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' Brolog+cal mxl Fnherre�Rexmrcer Evaluation am/ Wetland Delmeahon Report Weber Petal Smth&mk Sea ll Project Cory of 4mckron CA ' I. SUMMARY OF FINDINGS AND CONCLUSIONS There will be no biological impacts as a result of the proposed project Approximately 0 02 acre of waters of the United States will be temporarily affected and 0 06 acre permanently II ' filled in Stockton Channel as a result of constructing the new seawall This impact is not considered significant Construction of the project will result in a positive long-term benefit because the new seawall will prevent the potential failure and/or slumping of portions of the ' existing seawall into Stockton Channel ' II. INTRODUCTION A Project Description ' The Weber Point Southbank Seawall Protect consists of structural modifications to approximately 835 lineal feet of existing concrete seawall bordering the south side of Weber Point in Stockton, CA(Figure 1, Stockton West quadrangle, T1N, R16E, Photographs, Exhibit 1) 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 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 sheet pile 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 sheet pile wall to the existing concrete wail with a common concrete cap and concrete fill between the new sheet pile and the existing wall, and 5) place rock rip-rap on the channel bottom adjacent to the waterside of the sheetpile Note Rip-rap is included in the project description to define the worst-case scenario However, the potential exists that rip-rap may not be used ' The protect study area includes three components 1) an 835 foot long, ±three-foot wide seawall, 2) a±three-foot wide portion of Stockton Channel on the south side of, and adjacent to the seawall, and 3) a± 100-foot wide portion of land on the north side of, and adjacent to the ' seawall Rock rip-rap could potentially be placed at the base of the new seawall to stabilize the channel bottom adjacent to the seawall If rock rip-rap is used, the project study area would extend up to an additional 30 feet into the channel (Sheet 4, Appendix A) Two 75 foot long stair sections will be incorporated into the seawall to facilitate access to the Stockton Channel The project study area does not include any other portion of Weber Point Siegfried Engineering, Inc has prepared engineering drawings of the project's primary ' features These drawings, Sheets 1 through 6, are included in this document Sheet 1, a vicinity map, is Figure 1 of this document Sheet 2 is a project site map Sheet 3 is a plan view of the proposed seawall improvements showing the location of the seawall and stair section profiles The seawall section is shown in Sheet 4, the stair section is shown in Sheet 5, and Sheet 6 is a drawing of the top of wall elevation transition section Sheets 2 through 6 are presented in Exhibit 6 Duplicates of sheets 1 through 6 are also included in the ' Expanded Initial study (see following paragraph) SEA-8104 DOC 9118197 Sycamore Environmental Consultants Inc .� i