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Project No. 5541 <br />1 June 1993 <br /> <br />The approved form of the development has avoided, for all practical purposes, these <br />identified geological hazards. Only the currently unapproved and open space portions <br />of the project will be, in all likelihood, the subject for extensive mitigation measures, <br />as described below. <br /> <br />The above referenced geologic haTards were identified using the following techniques: <br /> <br />f. <br />g. <br /> <br />h. <br />i. <br /> <br />Review of published geologic maps and literature and unpublished consullants <br />reports. <br />Review of stereo-paired aerial photographs of the disUict and vicinivy. <br />Field reconnaissance, <br />Field mapping. <br />Topographic debris flow h.7~d analysis. <br />Excavation and logging of soil borthgs, backhoe pits and trenches. <br />Surveying of landslide boundaries, identified fault traces and geologic <br />setback zones. <br />Laboratory testing of soil and rock samples from the borings, pits and trenches. <br />Computer modeling of slope stability. <br /> <br />The reports containing the findings of the above studies are referenced in the attached <br />bibliography. These reports include detailed recommendations for mitigating the <br />identified geologic haTards as part of the proposed development in the GHAD. the <br />recommended mitigation measures include: <br /> <br />Repair of landslides by excavation end backfilling with engineered fill, including <br />installation of subsurface drains. <br /> <br />Partial repair of landslides, including: removal of portions of the slide and <br />replacemere with an engineered bum'ess fill; consxruction of a maintenance <br />bench to contain debris; end/or installation of subsurface drains. <br /> <br />Although the above described mitigation measures are designed to miplrniTe the <br />potential impacts of geologic l~a'zards on the GHAD, the potential for future suoh <br />impacts can not be entirely discounted. <br /> <br />Periodic monitoring, maintenence and evaluation of completed mitigation measures will <br />be necessary to help assure proper operation and function. Examples of maintenance <br />functions could include periodic cleaning of debris accumulated in surface drains or <br />deflected by debris deflection bantiers, flushing of subdrain systems and visual <br />reconnaissance of the overall project site. <br /> <br />4 <br /> <br /> <br />