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ADDENDUM TO <br /> SUMMARY OF INVESTIGATION FINDINGS <br /> AND CLOSURE REPORT <br /> TABLE OF CONTENTS <br /> 1.0 INTRODUCTION I <br /> fI 1 PREVIOUS SITE INVESTIGATION AND REMEDIATION ACTIVITIES 1 <br /> 1 2 SUMMARY OF CLOSURE REPORT 3 <br /> 2.0 PETROLEUM HYDROCARBON RELEASE <br /> AND SITE CHARACTERIZATION INFORMATION 5 <br /> 2 1 CHEMICALS OF CONCERN 5 <br /> 22 SUMMARY OF GROUNDWATER CONDITIONS AT SITE <br /> AND VICINITY 5 <br /> 2 2 1 Site Hydrogeologic Conditions 5 <br /> 2 2 2 Municipal Supply Wells 6 <br />' 2 2 3 Regional Groundwater Level Fluctuations 6 <br /> 23 AREA SURFACE WATER 7 <br /> 2 3 1 Groundwater Recharge 7 <br />' 3.0 SOIL REMEDIATION INFORMATION 8 <br /> 3 1 COMPREHENSIVE SUMMARY OF CHEMICALS IN SITE SOILS 8 <br /> 32 SUMMARY OF TANK REMOVAL ACTIVITIES 8 <br /> 3 3 ESTIMATES OF AFFECTED SOIL VOLUMES REMAINING 9 <br /> 3 3 1 Former Tank Pit Area 9 <br /> 3 3 2 Former Septic Leach Area 10 <br /> 34 WATER QUALITY IMPACT MODELING(SESOIL) 10 <br />' 3 4 1 Modeling Assumptions 11 <br /> 3 4 2 Modeling Results 1 I <br /> I4.0 GROUNDWATER CHARACTERIZATION INFORMATION 13 <br /> 41 SUMMARY OF FINAL QUARTERLY MONITORING EVENT 13 <br />' <br /> 42 COMPREHENSIVE SUMMARY OF CHEMICALS IN <br /> SITE GROUNDWATER 14 <br /> 43 REVIEW OF PRESENCE OF PCE AND 1,2 DCA 14 <br /> I4 3 1 VOC Sources 14 <br /> 4 3 2 Review of Potential Source Areas 15 <br /> I <br /> 44 ESTIMATES OF AFFECTED GROUNDWATER VOLUMES 15 <br /> 45 FATE AND TRANSPORT OF 1,2 DCA 16 <br /> 5.0 RECOMMENDATION FOR SITE CLOSURE 17 <br /> 6.0 REFERENCES 19 <br /> u <br />