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I. Introduction ' The purpose of this Expanded Initial Study for the Weber Point Southbank Seawall Project is to descnbe the proposed project and to discuss the potential impacts associated with construction and operation of the seawall The City of Stockton will submit this Expanded Initial Study to the State Clearinghouse for ' distribution to appropriate agencies tl. Expanded Initial Study A. Project Description ' The Weber Point Southbank Seawall Project consists of structural modifications to approximately 835 lineal feet of existing concrete seawall bordering the south side of Weber Point in Stockton,CA(Sheet I and 2,Appendix A) The purpose of the project is to construct the structural improvements necessary to ' insure long-term performance of the wall,provide a stable subgrade behind the wall for the purpose of constructing future Weber Point Park surface improvements,and improve the wall's overall aesthetic appearance A section of stairs will be constructed into the seawall(Sheets 3,5,Appendix A) The completed project will greatly enhance the wall's appearance and is considered a key element in the City of ' Stockton's overall downtown redevelopment efforts The project's primary features include 1)lowering the existing concrete seawall and grade behind the wall by as much as five(5)feet in order to reduce earth pressures pushing outward on the wall,2)construct a new steel sheetpile wall on the water side of the existing wall to architecturally match the previously improved seawalls around Weber Point,McLeod Lake,and the North Bank of the Stockton Channel, 3)fill the eroded voids under the existing wall,4)structurally bond the new sheetpile wall to the existing concrete wail with a common concrete cap and concrete fill between the new sheetpile and the existing wall,and 5)place rip-rap on the channel bottom adjacent to the waterside of the sheetpile ' B. Location The project study area is located adjacent to Stockton Channel within the City of Stockton, San Joaquin ' County,CA The project is situated in the Central Valley of California within the urban boundary of the City of Stockton, in San Joaquin County,CA The project study area is bordered by Center Street on the east and Weber Avenue on the south 1 C. Environmental Setting ' The project study area is located on the south side of Weber Pomt at the east end of the Stockton Channel of the San Joaquin River and is limited to the existing seawall adjacent to Stockton Channel(Sheets 2,3, Appendix A) Elevation of the project study area is approximately 12 feet ' The open water portion of Stockton Channel terminates at Center Street Land uses within or adjacent to the project study area include an ARCO gas station and an abandoned parking lot The area bounded by the seawall,Center Street, and Weber Avenue is accessible to small boats,such as row boats,paddle ' wheels,etc The existing seawall is a concrete wail approximately 835 lineal feet long Two open-ended concrete culverts and one metal pipe are located in the seawall Five wooden pilings are situated in Stockton Channel at the east end of the project study area A three foot wide portion of Stockton Channel,a waters of the U S, is included in the project study area Rock rip-rap could potentially be placed at the base of the EX-1-04 DOC 9/25/97 1 I 1