202 ALDER ST Geotech Report 2018-01-02 MF Import

1 , P�oposed t'iE��c R�<1gr Suhsurfa��r F_cplorrUmn, Ceolugi�Huzurds, lnfi(lrution Po�enlial, Elementary Schoo!Rep(acement and Preliminary Geotechrtica!Engineenng Report Everetr, Wathington Project and Sire Conditioru t2.0 PRO]ECT AND SITE DESCRIPTION , The existing View Ridge Elementary School site is approximately 9.5 acres in total area. Topography generally consists of high areas on the south and east edges of the site, a smaller topographic rise on the northwest part of the site, and celatively level topography elsewhere. , Overall vertical relief across the site is approximately 20 feet. Significant slopes are present near the south and east edges of the site. None of the slopes appear to meet the City of Everett , definition for Landslide Hazard A-eas as defined in Everen Municipal Code Tide 19, Chapter 37.080 due to the fact that the slopes are man-made c�it slopes shorter than 15 feet, and were presumabty created by previously permitted grading. The site is occupied by the ' existing school buildings, which appear to be about 40 years old. The existing buildings are typicalty single-story structures with flat roofs. Although the buildings appear to be nearing the end of their design life, a visual reconnaissance of the exterior of the buildings did not ' reveal �ndications of poor foundation performance. Existing concrete walkways and asphalt parking lots, driveways, and play areas are in good condition for their age, and show no visual evidence of pervasive setdement or subgrade drainage problems. ' The project will include demolition of the existing school buildings, and construction of a new , elementary school. The new buildings will be located on the west-central part of the site, in an area currendy occupied by the exist,ng buildings. We anticipate that the new buildings will be low-rise structures with low to moderate foundation loads typical of school construction ' methods and matcrials. New sidewalks, utilities, and pavement a�eas are also expected. We anticipate that the new schoo! buildings aud related improvements will be constructed close to existing grades, without the need for deep eazthwork cuts or t6ick fills. Preliminary project ' plans indude a substantial retaining wall along the south property boundary to accommodate a new driveway. At the time this report was written, the wall location, height, and type had not been determined. We anticipate that we will address the geotechnical requirements of the ' south wall when these design details have been finalized. , 3.0 SUBSURFACE EXPLORATION ' Our subsurface exploration compfered for this project included advancing seven expioration borings and installing one well. "fhe conclusions and recommendations presented in this report are based on the explorations completed for this study. The locations and depths of the ' explorations were completed within site and budget constraints. 1 ISeptem6er 22, 2010 � ASSOCIATED EARTH SC/ENCES, INC'. NWGbb�KfllID153A2�Pro�rcrs110/P7ISSIKE�WV Page 2 t