SITE INFORMATION AND CORRESPONDENCE

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17 November 2006 AGE-NC Project No. 01-0865 Page 4 of 5 carbon in vessel number 2 required change-out.Neither GAC vessels number 3 or 4 were reported with concentrations of TPH-g and MTBE above laboratory detection levels indicating the carbon in both vessels did not require change-out. TBA simply broke through GAC vessels 1 through 4 in rapid succession. AGE has taken immediate steps to ensure TBA or other constituents of concern do not breakthrough the treatment system and discharge to surface waters as follows: • The interim remediation system was shutdown on 14 November 2006 within hours of receiving the laboratory report with detections of TBA in the influent. Re-sampling of the influent, between vessels and effluent was performed. • The CVRWQCB (Mr. Negrete) was notified on 14 November of the TBA breakthrough. • Carbon change-out for all vessels was performed on 16 November 2006. • On 16 November 2006, AGE sampled discharge points at R-2 and directly below the point of discharge pipe for TBA in accordance with EPA Method 826013;discharge point R-1 was dry. TBA was not reported in the samples collected from R-2 or directly below the point of discharge pipe (POD). • Bio-filters were ordered for all vessels to enhance oxygenate breakdown and adsorption, specifically targeting TBA.The bio-filters will be installed in each vessel immediately upon receipt. • A 6,500-gallon capacity Baker tank will be placed after GAC vessel number 4. During the first week after re-start of the interim remediation system, treated wastewater will be temporarily stored on-site in the Baker tank and sampled and analyzed for specific General Permit constituents of concern: no additional wastewater will be processed until the laboratory results are received (24-hour turn around time). Upon receipt of the laboratory report and no reported detections above laboratory detections levels,the wastewater will be discharged to surface waters. • After the first week of the re-start of the interim remediation system, AGE will process the extracted ground water through the interim remediation system and discharge to surface waters.AGE will sample the influent,between vessels and effluent weekly for the first two weeks and monthly thereafter. Each sample will be submitted to the laboratory with a 24- hour turn around time. • If constituents of concern are reported in the effluent or between vessels, the interim remediation system will be immediately shut-down and the system design re-evaluated for effectiveness and feasibility of operation at this site. Advanced GeoEnviron rental,Inc.