02-13-1996 Council Packet - Laserfiche WebLink

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Allan Block’^*' 5. Your proposed construction procedures are appropriate. I recommend excelsior netting be dormant seeded for Spring germination of appropriate vegetation. 6. All block and grid installation in accordance with the specifications in the Allan Block Design Manual. 7. I have included the engineered wall details for the a 6'wall which represents your major wall including buried block. In summary; said walls can be constructed as designed with the understanding that design parameters are for internal and external stability only and no provision for overall slope stability. As you noted, the slope has been stable and it is reasonable to assume it will remain so if conditions do not substantially change; the most critical condition being ground water. For this reason we have recommended the above procedures which we feel will insure that no hydrostatic pressures develop and selected backfill will insure soil uniformity and performance. Said construction neither improves or diminishes the global stability of the slope but given that you will be eliminating the most probably failure scenario, your approach is entirely appropriate with the disclaimer that should the total slope fail, sail failure would likely include the retaining walls. Mr. Gustafson of Bonestroo and Associates has apparently expressed concern over the effect of the "weight" of the soils on the slope. This is a legitimate concern. I feel the existing walls suggest adequate bearing capacity and slope stability and the proposed design parameters above will improved the current situation and reduce the prospect of future failure. For the Allan Block Corporation, Don Gordhamer Technical Services copy: Shav1 Gustafson Allan Block™ Retaining Walls Allan Block Corporation • 7400 Metro Boulevard, Suite 185 • Edina. MN 55439 • Phone 612/835-5309 • Fax 612/835-0013