Ground-Water Information Center Water Quality Report Site Name: LCWQPD - AIRPORT NORTH - NORTH WELL  Report Date: 4/20/2024 Compare to Water Quality Standards Location Information Sample Id/Site Id: 2003Q0365 / 191538 Sample Date: 8/22/2002 2:50:00 PM Location (TRS): 10N 03W 21 AAAB Agency/Sampler: MBMG / JPM Latitude/Longitude: 46° 36' 56" N 111° 58' 54" W Field Number: 191538 Datum: WGS84 Lab Date: 12/23/2002 Altitude: 3782.85 Lab/Analyst: MBMG / KTH County/State: LEWIS AND CLARK / MT Sample Method/Handling: PUMPED / 3120 Site Type: WELL Procedure Type: DISSOLVED Geology: 110ALVM Total Depth (ft): 80 USGS 7.5' Quad: EAST HELENA SWL-MP (ft): 22 PWS Id: Depth Water Enters (ft): 66 Project: LCWQPD, GWAAMON, COLIPHAGE Major Ion Results mg/L meq/L mg/L meq/L Calcium (Ca) 30.300 1.512 Bicarbonate (HCO3) 178.120 2.919 Magnesium (Mg) 19.300 1.588 Carbonate (CO3) 0.000 0.000 Sodium (Na) 23.700 1.031 Chloride (Cl) 16.100 0.454 Potassium (K) 4.610 0.118 Sulfate (SO4) 46.300 0.964 Iron (Fe) 0.011 0.000 Nitrate (as N) 0.240 0.017 Manganese (Mn) <0.001 0.000 Fluoride (F) 0.990 0.052 Silica (SiO2) 29.500 Orthophosphate (as P) <.05 0.000 Total Cations 4.264 Total Anions 4.407 Trace Element Results (µg/L) Aluminum (Al): <30 Cesium (Cs): NR Molybdenum (Mo): <10 Strontium (Sr): 286.000 Antimony (Sb): <10 Chromium (Cr): <10 Nickel (Ni): <2 Thallium (Tl): <20 Arsenic (As): <10 Cobalt (Co): <2 Niobium (Nb): NR Thorium (Th): NR Barium (Ba): 26.200 Copper (Cu): <5 Neodymium (Nd): NR Tin (Sn): NR Beryllium (Be): <2 Gallium (Ga): NR Palladium (Pd): NR Titanium (Ti): <1 Boron (B): 89.700 Lanthanum (La): NR Praseodymium (Pr): NR Tungsten (W): NR Bromide (Br): <50 Lead (Pb): <10 Rubidium (Rb): NR Uranium (U): NR Cadmium (Cd): <1 Lithium (Li): 52.500 Silver (Ag): NR Vanadium (V): 10.100 Cerium (Ce): NR Mercury (Hg): NR Selenium (Se): <15 Zinc (Zn): <2 Zirconium (Zr): <2 Field Chemistry and Other Analytical Results **Total Dissolved Solids (mg/L): 259.28 Field Hardness as CaCO3 (mg/L): NR Ammonia (mg/L): NR **Sum of Diss. Constituents (mg/L): 349.6 Hardness as CaCO3: 155.1 T.P. Hydrocarbons (µg/L): NR Field Conductivity (µmhos): 384 Field Alkalinity as CaCO3 (mg/L): NR PCP (µg/L): NR Lab Conductivity (µmhos): 424 Alkalinity as CaCO3 (mg/L): 145.99 Phosphorus, TD (mg/L): <0.05 Field pH: 7.53 Ryznar Stability Index: 7.948 Field Nitrate (mg/L): NR Lab pH: 7.76 Sodium Adsorption Ratio: 0.8385 Field Dissolved O2 (mg/L): NR Water Temp (°C): NR Langlier Saturation Index: -0.094 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.