Ground-Water Information Center Water Quality Report Site Name: MBMG * LEWIS AND CLARK COUNTY  Report Date: 4/26/2024 Compare to Water Quality Standards Location Information Sample Id/Site Id: 1990Q0287 / 123550 Sample Date: 8/9/1990 10:30:00 AM Location (TRS): 10N 03W 11 DDCC Agency/Sampler: USGS / JPM Latitude/Longitude: 46° 37' 53" N 111° 56' 31" W Field Number: LC-1213 Datum: WGS84 Lab Date: 9/28/1990 Altitude: 3755.346 Lab/Analyst: MBMG / SSH County/State: LEWIS AND CLARK / MT Sample Method/Handling: PUMPED / Site Type: WELL Procedure Type: DISSOLVED Geology: 110ALVM Total Depth (ft): 78 USGS 7.5' Quad: LAKE HELENA 7 1/2 SWL-MP (ft): NR PWS Id: Depth Water Enters (ft): 73 Project: GWAAMON Major Ion Results mg/L meq/L mg/L meq/L Calcium (Ca) 53.510 2.670 Bicarbonate (HCO3) 127.000 2.082 Magnesium (Mg) 11.640 0.958 Carbonate (CO3) 0.000 0.000 Sodium (Na) 16.350 0.711 Chloride (Cl) 6.300 0.178 Potassium (K) 3.220 0.082 Sulfate (SO4) 104.000 2.166 Iron (Fe) <.004 0.000 Nitrate (as N) 1.010 0.072 Manganese (Mn) 0.019 0.001 Fluoride (F) 0.240 0.013 Silica (SiO2) 23.200 Orthophosphate (as P) NR 0.000 Total Cations 4.443 Total Anions 4.510 Trace Element Results (µg/L) Aluminum (Al): 111.000 Cesium (Cs): NR Molybdenum (Mo): <40. Strontium (Sr): 387.000 Antimony (Sb): NR Chromium (Cr): <5. Nickel (Ni): <20. Thallium (Tl): NR Arsenic (As): NR Cobalt (Co): NR Niobium (Nb): NR Thorium (Th): NR Barium (Ba): 41.000 Copper (Cu): <4. Neodymium (Nd): NR Tin (Sn): NR Beryllium (Be): NR Gallium (Ga): NR Palladium (Pd): NR Titanium (Ti): <4. Boron (B): <40. Lanthanum (La): NR Praseodymium (Pr): NR Tungsten (W): NR Bromide (Br): <100. Lead (Pb): NR Rubidium (Rb): NR Uranium (U): NR Cadmium (Cd): <5. Lithium (Li): 11.000 Silver (Ag): <4. Vanadium (V): <4. Cerium (Ce): NR Mercury (Hg): NR Selenium (Se): NR Zinc (Zn): <6. Zirconium (Zr): <6. Field Chemistry and Other Analytical Results **Total Dissolved Solids (mg/L): 280.82 Field Hardness as CaCO3 (mg/L): NR Ammonia (mg/L): NR **Sum of Diss. Constituents (mg/L): 345.26 Hardness as CaCO3: 181.52 T.P. Hydrocarbons (µg/L): NR Field Conductivity (µmhos): 415 Field Alkalinity as CaCO3 (mg/L): NR PCP (µg/L): NR Lab Conductivity (µmhos): 431.1 Alkalinity as CaCO3 (mg/L): 104.16 Phosphorus, TD (mg/L): NR Field pH: 7.07 Ryznar Stability Index: 8.718 Field Nitrate (mg/L): NR Lab pH: 6.69 Sodium Adsorption Ratio: 0.5168 Field Dissolved O2 (mg/L): NR Water Temp (°C): NR Langlier Saturation Index: -1.014 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 Additional Parameters Phosphate T Dis (mg/L - P) L0.1 Notes Sample Condition: CLEAR Field Remarks: SAMPLED AND MEASURED THROUGH SAMPLE CHAMBER * HACH NO3 = 1.5 MG/L * FIELD DO = 5.8 MG/L * Lab Remarks: ALL ANALYSES ARE DISSOLVED UNLESS NOTED OTHERWISE *

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.