711 112TH ST SE 7 ELEVEN Geotech Report 2018-01-02 MF Import

Subsurfoce Erplora�ion and Proposed 7-Elrven Properry Ceorechnical Engineering Report Everett, Washingmn Pro/rcr und Site Condlrionr not be reached. This material was interpreted as lodgement till. The lodgement till sediments w�re deposited at the base of an ice sheet, whirh filled the Puget Lowland more than 12,000 years ago. The ice sheet was several thousand feet thick, which resulted in the till being a compact soil possessing high strength, low compressibiliry, and low permeability chazacteristics. The lodgement till extended below the termination depth of the explorations. This material would provide suitable foundation support for the project. 4.2 Hvdrolo�y Minor to moderate ground water scepages were observed in all the explorations at the time of our study in January 2001. The seepage elevations varied but were typically observed on top of the dense lodgement till or fill sediments. One of the seepage zones in EP-3 was observed within a sand lense within the lodgement till material. The seepages were interpreted to represent a perched wndition. Perched water is formed when water infiltrates through permeable sediments and becomes vapped or perched atop a less permeable material such as the lodgement till or dense, fine-grained fill soil. It should be noted that fluctuations in the level and amount of ground water may occur due to the time of the year, variations in the amount of precipitation, and changes in site development. Additional ground water seepages could also be encountered at random locations and depths within tl�e existing fill soil. A9arch 19, 2001 ASSOGATED E�RTN SClENCES srsrr �,,, . eFcasr.Ut . n: nvr��u �u - u:n� Page 5 R�{