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roughly the same for the replaceznent wall, do not appear to have caused any bearing <br /> capacity problems to date. - <br /> Recommendations - <br /> It is recommended that the existing retaining walls be replaced so as to minimize any <br /> further impact on the driveway and possibly on the house.Replacement walls can be built <br /> at the site because the reason for the wall movement is the deterioration of the timbers <br /> and the connections between them and not because the site as a whole appears to exhibit <br /> ' any detrimental factors that would preclude a retaining wall from performing <br /> satisfactorily. <br /> We have analyzed the boulder wall option prepared by the contractor Mr. Sundby <br /> proposes to perform the wall replacement work. Our computations of the boulder wall <br /> depicted in his drawings reveal that the wall will be stable provided: <br /> • adequate drainage is incorporated into the design by way of free-draining backf'�ll <br /> . • backfill material is adequately compacted <br /> • sufficient quantities of geosynthetics are used to reinforce the back-f'�ll soil <br /> (preferably using a wrap-around facing) " <br /> • the design height and setback of the walls (tiers)is not exceeded. <br /> Thank you for this opportunity to provide assistance on your project. If you have any <br /> . questions,please call Jedediah Greenwood at(952) 832-2773. . <br /> Sincerely, � <br /> .,� ���. �� � � . <br /> � ... <br /> Jedediah Greenwood <br /> Geotechnical Engineer <br /> Enclosures <br />