501 RIVERSIDE RD REGIONAL DISPOSAL COMPANY EVT TRANSFER FACILITY PHASE 1 SITE IMP Geotech Report 2025-07-28

RDC EVERETT TRANSFER FACILITY< Everett,Washington thelaboratorytestingand determination, and California Bearing Ratio (CBR)tests. A description of the test results are presented in Appendix B. SITE CONDITIONS Surface Conditions The site is about 15.77 acres and is relatively flat and currently occupied by the existing transfer facility, including existing RR tracks, maintenance and office buildings, and stacks of shipping containers. The existing grade is at approximately Elevation 14 feet on west side of the site and about Elevation 11 feet. A 3-to 4-foot-tall RR tie retaining wall is located on the northwest side of the site. Two RR track lines cross through the site and run in the north-south direction. The west line (Track 1) is located ±145 feet east of Riverside Road and the east line (Track 2) is located an additional ±230 feet to the east. Riverside Road ends at the site with an asphalt paved truck I turn-around. Snohomish County occupies an office building just east of the turn-around. Existing structures include two covered maintenance buildings on the west side of the site, and an office building and covered maintenance area between Track 1 and Track 2. The site is presently surfaced with a combination of Portland cement concrete pavement (PCCP), asphalt pavement,and crushed gravel as described below: ■ Between Tracks 1 and 2: PCCP is located near the south end of the facility between Tracks 1 and 2 where active loading of rail cars occurs. Asphalt pavement extends north from the PCCP to approximately the office building and at that point the ground is surfaced with thin layer of crushed rock over asphalt north to the entry road. South of the PCCP and asphalt pavement areas there exists a small truck turn-around where exposed soil with some grass vegetation exists and there is no crushed gravel or pavement surfacing. • West of Track 1: The site is surfaced with crushed gravel, asphalt, and concrete between the maintenance buildings and Track 1. The gravel surfacing appears to extend north until transitioning to asphalt pavement near the north entrance. PCCP was adjacent to Track 1 near the Riverside Road truck turn-around. 111 The locations of surrounding site features are shown on the Site Plan, Figure 2. Pavement Conditions We evaluated the existing p avement surface conditions by visual inspection and measured the pavement section at seven locations in borings(B-2 through B-8). We completed a visual condition survey of the existing pavement,where the existing pavement was visible. A summary of the visual condition survey is provided below. • Between Tracks 1 and 2: We observed low and medium severity fatigue cracking of the asphalt pavement south of the PCCP. The PCCP was observed to failing in several locations. In particular, we observed an area of significant spelling of the PCCP over an area approximately 20 feet long by 14 feet wide. Low and medium severity fatigue cracking and surficial failure of the pavement was observed between the PCCP and the office building. Isolated potholes were observed adjacent to Track 2 in this area. The majority of the pavement Page 2 June 18,2013 GeoEngineers,Inc. File No.4322-002-00