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{ Charles L. Rowley, <br /> Con s ulting Engin eer and Land Surveyor <br /> 5 Carver load Tel:508-295-0545 <br /> PO Box 9 E-mall: -crsr63@comeast.net <br /> West Wareham,Na 02576 <br /> July 25, 2012 <br /> Leon Jacobs: Tribal Administrator <br /> Mashpee Wampanoag Tribe <br /> 483 Great Neck Road <br /> Mashpee, MA 02649 <br /> Re: Affordable Housing Project <br /> 184 Meetinghouse Road <br /> Engineering Movie- of Plans <br /> Clear Mr. Jacobs: <br /> I have received the following documents from Bracken Engineering, Inc. for the purpose of <br /> providing a technical review of the project; <br /> 0 Stormwater Management System and Hydrological Analysis dated July 18, 2012 <br /> 0 A set of 40 scale roadway Construction Plans consisting of 12 sheets dated July 17, 2012 <br /> 0 A Fire Apparatus Turning Movement Ilan for Mashpee Ladder Tourer 356 dated 7/191 2012 <br /> 0 A set of half size Road Layout Plans from the Bureau of Indian Affairs consisting of 10 <br /> sheets <br /> A sot of half size Roadway Construction Plans consisting of 12 shoots datedJuly 17, 2012, <br /> A first review of the documents has been completed. The review has been done as if the <br /> submittal was for a standard subdivision street but with the understanding that no submittal under <br /> MGL Chapter 41 or the Mashpee Planning Board Mules and Regulations is required. However the <br /> Mashpee Rules and Regulations have been referred to for various technical aspects of design and <br /> proposed construction. There the submittals differ from those standards of design or construction, <br /> specific references to the various sections of the Mules and Regulations are provided. <br /> toren'water Management System and Hydro loical Analysis <br /> The analysis for stormwater management was done using standard and accepted <br /> procedures to determine runoff rates and volumes for the existing site and for post construction <br /> conditions. This includes an analysis from the -gear, 10-year, 25-year and 100'-year storm <br /> events. The analysis approach appears to be accurate but needs some adjustment. <br /> The following comments are with respect to the information contained in the report. <br /> I In order for the road system to be considered in compliance with the Mashpee Subdivision <br /> Rules and regulations, the design considerations should comply. This includes the <br /> stormwater analysis. <br /> Section IX(J)( ) of the regulations require that all parts of the stormwater system should be <br /> sized for a minimum 25 year storm. The piping system for the project has been designed for <br /> the 10 year storm event. See pp 4 of the report. <br /> . section JX(J)(g) of the Regulations require test pit logs to be shown on the plans. since this <br /> section of the regulations is for stormwater, this would appy to all stormwater management <br /> areas (SWMA) shorn on the plans. The report (pp 3) suggests that test pits are to be dug at <br /> each of the SWMA at the time of construction. This has been shown to be unacceptable <br /> because of the chance of conditions existing that could alter the design. It is recommended <br /> that at least <br />