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Lennar Homes of California Mountain House Creek, Parcel L, Tract 3424, Tracy 4943.410.103 Modified Phase I Environmental Site Assessment EXECUTIVE SUMMARY ENGEO conducted a modified phase I environmental site assessment for the property located at 350 N. Estes Way in Tracy, California (Property). The Property is approximately 21.1 acres in area and is identified by Assessor's Parcel Number (APN) 256-040-01. The Property consists of an undeveloped area with two large drainage canals used to divert rain water toward Mountain House Creek area to the south of the Property. Review of historical records indicates that the Property has remained undeveloped land since at least 1937 and remains so today. Two large drainage canals were constructed on the Property in 2004 to 2005. 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. An agrichemical assessment did not identify any concentrations of organochlorine pesticides (OCPs), arsenic, or lead in surface soil that exceed relevant screening levels and/or typical naturally occurring background concentrations. 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. The data gaps identified during this process, if any, do not affect the conclusions as to the presence or lack of presence of RECs at the Property. This assessment has revealed no evidence of Recognized Environmental Conditions in connection with the Property, and we believe the Property is suitable for the proposed residential development. ENGEO recommends no further environmental studies at this time. ENGEO March 15, 2021 Expect Excellence