C Minimal Lateral Distances in Feet Between Water Wells, Closed-Loop Wells, and Sources of Contamination

Section 920.Table C   Minimal Lateral Distances in Feet Between Water Wells, Closed-Loop Wells, and Sources of Contamination SOURCES OF CONTAMINATION OR EXISTING WATER WELL MINIMUM LATERAL DISTANCES FOR CLAY AND LOAM SOILS (FEET) WATER WELL CLOSED LOOP WELL Cesspool 150 150 Closed Loop Well 1 200 NA Water Well 1 NA 200 Water Well (when the owner of the closed loop well and a water well serving a private water supply is the same) 1 N/A 75 Leaching Pit 100 100 Pit Privy 75 75 Subsurface Seepage System, Distribution Box, Sand Filter, Waste Stabilization Pond, Effluent Receiving Trench 75 75 Manure Pile 75 75 Septic Tank, Aerobic Treatment Plant, Surface Discharge Effluent Line, Treated Effluent Discharge Point 50 50 Barnyard or Animal Confinement Lot 50 50 Footing Drains (No connection to a sewer or sump handling sewage is allowed.) 10 10 2 Pump House Floor Drain 2 2 2 Pit, Crawl Space or Basement 5 5 2 Lake, Pond or Stream 25 25 3 Potential Primary Source, Potential Secondary Source, or Potential Route 200 200 Potential Primary Source, Potential Secondary Source, or Potential Route (when the owner of the source or route and a water well serving a private water supply or closed loop well is the same) 75 75 Abandoned Wells 200 200 Sewers (Sanitary or Combined) 50 4 50 4,5 Storm Sewers 10 10 6 1 A closed loop well utilizing USP food grade propylene glycol may be located to within 25 feet of a water well. 2 These setbacks do not apply when the closed loop well is installed prior to the construction of the building. 3 The 25-foot separation distance from a pond does not apply to a closed loop well when: 1)    The borehole is grouted the same day that is constructed; 2)    The top 20 feet of the borehole is bored to a diameter at least 3 inches greater than the total diameter of the heat exchanger; and 3)    The enlarged top 20 feet of the borehole is grouted with bentonite chips manufactured for well sealing within 24 hours after the construction of the borehole. 4 A water well or closed loop well may be located to within 10 feet of a sewer provided that the sewer consists of cast iron pipe with watertight mechanical joints or rubber gasket sealed joints that meet ASTM Standard C564-11, SDR 26 PVC pipe or schedule 40 PVC pipe or heavier with solvent welded watertight joints or elastomeric seals (gaskets) used for push-on joints that meet ASTM Standard F477-10. 5 If the sewer pipe material is unknown, the 50-foot separation distance may be reduced to 25 feet if the following conditions are met: 1)    The borehole is grouted the same day that it is constructed; 2)    The top 20 feet of the borehole is bored to a diameter at least 3 inches greater than the total diameter of the heat exchanger; and 3)    The enlarged top 20 feet of the borehole is grouted with bentonite chips manufactured for well sealing within 24 hours after the construction of the borehole. 6 The 10-foot separation distance for a storm sewer does not apply to a closed loop well when: 1)    The borehole is grouted the same day that it is constructed; 2)    The top 20 feet of the borehole is bored to a diameter at least 3 inches greater than the total diameter of the heat exchanger; and 3)    The enlarged top 20 feet of the borehole is grouted with bentonite chips manufactured for well sealing within 24 hours after the construction of the borehole.