9512 EVERGREEN WAY 2022-08-29 - Laserfiche WebLink

May 4, 2017 HWA Project No. 2017-036-21 2 FIELD AND LABORATORY TESTING 2.1 FIELD INVESTIGATION The field work consisted of a site reconnaissance and subsurface exploration program conducted on April 18th, 2017. Six hand borings and penetration tests utilizing a drop weight cone penetrometer (DCP) were conducted to evaluate subsurface conditions in the vicinity of the building expansion footprint and the proposed parking area. The exploration locations, which are plotted approximately on the Site and Exploration Plan, Figure 2, were based on taping distances in the field from know structures and from each other. A geologist from HWA logged each exploration and recorded all pertinent information. Soil samples obtained from the explorations were classified in the field and representative portions were placed in plastic bags. These soil samples were then taken to our Bothell, Washington, laboratory for further examination and testing. Pertinent information including soil sample depths, stratigraphy, soil engineering characteristics, and ground water occurrence was recorded. The stratigraphic contacts shown on the individual exploration logs represent the approximate boundaries between soil types; actual transitions may be more gradual. The soil and ground water conditions depicted are only for the specific date and locations reported, and are not necessarily representative of other locations and times. A legend of the terms and symbols used on the exploration logs is presented in Figure A-1. Summary logs of the test pits are presented in Figures A-2 and A-7. 2.2 LABORATORY TESTING Laboratory tests are currently underway on selected samples obtained from the hand borings to characterize relevant engineering and index properties of the site soils. Laboratory tests included determination of in -situ moisture content and grain size characteristics. The tests are being conducted in general accordance with appropriate American Society of Testing and Materials (ASTM) standards. The test results and a discussion of laboratory test methodology will be presented in Appendix B, or displayed on the exploration logs in Appendix A and in Appendix B on figures B-1 and B-2. 3 SITE CONDITIONS 3.1 SITE DESCRIPTION The existing Evergreen Branch Library site is located along the west side of Evergreen Way, southeast and northeast of its intersection with Holly Drive and 4th Avenue West, respectively in Everett, Washington (see Figure 1). The site topography is relatively flat with overall relief of about 10 feet. The site grade slopes gradually upward on and average of about 3 percent towards Final Geologic Assessment 2 HWA GeoSciences Inc.