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December 13,2006 <br /> Project No.T-6001 <br /> • Slab-on-grade floors <br /> • Lateral earth pressures <br /> • Stormwater detention vaults <br /> • Subsurface drainage <br /> • Utilities <br /> • Pavements <br /> It should be noted that the recommendations outlined in this report regarding drainage are associated with soil <br /> strength, design earth pressures, erosion, and stability. Design and performance issues with respect to moisture <br /> as it relates to the structure environment(i.e., humidity, mildew, mold)are beyond Terra Associates' purview. A <br /> building envelope specialist or contractor should be consulted to address these issues,as needed. <br /> 3.0 SITE CONDITIONS <br /> 3.1 Surface <br /> The subject site occupies the northeastern corner of the intersection of 2nd Avenue W and 100th Street SW in <br /> Everett, Washington. It is bounded to the north,east, and south by residential properties. The site is bounded to <br /> the west by 2nd Avenue W. The approximate location of the site is shown on Figure I. <br /> The site consists of an undeveloped, approximately 3.3-acre, irregular-shaped parcel. It is primarily vegetated <br /> with young deciduous and evergreen trees and scattered brush. Site grades slope very gently from west to east, <br /> with an overall vertical drop of about eight feet indicated on the Site PIan. <br /> An approximately two-foot.deep roadside ditch extends along the site's southwestern perimeter adjacent to 2nd <br /> Avenue W. Wetland areas lie within the site's eastern half. We observed standing water in the southern part of <br /> the wetland at the time of our site visit. <br /> 3.2 Soils <br /> We observed surficial, loose organic soils in each of the test pits excavated at the site. The organic soils consist <br /> of a one-foot thick topsoil/forest duff layer in Test Pits 1 and 6. A layer of loose, dark brown organic silty sand <br /> was observed in each of the remaining test pits to depths ranging from six inches to three feet. <br /> Directly underlying the organic soils, we encountered loose to dense silty sand in Test Pit 1,Test Pit 2,Test Pit 5, <br /> and Test Pit 6 to depths ranging from 2 to 4 feet. Underlying the organic soils in Test Pit 3,Test Pit 4,Test Pit 7, <br /> and directly beneath the silty fine sands in the remaining test pits are till-Iike soils consisting of dense to very <br /> dense silty sand with silt interbeds, cobbles, and variable gravel content. Each of the test pits were terminated <br /> within the till-Iike soils. <br /> Page No.2 <br />