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· Review recent environmental noise and vibration studies for applicable data that could be used to describe current noise and vibration exposure in the City, particularly the Downtown Precise Plan and the Main Street Plan; . Develop a noise monitoring program in close coordination with City staff. Noise sources are known to include U.S. Highway 101, EI Camino Real and other major roadways, Caltrain, and stationary industrial sources. Aircraft noise will also be quantified. Noise measurement locations will be selected based on consultation with City staff to quantify noise levels along major thoroughfares, in developing areas, or in other areas that have been problematic in the past. Five to ten long-term (minimum of .24 hours) and 10 to 15 short-term (10- to 15-minutes) noise measurernentsare anticipated. A data report including a discussion of noise and vibration levels throughout the City will be presented upon completion of the monitoring surveys. The results of monitoring at each location will be depicted graphically to show the daily trend in noise levels at each measurement site. A summary of all noise .and vibration data will be tabulated; · Calculate existing noise contours based upon the data collected during the existing conditions monitoring survey and traffic data provided by the City. The contours will be based on existing data, field measurements, and noise modeling results. 1& R utilizes several traffic noise models developed by Caltrans and FHWA. These traffic noise models will be used to develop noise contour information for highways and freeways and primary arterials and major collector streets. Aircraft noise data would be obtained from the current ALUC Plan. I & R also utilizes SoundPLAN to model and graphically display transportation-related noise sources and stationary noise sources. I&R will prepare an existing noise contour map on base maps supplied to us by the City. I & R prefers to prepare the contours using Sound PLAN if base map files that include roadway and railroad centerlines are available. SoundPLAN files can be directly imported into a GIS database. I & R will prepare the noise contour map in terms of Ldn in increments of 5 decibels down to 60 dBA Ldn. The existing noise contour map will be prepared and submitted with the existing conditions baseline report; and · Prepare a Noise and Vibration Baseline Conditions Report. The Report will include descriptions of the major transportation sources and stationary noise sources in Redwood City, summarize current noise policies set forth in the existing General Plan, other noise regulations set forth in the Zoning Ordinance and Municipal Code, describe the noise monitoring survey results, present tabularized noise exposure contours and the existing conditions noise contour map. The Report will also summarize current information on ground vibration thresholds, summarize the existing vibration environment, discuss the currently planned changes to the Caltrain and rail systems, and the "future baseline" conditions expected when these currently planned changes are implemented. 5.5 Draft Safety Report Geology and Soils -Redwood City is located within a seismiCally active area of coastal northern California, with areas underlain by artificial fill that are particularly susceptible to .seismic groundshaking. A significant seismic event on one of the several active faults within the region (which will almost certainly occur at some time over the lifetime of the General Plan) may result in direct (e.g., shaking-related damage to buildings and other improvements) andJorindirect impacts (e.g., earthquake induced settlements) within the City. Faults of particular interest include: San Andreas, Hayward, and the San Gregorio faults. Regional issUes related to the geotechnical suitability of soils in the City will also be evaluated. Our team includes staff from BASELINE SCOPE OF SERVICES Redwood City General Plan January 11,2008 Page 15