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FOR IMMEDIATE RELEASE: MEDIA CONTACT:<\/strong> WHEN:<\/strong> WHERE:<\/strong> WHY IT MATTERS:<\/strong> The proposed project includes stormwater infiltration infrastructure near a documented groundwater contamination plume. Annual monitoring reports from monitoring wells surrounding the site indicate groundwater contamination remains present in portions of the plume and is still chemically active near the original site as well as downstream. MAP AND INFOGRAPHICS <\/strong><\/p>\n\n\n\n Aerial map<\/a><\/p>\n\n\n\n
COMMUNITY APPEAL SEEKS FURTHER ENVIRONMENTAL REVIEW OF
HAMILTON LANE SUBDIVISION NEAR HISTORIC CHATHAM CONTAMINATION<\/strong>
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Heidi Whitman, Escondido Resident
781-572-1550 Heidiw07@gmail.com<\/p>\n\n\n\n
Wednesday, August 5
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Escondido City Hall
201 North Broadway
Escondido, CA 92025
WHAT:<\/strong>
The Escondido City Council will hear an appeal of the Planning Commission’s approval of the proposed Hamilton Lane subdivision project. The Planning Commission approved the project on a 4-1 vote. The dissenting commissioner expressed concern about moving soil on a property associated with the Chatham contamination plume without a Soil Management Plan. The appeal asks the City to require additional site-specific environmental review, including
evaluation of potential groundwater and soil vapor concerns associated with the historic Chatham Brothers contamination.
The appeal does not seek to stop development. It requests additional analysis before construction proceeds on a site located within an area that has been monitored by environmental agencies for decades, where remediation goals have still not been met.
Supporters of the appeal include Escondido residents, Escondido Neighbors United, and the North County Group of the Sierra Club.
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The proposed project is located downgradient and above the historic Chatham Brothers contamination plume, a groundwater contamination site & plume that has been monitored by environmental agencies for decades and is not a closed cleanup site. State resource agencies, including the California Department of Toxic Substances Control (DTSC) and the Regional Water Quality Control Board, have been asked to review the project and materials
submitted as part of the appeal. <\/p>\n\n\n\n
Recent monitoring reports continue to detect contaminants including volatile organic compounds (VOCs) and the highly mobile 1,4-dioxane in groundwater near the original contamination source area and in monitoring wells located roughly one mile downgradient. Several monitoring wells continue to report contaminant concentrations well above
California drinking water standards, while some monitoring locations showed increases in contaminant concentrations between the 2024 and 2025 monitoring periods up to 104%. The appeal seeks at minimum a Phase II environmental investigation, along with site-specific hydrogeologic, groundwater, soil, and soil vapor analysis before construction proceeds. Supporters argue that these studies are necessary to determine whether the proposed development and stormwater management infrastructure could interact with known contamination in the area and to ensure potential environmental and public health impacts have been fully evaluated.
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The appeal also raises concerns regarding reliance on environmental review documents that originated in 2007 and removal and relocation impacts of the site’s natural embedded granite boulder formations.
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![Aerial map<\/a><\/p>\n\n\n\nHistory of Chatham Barrel Yard<\/a><\/p>\n\n\n\nWhy Soil Vapor is a Concern<\/a><\/p>\n\n\n\nWHO:<\/strong><\/p>\n\n\n\n\nEscondido City Council<\/li>\n\n\n\nResidents and neighboring property owners<\/li>\n\n\n\nEnvironmental advocates<\/li>\n\n\n\nRepresentatives of community organizations supporting the appeal<\/li>\n<\/ul>\n\n\n\nPrevious postings<\/p>\n\n\n\n\nHousing Site near Chatham Needs Envl Review and Mitigation- June 10, 2026 5 PM City Hall<\/a><\/blockquote>](\"https:\/\/escondidoneighbors.org\/wp-content\/uploads\/2026\/06\/Aerial_map_Hamilton_appeal-1.jpg\"){kind=link}
![History of Chatham Barrel Yard<\/a><\/p>\n\n\n\nWhy Soil Vapor is a Concern<\/a><\/p>\n\n\n\nWHO:<\/strong><\/p>\n\n\n\n\nEscondido City Council<\/li>\n\n\n\nResidents and neighboring property owners<\/li>\n\n\n\nEnvironmental advocates<\/li>\n\n\n\nRepresentatives of community organizations supporting the appeal<\/li>\n<\/ul>\n\n\n\nPrevious postings<\/p>\n\n\n\n\nHousing Site near Chatham Needs Envl Review and Mitigation- June 10, 2026 5 PM City Hall<\/a><\/blockquote>](\"https:\/\/escondidoneighbors.org\/wp-content\/uploads\/2026\/05\/ChathamPlumeHistoryInfographic.png\"){kind=link}
![Why Soil Vapor is a Concern<\/a><\/p>\n\n\n\nWHO:<\/strong><\/p>\n\n\n\n\nEscondido City Council<\/li>\n\n\n\nResidents and neighboring property owners<\/li>\n\n\n\nEnvironmental advocates<\/li>\n\n\n\nRepresentatives of community organizations supporting the appeal<\/li>\n<\/ul>\n\n\n\nPrevious postings<\/p>\n\n\n\n\nHousing Site near Chatham Needs Envl Review and Mitigation- June 10, 2026 5 PM City Hall<\/a><\/blockquote>](\"https:\/\/escondidoneighbors.org\/wp-content\/uploads\/2026\/05\/ChathamPlumeVaporInfographic.png\"){kind=link}