11/20/2002 PLANNING BOARD Minutes

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Charles L. Rowley &Associates CIVIL ENGINEERS & SURVEYORS SITE EVALUATION LAND SURVEYING SITE DESIGN ENVIRONMENTAL CONSTRUCTION LAYOUT TITLE 5 DESIGN 2229 CRANBERRY HIGHWAY TEL:(506)295-0545 POST OFFICE Box 9 FAx:(508)295-1192 WEST WAREHAM,MA 02576 November 20, 2002 Town of Mashpee Planning Board Town Hall 16 Great Neck Road North Mashpee, MA 02649 Re: Country Club Lane, Definitive Plan Attention: Beverly Kane, Chairman Dear Ms. Kane: I have reviewed drainage calculations and the latest plan revisions of November 15, 2002 and have the following comments: Topographic Plans. Sheets 2 and 3 of 5 The drainage swales that show on the plans as connecting the infiltration areas need to be detailed as to bottom width and side slope. It is essential to show the details for two reasons. 1. To be sure that side slopes will fit the grade along the proposed road shoulder and, 2. Provide a potential contractor with sufficient detail to construct the project in conformance with the plans approved by the Board. Roadway Profile Plans Sheet 1 of 9 1. Isolated leaching basins are shown at stations 2+50 and 10+60 off the road shoulders. The grate elevations are shown only 0.60' and 0.30' below the crown of the road at those locations. This needs review with respect to the proposed swale grades. The concern is for potential flooding of the road surface before they become effective. Sheet 2 of 9 1. The cover over the drainage pipe at station 20+0 is less than 2'. The pipe should be lowered so that there is a minimum of 2' of cover at all locations. 2. At station 12+45 the isolated leaching pit in the shoulder is only 0.80' below the centerline grade of the road at that point. This needs review similar to the two locations on sheet 1. Detail Sheet Refer to letter of October 11, 2002, Item 3c for notes relative to the infiltration swales. These need to be dimensioned for construction purposes. If they are of different width, they need to be appropriately labeled.