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CONTENTS RECEIVED <br /> 1 MAR 21992 <br /> ENV IRON�f:NTAI., �1E.tAIJH <br /> r PERM! MCL tPage <br /> VOLUME 1 <br /> Executive Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . <br /> i 1 Introduction . . . . . . . . . . . . . . . . . 1-1 <br /> Objeetives . . . . . . . . . . . . . . . . . . 1-1 <br /> i ! Background . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1 <br /> Site:Aescription . . . . . . . . . . . . . . . . . . . . . . . . 1-1 <br /> Site History. . . . . . . . . . . . . . . . . . . . . . . 1=4 <br /> 1 Previous Investigations . . . . , . . . . . . . 1-4 <br /> Environmental.Setting . . . . .. . . . : . . . . . . . . . 1-6 <br /> Regional Geology .. :.. . . . . . . . . . . . . . . . 1-6 <br /> Local= Geology . . . . . . . . . . . . . . . 1-6 <br /> .Regional Groundwater Occurrence and Flow .. . . . . . . . . . . . . . . . 1-6 <br /> 2 Field Investigation and Methodolpgies`... . .. . . . . . . . . . .. . .. . . . . . . . . . 2-1 . <br /> Soil Gas Survey . . . . . . . . . . . . . . . . . . . . . . 2-1 <br /> r Subsurface Soil Sampling: . . . .. .. . ... . . . . . . . . . . . . . . . . . 2-1 <br /> Groundwater Mgnitaring Wells. . . . . . . . . . . . . . . 2-3 <br /> Area Well Location:Survey . . . . . . . -6 <br /> Waste Management . . . . . . . . . . . . . . . . . . . . . 2-6 <br /> 3 Results . . . . . . . . . . .3-1 <br /> { Local Geology . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . 3-1 <br /> . Hydrology` . . . ... . . . . . . . . . . . . . . . . . . . . . 3-4 <br /> Shallow Groundwater Movement . . . . . . . . . . . . . . . . . 3-7 <br /> Soil Investigation Results . . . . . . . . . . . . . . . 3-7 <br /> ., <br /> Soil-Sample Analy�ical.Results . . . . 3-7 <br /> Groundwater Investigation.Resu-lts . . . . . . : . . . . 3-12 <br /> Applicable.Regulations,:and Guidelines . . . . . . . . . . . .--:-3-17 <br /> t 1 . . <br /> 4 Feasibility Study . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1 <br /> ( � Summary of RI Findings . . . . . 41 <br /> l Remedial Action"Objectives . . . . . . . . . . . . . . . . . . `4-2 <br /> Remedial Teehnologjes. . . . . . . . . . . . . . . . ;, . 4-3 <br /> fTechnology Descriptions . . ..r , . . . . . . . . . 4-3 <br /> Remedial Alternatives . . . . . . . . . . . . . . . . . . . . . . . . 4_6 <br /> Summary . . . . . . . . . . . . . . . . . . . . . . . .,... . . . . . . . . . . . 4-8 . <br /> r <br /> { <br /> 5F0316041RP1008.51 <br />