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Nancy Arroyo March 19, 2024 Page 2 The project site currently has eight existing non-conforming single-family dwellings and proposes the demolition of four existing single-family residences and an accessory storage structure. Additionally, the project proposes to construct two single family residences, two accessory dwelling units and two duplexes. DTSC has identified that this project may affect an active or nonactive mitigation and clean-up site, which is located near or within the project boundaries. The site, California Fuels is currently vacant and fenced and a warehouse is the only remaining site feature. Fuel tanks were removed in June of 1988. Groundwater is very shallow, about 10- 20 feet and Total Petroleum Hydrocarbons (TPH) was detected at 22 ppm at 7 feet. San Joaquin County referred the site to the Regional Water Quality Control Board (RWQCB). Based on our project review, we request consideration of the following comments: 1. The City of Gonzales enter into DTSC's Standard Voluntary Agreement (SVA) program or work with RWQCB and/or the San Joaquin County Environmental Health Department, so a proper evaluation of the Project is completed. If entering into an SVA with DTSC, the FLUXX portal link is provided and the page also has a link to the Fluxx User Guide that can help you navigate the system. You will need to create a new profile and once in the system, click "Start a Request for Lead Agency Oversight Application. If you have any questions about the application portal, please contact the DTSC Brownfield Coordinator Gregory Shaffer or contact the Application Portal Inbox. 2. DTSC recommends that all imported soil and fill material should be tested to ensure any contaminants of concern are within approved screening levels for the intended land use. To minimize the possibility of introducing contaminated soil and fill material there should be documentation of the origins of the soil or fill material and, if applicable, sampling be conducted to ensure that the imported soil and fill material meets screening levels for the intended land use. The soil sampling should include analysis based on the source of the fill and knowledge of the prior land use.