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future settlement of the fill. The backfill should be placed immediately after the braced foundation walls aze able to structurally support the fill. Puddling or sluicing must be avoided. 3) The [op 2 to 3 feet of soil placed within 10 feet of the foundations should be impervious in nature to minimize infiltration of surface water into the wall backfill. 4) Roof downspouts and drains should discharge well beyond [he limits of all backfill. Roof overhangs, which project two to three feet beyond the foundation, should be considered if gutters aze not used. 5) Plastic membranes should not be used to cover the ground surface adjacent to foundation walls. Site Grading All of the fill materials placed beneath the floor slabs, driving areas or underground utilities should be uniformly placed and compacted to at least 95 percent of the maximum standard Proctor density and within 2 percent of the optimum moisture content as determined in accordance with ASTM D-698/AASHTO T- 99. The fill materials placed in these azeas should not contain boulders, topsoil, organics or other deleterious substances. Site grading should be cazefully planned to provide positive surface drainage away from all structures and driving areas. The building and driving azeas should be placed as high as possible on the site so that positive drainage away from these swctures can be provided. Surface diversion features should be provided azound parking areas to prevent surface runoff from flowing across the driving surfaces. We recommend that ume[ained cuts in [he natural overburden soils not exceed a 2(H) to 1(V) configuration. Steeper cut slopes in the bedrock aze possible, however, revegetation will be difficult on slopes steeper than 2(H) to 1(V). Where fills are required, we recommend that the fill slopes not exceed 2 (H) to I (V) configuration if they aze properly compacted and drained. All of the existing fill materials should be removed prior to placement of any new fill materials. Positive surface drainage should be provided around all permanent cut and fill slopes to direct surface drainage away from the slope faces. All cut and fill slopes and other stripped areas should be protected against erosion by revegetation or other methods. Limitations The recommendations given in this report aze based on the soils and bedrock materials encountered at [his site and our understanding of the proposed construction. We believe [hat this information gives a high degree of reliability for anticipating the behavior of the proposed structures. However, our recommendations aze professional opinions and cannot control nature, nor can they assure [he soils profiles lob Number: 07-7442 NWCC, Inc. Page 9