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! 31 August 2000 AGE Project No 96-0232 ! Page 14 of 25 ! (Appendix E) ! 4.0. PROPOSED GROUND WATER REMEDIATION TECHNOLOGY The primary objective of the proposed ground water extraction and treatment system (pump and ! treat)is to prevent the migration of hydrocarbons off-site, especially that of MTBE, and to remediate petroleum hydrocarbon-Impact to ground water to regulatory satisfaction Pump-and-treat systems are effective in areas of shallow ground water Impacted by MTBE Based on these conditions, this ! method of remediation appears to be the most cost effective method to commence with ground water treatment at this site ! 4 1 PROPOSED GROUND WATER TREATMENT SYSTEM ! Based upon the results of the investigation detailed in the Problem Assessment Report,dated 19 June 2000, and ground water pump test results detailed in sections 3 1 , 3 2 and 3 3 , AGE recommends a six-stage pump-and-treat system The first three stages of the pump and treat system will utilize three 2,000-pound canisters of granular activated carbon(GAC)to address TPH-g,TPH-d and BTEX in extracted ground water, the final three stages will address MTBE utilizing three 2,500-pound ! canisters of SunSolve, a patented material that has an affinity to absorb MTBE A schematic diagram of the GAC/SunSolve ground water treatment system is depicted in Figure 8, additional Information is in Appendix I Treated water will be discharged Into a conveyance ditch located approximately ! 500 feet south of the site via underground pipe, the conveyance ditch discharges Into the White Slough AGE proposes to operate a "pump and treat" system within the First Zone Aquifer until a point of diminishing returns is achieved It has been AGE's experience that the point of dinunishmg ! returns is achieved when the resulting concentrations maintain a range with less than 10%variability for six consecutive months ! 4 1 1 Ground Water Remediation Pilot Study Utilizing GAC/SUNSOLVE ! AGE is currently operating a GAC/SunSolve ground water pump and treat system at the Fortner Texaco/Big Bear Chevron Service Station, 40553 Big Bear Boulevard, Big Bear Lake, California Interim remedial activities are being performed in accordance with California Regional Water ! Quality Control Board - Santa Ana Region(RWQCB-SAR) Cleanup and Abatement Order No 98- 112 The GAC/Sunsolve ground water treatment system extracts MTBE-impacted ground water and ! filters it through a four-stage carbon/SunSolve media process Following filtration, the processed water Is discharged Into the City of Big Bear Lake sanitary sewer system The GAC/Sunsolve Ground Water Pump and Treat system was activated on 13 June 2000 An ! Advanced GeaEnvironment4 Inc. I