3723 RUCKER AVE Geotech Report 2018-01-02 MF Import

� � No subsurface seepage was noted in the test pits during our study. We anticipate tha[ a�aapage would be observed in the subsoils during wettei periods of the year after periods of rainfall. DISCUSSION AND RECOtR�tENDATIONS General Based on our study, we conclude that the proposed building may be constructed na planned, provided the recommendations presented in tl�is report are incorporated into tiie project design end construction. The primary geotechnical feature that will affect the proposed construction is the presence of as much as 13.5 feet of loese fill beneath the building area. In addition, a recently censtructed rockery with a maximum height of about four feet is present along r:he north and east sides of the site, adjacen[ to the planned building walls at [hese locations. The existing fi11s present on the site will not provide adequate support for the building without undergoing considerable differentiel aettlemen[s. In addition, shnllov fomidations may impose excessive pressures on the existing rockery which may collapse under these pressures. The proposed buildings mey, however, be supported on conventional spread footings and slab-on-&rade floora bearing on a structural fill mat after overexcavating at lenst two feet below foundation areas. Other geotechnical factors to be taken into consideration in the design and construction of the building are as follovs: 1. Foundations for the building should be extended down to a level below that of the base of the rockery. In this manner, founda[:on loads ahould not affect the rockery. It is possible that the rockery may collepse et the time [hat excavations a*e being made to ex[end the building foundations below [he level of the rockery. If [his occurs, the foundation xall will need to 6e designed as a retaining wall along the north and east sides of [he building. 2. The exis[ing fills should be removed to a minimum depth of two feet bel�w foundation bottoms and replaced by structural fills. In slab and pavement areas, the dep[h of overexcavation should be at least 12 inches. 3. Building :oundations may be constructed as conven[ional spresd footings supported on structural fill soils. Floors may be constructed as slabs-on-grade supported on structural fill. 4. The existing fill soils con[ain large amoun[s af debris and it is un7ikely that it will be possible to reuse these soils as structural fills on the site. Hence, it is recommended that you plan to impor[ all structural fills that will be rzquired on the site. This report has been prepared for specific applica[ion to this project in accordance with generally accepted geotechnical engineering practices for the exclusive use of Norwestco and their representatives. No other warranty, expressed or implied, is made.