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1 KLE/NFELDER <br /> engne novi-.acne somno.. <br /> WORK PLAN <br /> Limited Soil Assessment <br /> Sulfuric Acid Spill Area <br /> Thermal Energy Development Partners <br /> 14800 West Schulte Road <br /> Tracy, California <br /> BACKGROUND <br /> Kleinfelder understands that an approximate 2,000 gallon above ground storage tank <br /> (AST) containing sulfuric acid has been in use at the project site for some time and has <br /> recently been removed from the site. Kleinfelder observed during a site visit that the <br /> AST area included a concrete secondary containment structure. The concrete flooring <br /> appeared to have been corroded from acid spills from past AST operations. <br /> Kleinfelder was supplied with a letter report by Universal Environmental Inc. titled <br /> "Preliminary Site Assessment Plan for Thermal Energy Development," dated <br /> September 26, 2007. This report included soil sampling activities which occurred within <br /> and near the AST, including a background location. Soil samples were collected at <br /> depths of 16 inches and 3 feet below ground surface (bgs). pH values beneath the <br /> AST and within the containment structure were noted to be 0 pH Units from field <br /> measurements and less than 2.0 pH Units from laboratory testing. Three perimeter <br /> samples collected approximately five feet from the containment wall had reported pH <br /> values ranging from 7.32 to 8.14 (laboratory data). The background soil sample <br /> collected approximately 20 feet from the containment structure had a reported pH value <br /> of 7.81. <br /> This work plan is for the purpose of delineating potential sulfuric acid impact in soil <br /> beneath the former AST and containment area at the site. <br /> PROPOSED SERVICES <br /> The following tasks detail Kleinfelder's proposed services based upon our <br /> understanding of current site conditions, our site visit and information provided to <br /> Kleinfelder from Universal Environment Inc.: <br /> 97054.T1/ST08P785 August 29,2008 <br /> 0 2008 Kleinfelder Page 1 of 5 <br />