ARCHIVED REPORTS_2011 - Laserfiche WebLink

Home Browse Search

File No. 20-3855-O1.GO1 h4 K L E t N F E L D E R May 3, 1995 In addition, two Resistance-Value (R-Value) tests were performed on samples of the near- surface soils for use in pavement sections design. The R-Value test results are discussed in the "Pavement Sections" subsection of this report and are presented on Plates A-11 and A-12 of ' j� the appendix. i VII. CONCLUSIONS AND RECOMMENDATIONS 1. General The major concern on this site from a geotechnical standpoint is the presence of significant amounts of uncontrolled fill and debris. In addition,an extremely large pit up to approximately 15 to 20 feet deep, or deeper, is present near the center of the site that will have to be t backfilled. However, it is our opinion that the site can be developed as a subdivision provided i the recommendations presented in the following subsections of this report are followed. It is our opinion that the concrete portions of the debris can be buried in proposed Engineered Fills provided they are below the depth of any proposed or future possible excavations. With the site graded as recommended in the following subsections, it is our opinion that the residences can be constructed on foundations bearing on properly compacted Engineered Fill soils. The following subsections present our recommendations for site preparation and grading, foundations, support of concrete slab-on-grade floors, and pavement sections. Ankh 2. Site Preparation and Grading Site preparation should include the stripping and removal of an vegetation and debris from the areas of proposed construction or to receive Engineered Fill. Stripped vegetation and non- concrete debris should not be incorporated in any of the structural fills. Concrete debris that will be buried in the deeper portions of the fills can be stockpiled on the site. The actual depth of stripping should be determined in the field by a representative of our firm. All disturbed soils and debris present in the pit should also be overexcavated and removed prior to backfilling the pit. As noted, standing water was present in the pit at the time of our field explorations; therefore, dewatering may be required prior to backfilling of the pit. The concrete slab present at the southwest portion of the site can be broken in place and the pieces stockpiled for use in deeper fills, if desired. We understand that it is planned to excavate approximately 2 to 3 feet of the existing fill area . in order to reach rough site grade. We recommend that all fill and debris be overexcavated to at least 4 feet below all proposed finished building pads in order to remove all loose soils and debris from the zones of foundation and residence utility construction. Consideration should also be given to overexcavating in areas of proposed subdivision underground utility construction to create easier trenching conditions. After stripping and removal of vegetation and debris and completion of excavations and overexcavations, all voids left by the removal of underground utilities or any other buried objects should be overexcavated to stable soil, the upper 5 feet of the exposed fill adjacent to Copyright 1995 Meinfelder,W. Page 4 or to