2400 33RD ST GEOTECHNICAL INVESTIGATION 2018-01-02 MF Import

PW OCoOLt -(> f Milbor-Pita ;C ASSOCIATES, INC. 21 Dec99 SC 130 Zimmer Gunsul Frasca Partnership 1191 Second Avenue, Suite 800 Seattle, Washington 98101 Attention: Mr -Don Miles, Project Manager RE: Addendum #I: Subsurface Exploration and Geotechnical Engineering Report for the Everett Transit Intermodal 'Transportation Center, Everett, Washington Introduction In a meeting held in early December at Inca Engineer's office, the following questions were asked concerning the geotechnical recommendations. • What was the pavement section design of existing Smith Ave. and 32/33 d Streets and why have they performed so well? • Could the initial overexcavation and backfill recommendations Ue eliminated if the 'avement section recommendations were altered? What is the lateral foundation design recommendations for traffic signals poles proposed for the project? • Should the large flower bed areas be drained from below? • What is the probable downdrag effect from the bridge embankment fill on an existing pipeline? This addendum focuses on these issues only. This brief report should be used in conjunction with the earlier Milbor-Pita & Associates, Inc. report dated 25Aug99. Background To answer the above questions, more data was required over the entire project site. This data needed to be focused on the upper near surface soils. The previous borings did evaluate the overall geologic conditions of the site, but did not obtain enough specific data on the upper 5 feet of the site's existing soil. Also, no data was available on the pavement thickness or the soil conditions immediately beneath the existing pavement sections at or near the site. Asa result, the field investigation was structured so that data could be obtained in these areas. Figure A-l. Access at the site was good. Geotechnical,'I'wmel and Environmental Engineers Phone (425) 861-577 3080 1252i Ave NE fax (7 nelbme, WA 98005 Page 1 25) 8G-0G7