Laserfiche WebLink
Report of Soils Investigation <br />2215 South Standard Ave., Proposed Addition <br />Sent: .qna. California <br />Page 13 of27 <br />Job No. 40-0613 <br />April 5. 1999 <br />I <br />-l <br />I <br />l <br />Liquefaction assessment olthe underlying deposits at the site indicated that the potential <br />for liquefaction is considered high due to the physical grain size distribution, in-place <br />density, depth to groundwater, and the location ofthe site in a liquefaction zone. <br />9.2 Compressive Soils <br />Based on observation and laboratory testing, underlying soils materials exhibit low <br />compressibility characteristics and are considered suitable for structure support. Any <br />loose surficial materials should be removed beneath structure pad areas and reworked <br />(10.2.4). All grading or treatment of these soils should be performed under the <br />observation of a qualified geotechnical representative. <br />9.3 Expansive Soils <br />Near surface soils encountered during the subsurface investigation were generally found <br />to consist of silt with sand to approximately 2 Ibg and underlain by a lean clay. These <br />materials were found to have a low potential for expansion. The expansion index for the <br />site soil was determined to be 17. Should expansive clayey soils be exposed during <br />grading, modified earthwork and loundation recommendations may be warranted. <br />9.4 Sulfate Resistance <br />Moderate to high levels of sulfate containing solutions or soil can have a deleterious <br />effect on the in-service performance of concrete foundations and reinforcement steel. In <br />order to evaluate the loundation environment, a sample of the site soil was tested for <br />soluble sulfate and pH. The test results rvere 0.957 and 7 19 respectivel)'. Review olthe