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ExxonMobil Global Services Page ii <br />Colony Shale Oil Project <br />ESR Reclamation Studies <br />• Weighing Lysimeter Performance 1990-2003 <br />Project No. 353 <br />TABLE OF CONTENTS <br />1.0 INTRODUCTION .......................................................................................................................................1 <br />2.0 PROJECT UNDERSTANDING AND SCOPE OF WORK ...............................................................1 <br />3.0 PROJECT BACKGROUND .....................................................................................................................2 <br />3.1 Historical Overview of Spent Shale Revegetation Studies for Commercial Projects ....2 <br />3.1.1 Mining Permits Required .......................................................................................... 2 <br />3.1.2 Protection of Surface and Groundwater ................................................................... 3 <br />3.1.3 Topsoil Cover Required ............................................................................................ 4 <br />3.1.4 Impacts of Transition to Higher Temperature (Fluid bed) Combusting Retorts... 6 <br />3.2 Overview of Previous Water Balance Studies Applicable to this Project .......................8 <br />• 3.3 Extension of Previous Studies to Colony .......................................................................I 1 <br />4.0 ANALYSIS AND CONCLUSIONS ........................:............................................................................13 <br />4.1 Overview of Wafer Balance Findings ............................................................................. 13 <br />4.2 Comparison to EPA's HELP Model ............................................................................... 17 <br />4.3 Year-by-Year Summary Narrative .................................................................................. 18 <br />4.3.1 1990 through YE 1992 ............................................................................................ 18 <br />4.3.2 1993 .......................................................................................................................... 19 <br />4.3.3 1994 through YE 1996 ............................................................................................ 20 <br />4.3.4 1997 .......................................................................................................................... 20 <br />4.3.5 1998 through YE 2000 ............................................................................................ 21 <br />4.3.6 20011hroughYE 2002 ............................................................................................. 22 <br />4.3.7 2003 .......................................................................................................................... 22 <br />5.0 RECAP OF FINDINGS AND CONCLUSIONS .................................................................................23 <br />6.0 MATERIALS REFERENCED ..........................................................................:....................................26 <br />7.0 LIIv11TATIONS ..................................................................:.......................................................................27 <br />.• <br />LACHEL FELICE & Associates <br />