Ground-Water Information Center Water Quality Report Site Name: EAST EDGE OF ROCK CREEK * STATION 12  Report Date: 5/5/2024 Compare to Water Quality Standards Location Information Sample Id/Site Id: 1991Q0792 / 124118 Sample Date: 8/14/1991 2:47:00 PM Location (TRS): 04N 14W 06 ADBD Agency/Sampler: USFS / RW Latitude/Longitude: 46° 7' 50" N 113° 22' 50" W Field Number: Datum: NAD27 Lab Date: 10/1/1991 Altitude: Lab/Analyst: MBMG / SFM County/State: GRANITE / MT Sample Method/Handling: GRAB / Site Type: STREAM Procedure Type: DISSOLVED Geology: Staff Gage Reading: NR USGS 7.5' Quad: POTATO LAKES 7 1/2' Stream Stage: LOW FLOW PWS Id: Stream Discharge (cfs): 35  -  ESTIMATED Project: Stream Width (ft): 11  -  ESTIMATED Sample Water Use: UNUSED Sample Depth (ft): 0.5  -  ESTIMATED Major Ion Results mg/L meq/L mg/L meq/L Calcium (Ca) NR 0.000 Bicarbonate (HCO3) NR 0.000 Magnesium (Mg) NR 0.000 Carbonate (CO3) NR 0.000 Sodium (Na) NR 0.000 Chloride (Cl) NR 0.000 Potassium (K) NR 0.000 Sulfate (SO4) NR 0.000 Iron (Fe) NR 0.000 Nitrate (as N) <0.030 0.000 Manganese (Mn) NR 0.000 Fluoride (F) NR 0.000 Silica (SiO2) NR Orthophosphate (as P) <0.050 0.000 Total Cations 0.000 Total Anions 0.000 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): NR 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): NR Field Hardness as CaCO3 (mg/L): NR Ammonia (mg/L): NR **Sum of Diss. Constituents (mg/L): NR Hardness as CaCO3: NR T.P. Hydrocarbons (µg/L): NR Field Conductivity (µmhos): 137 Field Alkalinity as CaCO3 (mg/L): NR PCP (µg/L): NR Lab Conductivity (µmhos): NR Alkalinity as CaCO3 (mg/L): NR Phosphorus, TD (mg/L): NR Field pH: 6.5 Ryznar Stability Index: NR Field Nitrate (mg/L): NR Lab pH: NR Sodium Adsorption Ratio: 0 Field Dissolved O2 (mg/L): NR Water Temp (°C): 18 Langlier Saturation Index: NR Field Chloride (mg/L): NR Air Temp (°C): 32 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 Ammonia Total(mg/L-N) L0.1 Notes Sample Condition: Field Remarks: BELOW RESERVOIR 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.