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No Further Action Required Request Report <br /> US Can—Welty Road September 24, 2013 <br /> 4. CONCLUSIONS AND RECOMMENDATIONS <br /> Past site investigations performed by SAIC identified the presence and delineated the extent of <br /> TPH in soil and groundwater near the former OVP and TAOC facilities. At least 40 years have <br /> elapsed since the former OVP and TAOC systems were decommissioned, and the plume size has <br /> stabilized and may now be shrinking as natural attenuation continues to remove TPH from soil <br /> and groundwater. <br /> Consistent with SWRCB Resolution No. 92-49, Section III.A through C, SAIC evaluated <br /> alternative cleanup technologies and found that all technologies other than natural attenuation <br /> would be ineffective, infeasible, and costly given the nature of the crude oil in soil and <br /> groundwater. COPCs at the Site will naturally attenuate over time to below WQOs. There are <br /> no current or anticipated future uses of the groundwater due to its likely low yield and poor <br /> quality, and the availability of alternative water supplies. The HHSE demonstrated that COPCs <br /> do not pose a threat to potential residents. It is unlikely that sensitive receptors near the Site <br /> have been significantly affected by on-site soil and groundwater. CEMC requests that the <br /> Central Valley RWQCB issue an NFAR letter for this low-risk site for these reasons. <br /> An SGMP will be prepared by CEMC and provided to the property owners to protect workers in <br /> the event that affected soil and groundwater related to former crude-oil operations are <br /> encountered during future Site construction. The SGMP will also serve to document on-site <br /> conditions. <br /> This report contains the technical data and rationale necessary to support a decision by the <br /> Central Valley RWQCB to issue an NFAR letter for the Site. SAIC prepared this report taking <br /> into consideration the documentation outlined in Appendix A of the Tri-Regional <br /> Recommendations. CEMC requests that the Central Valley RWQCB issue an NFAR letter for <br /> this low-risk site for the reasons provided in this report and summarized in this section. <br /> 5. REFERENCES <br /> California Department of Fish and Game, 2011. California Natural Diversity Database. June. <br /> DWR, 2003. California's Groundwater Bulletin, Update 2003. October(specific basin update <br /> January 2006). <br /> DTSC and CaUEPA, 1999. Preliminary Endangerment Assessment Guidance Manual, <br /> Department of Toxic Substances Control. June. <br /> EPA, 2008. Regional Screening Levels for Contaminants at Superfund Sites. <br /> http://www.epa. og v/region09/sui)erfund/rsl/index.html. September 12. <br /> ERM-West, 1995. Hunter Container Corporation Soil Sampling, 35275 Welty Road, Vernalis, <br /> California. April. <br /> RWQCB (Central Valley Region), 2004. Appendix A—Reports, Tri-Regional Board Staff <br /> Recommendations for Preliminary Investigation and Evaluation of Underground Storage <br /> Tanks. April. <br /> 2008. Water Quality Control Plan (Basin Plan)for the Sacramento River Basin and <br /> the San Joaquin River Basin,4th ed. February. <br /> 11 SAIL <br />