Chapter 10 Erosion and Sedimentary control

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§ 10-20 HAWAII COUNTY CODE Section 10-20. Maximum cleared area. The maximum area of land that may be cleared for grading or grubbing is twenty acres. The area of land that may be cleared may be increased or reduced by the director of public works to control pollution and minimize storm damage. Additional area shall not be cleared for grading or grubbing until measures to prevent dust or erosion problems in the area already graded or grubbed have been completed. (1983 CC, c 10, art 3, sec 10-20; am 2001, ord 01-108, sec 1.) Section 10-21. Fill materials. The fill material may consist of rock, gravel, sand, soil, or a mixture thereof. Except for slopes, the fill shall be compacted to 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. (1983 CC c 10, art 3, sec 10-21; am 2001, ord 01-108, sec 1.) Section 10-22. Preparation of ground surface; vegetation. (a) Before placing fill or stockpiling, the natural ground surface shall be prepared by removing the vegetation 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. (b) Whenever feasible natural vegetation should be retained. 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 within a reasonable time, but not to exceed three months. Exceptions providing for burial in open areas may be allowed as determined by the director of public works. (1983 CC, c 10, art 3, sec 10-22; am 2001, ord 01-108, sec 1.) Section 10-23. Report after grading; notification on completion. (a) When grading involves cuts or fills for which an engineer's soils report is required, the permittee shall submit a report summarizing the construction technique and inspection data as well as a statement regarding conformity to this chapter and the project specifications. 10-12