Ground-Water Information Center Water Quality Report Site Name: MISSOULA WATER WORKS SYSTEM SAMPLE  Report Date: 4/23/2024 Compare to Water Quality Standards Location Information Sample Id/Site Id: 2001Q0978 / 184328 Sample Date: 11/15/2000 6:10:00 PM Location (TRS): 13N 19W 17 BCAC Agency/Sampler: MBMG / PMN Latitude/Longitude: 46° 53' 13" N 114° 2' 12" W Field Number: PWS0258 Datum: NAD27 Lab Date: 12/7/2000 Altitude: 02580001 Lab/Analyst: MBMG / JMC County/State: MISSOULA / MT Sample Method/Handling: PUMPED / 3120 Site Type: PUBLIC WATER SUPPLY - GW Procedure Type: DISSOLVED Geology: 112ALVM USGS 7.5' Quad: NORTHWEST MISSOULA PWS Id: 02580001 Project: PWSINV Sample Water Use: PUBLIC WATER SUPPLY Major Ion Results mg/L meq/L mg/L meq/L Calcium (Ca) 44.500 2.221 Bicarbonate (HCO3) 190.100 3.116 Magnesium (Mg) 13.200 1.086 Carbonate (CO3) 0.000 0.000 Sodium (Na) 7.120 0.310 Chloride (Cl) 8.750 0.247 Potassium (K) 1.390 0.036 Sulfate (SO4) 15.100 0.315 Iron (Fe) <.005 0.000 Nitrate (as N) 1.240 0.089 Manganese (Mn) <.001 0.000 Fluoride (F) <.05 0.000 Silica (SiO2) 10.800 Orthophosphate (as P) <.05 0.000 Total Cations 3.655 Total Anions 3.766 Trace Element Results (µg/L) Aluminum (Al): <30 Cesium (Cs): NR Molybdenum (Mo): <10 Strontium (Sr): 136.000 Antimony (Sb): <2 Chromium (Cr): 3.380 Nickel (Ni): <2 Thallium (Tl): <5 Arsenic (As): <1 Cobalt (Co): <2 Niobium (Nb): NR Thorium (Th): NR Barium (Ba): 361.000 Copper (Cu): <2 Neodymium (Nd): NR Tin (Sn): NR Beryllium (Be): <2 Gallium (Ga): NR Palladium (Pd): NR Titanium (Ti): <1 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): 4.090 Silver (Ag): <1 Vanadium (V): <5 Cerium (Ce): NR Mercury (Hg): NR Selenium (Se): <1 Zinc (Zn): 5.380 Zirconium (Zr): <2 Field Chemistry and Other Analytical Results **Total Dissolved Solids (mg/L): 195.3 Field Hardness as CaCO3 (mg/L): NR Ammonia (mg/L): NR **Sum of Diss. Constituents (mg/L): 291.71 Hardness as CaCO3: 165.45 T.P. Hydrocarbons (µg/L): NR Field Conductivity (µmhos): 349 Field Alkalinity as CaCO3 (mg/L): NR PCP (µg/L): NR Lab Conductivity (µmhos): 369 Alkalinity as CaCO3 (mg/L): 155.83 Phosphorus, TD (mg/L): <.05 Field pH: 7.7 Ryznar Stability Index: 7.618 Field Nitrate (mg/L): NR Lab pH: 7.7 Sodium Adsorption Ratio: 0.2368 Field Dissolved O2 (mg/L): NR Water Temp (°C): 9.9 Langlier Saturation Index: 0.041 Field Chloride (mg/L): NR Air Temp (°C): -6 Nitrite (mg/L as N): <.05 Field Redox (mV): 22.9 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: SAMPLE FROM PUBLIC WATER SUPPLY M#S 68599 (WEST #2) & 68413 (EAST #1) 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.