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Shea Homes- Northern California Langston II 4943.009.007 Phase I Environmental Site Assessment 1.0 INTRODUCTION 1.1 PURPOSE OF PHASE I ENVIRONMENTAL SITE ASSESSMENT This assessment was performed at the request of Shea Homes for the purpose of environmental due diligence during property acquisition. The objective of this phase I environmental site assessment is to identify Recognized Environmental Conditions (RECs) associated with the Property. As defined in the ASTM Standard Practice E1527-13, an REC is "the presence or likely presence of any hazardous substances or petroleum products in, on, or at a property: (1) due to release to the environment; (2) under conditions indicative of a release to the environment; or (3) under conditions that pose a material threat of a future release to the environment." We have performed a Phase I Environmental Site Assessment in conformance with the scope and limitations of ASTM Practice E1527 of the approximately 13.3-acre property identified as APN 209-450-39, the Property. Any exceptions to, or deletions from, this practice are described in Sections 1.6 and 5.1 of this report. This assessment has revealed no evidence of Recognized Environmental Conditions in connection with the property. The purpose of conducting this Phase I Environmental Site Assessment is to satisfy the Innocent Landowner Defense in CERCLA liability provided in 42 USC § 9601 (35) and § 9607(b)(3)through detailed assessment of the past use of the property, historical research, site visit, file reviews and/or searches, and interviews with site managers/property owners. 1.2 DETAILED SCOPE OF SERVICES The scope of services performed included the following: • A review of previous environmental reports prepared for the Property. • A review of publicly available and practicably reviewable standard local, state, tribal, and federal environmental record sources. • A review of publicly available and practicably reviewable standard historical sources, aerial photographs, fire insurance maps and physical setting sources. • A reconnaissance of the Property to review site use and current conditions. The reconnaissance was conducted to check for the storage, use, production or disposal of hazardous or potentially hazardous materials. • Interviews with owners/occupants and public sector officials. • Preparation of this report with our findings, opinions, and conclusions. 1.3 SITE LOCATION AND DESCRIPTION ENGEO conducted a phase I environmental site assessment for the Property located at East Ramsey Drive in Mountain House, California (Figures 1 and 2). The approximately 13.3-acre Property is identified as APN 209-450-39 (Figure 3) and currently consists of a sheet-graded lot. ENGEOJuly 2, 2020 Expect Excellence-