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<br />The sides <br />riprap or <br />soils. <br /> <br />of the trickle channel should be protected by <br />some other means to prevent erosion of the exposed <br /> <br />Site Grading: We observed no signs of major slope <br />instability during our field investigation. Natural <br />hillsides in the area appear to have a stable geologic <br />history. Major stability problems are not anticipated if <br />site grading is carefully planned and cuts and fills do not <br />excess approximately 15 feet in height. <br /> <br />Permanent unretained cuts in the overburden soils and <br />bedrock less than 15 feet in height may be 3 horizonta: to 1 <br />vertical. The risk of slope instability wil: be <br />significantly increased if seepage is encountered in cuts. <br /> <br />Good surface drainage <br />permanent cuts to direct <br />face. Cut slopes and <br />protected against erosion <br /> <br />should be provided around all <br />surface runoff away from the cut <br />other stripped areas should be <br />by revegetation or other methods. <br /> <br />Fills up to 15 feet in height can be used if the fill slopes <br />do not exceed 3 horizontal to 1 vertical and the fills are <br />properly compacted and drained. The ground surface <br />underlying all fills should be carefully prepared by <br />removing all organic,matter, scarification to a depth of 8 <br />inches and recompacting to' 95% of the maximum standard <br />Proctor density prior to fill placement. All fill should be <br />placed under controlled conditions and compacted to,at least <br />95% of the standard Proctor density. The onsite soils <br />exclusive of the organic material are suitable for reuse as <br />backfill material. The materials encountered in our <br />investigation appeared to be over the optimum moisture <br />content and will have to be dried out prior to compacting <br />them. <br /> <br />In our opinion, excavation of the near surface bedrock and <br />overburden soils should be possible with heavy duty <br />conventional excavation eqUipment. <br /> <br />L.1Jn.itations: This report has been prepared in accordance <br />with generally accepted soil and foundation engineering <br />practices in this area for use by the client for design <br />purposes. The conclusions and recommendations submitted in <br />this report are based upon the data obtained from the <br />exploratory holes drilled at the locations indicated on the <br />exploratory hole plan. The nature and extent of variations <br />between the exploratory holes may not become evident until <br />excavation is performed. If during construction, solI, rock <br />and groundwater conditions appear to be different from those <br />described herein, this office should be advised at one so <br /> <br />5 <br />