3/27/2019 NM NM NM NM NM <10.0 1 <5.0 <1.0 <5.0 <5.0 1 180.0 NS 33.6 <10.0 <5.0 1 95.4 <5.0 95.4 1.40 <0.50 1.10 139 2.3 <0.10 5.4 <0.0080 4/24/2019 4.79 0.15 7.98 203.9 16.6 <10.0 <5.0 <1.0 <5.0 <5.0 167 <0.20 31.1 <10.0 <5.0 97.3 <5.0 97.3 1.4 <0.50 1 1.1 165 2.3 <0.10 5.3 <0.0080 6/24/2019 1.24 1.61 7.37 184.2 18.6 <10.0 <5.0 <1.0 12.80 <5.0 99.3 <0.20 21.4 <10.0 <5.0 86.50 <5.0 86.50 1.90 <0.50 1.70 145.00 2.50 <0.10 3.30 <0.0080 7/22/2019 1.09 0.31 8.10 203.0 16.7 <10.0 <5.0 <1.0 <5.0 <5.0 129 NS 21.7 <10.0 <5.0 98.2 <5.0 98.2 1.3 <0.50 1.2 133 2.4 <0.10 4.9 <0.0080 MW-2 8/22/2019 2.79 0.29 7.58 214.0 16.8 <10.0 <5.0 <1.0 11.4 <5.0 145 <0.20 19.4 <10.0 <5.0 106 <5.0 106 1.4 <0.50 1.3 163 2.6 <0.10 5.7 <0.0080 9/24/2019 0.64 4.18 5.87 138.2 15.9 <10.0 5.2 <1.0 1 <5.0 <5.0 70.4 <0.20 17.6 1 <10.0 <5.0 57.1 <5.0 57.1 2.0 <0.50 2.0 103 2.5 <0.10 1.5 <0.0080 10/28/2019 0.63 6.30 7.07 189.7 16.4 <10.0 1 <5.0 <1.0 <5.0 <5.0 93.6 1 <0.20 21.4 <10.0 <5.0 1 79.0 <5.0 1 79.0 2.2 <0.50 2.0 1 146 2.4 <0.10 3.1 <0.0080 11/18/2019 0.46 4.02 1 6.75 147.0 15.9 <10.0 <5.0 <1.0 <5.0 <5.0 82.9 <0.20 12.7 <10.0 <5.0 57.2 <5.0 57.2 2.3 <0.50 2.1 113 2.6 <0.10 1.9 <0.0080 12/17/2019 0.63 5.69 6.30 112.8 16.0 <10.0 6.8 <1.0 <5.0 <5.0 72.0 <0.20 12.6 <10.0 <5.0 44.0 <5.0 44.0 2.3 <0.50 2.2 74.0 2.6 <0.10 1.1 <0.0080 1/28/2020 1.72 0.85 7.75 213.2 15.5 <10.0 <5.0 <1.0 <5.0 <5.0 141 <0.20 19.2 <10.0 <5.0 106 <5.0 106 1.6 <0.50 1.5 129 2.4 <0.10 4.8 <0.0080 2/25/2020 0.32 3.24 7.00 171.3 15.4 <10.0 <5.0 <1.0 <5.0 <5.0 82.8 <0.20 17.8 <10.0 <5.0 74.1 <5.0 74.1 2.0 <0.50 1.9 98.0 2.6 <0.10 2.5 1 <0.0080 8/9/2018 8.70 5.59 9.06 106.9 17.7 <10.0 <5.0 <1.0 1 <5.0 <5.0 NS NS NS <10.0 <5.0 46.1 <5.0 46.1 0.88 <0.50 0.65 94.0 1.3 1 <0.10 2.9 <0.0080 3/27/2019 NM NM NM NM NM <10.0 <5.0 <1.0 <5.0 <5.0 185.0 1 NS 12.5 <10.0 <5.0 1 47.9 <5.0 1 47.9 0.90 <0.50 0.76 85.0 1.3 <0.10 1.5 <0.0080 4/24/2019 3.21 6.39 1 8.77 102.0 16.1 <10.0 5.2 <1.0 <5.0 <5.0 185 <0.20 5.5 <10.0 <5.0 46.4 <5.0 48.2 0.99 <0.50 0.70 112 1.3 <0.10 1.6 <0.0080 6/24/2019 1.60 5.35 8.97 103.4 18.1 <10.0 9.70 <1.0 <5.0 <5.0 172 <0.20 <5.0 <10.0 <5.0 45.20 <5.0 48.90 0.89 <0.50 0.72 84.00 1.30 <0.10 1.60 <0.0080 7/23/2019 1.43 6.14 7.86 97.1 18.1 <10.0 <5.0 <1.0 <5.0 <5.0 155 NS 6.0 <10.0 <5.0 43.6 <5.0 43.6 0.9 <0.50 0.72 50.0 1.4 <0.50 1.5 <0.0080 8/23/2019 1.08 5.98 7.66 101.8 16.5 <10.0 <5.0 <1.0 <5.0 <5.0 184 <0.20 <5.0 <10.0 <5.0 48.8 <5.0 48.8 0.90 <0.50 0.72 83.0 1.5 <0.10 2.1 <0.0080 MW-3 9/23/2019 1.75 6.87 6.86 96.6 16.5 <10.0 <5.0 <1.0 1 <5.0 <5.0 179 <0.20 <5.0 1 <10.0 <5.0 47.5 <5.0 47.5 0.86 1 <0.50 0.82 83.0 1.5 <0.10 1.5 <0.0080 10/28/2019 1.44 7.10 8.03 105.1 16.4 <10.0 <5.0 <1.0 <5.0 <5.0 186 1 <0.20 <5.0 <10.0 <5.0 1 46.0 <5.0 46.0 0.96 <0.50 0.82 98.0 1.3 <0.10 1.4 <0.0080 11/20/2019 0.90 5.71 1 7.77 104.4 14.5 <10.0 <5.0 <1.0 <5.0 <5.0 204 <0.20 5.6 <10.0 <5.0 45.0 <5.0 45.0 1.00 <0.50 0.87 1 87.0 1.5 <0.10 1.5 <0.0080 12/17/2019 2.74 5.28 8.35 111.4 15.6 <10.0 <5.0 <1.0 <5.0 <5.0 194 <0.20 <5.0 <10.0 <5.0 53.5 <5.0 53.5 0.81 <0.50 0.81 82.0 1.5 <0.10 1.5 <0.0080 1/27/2020 3.01 6.79 7.86 102.1 14.6 <10.0 <5.0 <1.0 <5.0 <5.0 199 <0.20 <5.0 <10.0 <5.0 50.4 <5.0 50.4 1.0 <0.50 0.81 78.0 1.4 <0.10 1 1.4 <0.0080 2/27/2020 4.69 5.81 8.20 108.8 15.4 <10.0 <5.0 <1.0 <5.0 <5.0 186 <0.20 <5.0 <10.0 <5.0 53.6 <5.0 53.6 0.78 <0.50 0.75 65.0 1.5 <0.10 1.4 <0.0080 8/7/2018 13.10 7.11 9.20 120.5 18.4 <10.0 5.2 <1.0 25.7 <5.0 NS NS NS <10.0 <5.0 44.2 <5.0 49.1 1.2 <0.50 1.10 93.0 1.0 1.1 4.1 <0.0080 3/27/2019 NM NM NM NM NM <10.0 5.4 <1.0 <5.0 <5.0 222 NS 23.4 <10.0 <5.0 39.6 11.7 51.3 1.4 <0.50 1.2 93.0 <1.0 <0.10 1.3 <0.0080 4/25/2019 2.23 6.15 9.08 113.0 16.5 <10.0 <5.0 <1.0 <5.0 <5.0 228 <0.20 11.9 <10.0 <5.0 40.3 15.0 55.2 1.6 <0.50 1.2 127 <1.0 <0.10 1.1 <0.0080 6/25/2019 1.61 5.75 8.52 105.4 17.5 <10.0 5.50 <1.0 <5.0 <5.0 190 <0.20 11.2 <10.0 <5.0 49.70 <5.0 49.70 1.30 <0.50 1.20 105.00 <1.0 <0.10 1.00 <0.0080 7/24/2019 1.22 5.64 8.25 98.2 18.8 <10.0 5.5 <1.0 <5.0 <5.0 159 NS 16.2 <10.0 <5.0 46.1 <5.0 46.1 1.4 <0.50 1.1 58.0 1.0 <0.10 1.0 <0.0080 MW-4 8/23/2019 2.48 6.61 7.57 98.3 17.5 <10.0 6.4 <1.0 <5.0 <5.0 172 <0.20 12.0 <10.0 1 <5.0 46.1 <5.0 1 46.1 1.3 <0.50 1.1 86.0 <1.0 I <0.10 1.3 1 <0.0080 9/24/2019 3.03 6.36 6.99 93.4 16.4 <10.0 5.3 <1.0 <5.0 <5.0 161 <0.20 19.6 <10.0 <5.0 46.2 <5.0 46.2 1.2 <0.50 1.1 89.0 <1.0 <0.10 <1.0 <0.0080 10/30/2019 0.87 7.57 7.58 96.7 16.5 <10.0 1 5.6 <1.0 <5.0 <5.0 163 1 <0.20 10 <10.0 <5.0 41.4 <5.0 41.4 1.4 1 <0.50 1.2 1 79.0 <1.0 <0.10 <1.0 <0.0080 