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/HILL Laboratories, Inc. <br />2773 Downhill Drive Steamboat Springs, CO 80487 (800) 334-5493 <br />Natural Soda, LLC <br />Project ID: <br />Sample ID: 90-4 <br />ACZ Sample ID: <br />L95738-02 <br />Date Sampled: <br />06/30/25 13:04 <br />Date Received: <br />07103125 <br />Sample Matrix: <br />Groundwater <br />Inorganic Prep <br />MethodParameter EPA Dilution Result Qual XQ Units MDQLDate Analyst <br />Lab Filtration (0.45um) EPA 200.7/200.8/3005A Filter 07/08/25 15:45 msp <br />& Acidification <br />Metals Analysis <br />Boron, dissolved <br />EPA 200.7 <br />5 <br />1.52 <br />* mg/L <br />0.15 <br />0.5 <br />07/15/25 20:46 <br />msp <br />Calcium, dissolved <br />EPA 200.7 <br />5 <br />15.3 <br />mg/L <br />0.5 <br />2.5 <br />07/15/25 20:46 <br />msp <br />Magnesium, dissolved <br />EPA 200.7 <br />5 <br />26.2 <br />mg/L <br />1 <br />5 <br />07/15/25 20:46 <br />msp <br />Potassium, dissolved <br />EPA 200.7 <br />5 <br />4.24 <br />B mg/L <br />2.5 <br />5 <br />07/15/25 20:46 <br />msp <br />Silica, dissolved <br />EPA 200.7 <br />5 <br />12 <br />mg/L <br />1 <br />5 <br />07/15/25 20:46 <br />msp <br />Sodium, dissolved <br />EPA 200.7 <br />5 <br />3210 <br />mg/L <br />1 <br />5 <br />07/15/25 20:46 <br />msp <br />Strontium, dissolved <br />EPA 200.7 <br />5 <br />6.05 <br />mg/L <br />0.045 <br />0.225 <br />07/15/25 20:46 <br />msp <br />Wet Chemistry <br />MethodParameter EPA Dilution <br />Result■ <br />®�� <br />'' <br />Alkalinity as CaCO3 <br />SM 2320 B-2011 <br />Bicarbonate as <br />1 <br />3950 <br />H <br />mg/L <br />3 <br />20 <br />07/15/25 0:00 <br />cjk <br />CaCO3 <br />Carbonate as CaCO3 <br />1 <br /><3 <br />UH <br />mg/L <br />3 <br />20 <br />07/15/25 0:00 <br />cjk <br />Hydroxide as CaCO3 <br />1 <br /><3 <br />UH <br />mg/L <br />3 <br />20 <br />07/15/25 0:00 <br />cjk <br />Total Alkalinity <br />1 <br />3950 <br />H <br />mg/L <br />3 <br />20 <br />07/15/25 0:00 <br />cjk <br />Cation -Anion Balance <br />Calculation <br />Cation -Anion Balance <br />-2.0 <br />% <br />07/25/25 0:00 <br />calc <br />Sum of Anions <br />150 <br />meq/L <br />07/25/25 0:00 <br />calc <br />Sum of Cations <br />144 <br />meq/L <br />07/25/25 0:00 <br />calc <br />Chloride <br />EPA 300.0 <br />50 <br />2510 <br />mg/L <br />20 <br />100 <br />07/23/25 14:45 <br />bls <br />Conductivity @25C <br />SM 2510 B-2011 <br />1 <br />12300 <br />umhos/cm <br />1 <br />10 <br />07/11/25 14:31 <br />jck <br />Fluoride <br />EPA 300.0 <br />50 <br />7.35 <br />B <br />mg/L <br />2.5 <br />12.5 <br />07/23/25 14:45 <br />bls <br />Hardness as CaCO3 <br />Calculation (SM 2340 B-2011) <br />146 <br />mg/L <br />1 <br />30 <br />07/25/25 0:00 <br />calc <br />(dissolved) <br />Lab Filtration (0.45um <br />SOPWC050 <br />1 <br />07/14/25 12:15 <br />rap <br />filter) <br />pH (lab) <br />SM 4500-H+ B-2011 <br />pH <br />1 <br />8.1 <br />H <br />units <br />0.1 <br />0.1 <br />07/11/25 0:00 <br />jck <br />pH measured at <br />1 <br />22.3 <br />C <br />0.1 <br />0.1 <br />07/11/25 0:00 <br />jck <br />Residue, Filterable <br />SM 2540 C-2011 <br />5 <br />8370 <br />mg/L <br />100 <br />200 <br />07/05/25 10:26 <br />cob <br />(TDS) @180C <br />Sodium Adsorption <br />USGS-11738-78 <br />120 <br />07/25/25 0:00 <br />calc <br />Ratio in Water <br />Sulfate <br />EPA 300.0 <br />50 <br /><45 <br />U <br />mg/L <br />45 <br />100 <br />07/24/25 15:47 <br />bls <br />TDS (calculated) <br />Calculation <br />8200 <br />mg/L <br />07/25/25 0:00 <br />calc <br />TDS (ratio - <br />Calculation <br />1.02 <br />07/25/25 0:00 <br />calc <br />measured/calculated) <br />Natural Soda LLC <br />Daub & Associates, Inc. Page 67 of 88 2025 2nd Quarter EPA Report <br />