TABLE 3-20. 



CATEGORIES AND SUBCATEGORIES OF NONPOINT SOURCE POLLUTION 



Agriculture 



Nonirrigated crop production 

 Irrigated crop production 

 Specialty crop production 



(e.g., truck farming and orchards) 

 Pasture land (grazing) 

 Feedlots (all types) 

 Aquaculture 



Animal holding/management areas 

 Rangeland (grazing) 

 Streambank erosion 



Resource Ex traction/Expl oration/Development 



Surface mining 

 Subsurface raining 

 Placer mining 

 Dredge mining 

 Petroleum activities 

 Sme 1 1 i ng 

 Mill tailings 

 Streambank erosion 



Land Disposal (runof f/leachate from permitted areas) 



Si Iviculture 



Forest management (harvesting, 

 reforestation, residue management) 

 Road construction/maintenance 



Construction 



H i ghway/ road/br i dge 

 Land development 

 Streambank erosion 



Urban Runoff 



Storm seuers 

 Combined sewers 

 Surface runoff 

 Streambank erosion 



Sludge 



Wastewater 



Landf i Us 



Industrial land treatment 



On-site wastewater systems (septic tanks, etc.) 



Hazardous waste 



Hydromodi f i cat i on 



Channel izat ion 



Dredging 



Dam construction/operation ■.«..- 



Flow regulation/modification 



Streambank erosion 



Removal of riparian vegetation 



Bridge construction 



Streambank modi fi cat ion/destabi I izat ion 



Other 



Atmospheric deposition 



Waste storage/storage tank leaks 



Highway maintenance and runoff 



Spi Us 



Natural 



Source: DHES 1988c. 



3-94 



