Ground-Water Information Center Water Quality Report Site Name: NORTH DAVIS DUPLEXES PUBLIC WATER SUPPLY SYSTEM SAMPLE  Report Date: 4/15/2024 Compare to Water Quality Standards Location Information Sample Id/Site Id: 2001Q0970 / 184168 Sample Date: 11/1/2000 3:15:00 PM Location (TRS): 13N 19W 20 BBCC Agency/Sampler: MBMG / PMN Latitude/Longitude: 46° 52' 28" N 114° 2' 16" W Field Number: PWS0212 Datum: NAD27 Lab Date: 11/30/2000 Altitude: 02121001 Lab/Analyst: MBMG / JMC County/State: MISSOULA / MT Sample Method/Handling: PUMPED / 3120 Site Type: PUBLIC WATER SUPPLY - GW Procedure Type: DISSOLVED Geology: 110ALVM USGS 7.5' Quad: SOUTHWEST MISSOULA PWS Id: 02121001 Project: PWSINV Sample Water Use: PUBLIC WATER SUPPLY Major Ion Results mg/L meq/L mg/L meq/L Calcium (Ca) 43.900 2.191 Bicarbonate (HCO3) 191.800 3.144 Magnesium (Mg) 12.700 1.045 Carbonate (CO3) 0.000 0.000 Sodium (Na) 5.850 0.254 Chloride (Cl) 2.500 0.071 Potassium (K) 1.730 0.044 Sulfate (SO4) 16.300 0.340 Iron (Fe) 0.026 0.001 Nitrate (as N) 0.552 0.039 Manganese (Mn) 0.003 0.000 Fluoride (F) <.5 0.000 Silica (SiO2) 12.000 Orthophosphate (as P) <.5 0.000 Total Cations 3.539 Total Anions 3.593 Trace Element Results (µg/L) Aluminum (Al): <30 Cesium (Cs): NR Molybdenum (Mo): <10 Strontium (Sr): 161.000 Antimony (Sb): <2 Chromium (Cr): 5.610 Nickel (Ni): <2 Thallium (Tl): <5 Arsenic (As): 1.270 Cobalt (Co): <2 Niobium (Nb): NR Thorium (Th): NR Barium (Ba): 179.000 Copper (Cu): 2.430 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): <500 Lead (Pb): <2 Rubidium (Rb): NR Uranium (U): NR Cadmium (Cd): <2 Lithium (Li): 6.020 Silver (Ag): <1 Vanadium (V): <5 Cerium (Ce): NR Mercury (Hg): NR Selenium (Se): <1 Zinc (Zn): 8.310 Zirconium (Zr): <2 Field Chemistry and Other Analytical Results **Total Dissolved Solids (mg/L): 191.19 Field Hardness as CaCO3 (mg/L): NR Ammonia (mg/L): NR **Sum of Diss. Constituents (mg/L): 288.61 Hardness as CaCO3: 161.89 T.P. Hydrocarbons (µg/L): NR Field Conductivity (µmhos): 752 Field Alkalinity as CaCO3 (mg/L): NR PCP (µg/L): NR Lab Conductivity (µmhos): 348 Alkalinity as CaCO3 (mg/L): 157.47 Phosphorus, TD (mg/L): <.05 Field pH: 7.9 Ryznar Stability Index: 7.801 Field Nitrate (mg/L): NR Lab pH: 7.52 Sodium Adsorption Ratio: 0.2052 Field Dissolved O2 (mg/L): NR Water Temp (°C): 9.2 Langlier Saturation Index: -0.140 Field Chloride (mg/L): NR Air Temp (°C): 6 Nitrite (mg/L as N): <.5 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: SAMPLE FROM SYSTEM SUPPLIED BY 2 WELLS M#S 68925/ 68926 COLIFORM PRESENT 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.