1530 51ST PL SW 2016-01-01 MF Import

Gcotcchnical Engincering Fvalua...,n Let�cr NGA File No. 886013 Mosman Basement December 17, 2013 Everett, W�shington Page 2 This letter provides our opinior.s and recommendations regarding the desig� and construction of the basement expansion. For our use, we have been providcd wi!h plans and pictures from the over- excavation and cons[ruction of the lower basement area; original house plans; ske:ches of the basement area prepared by CG Engineering; and a list created by you of your knowledge of what construction items had bcen done in the past and your preliminary ideas of improvements that you would like addressed. SiTE CONDITIONS Surface Conditions 7'he property consists of an irregular-shaped parcel covering approximatcly 0.17 acres as shown on the Schematic Site Plan in Figure 2. The property is relatively level to gently sloping from the southeast to he nonhwest. The site is currendy occupied by an existing single-family residence within the cen:.�l portion of the property. Thc ncwly constructed basement area is located within thc northem half of the existine residcnce. An existing deck is located along [he western side of the residence. The propc.ry around the residence is generally covered with grass, landscaping plants, and young ro mature trces. The property is bordered to the north and south by existing residential properties,to the cast by 51" Place West, and a vacant woodcd and crcek area to the west. We did not observe surface water within thc vicinity of the residence during our sitc visit on November 18, 2013. Subsurface Conditions Geology: The gcologic imits for tlus are� are shown on the Geologic Map of the Evcrctt 7.5-Minute uadraagl 1 Snohomish Countv, Washington, by Jamcs P. Minard (U.S.G.S., 1985). 'I'hc si[c is mapped as Advance Outwash (Qva). The advance outwash is descnbed as cican, stratificd sand and 6�ravels. Our cxplorations gcnerally cncountered undocumentcd fill soils underlain by fine to medium sand soils consistcnt with thc dcscription of advance outwash soils. Explorations: T}�e subsurface conditions wilhin the sitc were explored on Monday Novcmbcr 18, 2013 by excavatiag two Icst pits to depths ranging from 5.5 and 8.0 fcet below thc existing ground surface on the northcR, and eastcro sides of thc existing bascmcnt walls, respectively. Wc also performed one hand excavated ��ole along thc western portion of thc basemcnt area. The .�oproximatc locations oC our NELSON GEOTECHNICAL �SSOCIATES, INC.