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POTENTIALLY ISSUES POTENTIALLY SIGNIFICANT LESS THAN NO SIGNIFICANT UNLESS SIGNIFICANT IIKPACT SOURCES ISSUES MITIGATION DAPACT INCORPORATED -LANATION: The applicant has retained Lowney Associates to prepare a Remedial Action Plan (RAP) due to the known rdous materials that exist on -site. Their analysis (included as an appendix to this document) indicates that due to previous industrial uses on the project site, the following potentially hazardous materials have beenoencountered i bihe n on -site soils and (PCBs) The will require remediation: a black sand fill, polynuclear aromatic hydrocarbons (PNAs), lead, p y P Y (P ) Lowney report indicates that PCBs above the residential preliminary remedial goal (PRG), as established by the Environmental Protection Agency, appear to be present in the upper approximately 1 to 2 feet of soil, although two locations were identified with PCBs above the cleanup goal at a depth of approximately 4 to 5 feet. Portions of the adjacent San Leandro Creek bank also will be excavated to a depth of approximately 1 to 5 feet to remove PCB concentrations above the residential PRG. The remediation work, which will involve removal of on -site soils to an appropriate landfill, will be performed with regulatory agency oversight (Regional ps of Engineers for work on the creek bank). A final RAP will be required to be Water Quality Control Board and possibly Army Cor submitted to the Regional Water Quality Control Board for approval prior to approval of the Final Map. Based upon preliminary laboratory analyses of ground water samples collected from the project site, ground water does not appear re have been significantly impacted by the historical site activities, meaning that contaminant levels detected are below significant thresholds. Staff notes that the method for ground water extraction did not obtain the proscribed depths, od [thane use efore additional testing the vicinity e required private in °rder to verify the preliminary findings. The project site is not located within an airport P airstrip, nor is it subject to wildland fires. The following mitigation measures are recommended in order to reduce potential impacts related to hazardous materials to a level of insignificance: Prior to Final Map approval, a final report that summarizes environmental impacts identified at the site and a Final Remedial Action Plan (RAP) to assess these impacts shall be submitted for review and approval by the Regional Water Quality Control Board, the Environmental Services Manager, the City Engineer, and the Development Services Director. The Final RAP shall indicate the location of all hazardous materials encountered, the amount of hazardous materials expected to be hauled off -site, a timeline for removal of contaminated soil and import of clean fill, and an assessment of groundwater quality as it relates to historical on -site uses. All recommendations contained in the Final RAP shall become conditions of project approval. For any work anticipated within the San Leandro Creek bank or creek bed, approval from the Army Corps of Engineers and the Alameda County Flood Control District shall be required prior to issuance of grading permits for removal of contaminated soils. • During excavation of contaminated on -site soils, all trucks shall be staged on -site, be dry -decontaminated prior to exiting the site, and have cover tarps in place. A street sweeper shall be used to help remove soil tracked from the site, with appropriate dust control measures instituted during the excavation and fill process. • All remediation work shall be completed to the satisfaction of the n Regional titer Quality and the City's Environmental Services Manager prior to issuance of grading o b lI t result in NOISE `mould the orolec a. Exposure of persons to or generation of noise levels in excess of standards established in the local general plan or noise ordinances, or applicable standards of other agencies? b. Exposure of persons to or generation of excessive groundborne vibration of oundborne noise levels? C. A substantial permanent increase in ambient noise levels in the project vicinity above levels existing without the project? d. A substantial temporary or periodic increase in ambient noise levels in the project vicinity above levels existing without the project? — e. For a project located within an airport land use plan, would the project expose people residing or working in the project area to excessive noise levels? 10 Preda Street Homes - Initial Study Checklist X I I I 2,10 X X I 1I 2,10,. X I I 2,10 X 1 2,13 January 2001