Agmt09 TRA Environmental Sciences, Inc

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1250, 1252, and 1254 Edgewood Road, Redwood City Initial Study/Mitigated Negative Declaration Proposal March 25, 2009 Page 5 This air quality section will describe short-term (construction) impacts, especially the production of dust during site grading at 1250 Edgewood Road, and will contain the BAAQMD Best Management Practices to be applied as mitigation measures to avoid impacts. D. Biological Resources. TRA will completely answer all questions in this section. We will provide a description of the environmental setting, complete with all plant species onsite and a list of animal species that can be expected to use the five lot annexation area. We incorporate relevant data from other CEQA documents that we have prepared for other projects that have the same environmental setting (i.e., adjacent to a creek). The findings from the arborist's report of the tree inventory, tree protection measures, etc. at 1250 Edgewood Road will be incorporated as necessary into this section, and a determination of the project's conformance to the City's Tree Preservation Ordinance will be included. Since the five lot annexation areas is completely surrounded by residential development, a search of imperiled species as listed in the California Natural Diversity Database (CNDDB) is not part of this scope. E. Cultural Resources. We will describe the environmental setting in terms of both historic and archaeological resources. Of special importance is the proximity of 1250 Edgewood Road to Cordilleras Creek, although since the site is currently developed, it is unclear at this time if the proposed grading plan affect buried cultural or archaeological resources. We will make findings and present mitigation measures as appropriate. F. Geology and Soils. TRA will analyze geological and soils impacts using information contained in the geotechnical report, and the grading, drainage and erosion control plan as part of the Tentative Parcel Map for 1250 Edgewood Road, and the City's General Plan as applicable. We propose to use the professional geotechnical consulting services of the Bay Area Geotechnical Group (BAGG) to peer review this geotechnical report. According to BAGG, nearby State Seismic Hazard Maps do not include the property, but the nearby mapped State Liquefaction Zone will likely be extended west to cover the northern portion of the property (near Cordilleras Creek) once the State finishes mapping in this vicinity. All findings and recommendations from both the geotechnical report and geotechnical peer review document, especially concerning liquefaction, will be incorporated into this section of the IS. G. Hazards and Hazardous Materials. TRA will answer Checklist questions with the discussion to be based on existing available information. H. HydrologylW ater Quality. TRA will provide an impact discussion that addresses impacts to water quality from short-term construction activities and long-term project usage. The section will include a description of the project's effects on adjacent Cordilleras Creek, which is up to about 20 feet lower in grade than the existing rough grade elevation at Parcell as shown in the Preliminary Design Map of 1250 Edgewood Road. This section of the Checklist will note if trees are to be removed within the creek corridor, and discuss impacts and mitigations to ensure bank stability as appropriate. TRA ENVIRONMENTAL SCIENCES, INC.