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HomeMy WebLinkAboutFile Documents.614 North St.0248.2017 (26).ARBK 592 Highway 133 • Carbondale, CO 81623 • 970.340.4130 • www.rfeng.biz Storm Water Best Management Practices, Operations and Maintenance Plan 614 W. North Street, Aspen, CO 81611 Description The stormwater installed at 614 W. North Street meets the requirements of The City of Aspen Engineering Department. It is comprised of one system, “Storm System A”, which eventually converge at a single five-foot diameter drywell. This drywell is ten feet deep with five feet of perforations to allow for infiltration below grade. Storm System A surrounds the remodeled structure to collect all impervious areas, as well as any drainage routed towards the structure. Storm System A utilizes downspouts to capture runoff from the roof structure, trench drains to collect runoff from the driveway and impervious patios, and area drains to collect impervious patios and landscaped areas. All collected runoff for Storm System A is routed to Drywell A, which is sized for full detention (see sheet C-103 of the construction documents for the storm system layout). This drywell Is located in the front of the site (southwest corner of the property). Storm System A is entirely designed to capture, convey, and detain runoff for a 100-year storm event. There is no overflow for the drywell, which makes maintenance important for longevity of the drainage system. Drywell The drywell must be inspected and maintained quarterly to remove sediment and debris that has washed into them. Minimum inspection and maintenance requirements include the following: • Inspect drywells at least four times a year and after every storm exceeding 0.5 inches. • Dispose of sediment, debris/trash, and any other waste material removed from a drywell at suitable disposal sites and in compliance with local, State, and Federal waste regulations. • Routinely evaluate the drain-down time of the drywell to ensure the maximum time of 24 hours is not being exceeded. If drain-down times are exceeding the maximum, drain the drywell via pumping and clean out the percolation area (the percolation barrel may be jetted to remove sediment accumulated in perforations. If slow drainage persists, the system may need to be replaced. Trench Drain Trench drains must be regularly inspected and maintained to prevent clogging and debris from travelling further into the system. Routinely keep drain grates and surrounding patios clean and free of leaves, dirt, and other debris. This will prevent clogging and damage to the storm infrastructure. Inspect drain sumps quarterly and after every storm exceeding 0.5 inches, remove excess sediment and debris buildup from the catch basin. Inspect system for damage to the concrete and the grate. Inspect all grouted seams and cracks. If cracks are smaller than ½”, record information and continue inspection regularly. If cracks 614 W. North Street, Aspen, CO 81611 01/15/2020 Page 2 of 2 Roaring Fork Engineering 592 Highway 133, Carbondale, CO 81623 (970) 340-4130 are larger than ½”, regrout and repair to prevent further damage. If grate is damaged, repair or replace as necessary. Pervious Paver Area As per section 8.5.3.1 of the URMP, the following schedule will be undertaken by the owners of the property to achieve long term performance of the BMP’s.