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1-30 <br />m <br />9Ht:o <br />k�n <br />H <br />ti H <br />R�z d <br />ON <br />Rig <br />t H <br />HH <br />g� H <br />o�tn <br />F3W <br />H O to <br />t <br />DAMES S MOORE ::...: <br />The Boeing Company <br />August 4, 1989 <br />Page 2 <br />SCOPE <br />The purpose of our geotechnical investigation is to provide recommendations regarding <br />site preparation and support of the proposed facility and includes: <br />1. Expioration of soil conditions by excavating four backhoe pits in the area. <br />2. Laboratory testing to evaluate characteristics of the soils. <br />3. Recommendations regarding site preparation, fill placement and compaction. <br />4. Recommendations regarding foundation support of the proposed building. We <br />include recommendations for allowable soil bearing pressures for footing design, <br />minimum footing width and depth requirements and estimates of foundation <br />settlements. <br />5. Recommendations regarding support of floor slabs and pavements including <br />modulus of subgrade reaction "K" and CBR values. <br />6. A written report containing our findings and recommendations. <br />i <br />SUrcURFACE CONDITIONS <br />Four backhoe pits (G-I to G-4) were excavated on July 3, 1989 to assess subsurface <br />conditions. The pits were excavated to depths between 6.5 feet and 12 feet. Locations of the <br />backhoe pits arc shown on Plate 1. Logs of the pits are presented on Plates 2A and 2B. <br />An experienced engineering technician from our office classified the soils and logged <br />each backhoe pit. Soils were classified in accordance with the Unified Soil Classification <br />System which;s described on Plate 2C. Due to the dense vegetation, access was restricted. <br />In our opinion sufficient coverage of the site was obtained using the existing tracks. <br />Disturbed bulk samples of the soils were taken from the pits for laboratory analysis. <br />The subsurface soils are characterized by: <br />Brown silty fine to medium sand occasional gravel and some roots. The upper 6 <br />inches is highly organic. This material is medium dense and extends to a depth of <br />between 1.5 feet in Pit GI to 3.0 feet in Pits G2, G3, G4. This is underiain by: <br />Gray glacial till. The till is dense to very dense, variably weathered and cemented <br />and classifies as silty fine to coarse sand with some gravel. The till extends to the limit <br />of the backhoe pits between a depth of 7 feet and 12 feet. The glacial till is characterized <br />by high strength and very low compressibility. <br />