6400 36TH AVE W 2018-01-02 MF Import

A 9xyH� CHZ� �C :Z H� ^ M CA H Hz hd DAMES & M�JORE �rxt,tt.,,,,,,: �, o OH�t @ p The Boeing Company O" C� August 2, 1989 3 9 Page 3 H H H gco t Ground water was not encountered in any of the backhoe pits. C C rA M As access was restricted, ;t was not possible to excavate a backhoe pit in the tennis court 1-9 y ! area. Inspection of a recently formed road cutting 3 feet high adjacent to the tennis court 1-3 0 area revealed similar soils to those in the backhoe pits. j LABORATORY TESTING - Laboratory tests were conducted on representative disturbed samples obtained from the I backhoe pits. The test results are summarized on Plate 3A to 3D. 3 RECOMMENDATIONS AND CONCLUSIONS --. jGeneral : Based on the results of our investigation, it is our opinion that the I ��jr proposed site can be readily developed for support of the proposed facility. The recreation — i building can be safely supported on shallow footings founded on native soils or engineered fill provided our recommendations pertaining to site preparation and fat placement are followed. r " Site Preparation and Fill Placement Prior to site grading, all areas subject to cutting or filling should be cleared and stripped of all surface vegetation, tree roots, and organic topsoils. We anticipate that removal of the surface vegetation and topsoil may require r.� stripping and excavation of approximately 6 to 8 inches with deeper excavation required to = remove tree root structures. In addition, any soils with significant organic content _ immediately beneath the topsoil should be excavated. All cleared and stripped materials should be removed from the project area. Any surface water in low-lying areas should also v ' be removed. I After cut areas have been graded and prior to placing material in fill areas, we recommend that the exposed subgrade soils be thoroughly proofrolled with a piece of heavy construction equipment (such as a loaded dump truck) to identify any soft or loose areas. Soft zones thus identified should be stripped and removed at the direction of a Dames & 1=1=� Moore representative. The subgrade should be re-established by backfilling with clean well - graded sand or sand and gravel compacted to 95 percent of maximum density based on ASTM Test Procedure D-1557. After site preparation has been completed in accordance with the above recommendations, I filling operations may then proceed. All fill should be placed in lifts not exceeding about 8 inches in loose thickness and conditioned to within 2 percent of the optimum moisture content. Each lift should then be compacted to a minimum of 95 percent of the maximum 3 t