15 ATTACHMENT 9 - Laserfiche WebLink

Project No. 9929.G Geotechnical Investigation/Vineyard Avenue, Pleasanton 8 August 2003 Excavations 15. Our field investigation has revealed that the Livermore Gravel materials that underlie the majority of the site are generally rippable with conventional equipment (rubber tire backhoe or larger). However, it is noted that localized areas of harder material maybe encountered in some of the hill areas, especially on the estate lot where steeper more resistant terrain is present. The assessment of rippability of the bedrock is difficult to quantify as it depends on many factors including: equipment type, area of operations (mass grading or trench situation), and certain material properties (such as rock strength, rock type, the •nature and frequency of defects, and seismic velocity). An evaluation of rippability of the deep cut will be made when the additional boring is advanced. Materials Usage 16. With regard to filling operations, all subsurface materials encountered during our investigation, except those within the top few inches of predominantly organic plant would be suitable for use as engineered fill when placed and compacted at the recommended moisture content. 17. Import material is not expected, however, should import material be used. to establish the proper grading for the proposed development, the import material should be approved by the Soil Engineer before it is brought to the site. Import material may be of any type but should not be more expansive than the on-site soil for the foundation recommendations presented below to be applicable. If the import soil is more expansive than expected, then the foundation recommendations presented in this report will change and additional foundation design criteria will need to be provided. TERRASEARCH, inc. Page 15 of 53