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Lafferty Communities Oakwood Shores – Area 1 12921.000.003 Modified Phase I Environmental Site Assessment Page | 1 May 28, 2021 EXECUTIVE SUMMARY ENGEO conducted a modified phase I environmental site assessment for the Oakwood Shores – Area 1 property, located at 4147 Volpaia Place in Manteca, California (Property). The Property is approximately 6.25 acres in area and is identified by Assessor’s Parcel Number (APN) 241-52- 016. The Property is currently vacant. Review of historical records indicates that the Property was utilized for agricultural purposes from at least 1937 to at least 1968. By 1982, the western portion of the Property was developed into recreational vehicle parking. By 2006, the Property was cleared of all vegetation during mass grading operations for the master-planned Oakwood Shores development. The mass grading operations also involved placing approximately 2 feet of unengineered fill across the Property. This assessment included a review of local, state, tribal, and federal environmental record sources, standard historical sources, aerial photographs, fire insurance maps and physical setting sources. A reconnaissance of the Property was conducted to review site use and current conditions to check for the storage, use, production or disposal of hazardous or potentially hazardous materials and interviews with persons knowledgeable about current and past site use. The site reconnaissance and records review did not find documentation or physical evidence of soil or groundwater impairments associated with the use or past use of the Property. A review of regulatory databases maintained by county, state, tribal, and federal agencies found no documentation of hazardous materials violations or discharge on the Property and did not identify contaminated facilities within the appropriate American Society for Testing and Materials (ASTM) search distances that would reasonably be expected to impact the Property. Based on the findings of this assessment, no Recognized Environmental Conditions (RECs), no historical RECs, and no controlled RECs were identified for the Property. ENGEO has performed a modified phase I environmental site assessment in general conformance with the scope and limitations of ASTM E1527-13 and the standards and practices of the All Appropriate Inquiry – Final Rule (40 Code of Federal Regulations Part 312). It is our opinion that the findings of this study are based on a sufficient level of information obtained during our contracted scope of services to render a conclusion as to whether additional appropriate investigation is required to identify the presence or likely presence of a REC. No data gaps were identified during preparation of this report. This assessment has revealed no evidence of RECs in connection with the Property, and the Property is suitable for residential development. ENGEO recommends no further environmental studies at this time. We understand that future grading activities are planned at the Property, which may include soil import or export activities. Based on the potential soil import or export during grading, it may be beneficial to develop a Soil Management Plan (SMP) prior to the start of construction. The SMP would describe the procedures and protocols that may be needed if unforeseen environmental impacts are encountered at the Property during grading activities. The SMP would also provide guidance on any supplemental soil sampling and analysis that may be needed to approve import sources or export on-site soil. Please let us know if you would like us to prepare a proposal for SMP preparation services.