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(a) The permittee and the owner shall make adequate provisions to prevent any surface waters from damaging the face of any excavation or fill. All slopes shall be protected from surface water runoff from above by berms, swales or brow ditches unless the County Official determines such berms, swales or brow ditches are unnecessary to provide such protection and waives this requirement.
(b) Where grading operations are to be conducted for any time during the period from November 11 through April 30, the County Official may require the incorporation of additional erosion control measures, including but not limited to the application of geotextile fabrics, erosion control blankets, particularly if slope plantings required by Section 87.418 have not become established.
(c) If any part of grading work on any site is ceased for any reason for a period in excess of 10 calendar days or prior to the onset of precipitation (50% chance of ½ inch or more of rain), the County Official requires that additional stormwater measures be implemented to disturbed soil areas, as required by Section 67.811, in order to prevent damage such as erosion or sedimentation to the site, slopes, adjoining properties, public rights of way or watercourses.
(d) The active disturbed soil area of a project site shall be no more than 50 acres for an individual grading permit/improvement plan or combination of grading permits under associated Tentative or Final Map (i.e. TM XXXX-1 through 3), unless otherwise approved by the County Official. 125% of the required Stormwater BMP materials shall be maintained on site to protect the disturbed soil area.
(Added by Ord. No. 9547 (N.S.), effective 5-9-03; amended by Ord. No. 9926 (N.S.), effective 4-11-08)
All areas designed for buildings shall be graded to provide at least one percent grade toward the approved disposal area unless waived by the County Official where the terrain is so flat as to make such grade unnecessary or impractical.
(Added by Ord. No. 9547 (N.S.), effective 5-9-03)
(a) All berms, swales and brow ditches shall be designed and constructed, and when required, shall be paved or otherwise improved to the satisfaction of the County Official.
(b) Except as otherwise provided in Section 87.402, all swales and ditches shall have a minimum grade of two percent, a minimum depth of one foot and shall be paved for a width of at least three feet with a minimum thickness of three inches of portland cement concrete or two inches of pneumatically applied concrete mortar or shall be improved with other material or by other treatment approved by the County Official as equal. The paving of such swales or ditches may be waived by the County Official after receipt of a report by a soil engineer certifying that in the engineer's opinion the paving is unnecessary.
(c) If the drainage discharges onto natural ground, the County Official shall require that such natural ground be protected from erosion.
(Added by Ord. No. 9547 (N.S.), effective 5-9-03)
(a) General. The face of all cut and fill slopes, in excess of 3 feet in vertical height, but only final slopes of any borrow pit, shall be planted and maintained with a ground cover or other planting to protect the slopes against erosion and instability. Planting shall commence as soon as slopes are completed on any portion of the site and shall be established upon all slopes prior to the final approval of the grading. In order to minimize the period during which a cut or filled surface remains exposed, such planting shall provide for rapid short term coverage of the slope as well as long term permanent coverage. Planting materials and procedures shall conform to regulations adopted by the County Official. Other plant materials as specified by a landscape architect may be approved by the County Official. The permittee shall maintain such planting until it is well established as determined by the County Official, and at least until coverage of 70%, as compared to the native background plants, is achieved.
(b) Minimum Requirements. In addition to planting with ground cover, slopes in excess of fifteen feet in vertical height shall be planted with shrubs having a one gallon minimum size or trees having a five gallon minimum size. The maximum spacing for shrubs and trees shall be ten feet on center each way. The planting pattern, but not the minimum quantity, may be varied upon the recommendation of landscape architect and approval by the County Official.
(Added by Ord. No. 9547 (N.S.), effective 5-9-03)
(a) General. Except for agricultural grading permits and borrow pits, all slopes to be constructed shall be provided with an irrigation system which shall be used to promote the growth of the slope plantings to protect the slopes against erosion. Slopes for borrow pits shall be planted in accordance with the requirements of the applicable use permit and reclamation plan under Chapter 7 of this Division. The owner shall be responsible for installation and maintenance of the irrigation.
(b) Minimum Requirements.
(1) Plans for the irrigation system shall be in accordance with County of San Diego Standard Specifications for Sprinkler Irrigation Systems and shall be approved by the County Official prior to installation.
(2) The irrigation system shall be located relative to existing and proposed property lines to insure that the irrigation system and the slopes sprinkled thereby will both be within the same property boundaries. The irrigation system shall be supplied or be readily converted so as to be supplied through the metered water service line serving each individual property.
(3) The irrigation system shall provide uniform coverage for the slope area at a precipitation rate not exceeding the intake rate of the soil. A functional test of the irrigation systems shall be performed to the satisfaction of the County Official prior to final approval of the rough grading.
(4) Check valves shall be installed in the irrigation system to prevent erosion from low sprinkler heads.
(5) Adequate back flow protection devices shall be installed in each irrigation system. Such devices shall be protected against physical damage during construction operations.
(Added by Ord. No. 9547 (N.S.), effective 5-9-03)
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