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15 feet Depth 18 samples 25 Well number animal waste aquifer background concentration based bacteria were detected bacterial indicators Bessemer Ditch water biological constituents blue active substances byproducts of human Charles Mesa Chemical and bacterial chemical and biological chemical or biological colonies per 100 concen Concentrations of nitrate decrease the concentrations degradation Depth to water detection limit detergents dissolved organic carbon enriched in nitrate Environmental Protection Agency exceeded the expected expected maximum back expected maximum background ground concentration ground-water quality ground-water samples human practices ig/L indicates that human land surface leach field maximum background concentration maximum contaminant level MCL or MCLG median concentration Mesa during July Mesa ground water methylene blue active mg/L table micrograms per liter milliliters nitrogen number Figure Pueblo Reservoir Samples exceeding saturated septic septic-system effluent subsoil system effluent total coliform bacteria tration U.S. Environmental Protection ug/L unsaturated zone USEPA maximum contaminant water greater water less water table