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Name: <br />Date: <br />Page: <br />Corrin Wendell <br />November 19, 2022 <br />4 <br /> <br />Plan/Profile – Sanitary Sewer (C2.3) <br />· No comments <br /> <br /> <br />Plan/Profile – Sanitary Sewer (C2.4) <br />· Is 4’ sump on storm MH #2 required by watershed for pretreatment? If not, I would suggest <br />removing the sump; it is in a location that cannot be accessed for cleaning. Response: We <br />do not believe that this sump is necessary anymore as this structure collects rear yard <br />(grass) and roof run-off and is not discharging to the iron-enhanced sand filter. The sump <br />has been removed. <br />· The sump on storm MH #5 is also inaccessible for routine cleaning. Provide a storm sump <br />manhole just north of CBMH #6 that can be accessed from a parked vactor truck in the roadway. <br />Assume 20’ of horizontal reach from centerline of a vactor truck. Response: An additional storm <br />manhole with sump has been added north of CBMH #6. This should be accessible for vactor <br />trucks. <br />· Flow velocity and erosion is a concern at the flared end entering the iron enhanced filtration <br />basin. Provide high-velocity protection in lieu of typical riprap (flexamat or similar). <br />Response: The riprap has been removed and replaced with ArmorMAX 75 erosion control <br />fabric. <br />· Include 50’ of perforated draintile out of each catch basin to drain the subgrade. Response: Added <br />as requested. <br /> <br />Detail Plates <br />· Provide a detail for the retaining wall within Outlot A. Include approximate geogrid dimensions, <br />railing type, and guardrail information. Response: The retaining wall design is not yet complete. <br /> <br />SWPPP <br />· Provide a plan-view depiction of the erosion control devices and temporary/final <br />stabilization methods. Response: An additional plan sheet (C1.2) has been added to the plan <br />set; this sheet shows the plan-view depiction of erosion control and stabilization methods. <br /> <br />Sincerely, <br />Bolton & Menk, Inc. <br /> <br /> <br />Little Canada City Engineer <br /> <br /> <br />Eric Seaburg, PE