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Shea Homes- Northern California Bergamo at Mountain House 4943.009.002 Phase I Environmental Site Assessment Property did not exhibit petroleum hydrocarbons, and arsenic, lead, and mercury were non-detectable or were detected within the acceptable background concentrations. Condor Earth Technologies, Inc.; Neighborhood H Phase I Environmental Site Assessment Report and a Partial Response to Mountain House Master Plan Chapter Six, Mountain House, California; September 17, 2004; Prosect Number 4125H1 Condor Earth Technologies, Inc. (Condor) prepared a phase I ESA in September 2004 for Neighborhood H in Mountain House, which includes the Property (located in the southeast area of Neighborhood H). A review of historic data indicated Neighborhood H had previously been used primarily for agriculture. Condor noted the following potential RECs and/or environmental concerns: • Due to the Property's historic application of agricultural chemicals, Condor determined that pesticides or herbicides may exist in the near-surface soil on the Property. However, a prior phase II ESA (summarized below) did not identify detectable pesticide or herbicide residue in the samples at or above the laboratory detection limits. • Condor determined that hazardous materials (agricultural chemicals) may have accumulated in the soil beneath tailwater ponds and recommended testing the soil upon abandonment when development began. • Petroleum hydrocarbon contamination of soil and groundwater was identified along the northern boundary of the Neighborhood H study area. At the time of Condor's report, investigation and remediation activities were being conducted by Chevron Environmental Management Company in accordance with the requirements of the San Joaquin County Environmental Health Department (SJCEHD) and the Central Valley Regional Water Quality Control Board (CVRWQCB). • Condor opined that an easement containing a natural gas pipeline may have included a petroleum pipeline within the same easement in the past. Other historic petroleum pipelines in the area had been to found to have leaked petroleum hydrocarbons, contaminating surrounding soil. • Condor opined that two active pipelines north of Neighborhood H study area paralleling Byron Road and the railroad tracks. Condor reported that the easements were not leaking but noted other historic petroleum pipelines in the area had been found to have leaked petroleum hydrocarbons, contaminating surrounding soil. Condor Earth Technologies, Inc.; Limited Phase II Environmental Site Assessment Report; Proposed Neighborhood H Site, Assessor Parcels 209-040-03, 209-040-11, and 209-040-15- Mountain House, California; April 20, 2004; Prosect Number 4125H2 In April 2004, Condor conducted a limited phase II ESA for Neighborhood H. The primary objectives of the limited Phase II ESA were to evaluate potential contamination issues and contaminant exposure levels associated with historical agricultural land use practices at the site. Condor personnel collected surface soil samples from 10 locations, which were then analyzed for organochlorine pesticides, organophosphorus pesticides, and chlorinated herbicides. Two of the samples were collected adjacent to the Property. No pesticides or herbicides were detected in the soil samples collected. Based on the laboratory results, Condor concluded that no further action was necessary regarding the application of agricultural chemicals on the parcels. ENGEOApril 20, 2020 Expect Excellence-