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The following text has been.added to the narrative, "The large infiltration basin, located in the southern <br /> Portion of the site, is equipped with two cells that are separated by a flow control structure. This flow <br /> control structure will be equipped with a concrete weir that has a slot that a'wood barrier could be <br /> tenaporar'ily inslolled to obstruct flow and locally contain the spill within the forebay. Bioreteiition <br /> facilities also fitnction in a-inahner to localize spills to one area dire to their shallow depressions.and the <br /> systerns.not having piped ozrtfalls as a discharge method. Contaminated soil material then can be <br /> excavated and disposed of in an approved offsite location." <br /> 6. It is not clear'where rip rap slope protection is to used and how it will be constructed. <br /> See response to Comment C.3. <br /> 7. Responsible party'for operation and maintenance of drainage system._ <br /> The following text has beeia ridded to the narrative: <br /> ®&M.Pesponsible Party: <br /> Association: <br /> Main Street Village Housing Association <br /> Lettie Lane,Route 130, <br /> Mashpee,NIA 02649 <br /> Association Developed by: <br /> McShane Construction,Inca <br /> P:O:Box 429 <br /> Osterville, Mass. 02655 <br /> 8. Comments on pre to post-development HydroCad'Model. Are building roofs and driveways <br /> included in the impervious area calculations? Are wood clip areas modeled as,such? Surfaces <br /> not covered by forest or grass may increase runoff even further.. <br /> All building roofs and driveways have been.included in the sizing of all drainage structures and have <br /> been modeled as irnper-viorts (CN=98). The site will riot be covered with wood chips as the previozrs <br /> applicatio.72 booklet stated. Rtinoff is increased ftona Pre io Post-development, however the proposed <br /> drainage system provides attenuation a7id trei atrrrent of storrnwater-in accordance with state and local <br /> regulations. <br /> 9. Bioretention systems, rip rap overflow structures and frozen ground conditions. <br /> Me have addressed the IC077cerns of how the bioretention systems and rip rap overflown structures-will <br /> fiinction with the zipdate"d Plan (Plan View—Sheet 5 and Details=.Sheet 6) and the response to Comment, <br /> C3. Al Noretention facilities have,been revised to include an enzergericy overflow systeni that�either <br /> discharges to the large infiltration basin to the.sowh of the parcel or to a "fr ozen ground"overflow <br /> recharge basin, which are located within the biorete.ntion areas. All frozen ground recharge basins are . <br /> sized for the 25-year, 4-hour storm in accordance with Town,regulations.(see Frozen Ground <br /> Conditions Analysis, dated.March 5, 20.04). <br /> Response Letter Horsley Witten Group <br /> Main Street Village (Lettie Lane)Mashpee,MA 3 March 5,2004 <br /> Horsley Witten Group <br />