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December 14, 2020 Project No. 20-6235 Page 17 AdvancedGeo An Employee-Owned Company /Oa ,64.6••• 4 7.4. RADON Radon is a naturally occurring, colorless, odorless gas that is soluble in water. It is produced through the radioactive decay of uranium and radium, which is naturally present in soil and in minerals in bedrock. Radon is radioactive, which means that it breaks down or decays to form other elements. Radon concentrations generally differ among different rock types and can vary considerably within the same geologic formation. Radon moves from its source in rocks and soils through voids and fractures. It can enter buildings as a gas through foundation cracks or it can dissolve in ground water and be carried to buildings through the use of water-supply wells. Buildings with basements and concrete slab foundations are more susceptible to elevated levels of indoor radon gas. The inhalation of radon gas can cause damage to lung tissue. A common unit of radioactivity measurement is picocuries per liter (pCi/L). The USEPA established the recommended safe radon level at 4 pCi/L. According to the USEPA, the subject property county, San Joaquin , is located in a low radon potential area (Zone 3), defined as having a 'predicted average indoor radon screening level of less than 2 pCi/L'. 7.5. WETLANDS As reported in Section 3.2., according to the EDR Report (Appendix C) the subject property is not located within a National Wetlands Inventory. This data, available in select counties across the country, was obtained by EDR from the U.S. Fish and Wildlife Service. 7.6. REGULATORY COMPLIANCE AGI searched the subject property address, 3009 Pock Lane, Stockton, California, on local, state and federal databases. No records were found regarding any outstanding regulatory permitting or requirements/directives in connection with the property. 8.0. EVALUATION Any deviations from the ASTM Standard Practice 1527E-13 and USEPA AAI are presented below, along with the findings, conclusions, and opinions identified during the course of this Phase I. 8.1. DATA GAPS AND LIMITATIONS A data gap occurs when a lack of or inability to obtain information required by this practice desoite good faith efforts by the environmental professional to gather such information. Data gaps may result from incompleteness in any of the activities required by this practice, including, but not limited to site reconnaissance, and interviews. The following data gaps and/or limitations were identified during the course of this Phase I, which may deviate from the ASTM standard practice: The largest data gap in research was 24 years, between 1913 and 1937, with the earliest researched information being a Topographic Map dated in 1913. Data gaps generally do not exceed five years between 1940 through the present, except between 1940 and 1952, between 1957 and 1963, between 1968 and 1975, between 1976 and 1982, between 1987 and 1993, and between 1998 and 2006. AGI does not believe any gaps in the data reviewed have affected the ability to identify recognized environmental concerns.