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• <br />ExxonMobil Global Services <br />Colony Shale Oil Project <br />ESR Reclamation Studies <br />Weighing Lysimeter Performance 1990-2003 <br />Project No. 353 <br />i <br />Page 1 <br />i <br />I <br />1.0 INTRODUCTION <br />LACHEL FELICE & Associates, Inc. (LFBcA) is pleased to present the results of our <br />evaluation of the Exxon Shale Retort {ESR) infiltration and evapotranspiration measurements <br />collected over the past 15 years in the weighing lysimeter at the Colony Shale Oil Project site in <br />northwestern Colorado. Our services were requested by Mr. Ron Smith of XOM Global Services on <br />August 3, 2006. <br />2.0 PROJECT UNDERSTANDINGANDSOOPE OF WORK <br />• <br /> <br />The opinions and recomnnendations provided are based on our understanding of this project as <br />summarized below. We developed our understanding of the project based on personal recollection of ~ <br />i <br />the principal investigator, review of available documents on the lysimeter, review of pertinent public <br />domain literature, and finally a detailed review and processing of site specific meteorological and <br />lysimeter measurements that ExxonMobil bas been collecting since 1990. ~ <br />The scope of this study is limited to evaluation of the performance of the weighing lysimeter, <br />and in particular, evaluating whether or not the Jensen-Raise evapo-transpiration model can be used to <br />extrapolate quantitative observations from that lysimeter for use in designing a prototype combusted <br />shale waste facility. The weighing lysimeter is only a part of a larger ESR reclamation research <br />program that includes evaluation of several real world constraints, such as suitability and availability ~ <br />of on-site topsoil to economically construct a self co_cta,ning permanent vegetative cover composed of <br />I <br />native plant species appropriate for the post-mining land use at the property. The ESR reclamation i <br />program also seeks to evaluate the quantity and quality of runoff and percolate water from ! <br />permanently reclaimed combusted shale disposal areas, which information would also be expected to <br />be considered in design of these disposal facilities. While the weighing lysimeter presents some <br />LACHEL FELICE & Associates ~ <br />