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GEOTECHNICAL ENGINEERING STUDY <br />JMD Architecture <br />,Qpril 19, 1999 <br />Ground Motion Response <br />E-8689 <br />Page 8 <br />The 1997 UBC Earthquake regulations contain a static force procedure for design base shear <br />calculations. Based on the encountered soil conditions it is our opinion soil profile type S�, <br />Very Dense Soil and Soft Rock, as defined in Table 16-J, should be used to characterize the <br />site soils. <br />Excavations and Slo�es <br />The following information is provided solely as a s�rvice to our client. Under no <br />circumstances should this information be interpreted �o mean that ECI is assuming <br />responsibility for construction site safety or the contractor's activities; such responsibility is <br />not being implied and should not be inferred. <br />In no case should excavation slopes be greater than the limits specified in local, state and <br />Federal safety regulations. Based an the information obtained from our field exploration and <br />laboratory testing, the native silty sand with gravel would be classified as Type B by OSHA. <br />Temporary cuts greater than four feet in height in Type B soils should be sloped at an <br />inclination of 1 H:1 V. If slopes of this inclination, or flatter, cannot be constructed, temporary <br />shoring may be necessary. <br />Shoring will help protect against slope or excavation collapse, and will provide protection to <br />workers in the excavation. If temporary shoring is required, we will be available to provide <br />shoring design criteria. <br />Site Drainage <br />No groundwater seepage was encountered in our borings. As such, we do not anticipate <br />groundwater seepage will be encountered in the building excavation or utility excavations. <br />However, if unanticipated seepage is encountered the bottom of the excavation should be <br />sloped to one or more shallow sump pits. The collected water can then be pumped from <br />- �;.:ts to a positive and permanent discharge, such as a nearby storm drain. Depending <br />�tie magnitude of such seepage, it may also be necessary to connect the sump pits by a <br />s�-stem of connector trenches. <br />Eerth Consuhente. Inc. <br />