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Ri <br /> A S S O C I A T E S I N C <br /> TABLE OF CONTENTS <br /> CONTENTS PAGE <br /> 1.0 INTRODUCTION..............................................................................1 <br /> 2.0 BACKGROUND................................................................................1 <br />' 21 General . ... .. .. .. .. . ..... . ...... ..... .. ..: . 1 <br /> 2 2 Regional Geology and Hydrogelology . .2 <br /> 2 3 Site Geology and Hydrogelology .... .. ..3 <br />' 3.0 SUMMARY OF SOIL AND GROUNDWATER CONDITIONS.....................3 <br /> 3.1 Extent of Hydrocarbon-Impacted Soil ... ..... ... ..3 <br />' 32 Extent of Hydrocarbon-Impacted Groundwater. ... ..... .. ..3 <br /> 4.0 PILOT TESTING PROCEDURES AND RESULTS....................................4 <br />' <br /> 41 Vapor Extraction/Air Sparge Testing - November 23 and 24, 1998.... . 4 <br /> 4.1 1 Methods and Procedures . . . ... .. ..... .... .. ..4 <br /> 4.1.2 Results .. . . . ....... .. ......... ..... .. ..4 <br /> 4.1 3 Conclusions .. ....... .. ... .... .... ..... . 5 <br /> 4.2 Well Abandonment - February 17, 1999 . . .. .... ..... . ... . . . 5 <br /> 4.3 Vapor Extraction/Air Sparge Testing - April 22, 1999 ..... .. . . . 6 <br /> 4.3.1 Methods and Procedures . .. . . .. ...... ... .6 <br /> 4.3 2 Results ...... . .. ... . .. . .. . ... .. ... ... .6 <br /> 4.3 3 Conclusions .. .. , ... .7 <br /> 44 Air Sparge Testing - June 30, 1999 .. ..... .. .. .7 <br /> 4.4 1 Methods and Procedures .. .. ......... .. ...... ....... . ...7 <br />' 4 4.2 Results .. ............. <br /> .. .. .. .. ......... .. .. ...... .......... ... 8 <br /> 4 4 3 Conclusions . 8 <br />' 5.0 REMEDIAL ALTERNATIVES .............................................................8 <br /> 5 1 Natural Attenuation with Groundwater Monitoring . 8 <br /> 52 Groundwater Extraction with Soil Vapor Extraction ........ ... .. ... .9 <br />' 53 In-Situ Air Sparging with Soil Vapor Extraction. .......... .... .. ... .9 <br /> 6.0 REMDIAL ALTERNATIVES EVALUATION...........................................10 <br />' 6.1 Natural Attenuation with Groundwater Monitoring.... . ... ... . . .. 10 <br /> 62 Groundwater Extraction with Soil Vapor Extraction... . .... ... . . .. 12 <br />' 63 In-Situ Air Sparging with Soil Vapor Extraction. .. . ... ... .. . 13 <br /> 7.0 RECOMMEDNATIONS ......................................................................14 <br /> 8.0 REFERENCES..................................................................................15 <br />