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Shea Homes- Northern California Langston II 4943.009.007 Phase I Environmental Site Assessment Based on the distances to the identified database sites, regional topographic gradient, and the EDR findings, it is unlikely that the above-stated database sites pose an environmental risk to the Property. Properties that are on the "Orphan Summary" list appear to be located beyond the ASTM recommended radius search criteria. 3.4 REGULATORY AGENCY FILES AND RECORDS The following agencies were contacted pertaining to possible past development and/or activity at the Property. TABLE 3.4-1: Regulatory Agency Records RECORDSNAME OF AGENCY San Joaquin County Building and San Joaquin County Building and Planning Department did not Planning Department provide requested records at the time of publishing this document. The Mountain House Community Staff indicated there were no pertinent records for the Property. Service District San Joaquin County Environmental San Joaquin County Environmental Health Department Health Department indicated there were no pertinent records for the Property. French Camp Rural Fire Protection The Fire Department indicated there were no pertinent records District for the Property. San Joaquin County Assessor's San Joaquin County Assessor's Office did not reply to our Office record request at the time of publishing this document. Department of Toxic Substances Control — EnviroStor, the DTSC public records website was reviewed. The Mountain House High School facility was identified as a case. The 46.5-acre site was identified as former agricultural farmland located within the Neighborhood D parcel. The site produced alfalfa, corn, sugar beets, and green forage until 2004. The former Shell pipelines (described below) were also identified. When Shell removed the pipeline in 1960, soil and groundwater contamination was identified. DTSC approved a Preliminary Environmental Assessment (PEA) Technical Memorandum Work Plan on July 7, 2008, to investigate the site soils for organochlorine pesticides and arsenic. The findings provided in the PEA report indicated no detection of organochlorine pesticides, and arsenic was below human health risk screening levels of concern. On April 10, 2009, DTSC approved the PEA with a No Further Action report recommendation. State Water Resources Control Board — GeoTracker, the State Water Resources Control Board (SWRCB) public records website was reviewed. 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. No soil was excavated from the Property. 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. 3.5 INDOOR AIR QUALITY An evaluation of indoor air quality, mold, or radon was not included as part of the contracted scope of services. The California Department of Public Health has conducted studies of radon risks throughout the state, sorted by zip code. Results of the studies indicate that two tests were _NGEO July 2, 2020 Expect Excellence-