2002-07-03_PERMIT FILE - M2002004 (2)

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?J • TABLE 1 STREAMFLOW DATA FROM AREA GAGING STATIONS Station Average Annual Average Peak Waterbody Location Number Period of Record Flow (cfs) Flow (cfs) Saint Charles Vineland 07108900 1979-2000 38 3538 River Moffat Street, 07099970 1988-2000 686 5126 Arkansas River Pueblo Avondale 07109500 1976-2000 985 7217 TABLE 2 SURFACE WATER QUALITY DATA FROM AREA GAGING STATIONS Total Specific Ammonia Period Dissolved Conductance Nitrite+Nitrate nitrogen Fecal Waterbody Location Station of Solids (NS/cm at 25 NO2-NOs NH3-N Coliform Number Record (TDS) degrees C) dissolved dissolved (cold (mg/L as N) (mg/L as 100 ml-) m /L) N) Saint 1971- 2070 one 1.70 ( Charles Vineland 07108900 2000 2000 (one 1868 sample) sample) NA NA River sample) Moffat 1988- Street 07099970 381 605 0.534 0.039 69 Arkansas , Pueblo 2000 River 1976- Avondale 07109500 2000 550 773 1.64 0.095 2459 Applicable WQ Standard for Saint Charles 500 NA 10 05 0.06 2000 River CDPHE 2002/EPA 2002a . (chronic) Applicable WQ Standard for Arkansas River 500 NA 10.5 0.1 200 CDPHE 2002/EPA 2002a . chronic The TDS concentration measured at Vineland in 1988 exceeded the secondary drinking water standard of 500 mg/L, although this value is generally not in excess of tolerance limits for most agricultural crops or livestock. The nitrite and nitrate concentration was 1.70 mg/L, but only one sample was taken so no water quality conclusions can be drawn from this sample. TDS and specific conductance values measured at Moffat and Avondale support information discussed previously, that TDS and specific conductance levels increase as the Arkansas River flows east of Pueblo. NO2-NO3 values did not exceed the standard at any location reviewed. Ammonia nitrogen (NH3-N) concentration was not available for the Saint Charles River and did meet the standard set for the Arkansas River. Fecal coliform levels exceeded the standard for segment 7 of the Lower Arkansas River at Avondale, but were in compliance with the standard at the Moffat Street gaging station. Fecal coliform levels were not sampled at the Vineland gaging station.