§ 30.52.120. Grading Methodology and Practice.

A.

In addition to the other provisions of the Del Mar Municipal Code, projects located within the Bluff, Slope and Canyon Overlay Zone shall be subject to the following provisions:

1.

All projects involving grading shall be subject to the submittal of an erosion and sedimentation control plan. Said plan shall ensure that the project will not result in an increase in peak runoff from the site over the greatest discharge expected during a 10-year, 6-hour frequency storm. Runoff control shall be accomplished by a variety of measures including, but not limited to, on-site catchment basins, detention basins, siltation traps, energy dissipaters and the installation of landscape material. The required erosion and sedimentation control plan, and any proposals to increase flows, shall be subject to review and approval of the City Engineer.

2.

All erosion control measures shall be subject to detailed maintenance arrangements. Said arrangements shall ensure the on-going repair and maintenance of approved erosion control measures to ensure continued and effective erosion control. The maintenance and repair of such measures shall be the responsibility of the applicant or their successors in interest. The maintenance agreements required herein shall be secured prior to the release of permits and shall be recorded against the deed for the property.

3.

Cut and fill grading shall be designed to either limit runoff to a level which will be equal to or less than the natural flow expected prior to grading or construction activities, or to direct any increased flows to improved drainage facilities and/or natural drainage courses, provided such facilities or drainage courses are of adequate design and capacity to handle all discharge and anticipated flows.

4.

For projects involving a total of more than 25 cubic yards of cut and/or fill grading operations, no grading shall occur November 15th to March 31st of any year.

5.

All permits shall be subject to the submittal of a polluted runoff control plan. The required plan shall incorporate the use of structural and non-structural Best Management Practices (BMPs), to the extent necessary, to minimize the discharge of pollutants carried by runoff from urban development into surface water drainage, and to maintain post-development peak runoff rate and average volume at levels similar to pre-development levels. The plan shall include, but not be limited, to the following Best Management Practices (BMPs), as applicable: silt traps, catch basins, oil/grit separators, street sweeping and cleaning program, low-maintenance landscape and pesticide management plan, solid waste management and public education program. Post-construction structural BMPs (or suites of BMPs) should be designed to treat, infiltrate or filter storm water runoff from each storm, up to and including the 85 ^th percentile, 24-hour storm event for volume-based BMPs, and/or the 85 ^th percentile, one-hour storm event, with an appropriate safety factor, for flow-based BMPs. The plan shall include a monitoring component to ensure long-term maintenance of BMPs as relevant, and to allow for continued evaluation of the effectiveness of the polluted runoff control plan in meeting the goals of the LUP regarding the protection and enhancement of sensitive resources.

(Ord. No. 733)