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Town of Mashpee Conservation Commission <br /> 16 Great Neck Road North <br /> Mashpee, MA 02649 <br /> to-one mitigation planting, as required under Regulation 25 for expansion within a flood zone, with the <br /> majority of the work occurring over an existing gravel driveway area. Additional mitigation includes <br /> conversion of lawn areas to native plantings and one-to-one replacement of trees impacted by construction. <br /> Mr. Dib also reviewed flood exceedance projections,noting that the design incorporates a base flood <br /> elevation plus two feet and is intended to accommodate projected 2070 flood conditions. He stated that the <br /> project results in a slight reduction in nitrogen loading due to reduced lawn area and that nitrogen calculations <br /> reflect a decrease from approximately 13 to 12.76, excluding any credit from the septic system component. <br /> Commission members discussed the proposal and mitigation approach. Mr. Colombo inquired whether a <br /> waiver under Regulation 25 was required, to which Mr. Dib responded that no waiver was requested and that <br /> the project was being reviewed on a case-by-case basis with the proposed two-to-one mitigation. <br /> Ms. Pitt asked whether the existing patio would remain as flagstone and questioned the absence of <br /> additional dry wells. Mr. Dib confirmed that one dry well is proposed for the new roof area and that the patio <br /> material could be revised if required by the Commission. <br /> Ms. Godfrey asked whether the patio would be pervious, noting that the existing configuration includes <br /> spacing between stones. <br /> Ms. Thornbrugh raised questions regarding impervious coverage, suggesting consideration of a carport <br /> design to reduce impervious surface and confirming that runoff would be directed to dry wells. She also <br /> commented positively on the mitigation plan but noted the absence of a waiver request for expansion within <br /> the flood zone. It was clarified during discussion that, as a continuance, Ms. Thornbrugh was eligible to vote <br /> on this item. <br /> The Commission discussed potential conditions, including requiring the patio to be constructed of <br /> pervious materials and ensuring that roof runoff is directed to dry wells, with such connections to be clearly <br /> shown on the plans and contained within the limit of work. Staff confirmed that an application had been <br /> submitted to the Zoning Board of Appeals. <br /> MOTION: To close an issue at 168 Whippoorwill Circle with the following conditions: <br /> 1. A two-to-one replacement for trees <br /> 2. Use of pervious materials for the patio <br /> 3. Requirement that all dry wells be connected and reflected on the plans <br /> Motion by: Richard Sahl Seconded bv: Sandi Godfrey <br /> Vote: Motion passed. <br /> Aye: Steve Cook, Sarah Thornbrugh, Sandi Godfrey,Richard Sahl, Seana Pitt <br /> Nay: Paul Colombo (stating that his vote was based on Performance Standard 2C.) <br /> ------------------------------------------------------------------------------------------------------------------------------------------ <br /> NOI 28 Radcliffe Road, Christopher Peckham & Theresa M. Zonfrelli. Proposed construction 43- <br /> of an accessory dwelling unit onto a single-family house. (Representative: Marsh Matters 3407 <br /> Environmental, Inc.) (cont. 3.19) <br /> Mr. Ball presented a revised site plan dated March 26, along with a cover letter and mitigation planting <br /> plan, in response to comments from the prior hearing. He explained that the updated plan includes a one-to- <br /> one mitigation planting ratio after the Commission did not support the prior request for a waiver of mitigation <br /> requirements. He stated that, in his professional opinion, mitigation was not necessary due to the presence of a <br /> 6 <br />