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Huddleston•Heny <br />�` f. �.vnkjS 7ev4t. tlC <br />4.6 Drainage <br />In order to improve the long -term performance of the foundations and slabs -on- <br />grade, grading around all of the structures should be designed to carry precipitation and <br />runoff away from the structures. It is recommended that the finished ground surface drop <br />at least two inches within the first ten feet away from the structures where impermeable <br />materials (i.e. sidewalks, pavements, etc.) are adjacent to the structures. Where <br />permeable surfaces are adjacent to the structures, a drop of twelve inches within the first <br />ten feet away from the structures is recommended. Any downspouts should empty <br />beyond the backfill zone. It is recommended that any landscaping within five feet of the <br />structures include primarily desert plants with low water requirements. In addition, it is <br />recommended that automatic irrigation within ten feet of foundations be minimized or <br />controlled with automatic shut off valves <br />4.7 Excavations <br />Excavations in the soils at the site may stand for short periods of time but should <br />not be considered to be stable. The native soils and existing fill materials generally <br />classify as Type C soil with regard to OSHA's Construction Standards for Excavations. <br />In general, for Type C soils, the maximum allowable slope in temporary cuts is 1.5H:1 V. <br />Where competent bedrock is present, such as in the area of the proposed water tanks, <br />vertical temporary cuts may be possible depending on site specific evaluation by the <br />Engineer. <br />5.0 GENERAL <br />The recommendations included above are based upon the results of the subsurface <br />investigation and on our experience. These conclusions and recommendations are valid <br />only for the proposed construction. <br />As discussed previously, the subsurface conditions across the site were variable. <br />Although HBET believes that the investigation was sufficient to generally characterize <br />the range of subsurface conditions in the vicinity of the proposed structures, the precise <br />nature and extent of subsurface variability may not become evident until construction. <br />Therefore, it is recommended that a representative of HBET be retained to provide <br />engineering oversight and construction materials testing services during the foundation <br />and earthwork phases of the construction. This is to verify compliance with the <br />recommendations included in this report or permit identification of significant variations <br />in the subsurface conditions which may require modification of the recommendations. <br />Huddleston -Berry Engineering and Testing, LLC is pleased to be of service to <br />your project. Please contact us if you have any questions or comments regarding the <br />contents of this report. <br />• <br />W A2008 ALL PROJECiS!00456 - River City Contulmms Ine.0356 -0004 New EIL1200 • GWM456 -000! 80824 dm 10 <br />