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Geotechnical Engineering and Geological Hazard Study <br />Lincoln Elementary School Modernization Project <br />Manteca, California <br />Page 4 <br />and estimated maximum earthquake magnitudes, M,,max. The locations of these faults relative to the site <br />are shown on Figure 5. <br />REGIONAL SIGNIFICANT FAULTS <br />ault distanceo Site aaz><mu Earhgnake3naz <br />_, �� ..�� _� -$ �� `� � _._. � _ a _ ♦ -� um�>a��I_ to e Y: <br />Great Valley 7 <br />23 <br />6.8 <br />Greenville - Connected <br />40 <br />7.0 <br />Great Valley 8 <br />40 <br />6.8 <br />Mt. Diablo <br />53 <br />6.7 <br />Ortigalita <br />58 <br />7.1 <br />Great Valley 5, Pittsburg Kirby Hills <br />60 <br />6.7 <br />Calaveras <br />61 <br />6.9 <br />Hayward - Rogers Creek <br />67 <br />7.3 <br />Concord - Green Valley <br />69 <br />6.8 <br />Great Valley 9 <br />79 <br />6.8 <br />Great Valley 4b, Gordon Valley <br />84 <br />6.8 <br />Monte Vista- Shannon <br />84 <br />6.5 <br />Quien Sabe <br />97 <br />6.6 <br />San Andreas <br />97 <br />8.0 <br />West Napa <br />99 <br />6.7 <br />Zayante-Vergeles <br />102 <br />7.0 <br />Great Valley 4a, Trout Creek <br />107 <br />6.6 <br />Hunting Creek-Berryessa <br />113 <br />7.1 <br />San Gregorio Connected <br />116 <br />7.5 <br />Great Valley 10 <br />118 <br />6.5 <br />Great Valley 3, Mysterious Ridge <br />123 <br />7.1 <br />Monterey Bay-Tularcitos <br />125 <br />7.3 <br />Rinconada <br />132 <br />7.5 <br />Great Valley 11 <br />137 <br />6.4 <br />Point Reyes <br />143 <br />6.9 <br />West Tahoe <br />155 <br />7.1 <br />Maacatna-Garberville <br />155 <br />7.4 <br />Carson Range <br />157 <br />7.1 <br />Deaggregation of the site specific probabilistic seismic hazards using the United States Geologic Survey <br />(USGS) web tools indicate the dominant seismic source has a modal distance of 24.0 km and a modal <br />magnitude M, 6.6 for a 475 year return period, which would best correlate to the Great Valley 7 Fault. <br />The deaggregation results are included in Appendix B. <br />The San Andreas Fault also poses a seismic hazard to the site, especially in the longer periods of the site <br />response spectrum. The San Andreas Fault is classified as a "Type A" seismic source based on its <br />potential to generate a maximum earthquake of M.8.0 and its estimated long-term slip rate of <br />24.0 mm/year. <br />5.0 SUBSURFACE CONDITIONS <br />Condor explored subsurface conditions at the location of the proposed buildings by means of eleven <br />borings (B 1 through B 11) drilled to depths ranging from 10 to 50 below the existing ground surface (bgs), <br />two borings (B1 and B8) were drilled to a depth of 50 feet bgs. The locations are shown on Figure 2, <br />Appendix A. The soil borings for the investigation were drilled on April 14 and 15, 2015 with V&W <br />• ra•- <br />