ARCHIVED REPORTS_SECOND SEMIANNUAL 2018 GROUNDWATER MONITORING REPORT

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Second Semiannual and 2018 Annual Groundwater Monitoring Report JACOBS® 1 . Introduction This report was prepared by CH2M HILL (CH2M), now a wholly owned subsidiary of Jacobs Engineering Group Inc. (Jacobs), on behalf of SFPP, L.P. (SFPP), an operating partnership of Kinder Morgan, Inc. This report presents the results of groundwater monitoring activities at the SFPP Holt Release Site, located in Holt, California (the site). Groundwater monitoring and reporting activities are performed under Monitoring and Reporting Program (MRP) No. R5-2018-0806 issued by the Central Valley Regional Water Quality Control Board (RWQCB) on March 21, 2018. This report fulfills the reporting requirements for the second semiannual and annual 2018 monitoring periods in accordance with the MRP. The location • and layout of the site are shown on Figures 1 and 2, respectively. 1.1 Objectives This report is organized as follows: • 0 Section 1 presents the report introduction and background. • Section 2 presents the monitoring results for the second semiannual period for 2018. • Section 3 presents the annual report for 2018. • • Section 4 presents a list of referenced documents used to prepare this report. . Appendix A presents the field data collected by Blaine Tech Services for the second semiannual 2018 monitoring period. • Appendix B presents the laboratory reports by Alpha Analytical, Inc., for the second . semiannual 2018 monitoring period. • Appendix C presents historical groundwater elevation and concentration data. • Appendix D presents time series charts for groundwater elevation and concentration data. • Appendix E presents long-term concentration trend charts, which are the charts in Appendix D, • but with expanded scales. • Appendix F presents the tables and figures from the first semiannual 2018 groundwater monitoring report(CH2M, 2018). 1.2 Background SFPP owns and operates an underground petroleum pipeline connecting Stockton, California (Stockton Junction) to the San Francisco Bay Area (Concord Station). In February 1986, a pipeline release occurred approximately 7 miles west of Stockton near Holt, California (Figures 1 and 2). Spill and emergency response activities were performed to clean up and contain fuel from the spill. A bypass pipeline was constructed around the leaking section, and the pipeline was placed back in service by March 1986 (Figure 2). The release area is bounded to the north and west by Trapper Slough, and to the i east by Whiskey Slough Road and an agricultural field. The site is collocated with the Arcady Oil Company Mud Disposal Site, which was operated as a Class III disposal site for oil-drilling muds between April 1960 and May 1984 under Waste Discharge Requirements issued by the RWQCB. Hydrocarbon residuals from the February 1986 pipeline release are present in subsurface soils and groundwater at the site. A comprehensive discussion of historical site investigations and interim remediation activities to address hydrocarbons at the site is provided in the Final Site Characterization Report(CH2M, 2002). A summary of these historical activities is provided below, followed by a summary of current remediation activities and recent history of the site. 0 0 0 AX 1015181035SCO 0