BMP# 1 BMP Description - Scheduling ▪ TYPE OF BMP: PERMANENT TEMPORARY ▪ DEFINITION & PURPOSE Phasing involves developing a schedule that includes the sequencing of construction activities with the implementation of construction site BMPs. The purpose of phasing is to reduce the amount and duration of soil exposed to erosion and to implement and maintain BMPs in coordination with the sequence of construction activities. ▪ CONDITIONS FOR EFFECTIVE USE A schedule of the sequence and timing of construction activities is a requirement for all sites that disturb 1 acre or greater and must be provided in - Sequencing and Estimated Dates of Construction Activities in the Cityís SWPPP template. Projects should be phased when possible to reduce the amount and duration of soil exposed at any one time. The phasing plan should be developed during project design. Disturbed areas in one phase should be stabilized before disturbing subsequent phases. When possible, land disturbance and construction in and around waterways should be scheduled during dry weather. BMP# 2 BMP Description - Dust (Wind Erosion) Control ▪ TYPE OF BMP: PERMANENT TEMPORARY ▪ DEFINITION & PURPOSE Dust control involves prevention of wind erosion of the soil and includes phasing, maintenance of existing vegetation, mulching, watering, and provision of wind barriers, consistently maintaining a minimum moisture content on exposed soil to prevent wind erosion of the soil. ▪ CONDITIONS FOR EFFECTIVE USE Phase work to the extent practical to minimize the amount of area disturbed at one time (see Phasing/Sequencing). Preservation of grass and trees and the use of solid board fences may also serve as wind barriers. For areas not subjected to traffic, vegetation provides the most practical method of dust control and should be established as early as possible. Effectiveness of application of water, adhesives, and chemical treatment depends on soil, temperature, humidity and wind velocity ▪ CONSTRUCTION PROCEDURES Use dust control when clearing and grading activities create blowing dust, especially during periods of dry weather. Water shall be applied by means of pressure-type distributors or pipelines equipped with a spray system or hoses and nozzles that will ensure even distribution. Place barriers at right angles to prevailing wind at intervals of about 10 times their height to control soil blowing. Paved areas that have soil on them from construction sites should be cleaned with street sweeper. Mulching offers a fast and effective means of controlling dust when properly applied. Binders and tackifiers should be used on organic mulches. ▪ MAINTENANCE REQUIREMENTS Check the site regularly and reapply as required.
