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t i � CHAPTER 1 INTRODUCTION This Initial Study evaluates the proposed Tentative Subdivision Maps for Neighborhoods K and L within the larger Mountain House community (Application No. PA-1000266 and PA-1000267). The applicant,Shea Mountain House, LLC, has submitted planning applications to the San Joaquin County Community Development Department(SJCCDD),the lead agency for the approval of this project. This project would be part of Specific Plan II (SPIT),the second major phase of the development identified in the Mountain House Master Plan Final EIR,which is a Master EIR(adopted in 1994 by the San Joaquin County Board of Supervisors and referred to hereinafter as the"1994 MEIR"). SPII was approved in 2005. The 1994 MEIR, incorporated herein by reference, can be reviewed at the San Joaquin County ' Community Development Department, 1810 East Hazelton Avenue, Stockton, California. A copy of SPII can also be reviewed at this County office. Mountain House is a master community located on a 4,780-acre site near San �- Joaquin County's border with Alameda County, northwest of the City of Tracy (see Figure 2-1). The Mountain House Master Plan land use map(Figure 3-1, Master Plan Designations)is the General Plan Community Pian 2010 map for Mountain House. Ultimate buildout of the community is projected to include a ! resident population of about 42,000 persons and jobs for about 22,000. Buildout of SPII would accommodate about 24,900 of the projected total Mountain House population of 42,000. Currently, approximately 3,000 residential dwelling units and other uses(including office and retail, schools, and other civic facilities) have been developed in the community. Neighborhoods K and L would be the final residential development within the project. f The purpose of this Initial Study is to determine whether the proposed project is "within the scope"of the 1994 MEIR and to examine the continued adequacy of the 1994 MEIR. This Initial Study assesses whether 1)there are any additional significant environmental effects not previously examined in the 1994 MEIR,2) any new mitigation measures are required, and 3)any substantial changes have occurred with respect to the circumstances under which the 1994 MEIR was certified or whether there is new available information that was not known and could not have been known at the time the 1994 MEIR was certified such that !_f major revisions of the previous 1994 MEIR would be required (CEQA Guidelines Sections 15176, 15177, and 15179). A"substantial change"must involve new significant environmental effects or a substantial increase in the severity of previously identified significant effects(CEQA Guidelines Section 15162). The Initial Study also assesses whether there are any additional environmental impacts that may require further mitigation that were not previously addressed in i I �srrriil 1-1