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I I <br /> Shell-branded Service Station <br /> 341 East Main Street,Ripon, CA <br /> Page 2 <br /> 02/24-26/99 Five CPT borings (CPT 11 — 15) were advanced off-site during this time. <br /> Only methanol was detected at 3.2 mg/kg and 1.6 mg/kg in soil samples <br /> collected from C8-S-40-and C9-S-41, respectively. MTBE was detected at <br /> 3,010 gg/L and 141 gg/L in grab groundwater samples collected from <br /> CPT-11 at 48 and 55 feet bsg, respectively. <br /> 04/16/99 Date of Monitoring Well and CPT Investigation Report covering February <br /> 1999 work. <br /> i <br /> 10/27-28/99 Monitoring wells MW-4A, MW-413, MW-5A, MW-513, MW-6A, MW-613 <br /> were installed during this time. <br /> 02/09/00 Date of Well Installation Report covering October 1999 work. <br /> 03/10/00 Date that extracting groundwater from"EW-1 began. <br /> 07/23/01 Date that groundwater extraction was terminated at this site. <br /> Approximately L. pounds of TPH-g and 15.2 pounds of MTBE were <br /> estimated to have been removed by groundwater extraction. <br /> 04/08/05 Date of last sample collection from monitoring wells per agreement with <br /> EHD. <br /> 07/25/06 Date of Fate and Transport Modeling Report. The VLEACH (Version <br /> 2.2.0.2) model was used to predict the mass of residual sorbed MTBE to <br /> be negligible and should not pose a significant threat to groundwater in the <br /> future. <br /> 11/14/06 Date of Closure Addendum - Vapor Intrusion Analysis. This report <br /> concludes that vapor intrusion does not appear to pose a threat at this site. <br /> 04/18/07 Date EHD staff discussed the site.with CVRWQCB staff for potential site <br /> closure concurrence. <br /> iI <br />