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0 <br /> • Second Semiannual and 2018 Annual Groundwater Monitoring Report JACOBS® <br /> • <br /> • <br /> Contents <br /> Acronyms and Abbreviations " <br /> ...................................................................................................................iii <br /> 1. Introduction.................................................................................................................................1-1 <br /> . 1.1 Objectives ........................................................................................................................ 1-1 <br /> 1.2 Background......................................................................................................................1-1 <br /> • 1.2.1 Site Investigation Activities .................................................................................1-2 <br /> 1.2.2 Interim Site Remediation Activities.....................................................................1-2 <br /> 1.2.3 Current Site Remediation Activities....................................................................1-2 <br /> • 1.2.4 Monitoring and Reporting Program.....................................................................1-3 <br /> 2. Results for Second Semiannual Period 2018...........................................................................2-1 <br /> 2.1 Groundwater Monitoring ..................................................................................................2-1 <br /> 2.1.1 Methods ..............................................................................................................2-1 <br /> 2.1.2 Results................................................................................................................2-2 <br /> • 2.2 Status of Remediation and Other Completed Activities...................................................2-4 <br /> 2.2.1 Remediation Activities.........................................................................................2-4 <br /> 2.3 Planned Upcoming Semiannual Activities.......................................................................2-4 <br /> 3. Annual Report for 2018...............................................................................................................3-1 <br /> 3.1 Groundwater Monitoring Results .....................................................................................3-1 <br /> • 3.1.1 Groundwater Elevations and Flow......................................................................3-1 <br /> • 3.1.2 Nonaqueous-Phase Hydrocarbons.....................................................................3-2 <br /> 3.1.3 Total Petroleum Hydrocarbons and Benzene, Toluene, Ethylbenzene, and <br /> • Total Xylenes......................................................................................................3-2 <br /> 3.2 Effectiveness of the Current Remediation System..........................................................3-2 <br /> 3.3 Identification of Data Gaps and Potential Deficiencies/ Redundancies...........................3-3 <br /> 4. References...................................................................................................................................4-1 <br /> • Appendixes <br /> 0 A Field Data Sheets (Blaine Tech Services) <br /> 46 B Laboratory Reports (Alpha Analytical, Inc.) <br /> C Historical Groundwater Elevation and Concentration Data <br /> D Time Series Charts <br /> . E Long-Term Trend Charts <br /> F Tables and Figures from First Semiannual 2018 Groundwater Monitoring Report <br /> Tables <br /> • 1 Well Construction Summary <br /> 2 Groundwater Depths and Elevations, September 7, 2018 <br /> 3 Hydrocarbon Concentrations and Field Parameter Results, September 7, 2018 <br /> • Figures <br /> • 1 Site Location <br /> 2 Site Layout <br /> . 3 Groundwater Elevation Contour Map, September 7, 2018 <br /> 4 Dissolved-Phase TPH-g Concentration Map, September 7, 2018 <br /> • 5 Dissolved-Phase Benzene Concentration Map, September 7, 2018 <br /> • AX1015181035SCO <br />