1210 W MARINE VIEW DR Geotech Report 2022-10-25

GEOTECHNICAL ENGINEERING REPORT PROPOSED PORT GARDNER SUBSTATION 1210 WEST MARINE VIEW DRIVE EVERETT,WASHINGTON Project No. 1779.01 15 November 2017 INTRODUCTION The geotechnical engineering exploration and analysis have been completed for the proposed Port Gardner Substation in Everett, Washington. Two borings were completed to depths of approximately 49 to 54 feet below the existing ground surface to evaluate subsurface conditions. In addition,six direct push probes were advanced to depths of approximately 20 to 24 feet as part of the environmental evaluation. Descriptive logs of the geotechnical explorations are included in Appendix A of this report. PROJECT INFORMATION The project consists of constructing a new single-bank substation. The proposed configuration of the substation is illustrated on the Site and Exploration Plan, Figure 1. Improvements at the site are expected to include: • The construction of transmission line dead end towers,a circuit switcher,a neutral reactor,and a 12.5 kV switch. • A new metal-clad switchgear enclosure and slab and a new slab-supported transformer with a perimeter oil containment slab and associated piping. • The existing site grade is at elevation 14 feet, and the substation yard grade is expected to be at elevation 16 feet. • Underground electrical conduits will be installed,as well as below-grade pre-cast concrete vaults; • Stormwater will be managed on site, although a nearby storm sewer may allow some to be directed off site. • Access to the substation will be provided by an asphalt-paved driveway at the north. SITE LOCATION AND DESCRIPTION The project site is located at 1210 West Marine View Drive in Everett, Washington. The site has approximate plan dimensions of 177 feet (north-south) by 121 feet (east-west). The site is bordered to Page I 1