Laserfiche WebLink
Sabrina Fandler <br /> City of Everett Public Works �# <br /> Engineering/Permit Services Division 5- <br /> 1 February 15, 2017 <br /> • The onsite soils are subject to periodic shallow slides/slumps due to weathering of <br /> the upper layers, particularly during extensive wet periods. As the pond crest is <br /> located along the top of the steep slope is there a potential that shallow slides could <br /> undermine the pond embankment? The Lock and Load Wall Detail provided does not <br /> show a detail for the South Wall. Will the 5/8-inch minus crushed leveling pad be <br /> founded 3 feet below ground surface, as shown for the North Wall detail? Our <br /> concern is shallow sliding of the near surface soils undermining the foundation of the <br /> wall. <br /> Response: Please see the attached geotechnical engineer response letter prepared <br /> by Terra Associates, Inc. <br /> • The pavement sections presented in the original geotechnical report seem thin for the <br /> areas where heavy trucks will operate. The sections presented for heavy traffic areas <br /> are 3 inches of HMA over 6 inches of CRB or 5 inches of full-depth HMA. Using a <br /> structural coefficient of 0.42 for HMA and 0.14 for CRB, results in design AASHTO <br /> Structural number of 2.1. Using a subgrade resilient modulus of 10,000 psi, typical <br /> AASHTO input parameters, and the ESAL value presented in the report, we calculate <br /> a required structural number of 2.51 using the program Darwin by AASHTO. <br /> Response: Please see the attached geotechnical engineer response letter prepared <br /> by Terra Associates, Inc. <br /> We believe that the responses above, together with the enclosed revised plans and documents, address <br /> all of the comments in your memorandum dated October 21, 2016. Please review and approve the <br /> enclosed documents at your earliest convenience. If you have questions or need additional information, <br /> please contact me at this office. Thank you. <br /> Respectfully, <br /> !tri( t <br /> Costa Philippides, P.E. <br /> Project Engineer <br /> CP/hd <br /> 17798c.004.doc <br /> enc: As Noted <br /> cc: Greg Bertch, Bertch Capital Partners <br /> Kathy Craft, Craft Architect <br /> Daniel K. Balmelli, Barghausen Consulting Engineers, Inc. <br />