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Shea Homes- Northern California Langston II 4943.009.007 Phase I Environmental Site Assessment 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. 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. 6.1 SIGNIFICANT ASSUMPTIONS OR DEVIATIONS FROM ASTM STANDARD PRACTICE There were no significant assumptions or deviations from the ASTM Standard Practice. 6.2 OPINIONS AND DATA GAPS 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 following data gaps were identified. • San Joaquin County Assessor's Office and San Joaquin County Building and Planning Department responses were not provided prior to publication of this report. • A preliminary title report was not provided prior to publication of this report. The data gaps identified during this process do not affect the conclusions as to the presence or lack of presence of RECs at the Property. 6.3 LIMITATIONS AND EXCEPTIONS OF ASSESSMENT The professional staff at ENGEO strives to perform its services in a proper and professional manner with reasonable care and competence but is not infallible. The recommendations and conclusions presented in this report were based on the findings of our study, which were developed solely from the contracted services. The findings of the report are based in part on contracted database research, out-of-house reports, and personal communications. The opinions sAGE0 Page 110 July 2, 2020 Expect Excellence-