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Working To Restore Nature <br /> TABLE OF CONTENTS <br /> CONTENT PAGE <br /> ' 1.0 INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 <br /> ' 2.0 BACKGROUND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 <br /> 2.1 Site Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . i <br /> 2.2 Proximity of Private, Municipal, and Imgation Wells . . . . . . . . . . . 1 <br /> 3.0 REGIONAL GEOLOGY AND HYDROLOGY . . . . . . . . . . . . . . . . . . . . . 2 <br /> 4.0 PREVIOUS WORK . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 <br /> 4.1 Underground Tank Removal . . . . . . . . . . . . . . . . . . . . 3 <br /> ' 4.2 Subsurface Investigation . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 <br /> 5.0 INTERIM REMEDIATION AND EVALUATION . . . . . . . . . . . . . . . . . . . 4 <br /> ' 5.1 Excavation Activities . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . <br /> • . . . 4 <br /> 5.2 Groundwater Pumping Test . 5 <br /> 5.2.1 Static Water Levels . . . . . . . . . . . . . . . . . . . . . . . . . . 5 <br /> 5.2.2 Step Drawdown Test . , b <br /> 5.2.3 Constant Rate Test . . . . . . . . • . . . . . . . <br /> . . . , , . . , <br /> 7 <br /> 5.2.4 Data Evaluation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 <br /> ' 6.0 SITE CHARACTERIZATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 <br /> 6.1 Site Geology . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 <br /> ' 6.2 Site Hydrology . . . . . . . . . . . . . . 13 <br /> . . . . . . . . . . . . . . . . . . . . . . . <br /> 6.3 Residual Hydrocarbons in Soil 13 <br /> 6.4 Dissolved Hydrocarbons in Groundwater . . . . . . . . . . . . . . . . . . . 14 <br /> 6.5 Toxicity, Persistence and Potential for Contaminant Migration . . . . . . . . 14 <br /> 7.0 REMEDIATION ALTERNATIVES . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 <br /> ' 7.1 Alternative 1 - Passive Remediation . . . . . . . . . . . . . . . . . . . . . . 16 <br /> 7.2 Alternative 2 - Soil Vapor Extraction with Groundwater Extraction . . . . 16 <br /> 7.3 Alternative 3 - Groundwater Extraction and Passive Soil Remediation . . 17 <br /> ' 8.0 REMEDIATION ALTERNATIVES EVALUATION . . . . . . . . . . . . . . . . . 17 <br /> 8.1 Alternative 1 - Passive Remediation . . . . . . . . . . . . . . . . . . : : : . 18 <br /> 8.2 Alternative 2 - Soil Vapor Extraction with Groundwater Extraction 19 <br /> 8.3 Alternative 3 - Groundwater Extraction and Passive Soil Remediation . . . 21 <br /> 1 <br /> 1500381REPORIWAF 0794 DRF <br />