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When the 1994 Master EIR was prepared, it was not known that there was the Great Valley Fault Zone one mile west of the project site beneath the east foothills of the Diablo Range. The rupture surface of the nearest segment of the Great Valley Fault Zone, a system of northwest-trending concealed ("blind") thrust faults, lies at depth and does not usually extend to the ground surface. This fault system has only recently been recognized as a potential source of earthquakes. Nevertheless, the mitigation measures identified to reduce ground shaking and to minimize seismic risks, as identified in the 1994 Master EIR, would still apply to the project. Seismic risks are not significantly greater based on this new information. The updated traffic study prepared as a part of the Initial Study incorporated newly generated information on cumulative growth related to residential buildout and employment for the 2010 analysis year of the MEIR. The new cumulative growth information was prepared in May, 2000 by the Community Development Department to address recent, updated San Joaquin Council of Government (SJCOG)housing and employment projections. The new information showed lower increases in projected regional residential development and employment for 2010. The new information does not result in significant effects not discussed within the MEIR, or impacts that are substantially more severe. Direct project traffic impacts are essentially unchanged and regional cumulative traffic impacts are essentially similar or of lower impact than the 1994 Master EIR. The independent traffic study prepared by Dowling & Associates for the Initial Study found substantial decreases in freeway and highway traffic on 7 of the 9 segments evaluated and small increases on two segments. All freeway/highway segment levels of service remained the same or improved in comparison to the MEIR traffic analysis. Of the 24 arterial road segments evaluated, 11 had similar levels of service, 11 had improved levels of service, and two, Grant Line Extension and Tracy Boulevard north of Lammers Road, had decreased levels of service. The few road segments with lower levels of service can be mitigated with measures similar to that proposed in the MEIR. The proposed Grant Line Road Extension which is currently projected to have LOS "D" in comparison to prior MEIR projections of LOS "C" can be mitigated by amending the LOS standard from "C"to "D"as was done for Grant Line Road within Mountain House, or by widening the road from four to six lanes. A portion of the proposed roadway within one-quarter mile of 1-205 already is designated for a LOS "D" standard under the Tracy General Plan. Tracy Boulevard north of Lammers Road is projected to decrease in Level of Service from LOS "C"to LOS "D" in A.M. and LOS "E" in P.M. This impact can be mitigated by adding the roadway to the San Joaquin County Traffic Impact Mitigation Fee (TTMF) program at the appropriate time for widening from two to four lanes. The added mitigation measures are to be incorporated into the environmental documentation for the Neighborhood F Project which will be tiered onto the MEIR. As such, there are no new significant effects or more severe significant effects related to regional, cumulative traffic growth sufficient to affect the adequacy of the 1994 Master EIR and require a supplemental or subsequent EIR. 30