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1004 -18 <br /> FIELD REI'10*9� coq It`ou� 1 <br /> Mq y ? <br /> Project: 79'h Place A40iNo� �s 1t7��c ""O 2912 <br /> Cornerstone cCJJ LI D <br /> Geotechnical, Inc. Owner: Cascade TestingC w0� c: 2010-4-26 <br /> A Division of Robinson&Noblc,Inc ��p <br /> 176251301'Avenue NE C102 Location: Everett Report No: I <br /> Woodinville,WA 98072 Weather: Overcast Page: 1 of 2 <br /> Purpose of Subgrade evaluation <br /> Phone: 425-844-1977 Visit: <br /> Fax: 425.844-1987 By: JRW <br /> We were onsite at the request of Pat,with American Home Builders,for the purpose of evaluating <br /> foundation subgrade for the residential addition located at 117—79'h Place SE in Everett. <br /> We observed that foundation preparation had begun for the residential addition located on 79'h Place SE. <br /> The contractor had excavated down to planned footing subgrade elevation of the addition in the <br /> northwest region of the site. Foundation preparation had not begun for the southeast region of the site at <br /> this time. We observed that the excavation was approximately 8 to 18 inches in depth. <br /> We probed the subgrade with a half inch diameter steel probe rod and the probe rod penetrated from 2 <br /> inches to 3 feet in depth and location of excessive probe depth appeared to random. We evaluated the <br /> subgrade soils as previously placed fill. We have not been provided with documentation on how the fill <br /> was placed or if density testing had occurred. <br /> It is our opinion that the old fill should be removed prior to placement of footings, It is not known at <br /> this time how deep the fill extends. Further explorations should be performed to evaluate the depth of <br /> old fill. These explorations could occur at the time of subgrade overexcavation. We expect,due to site <br /> topography, that fill could be on the order of I to 4 feet for the addition located on the western side of <br /> the existing structure. <br /> Planned slab subgrade for the addition on the western side of the existing structure consists of <br /> undocumented fill as well. There is some risk of settlement underlying this slab with undocumented fill <br /> conditions and probe depths discussed above. The owner of the property should evaluate if this risk is <br /> acceptable. <br /> Attachment: Signed: <br /> Distribution: <br /> OI/Z <br />