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Kirk Brooks <br />From: Ben Nelson [ben@acfwest.com] 7 p <br />Sent: Tuesday, September 21, 2010 1:26 PM r��� L� <br />To: john@signature-homes.net <br />Cc: I!irR Brooks <br />Subject: :ea Breeze Way Development, geogrid reinforced concrete block wall <br />Attachments: <iO3_eng.pdf; appendD.pdf; TDS_MG10XT.pdf <br />John, <br />As the Northwest regional distributor of the Mirafi Miragrid geosynthetics we have been provided a copy of the desigr for <br />the geogrid reinforced retaining walls for the above referenced project. There appears to be a typographical error on the <br />plan, specificaliy plate #3 where the "Miragrid 18XT" is called out for on wall heights 9- 11.5'. We believe it to be a <br />typographical error because there is no product "Mirafi, Miragrid 18XT". <br />1Ne understand that the engineer of record, Liu & Associates, is unavailable at this time to clarify the plans, and we have <br />t�een asked to make a"Best Interpretation" of them. So, based on our ex�ensive history of supplying materials to similar <br />projects we presume that the product should have been listed as "Miragrid 10XT', which would make sense for the height <br />of wall, type of fascia, and lift height. We are not an engineering firm, and do not imply that we have done an engineered <br />analysis of the project, but we have supplied many similar projects and have never had the occasion to supply a grid <br />stronger than the Miragrid 10XT on walls that do not exceed 12'. <br />Attached is a copy of the standard data sheet for the Miragrid 10XT. Also attached are the Washington State Department <br />of Transportation Qualified Products List, which lists the Miragrid 10XT, and the Washington State Department of <br />Transportation Standard Plan D-3 for Geosynthetic Retaining Walis. You will note that the full Long Term Allowable <br />Design Strength (LTDS 4,180 Iblft, as listed on the WSDOT QPL) of the Miragrid 10XT would not be required even when <br />the design height of wall (per Standard Plan D-3) reached 35' (LTDS 2,580 Ib/ft required on type VI wall, 1.25' lift). <br />I hope that this is helpful in determining the acceptabili?y uf the Miragrid 10XT. Please let me know if 1 could be of further <br />assistance. <br />Benjamin C. Nelson <br />ACF West Inc., Woodinville office <br />(425) 415-6115 office <br />(206) 730-0596 cell <br />