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ENGEO <br /> <br />INCORPORATED <br /> <br />recommendations known to the City of Pleasanton permit issuing authority. Homeowners, other <br />agencies or public utility companies requesting review will pay for reasonable services as <br />established by the GHAD. The GHAD also may exercise a public education and awareness <br />function by distributing information regarding landslide or erosion hazards and by encouraging <br />the cooperation of residents as described in Geologic Action Plan Section G, below. <br /> <br />D. GeotechnicaI Techniques for Mitigation of Landslide and Erosion Hazards <br /> <br />Geotechnical techniques for mitigating or repairing landslide or erosion damage include: <br /> <br />1. Elimination of the unstable earth mass. <br /> <br />2. Stabilization (either partial or total) of a landslide by removal and replacement with <br /> compacted drained fill. <br /> <br />3. Construction of structures to retain or divert landslide material or sediment. <br /> <br />4. Construction of erosion control devices such as gabions, riprap, geotextiles, or lined ditches. <br /> <br />5. Placement of drained, engineered buttress fills. <br /> <br />6. Placement of subsurface drainage devices (e.g. underdrains or horizontal drilled drains). <br /> <br />7. Slope correction (e.g. gradient change, biotechnical stabilization, and slope trimming or <br /> contouring). <br /> <br />8. Construction of additional surface ditches and/or detention basins, silt fences, sediment traps, <br /> backfill or erosion channels. <br /> <br />Potential landslide and erosion hazards can be reduced by controlling saturation and water runoff <br />through the maintenance of surface and subsurface drainage systems. This includes maintenance <br />of the concrete-lined V-shaped drainage ditches. <br /> <br />4992.5.001.01 <br />February 28, 2003 11 DRAFT 2 <br /> <br /> <br />