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J. H. KLEINFELDER & ASSOCIATES <br />File No. S-1008-35 <br />May 17, 1985 <br />Page 7 <br />The information shown on Table I for the Melones and Bear Mountains faults represent <br />the main fault trace cn which the maximum credible earthquake is most likely to occur. <br />The above analysis indicates there is a potential for peak bedrock accelerations as high <br />as 0.28g, based can a maximum credible Richter magnitude 6.5 earthquake occurring on the <br />Bear Mountains fault approximately 12 miles from the site. Based on past history, the <br />potential for a 6.5 magnitude event on the Bear Mountains fault, is very low. <br />FIELD EXPLORA71ONS <br />The field explorations for this study included drilling and sampling six exploratory <br />borings. The approximate locations at which the test borings were made are shown on the <br />Site Plan, Plate II. The borings were drilled using 7 -inch diameter hollow stem auger <br />L <br />.e <br />TABLE <br />I <br />Estimated Peak <br />Closest <br />Maximum <br />Maximum <br />Bedrock Acceleration <br />Distance <br />Credible <br />Probable <br />(g) Based on Maximum <br />of Fault to <br />Fault <br />Earthquake* <br />Earthquake* <br />Credible Earthquake <br />Site (mi.) <br />San Andreas <br />8.3 <br />8.0 <br />0.06 <br />83 <br />Sierra Nevada <br />8.3+ <br />8.0 <br />0.05 <br />140 <br />Hayward <br />7.5 <br />7.0 <br />0.07 <br />65 <br />Calaveras <br />7.5 <br />7.0 <br />0.08 <br />58 <br />Midland <br />7.0 <br />6.5 <br />0.11 <br />37 <br />Melones <br />6.5 <br />0.23 <br />16 <br />Bear Mountains <br />6.5 <br />0.28 <br />12 <br />*Richter Magnitude <br />The information shown on Table I for the Melones and Bear Mountains faults represent <br />the main fault trace cn which the maximum credible earthquake is most likely to occur. <br />The above analysis indicates there is a potential for peak bedrock accelerations as high <br />as 0.28g, based can a maximum credible Richter magnitude 6.5 earthquake occurring on the <br />Bear Mountains fault approximately 12 miles from the site. Based on past history, the <br />potential for a 6.5 magnitude event on the Bear Mountains fault, is very low. <br />FIELD EXPLORA71ONS <br />The field explorations for this study included drilling and sampling six exploratory <br />borings. The approximate locations at which the test borings were made are shown on the <br />Site Plan, Plate II. The borings were drilled using 7 -inch diameter hollow stem auger <br />L <br />.e <br />