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dtsc.ca.gov <br />SENT VIA ELECTRONIC MAIL <br />November 25, 2025 <br />Natalie Amos <br />Associate Planner <br />City of Pleasanton <br />200 Old Bernal Avenue <br />Pleasanton, CA 94566 <br />namos@cityofpleasantonca.gov <br />RE: DRAFT ENVIRONMENTAL IMPACT REPORT FOR THE HIDDEN CANYON <br />RESIDENCES AND PRESERVE PROJECT DATED NOVEMBER 20, 2025, STATE <br />CLEARINGHOUSE NUMBER 2019080461 <br />Dear Natalie Amos, <br />The Department of Toxic Substances Control (DTSC) reviewed theDraft Environmental <br />Impact Report (DEIR) for the Hidden Canyon Residences and Preserve Project <br />(Project). The proposed Project would build 28 new detached single-family residential <br />units and roadways on approximately 23.89 acres of an approximately 130.98-acre <br />project site within the City of Pleasanton. Project implementation would also include the <br />demolition and reconstruction of two existing single-family homes located in the <br />northeastern portion of the development site, dedication of open space, and annexation <br />of a portion of the project site, including the existing Oak Hills Congregation Church <br />Site, into the City of Pleasanton to ensure a logical reorganization of City of Pleasanton <br />boundaries. DTSC recommends and requests consideration of the following comments: <br />1. When agricultural crops and/or land uses are proposed or rezoned for <br />residential use, several contaminants of concern (COCs) can be present. The <br />Lead Agency shall identify the amounts of Pesticides and Organochlorine <br />Pesticides (OCPs) historically used on the property. If present, OCPs requiring <br />DTSC 2 <br />Page 2 of 5 <br />2