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Meetinghouse Hill Plan Review <br /> Page four <br /> discharge at the southwest corner of the property near Meetinghouse Road would <br /> • continue to function as it does now. <br /> The design may be a very conservative approach. It may be possible to meet <br /> the standards for water quality by using deep sump catch basins and the forebay and to <br /> eliminate the precast sediment trap. <br /> It may also be possible to reshape the forebay, provide a curvilinear path for <br /> runoff that will assist in nutrient uptake and to enlarge the detention basin slightly. If the <br /> leaching pit were located at the far end of the detention basin, it may be possible to <br /> eliminate the elaborate discharge pipe, headwall and vertical riser. An emergency <br /> overflow should be included at the point of discharge in the detention area. <br /> It is still recommended that the leaching pit be included with a raised grate. This <br /> will allow the infiltration of runoff within the detention area and reduce the time when the <br /> detention area is flooded, especially when the bottom of the detention area may be <br /> frozen. The detention basin bottom should be given a slight pitch toward the leaching <br /> pit so that water will be directed toward it and will not pond adversely. <br /> The bottom of the detention basin should be dressed with a sandy loam mixture <br /> and with a seed mix that is compatible with this type of use. Grass cover in the bottom <br /> of the basin should be mowed only 2 to 3 times per year and kept at a 4" height. The <br /> sides of the basin should be treated with an ordinary loam and seed mix. <br /> Maintenance <br /> It is recommended that a written maintenance plan be submitted to the Board for <br /> review. A drainage system of this type requires regular inspections and maintenance in <br /> order to be effective. <br /> A maintenance schedule should be proposed for the drainage system. It should <br /> include the schedule for cleaning catch basins, the sediment trap if used, cleaning the <br /> forebay, mowing the detention area, and inspection of the leaching pit. It should also <br /> indicate who is to be responsible for the maintenance of the system over the long term. <br /> Road Construction <br /> It is recommended that road construction should be inspected at appropriate <br /> intervals. This is typically done in stages as follows: <br /> 1. After drainage structures such as catch basins, manholes and pipe have been <br /> installed but before they are backfilled, and including the construction of the <br /> forebay and detention area, <br /> 2. After gravel or other approved road base material has been placed, graded and <br /> rolled but prior to paving, <br /> 3. After road binder has been placed but before the wearing surface is placed, <br /> especially if there is an extended period between the times of placement. <br /> Accumulated sediment and debris must be swept from the binder course and it <br /> should be given a tack coat of asphalt to insure proper blending of the two <br /> courses of mix, <br /> 4. After all other work is completed including loam and seed, street monuments, <br /> and street sign. <br /> Securing Road Construction <br /> It is customary to secure the construction of the road so that adequate lot access <br /> 1S assured. <br /> t?. , A covenant signed by the applicant/owner of the project and the Town of <br /> 4WEp pee that guarantees the full construction of the road and all utilities prior to <br /> 1/�y� t goof lots for conveyance, <br /> d 'V <br /> e p ng of appropriate monetary security with the Town Treasurer in a <br /> Jnt amount to cover all projected road construction costs to the Town of <br /> 01 <br />