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<br />m. An analysis of potential debris flow and soil creep shall <br />be inc1uded with any tentative map app1ication. This <br />analysis shall include any appropriate mitigation <br />measures. <br /> <br />n. The depth and areal extant of existing fill, and it's <br />suitability for use as structural fill, shall be <br />evaluated in detail by subsurface exploration and <br />laboratory testing methods. The limits and depth of the <br />fill should be presented in graphical form (e.g. an <br />isopach map) to facilitate identification of this <br />material during mass grading. <br /> <br />o. An analysis on the physical condition (i.e. settlement or <br />collapse potential) of the soils underlying any <br />settlement pond shall be conducted and mitigation <br />measures, if deemed necessary, shall be developed. <br /> <br />16. Differential Fill Settlement <br /> <br />a. Native materials in areas rece1v1ng fills shall be <br />properly stripped and subdrained as directed by the <br />geotechnical engineer. <br /> <br />b. All fills shall be properly keyed, benched, and drained <br />as directed by the geotechnical engineer. <br /> <br />c. In all fill areas greater than 25 feet, special <br />compaction requirements to minimize differential <br />settlement shall be applied by the geotechnical engineer. <br /> <br />d. Prior to placing fills, all highly compressible natural <br />soils shall be removed and replaced with engineered fill. <br /> <br />e Any fills in excess of 25 feet shall be monitored for at <br />least one year, or as recommended by the geotechnical <br />engineer, before construction proceeds on their surfaces. <br /> <br />17. Expansive Soils and Corrosivity <br /> <br />a. Where deemed necessary by the geotechnical engineer, a <br />lined "V" ditch shall be installed at the base of all <br />slopes adjacent to developed areas. <br /> <br />A drainage bench with a lined "V" <br />installed in all cut and fill slopes at <br />intervals on all slopes greater than 30 <br />height. <br /> <br />c. Building pads shall be finish graded with 4% slopes for <br />a minimum of 5 feet away from the building foundations. <br /> <br />b. <br /> <br />ditch shall be <br />25 foot vertical <br />feet in vertical <br /> <br />Resolution No. PC-91-9 <br />February 27, 1991 <br />