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<br />i.o Introduction <br /> <br />This report presents the results of the engineering investigation performed for <br />Bridal Veil Construction on the McClure property neaz mile post 94.649 of SH 550. This <br />investigation was performed at the request of Emery Lynn Olin. <br />1.1 Proposed Construction <br />The proposed use of this property will be a gravel mining operation. The area <br />will be benched with bench height at 30 feet maximum at a slope of i :1.5 (H:V). <br />Benches will be reclaimed along property boundaries to a 3:1 slope. <br />2.o Site Inspection <br />The site is tree covered and slopes to the west at an average slope of 24% (4: l ). <br />A drainage channel was observed on the southern property boundary; no water was <br />evident in the channel at the time of inspection. House lots extend completely along the <br />northern boundary (all homes are located at least 50 feet from property boundary). <br />Excavations at the site revealed relatively uniform gravelly sand over the depth of <br />the excavation; furthermore, the excavations did not reveal location of bedrock. <br />g.o Engineering Analysis <br />Using standard information for a uniform gravelly sand, a conservative stability <br />analysis was performed using the criteria established in the reclamation plan shown on <br />map RP-1. Maximum slopes at 3:1 provide a factor of safety (FOS) » 1.5. Bench slopes <br />at 1:1.5 yielded a FOS near 1.3. <br />4.o Engineering Conclusions <br />All slopes that will remain should be monitored over time for any movement and <br />sliding. In the future it maybe necessary to reinforce the bench slopes if the land is <br />proposed for an alternate use; however, the 3:1 reclaimed slopes are stable and any post <br />construction on these slopes should be evaluated then. <br />The new drainage diversion ditch & culvert should be maintained and cleared <br />periodically to prevent overflow of the channel and possible detrimental effects to the <br />reclaimed slopes. <br />In conclusion, the proposed reclamation plan provides stable slopes and prevents <br />possible detrimental effects [o the surrounding properties. Furthermore, the reclamation <br />for each bench should be performed prior to the continuance of mining on the next bench. <br />