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LENNAIZ SENT VIA CERTIFIED MAIL & E-MAIL July 14, 2023 Jaszit Kang, RENS, Director San Joaquin County Environmental Health Department 1868 E. Hazelton Avenue Stockton, CA 95205the RE: Development Projects Near the Former Coral Hollow Landfill and the Former City of Tracy Landfill Dear Mr. Kang: We are in receipt of your letter dated May 30, 2023. We take the concerns raised in your letter very seriously and Haley & Aldrich, an expert in environmental safety, has been retained to evaluate the testing data and provide a recommendation based upon their review of that scientific data. Following is a history of the land approval and Environmental Impact Report process as well as Haley & Aldrich's conclusions as to the safety of the Hillview and Tracy Hills properties. First, the historyof the land useapproval process. During the land approval and Environmental Impact Report process, which took place from roughly 2015 to 2021, the applicable county and city agencies reviewed the housing plan in order to provide comments. No agency mentioned the potential risk of methane migration or made a recommendation for either methane mitigation or monitoring. As a result, no such measures were required by the City of Tracy as part of the land use approval and Environmental Impact Report process and homes have been permitted, constructed, issued certificates of occupancy, and sold without them. In order to ensure that our customers remain safe and to confirm that there is no evidence of methane migration, Haley & Aldrich was retained to evaluate all of the available data about methane from the landfills based on methane testing originally performed as part of the land development process, as well as the County's own data. According to Haley & Aldrich's report', there is no data or evidence that there is a potential for methane migration and mitigation and monitoring measures are not recommended. Also, the plain language of the regulation EHD cites in its letter does not require mitigation or monitoring measures. Specifically: • In May 2020, Haley & Aldrich was retained to conduct testing at 3070 Corral Hollow Road (aka City of Tracy Landfill). The testing results demonstrate a lack of methane migration and, given the age of the buried waste (disposed at least 76 years ago), continued generation of methane at higher concentrations is not expected. z The results of this testing and the testing discussed below are summarized in the report dated July 13, 2023 (See Attachment A). 2603 Camino Ramon, Suite 525 1 San Ramon, CA 94583 1925.315.0366 1 Lennar.com/BayArea B A Y A R E A LENNAIT