Ground-Water Information Center Water Quality Report Site Name: USGS OBSERVATION WELL - PENWELL BRIDGE RD.  Report Date: 4/25/2024 Compare to Water Quality Standards Location Information Sample Id/Site Id: 205049 / 135735 Sample Date: 9/20/2013 12:35:00 PM Location (TRS): 01N 04E 25 DCDD Agency/Sampler: MBMG / MICHALEK, TOM Latitude/Longitude: 45° 48' 8" N 111° 9' 54" W Field Number: 135735 Datum: NAD83 Lab Date: 12/4/2013 7:35:58 AM Altitude: 4389.444 Lab/Analyst: MBMG / TIMMER, JACKIE County/State: GALLATIN / MT Sample Method/Handling: PUMPED / ru:1 ra:0 fu:1 fa:2 Site Type: WELL Procedure Type: DISSOLVED Geology: 110SNGR, 111SNGR Total Depth (ft): 101 USGS 7.5' Quad: BELGRADE SWL-MP (ft): 18.01 PWS Id: Depth Water Enters (ft): 10 Project: GWAAMON, GWCP08, NGWMN-MONTANA,  BWIPMN, GALVAL Major Ion Results mg/L meq/L mg/L meq/L Calcium (Ca) 65.560 3.271 Bicarbonate (HCO3) 264.660 4.338 Magnesium (Mg) 17.390 1.431 Carbonate (CO3) 0.000 0.000 Sodium (Na) 13.240 0.576 Chloride (Cl) 18.300 0.516 Potassium (K) 3.780 0.097 Sulfate (SO4) 22.210 0.463 Iron (Fe) <0.015 U 0.000 Nitrate (as N) 3.790 0.271 Manganese (Mn) <0.002 U 0.000 Fluoride (F) 0.110 0.006 Silica (SiO2) 23.250 Orthophosphate (as P) 0.030 J 0.000 Total Cations 5.383 Total Anions 5.593 Trace Element Results (µg/L) Aluminum (Al): <2.000 U Cesium (Cs): <0.100 U Molybdenum (Mo): 0.560 Strontium (Sr): 233.050 Antimony (Sb): <0.100 U Chromium (Cr): <0.100 U Nickel (Ni): 1.500 Thallium (Tl): <0.100 U Arsenic (As): 1.010 Cobalt (Co): <0.100 U Niobium (Nb): <0.100 U Thorium (Th): <0.100 U Barium (Ba): 160.150 Copper (Cu): 1.980 J Neodymium (Nd): <0.100 U Tin (Sn): <0.100 U Beryllium (Be): <0.100 U Gallium (Ga): <0.100 U Palladium (Pd): 0.210 J Titanium (Ti): 0.280 J Boron (B): 29.550 Lanthanum (La): <0.100 U Praseodymium (Pr): <0.100 U Tungsten (W): <0.100 U Bromide (Br): <10.000 U Lead (Pb): 0.290 J Rubidium (Rb): 1.790 Uranium (U): 1.320 Cadmium (Cd): <0.100 U Lithium (Li): <2.000 U Silver (Ag): <0.100 U Vanadium (V): 1.880 Cerium (Ce): <0.100 U Mercury (Hg): NR Selenium (Se): 0.360 J Zinc (Zn): 3.800 Zirconium (Zr): <0.100 U Field Chemistry and Other Analytical Results **Total Dissolved Solids (mg/L): 297.5 Field Hardness as CaCO3 (mg/L): NR Ammonia (mg/L): NR **Sum of Diss. Constituents (mg/L): 431.95 Hardness as CaCO3: 235.28 T.P. Hydrocarbons (µg/L): NR Field Conductivity (µmhos): 498 Field Alkalinity as CaCO3 (mg/L): NR PCP (µg/L): NR Lab Conductivity (µmhos): 480.61 Alkalinity as CaCO3 (mg/L): 217.35 Phosphorus, TD (mg/L): <0.030 U Field pH: 7.51 Ryznar Stability Index: 7.492 Field Nitrate (mg/L): NR Lab pH: 7.2 Sodium Adsorption Ratio: 0.3688 Field Dissolved O2 (mg/L): NR Water Temp (°C): 12 Langlier Saturation Index: -0.146 Field Chloride (mg/L): NR Air Temp (°C): NR Nitrite (mg/L as N): <0.010 U Field Redox (mV): NR Nitrate + Nitrite (mg/L as N) 3.470 Hydroxide (mg/L as OH): 0.000 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) 3.520 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.