113 STAT. 334 PUBLIC LAW 106-53—AUG. 17, 1999 pursuant to section 5 of the Watershed Protection and Flood Prevention Act (16 U.S.C. 1005), substantially in accordance with the Natural Resources Conservation Service watershed plan for Llagas Creek, Department of Agriculture, and in accordance with the requirements of local cooperation as specified in section 4 of that Act (16 U.S.C. 1004), at a total cost of $45,000,000, with an estimated Federal cost of $21,800,000 and an estimated non-Federal cost of $23,200,000. (b) THORNTON RESERVOIR, COOK COUNTY, ILLINOIS.— (1) IN GENERAL.— The Thornton Reservoir project, an element of the project for flood control, Chicagoland Underflow Plan, Illinois, authorized by section 3(a)(5) of the Water Resources Development Act of 1988 (102 Stat. 4013), is modified to authorize the Secretary to include additional permanent flood control storage attributable to the Natural Resources Conservation Service Thornton Reservoir (Structure 84), Little Calumet River Watershed, Illinois, approved under the Watershed Protection and Flood Prevention Act (16 U.S.C. 1001 et seq.). (2) LIMITATION.—No funds may be obligated to carry out work under the modification under paragraph (1) until completion and approval by the Secretary of a final report by the Chief of Engineers finding that the work is technicedly sound, environmentally acceptable, and economically justified. (3) COST SHARING.— Costs for the Thornton Reservoir project shall be shared in accord£ince with section 103 of the Water Resources Development Act of 1986 (33 U.S.C. 2213). (4) TRANSITIONAL STORAGE.— The Secretary of Agriculture may cooperate with non-Federal interests to provide, on a transitional basis, flood control storage for the Natural Resources Conservation Service Thornton Reservoir (Structure 84) project in the west lobe of the Thornton quarry. (5) CREDIT TOWARD NON-FEDERAL SHARE.— The Secretary may credit toward the non-Federed share of the costs of the Thornton Reservoir project all design and construction costs incurred by the non-Federal interests before the date of signing of the project cooperation agreement. (6) REEVALUATION REPORT.— The Secretary shall determine the credits authorized by paragraph (5) that are integral to the Thornton Reservoir project and the current total project costs based on a limited reevaluation report. SEC. 502. ENVIRONMENTAL INFRASTRUCTURE. (a) IN GENERAL.—Section 219(e) of the Water Resources Development Act of 1992 (106 Stat. 4835; 110 Stat. 3757) is amended by striking paragraphs (5) and (6) and inserting the following: "(5) $25,000,000 for the project described in subsection (c)(2); "(6) $20,000,000 for the project described in subsection (c)(9); "(7) $30,000,000 for the project described in subsection (c)(16); and "(8) $30,000,000 for the project described in subsection (c)(17).". (b) ADDITIONAL ASSISTANCE. —Section 219 of the Water Resources Development Act of 1992 is amended by adding at the end the following:
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