4711 GLENHAVEN DR 2016-01-01 MF Import

., - 3.0 SUBSURFACE EXPLORATION Our field study included excavating a series of exploration pits and a visual geologic hazard reconnaissance to gain information about the site. The various types of sed'unents as well as the depths where characteristics of the sedimenu changed aze indicated on the exploradon logs presented in the Appendix of this re>>ort. The depths indicated on the logs where condidons changed may represent gradational variations between sediment rypes in the field. Our explorations were approximately loc2.ted in the field by pacing from ]mown site features shown on the aforementioned site sketch. The conclusions and recommendations presented in tkus report are based on the 5 exploration pits completed for this study. The number, location and depth of the explorations were accomplished within site and budgetary consvaints. Because of the nature of exploratory work . below ground, extrapolation of subsurface conditions between field exploraticr.s is necessary. It should be noted that differing subsurface conditions may sometimes be present between exploration holes due to die random nature of deposition and the alteration of topography by past grading or filling. The nature and extent of any variatiors between the field explorations may not become fully evident until construction. If variations aze observed at that time, it may be necessary to re-evaluate specific recommendations in this report and ma.i:e appropriate changes. 3.1 Exploration Pits Five exploration pits were excava�ed with a trac}:hoe. 'The pits permitted direct, visual observation of subsurface conditions. Materials encountered in the e�ploration pits were studied and classified in the field Uy an engineer from our firm. All exploration piu were bacl.�f"illed immediately after examination of the sediments and recording our observations. Selected samples were then transported to our laboratory for further visual classification, as necessary. 4.0 SUBSUI2FACE CONDITIONS Subsurface conditions on the parcel were inferred from the field explorations accomplished for this study, visual reconnaissance of tl�e site and review of the geologic map of the Everett Quadrangle. As shown on d�e enclosed logs, the exploration pits generally encountered loose fill soils overlying glacially deposited, loose to dense, silty fine sand. The following :ecrion presents information regarding the geologic origin of site soils. 4.1 5trati;ranhv The geologic map of d�e Everett Quadraugle indicates Q�at d�e sediments beneath this site arc Part of �hc Vashon glaci,.l drift. Our exploration pits encounrered soils which we interpreted to consist nf recession;il o�t��ash sand and �vcathered lodgement till which are likely located just 3 1