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-'1 <br />Repon of Soils Investigation <br />2215 South Standard Ave., Proposed Addition <br />Santa Ara^ Califomia <br />Page 5 of 27 <br />Job No. 40-0613 <br />Aoril 5. 1999 <br />-t <br />I <br />I <br />I <br />I <br />.1 <br />6.4 "Disturbed" Soil Sampling <br />Disturbed samples of the near surface soils were obtained at selected intervals in the <br />borings using a split barrel sampler during standard penetration testing. The steel <br />sampler was driven into the bottom of the borehole with successive drops of a driving <br />weight. Blow counts required for one foot of sampler penetration are shown on the <br />boring logs in the column "blowVfoot." The soil was retained in plastic bags for <br />determining soil moisture content and soil identification testing. Bulk samples of site soil <br />were secured between 0-5 fbg in borings 1,3, and 4 and retained for laboratory testing. <br />6.5 Standard Penetration Testing <br />Standard Penetration Tests (SPT) in accordance with ASTM D 1586 were performed at <br />selected depths using a standard (1 4 in ID, 2-inch O.D.) split barrel sampler. The driving <br />hammer of the SPT samples was a 140-pound weight falling 30 inches lor each blow. <br />The recorded blow count (N) for one foot of sampler penetration after 6 inches of seating <br />penetration is shown on the boring logs in column "blows/foot." The standard <br />penetration test provides rough estimates of many properties of soil in-situ. Primarily <br />rough estimates of relative density and lriction angle of uncemented, non-collapsible <br />granular soils and unconfined compressive strenglh ofclays. <br />6,6 Boring Logs <br />Logs of the borings for the investigation are presented in Appendix B on boring log <br />summary sheets, which also include descriptions ol soil, field density data and <br />supplementarv laboratory data. Boring locations can be lound on Figure 2. <br />I