Section J110 Erosion Control is hereby amended to read as follows:
General—Building and access envelopes shall be delineated on the development plans when necessary to keep disturbance out of particularly erodible areas. Exposed soil shall be protected from erosion by temporary and/or permanent measures. Such protection may consist of mulching, plastic sheeting, and/or vegetation.
Runoff Control—Where concentrated runoff will occur, it will be carried in pipe or culvert conduits or over a non-erodible surface (paved, rocked, or vegetated) to catchment basins clearly shown on the development plan. All conduits must have proper energy dissipaters at the point of discharge when necessary to prevent erosion.
Building Site Runoff—Runoff from the building site shall be controlled by berms, swales, ditches, structures, vegetative filter strips and/or catch-basins to prevent the escape of sediment from the site. At least one percent (1%) grade will be required toward an improved storm drainage or catch-basin facility, either existing or planned.
Runoff Retention—Permanent holding of runoff on the site through percolation to the ground shall be required during and after construction, by the use of catch-basin, retention grading, pavement collection and recharge systems, and/or individual systems for housing units such as drywells or cisterns.
Topsoil—To promote regrowth of vegetation, the topsoil shall be stockpiled and reapplied upon completion of grading on slopes of less than 5:1 (20%).
Soil Placement and Disposal—The placing or disposal of soil, silt or other organic and earthen materials from construction and other soil-disturbance activities at locations above the anticipated high-water line of any stream in the basin where they may be washed into said waters by rainfall or runoff in quantities deleterious to fish, wildlife and other beneficial uses, is prohibited.
Temporary Vegetation—Temporary vegetation sufficient to stabilize the soil as permanent vegetation cover is maturing shall be established on all disturbed areas as needed and as each stage of grading is completed.
Winter Operation—October 15 to April 15. |
(1) | Land disturbance or development operations may be restricted or temporarily halted between October 15 and April 15 (the normal rainy season) and/or other times whenever the city Building inspector determines that the weather, soil, slope and general site conditions may cause serious accelerated erosion or sediment damage either on-site or downstream. When work is allowed, native ground cover shall not be cleared, destroyed, burned, or disturbed more than 15 days prior to grading or construction work unless approved in advance by the city building inspector. |
(2) | When land development work is allowed during the normal rainy season, adequate erosion and sediment control measures including sediment catch-basins must be in place and effective during any land disturbance. |
(3) | All cut and fill slopes without established vegetation between October 15 and April 15 shall be mulched. The mulching shall be anchored by punching or tacking into the soil or by the use of netting. A minimum of 1,000 pounds of straw, or equivalent, per each 10,000 square feet of slope surface will be required to be anchored. An additional amount may be required by the city building inspector. |
(4) | All erosion control plantings and mulching shall be closely monitored throughout the winter and runoff problems corrected promptly. |
Dust—Dust from grading operations must be controlled. The permittee may be required to keep adequate equipment on the grading site to prevent dust problems.
Erosion Control Coordination with Project Installation. |
(1) | All vegetative and/or structural measures required to safely discharge any accelerated run-off generated by the project shall be installed during the first or initial construction phase of the project. |
(2) | Land shall be developed in increments of workable size which can be completed in a single construction season. Erosion and sediment control measures shall be coordinated with a sequence of grading, development and construction operations and all necessary erosion control measures shall be put in effect to the commencement of the next work increment and/or winter rainy season. |
(3) | Prior to completion and final acceptance of the project, all erosion control measures must be in place and all exposed base soil shall be mulched, fertilized and otherwise prepared so that it is planted to a permanent vegetative cover. The city building inspector may require watering of planted areas to initiate and assure growth. |
Existing major Developments—As part of an expansion or intensification of existing major developments, silt and grease traps or sediment catch-basins shall be required.
Maintenance—All on-site erosion control facilities shall be properly maintained by the owners for the life of the project so that they do not become nuisances with stagnant water, heavy algae growth, insect breeding, odors, discarded debris, and/or safety hazards. Vegetative maintenance required may include mowing, fertilization, irrigation and/or reseeding.