3214 BROADWAY BROADWAY KINECT APARTMENTS 2021-08-11

CITY OF EVERETT STORMWATER MANAGEMENT MANUAL Design and installation Specifications See DCSS Drawing#201 for details. Note: the 100 foot minimum length of the entrance shall be reduced to the maximum practicable size when the size or configuration of the site does not allow the full length (100 feet). 1. A separation geotextile shall be placed under the spalls to prevent fine sediment from pumping up into the rock pad. The geotextile shall meet the following standards: a. Grab Tensile Strength(ASTM D4751): 200 psi minimum b. Grab Tensile Elongation (ASTM D4632): 30 percent maximum c. Mullen Burst Strength(ASTM D3786-80a): 400 psi minimum • d. AOS(ASTM D4751): 20 to 45 (U.S. standard sieve size). El 2. Hog fuel (wood-based mulch)may be substituted for or combined with quarry spalls in areas that w will not be used for permanent roads. Hog fuel is generally less effective at stabilizing • construction entrances and should be used only at sites where the amount of traffic is very • limited. Hog fuel is not recommended for entrance stabilization in urban areas. The effectiveness of hog fuel is highly variable and it generally requires more maintenance than 11 quarry spalls. The inspector may at any time require the use of quarry spalls if the hog fuel is not fb preventing sediment from being tracked onto pavement or if the hog fuel is being carried onto . pavement. Hog fuel is prohibited in permanent roadbeds because organics in the subgrade soils cause degradation of the subgrade support over time. a 3. Fencing(see BMP C103)shall be installed as necessary to restrict traffic to the construction • entrance. • 4. Whenever possible, the entrance shall be constructed on a firm, compacted subgrade. This can • substantially increase the effectiveness of the pad and reduce the need for maintenance. • Maintenance Standards • 1. Quarry spalls (or hog fuel)shall be added if the pad is no longer in accordance with the specifications. 2. If the entrance is not preventing sediment from being tracked onto pavement,then alternative - measures to keep the streets free of sediment shall be used. This may include an increase in the S dimensions of the entrance or the installation of a wheel wash. • 3. Any sediment that is tracked onto pavement shall be removed by shoveling or street sweeping. • The sediment collected by sweeping shall be removed or stabilized on site. The pavement shall S not be cleaned by washing down the street,except when sweeping is ineffective and there is a threat to public safety. If it is necessary to wash the streets,the construction of a small sump shall be considered. The sediment would then be washed into the sump where it can be controlled. - 4. Any quarry spalls that are loosened from the pad, which end up on the roadway shall be removed - immediately. 5. If vehicles are entering or exiting the site at points other than the construction entrance(s), fencing (see BMP C103) shall be installed to control traffic. 6. Upon project completion and site stabilization,all construction accesses intended as permanent • access for maintenance shall be permanently stabilized. • 11111 ft Volume II— Construction Stormwater Pollution Prevention - 3-5