2222 EVERETT AVE 2016-01-01 MF Import

Subsnrface Erplorarion. Geofogic Hazard, and Everett Schoo!District Murnrenance Fncrlrry Pre(imiimrv Georechnica!Engineering Report Everet(, Wns4i�igton Desien Rarnmmo d �' � -- ...__..�.._._ ' The conclusions and recommendations presented in this report are based on the exQloration borings completed for this study. The number, location, and depth of the explorations were completed wiUiin site constraints. Because of the nature of exploratory work below ground, extrapolation of subsurface conditions between field explorations is necessary. It should be noted that differing subsurface conditions may sometimes be present duc to the random nature of deposition and the alteration of topography by past grading and/or tilling. The nature and extent of any variations bctween the field explorations may not becomc Cully evident until construction. If variations are observed at that time, it may be neccssary to re-cvaluate specific recommendations in d�is report and make appropriate changes. 3.1 Exploration Pits Seven exploration pits ��rc cnmplcted by a subcontracted backhoc. All of the pits were excavated to approsimately 13 feet below tl�e existing surface. During the excavating, samples were obtained of r.��h distinct soil type in each pit. The samples obtaincd from the pits were classified in die field and representative portions placed in watertight containers. The samples �vere then transpurted to our laboratory for further visual classi(ication �nd geotechnical laborarory testing, as necessary. The pits were continuously obscrvcd ;md logged by an engineering geologist from our firm. The exploration logs presented in the Appendix are based on the field logs, excavation rates and action, and inspection of die samples secumd. l 4.0 SUBSURFt\CB COND["IIONS Subsurface conditions at du project site were inferred from the field e�plorations accomplished for dtis smdy, visual reconnaissance of the site, and a review of applicablr geologic literature. As shown on the ticld logs, the exploration pits generally encountered loose to medium dense fill overlying a deposit cunsisting of stiff to very stiff glaciolacustrine silt and medium dense to deise glaciolacustrine silry sand. The following section presents more det:iiled subsurface information organized from the upper (youngest) ro the lower (oldest) matcrial and sediment types. 4.l StratiQra� Fill Fill soils were encountered in all seven exploration pits excavated at the site. 'rhe fill was between 6 to 10 fcet decp. Generally, fill in the north half of the site was a mediuro dense silry sand with litde gravel and tr�ce amounts of cobbles and organics. This fill is intcrprered to bc derived from till soils. The fill encountered in the east side of the south half of thc site was variable in nature and ranged from medium dense silry sand to debris laden silts and loose C Mtry �' zC01 ASSOClATF.D F.iRTN SCIENCES, INC. JDCian-tiE01051A1-D:Ixyldil.R01-IY:h' Page 3 �\ V