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Appendix D Page D-9 <br /> Standard Specifications for Grading <br /> Roof, pad and slope drainage should be directed away from slopes and areas of structures to <br /> suitable disposal areas via non-erodible devices (i.e., gutters, downspouts, and concrete swales). <br /> For drainage in extensively landscaped areas near structures, (i.e., within four feet) a minimum <br /> of 5 percent gradient away from the structure should be maintained. Pad drainage of at least 2 <br /> percent should be maintained over the remainder of the site. <br /> Drainage patterns established at the time of fine grading should be maintained throughout the life <br /> of the project. Property owners should be made aware that altering drainage patterns could be <br /> detrimental to slope stability and foundation performance. <br /> Section 10 - Slope Maintenance <br /> 10.1 - Landscape Plants <br /> To enhance surficial slope stability, slope planting should be accomplished at the <br /> completion of grading. Slope planting should consist of deep-rooting vegetation <br /> requiring little watering. Plants native to the southern California area and plants relative <br /> to native plants are generally desirable. Plants native to other semi-arid and and areas <br /> may also be appropriate. A Landscape Architect should be the best party to consult <br /> regarding actual types of plants and planting configuration. <br /> 10.2 - Irriization <br /> Irrigation pipes should be anchored to slope faces, not placed in trenches excavated into <br /> slope faces. <br /> Slope irrigation should be minimized. If automatic timing devices are utilized on <br /> irrigation systems, provisions should be made for interrupting normal irrigation during <br /> periods of rainfall. <br /> 10.3 -Repair <br /> As a precautionary measure, plastic sheeting should be readily available, or kept on hand, <br /> to protect all slope areas from saturation by periods of heavy or prolonged rainfall. This <br /> measure is strongly recommended, beginning with the period prior to landscape planting. <br /> If slope failures occur, the geotechnical consultant should be contacted for a field review <br /> of site conditions and development of recommendations for evaluation and repair. <br /> If slope failures occur as a result of exposure to period of heavy rainfall, the failure areas <br /> and currently unaffected areas should be covered with plastic sheeting to protect against <br /> additional saturation. <br /> STANDARD SPECIFICATIONS OF GRADING <br /> Page 9 of 26 <br />