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migratory fish in North Fork of the South brancli of Little Johrrs Creel:. This issue is analyzed in the Supplemental EIR. e. Potentially Significant Impact: The proposed landfill expansion would be required to comply With Cotunty tree preservation ordinances. 1-his issue i5 anal.°zed in the Supplemental EIR. f. Potentially Significant lnnpact: The proposed landfill expansion could conflict with the San Joaquin County MSCP habitat conservatio.rr plan. This issue is anal zed in the Supplemental EIR. a E V. CULTURAL RESOURCES a. No Impact: As stated in the EIR,no historical resources were found by a records search or the site survev. b. Less than Significant with Mitigation Incorporati011: Although, as stated in the EIR, no x archaeological resources were found by a records search or the site survey, the site especially the North Branch of tine South Fork of Little Jahns Creek, may have subsurface cultural ✓ deposits. Mitigation Measures E..1 .(a), (b), (c), and (d) of the Mitigation Monitoring/Report ilg Program, regarding archaeological inyestigatiorns of any cultural resources discovered during construction, would mitigate the impacts to a less-than-significant level. c. No Impact: No unique paleontological resources or unique geologic .Features exist on the site. d. Less than Significant with Mitigation Incorporation: Although, as stated in the EIR. no i Fi human remains were found by a records search Or the site sure e�, the site mai have subsurface human remains. Mitigation Measures E.1 .(a), (b), and (c) of the M.itigatiun Monitoring/Reporting Program, regarding treatment of liunian remains discovered during construction, would mitigate the impacts tri a less-than-significant level. V1. GEOLOGY AND SOILS a. Less than Significant Impact x-vith Mit.i ation Incor}oi ti n Acc dzlg to the DE1R (p. 111.J.6) the project site is not within the rupture zone of any known active or potentially active Fearthquake fault. It is near the inferred trace of the Trace-Stockton fault, however this fault has not had appreciable movement for 5 million yea rs or m(.)re. Seismic shaking could result in 1 peak bedrock acceleration of 0.18 g (DEIR, p-'111+13). This couid.disturb landfill slope stability, drainage features,liner integrity, and induce landfill settlement over the project life and after F closure. Liquefaction is unlikely (except possibly near the creek) due to the depth of groundwater and lack of sandy soil layers. Revisions by the CDGM in their method of calculating maximum credible earthquakes and peak accelerations,probable and potential seismic impacts have occurred since the 1994 Austin Road Landfill EIR. The 1999 Uniform Building Code, Chapter 16 (earthquake regulations) presents the maximum magnitude, seismic coefficient for acceleration and seismic coefficient for velocity. The seismic coefficients are based + on the soil profile types and distance of the site form the faults of a given maximum magnitude. These new designations will be accounted for in the final seismic design.. Seismic impacts also would be mitigated to a less-than-significant level by implenientation cif Mitigation Measure J.4 of the Mitigation Monitoring/Reporti.ng Program. I b. Less than Significant Impact v' g pact� rth Mrtrgatran Incorporation: Soil erosion is discussed in Impacts K.1 and K.4 of the.EIR. Erosion could occur in the realigned North Branch of the South -21- F