11/19/2019 1.74 6.08 1 7.82 103.2 15.7 <10.0 <5.0 <1.0 <5.0 <5.0 187 <0.20 17.4 <10.0 <5.0 44.0 <5.0 44.0 1.3 0 1.2 94.0 <1.0 <0.10 1.2 <0.0080 12/19/2019 1.81 5.98 7.16 91.5 14.6 <10.0 <5.0 <1.0 23.2 <5.0 158 <0.20 8.5 <10.0 <5.0 41.0 <5.0 41.0 1.3 0 1.2 83.0 <1.0 <0.10 <1.0 <0.0080 1/29/2020 0.58 7.29 7.55 91.3 15.6 <10.0 8.8 <1.0 <5.0 <5.0 155 <0.20 <5.0 <10.0 <5.0 43.6 <5.0 43.6 1.3 0 E10 1.2 68.0 <1.0 <0.10 <1.0 <0.0080 2/27/2020 1.90 6.18 7.12 91.9 16.6 <10.0 6.8 <1.0 <5.0 <5.0 145 <0.20 5.9 <10.0 <5.0 41.4 <5.0 41.4 1.2 0 1.1 55.0 <1.0 <0.10 <1.0 <0.0080 TABLE 3 SUMMARY OF GROUNDWATER QUALITY DATA PIEDMONT LITHIUM, INC. GASTON COUNTY, NORTH CAROLINA Field Measurements Alkalinity Nitrogen Location Date Turbidity (NTU) DO (mg/L) pH (SU) Specific Conductivity (Ps/cm) Temperature (°C) Arsenic (ug/L) Barium (ug/L) Cadmium (ug/L) Chromium (ug/L) Lead (ug/L) Lithium (ug/L) Mercury (ug/L) Manganese (ug/L) Selenium (ug/L) Silver (ug/L) Bicarbonate ((mg L) Carbonate ((mg L) Total (mg L) Total �mgg) Total Keldahl Nitrogen Nitrogen, N (mg/L) Total Dissolved Solids (mg/L) Chloride (mg/L) Fluoride (mg/L) Sulfate (mg/L) Cyanide (mg/L) 8/8/2018 14.7 4.04 11.97 169.7 20.4 221 485 1.3 328 39.9 NS NS NS 26.7 <5.0 1530 1800 3330 <0.52 <0.50 0.081 520 2.4 0.28 19.4 <0.0080 3/27/2019 NM NM NM NM NM <10.0 14.6 <1.0 6.2 <5.0 70.9 NS <5.0 <10.0 <5.0 <5.0 88.0 193 <0.52 <0.50 <0.040 271 1.8 0.15 13.5 <0.0080 4/25/2019 2.93 3.11 11.19 276.4 19.3 <10.0 12.9 <1.0 <5.0 <5.0 151 <0.20 <5.0 <10.0 <5.0 <5.0 35.8 70.0 <0.52 <0.50 0.091 108 <1.0 <0.10 2.1 <0.0080 6/25/2019 4.39 5.83 10.99 228.0 18.1 10.40 13.60 <1.0 <5.0 <5.0 147 <0.20 <5.0 <10.0 <5.0 12.30 86.30 98.60 <0.52 <0.50 0.089 80.00 <1.0 0.10 2.00 <0.0080 7/24/2019 3.22 3.22 10.97 183.7 18.2 <10.0 9.7 <1.0 <5.0 <5.0 130 NS <5.0 <10.0 <5.0 <5.0 48.9 54.0 <0.52 <0.50 0.088 56.0 <1.0 <0.10 1.9 <0.0080 MW-5 8/21/2019 6.18 2.75 10.72 185.5 20.5 <10.0 9.7 <1.0 <5.0 <5.0 143 <0.20 6.0 <10.0 <5.0 <5.0 47.0 50.3 <0.52 <0.50 0.077 74.0 1.2 0.13 3.5 <0.0080 9/24/2019 17.40 6.81 10.73 184.3 18.5 <10.0 9.6 <1.0 <5.0 <5.0 146 <0.20 8.2 <10.0 <5.0 17.1 54.0 71.2 <0.52 <0.50 0.087 79.0 1.1 <0.10 3.0 <0.0080 10/29/2019 4.47 3.40 10.71 141.4 17.5 <10.0 8.2 <1.0 1 <5.0 <5.0 158 <0.20 1 <5.0 <10.0 <5.0 <5.0 24.4 40.1 <0.52 <0.50 0.087 63.0 <1.0 <0.10 2.0 <0.0080 11/20/2019 8.23 0.23 11.58 515.5 16.9 <10.0 6.7 <1.0 <5.0 <5.0 80.1 <0.20 <5.0 <10.0 <5.0 <5.0 62.5 125 <0.52 <0.50 <0.040 168 1.6 0.20 1 10.4 <0.0080 12/18/2019 7.19 2.71 10.08 88.9 15.0 14.3 8.2 <1.0 <5.0 <5.0 169 <0.20 7.5 <10.0 <5.0 42.5 11.9 54.4 <0.52 <0.50 0.078 44.0 1.1 0.10 2.3 <0.0080 1/28/2020 4.77 2.85 10.86 169.1 15.6 <10.0 9.6 <1.0 <5.0 <5.0 158 <0.20 7.2 <10.0 <5.0 <5.0 48.1 50.3 <0.52 <0.50 0.068 64.0 1.1 <0.10 2.9 <0.0080 2/26/2020 3.58 5.65 9.66 82.9 15.1 13.9 <5.0 <1.0 <5.0 <5.0 156 <0.20 <5.0 <10.0 <5.0 30.1 6.7 36.9 <0.52 <0.50 0.069 44.0 1.1 <0.10 2.8 <0.0080 8/9/2018 12.3 6.70 6.78 124.6 15.9 <10.0 <5.0 <1.0 <5.0 <5.0 NS NS NS <10.0 <5.0 64.5 <5.0 64.5 <0.52 <0.50 0.16 103 <1.0 <0.10 <1.0 <0.0080 3/27/2019 NM NM NM NM NM <10.0 <5.0 1 <1.0 <5.0 <5.0 108 NS 12.8 <10.0 <5.0 69.6 <5.0 69.6 <0.52 <0.50 0.19 103 <1.0 <0.10 <1.0 <0.0080 4/26/2019 5.71 6.40 6.92 127.9 14.9 <10.0 <5.0 <1.0 <5.0 <5.0 109 <0.20 34.9 <10.0 <5.0 73.2 <5.0 73.2 <0.52 <0.50 0.17 157 <1.0 <0.10 I <1.0 <0.0080 6/26/2019 9.63 5.52 7.01 128.4 15.7 <10.0 <5.0 <1.0 <5.0 <5.0 97.8 <0.20 14.9 <10.0 <5.0 69.60 <5.0 69.60 <0.52 <0.50 0.22 104.00 <1.0 <0.10 <1.0 <0.0080 7/23/2019 5.15 6.37 6.92 122.4 15.9 <10.0 <5.0 <1.0 <5.0 <5.0 85.8 NS 23.2 <10.0 <5.0 64.8 <5.0 64.8 <0.52 <0.50 0.16 104 <1.0 <0.10 <1.0 1 <0.0080 ow 8/22/2019 8.49 5.10 6.77 126.6 17.3 <10.0 <5.0 <1.0 <5.0 <5.0 98.0 <0.20 1 30.8 <10.0 <5.0 69.5 <5.0 69.5 <0.52 <0.50 0.16 100 <1.0 0.12 <1.0 <0.0080 -is 9/26/2019 9.73 6.32 6.06 119.0 16.2 <10.0 <5.0 <1.0 1 <5.0 <5.0 95.5 <0.20 32.0 <10.0 <5.0 68.3 <5.0 68.3 <0.52 <0.50 0.16 100 1.1 <0.10 <1.0 <0.0080 10/30/2019 7.24 6.77 6.92 125.0 15.6 <10.0 <5.0 <1.0 <5.0 <5.0 103 <0.20 19.1 <10.0 <5.0 62.7 <5.0 62.7 <0.52 <0.50 0.17 106 <1.0 <0.10 <1.0 <0.0080 11/21/2019 2.06 6.00 6.84 127.6 15.2 <10.0 <5.0 <1.0 <5.0 <5.0 106 <0.20 <5.0 <10.0 <5.0 63.6 <5.0 63.6 <0.52 <0.50 0.19 1 109 <1.0 <0.10 <1.0 <0.0080 12/19/2019 9.98 5.30 6.85 125.6 13.8 <10.0 <5.0 <1.0 <5.0 <5.0 105 <0.20 31.4 <10.0 <5.0 67.4 <5.0 67.4 <0.52 <0.50 0.17 115 <1.0 <0.10 <1.0 <0.0080 1/28/2020 12.80 6.40 6.80 120.1 13.9 <10.0 <5.0 <1.0 <5.0 <5.0 112 1 0.33 23.0 <10.0 <5.0 65.2 <5.0 65.2 <0.52 <0.50 0.16 93.0 <1.0 <0.10 I <1.0 <0.0080 2/26/2020 4.29 6.75 6.69 133.4 13.8 <10.0 <5.0 <1.0 <5.0 <5.0 98.4 <0.20 5.9 <10.0 <5.0 71.9 <5.0 71.9 <0.52 <0.50 0.16 75.0 <1.0 <0.10 <1.0 <0.0080 8/7/2018 13.20 5.94 7.21 187.7 17.6 <10.0 5.5 <1.0 1 6.9 <5.0 NS NS NS <10.0 1 <5.0 93.8 <5.0 93.8 <0.52 1 <0.50 0.26 132 1.7 0.16 1.2 <0.0080 3/27/2019 NM NM NM NM NM <10.0 <5.0 <1.0 <5.0 <5.0 184 NS 63.9 <10.0 <5.0 100 <5.0 100 <0.52 <0.50 0.31 137 1.6 0.12 1.1 <0.0080 4/26/2019 1.17 4.93 6.85 165.4 14.4 <10.0 <5.0 <1.0 <5.0 <5.0 161 <0.20 <5.0 <10.0 <5.0 92.6 <5.0 92.6 1.0 0.75 0.27 1 155 1.5 <0.10 <1.0 <0.0080 6/26/2019 3.69 4.08 6.93 181.3 16.4 <10.0 <5.0 <1.0 <5.0 <5.0 163 <0.20 49.3 <10.0 <5.0 100.00 <5.0 100.00 <0.52 <0.50 0.29 117.00 1.60 <0.10 1.00 <0.0080 7/23/2019 6.37 4.58 6.93 176.8 16.8 <10.0 <5.0 <1.0 <5.0 <5.0 145 1 NS 50.1 <10.0 <5.0 93.6 <5.0 93.6 <0.52 <0.50 0.27 101 1.7 <0.10 1 1.0 <0.0080 8/22/2019 2.68 4.48 6.84 172.3 16.2 <10.0 <5.0 <1.0 <5.0 <5.0 154 <0.20 6.9 <10.0 <5.0 90.4 <5.0 90.4 <0.52 <0.50 0.27 122 1.9 <0.10 1.0 <0.0080 OW-1 D 9/25/2019 4.36 4.22 6.19 167.5 15.9 <10.0 1 <5.0 <1.0 1 <5.0 <5.0 158 <0.20 22.0 1 <10.0 <5.0 94.7 <5.0 94.7 <0.52 1 <0.50 0.31 130 1.8 <0.10 <1.0 <0.0080 10/30/2019 5.69 5.34 6.93 171.6 15.6 <10.0 <5.0 <1.0 <5.0 <5.0 166 <0.20 8.0 <10.0 <5.0 87.2 <5.0 1 87.2 <0.52 <0.50 0.30 120 1.7 <0.10 <1.0 <0.0080 11/21/2019 2.18 2.98 6.95 180.1 15.4 <10.0 <5.0 <1.0 <5.0 5.5 163 <0.20 5.1 <10.0 <5.0 94.2 <5.0 94.2 <0.52 <0.50 0.30 1 132 1.7 <0.10 <1.0 1 <0.0080 12/19/2019 2.31 4.50 6.87 172.3 14.2 <10.0 <5.0 <1.0 <5.0 <5.0 172 <0.20 9.7 <10.0 <5.0 92.3 <5.0 92.3 <0.52 <0.50 0.30 130 1.8 <0.10 <1.0 <0.0080 1/29/2020 13.0 4.43 7.03 162.9 12.0 <10.0 <5.0 <1.0 <5.0 30.1 1 162 <0.20 6.2 <10.0 <5.0 90.7 <5.0 90.7 <0.52 <0.50 0.27 92.0 1.6 <0.10 <1.0 <0.0080 2/27/2020 8.10 4.12 6.75 170.1 12.7 <10.0 <5.0 <1.0 <5.0 22.5 152 <0.20 5.6 <10.0 <5.0 90.4 <5.0 90.4 <0.52 <0.50 0.29 101 1.8 <0.10 <1.0 <0.0080 8/8/2018 49.4 5.68 6.42 113.8 18.9 <10.0 9.7 <1.0 <5.0 <5.0 NS NS NS <10.0 <5.0 56.1 <5.0 56.1 <0.52 <0.50 0.094 123 1.3 <0.10 <1.0 <0.0080 3/27/2019 NM NM NM NM NM <10.0 <5.0 <1.0 <5.0 <5.0 36.7 NS 8.1 <10.0 <5.0 61.1 <5.0 61.1 <0.52 <0.50 0.097 114 <1.0 <0.10 <1.0 <0.0080 4/26/2019 9.26 5.18 6.54 113.8 16.0 <10.0 5.8 <1.0 <5.0 <5.0 38.3 <0.20 19.3 <10.0 <5.0 61.9 <5.0 61.9 0.72 0.63 0.092 139 1.0 <0.10 <1.0 <0.0080 6/25/2019 6.34 4.92 6.70 114.8 18.3 <10.0 9.70 <1.0 <5.0 <5.0 37.2 <0.20 37.9 <10.0 <5.0 62.30 <5.0 62.30 <0.52 <0.50 0.091 99.00 1.30 0.10 <1.0 <0.0080 7/24/2019 28.30 5.47 6.73 114.0 17.7 <10.0 5.1 <1.0 <5.0 <5.0 30.5 NS 17.5 <10.0 <5.0 58.3 <5.0 58.3 <0.52 <0.50 0.082 84.0 1.0 <0.10 <1.0 <0.0080 OW-2S 8/21/2019 45.0 4.93 6.45 116.1 20.5 <10.0 14.1 <1.0 <5.0 <5.0 40.4 <0.20 65.5 <10.0 <5.0 58.3 <5.0 58.3 <0.52 <0.50 <0.087 107 1.2 0.12 <1.0 <0.0080 9/25/2019 9.02 4.65 6.12 11.2 18.0 <10.0 <5.0 <1.0 <5.0 <5.0 33.7 <0.20 15.4 <10.0 <5.0 62.0 <5.0 62.0 <0.52 <0.50 0.087 106 1.1 <0.10 <1.0 <0.0080 10/29/2019 9.86 6.38 6.56 114.8 18.3 <10.0 <5.0 <1.0 <5.0 <5.0 37.1 <0.20 11.1 <10.0 <5.0 55.9 <5.0 55.9 <0.52 <0.50 0.100 99.0 <1.0 <0.10 <1.0 <0.0080 11/21/2019 64.6 7.41 6.67 119.9 18.6 <10.0 7.8 <1.0 <5.0 <5.0 44.7 <0.20 38.1 <10.0 <5.0 62.8 <5.0 62.8 <0.52 <0.50 0.094 118 1.0 <0.10 <1.0 <0.0080 12/18/2019 9.95 4.87 6.47 115.8 16.9 <10.0 8.7 <1.0 <5.0 <5.0 43.0 <0.20 51.2 <10.0 <5.0 60.3 <5.0 60.3 <0.52 <0.50 0.073 116 1.1 <0.10 <1.0 <0.0080 1/28/2020 7.52 5.82 6.65 109.3 16.0 <10.0 <5.0 <1.0 <5.0 <5.0 38.8 <0.20 10.3 <10.0 <5.0 58.7 <5.0 58.7 <0.52 <0.50 0.089 91.0 1.0 <0.10 <1.0 <0.0080 2/26/2020 8.30 5.03 6.21 115.0 15.6 <10.0 <5.0 <1.0 <5.0 <5.0 38.7 <0.20 12.4 <10.0 <5.0 58.3 <5.0 1 58.3 <0.52 <0.50 0.086 87.0 1.1 <0.10 <1.0 <0.0080 TABLE 3 SUMMARY OF GROUNDWATER QUALITY DATA PIEDMONT LITHIUM, INC. GASTON COUNTY, NORTH CAROLINA Field Measurements Alkalinity Nitrogen Location Date Turbidity (NTU) DO (mg/L) pH (SU) Specific Conductivity (PS/cm) Temperature (°C) Arsenic (ug/L) Barium (ug/L) Cadmium (ug/L) Chromium (ug/L) Lead (ug/L) Lithium (ug/L) Mercury (ug/L) Manganese (ug/L) Selenium (ug/L) Silver (ug/L) Bicarbonate ( (mg L) Carbonate ( (mg L) Total (mg L) Total �mgg) Total Keldahl Nitrogen Nitrogen, N (mg/L) Total Dissolved Solids (mg/L) Chloride (mg/L) Fluoride (mg/L) Sulfate (mg/L) Cyanide (mg/L) 8/8/2018 2.63 9.09 7.56 173.5 17.3 <10.0 <5.0 <1.0 <5.0 <5.0 NS NS NS <10.0 <5.0 89.1 <5.0 89.1 <0.52 <0.50 0.1 128.0 1.1 0.1 <1.0 <0.0080 3/27/2019 NM NM NM NM NM <10.0 <5.0 <1.0 <5.0 <5.0 108.0 NS 7.8 <10.0 <5.0 89.2 <5.0 