HomeMy WebLinkAboutCover Letter RDADecember 8, 2022
Town of Barnstable Conservation Commission
230 South Street
Hyannis, MA 02601
RE: Request for Determination of Applicability
Storm Water Management Maintenance Plan
Cape Cod Village Condominiums
Assessor Map Number: 352035 - between #301 (35203500N) and #279 (35203500L)
Harbor Point Road, Barnstable MA 02601
Enclosed please find a completed Request for Determination of Applicability (RDA) for a stormwater management maintenance plan for an existing constructed stormwater wetlands system
that has been maximizing the removal of pollutants from stormwater runoff for over 40 years. This stormwater mitigation structure (BMP) resulted from the construction of a DEP approved
Tight Tank wastewater disposal system (approved June 22, 1987) for the Cape Cod Village. During construction of that system there was an inadvertent creation of an approximately 5,800
square foot area with an average2 footdepth below final grade depression basin adjacent to one of the tight tanks.
Due to the existing soil conditions underlying this BMP (HnB-Hinesburg sandy loam, 3 to 8 percent slopes) it self-adjusts seasonally to the groundwater on the site. During the months
of April thru October the BMP is normally dry due to the rapid permeability of the soil and depth to the seasonal high-water table, which is generally more than 6 feet. The structure
performs as a retention/infiltration basin during this period to help attenuate peak stormwater events. In the winter months, November thru March, a perched water table may be above
the substratum which decreases the storage volume for stormwater runoff,but nonetheless still helps buffer or attenuates a peak winter stormwater event. The BMP will help settle out
pollutants before sheet flowing down the adjacent natural swale to the beach.
The removal of pollutants from the area identified on the attached maintenance plan during peak stormwater events has been on-going for over 40 years through wetland vegetation uptake,
evaporation, retention/infiltration and settling. This BMP has performed well but needs a maintenance plan that will conform it with an approved view cut permit (DEP File No. SE3-0346
dated March 19,2002) to assure its continued operation maximizes the removal of pollutants.
Responsible Party for the Site:
Cape Cod Village Condominium Association (CCVA)
President of the Managing Board: Amy Collins, 207 Main Street, Maynard MA 01754
amycollins28@gmail.com
Point of Contact:
Roger W. Bacon, P.E.
281 North Street
Belchertown, MA 01002
(H) 413-256-8988 (C) 413-348-8248
rwbacon1@aol.com
Scope of Request:
Approval of Stormwater Mitigation Maintenance Plan to assure seasonal cleaning of detention/infiltration basin to maximize effectiveness of BMP
Please feel free to contact me with any questions.
Sincerely,
Roger W. Bacon
Roger W. Bacon
Registered Professional Civil Engineer No.31510 Civil