Stage 1 Report
First Quarterly Progress Report
Final Report Page 41 October 2004
Table 21. Other Impairment Causes and Sources in the Impaired Skillet Fork
Waterbody Segments.
Waterbody Cause of
impairments Potential Sources
Skillet Fork (CA 03)
Manganese Natural background sources, oil well brine,
streambank erosion
pH Natural background sources
Dissolved oxygen
Algal respiration, sediment oxygen demand,
degradation of CBOD, nitrification of ammonia
(lesser extent), municipal point sources, failing septic
systems, agricultural runoff, intensive animal feeding
operations
Fecal coliform Municipal point sources, agricultural runoff, failing
septic systems, intensive animal feeding operations
Atrazine Nonirrigated crop production
Skillet Fork (CA 05)
Manganese Natural background sources, oil well brine,
streambank erosion
pH Natural background sources
Dissolved oxygen
Sediment oxygen demand, degradation of CBOD,
municipal point sources, failing septic systems,
agricultural runoff, intensive animal feeding
operations
Atrazine Nonirrigated crop production
Skillet Fork (CA 06)
Manganese Natural background sources, oil well brine,
streambank erosion
pH Natural background sources
Dissolved oxygen
Algal respiration, sediment oxygen demand,
degradation of CBOD, nitrification of ammonia
(lesser extent), municipal point sources, failing septic
systems, agricultural runoff, intensive animal feeding
operations
Atrazine Nonirrigated crop production
Skillet Fork (CA 09)
Dissolved oxygen
Algal respiration, sediment oxygen demand,
degradation of CBOD, nitrification of ammonia,
agricultural runoff, runoff from livestock operations,
failing septic systems (lesser extent)
Horse Creek (CAN 01)
Manganese Natural background sources, oil well brine,
streambank erosion
Dissolved oxygen
Algal respiration, sediment oxygen demand,
degradation of CBOD, nitrification of ammonia, failing
septic systems (lesser extent), agricultural runoff,
municipal point source, intensive animal feeding
operation
