Ground-Water Information Center Water Quality Report Site Name: THOMPSON HOME  Report Date: 4/26/2024 Compare to Water Quality Standards Location Information Sample Id/Site Id: 1979Q0212 / 5961 Sample Date: 7/27/1978 1:50:00 PM Location (TRS): 12N 20W 12 DAAD Agency/Sampler: USGS / E H Latitude/Longitude: 46° 48' 40" N 114° 2' 42" W Field Number: 13 Datum: NAD27 Lab Date: 8/30/1978 Altitude: 3440 Lab/Analyst: MBMG / FNA County/State: MISSOULA / MT Sample Method/Handling: GRAB / 4234 Site Type: WELL Procedure Type: DISSOLVED Geology: 120SDMS Total Depth (ft): NR USGS 7.5' Quad: SOUTHWEST MISSOULA 7 1/2' SWL-MP (ft): NR PWS Id: Depth Water Enters (ft): NR Project: Major Ion Results mg/L meq/L mg/L meq/L Calcium (Ca) 19.600 0.978 Bicarbonate (HCO3) 112.000 1.836 Magnesium (Mg) 9.700 0.798 Carbonate (CO3) 0.000 0.000 Sodium (Na) 8.600 0.374 Chloride (Cl) 1.600 0.045 Potassium (K) 1.600 0.041 Sulfate (SO4) 10.900 0.227 Iron (Fe) <.01 0.000 Nitrate (as N) 1.581 0.113 Manganese (Mn) <.01 0.000 Fluoride (F) 0.200 0.011 Silica (SiO2) 28.500 Orthophosphate (as P) NR 0.000 Total Cations 2.191 Total Anions 2.231 Trace Element Results (µg/L) Aluminum (Al): NR Cesium (Cs): NR Molybdenum (Mo): NR Strontium (Sr): NR Antimony (Sb): NR Chromium (Cr): NR Nickel (Ni): NR Thallium (Tl): NR Arsenic (As): NR Cobalt (Co): NR Niobium (Nb): NR Thorium (Th): NR Barium (Ba): NR Copper (Cu): NR Neodymium (Nd): NR Tin (Sn): NR Beryllium (Be): NR Gallium (Ga): NR Palladium (Pd): NR Titanium (Ti): NR Boron (B): NR Lanthanum (La): NR Praseodymium (Pr): NR Tungsten (W): NR Bromide (Br): NR Lead (Pb): NR Rubidium (Rb): NR Uranium (U): NR Cadmium (Cd): NR Lithium (Li): 10.000 Silver (Ag): NR Vanadium (V): NR Cerium (Ce): NR Mercury (Hg): NR Selenium (Se): NR Zinc (Zn): NR Zirconium (Zr): NR Field Chemistry and Other Analytical Results **Total Dissolved Solids (mg/L): 139.47 Field Hardness as CaCO3 (mg/L): NR Ammonia (mg/L): NR **Sum of Diss. Constituents (mg/L): 196.3 Hardness as CaCO3: 88.87 T.P. Hydrocarbons (µg/L): NR Field Conductivity (µmhos): NR Field Alkalinity as CaCO3 (mg/L): NR PCP (µg/L): NR Lab Conductivity (µmhos): 218.7 Alkalinity as CaCO3 (mg/L): 91.86 Phosphorus, TD (mg/L): NR Field pH: NR Ryznar Stability Index: 9.469 Field Nitrate (mg/L): NR Lab pH: 7.02 Sodium Adsorption Ratio: 0.4154 Field Dissolved O2 (mg/L): NR Water Temp (°C): 12.5 Langlier Saturation Index: -1.225 Field Chloride (mg/L): NR Air Temp (°C): NR Nitrite (mg/L as N): NR Field Redox (mV): NR Nitrate + Nitrite (mg/L as N) NR Hydroxide (mg/L as OH): NR 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: Field Remarks: MISSOULA 00200 WELL PUMPING Lab Remarks:

Explanation: mg/L = milligrams per Liter; µg/L = micrograms per Liter; ft = feet; NR = No Reading in GWIC Qualifiers: A = Hydride atomic absorption; E = Estimated due to interference; H = Exceeded holding time; J = Estimated quantity above detection limit but below reporting limit; K = Na+K combined; N = Spiked sample recovery not within control limits; 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.