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AUL Laboratories, Inc. <br />2773 Downhill Drive Steamboat Sorinos, CO 80487 (800) 334-5493 <br />Natural Soda, LLC <br />Project ID: <br />Sample ID: BG-6 <br />ACZ Sample ID <br />Date Sampled <br />Date Received <br />Sample Matrix <br />L94105-01 <br />04114125 11:45 <br />04117125 <br />Groundwater <br />Inorganic Prep <br />MethodParameter EPA Dilution Result Qual XQ Units MDL PQL Date Analyst <br />Lab Filtration (0.45um) EPA 200.7/200.8/3005A Filter 04/25/25 13:10 smw <br />& Acidification <br />Metals Analysis <br />MethodParameter EPA <br />Dilution <br />Result <br />Qual XQ Units <br />MDIL�. <br />Boron, dissolved <br />EPA 200.7 <br />1 <br />0.718 <br />mg/L <br />0.03 <br />0.1 <br />04/30/25 18:40 <br />msp <br />Calcium, dissolved <br />EPA 200.7 <br />1 <br />2.57 <br />mg/L <br />0.1 <br />0.5 <br />04/30/25 12:12 <br />msp <br />Magnesium, dissolved <br />EPA 200.7 <br />1 <br />1.73 <br />mg/L <br />0.2 <br />1 <br />04/30/25 12:12 <br />msp <br />Potassium, dissolved <br />EPA 200.7 <br />1 <br />0.93 <br />B mg/L <br />0.5 <br />1 <br />04/30/25 12:12 <br />msp <br />Silica, dissolved <br />EPA 200.7 <br />1 <br />15.0 <br />mg/L <br />0.2 <br />1 <br />04/30/25 18:40 <br />msp <br />Sodium, dissolved <br />EPA 200.7 <br />1 <br />354 <br />mg/L <br />0.2 <br />1 <br />04/30/25 12:12 <br />msp <br />Strontium, dissolved <br />EPA 200.7 <br />1 <br />0.717 <br />mg/L <br />0.009 <br />0.045 <br />04/30/25 12:12 <br />msp <br />Wet Chemistry <br />'Parameter <br />EPA Method Dilution <br />Result <br />Qual <br />Alkalinity as CaCO3 <br />SM 2320 B-2011 <br />Bicarbonate as <br />1 <br />630 <br />mg/L <br />2 <br />20 <br />04/19/25 0:00 <br />asn <br />CaCO3 <br />Carbonate as CaCC3 <br />1 <br />115 <br />mg/L <br />2 <br />20 <br />04/19/25 0:00 <br />asn <br />Hydroxide as CaCO3 <br />1 <br /><2 <br />U <br />mg/L <br />2 <br />20 <br />04/19/25 0:00 <br />asn <br />Total Alkalinity <br />1 <br />745 <br />mg/L <br />2 <br />20 <br />04/19/25 0:00 <br />asn <br />Cation -Anion Balance <br />Calculation <br />Cation -Anion Balance <br />-3.0 <br />% <br />05/02/25 0:00 <br />calc <br />Sum of Anions <br />17 <br />meq/L <br />05/02/25 0:00 <br />calc <br />Sum of Cations <br />16 <br />meq/L <br />05/02/25 0:00 <br />calc <br />Chloride <br />EPA 300.0 <br />10 <br />13.0 <br />B <br />mg/L <br />4 <br />20 <br />04/30/25 17:13 <br />mad <br />Conductivity @25C <br />SM 2510 B-2011 <br />1 <br />1480 <br />umhos/cm <br />1 <br />10 <br />04/28/25 16:12 <br />asn <br />Fluoride <br />EPA 300.0 <br />10 <br />24.0 <br />mg/L <br />0.5 <br />2.5 <br />04/30/25 17:13 <br />mad <br />Hardness as CaCC3 <br />Calculation (SM 2340 B-2011) <br />14 <br />mg/L <br />0.2 <br />5 <br />05/02/25 0:00 <br />calc <br />(dissolved) <br />Lab Filtration (0.45um <br />SOPWC050 <br />1 <br />04/21/25 13:06 <br />cm <br />filter) <br />pH (lab) <br />SM 4500-H+ B-2011 <br />pH <br />1 <br />9.0 <br />H <br />units <br />0.1 <br />0.1 <br />04/19/25 0:00 <br />asn <br />pH measured at <br />1 <br />24.0 <br />C <br />0.1 <br />0.1 <br />04/19/25 0:00 <br />asn <br />Residue, Filterable <br />SM 2540 C-2011 <br />2 <br />832 <br />mg/L <br />40 <br />80 <br />04/19/25 14:39 <br />cob <br />(TDS) @180C <br />Sodium Adsorption <br />USGS - 11738-78 <br />42 <br />05/02/25 0:00 <br />calc <br />Ratio in Water <br />Sulfate <br />EPA 300.0 <br />10 <br /><9 <br />U <br />mg/L <br />9 <br />20 <br />04/30/25 17:13 <br />mad <br />TDS (calculated) <br />Calculation <br />869 <br />mg/L <br />05/02/25 0:00 <br />calc <br />TDS (ratio - <br />Calculation <br />0.96 <br />05/02/25 0:00 <br />talc <br />measured/calculated) <br />Natural Soda LLC <br />Daub & Associates, Inc. Page 56 of 88 2025 2nd Quarter EPA Report <br />