Laserfiche WebLink
Table 9 <br />Current Exterior CNEL Exposure <br />Adjacent to Bristol Street <br />Roadway Link <br />Current <br />CNEL at <br />Dist. to Contour (ft) <br />(Speed) <br />A-D.T.1 <br />75 ft.' <br />70 dBA <br />65 dBA <br />60 dBA <br />Bristol Street (35, 40 mph) <br />-NCO Warner Avenue <br />33,400 <br />70 <br />78 <br />232 <br />729 <br />-N/O Edinger Avenue <br />31,900 <br />69 <br />57 <br />161 <br />502 <br />-NIO McFadden Avenue <br />35,700 <br />69 <br />62 <br />179 <br />562 <br />-NIO Bishop Street <br />40,000 <br />70 <br />68 <br />201 <br />630 <br />-NIO First Street <br />35,500 <br />69 <br />62 <br />178 <br />559 <br />-NIO Santa Ana Boulevard <br />35,500 <br />69 <br />62 <br />178 <br />559 <br />-NIO Fifth Street <br />36,700 <br />69 <br />61 <br />183 <br />577 <br />-NIO Civic Center Drive <br />37,300 <br />69 <br />62 <br />186 <br />587 <br />-NIO Washington Street <br />39,400 <br />70 <br />68 <br />198 <br />620 <br />-NIO Seventeenth Street <br />42,800 <br />71 <br />95 <br />296 <br />934 <br />NIO Santa Clara Avenue <br />48.600 <br />72 <br />110 <br />336 <br />1,060 <br />` A.D.T. means 1987 average daily two -way traffic volume. <br />All distances axe measured from the centerline. All contours ignore localized <br />shielding effects. <br />Source: Endo Engineering <br />Tables 9 and 10 provide the predicted current CNEL and L4--q levels <br />adjacent to Bristol Street in the project area. Assuming a noise <br />reduction with a distance factor of 3.0 dBA with each doubling, and <br />assuming no adjustment for local attenuation (houses, buildings, noise <br />barriers, etc.), the distance to various noise contours used for land use <br />compatibility purposes have also been determined and shown. <br />The FHWA RD- 707 -108 noise model predicts noise levels based upon <br />average traffic volumes, speeds, roadway width, truck mix, and distance <br />to observers. Noise measurements reflect the actual conditions on one <br />particular day at the location monitored. <br />Noise measurements can be strongly affected by weather, placement of <br />traffic control devices, design and condition of the roadway, and <br />topography. A comparison of the noise model predictions and the <br />noise measurements can provide additional information about the affect <br />of localized conditions on traffic noise. <br />111 -25 <br />