Laserfiche WebLink
Our Job B1-20-00 Page 8 <br />1.23 <br />in the upper clean sand stratum (SP-Sl'1). Ground water <br />may be encountered at six to 11 feet below existing grade. <br />Shrink-Swe1l. Based on the results of field and <br />laboratory tests, we estinate that the change in volune due <br />to excavation and reconpaction of the on-site fill soil to <br />an average of 93 percent will be on the order of 20 percent. <br />The change in volume of alluvial soil under similar grading <br />conditions is estinated to be on the order of 15 percent. <br />1.30 SEISNIICITY <br />Seismicity presents no unusual hazard to the <br />sitei i.e., unusual when compared to the rest of the southern <br />California area. Although the site wiLl be comparatively <br />responsive to earthquake excitation, the probability of <br />ground rupture is extrenely remote, and the site is not vu1- <br />nerable to liquefaction under limited vibration conditions. <br />Dynamic consolidation and ground shaking are the two con- <br />ditions which must be considered in evaluating the response <br />of the site to earthquake vibration. <br />Seismograms close to the epicenter of an earth- <br />quake are generally rich in short period (high frequency) <br />vibration. The relationship between vertical and horizontal <br />components of ground acceleration at a given site depends <br />on (1) the type of fault movement, (2) the depth of the <br />earthquake below the ground surface, and (3) the distance