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Cleanup in Vulnerable Communities'Initiative Discovery Project Reference:Favorite Cleaners and Enforcement Discovery Investigation Work Plan Project Number:60688620 8. Discovery Investigation Report Preparation The Report presenting the results of the overall investigation will be prepared.The Report will include the Subject Property background and environmental setting information,field procedures, presentation of field observations and analytical results including boring logs and laboratory report sheets, data review results,findings, conclusions and recommendations, summary tables and sampling maps, human health vapor intrusion screening evaluation, and summary of the public participation activities. The conclusions of the Report will answer three main questions: • Have current or past practices resulted in a release or threat of a release due to dry-cleaning operations at the Subject Property? • If a release due to dry-cleaning operations has occurred,does it pose a significant threat to public health or the environment, and if not, why not? • What further specific information and/or removal/remediation actions are necessary in order to better assess or abate threats posed by the Subject Property to human health and the environment? AECOM will prepare a draft Report to document all sampling activities and present chemical data. In the Report, sampling locations will be labeled on maps with legends and markers that describe the types of media sampled/and type of sampling performed and represent the concentrations of the COC depicted in the map(e.g., size of marker representing relative concentration), markers labeled with the concentration of the COC for screening level comparison purposes(both 0.03 and 0.001 attenuation factor values), and concentration contour lines and suspected source labeled. The initial attenuation factor for soil vapor is 0.03, and 0.001 is the attenuation factor for groundwater to indoor/outdoor ambient air. Sampling results/data will be analyzed using both 0.03 and 0.001 attenuation factors, and the results will be summarized in tables that contain current and relevant human health residential and Industrial/commercial screening levels, as described in DTSC's HHRA Notes 3 and 4(DTSC 2022b and 2022a), USEPA regional screening levels(RSLs)(USEPA 2023), and San Fransisco Bay Regional Water Quality Control Board (SFBRWQCB)environmental screening levels(ESLs)(SFBRWQCB 2019)for comparison; similar measurement/metric units will be used to facilitate comparison. Findings, conclusions, and recommendations will be made regarding the need for further actions to further assess and/or remediate conditions at the Subject Property, based on site investigative findings and the risk screening evaluations in order to make planning decisions, or move forward with redevelopment. If further action is recommended,the Report will identify remaining data gaps and/or remediation needs and strategies.The Report will also include recommendations for expedited response actions necessary to mitigate any immediate potential hazards to public health or the environment, if needed. No-further-action recommendations will be made if the screening level assessment indicates that cumulative risks/hazards of detected contamination are determined to be below risk-based screening levels. Prepared for: California Department of Toxic Substances Control AECOM 34