HomeMy WebLinkAboutNOI Addendum 7.9.2026939 main street rte 6a yarmouth port mass 02675 July 9, 2026 FROM: down cape engineering, inc civil engineers & land surveyors TRANSMITTAL Heather Cornell hcornell@downcape.com Yarmouth Conservation RE: 4 River Drive, South Yarmouth Notice of Intent -addendum DCE#26-078 Oberton Method of Delivery: Email; In person drop off • NOI narrative-REVISED, 8 copies • Site Plan revised 6-26-2026, 1 stamped, 7 copies CC: File tel. (508) 362-4541 fax (508) 362-9880
NOTICE OF INTENT #4 River Drive, South Yarmouth PROJECT NARRATIVE The applicant is pleased to submit a Notice of Intent application to construct a proposed pool on an existing developed property. The 21,465 s.f. property is improved with an existing 3-bedroom single-family dwelling that was constructed in 1960 according to assessors records. It is bordered by residences and located within a FEMA Zone X 0.2% annual chance flood hazard. All construction associated with the pool will be located within an existing lawn area. The proposed work will be within the inner and outer riparian zones of Bass River and outside the 50' buffer to the Coastal Bank. The resource areas and their associated buffers are plotted on the enclosed Site Plan by Down Cape Engineering. A work limit line of staked silt fence backed by coir logs is proposed downgradient of all proposed work. All work limit lines shall remain in place until all construction is completed and areas are planted and stable. Preconstruction activities will include the installation of erosion control fences as shown on the site plans. A staging area is also proposed in the existing driveway area. Exposed soils will be loamed and seeded within 30 days of completion of the work and final grading work as weather permits. No work will take place within any resource area or within Priority/Estimated Habitat of endangered species. A notice of intent was issued for the construction of an addition and septic system in December of 2021. The mitigation associated with that project was never planted and the property has since changed hands. An expanded mitigation area including what was previously approved is proposed as part of this filing. Coastal Bank (310 CMR 10.30) A Coastal Bank exists at the top of the slope down to Bass River. The Coastal Bank was delineated in accordance with the Wetlands Program Policy 92-1. The proposed pool will be located outside the 50' buffer to the top of the bank. The bank's ability to control floodwaters will not be changed by any of the proposed work. Riverfront Area (310 CMR 10.58) The entire site lies within the Riverfront Resource Area. The edge of the river, 100' Inner and 200' Riparian Zones are all shown on the site plan. The lot and existing dwelling pre-date the Rivers Act (1996). Section 10.58(5) of the Wetland Protection Bylaw allows redevelopment of a previously developed area, provided the proposed work improves existing conditions. There is a proposed increase in hardscape of 270 s.f. including the pool and pool equipment. A 2: 1 mitigation area of 551 s.f. is proposed along the top of the Coastal Bank within existing lawn area to help offset the increase in hardscape. The proposed work will take place within existing developed areas and will have no adverse impacts on the riverfront area. The project will result in 4,054 s.f. of alteration including the existing dwelling, driveway and proposed pool. This alteration is less than the allowed 5,000 s.f. (a) The lot is previously developed, and the proposed work will result in an improvement over the existing conditions. (b) No increase is stormwater runoff is anticipated. - 1 -Down Cape Engineering Inc
(c) The proposed work is further away from the river than existing structures. (d) See (g) (e) See (g) (f) See (g) (g) A 2: 1 mitigation area is proposed in the area of existing lawn. (h) The mitigation area plantings shall be demonstrated to be successful for at least two growing seasons prior to requesting the Certificate of Compliance. Land Subject to Coastal Storm Flowage The site is affected by a 500 year flood zone X and the 100 year flood zone (AE el. 12). No fill is proposed so construction and grading activities will have no effect on the 100 year flood elevation. All construction work and final grading will take place outside of the 100 year flood elevation. Compliance with the MA Wetlands Protection Act and Yarmouth Bylaw Chapter 143 Regulations: The proposed construction activities will not have a deleterious effect upon any wetland values as listed in the Bylaw and Wetlands Protection Act. The proposed pool will be located within existing developed areas. The silt fence will contain all construction activities. The area where the work will take place has a very gentle slope; no erosion is expected. All work takes place above the 100 year flood elevation. The proposed mitigation area will provide an additional buffer to the Coastal Bank and Bass River. All machinery will access the areas of proposed construction through the existing roadway. A silt fence will be installed downgradient of any proposed work. Alternatives Analysis The existing site could remain as is, but the owners would like to construct a pool. Different pool locations were explored but the only other viable spot would be within the 50' buffer to the Coastal Bank behind the existing dwelling. The pool size is relatively small and no patio around the pool is proposed. The proposed wildflower meadow mitigation area will replace existing lawn and provide an additional habitat along the top of the Coastal Bank. - 2 -Down Cape Engineering Inc