Ground-Water Information Center Water Quality Report Site Name: LCWQPD - AIRPORT SOUTH - NORTH WELL  Report Date: 4/19/2024 Compare to Water Quality Standards Location Information Sample Id/Site Id: 2003Q0302 / 191533 Sample Date: 8/19/2002 3:10:00 PM Location (TRS): 10N 03W 28 AAAB Agency/Sampler: MBMG / JPM Latitude/Longitude: 46° 36' 5" N 111° 58' 50" W Field Number: 191533 Datum: WGS84 Lab Date: 11/25/2002 Altitude: 3880.481 Lab/Analyst: MBMG / KTH County/State: LEWIS AND CLARK / MT Sample Method/Handling: PUMPED / 3120 Site Type: WELL Procedure Type: DISSOLVED Geology: 120SDMS Total Depth (ft): 121 USGS 7.5' Quad: EAST HELENA SWL-MP (ft): 21.32 PWS Id: Depth Water Enters (ft): 111 Project: LCWQPD, GWAAMON, COLIPHAGE Major Ion Results mg/L meq/L mg/L meq/L Calcium (Ca) 37.300 1.861 Bicarbonate (HCO3) 197.300 3.234 Magnesium (Mg) 17.500 1.440 Carbonate (CO3) 0.000 0.000 Sodium (Na) 23.300 1.014 Chloride (Cl) 15.400 0.434 Potassium (K) 8.760 0.224 Sulfate (SO4) 53.000 1.104 Iron (Fe) 0.058 0.002 Nitrate (as N) 0.975 0.070 Manganese (Mn) 0.005 0.000 Fluoride (F) 0.231 0.012 Silica (SiO2) 53.600 Orthophosphate (as P) <.05 0.000 Total Cations 4.546 Total Anions 4.854 Trace Element Results (µg/L) Aluminum (Al): <30 Cesium (Cs): NR Molybdenum (Mo): <10 Strontium (Sr): 208.000 Antimony (Sb): <10 Chromium (Cr): <10 Nickel (Ni): 13.100 Thallium (Tl): <20 Arsenic (As): 10.700 Cobalt (Co): <2 Niobium (Nb): NR Thorium (Th): NR Barium (Ba): 49.700 Copper (Cu): <5 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): 117.000 Lead (Pb): <10 Rubidium (Rb): NR Uranium (U): NR Cadmium (Cd): <1 Lithium (Li): 7.450 Silver (Ag): NR Vanadium (V): <10 Cerium (Ce): NR Mercury (Hg): NR Selenium (Se): <15 Zinc (Zn): 6.510 Zirconium (Zr): <2 Field Chemistry and Other Analytical Results **Total Dissolved Solids (mg/L): 306.85 Field Hardness as CaCO3 (mg/L): NR Ammonia (mg/L): NR **Sum of Diss. Constituents (mg/L): 406.81 Hardness as CaCO3: 165.17 T.P. Hydrocarbons (µg/L): NR Field Conductivity (µmhos): 457 Field Alkalinity as CaCO3 (mg/L): NR PCP (µg/L): NR Lab Conductivity (µmhos): 464 Alkalinity as CaCO3 (mg/L): 161.57 Phosphorus, TD (mg/L): <0.05 Field pH: 7.79 Ryznar Stability Index: 7.620 Field Nitrate (mg/L): NR Lab pH: 7.82 Sodium Adsorption Ratio: 0.7787 Field Dissolved O2 (mg/L): NR Water Temp (°C): 17 Langlier Saturation Index: 0.100 Field Chloride (mg/L): NR Air Temp (°C): NR Nitrite (mg/L as N): <.05 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: CLEAR Field Remarks: Lab Remarks:

Explanation: mg/L = milligrams per Liter; µg/L = micrograms per Liter; ft = feet; NR = No Reading in GWIC Qualifiers: J = Estimated quantity above detection limit but below reporting limit; 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.