89.2 <0.52 <0.50 0.2 125.0 1.1 <0.10 <1.0 <0.0080 4/26/2019 0.96 5.14 1 7.28 166.2 15.7 <10.0 1 <5.0 <1.0 <5.0 1 <5.0 100.0 1 <0.20 <5.0 <10.0 1 <5.0 93.3 <5.0 1 93.3 <0.52 1 <0.50 0.2 139.0 1.1 <0.10 <1.0 <0.0080 6/25/2019 1.47 4.69 7.16 163.1 16.5 <10.0 <5.0 <1.0 <5.0 <5.0 92.5 <0.20 <5.0 <10.0 <5.0 91.3 <5.0 91.3 <0.52 <0.50 0.2 119.0 1.1 <0.10 <1.0 <0.0080 7/24/2019 1.75 5.12 7.21 164.4 16.8 <10.0 <5.0 <1.0 <5.0 <5.0 90.2 NS 18.5 <10.0 <5.0 88.9 <5.0 88.9 <0.52 <0.50 0.14 106 1.1 <0.10 <1.0 <0.0080 8/21/2019 3.88 5.10 7.09 165.2 19.8 <10.0 <5.0 <1.0 <5.0 <5.0 102.0 <0.20 9.8 <10.0 <5.0 86.2 <5.0 86.2 <0.52 <0.50 0.14 113 1.3 0.1 <1.0 <0.0080 OW-21D 9/25/2019 0.84 4.93 6.41 161.5 17.0 <10.0 <5.0 <1.0 <5.0 <5.0 96.4 <0.20 <5.0 <10.0 <5.0 93.0 <5.0 93.0 <0.52 <0.50 0.14 109 1.1 <0.10 <1.0 <0.0080 10/29/2019 0.81 6.05 7.19 164 17 <10.0 <5.0 <1.0 <5.0 <5.0 102 <0.20 <5.0 <10.0 <5.0 85.1 <5.0 85.1 <0.52 <0.50 0.14 117 1.1 <0.10 <1.0 <0.0080 11/21/2019 2.83 5.24 7.77 165.5 15.6 <10.0 <5.0 <1.0 <5.0 <5.0 107 <0.20 5.8 <10.0 <5.0 88.4 <5.0 88.4 <0.52 <0.50 0.15 122 1.1 <0.10 <1.0 <0.0080 12/18/2019 0.54 4.54 7.16 166.6 15.3 <10.0 <5.0 <1.0 <5.0 <5.0 109 <0.20 <5.0 <10.0 <5.0 89.5 <5.0 89.5 <0.52 <0.50 0.14 111 1.1 <0.10 <1.0 <0.0080 1/29/2020 0.39 5.72 7.22 158.1 14.6 <10.0 <5.0 <1.0 <5.0 <5.0 110 0.28 <5.0 <10.0 <5.0 88.3 <5.0 88.3 <0.52 <0.50 0.14 107 1.1 <0.10 <1.0 <0.0080 2/26/2020 0.49 5.25 7.31 167.0 15.0 <10.0 <5.0 <1.0 <5.0 <5.0 97.4 <0.20 <5.0 <10.0 <5.0 90.4 <5.0 90.4 <0.52 <0.50 0.13 102 1.1 <0.10 <1.0 <0.0080 8/9/2018 1.83 5.49 6.56 166.0 16.8 <10.0 <5.0 <1.0 <5.0 <5.0 NS NS NS <10.0 <5.0 82.5 <5.0 82.5 <0.52 <0.50 0.3 121.0 1.7 <0.10 <1.0 <0.0080 3/27/2019 NM NM NM NM NM 26.0 <5.0 <1.0 <5.0 <5.0 1060 NS 17.1 <10.0 <5.0 72.4 <5.0 72.4 <0.52 <0.50 <0.040 110.0 1.3 2.3 8.7 <0.0080 4/25/2019 0.28 0.19 8.66 158.1 15.5 20.5 <5.0 <1.0 <5.0 <5.0 1000 <0.20 9.2 <10.0 <5.0 68.8 <5.0 68.8 0.6 0.6 <0.040 122.0 1.2 2.5 8.9 <0.0080 6/26/2019 0.28 0.36 8.54 150.5 15.9 13.0 <5.0 <1.0 <5.0 <5.0 1070 <0.20 6.4 <10.0 <5.0 64.0 <5.0 64.0 <0.52 <0.50 <0.040 101.0 1.2 2.8 8.8 <0.0080 7/23/2019 0.26 0.47 8.69 147.0 18.8 10.2 <5.0 <1.0 <5.0 <5.0 1100 NS 6.2 <10.0 <5.0 60 <5.0 60 <0.52 <0.50 <0.040 74.0 1.3 2.9 8.7 <0.0080 8/22/2019 0.23 0.33 8.62 151.5 18.2 <10.0 <5.0 <1.0 <5.0 <5.0 1190 <0.20 5.8 <10.0 <5.0 62.2 <5.0 62.2 <0.52 <0.50 <0.040 87.0 1.4 3.1 10.0 <0.0080 PW-1 9/25/2019 1.36 0.97 7.63 144.5 16.4 <10.0 <5.0 <1.0 <5.0 <5.0 1220 <0.20 6.5 <10.0 <5.0 64.1 <5.0 64.1 <0.52 <0.50 <0.040 110 1.3 2.7 9.1 <0.0080 10/29/2019 0.17 0.24 8.75 152.6 16.1 <10.0 <5.0 <1.0 <5.0 <5.0 1220 <0.20 5.3 <10.0 <5.0 60.7 <5.0 60.7 <0.52 <0.50 <0.040 102 1.2 2.8 9.7 <0.0080 11/20/2019 0.67 0.38 8.64 156.0 15.6 <10.0 <5.0 <1.0 <5.0 <5.0 1370 <0.20 5.1 <10.0 <5.0 62.5 <5.0 62.5 <0.52 <0.50 <0.040 115 1.3 2.9 9.4 <0.0080 12/18/2019 0.38 0.14 8.66 157.0 14.7 <10.0 <5.0 <1.0 <5.0 <5.0 1350 <0.20 5.2 <10.0 <5.0 66.2 <5.0 66.2 <0.52 <0.50 <0.040 97.0 1.2 2.4 8.9 <0.0080 1/29/2020 0.20 2.40 8.66 150.0 13.7 <10.0 <5.0 <1.0 <5.0 <5.0 1320 0.27 5.0 <10.0 <5.0 65.9 <5.0 65.9 <0.52 <0.50 <0.040 98.0 1.2 2.8 9.7 0.010 2/27/2020 0.38 0.77 8.69 157.7 13.6 <10.0 <5.0 <1.0 <5.0 <5.0 1210 <0.20 5.2 <10.0 <5.0 69.9 <5.0 69.9 <0.52 <0.50 <0.040 74.0 1.2 2.6 9.2 <0.0080 NCAC 2L Standards -- -- 6.5-8.5 -- I 10 700 2 10 15 -- -- 50 20 20 -- -- -- -- -- 11 -- 250 2 250 70 Notes: NTU - nephelometric turbidity units mg/L - miligrams per liter SU - standard units pS/cm - microsiemens per centimeter NM - not measured NS - not sampled -- - no established NCAC 2L Standard for analyte 8.75 - Result is above NCAC 2L Standards Sample diluted due to the presence of high levels of non -target analytes or other matrix interference Aluminum, Antimony, Beryllium, Calcium, Copper, Iron, Potassium, Sodium, Thallium and Zinc were analyzed in August 2018; Refer to Technical Memorandum from March 1, 2019 TABLE 4 SUMMARY OF SURFACE WATER QUALITY DATA PIEDMONT LITHIUM, INC. GASTON COUNTY, NORTH CAROLINA Field Measurements Metals Alkalinity Chlorophyll & Pheopytin Nitrogen Location Date Total Preci itation P in Past72 Hours Turbidity (NTU) DO (mg/L) pH Specific Conductivity (�/cm) ORP (mv) Temperature (°C) Arsenic (pg/L) Barium (pg/L) Cadmium (pg/L) Chromium (pg/L) Lead (pg/L) Lithium (pg/L) Manganese (pg/L) Selenium (pg/L) Silver (pg/L) Mercury (pg/L) Bicarbonate (CaCO3) (mg/L) Carbonate (CaCO3) (mg/L) Total CaCO3 (mg/L) Chlorophyll a (mg/m^3) Chlorophyll b (mg/m^3) Chlorophyll c (mg/m^3) Chlorophyll a (Corrected) (mg/m^3) Pheophytin (mg/m^3) Total Nitrogen (mg/L) Nitrogen, Ammonia (mg/L) Total Kjeldahl Nitrogen (mg/L) Nitrogen, NO2+NO3 (mg/L) Total Suspended Solids (mg/L) Total Dissolved Solids (mg/L) Chloride (mg/L) Fluoride (mg/L) Sulfate (mg/L) Phosphorus (mg/L) Cyanide (mg/L) 2/14/2019 0.72 8.52 15.55 6.17 61.3 298.1 6.1 NS NS NS NS NS NS NS NS NS NS NS NS NS 10.4 <7.7 <7.7 <7.7 14.9 NS <0.10 NS NS 4.1 NM NM NM NM <0.050 NM 3/21/2019 0.00 NM 12.50 6.55 147.8 179.7 9.8 <10.0 12.4 <1.0 <5.0 <5.0 10.8 24.9 <10.0 <5.0 <0.20 21.7 <5.0 21.7 <5.0 <5.0 <5.0 <5.0 72.2 0.79 <0.10 <0.50 0.53 4.4 52.0 3.5 <0.10 2.6 <0.050 <0.0080 4/23/2019 1.69 10.30 9.82 7.31 68.5 41.3 13.6 <10.0 17.3 <1.0 <5.0 <5.0 12.4 44 <10.0 <5.0 <0.20 22.7 <5.0 22.7 <5.0 <5.0 <5.0 <5.0 <5.0 0.87 <0.10 <0.50 0.56 7.9 80 3.4 <0.10 2.6 <0.050 <0.0080 5/23/2019 0.00 NM 8.24 7.40 69.7 35.5 18.6 <10.0 15.3 <1.0 <5.0 <5.0 17.8 47 <10.0 <5.0 <0.20 21.2 <5.0 21.2 <5.0 <5.0 <5.0 <5.0 <5.0 1.10 <0.10 <0.50 0.65 9.0 71.0 3.8 <0.10 1.7 0.06 <0.0080 6/13/2019 1.11 15.4 15.16 8.67 70.6 121.8 17.1 <10.0 16.3 <1.0 <5.0 <5.0 15.2 42.9 <10.0 <5.0 <0.20 22.7 <5.0 22.7 5.2 <5.0 <5.0 <5.0 <5.0 0.83 <0.10 <0.50 0.53 4.9 59.0 3.7 <0.10 2.0 <0.050 <0.0080 7/2/2019 0.02 9.8 7.89 6.99 76.6 -61.9 21.5 <10.0 15.0 <1.0 <5.0 <5.0 16.9 52.0 <10.0 <5.0 <0.20 27.2 <5.0 27.2 <5.2 <5.2 <5.2 <5.2 7.7 1.0 <0.10 <0.50 0.64 6.2 51.0 3.7 <0.10 1.5 0.054 <0.0080 Site-1 8/20/2019 0.00 21.3 1 7.55 7.57 72.2 24.0 21.9 <10.0 17.3 <1.0 <5.0 <5.0 16.6 75.2 <10.0 <5.0 <0.20 26.9 <5.0 26.9 3.1 NM NM NM <2.0 0.85 <0.10 <0.50 0.42 12.7 80.0 1 3.2 <0.10 2.1 0.083 <0.0080 9/23/2019 0.00 6.3 7.59 7.37 71.0 47.0 18.0 <10.0 11.2 <1.0 <5.0 <5.0 25.0 49.7 <10.0 <5.0 <0.20 31.5 <5.0 31.5 <2.0 NM NM NM <2.0 <0.52 <0.10 <0.50 0.36 3.0 65.0 3.6 <0.10 1.0 0.054 <0.0080 10/21/2019 1.56 8.22 9.29 7.11 70.4 134.7 14.1 <10.0 11.8 <1.0 <5.0 <5.0 17.5 41.1 <10.0 <5.0 <0.20 1 26.0 <5.0 26.0 <2.0 NM NM NM <2.0 <0.52 <0.10 <0.50 1 0.32 4.6 73.0 4.0 <0.10 1.9 0.069 <0.0080 11/19/2019 0.03 3.22 10.97 7.50 1 74.7 36.5 1 9.1 <10.0 1 11.4 <1.0 1 <5.0 <5.0 19.3 28.4 <10.0 1 <5.0 NM 28.9 <5.0 28.9 2.1 1 NM NM NM <2.0 0.56 <0.10 <0.50 0.33 <2.5 65 4.2 <0.10 1.6 <0.050 <0.0080 12/16/2019 1.60 12.1 10.72 7.01 70.8 -145.6 8.2 <10.0 16.6 <1.0 <5.0 <5.0 13.4 45.1 <10.0 <5.0 <0.20 21.4 <5.0 21.4 <2.0 NM NM NM <2.0 1.0 <0.10 <0.50 0.68 5.8 78.0 3.9 <0.10 3.6 0.055 <0.0080 1/27/2020 1.22 11.50 13.05 7.83 61.3 103.5 6.9 <10.0 16.1 <1.0 <5.0 <5.0 11.3 31.1 <10.0 <5.0 <0.20 19.4 <5.0 19.4 4.7 NM NM NM <2.0 0.96 <0.10 <0.50 0.65 6.9 42 3.6 <0.10 3.4 <0.050 <0.0080 2/14/2019 0.72 7.91 19.04 6.59 55.8 251.7 7 NS NS NS NS NS NS NS NS NS NS NS NS NS <5.0 <5.0 <5.0 <5.0 66.5 NS <0.10 NS NS <2.5 NM NM NM NM <0.050 NM 3/21/2019 0.00 NM 1 12.19 6.93 145.6 108.9 10.6 <10.0 11.0 <1.0 <5.0 <5.0 26.3 13.1 <10.0 <5.0 <0.20 23.1 <5.0 23.1 <5.0 <5.0 <5.0 <5.0 88.0 0.58 <0.10 <0.50 0.39 4.3 57.0 2.7 <0.10 1 1.2 <0.050 <0.0080 4/23/2019 1 1.69 9.40 10.70 7.21 64.4 7.5 13.5 <10.0 15.7 <1.0 <5.0 <5.0 32.2 29.4 <10.0 <5.0 <0.20 25 <5.0 25 <5.0 <5.0 <5.0 <5.0 1 <5.0 0.72 <0.10 <0.50 0.47 5.5 107 2.7 <0.10 1.2 0.051 <0.0080 5/23/2019 0.00 NM 8.11 7.15 65.9 36.4 17.7 <10.0 18.1 <1.0 <5.0 <5.0 37.5 28.4 <10.0 <5.0 <0.20 23.4 <5.0 23.4 <5.0 <5.0 <5.0 <5.0 7.0 0.91 <0.10 <0.50 0.54 9.1 85.0 2.7 <0.10 <1.0 0.066 <0.0080 6/13/2019 1.11 13.3 15.96 8.07 63.9 1 46.0 16.5 <10.0 15.8 1 <1.0 <5.0 <5.0 35.8 24.8 1 <10.0 <5.0 <0.20 23.2 <5.0 23.2 <5.0 <5.0 <5.0 <5.0 <5.0 0.71 <0.10 <0.50 0.44 4.1 58.0 2.8 <0.10 1.2 <0.050 <0.0080 7/2/2019 0.02 12.1 8.09 6.62 68.1 -52.0 19.8 <10.0 15.0 <1.0 <5.0 <5.0 38.2 27.2 <10.0 <5.0 <0.20 27.0 <5.0 27.0 <5.0 <5.0 <5.0 <5.0 <5.0 0.86 <0.10 <0.50 0.51 7.9 42.0 2.5 <0.10 <1.0 0.052 <0.0080 Site-2 8/20/2019 0.00 16.9 8.05 7.55 68.5 33.3 20.5 <10.0 18.3 <1.0 <5.0 <5.0 37.9 36.2 <10.0 <5.0 <0.20 28.4 <5.0 28.4 2.8 NM NM NM <2.0 0.57 <0.10 <0.50 0.32 11.6 84.0 2.5 <0.10 <1.0 0.072 <0.0080 9/23/2019 0.00 4.51 7.61 7.21 61.5 49.3 16.9 <10.0 12.4 <1.0 <5.0 <5.0 45.9 20.0 <10.0 <5.0 <0.20 30.0 <5.0 30.0 <2.0 NM NM NM <2.0 <0.52 <0.10 <0.50 0.25 2.8 63.0 2.2 <0.10 <1.0 <0.050 <0.0080 10/21/2019 1.56 9.83 1 9.81 7.57 56.4 109.6 14.0 <10.0 12.9 <1.0 <5.0 <5.0 39.5 9.9 <10.0 <5.0 <0.20 28.4 1 <5.0 28.4 <2.0 NM NM NM <2.0 <0.52 <0.10 <0.50 0.28 2.8 53.0 2.6 <0.10 1.1 0.054 <0.0080 11/19/2019 0.03 4.15 10.46 7.26 66.1 41.2 9.8 <10.0 14.0 <1.0 <5.0 <5.0 40.8 6.5 <10.0 <5.01 NM 28.9 <5.0 28.9 <2.0 1 NM NM NM <2.0 <0.52 <0.10 <0.50 0.24 3.1 57.0 2.7 <0.10 <1.0 <0.050 <0.0080 12/16/2019 