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PHASE ENVIRONMENTAL SITE ASSESSMENT REPORT NEIGHBORHOOD G 20001 & 20043 MOUNTAIN HOUSE PARKWAY AND SOUTH OF BYRON AND WEST OF MOUNTAIN HOUSE PARKWAY PORTIONS OF ASSESSOR'S PARCELS 209-050-06,209-050-02,209-040-12,AND 209-040-13 TRACY,SAN JOAQUIN COUNTY CALIFORNIA 1.0 INTRODUCTION Trimark Communities, Inc. (Client) retained Condor Earth Technologies, Inc. (Condor) to conduct an American Society for Testing and Materials (ASTM) Standard E 1527-00 Phase I Environmental Site Assessment (ESA) for portions of the properties (Site) designated by Assessor's Parcel Numbers (APN) 209-050-06 and 209-050-02 located at 20001 and 20043 Mountain House Parkway (formerly Patterson Pass Road), and APN 209-040-12 and 209-040-13 located south of Byron Road and west of Mountain House Parkway, in Tracy, California (Figures I and 2, Appendix A). The Site consists of approximately 240 acres and is being considered by the Client for a residential development. This ESA was performed in accordance with ASTM E 1527-00, Standard Practice for Environmental Site Assessments: Phase 1 Environmental Site Assessment Process. Included is a discussion of the purpose and scope of work of each assessment; a description of the Site and of adjacent properties; a discussion of the information gathered from records; interviews and Site visits; and Condor's findings and conclusions. All figures referenced in the report are included in Appendix A. The results of research into ASTM- recommended government databases, conducted by Environmental Data Resources, Inc. (EDR®), are contained in Appendix B. Site photographs are contained in Appendix C. Site inspection questionnaires are located in Appendix D. Aerial photos and historical topographic maps provided by EDRO are located in Appendix E. A copy of the Preliminary Title Report supplied by Trimark Communities, Inc. is included in Appendix F. Copies of Pesticide Use Reports obtained from the San Joaquin County Agricultural Commissioner's Office are contained in Appendix G. A glossary of terms associated with an ASTM Phase 1 ESA is contained in Appendix H. 1.1 PURPOSE The purpose of the ASTM Phase I ESA is to conduct an appropriate inquiry into the previous ownership and uses of the property to help in partially satisfying the innocent landowner defense to Comprehensive Environmental Response, Compensation and Liability Act (CERCLA) liability and to identify "potential environmental conditions that could materially impact the operation of the business associated with the parcel of commercial real estate"(ASTM Standard Practice E 1527-00, Section 5.5). The goal of the ESA is to identify recognized environmental conditions and historical recognized environmental conditions. • The term recognized environmental condition means the presence, or likely presence, of hazardous substances or petroleum products on a property under conditions that indicate an existing release, a past release, or a material threat of a release of hazardous substances or petroleum products into structures on the property or into the ground, groundwater or surface water of the property. The term includes hazardous substances or petroleum products even under conditions in compliance with laws. ! The term is not intended to include de minimis conditions that generally do not present a material risk of harm to public health or the environment and that generally would not be the subject of an 4 i, CONI M