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S E C 0 R <br /> Ms Lori Duncan <br /> ARCO Station 4493 <br /> Site Closure Report <br /> July 31,2006 <br /> Page 5 <br /> CONCLUSIONS AND RECOMMENDATIONS <br /> The following Information fulfills the RWQCB Central Valley Region's requirements for site closure <br /> • All USTs and appurtenances have been removed from the site <br /> • The extent of soil and groundwater contamination has been ascertained from the <br /> Investigations conducted at the site <br /> • The contaminant plume Is not migrating and the concentrations In groundwater will meet <br /> water quality objectives through natural attenuation <br /> • No sensitive receptors are likely to be Impacted <br /> Based on the review of historical soil and groundwater investigation, SECOR requests that ARCO <br /> Station 4493 be considered "low risk"and recommends closure and No Further Action A checklist <br /> of data required by the RWQCB for no further action at UST sites is presented in Attachment E <br /> References <br /> URS, 2003 Monitoring Well Installation Report February 4, 2003 <br /> URS, 2004a Deep Monitoring Well Installation and Fourth Quarter 2003 Groundwater Monitoring <br /> Report March 25, 2004 <br />. URS, 2004b Dual-Completion Monitoring Well Installation Report July 26, 2004 <br /> SECOR, 1999a Soil Sampling during UST, Product Line,and Dispenser Removal Activities,July 7, <br /> 1999 <br /> SECOR, 1999b Monitoring Well Installation Report, July 7, 1999 <br /> s <br /> SECOR, 2000 Additional Site Assessment Report September 5, 2000 <br /> SECOR, 2002 Dual-Completion Well Installation Report August 21, 2002 <br />