Laserfiche WebLink
4 Analytical Data <br /> Surface and subsurface soil samples were analyzed for the following contaminants of potential <br /> concern(COPCs), as indicated in the FSP: <br /> • TPH-g by EPA Method 8015C, and TPH-mo and TPH-d by EPA Method 801513; <br /> • VOCs by EPA Method 8260 or SOM01.2, or equivalent; and <br /> • Resource Conservation and Recovery Act (RCRA) metals by EPA Method 6010/7473 or <br /> ILM05.4, or equivalent. <br /> Groundwater samples were analyzed for the following: <br /> • TPH-g by EPA Method 8015C, and TPH-mo and TPH-d by EPA Method 8015B; and <br /> • VOCs by EPA Method 8260, SOMOLI, SOM01.2 or equivalent. <br /> 4.1 Site-Specific Action Levels <br /> The site-specific action levels for COPCs are presented with the laboratory analytical results for <br /> soil samples in Tables 1, 2, and 3 for TPH, RCRA metals, and VOCs, respectively, and for <br /> groundwater in Tables 4 and 5 for TPH and VOCs respectively(Appendix C). As proposed in the <br /> FSP (E & E 2010a), the site-specific action levels for each of the COPCs in soil are based on the <br /> lowest available industrial screening level for each constituent. The 2008 California Regional <br /> Water Quality Control Board(RWQCB) Environmental Screening Levels (ESLs)were the <br /> primary levels used to establish soil action levels for COPCs. The 2008 RWQCB ESLs, 2010 <br /> U.S. EPA Region 9 Regional Screening Levels (RSLs), and 2005 California EPA California <br /> Human Health Screening Levels (CHHSLs) were used to establish COPC action levels for soils <br /> at the site. <br /> The selected site-specific action levels for the COPCs in groundwater are either the 2008 <br /> RWQCB ESLs or the U.S. EPA Maximum Contaminant Levels (MCLs). The lowest listed <br /> concentration among the regulatory values (ESL or MCL)was selected as the site-specific action <br /> level selected for each analyte. In some cases, the lowest regulatory value was less than the <br /> reporting concentration achievable through U.S. EPA laboratory resources. In these cases, the <br /> laboratory reporting limit was used as the site-specific action level rather than the lowest <br /> published screening level. <br /> 4.2 Summary and Discussion of Soil Results <br /> Laboratory analytical results for the COPCs in soil are presented in Tables 1, 2, and 3 for TPH, <br /> RCRA metals, and VOCs, respectively(Appendix C). <br /> 4-1 <br />