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Pw orOoq-,>?U <br />I Milbor-Pita <br />(•ASSOCIATES, INC. <br />l�C 2IDec99 <br />SC130 <br />Zimmer Gunsul Frasca Partnership <br />1191 Second Avenue, Suite 800 <br />Seattle, Washington 98101 <br />Attention: Mr..Don Miles, Project Manager <br />RE: Addendum #1: Subsurface Exploration and Geotechnical Engineering <br />Report for the Everett Transit Intcrmodal Transportation Center, Everett, <br />Washington <br />Introduction <br />In a meeting held in early December at Inca Engineer's office, the following questions <br />were asked concerning the geotechnical recommendations. <br />• What was the pavement section design of existing Smith Ave. and 32/33`a <br />Streets and why have they performed so well? <br />• Could the initial overexcavation and backfill recommendations be eliminated <br />if the pavement section recommendations were altered? <br />• What is the lateral foundation design recommendations for.traffic.sitmals <br />poles proposed for the project? <br />• Should the large flower bed areas be drained from below? <br />• What is the probable downdrag effect from the bridge embankment fill on an <br />existing pipeline? <br />This addendum focuses on these issues only. This brief report should be used in <br />conjunction with the earlier Milbor-Pita & Associates, Inc. report dated 25Aug99. <br />Background <br />To answer the above questions, more data was required over the entire project site. This <br />data needed to be focused on the upper near surface soils. The previous borings did evaluate <br />the overall geologic conditions of the site, but did not obtain enough specific data on the <br />upper 5 feet of the site's existing soil. <br />Also, no data was available, on the pavement thickness or die soil conditions immediately <br />beneath die existing pavement sections at or near the site. As a result, the field investigation <br />was structured so that data could be obtained in these areas. <br />Field Exploration <br />Northwest Cone Exploration (NCE), a Milbor-Pita subcontractor performed cone <br />penetrometer testing (CPT) at die project site. The testing was performed on December 13 <br />and 15, 1999, at 26 locations shown on Figure A-1. Access at the site was good. <br />Geotechnical, Tunnel and Environmental Engineers <br />3080 125' Ave NE Phone (425) 869-5778 <br />13e11awe, WA 98005 Page I Fax (125) 801-0677 <br />