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--6- 2P2/386/61--1 <br /> Groundwater data (USGS WSP 619 , 1930) indicate free groundwater <br /> 4 <br /> surface to b;a- at less than 10 ft depth on the site with a- gentle <br /> southwesterly gradient. Monitor well levels showed seasonal varia- <br /> tions on the order of 5 ft . <br /> No active faulting has been mapped on or near the site and no <br /> I <br /> indications of active faulting have been observed in the course of <br /> study. Earthquake events on several active faults may subject the <br /> site to significant ground shaking . Table-1 below lists four selected ] <br /> active faults , their distances from the site , a maximum credible event <br /> magnitude , and estimated ground acceleration at the site resulting <br /> from the maximum credible event . <br /> TABLE-1 <br /> 4 <br /> E <br /> Approximate Maximum Estimated Ground Acceleratior. <br /> Distance Credible Due to Maximum Credible <br /> Fault from ' Site Event Earthquake <br /> (miles) (Richter (g) <br /> Magnitude) <br /> Foothills Fault <br /> .Zone 32 (east) 6. 5 0. 08 <br /> -Antioch Fault 24 (west) 6.75 0 .13 <br /> Greenville Fault 27 (west) 7. 25 0.15 <br /> Calaveras Fault 38 (west) 7. 5 0 .13 <br /> 0.10 <br /> San Andreas Fault 64 (west) 8. 25 <br /> Fes.. <br /> f <br /> G <br />