Ground-Water Information Center Water Quality Report Site Name: MISSOULA COUNTY WQD WELL W131920C  Report Date: 4/23/2024 Compare to Water Quality Standards Location Information Sample Id/Site Id: 1999Q0850 / 151143 Sample Date: 6/28/1999 9:15:00 AM Location (TRS): 13N 19W 20 CDDA Agency/Sampler: MBMG / JIL Latitude/Longitude: 46° 52' 4" N 114° 1' 48" W Field Number: 151143 Datum: NAD83 Lab Date: 8/24/1999 Altitude: 3162.1 Lab/Analyst: MBMG / BJK County/State: MISSOULA / MT Sample Method/Handling: PUMPED / 4220 Site Type: WELL Procedure Type: DISSOLVED Geology: 111ALVM Total Depth (ft): 45 USGS 7.5' Quad: SOUTHWEST MISSOULA SWL-MP (ft): NR PWS Id: Depth Water Enters (ft): 20 Project: GWAAMON, GWCP04 Major Ion Results mg/L meq/L mg/L meq/L Calcium (Ca) 50.300 2.510 Bicarbonate (HCO3) 192.800 3.160 Magnesium (Mg) 12.500 1.029 Carbonate (CO3) 0.000 0.000 Sodium (Na) 5.990 0.261 Chloride (Cl) 4.216 0.119 Potassium (K) 1.590 0.041 Sulfate (SO4) 17.130 0.357 Iron (Fe) <.005 0.000 Nitrate (as N) 1.02 P 0.073 Manganese (Mn) <.001 0.000 Fluoride (F) 0.130 0.007 Silica (SiO2) 12.700 Orthophosphate (as P) <.05 0.000 Total Cations 3.843 Total Anions 3.715 Trace Element Results (µg/L) Aluminum (Al): <30 Cesium (Cs): NR Molybdenum (Mo): <10 Strontium (Sr): 133.000 Antimony (Sb): <2 Chromium (Cr): <2 Nickel (Ni): <2 Thallium (Tl): <5 Arsenic (As): 1.700 Cobalt (Co): <2 Niobium (Nb): NR Thorium (Th): NR Barium (Ba): 158.000 Copper (Cu): <2 Neodymium (Nd): NR Tin (Sn): NR Beryllium (Be): <2 Gallium (Ga): NR Palladium (Pd): NR Titanium (Ti): <10 Boron (B): <30 Lanthanum (La): NR Praseodymium (Pr): NR Tungsten (W): NR Bromide (Br): <50 Lead (Pb): <2 Rubidium (Rb): NR Uranium (U): NR Cadmium (Cd): <2 Lithium (Li): <50 Silver (Ag): <1 Vanadium (V): <5 Cerium (Ce): NR Mercury (Hg): NR Selenium (Se): <1 Zinc (Zn): <2 Zirconium (Zr): <5 Field Chemistry and Other Analytical Results **Total Dissolved Solids (mg/L): 199.87 Field Hardness as CaCO3 (mg/L): NR Ammonia (mg/L): NR **Sum of Diss. Constituents (mg/L): 297.8 Hardness as CaCO3: 177.05 T.P. Hydrocarbons (µg/L): NR Field Conductivity (µmhos): 250 Field Alkalinity as CaCO3 (mg/L): NR PCP (µg/L): NR Lab Conductivity (µmhos): 315 Alkalinity as CaCO3 (mg/L): 158.29 Phosphorus, TD (mg/L): <.1 Field pH: 7.6 Ryznar Stability Index: 7.628 Field Nitrate (mg/L): NR Lab pH: 7.57 Sodium Adsorption Ratio: 0.1962 Field Dissolved O2 (mg/L): NR Water Temp (°C): 10.3 Langlier Saturation Index: -0.029 Field Chloride (mg/L): NR Air Temp (°C): NR Nitrite (mg/L as N): NR Field Redox (mV): 247 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: CLEAR Field Remarks: 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.