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Lennar Homes of California Mountain House Creek, Parcel L, Tract 3424, Tracy 4943.410.103 Phase I Environmental Site Assessment 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 NAME OF • . At the time of report preparation, we have not received a response from the Tracy Clerk's office. However, in our 2021 City of Tracy Clerk's Office Phase I ESA report for the Property, the Tracy City Clerk informed us that the Property was under the jurisdiction of San Joaquin County. We submitted a file review request to the San Joaquin County Department of Environmental Health and did not receive a San Joaquin County Department of response by the time of report preparation. However, in our Environmental Health 2021 Phase I ESA report for the Property, the San Joaquin County Department of Environmental Health informed us that they found no records for the Property. We submitted a file review request to the South San Joaquin San Joaquin County Fire Department County Fire Authority. No response had been received by the time of the preparation of this report. San Joaquin County Assessor's We reviewed the San Joaquin County Assessor's Office online Office database and confirmed the APN and associated acreage associated with the Property. We reviewed the GeoTracker database maintained by the State Water Resource Control Board (SWRCB) to identify ongoing California State Water Resources environmental site assessment and remedial activities at and Control Board near the Property. There were no listings for the Property in the GeoTracker database. A summary of relevant files for nearby properties is presented in Section 3.3.1.2. We reviewed the EnviroStor database maintained by the Department of Toxic Substances Control (DTSC) to identify Department of Toxic Substances ongoing environmental site assessment and remedial activities Control associated with the Property. There were no listings for the Property or nearby facilities in the EnviroStor database. A summary of relevant files for nearby properties is presented in Section 3.3.1.2. 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 conducted within the Property zip code, with no tests exceeding the current EPA action level of 4 picocuries per liter (pCi/L)'. 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 1 California Department of Public Health—Radon Program— (https://www.cdph.ca.gov/Programs/CEH/DRSEM/CDPH%20Document%20Library/EMB/Radon/Radon% 20Test%2OResults.pdf). ENGEO Page 17 January 28, 2022 Expect Excellence