Ground-Water Information Center Water Quality Report Site Name: USGS * MERRITT LANE  Report Date: 4/19/2024 Compare to Water Quality Standards Location Information Sample Id/Site Id: 1979Q2990 / 5816 Sample Date: 7/3/1979 Location (TRS): 11N 02W 30 DCAD Agency/Sampler: USGS / Latitude/Longitude: 46° 40' 40" N 111° 53' 58" W Field Number: 4-26 Datum: NAD83 Lab Date: 7/27/1979 Altitude: 3685 Lab/Analyst: MBMG / FNA County/State: LEWIS AND CLARK / MT Sample Method/Handling: GRAB / 4220 Site Type: WELL Procedure Type: DISSOLVED Geology: 110ALVM Total Depth (ft): 45.4 USGS 7.5' Quad: LAKE HELENA 7 1/2' SWL-MP (ft): NR PWS Id: Depth Water Enters (ft): 41 Project: GWAAMON Major Ion Results mg/L meq/L mg/L meq/L Calcium (Ca) 91.400 4.561 Bicarbonate (HCO3) 311.000 5.097 Magnesium (Mg) 8.900 0.732 Carbonate (CO3) 0.000 0.000 Sodium (Na) 27.300 1.188 Chloride (Cl) 11.700 0.330 Potassium (K) 1.000 0.026 Sulfate (SO4) 45.800 0.954 Iron (Fe) 0.020 0.001 Nitrate (as N) 1.717 0.123 Manganese (Mn) 0.030 0.001 Fluoride (F) 0.400 0.021 Silica (SiO2) 41.600 Orthophosphate (as P) NR 0.000 Total Cations 6.508 Total Anions 6.525 Trace Element Results (µg/L) Aluminum (Al): NR Cesium (Cs): NR Molybdenum (Mo): NR Strontium (Sr): NR Antimony (Sb): NR Chromium (Cr): NR Nickel (Ni): NR Thallium (Tl): NR Arsenic (As): NR Cobalt (Co): NR Niobium (Nb): NR Thorium (Th): NR Barium (Ba): NR Copper (Cu): NR Neodymium (Nd): NR Tin (Sn): NR Beryllium (Be): NR Gallium (Ga): NR Palladium (Pd): NR Titanium (Ti): NR Boron (B): NR Lanthanum (La): NR Praseodymium (Pr): NR Tungsten (W): NR Bromide (Br): NR Lead (Pb): NR Rubidium (Rb): NR Uranium (U): NR Cadmium (Cd): NR Lithium (Li): 30.000 Silver (Ag): NR Vanadium (V): NR Cerium (Ce): NR Mercury (Hg): NR Selenium (Se): NR Zinc (Zn): NR Zirconium (Zr): NR Field Chemistry and Other Analytical Results **Total Dissolved Solids (mg/L): 383.5 Field Hardness as CaCO3 (mg/L): NR Ammonia (mg/L): NR **Sum of Diss. Constituents (mg/L): 541.3 Hardness as CaCO3: 264.86 T.P. Hydrocarbons (µg/L): NR Field Conductivity (µmhos): 652 Field Alkalinity as CaCO3 (mg/L): NR PCP (µg/L): NR Lab Conductivity (µmhos): NR Alkalinity as CaCO3 (mg/L): 255.07 Phosphorus, TD (mg/L): NR Field pH: NR Ryznar Stability Index: 6.845 Field Nitrate (mg/L): NR Lab pH: 7.42 Sodium Adsorption Ratio: 0.722 Field Dissolved O2 (mg/L): NR Water Temp (°C): NR Langlier Saturation Index: 0.288 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 Notes Sample Condition: Field Remarks: HELENA VALLEY 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.