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The minimum standards of grading and erosion control shall be as follows; however, more stringent standards may be required by the Director of Public Works based on site conditions: 1. Site Grading: Phasing: Site grading shall be phased, as neces- sary, so that each graded area of the construction site has long-term erosion control measures in place within six (6) months of initiating grading for each graded area. The grading and erosion control plans, required in Section 29-33.2 of this Chapter, shall indicate the proposed grading phasing, either by graphic delineation of phasing on the plan or on a key map of the site. The grading and erosion control plans shall provide cut and fill quantities and delineate borrow and stockpile areas. Site Grading and Storm Drainage Control: Lots shall be graded so as to provide positive drainage away from all buildings to be built thereon. Individual lot drainage shall be coordinated with the general storm drainage pattern for the area. Site grading shall be designed so as to substan- tially prevent storm water drainage from one lot to another. Maximum Finished Grade Slopes: No cut or fill shall be made which creates an exposed embank- ment face steeper in slope than three (3) horizon- tal units to one (1) vertical unit. The embanked end of the fill shall be uniformly compacted and stable for the proposed conditions as provided in paragraph e. below. Ifa steeper slope is proposed, its stability shall be certified by a registered soils engineer. Retaining Walls: Retaining walls shall be re- quired wherever necessm3'. to prevent the surface of any excavation or fill from exceeding at any point the maximum allowable slopes as set forth herein and for the preservation of existing signifi- cant trees. Retaining walls shall be constructed with reinforced concrete or interlocking masonry units. Land Development Standards Compaction: All fills shall be compacted to a minimum of ninety percent (90%) compaction as determined by Modified Proctor, ASTM D-1557, unless a lesser percent is approved by the Director of Public Works. Compaction of greater than ninety percent (90%) may be required where special conditions dictate (e.g., large structures or dams). Compaction of fills for buildings or structures shall be certified by a registered engi- neer. The requirements of the Director of Public Works for the compaction of fills shall include, but shall not be limited to, the following: Areas to be graded by cutting or filling shall be rough graded to within two-tenths of a foot of accepted elevation after allowance has been made for thickness of topsoil, paved areas and other installations. (2) The natural ground surface shall be prepared by removing topsoil and vegetation and by compacting the fill upon a series of terraces. HilMde or slope fills shall require plowing or scarification of original ground. (3) If fill material moisture content is below the requirement for compacting to maximum practical density, water in proper amount shall be added. If moisture content is too great, fill material shall be aerated by blading or other satisfactory methods to reduce mois- ture content. (4) Frozen materials, soft, mucky, friable or easily compressible materials shall not be incorporated in fills intended to support buildings, structures, sewers or conduits, or in the embanked ends of fills. After heavy rain, interrupted work shall not be resumed until moisture content is satisfactory. Fill material · shall not be placed, spread or rolled while the ground is frozen or tha;ving. (5) The maMmum thickness of layers of the fill to be compacted shall not exceed eight (8) inches. chapt29.£m 5-8 A~ approved by the Plan Commission on October 22, 1997