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LSA ASSOCIATES. INC. CEQA INITIAL STUDY /MITIGATED NEGATIVE DECLARATION MARCH 1011 PREDA STREET PIP! BRIDGES UPGRADE SAN LEANDRO, CALIFORNIA Leandro Reservoir. San Leandro Creek continues downstream from the Upper San Leandro Reservoir to Lake Chabot and through the cities of San Leandro and Oakland before discharging into San Francisco Bay near the Oakland International Airport. The project site is within the FEMA 100 Year Flood Zone (ABAG 2009). Discussion: a) Violate any water quality standards or waste discharge requirements? Less Than Significant with Mitigation Incorporated. The long - term operational and short construction impacts of the proposed project are described below. Long - Term Operational Impacts. The proposed project would replace two existing sewer pipes and rehabilitate two supporting pipe bridges that span San Leandro Creek. After project completion, the proposed project would help prevent water quality violations by reducing the risk of a sewer pipe leak during seismic and flood events. Thus, the proposed project would not contribute to a degradation of water quality in the project area or violate any water quality standards or waste discharge requirements. Short - Term Construction Impacts. Construction of the proposed project would cause disturbances to the ground surface from earthwork, including excavation, grading and removal of vegetation. These activities could potentially increase the amount of sediment in site runoff flowing into San Leandro Creek. Increased sediment could negatively impact water quality and aquatic life downstream of the project site. However, all construction activities would be conducted when San Leandro Creek is dry between June I and October 15 (Mitigation Measure BIO -l). In addition, the proposed project would implement Best Management Practices to minimize disturbance to San Leandro Creek. BMPs would include erosion control measures, including a wire reinforced silt fence and installation of construction fencing. In addition, a drop cloth would be suspended below the bridges during the bridge retrofit to prevent debris from falling into the creek channel. In addition, Mitigation Measure BIO -4 requires the in -kind replacement of native trees removed during construction and would help reduce the impact of erosion to a less than significant level. Construction of the proposed project may include the use of hazardous materials that are potentially harmful to aquatic resources and water quality. Accidents or improper use of these materials could release contaminants to the environment. Additionally, oil and other petroleum products used to maintain and operate construction equipment could be accidentally released. Project development would conform to all requirements of the Regional Water Quality Control Board, Uniform Building Code, and the City of San Leandro Municipal Code Chapter 3 -15 (Storm Water Management and Discharge Control) and would not result in unpermitted discharges into the sanitary sewer and stormwater systems. In addition, implementation of Mitigation Measure HAZ -I would protect water quality in the event of an accidental release of hazardous materials. Thus, the project would not violate any water quality or waste discharge standards. b) Substantially deplete groundwater supplies or interfere substantially with groundwater recharge such that there would be a net deficit in aquifer volume or a lowering of the local groundwater P:1EGI0801 \CEQA'Prede_FINAL IS- MND.doc(03/28 /II) 38