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Shea Homes- Northern California Langston II 4943.009.007 Phase I Environmental Site Assessment conducted within the Property zip code, with none of the tests exceeding the current EPA action level of 4 picocuries per liter{pCi/Q1) In accordance with ASTM E2600-15 (Tier 1) (Standard Guide for Vapor Encroachment Screening on Property Involved in Real Estate Transactions), there are no potential petroleum hydrocarbon sources for vapor intrusion within 1/10 mile of the Property or volatile organic compound (VOCs) sources within 1/3 mile of the Property. 4.0 SITE RECONNAISSANCE 4.1 METHODOLOGY ENGEO conducted a reconnaissance of the Property on June 6, 2020. The reconnaissance was performed by Jason Sedore, a Staff Geologist of ENGEO. The Property was viewed for hazardous materials storage, superficial staining or discoloration, debris, stressed vegetation, or other conditions that may be indicative of potential sources of soil or groundwater contamination. The Property was also checked for evidence of fill/ventilation pipes, ground subsidence, or other evidence of existing or preexisting underground storage tanks. Photographs taken during the site reconnaissance are presented in Figure 4. 4.2 EXTERIOR OBSERVATIONS The following table summarizes our observations during the reconnaissance: TABLE 4.2-1: Exterior Site Observations FEATURE TYPE OBSERVATIONS Structures No structures were observed during the site reconnaissance. Hazardous Substances and No hazardous substances or petroleum products were Petroleum Products in Connection with Identified Uses observed within the Property during the site reconnaissance. Storage Tanks (underground and No above-ground storage tanks or evidence of existing above-ground) underground storage tanks was observed during the site reconnaissance. Odors No odors indicative of hazardous materials or petroleum material impacts were noted at the time of the reconnaissance. Pools of Potentially Hazardous Liquid No pools of potentially hazardous liquid were observed within the Property at the time of our reconnaissance. Drums No drums were observed on the Property at the time of the reconnaissance. Polychlorinated Biphenyls (PCBs) No potential PCB-containing equipment, including Containing Equipment transformers, were observed within the Property during our site reconnaissance. Hazardous Substances and No hazardous substance or petroleum product containers were Petroleum Product Containers observed on the Property at the time of our reconnaissance. Pits, Ponds, and Lagoons No pits, ponds or lagoons were observed within the Property at the time of our reconnaissance. California Department of Public Health—Radon Program— (https://www.cdph.ca.gov/Programs/CEH/DRSEM/CDPH%20Document%20Library/EMB/Radon/Radon% 20Test%2OResults.pdf). aAGE0 Page 18 July 2, 2020 Expect Excellence-