1.60 7.93 10.09 7.12 1 63.6 -173.2 9.4 <10.0 1 14.2 <1.0 <5.0 <5.0 37.6 11.7 <10.0 <5.0 <0.20 22.9 <5.0 22.9 <2.0 NM NM NM <2.0 0.89 1 <0.10 <0.50 0.65 3.1 72.0 3 <0.10 1.5 0.056 <0.0080 1/27/2020 1.22 7.51 12.48 7.54 57.4 88.4 1 7.5 <10.0 17.6 <1.0 I <5.0 <5.0 32.0 13.7 <10.0 <5.0 <0.20 22.4 <5.0 22.4 <2.0 NM NM NM <2.0 0.82 <0.10 <0.50 0.63 3.2 42.0 2.8 <0.10 1.4 <0.050 <0.0080 2/14/2019 0.72 9.89 26.75 7.05 61.1 221.7 6.5 NS NS NS NS NS NS NS NS NS NS NS NS NS 10.5 <5.0 <5.0 <5.0 15.7 NS <0.10 NS NS 5.6 NM NM NM NM <0.050 NM 3/21/2019 0.00 NM 11.80 6.97 151.3 132.2 10.2 <10.0 12.1 <1.0 <5.0 <5.0 10.2 27.3 <10.0 <5.0 <0.20 21.5 <5.0 21.5 <5.0 <5.0 <5.0 <5.0 91.0 0.86 <0.10 <0.50 0.53 4.8 57.0 3.5 <0.10 2.7 <0.050 <0.0080 4/23/2019 1.69 10.8 9.60 6.92 68.0 45.2 13.9 <10.0 170.0 <1.0 <5.0 <5.0 12.4 53.4 <10.0 <5.0 <0.20 22.9 <5.0 1 22.9 <5.0 <5.0 <5.0 <5.0 <5.0 0.92 <0.10 <0.50 1 0.57 12.3 120 3.4 <0.10 2.7 <0.050 <0.0080 5/23/2019 1 0.00 NM 1 7.65 6.94 69.3 34.2 18.9 <10.0 22.5 <1.0 <5.0 <5.0 19.2 161.0 <10.0 1 <5.0 <0.20 21.7 <5.0 21.7 <5.0 <5.0 <5.0 <5.0 23.5 2.20 <0.10 1.5 0.66 27.9 74.0 3.7 <0.10 1.7 1 0.089 <0.0080 6/13/2019 1.11 13.4 15.96 8.07 63.9 46.0 16.5 <10.0 16.6 <1.0 <5.0 <5.0 13.9 49.3 <10.0 <5.0 <0.20 23.3 <5.0 23.3 <5.0 1 <5.0 <5.0 <5.0 <5.0 0.80 <0.10 <0.50 0.55 5.9 59.0 3.9 <0.10 2.3 <0.50 <0.0080 7/2/2019 0.02 8.15 6.83 7.04 77.0 -79.8 21.4 <10.0 14.5 <1.0 <5.0 <5.0 17.0 55.3 <10.0 <5.0 <0.20 26.5 <5.0 26.5 <5.3 <5.3 <5.3 <5.3 7.1 1.10 <0.10 <0.50 0.64 4.9 61.0 3.7 <0.10 1.4 0.055 <0.0080 Site-3 8/20/2019 0.00 12.2 7.90 7.37 73.3 38.3 1 21.9 <10.0 19.4 <1.0 <5.0 <5.0 17.0 112 <10.0 <5.0 <0.20 28.2 <5.0 28.2 4.5 NM NM NM 4.9 0.83 <0.10 <0.50 0.44 56.6 69.0 3.5 <0.10 1.6 0.087 <0.0080 9/23/2019 0.00 7.4 7.19 7.14 70.1 52.8 17.7 <10.0 10.9 <1.0 <5.0 <5.0 22.9 51.8 <10.0 <5.0 <0.20 30.5 <5.0 30.5 <2.0 NM NM NM <2.0 0.61 <0.10 <0.50 0.39 <2.5 70.0 3.5 <0.10 1.2 0.051 <0.0080 10/21/2019 1.56 10.5 8.27 7.23 72.5 110.8 14.2 <10.0 11.6 <1.0 <5.0 <5.0 17.4 36.6 <10.0 <5.0 <0.20 26.7 <5.0 26.7 <2.0 NM NM NM <2.0 0.71 <0.10 <0.50 0.32 1 8.1 54.0 4.2 <0.10 1.8 0.059 <0.0080 11/19/2019 0.03 3.98 9.58 7.47 75.2 34.6 9.4 <10.0 12.1 <1.0 <5.0 <5.0 17.9 34.2 <10.0 <5.01 NM 28.5 1 <5.0 28.5 2.0 NM NM NM <2.0 0.6 <0.10 <0.50 0.33 <2.5 1 68.0 5.5 <0.10 2.3 <0.050 <0.0080 12/16/2019 1.60 12.8 1 10.83 7.07 71.2 -160.6 8.6 <10.0 16.2 <1.0 <5.0 <5.0 12.5 43.4 <10.0 <5.0 <0.20 20.6 <5.0 20.6 3.6 NM NM NM <2.0 1.1 <0.10 <0.50 0.69 7.1 76.0 4 <0.10 3.6 1 0.052 <0.0080 1/27/2020 1.22 11.1 13.34 7.39 61.3 98.2 7.1 <10.0 17.5 <1.0 <5.0 <5.0 11.1 35.0 <10.0 <5.0 <0.20 19.3 <5.0 19.3 4.7 NM NM NM <2.0 1.0 1 <0.10 <0.50 0.68 6.2 47.0 3.7 <0.10 3.5 0.051 <0.0080 2/14/2019 0.72 7.06 14.10 6.73 67.8 232.8 7.0 NS NS NS NS NS NS NS NS NS NS NS NS NS 16.0 <5.0 <5.0 <5.0 64.4 NS <0.10 NS NS 4.8 NM NM NM NM <0.050 NM 3/21/2019 0.00 NM 12.80 7.03 156.5 119.51 10.6 <10.0 13.7 <1.0 <5.0 <5.0 8.7 21.2 <10.0 <5.0 <0.20 24.8 <5.0 24.8 7.9 <5.9 <5.9 <5.9 107 0.90 <0.10 <0.50 0.54 5.4 66.0 3.6 <0.10 2.9 <0.050 <0.0080 4/23/2019 1.69 9.91 10.10 6.83 74.7 66.3 14.4 <10.0 20.3 <1.0 <5.0 <5.0 10.1 39.1 <10.0 <5.0 <0.20 25.9 <5.0 25.9 <5.0 <5.0 <5.0 <5.0 20.5 0.95 <0.10 <0.50 0.61 8 75 3.4 <0.10 2.9 0.053 <0.0080 5/23/2019 0.00 NM 7.94 7.00 78.9 25.2 18.8 <10.0 17.8 <1.0 <5.0 <5.0 14.3 37.0 <10.0 1 <5.0 <0.20 28.0 <5.0 28.0 <5.0 <5.0 <5.0 <5.0 19.4 1.2 <0.10 <0.50 0.78 5.8 875 3.6 <0.10 1.9 0.064 <0.0080 6/13/2019 1 1.11 11.60 7.79 7.34 78.5 88.9 17.4 <10.0 20.2 <1.0 <5.0 <5.0 12.0 36.0 <10.0 <5.0 <0.20 27.2 <5.0 27.2 <5.0 <5.0 <5.0 <5.0 <5.0 0.87 <0.10 <0.50 0.58 4.6 76.0 3.8 <0.10 2.4 <0.050 <0.0080 7/2/2019 0.02 11.4 7.54 7.00 82.9 -84.1 21.7 <10.0 17.5 <1.0 <5.0 <5.0 14.3 50.2 <10.0 <5.0 <0.20 30.1 <5.0 30.1 5.7 <5.3 <5.3 <5.3 9.1 1.20 <0.10 <0.50 0.73 7.0 70.0 3.7 <0.10 1.6 0.07 <0.0080 Site 4 8/20/2019 0.00 9.79 8.53 7.34 80.6 33.3 22.0 <10.0 20.1 1 <1.0 <5.0 1 <5.0 13.0 57.3 <10.0 <5.0 <0.20 31.9 <5.0 31.9 7.1 NM NM NM <2.0 0.81 <0.10 <0.50 0.48 10.7 78.0 3.6 <0.10 1.9 0.11 <0.0080 9/23/2019 0.00 3.54 7.65 6.93 81.6 57.6 18.1 <10.0 12.6 <1.0 <5.0 <5.0 20.6 32.7 <10.0 <5.0 <0.20 35.1 <5.0 35.1 <2.0 NM NM NM <2.0 0.77 <0.10 <0.50 0.57 <2.5 72.0 3.7 <0.10 1.3 0.073 <0.0080 10/21/2019 1.56 4.34 8.83 6.74 70.7 102.E 14.4 <10.0 13.4 <1.0 <5.0 <5.0 14.4 23.4 <10.0 <5.0 <0.20 30.4 <5.0 30.4 <2.0 NM NM NM <2.0 0.73 <0.10 <0.50 0.41 2.7 69.0 4.3 <0.10 2.3 0.066 <0.0080 11/19/2019 0.03 3.31 11.46 7.18 61.0 42.2 9.6 <10.0 13.8 <1.0 <5.0 <5.0 15.3 18.4 <10.0 <5.0 NM 33.8 <5.0 33.8 <2.0 NM NM NM <2.0 0.68 <0.10 <0.50 0.38 <2.5 70.0 4.4 <0.10 1.7 0.055 <0.0080 12/16/2019 1.60 8.35 10.21 6.86 78.3 -205.7 9.0 <10.0 18.1 <1.0 <5.0 <5.0 10.3 36.0 <10.0 <5.0 <0.20 25.3 <5.0 25.3 3.3 NM NM NM <2.0 1.1 <0.10 <0.50 0.72 6.7 73.0 4.1 <0.10 3.6 0.063 <0.0080 1/27/2020 1.22 9.99 13.18 6.91 67.6 104.4 7.5 <10.0 19.2 <1.0 <5.0 <5.0 9.9 27.7 <10.0 <5.0 <0.20 22.5 <5.0 22.5 6.7 1 NM NM NM <2.0 1.1 <0.10 <0.50 0.70 7.7 55.0 3.7 <0.10 1 3.5 0.067 <0.0080 2/14/2019 0.72 10.22 1 14.41 6.32 50.7 190.9 6.8 NS NS NS NS NS NS NS NS NS NS NS NS NS 6.6 <5.0 <5.0 <5.0 61.0 NS <0.10 NS NS 3.2 NM NM NM NM <0.050 NM 3/21/2019 0.00 NM 12.18 6.61 140.4 122.4 10.3 <10.0 9.4 <1.0 <5.0 <5.0 1 10.3 33.3 <10.0 <5.0 <0.20 13.7 <5.0 13.7 <6.4 <6.4 <6.4 <6.4 172 0.79 <0.10 <0.50 0.53 <3.3 48.0 3.6 <0.10 2.4 <0.050 <0.0080 4/23/2019 1.69 10.2 9.92 6.71 1 57.0 45.6 14.2 <10.0 13.1 <1.0 <5.0 <5.0 13.8 61.9 <10.0 <5.0 <0.20 15.3 <5.0 15.3 <5.0 <5.0 <5.0 <5.0 <5.0 0.84 <0.10 <0.50 0.55 4.8 102 3.5 <0.10 2.4 <0.050 <0.0080 5/23/2019 0.00 NM 7.43 7.01 52.1 38.9 1 18.8 <10.0 11.7 <1.0 <5.0 <5.0 18.2 58.9 <0.50 <0.40 <0.20 16.6 <5.0 16.6 <5.6 <5.6 <5.6 <5.6 12.9 0.98 <0.10 <0.50 0.57 7.7 160 3.6 <0.10 1.4 <0.050 <0.0080 6/13/2019 1.11 11.2 8.08 7.28 50.1 96.6 17.3 <10.0 11.2 <1.0 <5.0 <5.0 16.8 55.7 1 <10.0 <5.0 <0.20 15.6 <5.0 15.6 <5.0 <5.0 <5.0 <5.0 <5.0 0.80 <0.10 <0.050 0.54 5.0 47.0 4.0 <0.10 2.1 <0.050 <0.0080 7/2/2019 0.02 10.8 7.77 6.78 63.2 -66.7 21.5 <10.0 10.5 <1.0 <5.0 <5.0 19.4 65.1 <10.0 <5.0 <0.20 21.4 <5.0 21.4 <5.0 <5.0 <5.0 <5.0 <5.0 0.87 <0.10 <0.50 0.53 6.9 45.0 3.8 <0.10 1.2 <0.05 <0.0080 Site-5 8/20/2019 0.00 6.18 8.11 7.36 61.4 31.4 21.8 <10.0 10.9 <1.0 <5.0 <5.0 19.2 79.2 <10.0 <5.0 <0.20 23.0 1 <5.0 23.0 2.0 NM NM NM <2.0 0.71 <0.10 <0.50 0.36 3.0 52.0 3.5 <0.10 <1.0 <0.050 <0.0080 9/23/2019 0.00 5.59 1 7.48 7.01 54.6 42.9 17.9 <10.0 8.0 <1.0 <5.0 <5.0 24.2 49.4 <10.0 <5.0 <0.20 23.1 <5.0 23.1 <2.0 NM NM NM <2.0 0.53 <0.10 <0.50 0.22 4.3 55.0 3.5 <0.10 1.1 <0.050 1 <0.0080 10/21/2019 1.56 6.93 9.93 6.74 59.9 126.1 14.3 <10.0 8.9 <1.0 <5.0 1 <5.0 1 18.7 33.8 <10.0 <5.0 <0.20 21.5 <5.0 21.5 <2.0 NM NM NM <2.0 <0.52 <0.10 <0.50 0.25 <2.5 45.0 4.2 <0.10 1.3 <0.050 <0.0080 11/19/2019 0.03 3.04 11.941 7.42 11 60.5 39.0 9.7 <10.0 8.9 <1.0 <5.0 <5.0 21.2 45.4 <10.0 <5.01 NM 21.7 <5.0 21.7 <2.0 NM NM NM <2.0 <0.52 <0.10 <0.50 0.26 <2.5 54.0 4.1 <0.10 1.6 <0.050 <0.0080 12/16/2019 1.60 14.4 1 9.62 1 6.69 1 58.9 -199.7 8.7 <10.0 13.8 <1.0 <5.0 <5.0 14.1 51.0 <10.0 <5.0 <0.20 14.7 <5.0 14.7 <2.0 NM NM NM <2.0 0.91 <0.10 <0.50 0.66 5.2 52.0 4.0 <0.10 3.7 <0.050 <0.0080 1/27/2020 1.22 13.5 13.13 7.12 46.3 99.7 7.2 <10.0 13.4 <1.0 <5.0 <5.0 12.6 43.4 <10.0 <5.0 <0.20 14.3 <5.0 14.3 <2.0 NM NM NM <2.0 0.98 <0.10 <0.50 0.62 5.0 47.0 3.7 <0.10 3.3 <0.050 <0.0080 TABLE 4 SUMMARY OF SURFACE WATER QUALITY DATA PIEDMONT LITHIUM, INC. GASTON COUNTY, NORTH CAROLINA Field Measurements Metals Alkalinity Chlorophyll & Pheopytin Nitrogen Location Date Total P Preci st 72n nPast72 Hours Turbidity (NTU) DO (mg/L) pH Specific Conductivity (/cm) ORP (mv) Temperature (°C) Arsenic (pg/L) Barium (pg/L) Cadmium (pg/L) Chromium (pg/L) Lead (pg/L) Lithium (pg/L) Manganese (pg/L) Selenium (pg/L) Silver (pg/L) Mercury (pg/L) Bicarbonate (CaCO3) (mg/L) Carbonate (CaCO3) (mg/L) Total CaCO3 (mg/L) Chlorophyll a (mg/m^3) Chlorophyll b (mg/m^3) Chlorophyll c (mg/m^3) Chlorophyll a (Corrected) (mg/m^3) Pheophytin (mg/m^3) Total Nitrogen (mg/L) Nitrogen, Ammonia (mg/L) Total Kjeldahl Nitrogen (mg/L) Nitrogen, NO2+NO3 (mg/L) Total Suspended Solids (mg/L) Total Dissolved Solids (mg/L) Chloride (mg/L) Fluoride (mg/L) Sulfate (mg/L) Phosphorus (mg/L) Cyanide (mg/L) 2/14/2019 0.72 7.04 23.62 7.00 67.8 247.2 7.9 NS NS NS NS NS NS NS NS NS NS NS NS NS 20.7 <5.0 <5.0 <5.0 52.1 NS <0.10 NS NS 5.6 NM NM NM NM <0.050 NM 3/21/2019 0.00 NM 12.43 6.82 157.1 148.8 11.0 <10.0 15.0 <1.0 <5.0 <5.0 7.5 24.0 <10.0 <5.0 <0.20 24.2 <5.0 24.2 8.9 <5.6 <5.6 <5.6 167 0.94 <0.10 <0.50 0.57 5.9 66.0 3.6 <0.10 2.9 <0.050 <0.0080 4/23/2019 1.69 10.1 9.62 7.05 74.5 80.8 16.1 <10.0 20.9 <1.0 <5.0 <5.0 8.3 43 <10.0 <5.0 <0.20 25.2 <5.0 25.2 <5.0 <5.0 <5.0 <5.0 <5.0 1 <0.10 <0.50 0.63 9.6 101 3.4 <0.10 3.0 0.058 <0.0080 5/23/2019 0.00 NM 7.35 7.04 76.1 26.3 19.2 <10.0 18.7 <1.0 <5.0 <5.0 12.0 54.7 <10.0 <5.0 <0.20 26.2 <5.0 26.2 <5.0 <5.0 <5.0 <5.0 <5.0 1.2 <0.10 <0.50 0.73 6.1 33.0 3.7 <0.10 2.0 0.068 <0.0080 6/13/2019 1.11 11.6 7.88 7.22 78.8 91.1 17.8 <10.0 20.0 <1.0 <5.0 <5.0 9.4 45.7 <10.0 <5.0 <0.20 26.0 <5.0 26.0 <5.0 <5.0 <5.0 <5.0 6.7 0.98 <0.10 <0.50 0.61 5.6 72.0 4.0 <0.10 2.4 <0.050 <0.0080 7/2/2019 0.02 13.8 6.23 7.08 82.6 -85.6 21.9 <10.0 18.7 <1.0 <5.0 <5.0 10.7 73.0 <10.0 <5.0 <0.20 29.4 <5.0 29.4 9.5 <5.0 <5.0 <5.0 5.7 1.40 <0.10 0.63 0.73 8.9 60.0 3.8 <0.10 1.6 0.081 <0.0080 Site-6 8/20/2019 0.00 11.0 1 8.59 7.32 84.9 34.9 22.0 <10.0 19.9 <1.0 <5.0 <5.0 10.8 70.9 <10.0 <5.0 <0.20 33.7 <5.0 33.7 7.6 NM NM NM <2.0 0.93 <0.10 <0.50 0.51 8.4 79.0 3.7 1 <0.10 1.8 0.081 <0.0080 9/23/2019 0.00 4.66 7.29 7.17 80.1 45.9 18.1 <10.0 12.7 <1.0 <5.0 <5.0 15.0 58.4 <10.0 <5.0 <0.20 34.3 <5.0 34.3 <2.0 NM NM NM <2.0 0.89 <0.10 <0.50 0.56 <2.5 79.0 3.7 <0.10 1.3 0.075 <0.0080 10/21/2019 1.56 7.87 8.06 6.82 79.0 98.8 14.9 <10.0 1 15.8 <1.0 <5.0 <5.0 11.7 59.8 <10.0 <5.0 <0.20 31.6 <5.0 31.6 2.6 NM NM NM <2.0 0.79 <0.10 <0.50 0.44 5.3 70.0 4.3 <0.10 2.1 0.080 <0.0080 11/19/2019 0.03 6.20 11.01 7.41 85.5 39.7 10.1 <10.0 15.3 <1.0 <5.0 <5.0 12.4 41.6 <10.0 <5.0 NM 33.3 <5.0 33.3 5.3 NM NM NM <2.0 0.93 <0.10 0.5 0.43 <2.5 75.0 4.6 <0.10 1.9 0.062 <0.0080 12/16/2019 1.60 7.93 9.48 6.82 1 79.3 -201.9 9.7 <10.0 19 <1.0 1 <5.0 <5.0 1 9.5 1 42.3 <10.0 1 <5.0 <0.20 1 25.0 <5.0 1 25.0 6.7 1 NM NM NM <2.0 1.2 1 <0.10 0.51 0.71 4.9 62.0 4.1 <0.10 3.7 0.064 <0.0080 1/27/2020 1.22 9.70 12.66 6.91 67.6 103.5 8.0 <10.0 20.0 <1.0 <5.0 <5.0 8.4 31.3 <10.0 <5.0 <0.20 22.2 <5.0 22.2 8.1 NM NM NM <2.0 1.2 <0.10 <0.50 0.71 7.6 50.0 3.7 <0.10 3.5 0.070 <0.0080 2/14/2019 0.72 6.64 19.03 6.91 66.4 221.8 9.1 NS NS NS NS NS NS NS NS NS NS NS NS NS 19.7 <5.0 <5.0 14.6 7.5 NS <0.10 NS NS 7.2 NM NM NM NM <0.050 NM 3/21/2019 0.00 NM 1 11.56 6.74 156.1 113.9 11.5 <10.0 16.3 <1.0 <5.0 <5.0 6.4 23.3 <10.0 <5.0 <0.20 23.3 <5.0 23.3 10.2 <5.3 <5.3 <5.3 150 0.92 <0.10 <0.50 <0.55 6.5 1 65.0 3.7 1 <0.10 3.1 <0.050 <0.0080 4/23/2019 1.69 9.65 9.44 6.91 71.6 88.8 17.0 <10.0 21 <1.0 <5.0 <5.0 6.8 39.5 <10.0 <5.0 <0.20 24.2 <5.0 24.2 11.0 7.5 13.0 14.8 1 <5.0 1.1 <0.10 <0.50 1 0.62 10.8 84 3.5 <0.10 3.1 0.056 <0.0080 5/23/2019 1 0.00 NM 7.48 7.03 77.0 27.4 19.1 <10.0 19.5 <1.0 <5.0 <5.0 9.9 70.9 <10.0 <5.0 <0.20 25.8 <5.0 25.8 <5.0 <5.0 <5.0 <5.0 <5.0 1.4 <0.10 0.67 0.71 13.7 <25.0 3.8 <0.10 2.1 0.059 <0.0080 6/13/2019 1.11 9.00 7.73 6.97 79.3 84.8 18.3 <10.0 19.7 <1.0 <5.0 <5.0 7.8 50.3 <10.0 <5.0 <0.20 24.7 <5.0 <24.7 5.1 <5.0 <5.0 <5.0 <5.0 0.92 <0.10 <0.50 0.64 4.1 69.0 4.8 <0.10 2.6 <0.050 <0.0080 7/2/2019 0.02 8.86 7.08 6.73 79.7 -84.1 21.9 <10.0 18.5 <1.0 <5.0 <5.0 8.2 78.1 <10.0 <5.0 <0.20 27.4 <5.0 27.2 9.4 <5.0 <5.0 <5.0 <5.0 1.10 <0.10 <0.50 0.68 7.7 66.0 3.9 <0.10 1.7 0.069 <0.0080 Site-7 8/20/2019 0.00 11.2 8.61 7.52 84.7 33.6 21.9 <10.0 22.0 <1.0 <5.0 <5.0 8.0 112 <10.0 <5.0 <0.20 33.4 <5.0 33.4 9.5 NM NM NM <2.0 1.5 <0.10 1 0.45 13.4 69.0 4.0 <0.10 1.9 0.170 <0.0080 9/23/2019 0.00 8.5 7.96 6.84 77.6 60.7 18.8 <10.0 16.0 <1.0 <5.0 <5.0 10.8 115 <10.0 <5.0 <0.20 33.4 <5.0 33.4 3.1 NM NM NM <2.0 0.69 <0.10 <0.50 0.40 5.1 81.0 3.9 <0.10 1.5 0.075 <0.0080 10/21/2019 1.56 8.49 1 8.39 6.31 79.9 121.2 14.6 <10.0 17.8 <1.0 <5.0 <5.0 8.2 103 <10.0 <5.0 <0.20 29.9 <5.0 29.9 <2.0 NM NM NM <2.0 0.59 <0.10 <0.50 0.39 1 9.6 1 66.0 5.7 <0.10 2.3 0.078 <0.0080 11/19/2019 0.03 4.14 9.96 7.09 84.6 46.2 10.0 <10.0 16.5 <1.0 <5.0 <5.0 9.2 63.9 <10.0 <5.0 NM 31.9 <5.0 31.9 2.4 NM NM NM 1 <2.0 0.95 <0.10 0.55 0.41 <2.5 76.0 5.0 <0.10 2.2 0.057 I<0.0080 112/16/20191 1.60 6.90 9.34 6.68 68.4 -227.2 10.1 <10.0 19.8 <1.0 <5.0 <5.0 7.6 52.5 <10.0 <5.0 <0.20 25.0 <5.0 25.0 2.4 NM NM NM <2.0 1.2 <0.10 0.5 0.72 4.6 93.0 4.3 <0.10 3.9 0.062 <0.0080 1/27/2020 1.22 9.85 12.30 6.72 59.5 92.6 8.3 <10.0 19.8 <1.0 <5.0 <5.0 6.7 31.5 <10.0 <5.0 <0.20 21.3 <5.0 21.3 13.8 NM NM NM <2.0 1.2 <0.10 <0.50 0.69 7.6 50.0 3.8 <0.10 3.8 0.069 <0.0080 NCAC 2B Standards <50 6.0 - 9.0 10.0 170 NA 11 NA 5 NA 0.012 40 -- 10 500 250 1.8 250 5 Notes. NTU - nephelometric turbidity units mg/L - miligrams per liter SU - standard units pS/cm - microsiemens per centimeter my - milivolt mg/m^3 - miligram per meter cubed NM - not measured NS -not sampled NA - not applicable; surface water standards for these constituents are hardness dependent -- - no established NCAC 2L Standard for analyte 0.72 - non -ambient; Precipitation in the 72 hours prior to sampling was greater than 0.1 inch Precipitation amonutswere taken from CoCoRaHS Piedmont Lithium I Technical Memorandum — Water Quality Testing �� Tables FN 440 S Church Street, Suite 1000 Charlotte, NC 28202-2075 704.338.6700 hdrinc.com © 2020 HDR, Inc., all rights reserved