1920 GRAND AVE 2016-01-01 MF Import

The topography of the eastem portion of the lots consists of a gentle slope from the edge of the sidewalk to the top of a slope. The westem half of the property slopes steeply down to the west toward the Burlington Northern Santa Fe(BNSF� railroad tracks at the base of the slope. 'Ihis slope descends at approximately 80 to ]00 percent over the full length of the site. The estimated height of the slope is approximately 70 fcet. Vegetation in the area consists of lawn within the yards of the existing residences at the top of the slope. Below the top of the slope, for its full heighG the acea is heavily vegetated with blackberties and other weeds. Also included in the vegetation are large fir trees and numerous vine maple and alder. The trees on the site appeaz to have grown straight, indicating that movement on the slope has been non-existent to minimal. Site Evaluation Subsurface Investigatlon On August 6, 1998,a DEA geological engineer perfortned a subsudace investigation of the site. A limited access auger advanced drill rig was used to drill two borings to a maximum depth of 25 feet. The borings were Iocated at th . north and south ends of the project area at the top of the slope. The borings were advanced using a hollow stem auger. During the drilling, Standard Penetration Tests(SPTs)wzre perfo�med continuously for the top 10 feet and at five-foot intervals for the remaining depth of the borehole. The SPTs utilized a two-inch diameter split spoon sampler and a 140-pound hammer. In perfortning the test, the sample tube is driven 18 inches ahead of the auger inro the soil with the hammer with a free fall of 30 inches. The number of blows required to drive the sample tube for each increment of six inches is noted and the last two increments are combined to calculate the Standard Penetration Number or"N-Value" for the depth from which the sample is taken. This N-Value gives a relative density for granular soils and a relative consistency for cohesive soils See ine site plan (Appendix) for the specific locations of the borings. Subsurtace Condldons During[he inve�tigation, four predominant soil horizons we encountered. Up to eight feet of fill was discovered on the northern portion of the property a[ the northwcst comer of 1918 Grand Avenue. However, the fill was not encountered at the southem end of the project. � Port Gardner Condominiums•Geotechnical Report page p