SU0004098 - Laserfiche WebLink

Home Browse Search

KLEINFELDER natural cementation of the remolded soils, the reclaimed slopes were analyzed for circular i • failures. The results of these analyses are presented in the appendix. i The effect of earthquake-induced ground shaking on the slopes was evaluated by applying a pseudo-static seismic load. Based on the proximity of the nearest faults and estimates of maximum probable earthquakes, it is our opinion that a 0.15g design acceleration value is appropriate for this study. As noted on the plates in the appendix, the computed minimum factors of safety for the quarry excavation were 1.5 and 1.2 for static and pseudo-static conditions, respectively. The computed minimum static and pseudo-static factors of safety for the reclaimed slopes were 1.8 and 1.3, respectively. These values meet or exceed the criteria normally used by our industry as established by the Army Corps of Engineers, the Federal Emergency Management Agency, Caltrans, and the State-of-Califomia Department-of-Water-Resources Division of Safety of Dams. For this reason, it is our professional opinion that the proposed excavation may be constructed as planned. 7. CONSTRUCTION SITE SAFETY ` Construction site safety generally is the sole responsibility of the Contractor, who shall also be solely responsible for the means, methods, and sequencing of construction operations. The Contractor should be aware that slope height and slope inclination should in no case exceed those specified. .. 8. ADDITIONAL SERVICES Due to the relatively steep nature of the proposed slopes, Unconfined Compressive Strength tests should be periodically performed on block samples obtained during the excavation of the quarry to confirm the strength values used in our analysis. In addition, as the quarry is excavated, a representative of our firm should inspect the slopes to determine if the observed r- soils are consistent with the soil conditions anticipated in our slope stability analyses and to identify soil conditions at the site that would decrease the anticipated stability factors of safety. This inspection should occur at least as the quarry is deepened every 25 vertical feet and more .. frequently if warranted by the soil conditions encountered. 9. LIMITATIONS 1. The conclusions and recommendations of this report are for design purposes for the Thoming Aggregate Quarry as described in the text of this report. The conclusions and recommendations in this report are invalid if, • The slope details change 29007.GOI/ST03R1215 August 21,2003 ©2003 Kleinfelder,Inc. Page 4 of 5 r A