CORRESPONDENCE_2018-2025 - Laserfiche WebLink

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• In August and September 2021, Haley & Aldrich conducted testing at 30600 Corral Hollow Road (Hillview Community) directly adjacent to the City of Tracy Landfill. Methane was not detected. This is further evidence that methane migration is not occurring from buried waste in the City of Tracy Landfill. In January 2022, Haley & Aldrich conducted testing along the northeast border of the Tracy Hills project phases 2, 3, and 4. No methane concentrations were detected in any of the 12 vapor probes. • The County's Corral Hollow Landfill contains an active landfill gas collection system, with the methane generated within this landfill being captured and controlled by this system. Quarterly monitoring performed demonstrates the continued effectiveness of this system. In March 2023 (the latest quarterly check), no methane concentrations were detected in any of the landfill's nine gas monitoring wells. Three of these wells are located along the northwest perimeter between the Corral Hollow landfill and the adjacent Tracey Hills phase 2 property. • Following its review of EDH's letter as well as its reevaluation of testing results from 2020 and 2022, Haley & Aldrich stated that there is no evidence that methane is presently migrating or is likely to migrate in the future from the City of Tracy Landfill or the Corral Hollow Landfill. As such, Haley & Aldrich concludes that "methane mitigation and monitoring measures are not recommended". EHD has not provided any data or other evidence to support its concern that there is a potential for methane migration. The sole basis of the recommendation appears to be a regulation which EHD acknowledges does not apply to the development (Title 27 CCR, Section 21190). That regulation requires such methane mitigation measures only for on-site structures within a landfill's site boundaries. None of the homes are being built within a landfill's site boundaries. Ensuring that our communities are safe and comply with applicable laws and regulations, is the top priority for Lennar. We have therefore carefully considered the Environmental Health Department's (EHD) recommendations about methane mitigation and monitoring. Based on Haley & Aldrich's report, the lack of any data or evidence to support EHD's concern that there is a potential for methane migration, and the plain language of the regulation EHD cites in its letter, we do not think such mitigation or monitoring measures are required or necessary. However, we plan to disclose EHD's concerns to future Lennar customers and Lennar customers currently under contract at Hillview. A copy of the disclosure language to be used at the Hillview community is set forth on Attachment B. Those currently under contract will be provided the option to cancel and receive a deposit refund. Sincerely, r6 Bridgit Koller 2603 Camino Ramon, Suite 525 1 San Ramon, CA 94583 1925-315-0366 j Lennar.com/BayArea B A Y A R E A LENNAIT