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Service Station #6100 QMR & QRPS 2Q06 August 31, 2006 . Page 5 REMEDIAL PERFORMANCE SUMMARY A summary of the remediation system O&M data, results of vapor monitoring, and an evaluation of the effectiveness of the SVE system is presented below SVE System Description and Operation The SVE system consists of a 40-hp liquid-ring pump, which routes extracted soil vapor from up to nine SVE wells (VW-1, VW-3, VW-4, VW-8, VW-14, MW-2, MW-4, MW-8, and MW-9) through a vapor-liquid separator and a Solleco Equipment, Inc 500 scfm thermal catalytic oxidizer In April 2006 the system vapor intake manifold was re-plumbed With this exception, only routine O&M, compliance sample collection, and field parameter measurement collection occurred during April, May, and June 2006 SVE System Monitoring In order to monitor the effectiveness of the SVE system, and ensure permit compliance, influent and effluent air samples are collected monthly During the second quarter 2006, vapor samples were collected from the total system influent, the oxidizer chamber influent, and the system exhaust on April 4, May 2, and June 6, 2006 The air samples were analyzed by Severn Trent Laboratories, Inc (STL) for GRO, BTEX, and MtBE using EPA Method 8260B Evaluation of the SVE System Performance The SVE system removed approximately 10,416 lbs of GRO and 128 lbs of benzene from the subsurface between March 1 and June 6, 2006 MtBE was not detected in the influent or the effluent vapor samples during the second quarter 2006 The current SVE system has removed approximately 78,378 pounds of GRO and 789 pounds of benzene since it began operation in May 2005 The previous system removed approximately 9,625 pounds of GRO from March 2004 to November 2004 The mass of benzene removed by the previous system 1s not known i 1 IBP-ARC0104 BP Valley Portfolio161001ReportsNQMRs16100 2Q2006 doc SECOR International incorporated