2050 Old York Rd Dillsburg, PA 17019-8910

(c) Energy dissipation shall be provided at the outlet of detention basins, along outfall channels, and at the discharge end of all conveyance pipes. (d) Outlet control structures shall be constructed to prevent flota- tion. (e) Outlet control structures s hall be equipped with a childproof, non-clogging, removable, trash rack for all openings larger than 12 inches in diameter. (f) All pipes through earthen em bankments shall be of a type which watertight joint systems are available. Outfall pipes and cul- verts shall be reinforced concrete unless otherwise approved by the Borough Engineer. C. Subsurface Disposal/Retention Basin Systems. (1) General Requirements. Subsurface disposal or surface infiltration of stormwater shall be allowed only where the applicant demonstrates that soils in that area are suitable for such control measures and that there will be no adverse impacts to the environment or adjoining or surrounding properties. Test pits shall be required to establish a soil profile which shall identify any potential limiting zones such as sea- sonal high water table, rock presence , spring activity, sinkholes, etc. Soil testing shall also be performe d to determine permeability or per- colation rates at locations where subsurface facilities are planned. All percolation tests shall be conducte d in accordance with the Pennsyl- vania Department of Environmental Protection, rules and regulations regarding subsurface disposal of wastewater. Tests shall be performed by a representative of the Borough Engineer as directed by the Bor- ough, or an individual certified to perform such tests in which case the tests will be observed by the Boro ugh Engineer. The Borough reserves the right to disallow the use of subs urface disposal or retention basin systems in areas that are deemed to be unsatisfactory. [A.O.] (26, PART 1) 26-27 (2) Design Criteria. Various methods of subsurface disposal may be util- ized, based on the applicability and efficiency of each. Acceptable methods include but are not limited to infiltration trenches, basins, and/or seepage beds and the like. In all instances, the applicant shall provide calculations to verify that facility is sized correctly to control stormwater runoff. Where required by the Borough Engineer infiltra- tion/permeability rates shall be accounted for in the design of subsur- face disposal or retention basins.