§391.APPENDIX F. General Buffer Area, Geological and Topographic Criteria for Sludge Application

 

SLUDGE APPLICATION METHOD
Incorporation or Injection...........................	20 ft. from occupied dwelling. 10 ft. from closet edge of traveled portion of public road or within fence. 200 ft. from surface water.
Ridge and Furrow.......................................	200 ft. from occupied dwelling. 200 ft. from closest edge of traveled portion of public road or within fence. 200 ft. from surface water.
Dewatered material or Splash Plate to Land Surface...............................................	200 ft. from occupied dwelling. 200 ft. from closest edge of traveled portion of primary and secondary public roads; or 10 ft. from closest edge public roads; or within fence. 200 ft. from surface water.
Low Pressure Sprayers (<50 psi (as measured from outer boundary of spray)....................................................	200 ft. from occupied dwelling. 200 ft. from closest edge of traveled portion of public road. 200 ft. from surface water, waterways or flood plains. Wind velocity <15 mph.
High Pressure Sprayers (>50 psi) (as measured from outer boundary of spray)..................................................	1000 ft. from occupied dwelling. 1000 ft. from closest edge of traveled portion of public road. 1000 ft. from surface water, waterways or flood plains. Wind velocity <15 mph.
GEOLOGICAL CONSIDERATIONS
Minimum Depth of Earth Cover to the Mean Annual Water Tale............................	10 ft. with rapid permeability (greater than 2.0 inches/hr) 5 ft. with moderate to slow permeability (less than 2.0 inches/hour)
Distance from Potable Water Well.............	150 ft. in all instances, however, if a water supply is located in a consolidated bedrock (such as limestone) or sinkhole area and is within one-fourth of a mile of the sludge application site, then 50 foot depth of non-sandy, non-gravelly unconsolidated material is needed for water supply protection
TOPOGRAPHIC CONSIDERATIONS
Maximum Slope..........................................	8% (incorporation)*
	5% (surface application)*
Application to Waterways...........................	Not allowed
Application in a flood plain having a flooding frequency more often than once every ten years...........................	Only if approved by Agency after review of project.
*May be exceeded under certain conditions. See discussion in Section 391.404.