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CAMBRIA <br /> Date Title/Subject Company <br /> 2/7/92 Results Report for Air Monitoring of Extended Pilot Vapor Aegis <br /> Extraction Test <br /> 1/6192 Results Report for Air Monitoring of Extended Pilot Vapor Aegis <br /> Extraction Test <br /> 12/2/91 Proposed Workplan for Limited Subsurface Investigation Aegis <br /> 4/23/91 Comments re well installation report SJCPHS-EHD <br /> 3/5/91 Monitoring Well Installation Results Report Aegis <br /> 6/14/90 Tank Closure Results Reporl/Work Plan Pilot Vapor Extraction Aegis <br /> System/Hydrogeologic Assessment(Preliminary Report) <br /> 11/15/89 Pre-Tank Replacement Site Assessment Results Report Aegis <br /> 11, Best Available Technology(BAT) used or an explanation for not using BAT; <br /> An extended soil vapor extraction test was performed at the site during December 1991 through <br /> January 1992 Reports summarizing this test are included in Attachment B No other remedial <br /> • technology was utilized at this site as hydrocarbon levels did not warrant remediation <br /> 12 Reasons why "background"waslis unattainable using BAT; <br /> Background levels at the site have been attained for TPHg and BTEX TPHg and BTEX have not <br /> been detected in groundwater samples collected from the site wells since August 1999 In addition, <br /> MTBE concentrations have been below 5 ppb in all site wells since May 1999 <br /> 13. Mass balance calculation of the substance treated versus that remaining; <br /> Mass balance calculations representing site soil conditions prior to remediation are attached <br /> (Attachment G) As discussed above, no soil samples have been collected at the site since 1991 <br /> Therefore, a mass balance calculation for current site conditions could not be prepared Using <br /> conservative assumptions detailed in Attachment G, Cambria estimates that up to 759 pounds of TPHg <br /> and 3 pounds of benzene may have been present in soil before soil vapor extraction <br /> 14 Assumptions, parameters, calculations and model used to risk assessments, and fate and <br /> transport modeling, <br /> • Not applicable, no models were used <br />