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' TABLE OF CONTENTS <br />' CONTENT PAGE <br /> 10 INTRODUCTION . ,. . . ... ..... ... 1 <br /> 20 BACKGROUND. . ... .... .... . . . ... .. ... .. .. .... .. .1 i <br /> 2 1 SITE DESCRIPTION 1 <br /> 22 PROXIMITY OF PRIVATE, MUNICIPAL, AND IRRIGATION WELLS 1 <br /> 3 0 REGIONAL GEOLOGY AND HYDROLOGY .. .. .. 2 <br />' 4 0 PREVIOUS WORK. . . . . .... 3 <br /> 41 UNDERGROUND TANK REMOVAL 3 <br />' <br /> 42 SUBSURFACE INVESTIGATION 3 <br /> 43 EXCAVATION ACTIVITIES 4 <br /> 44 GROUNDWATER PUMPING TEST 4 <br /> 45 ADDITIONAL SUBSURFACE INVESTIGATION 5 <br /> 5 0 SITE CHARACTERIZATION ..6 <br /> 51 SITE GEOLOGY 6 <br /> 52 SITE HYDROLOGY 6 <br /> 5 3 RESIDUAL HYDROCARBONS IN SOIL 6 <br /> 54 DISSOLVED HYDROCARBONS IN GROUNDWATER 7 <br /> 55 TO\ICITY,PERSISTENCE AND POTENTIAL FOR CONTAMINAVNT MIGR-XTION 7 <br /> 6 0 POTENTIAL REMEDIATION ALTERNATIVES 9 <br /> 6 1 ALTERNATIVE I -GROUNDWATER E\'TRAC FION AND TREATMENT 10 <br /> 62 ALTERNATIVE 2 -GROUNDWATER E\'TRACTION WITH AIR SPAR(jlN(+/SOIL VAPOR E\TRACTION 1{1 <br /> 63 ALTERNATIVE 3 —ENHANCED NATURAL ATTENLIATION 10 <br /> 6 4 ALTERNATIVE 4—NATURAL ATTENUATION I I <br /> 7 0 REMEDIATION ALTERNATIVES EVALUATION „ 11 <br /> 71 ALTERNATIVE 1 - GROUNDWATER EN'TRACTION AND TRFATNIENT 11 <br /> 72 ALTERNATIVE 2 -GROUNDWATER ENTRACTION WITH AIR SPARCIINCJ/SOIL VAPOR EXTRACTION 13 <br />' 7 3 ALTERNATIVE 3 —ENHANCED NATURAL ATTENUATION 15 <br /> 7 4 ALTERNATIVE 4—NATURAL ATTENUATION 17 <br /> 110 PROPOSED REMEDIATION ALTERNATIVE 18 <br /> 9 0 PROPOSED SCOPE OF WORK, .. 19 <br />' 9 l WELL DESTRUCTION 19 <br /> 9 2 ORC INSTALLATION 19 <br /> 9 3 GROUNDWATER MONITORING 19 <br /> 10 0 REFERENCES 20 <br /> 1 <br /> 6 IDem1(.RUIINDZLIKN0WlXS HAM\Rf_PORTSkrLagibihtyReport do, <br /> 1 <br />