Ground-Water Information Center Water Quality Report Site Name: MT FWP - SELKIRK FISHING ACCESS - HOMESTEAD WELL  Report Date: 4/23/2024 Compare to Water Quality Standards Location Information Sample Id/Site Id: 2010Q0418 / 184127 Sample Date: 10/21/2009 11:55:00 AM Location (TRS): 08N 12E 09 DBBD Agency/Sampler: MBMG / MASON, DONALD C. Latitude/Longitude: 46° 27' 55" N 110° 13' 34" W Field Number: 184127 Datum: NAD83 Lab Date: 1/20/2010 Altitude: 4645.069 Lab/Analyst: MBMG / SM County/State: WHEATLAND / MT Sample Method/Handling: GRAB / 4230 Site Type: WELL Procedure Type: DISSOLVED Geology: 211CLGT Total Depth (ft): 81.4 USGS 7.5' Quad: TWODOT NORTHWEST SWL-MP (ft): 7.31 PWS Id: Depth Water Enters (ft): NR Project: GWAAMON Major Ion Results mg/L meq/L mg/L meq/L Calcium (Ca) 8.140 0.406 Bicarbonate (HCO3) 337.900 5.538 Magnesium (Mg) 2.470 0.203 Carbonate (CO3) 15.600 0.559 Sodium (Na) 828.000 36.018 Chloride (Cl) 19.430 0.548 Potassium (K) 1.910 0.049 Sulfate (SO4) 1,557.000 32.432 Iron (Fe) 0.091 0.003 Nitrate (as N) <0.5 P 0.000 Manganese (Mn) 0.006 0.000 Fluoride (F) 1.910 0.101 Silica (SiO2) 6.270 Orthophosphate (as P) <1.0 0.000 Total Cations 36.701 Total Anions 39.178 Trace Element Results (µg/L) Aluminum (Al): <75.6 Cesium (Cs): <1.0 Molybdenum (Mo): <1.0 Strontium (Sr): 838.000 Antimony (Sb): <1.0 Chromium (Cr): <1.0 Nickel (Ni): <1.1 Thallium (Tl): <1.0 Arsenic (As): <0.6 Cobalt (Co): <0.6 Niobium (Nb): <1.0 Thorium (Th): <1.0 Barium (Ba): 8.500 Copper (Cu): <3.9 Neodymium (Nd): <1.0 Tin (Sn): <1.0 Beryllium (Be): <1.8 Gallium (Ga): <1.0 Palladium (Pd): <0.6 Titanium (Ti): 16.300 Boron (B): 6.300 Lanthanum (La): <1.0 Praseodymium (Pr): <1.0 Tungsten (W): <1.0 Bromide (Br): <1000 Lead (Pb): <4.0 Rubidium (Rb): 1.670 Uranium (U): <1.0 Cadmium (Cd): <1.0 Lithium (Li): 67.100 Silver (Ag): <1.0 Vanadium (V): <0.8 Cerium (Ce): <1.0 Mercury (Hg): NR Selenium (Se): <1.0 Zinc (Zn): 45.600 Zirconium (Zr): <1.0 Field Chemistry and Other Analytical Results **Total Dissolved Solids (mg/L): 2607.16 Field Hardness as CaCO3 (mg/L): NR Ammonia (mg/L): NR **Sum of Diss. Constituents (mg/L): 2778.66 Hardness as CaCO3: 30.49 T.P. Hydrocarbons (µg/L): NR Field Conductivity (µmhos): 3630 Field Alkalinity as CaCO3 (mg/L): 285 PCP (µg/L): NR Lab Conductivity (µmhos): 3410 Alkalinity as CaCO3 (mg/L): 303.9 Phosphorus, TD (mg/L): <0.301 Field pH: 8.87 Ryznar Stability Index: 7.623 Field Nitrate (mg/L): 0.000 Lab pH: 8.59 Sodium Adsorption Ratio: 65.2482 Field Dissolved O2 (mg/L): 0.500 Water Temp (°C): 9.3 Langlier Saturation Index: 0.483 Field Chloride (mg/L): NR Air Temp (°C): NR Nitrite (mg/L as N): NR Field Redox (mV): -316 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: 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.