Ground-Water Information Center Water Quality Report Site Name: VALLEY GROVE WATER USERS ASSOCIATION PWS SYSTEM SAMPLE  Report Date: 4/26/2024 Compare to Water Quality Standards Location Information Sample Id/Site Id: 2001Q0968 / 184169 Sample Date: 11/2/2000 12:00:00 PM Location (TRS): 12N 20W 27 ABAA Agency/Sampler: MBMG / PMN Latitude/Longitude: 46° 46' 36" N 114° 5' 29" W Field Number: PWS0049 Datum: NAD27 Lab Date: 11/30/2000 Altitude: 00490001 Lab/Analyst: MBMG / JMC County/State: MISSOULA / MT Sample Method/Handling: PUMPED / 3120 Site Type: PUBLIC WATER SUPPLY - GW Procedure Type: DISSOLVED Geology: USGS 7.5' Quad: SOUTHWEST MISSOULA PWS Id: 00490001 Project: PWSINV, BWIPLOLITHX Sample Water Use: PUBLIC WATER SUPPLY Major Ion Results mg/L meq/L mg/L meq/L Calcium (Ca) 45.100 2.250 Bicarbonate (HCO3) 278.600 4.566 Magnesium (Mg) 30.100 2.477 Carbonate (CO3) 0.000 0.000 Sodium (Na) 21.200 0.922 Chloride (Cl) 35.200 0.993 Potassium (K) 2.890 0.074 Sulfate (SO4) 11.000 0.229 Iron (Fe) 0.006 0.000 Nitrate (as N) 3.230 0.231 Manganese (Mn) <.001 0.000 Fluoride (F) <.05 0.000 Silica (SiO2) 14.400 Orthophosphate (as P) <.05 0.000 Total Cations 5.726 Total Anions 6.019 Trace Element Results (µg/L) Aluminum (Al): <30 Cesium (Cs): NR Molybdenum (Mo): <10 Strontium (Sr): 90.780 Antimony (Sb): <2 Chromium (Cr): 6.800 Nickel (Ni): <2 Thallium (Tl): <5 Arsenic (As): <1 Cobalt (Co): <2 Niobium (Nb): NR Thorium (Th): NR Barium (Ba): 266.000 Copper (Cu): <2 Neodymium (Nd): NR Tin (Sn): NR Beryllium (Be): <2 Gallium (Ga): NR Palladium (Pd): NR Titanium (Ti): <1 Boron (B): <30 Lanthanum (La): NR Praseodymium (Pr): NR Tungsten (W): NR Bromide (Br): <50 Lead (Pb): <2 Rubidium (Rb): NR Uranium (U): NR Cadmium (Cd): <2 Lithium (Li): 5.190 Silver (Ag): <1 Vanadium (V): <5 Cerium (Ce): NR Mercury (Hg): NR Selenium (Se): <1 Zinc (Zn): 8.580 Zirconium (Zr): <2 Field Chemistry and Other Analytical Results **Total Dissolved Solids (mg/L): 299.65 Field Hardness as CaCO3 (mg/L): NR Ammonia (mg/L): NR **Sum of Diss. Constituents (mg/L): 441.21 Hardness as CaCO3: 236.51 T.P. Hydrocarbons (µg/L): NR Field Conductivity (µmhos): 553 Field Alkalinity as CaCO3 (mg/L): NR PCP (µg/L): NR Lab Conductivity (µmhos): 565 Alkalinity as CaCO3 (mg/L): 228.83 Phosphorus, TD (mg/L): <.05 Field pH: 7.5 Ryznar Stability Index: 7.253 Field Nitrate (mg/L): NR Lab pH: 7.72 Sodium Adsorption Ratio: 0.5942 Field Dissolved O2 (mg/L): NR Water Temp (°C): 9.4 Langlier Saturation Index: 0.234 Field Chloride (mg/L): NR Air Temp (°C): 8 Nitrite (mg/L as N): <.05 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: SAMPLE FROM SYSTEM SUPPLIED BY 2 WELLS M#S 67401/ 67402 COLIFORM ABSENT 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.