6617 ASSOCIATED BLVD AMAZON Geotech Report 2022-10-25

• • KLE/NFELDER �� • • • 4.3.2 Liquefaction Hazard • • We encountered some areas of loose to medium dense soils overlying the denser ablation till at • the site. When saturated, these soils may be susceptible to liquefaction during a strong • earthquake, resulting in reduced soil strength and stiffness. In general, it appears that saturation • of these soils is limited to perched groundwater sitting on the underlying, denser and less • permeable soils. Some saturated zones observed during drilling were only on the order of about • one foot thick. In addition, soils may not be saturated during the drier times of year. We • recommend that Kleinfelder be provided with the location and layout of any planned structures, • so that potential effects of liquefaction on foundation capacity, vertical and lateral, can be • evaluated on a case-by-case basis. • • 4.4 PAVEMENT REHABILITATION AND NEW PAVEMENT SECTIONS • • 4.4.1 General • • Based on our visual pavement condition assessment, a portion of the site pavement is in very • poor to fair condition and a portion is in good to very good condition. In general, the asphalt • pavement sections in the associate parking lot stalls are considered very good and a large • portion of the truck apron on the east side of the warehouse is in good condition. The drive • lanes between the associate parking stalls, as well as drive lanes on the north and south sides • of the warehouse, and at the northeast corner of the warehouse are heavily fatigued with • significant areas of alligator cracking, past patching and some potholing. Full-depth • reconstruction should be considered for these areas. • • The structural life of the existing pavements in automobile parking areas could be extended by • performing preventive maintenance including annual crack sealing and slurry coating. Because • the existing pavement sections are relatively thin, they are not considered adequate for the • proposed delivery van route or for the proposed truck loading areas. We recommend full-depth • reconstruction of the pavement sections for truck traffic and van staging and parking areas. The • Portland Cement concrete (PCC) pavement near the loading dock east of the warehouse • appears in good shape and preventive maintenance is recommended to extend its design life. • • We understand that heavy-duty pavements may be subjected to 200 trucks per day and a • typical loaded trailer weight of 75,000 pounds based on the Design Criteria and Outline • Specifications for the Development of AMZL Market Refurbishment (MR) Delivery Stations, • • 20203884.001A/SEA20R110164 Page 15 of 28 June 1, 2020 ©2020 Kleinfelder • •