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Wanda Farmer January 17, 2023 Page 2 The RECs identified in the Report include the former dry-cleaning operations conducted at the Site, coupled with the documented use, and reported spill of tetrachlorethylene (PCE). Additionally, the Report identified the former Manteca Equipment Rental, Manteca Ford, Delta National Bank, and Manteca Tire as RECs. Manteca Equipment Rental, previously located at or near the Site, had a leaking underground storage tank case that was closed in 1999; however, it was noted residual volatile organic compounds (VOCs) may be present in the soil and may volatize during excavation. Manteca Ford and Delta National Bank, located 257 feet and 66 feet upgradient from the Site, respectively, have unknown information regarding its historical and regulatory status regarding the case closures of waste oil and petroleum underground storage tanks. Manteca Tire, located 235 feet west of the Site, is a chemical storage facility with violations issued for improper storage of hazardous materials, as well as for administrative purposes. Manteca Tire has unknown information regarding its historical status for the storage of chemicals. The Site is listed as a Resource Conservation and Recovery Act small-quantity hazardous waste generator. A Hazardous Waste USEPA Identification Number was issued to the Site between 1987 and 2005. According to the Report, there are a total of 127 waste manifests available, with records confirming the disposal of PCE between 1993 and 2007. In 2001, the San Joaquin County Emergency Services were notified that 30 gallons of PCE was spilled when the electricity shut off and the boiler overflowed. The Site was evacuated at the time, however, there is no additional information available regarding the cleanup of the spill. Based on DTSC's review of the information provided in the Report, DTSC concurs with the recommendations that potential risk, associated with vapor forming chemicals as a result of dry-cleaning operations, exists at the Site. Therefore, Discovery Investigation for additional assessment for RECs identified in the Report is warranted. Additional assessment for other RECs identified in the Report from the potential presence of associated petroleum hydrocarbon products and/or other unknown chemicals being stored at and around the site at is also warranted. However, such assessment should be conducted separate from the D&E Program's Discovery Investigation that will only evaluate releases to the environment associated with chlorinated VOCs. DTSC recommends a Discovery Investigation be conducted for the Site in accordance with Contract 22-T5019, Tasks 4 through 10, and the Health and Safety Code section 25355.5(c). The purpose of the Discovery Investigation is to evaluate whether a release to the environment has occurred and determine the potential risk to human health and the environment.