1215 W MUKILTEO BLVD 2017-07-28 - Laserfiche WebLink

April 29,2015 HWA Project No.2014-162-21 1) Site stripping and fill placement should be accomplished in small sections to minimize exposure to wet weather. Excavation or removal of unsuitable soil should be followed promptly by placement and compaction of a suitable thickness of clean structural fill. The size and type of construction equipment used may have to be limited to prevent soil disturbance. 2) Material used as structural fill should consist of clean granular soil. Maximum fines content should be reduced to not more than 5% passing the U.S. Standard No. 200 sieve, based on wet sieving the fraction passing the 3/4-inch sieve. The fine-grained portion of structural fill soils should be non-plastic. 3) No soil should be left un-compacted so it can absorb water. Stockpiles of excavated soil should either be shaped and the surface compacted, or should be covered with plastic sheets. Soils that become too wet should be removed and replaced with clean granular materials. 4) Excavation and placement of fill should be monitored by someone experienced in wet weather earthwork to determine that the work is being accomplished in accordance with the project specifications and the recommendations contained herein. CONDITIONS AND LIMITATIONS We have prepared this report for Howard and Frances Lorentz for use in design of this project. This report should be provided in its entirety to prospective contractors for bidding and estimating purposes; however, the conclusions and interpretations presented in this report should not be construed as our warranty of the subsurface conditions. Experience has shown that soil and ground water conditions can vary significantly over small distances. Inconsistent conditions can occur between explorations and may not be detected by a geotechnical study of this scope and nature. If, during future site operations, subsurface conditions are encountered which vary appreciably from those described herein, HWA should be notified for review of the recommendations of this report, and revision of such, if necessary. We recommend that HWA be retained to review the plans and specifications to verify that our recommendations have been interpreted and implemented as intended. Sufficient geotechnical monitoring, testing, and consultation should be provided during construction to confirm that the conditions encountered are consistent with those indicated by the explorations, to provide recommendations for design changes should conditions revealed during construction differ from those anticipated, and to verify that the geotechnical aspects of construction comply with the contract plans and specifications. 2014-162 Letter Report 9 HWA GEOSCIENCES INC.