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PHASE I ENVIRONMENTAL SITE ASSESSMENT 1.0 SUMMARY Aperio Inc. has been retained by Mr. Art Hand, Jr. Assistant Superintendent of the Lodi Unified School District(LUSD) to conduct a Phase I Environmental Site Assessment (Phase 1)for the site located at 9925 Lower Sacramento Road, Stockton, San Joaquin County, California, 95210 (see Vicinity Map, Figure 1, Appendix A). The Assessor's Parcel Number(APN) for the parcel is 070-140-32(Site). LUSD has proposed to build a new elementary school at the Site, tentatively named Podesta Ranch Elementary School. The school is expected to serve 826 students in a K-6 elementary school consisting of 34 new classrooms. The 11.70 acre parcel is currently a mechanically disced field. The southeast corner of the property contains a house, domestic water well, and garage. Historically, the remainder of the property has been used as agricultural land with evidence of an orchard existing at one time on the parcel. Sixteen (17)Federal,twenty six (26) State, and three (3) regional and local databases were searched to determine whether any recognized environmental conditions exist on the subject property. The search radius for this investigation extended to adjoining properties and properties within a search distance of one-eighth to one mile. The background and past uses of the subject property were investigated. Physical characteristics including the topography, hydrogeologic setting, and groundwater depth and flow direction beneath the subject property were researched. A site reconnaissance of the subject property and its immediate surroundings was completed as well. The data pertinent to this investigation can be found in the body of this document. The primary investigator for the assessment was David Wood, California Professional Geologist# 6532 and Hydrogeologist#802. 2.0 INTRODUCTION 2.1 Purpose The purpose of the Phase I is to partially fulfill the All Appropriate Inquiry (AAI) rule and to satisfy the three Comprehensive Environmental Response, Compensation and Liability Act(CERCLA) defenses: innocent landowner, bona fide prospective purchaser, and contiguous property owner. The new AAI rules will initiate an update of the latest revision of the American Society for Testing and Materials (ASTM) E1527-05. ASTM is in the continuing process of revising E1527 to bring the process in line with the developing federal rule. The purpose of this report is to "identify conditions indicative of releases or threatened releases...of hazardous substances, as defined in CERCLA 101(14)" as described under Phase I Environmental Site Assessment Proposed Podesta Ranch Elementary School December 5,2006 Page 4 of 4