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culvert would be the mosC expensive option at the HR-6 outfall point, the quarry operator would not have to construct the roadside swales to handle dzverted runoff, and the operator would have a decreased liability Eor runoff and sedimentation damage at the 94/30-inch culvert resulting fro the diversion of flog from ies historic path. stabiliaatiof the of the natural Swale downstream o£ HR-6 should be the responsibility of the Cedar Heights property owners, as well as the construction of a culvertta) under Cedar Heights Drive. It is reCOmmenfled that a 100-year culvert be conatruated under Cedar Heights Drive at the location of proposed culvert "A" ao as to prevent an overflow at this location, however the ei~e of this culvert would be up t the Cedar Heights property owners. Stabilization of the ~natur Swale can be achieved by the construction of timber checks spec pF!ri~)fitr.;lly along the length of the Swale. The size of t;he 1~. y.~nr metal pipe rulvnrt. under the quarry access road is es~timete at betwe.en•.36- an!i..42,-inches .ZSSUming a headwater to depth ratLu of at least 1.5. Option 7: This option is not leasible based upon the review of the topography of the area. Additionally, Chia option is a plan whir_h would result in the diversion of flow from historic path which is not recommended. conclusions As a result of our review of the information relevant to this project, the following conclusions have been reached: 'T cl) The flow originating from the HR-6 basin is considered to be "historic" in nature and should remain in the natural awale through the Cedar Heights property. t21 options which consifler the diversion of !lows from the historic, path should be avoided because of the potential !or damagr:s resulting from drainage and erosion along the access road, l3).: $t b~,la.?ation of tho natural Swale should be considered by £he Ce ar t~'e~g~i'r8 property owners. The installation of stabilization structures should be phased as the natural swala is impacted over time by the historic runoff from the HR-6 basin. c41 The operator of the quarry should be responsible for removing the existing loose sediments upstream of the access read and stabilizing these same areas so that sediment available for transport to ~.he natural awale is minimized. The stabilization of disturbed areas along the quarry ar..cesa road including the safety berm along the east aide of the access road should be the responsibility of the quarry operator.