832 RUCKER AVE 2016-01-01 MF Import

� Proposed Modification to Ihe Resid�nce o( Joel 8 Kathy Larsen February 12, 2004 Everelt, Washington ORA Project Number: 04-065•?eport 7 � I 6.4 Earthwork The recommendations presented in this report are predicated on ful illment of the following earthwork recommendations. 6.4.1 Site Clearing: Any existing vegetation, loose gravel fill, and any c ther deleterious materials should be removed from the project area prior to construciion. After site clearing and stripping, the exposed surfaces should be graded relatively flat to allow for proper subgrade preparation but sloped slightly to allow good surface drainage during construction. 6.4.2 Excavations: According to Chapter 296-155, Part N of the Safetv Standards for Construction Work in the State of Washinqton, the site soils classify as Type C soils. Therefore, side slopes of excavations deeper than four (4) feet should be no steeper than one and one-half (1'/z) horizontal to one (1) v_ertical (1'/�H:1V). If the dimensions of the site prevent the use of maximum sl��pes of 1'/zH:1 V, the slopes must be stabilized or shored to facilitate safe excavations. The geotechnical engineer should be contacted for additional recommendations if such techniques are going to be employed. 6.4.3 Drainage: Good drainage is considered critical to the performance of earth- supported structures such as foundations, slabs-on-grade, and retaining walls. Accordingly. we recommend that an under-fl�or drain system be installed as described earlier in �he report, and a perimeter drain-system consisting of a perforated pipe surrounded by free-draining gravel be i�istalled. The gravel should be separated from the surrounding soil by a filter fabric. The collected water should be tight-lined away from the building to a suitable discharge system. Roof and surface drains should be provided but they should not be connected to the footing-drain system. 6.4.4 Materials: In general, native site soils are not suitable for use as backfill or structural fill on this site. If additional material is required to meet site grade, it should be imported, conform to the gradation presented in Table 6.1, and be approved by the geotechnical engineer prior to use. Samples must be submitted to the geotechnical engineer at least 72 hours before approval is required and before the materials are used. Otto Rosenau 8 Associates, Inc. Page 9 of 13