Ground-Water Information Center Water Quality Report Site Name: LARSON BILL HWY93N12 Report Date: 4/18/2024 Compare to Water Quality Standards Location Information Sample Id/Site Id: 229539 / 290587 Sample Date: 4/5/2018 3:24:00 PM Location (TRS): 12N 20W 35 CDB Agency/Sampler: MBMG / CARSTARPHEN, CAMELA Latitude/Longitude: 46° 44' 58" N 114° 4' 55" W Field Number: 290587 Datum: NAD83 Lab Date: 4/19/2018 10:50:16 AM Altitude: 3179.532 Lab/Analyst: MBMG / TIMMER, JACKIE County/State: MISSOULA / MT Sample Method/Handling: PUMPED / ru:2 ra:0 fu:1 fa:2 Site Type: WELL Procedure Type: DISSOLVED Geology: 100UDFD Total Depth (ft): 74 USGS 7.5' Quad: FLORENCE SWL-MP (ft): NR PWS Id: Depth Water Enters (ft): 64 Project: BWIPLO, BWIPLOMONGW, BWIPLOLITH,  BWIPLOLITH1, BWIPLOLITHX, BWIPLOLITH2 Major Ion Results mg/L meq/L mg/L meq/L Calcium (Ca) 22.280 1.112 Bicarbonate (HCO3) 105.460 1.728 Magnesium (Mg) 4.880 0.402 Carbonate (CO3) 1.130 0.040 Sodium (Na) 3.950 0.172 Chloride (Cl) 2.460 0.069 Potassium (K) 1.120 0.029 Sulfate (SO4) 4.190 0.087 Iron (Fe) <0.015 U 0.000 Nitrate (as N) 0.060 0.004 Manganese (Mn) <0.002 U 0.000 Fluoride (F) 0.130 0.007 Silica (SiO2) 13.390 Orthophosphate (as P) <0.020 U 0.000 Total Cations 1.715 Total Anions 1.937 Trace Element Results (µg/L) Aluminum (Al): <2.000 U Cesium (Cs): <0.100 U Molybdenum (Mo): 0.550 Strontium (Sr): 36.270 Antimony (Sb): <0.100 U Chromium (Cr): <0.100 U Nickel (Ni): <0.100 U Thallium (Tl): <0.100 U Arsenic (As): <0.100 U Cobalt (Co): <0.100 U Niobium (Nb): <0.100 U Thorium (Th): <0.100 U Barium (Ba): 28.340 Copper (Cu): <0.500 U Neodymium (Nd): <0.100 U Tin (Sn): 6.770 Beryllium (Be): <0.100 U Gallium (Ga): 1.300 Palladium (Pd): <0.100 U Titanium (Ti): <0.100 U Boron (B): 1.290 J Lanthanum (La): <0.100 U Praseodymium (Pr): <0.100 U Tungsten (W): <0.100 U Bromide (Br): <10.000 U Lead (Pb): <0.060 U Rubidium (Rb): 1.070 Uranium (U): <0.100 U Cadmium (Cd): <0.100 U Lithium (Li): <2.000 U Silver (Ag): <0.100 U Vanadium (V): <0.100 U Cerium (Ce): <0.100 U Mercury (Hg): NR Selenium (Se): <0.100 U Zinc (Zn): <0.500 U Zirconium (Zr): <0.100 U Field Chemistry and Other Analytical Results **Total Dissolved Solids (mg/L): 103.88 Field Hardness as CaCO3 (mg/L): NR Ammonia (mg/L): NR **Sum of Diss. Constituents (mg/L): 157.16 Hardness as CaCO3: 75.72 T.P. Hydrocarbons (µg/L): NR Field Conductivity (µmhos): 163.7 Field Alkalinity as CaCO3 (mg/L): NR PCP (µg/L): NR Lab Conductivity (µmhos): 151.57 Alkalinity as CaCO3 (mg/L): 87.79 Phosphorus, TD (mg/L): <0.030 U Field pH: 8.28 Ryznar Stability Index: 8.277 Field Nitrate (mg/L): NR Lab pH: 8.14 Sodium Adsorption Ratio: 0.2 Field Dissolved O2 (mg/L): NR Water Temp (°C): 6.9 Langlier Saturation Index: -0.069 Field Chloride (mg/L): NR Air Temp (°C): NR Nitrite (mg/L as N): <0.010 U Field Redox (mV): NR Nitrate + Nitrite (mg/L as N) <0.200 U Hydroxide (mg/L as OH): 0.000 Lab, Dissolved Organic Carbon (mg/L): NR Total Kjeldahl Nitrogen (mg/L as N) NR Lab, Dissolved Inorganic Carbon (mg/L): NR Lab, Total Organic Carbon (mg/L): NR Total Nitrogen (mg/L as N) NR Acidity to 4.5 (mg/L CaCO3) NR Acidity to 8.3 (mg/L CaCO3) NR As(III) (ug/L) NR As(V) (ug/L) NR Total Susp Solids (mg/L) NR Notes Sample Condition: CLEAR Field Remarks: SAMPLE FROM PORT, AQUIFER TEST PUMPING WELL, STREAM SAMPLED TOO 288424 Lab Remarks:

Explanation: mg/L = milligrams per Liter; µg/L = micrograms per Liter; ft = feet; NR = No Reading in GWIC Qualifiers: J = Estimated quantity above detection limit but below reporting limit; P = Preserved sample; S = Method of standard additions; U = Undetected quantity below detection limit; * = Duplicate analysis not within control limits; ** = Sum of Dissolved Constituents is the sum of major cations (Na, Ca, K, Mg, Mn, Fe) and anions (HCO3, CO3, SO4, Cl, SiO2, NO3, F) in mg/L. Total Dissolved Solids is reported as equivalent weight of evaporation residue. Disclaimer These data represent the contents of the GWIC databases at the Montana Bureau of Mines and Geology at the time and date of the retrieval. The information is considered unpublished and is subject to correction and review on a daily basis. The Bureau warrants the accurate transmission of the data to the original end user. Retransmission of the data to other users is discouraged and the Bureau claims no responsibility if the material is retransmitted.