1020 N BROADWAY EVCC STUDENT HOUSING Geotech Report 2022-10-25

Proposal for Geotechnical Engineering Services Proposed Apartments: 1020 North Broadway,Everett,Washington September 27,2017 approximate. The following is a generalized description of the soils encountered in the borings. Asphalt: At our boring locations, we encountered 1.5 to 5 inches of asphalt surfacing. Fill: Below the asphalt, we encountered a surficial layer of fill overlying the native soil. This fill generally consisted of gravel base course and silty sand with gravel. The fill ranged from 21/2 to 5 feet thick. Vashon TM (Qvt): Underlying the asphalt and fill at our boring locations, we encountered medium dense to very dense silty fine to medium sand with gravel which we classified as Vashon Till. The till graded to dense to very dense at 21/2 to 5 feet below grade. Sandy layers with slightly increased moisture were encountered at about 10 feet below grade in our borings. The Vashon till encountered at our boring locations is consistent with the geologic mapping. All of our borings were terminated in till. Our subsurface descriptions are based on the conditions encountered at the time of our exploration. Soil conditions between our exploration locations may vary from those encountered. The nature and extent of variations between our exploratory locations may not become evident until construction. If variations do appear, PanGEO should be requested to reevaluate the recommendations in this report and to modify or verify them in writing prior to proceeding with earthwork and construction. 3.4 GROUNDWATER Groundwater was not encountered in our test borings to the maximum exploration depth of 15%2 feet below grade. The till underlying the site generally has low permeability and perched groundwater may develop in lenses of more permeable soil within the till formation. If encountered,we anticipate groundwater seepage rates will be light. Groundwater levels will change depending on the season, amount of rainfall, surface water runoff, and other factors. Generally,the water level is higher and seepage rates are greater in the wetter,winter months (typically October through May). 17-233 1020 North Broadway Page 4 PanGEO,Inc.