539 EROSION CONTROL PRINCIPLES: DESIGN

539.1 Erosion and sediment control measures shall be applied to erodible material exposed by any project activity.

539.2 Whenever possible grading will be limited to only those areas which are involved in current construction activities.

539.3 All areas exposed and unprotected shall be protected within a minimum amount of time.

539.4 Adequate erosion control measures shall be in place prior to and during the time of exposure.

539.5 The period of exposure shall not exceed one hundred twenty (120) days.

539.6 Temporary or permanent stabilization shall be installed during or immediately upon completion of rough grading activities.

539.7 In most cases, a combination of limited grading, limited time of exposure, and a judicious selection of erosion control practices will prove to be the most practical solution.

539.8 The maximum area that can be exposed at any one time shall be limited to seven hundred fifty thousand square feet (750,000 ft.²).

539.9 All cut and fill slopes will be protected against stormwater run-off by use of diversions, which will be paved or otherwise protected by vegetation or matting from erodible velocities or volumes. On cut and fill slopes of equal or greater inclination than three horizontal to one vertical (3:1), critical area stabilization methods will be applied. Slopes flatter than 3:1 may require the application of critical area stabilization depending on soil characteristics.

539.10 Cut and fill slopes will be protected in five foot (5 ft.) vertical increments as each increment is completed. When constructed out-of-season for planting, critical area stabilization will be used for protection until permanent protection can be provided.

SOURCE: Final Rulemaking published at 25 DCR 1033 (July 28, 1978), incorporating text of Proposed Rulemaking published at 24 DCR 10522 (June 9, 1978), 8 DCRR, Health Regulations (1965 Edition).

EDITOR'S NOTE: Under the Final Rulemaking published at 25 DCR 1035 (July 28, 1978) the Department of Environmental Services adopted the Handbook for Erosion and Sediment Control (February, 1977). Sections 538 through 545 were published in that Handbook.