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Shea Homes- Northern California Langston II 4943.009.007 Phase I Environmental Site Assessment EXECUTIVE SUMMARY ENGEO conducted a phase I environmental site assessment for the property located at East Ramsey Drive in Mountain House, California (Property).The Property is approximately 13.3 acres in area and is identified by Assessor's Parcel Number (APN) 209-450-39. The Property consists of a sheet-graded parcel. Review of historical records indicates that the Property was used for agricultural purposes dating back to at least 1937 until 2012, after which the parcel was sheet graded and surrounding roadways completed. The Property has remained undeveloped since it was graded sometime after 2012. 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 identified documentation but no physical evidence of soil or groundwater impairments associated with the use or past use of the Property; a past release from petroleum pipelines (as explained below) impacted soil and groundwater. 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 RECs or controlled RECs were identified for the Property. The following historical REC was identified. In 2006 and 2007, about 165,000 cubic yards of soil contaminated with petroleum hydrocarbons from two former pipelines, which were removed from operation in the 1960s, were excavated from 25 areas of concern in Neighborhoods B, C, and D. Residual hydrocarbons remained in soil after the remediation; however, the RWQCB concluded the remaining petroleum impact does not pose a threat to human health, the environment, or the waters of the State. No Further Action status was granted in November 2011. ENGEO has performed a 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 RECs in connection with the Property, and the Property is suitable for residential development. ENGEO recommends no further environmental studies at this time. ENGEOJuly 2, 2020 Expect Excellence-