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® 1117 Lone Palm Avenue,Suite 201 <br /> Modesto,California 95351 <br /> ATC 209-579-2221 <br /> Fax:209-579-2225 . <br /> Shaping the Future <br /> TABLE OF CONTENTS <br /> CONTENT PAGE <br /> 1.0 INTRODUCTION....................................... .... .......................................l <br /> 1.1 Site Background..................................... .. ........ ..... ........................................1 <br /> 2.0 GEOLOGY .....................:....................:.........:........................:..........:...........................................4 <br /> 2.1 Regional Geology............................. 4 <br /> 3.0 HYDROGEOLOGY..................................................:..:............::..................................................4 <br /> 3.1 Regional H dro eolo <br /> 4.0 INDOOR AIR RISK ASSESSMENT..........:.................:..............................................................5 <br /> 4.1 Tier 1 Evaluation..............................::.............................:..................................................5 <br /> 4.2 Tier 2 Modeling ..... ........................ ......::.......................................................................6 <br /> 5.0 ESTIMATED HYDROCARBON MASS VOLUME.................................................................6 <br /> 5.1 Contaminant Mass Distribution in'Soil :... :...:..........6 <br /> 5.2 Contaminant Mass Distribution in Water..:.. .....:. ................7 <br /> 5.3 Mass Calculations for Site Specific Compounds.:;.:.......::........::.:..................::...................7 <br /> 5.4 Mass Calculation Assumptions for Soil and Groundwater..................................................7 <br /> 6.0 SENSITIVE RECEPTOR SURVEY.................................. ..................... ................................8 <br /> r7.0 LOW RISK CLOSURE CRITERIA ........ ............................................ .................. .........9 <br /> �r <br /> 8.0 CONCLUSIONS....................................................:..........:...........................................................12 <br /> 9.0 RECOMMENDATIONS............................... .................................:............................:.... ........12 <br /> i <br /> L <br /> L S:Environmental\22493\Reports\closure sunimary.doc <br /> 1 <br /> I� <br />