FIELD DOCUMENTS - Laserfiche WebLink

Home Browse Search

El Dorado Apartments April 19, 2002 File No. 1754-006 Page 2 e SITE CONDITIONS SURFACE The approximate six-acre property fronts on the easterly side of El Dorado Street just southerly of the Stockton Municipal Baths(McKinley Park). The Stockton Flea Market is to the south. There are low green volunteer grasses over most of the site. Ground surface elevation is on the order of+14 feet. There also are several trees relatively near the southerly property line. We understand that the site once supported the facilities of Patterson Glass Company. SUBSURFACE All eight borings encountered fill materials at ground surfaces and extending to depths ranging from two to eight feet; the average fill depth is slightly more than five feet. The fill materials range in composition from slightly silty sands to heavy clays. The fill materials contain gravel and brick rubble and most notably two to three inch rounded pieces of glass. Fill consistencies are medium stiff to hard and very loose to medium dense. The uppermost native soils generally consist of silts and clays of low to moderate plasticity, although high plasticity clays were encountered locally. Consistencies of these silt and clay materials are at least stiff and more commonly very stiff and locally hard. The stiff silt and clay deposits generally extend to the maximum j; 15-foot depth of our exploration. In the case of Boring 7, medium dense sands were encountered beneath an approximate nine-foot thick stratum of very stiff silt;the silty sands are indicated to extend to the maximum 15-foot depth of the Boring. No free groundwater was encountered in our borings. BEARING CAPACITY Although the consistencies of the fill materials encountered within the upper two to eight feet of the property appear favorable, composition is erratic and it must be assumed some discontinuities exist. Remedially reworked fill materials are considered capable of supporting lightly loaded conventional spread footings. EXPANSIVE SOILS i Existing fill materials contain some high plasticity clays locally. Moderate plasticity clays are more prevalent and it should be possible to construct building pads excluding high plasticity clays. Never the less, soil expansion will be a factor in design. Procedures commonly used to reduce expansive soil effects on floor slabs include: slab reinforcement and presaturating subgrade soils prior to concrete placement,removal of expansive clays and replacement with silts or sands to provide a nonexpansive layer on the surface of the building pads,and treating the expansive clays with lime to chemically reduce expansive tendencies. In the case of this project, it would appear most reasonable to address soil expansion via pre-saturation and reinforcement. I I I