3606 W MUKILTEO BLVD 2016-01-01 MF Import

Geotcchnical Enginecr'ng Gvaluation Mukihc a Doidcvard Devclopmcnt Evcrett, Wnshington March 31, 2003 NGA Filc No. 366503 Pagc 3 existing residcnccs arc accesscd by gravcl drivc�vays, and an asphalt parking lot is located adjaccm ro thc commcrcial structurc. Shallo�v standing watcr was obscrved in an arca appro�imatcly 100 fcet widc along the souUurn propcily line, at the �vestem sidc of the site. The backhoe that was uscd to explorc the sitc subsurface conditions had difticulty crossing this area and Ieft ruts in the wet arca approximatcly one foot deep. A drainage ditch is located ncar the castcm cdgc of the sitc. Wnter was fluwing ro thc north in this ditch at the time of our fic)d mconnaissancc on March 19, 2003. Slight surficial seepagc was obscrved in a small area wcst of the centrnl residcncc. Thc site is vegetated with Inwns, field grass, young to mature evergrcen and deciduous trces, blackberry bushcs, and brush. Thc ground surface within tl�c sitc slopes gently to moderately down toward the north. At the soutlienst comer thc ground surfnce east of the drainage dilch slopes down toward the northwest with inclination as steep as 3H:1 V, based on our observations and the provided site pinn. Cuts have been mnJe cnst, south, and west of the commcrcinl swcture at thc northwest corner of the site. These cuu have inclinations as stcep as 2FI;1V, bnsed on thc provided sitc plm�. The abovc slope inclinations are consistent with thc slopc inclinations wc obscrvcd in thc licld. \Ve did not obscrve indications of instability in these cuts. Subsurfacc Conditions Ceology: Most of the Puget Sound region was alTected by past inVusion of continental glaciation. The I�st period of glaciation, thc Vashon St�dc, cnded approximatcly 10,000 to 1 I,000 ycars ago. Many of thc geomoiphic fcnturcs sccn lodny are a result of scouring and overriding by glacial ice. During the Vashon Stadc, the Puget Sound region was overridden by over 3,000 feet of ice. Soil layers overridden by Ihc ice shcct �vcrc compacted to a much grcatcr c�tcnt tlian thosc that wcrc not A typical glacial sequcncc indudcs rcccssional ouhvash sand, ovcrlying glacial till or d�ifl, and undcrlain by advancc out��a�h. 'I�hc gcologic units for this arca are shown on thc Distribution and Description of Gcoloric Units in thc �4ukiltco Ouadrnn ��, 1Vashington, by lamcs P, Minard (US Gcological Survcy, 1982). Thc site is mapped as glacinl till, which in this aren generally consists of a non-sorted mixture of silt, sand, and gra��cl. Our esplorations cncountcred �mri:+ble soils consisting mostly of glacial drift and recessional NELSON GEOTECHN/CAL ASSOC/ATES, INC.