Ground-Water Information Center Water Quality Report Site Name: MISSOULA COUNTY WQD WELL U131921A  Report Date: 4/29/2024 Compare to Water Quality Standards Location Information Sample Id/Site Id: 1999Q0841 / 69055 Sample Date: 6/22/1999 Location (TRS): 13N 19W 21 ADBC Agency/Sampler: MBMG / JIL Latitude/Longitude: 46° 52' 24" N 114° 0' 8" W Field Number: CLARKFO Datum: NAD27 Lab Date: 8/4/1999 Altitude: 3176.99 Lab/Analyst: MBMG / BJK County/State: MISSOULA / MT Sample Method/Handling: GRAB / 4220 Site Type: WELL Procedure Type: DISSOLVED Geology: 112ALVM Total Depth (ft): 57 USGS 7.5' Quad: SOUTHWEST MISSOULA SWL-MP (ft): 25.43 PWS Id: Depth Water Enters (ft): 28 Project: GWCP04 Major Ion Results mg/L meq/L mg/L meq/L Calcium (Ca) 20.700 1.033 Bicarbonate (HCO3) 94.200 1.544 Magnesium (Mg) 6.140 0.505 Carbonate (CO3) 0.000 0.000 Sodium (Na) 2.810 0.122 Chloride (Cl) 0.830 0.023 Potassium (K) 1.020 0.026 Sulfate (SO4) 9.250 0.193 Iron (Fe) 0.015 0.001 Nitrate (as N) <.5 P 0.000 Manganese (Mn) 0.004 0.000 Fluoride (F) 0.083 0.004 Silica (SiO2) 9.440 Orthophosphate (as P) <.05 0.000 Total Cations 1.689 Total Anions 1.764 Trace Element Results (µg/L) Aluminum (Al): <30 Cesium (Cs): NR Molybdenum (Mo): <10 Strontium (Sr): 67.400 Antimony (Sb): <2 Chromium (Cr): <2 Nickel (Ni): <2 Thallium (Tl): <5 Arsenic (As): 2.700 Cobalt (Co): <2 Niobium (Nb): NR Thorium (Th): NR Barium (Ba): 102.000 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): 3.340 Zirconium (Zr): <5 Field Chemistry and Other Analytical Results **Total Dissolved Solids (mg/L): 96.15 Field Hardness as CaCO3 (mg/L): NR Ammonia (mg/L): NR **Sum of Diss. Constituents (mg/L): 143.84 Hardness as CaCO3: 76.96 T.P. Hydrocarbons (µg/L): NR Field Conductivity (µmhos): 246 Field Alkalinity as CaCO3 (mg/L): NR PCP (µg/L): NR Lab Conductivity (µmhos): 175 Alkalinity as CaCO3 (mg/L): 77.1 Phosphorus, TD (mg/L): <.1 Field pH: 7.3 Ryznar Stability Index: 8.554 Field Nitrate (mg/L): NR Lab pH: 8.04 Sodium Adsorption Ratio: 0.1488 Field Dissolved O2 (mg/L): NR Water Temp (°C): NR Langlier Saturation Index: -0.257 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: 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.