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r • <br /> CT ENGINEERIING i 80 Nickerson <br /> N Suitt'302 <br /> sc„,11e, <br /> {)8109 <br /> August 7, 2019 {2.c)1�)2hs-•is1 <br /> 2. <br /> lax: 28S-0618 <br /> City of Everett <br /> 3200 Cedar Street <br /> Everett, WA 98201 <br /> ATTN: Mr. Drew Martin <br /> RE: Marquee Apartments Everett Shoring <br /> 2721 Wetmore Avenue, Everett WA <br /> COE#PW1907-055 <br /> Response to First Building Review—Shoring. <br /> Dear Drew: <br /> We have received your review comments dated August 2, 2019 for the Marquee Apartments Everett <br /> Shoring project in Everett, WA. Below is our response to your comments regarding the structural <br /> shoring items and are numbered in the same manner as your correction notice. <br /> GEOTECHNICAL See additional response by the Geotechnical Engineer. The following is intended <br /> to clarify structural shoring calculations and design criteria. <br /> 1) Geotechnical Report and Addendums: See response by the geotechnical engineer. <br /> 2) Soil Nail Design Parameters: Confirming the Soil Nail design parameters presented in the <br /> geotechnical report were used for soil nail wall design. <br /> 3) Soil Nail Wall Surcharge Loading: with SnailZ software, all live loading: i.e. construction, traffic <br /> and adjacent building surcharge loading are input as maximum ASD vertical loading. See also <br /> response to item 4. <br /> 4) Soil Nail Wall Surcharge Loading: Surcharge loading is input into SnailZ software as ASD <br /> vertical loading. Please reference previously submitted soil nail calculations. The design loading <br /> was included in the calculations and also summarized in wall sections on Sheet SS4.1 for each <br /> location. This agrees with the minimum 250 psf minimum construction/traffic surcharge loading. <br /> In addition, the west wall was designed for 500 psf construction surcharge loading and verified for <br /> concrete pump truck outrigger loading. <br /> 5) Soil Nail Wall Surcharge Loading from Adjacent Buildings: As noted in response to Item 3 <br /> and 4 above, surcharge loading is input as vertical loading. In the previously submitted shoring <br /> calculations Page 79 of 180—South and Page 130 of 180- North the building weight per Square <br /> Foot and Wall weight per linear foot(including tributary live and dead and snow loading)are <br /> included in the vertical loading section of the subsequent soil nail runs. <br /> 6) Figure 3 vs. Design recommendations tor Vertical Elements and/or Corner Brace Vertical <br /> Element Piles: Design Parameters for Vertical Elements will be clarified in a supplemental letter <br /> by the Geotechnical Engineer. Design based on the passive pressure triangle loading is a <br /> "truncated triangle" per text of Figure 3 was confirmed with the geotechnical engineer. <br /> 7) Corner Brace at North-East Corner: To clarify, a corner brace was used in the north east <br /> corner due to an existing sanitary sewer line in the alley that is approximately 14 feet deep. The <br /> design for this corner brace is found in previously submitted calculations Page 121 to 124 of 180 <br /> following loading RE Figure 3 using Civil Tech pile design software. .RE Section 4/SS4.1 for <br /> design loading. <br /> 8) Vertical Elements: Reference previously submitted calculations and attached supplemental <br /> shoring calculations. Reference the boring logs which indicate shallow fill over very dense glacial <br /> soils over 50 blow count. VE piles are used for initial lift"belt and suspender"support of the <br /> existing building to get the initial lift of nails installed. As noted in response to Item 5 above, the <br /> Structural Engineers <br />