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Vapor Intrusion Assessment Work Plan Project number:60653972 • Interferences • Blank contamination 5.6.7 Data Reporting Laboratory measurements will be recorded in standard formats that specify site location, sample identification,date,matrix parameter,parameter value,reporting limit, and detection limit. Data shall be reported and flagged. Laboratory and field data will be combined and summarized in final tables and graphs that are appropriate to the type of data and convey information to support the findings of the data collection program.Data will be clearly tabulated and presented in a consistent way to facilitate the comparison of common sets of data. Soil data will be reported in dry weight. 5.6.8 Data Management All data will be reported by the laboratory in both electronic and hardcopy formats. The data will be uploaded into the project database. The database will be populated with any qualifier flags added by the project chemist after validation.This electronic format will be available to project personnel in the various formats. In addition,the field and analytical data will be uploaded into the State GeoTracker database. 6. Reporting Upon completion of the Vapor Intrusion Assessment,AECOM will submit a Soil Gas Investigation Report to CVRWQCB containing the documentation produced during the investigation, and subsequent analysis of the samples collected. The Report shall include a summary of the fieldwork and analytical results, any necessary update to the site conceptual model, as well as an evaluation of potential remedial actions,though the scope of this investigation will be primarily focused on characterizing site conditions and risk to human health and the environment. Risk to human health will be evaluated using the most recent risk assessment guidance presented in DTSC Human and Ecological Risk Office(HERO)Human Health Risk Assessment(HBRA)Note 1 (DTSC, 2019b),DTSC HERO HHRA Note 3 (DTSC,2022b),DTSC HERO HHRA Note 4 (DTSC, 2022a),DTSC HERO HHRA Note 5 (DTSC,2014),and DTSC HERO HHRA Note 10(DTSC,2019a). Based on the site location and use of the site,the risk assessment will be conducted for a commercial/industrial scenario. Cumulative risks and hazard indices will be presented in accordance with DTSC HERO HHIZA Note 4 (DTSC,2022a). An uncertainty evaluation that presents the uncertainties associated with the risk calculations and limitations of the assessment will be included in the risk assessment report. Making recommendations for any treatability testing or further investigation would be presented in a subsequent workplan, if determined to be necessary. A draft, draft final and final version will be produced assuming up to two rounds of consolidated comments from CVRWQCB. The drafts will in electronic format and the final will include the electronic deliverable and two hard copies submitted via U.S.Mail. 7. Limitations This Work Plan was prepared in accordance with the scope of services set forth in the written agreement signed by British Petroleum and AECOM.No other services beyond those explicitly stated should be inferred or are implied.This report was prepared by AECOM for Client in a manner consistent with the level of care and skill ordinarily exercised by professional engineers, geologists, and environmental scientists in the geographic area of the site at the time AECOM's services were provided.AECOM Prepared for: California Regional Water Quality Control Board,Central Valley Region AECOM