BIL 373 Draft 01 2006-2008 - Laserfiche WebLink

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These requirements may be modified by the director of public works when cuts or fills are supported by retaining walls, approved by the director, or when the permittee submits an engineer's soils report stating that the soil conditions will permit a lesser horizontal distance without causing damage or danger to the adjoining property. (b) A retaining wall of six feet and over.or as otherwise provided by the County building code, shall be designed by a professional engineer when deemed necessary by the director of public works. Setback requirements of the County zoning ordinance are referenced herein and the State land use commission and County zoning ordinance and other agencies' requirements on shoreline improvements shall be complied with. Section 10-20. Maximum cleared area. The maximum area of land that may be cleared for grading or grubbing is fifteen acres. Noncontiguous increments may be worked on concurrently provided that no single graded area exceeds fifteen acres. The area of land that may be cleared may be reduced by the director of public works to control pollution and minimize storm damage. However, if soils, hydrologic, climatic and construction conditions warrant, and adequate erosion and sedimentation control measures are taken, the director of public works may authorize additional area to be opened. Additional area shall not be cleared for grading or grubbing until erosion and sedimentation control measures to prevent dust or erosion problems in the area already graded or grubbed have been undertaken incompliance with the requirements of this chapter. Section 10-21. Fill materials. (a) The fill material may consist of rock, gravel, sand, soil, or a mixture thereof. Except for slopes, the fill shall be compacted to minimum ninety percent of maximum density as determined by the ASTM soil compaction test D1557, as amended. The director of public works shall inspect the work and may require adequate inspection and compaction control substantiated by test results by an engineer qualified to prepare an engineer's soils report. These requirements may be modified by the director of public works if the permittee submits an engineer's soils report substantiating with appropriate investigation and analysis that the required ninety percent compaction density may be lowered without causing excessive settlement, creep, or stability problems. (b) Before placing fill or stockpiling, the natural ground surface shall be prepared and, if required by the director of public works, shall be keyed by a series of benches. No fill shall be placed over any water spring, marsh, refuse dump, nor upon a soggy or springy foundation, provided that this requirement may be waived by the director of public works if the permittee submits an engineer's soils report substantiating data regarding the safety of the fill. Hazardous materials shall not be stockpiled. Section 10-22. Vegetation. Whenever feasible, natural vegetation should be retained by becoming part of the erosion control plan during construction or part of the permanent landscaping plan if applicable. If removed, trees, timber, plants, shrubbery, and other vegetation, after being uprooted, displaced, or dislodged from the ground by excavation, clearing, or grubbing, shall not be stored or deposited along the banks of any stream, river, or natural water course. After being uprooted, displaced or dislodged, such vegetation shall be disposed of and removed from the site. -14-