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4.0 BESTAVAILABLE TECHNOLOGY 16 <br /> 4.1 SOIL REMEDIATION 16 <br /> 4.2 GROUND WATER REMEDIATION 16 <br /> 5.0 ASSESSMENT OF RISK AND BENEFICIAL USES 18 <br /> 5.1 IDENTIFICATION OF CONSTITUENTS OF POTENTIAL CONCERN 18 <br />' 5.2 IDENTIFICATION OF REALISTIC EXPOSURE PATHWAYS 19 <br /> 5 2 1 Land Use 19 <br /> 522 Soil 19 <br />' <br /> 523 Ground Water 20 <br /> 524 Summary of Realistic Exposure Pathways 21 <br />' 53 DEVELOPMENT OF SITE-SPECIFIC SCREENING LEVELS 21 <br /> 5.4 HRA RESULTS 23 <br /> 541 Soil 23 <br /> 542 Ground Water 23 <br /> 5.5 HRA CONCLUSIONS 24 <br />' 6.0 CONCLUSIONS 25 <br /> 7.0 WELL ABANDONMENT 26 <br />' <br /> 8.0 REFERENCES 27 <br /> APPENDIX A — TRI-REGIONAL RECOMMENDATIONS CHECKLIST OF <br />' REQUIRED DATA FOR CLOSURE OF UNDERGROUND TANK SITES <br /> APPENDIX B — CALCULATION OF MASS REMOVED AND REMAINING AT EACH <br />' FORMER TANK SITE <br />' APPENDIX C—DEMONSTRATION OF BIODEGRADATION CAPACITY <br /> 1 <br />' i1 <br />