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75C - PH - BRISTOL EIR FROM WARNER TO ST. ANDREW
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75C - PH - BRISTOL EIR FROM WARNER TO ST. ANDREW
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Last modified
4/8/2015 3:32:45 PM
Creation date
4/2/2015 4:21:45 PM
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City Clerk
Doc Type
Agenda Packet
Agency
Public Works
Item #
75C
Date
4/7/2015
Destruction Year
2020
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pollutants are a large -scale phenomenon and should be analyzed on a regional <br />basis rather than a local one. <br />The "worst case" assumptions made in the Cadne 3 modeling process included: <br />wind speed of 1 meter per second, wind direction parallel to the road, peak <br />hour traffic volumes, and atmospheric stability class of F (most stable) for 1- <br />hour averages and class D for 8 -hour averages. The results appear in Table 15 <br />and represent "worst case" conditions. Actual levels would probably be less. <br />Three scenarios were analyzed based upon traffic volumes for 1987 and for <br />future year 2006 conditions both with and without the project. <br />As shown in Table 15, the future design year carbon monoxide concentrations <br />adjacent to the intersections most affected by the project will not equal or <br />exceed the 35 ppm one -hour federal standard with or without the roadway <br />widening proposed. Additionally, the 20 ppm one -hour state standard should <br />not be exceeded after completion of the proposed project. Conversely, state <br />one -hour standard exceedances may occur in the future design year under the <br />"No- Build" condition at the intersections analyzed. <br />Ambient CO levels in the design year (9.5 ppm) are projected to exceed the <br />eight -hour state and federal standards (9.0 ppm) in the project vicinity. <br />Carbon Monoxide (CO) contributions at the intersections analyzed are also <br />projected to exceed the eight -hour standards, regardless of the alternative. <br />The number of days exceeding applicable CO standards within the project <br />area, however, are expected to be reduced, under the 'build" alternatives. <br />Current CO concentrations without the project exceed the state one -hour and <br />eight -hour standards and the federal eight -hour standards. <br />To facilitate comparison between scenarios, Table 15 shows the projected CO <br />concentrations directly attributable to the roadway without adding background <br />(or ambient) CO levels. The ambient CO concentrations shown in Table 15 <br />should be added to the levels generated by the traffic at the intersections <br />analyzed to reflect the expected concentrations at various distances from the <br />intersections. <br />The carbon monoxide levels at sensitive receptor locations nearest the <br />intersections analyzed are shown in Table 15. With the 'build" alternative, <br />one -hour CO levels will decrease by 0.8 to 2.8 ppm. Under eight -hour <br />conditions, CO levels will decrease by 0.3 to 1.0 ppm. <br />Figure 18 illustrates the four intersections analyzed, the closest residential lots, <br />and the closest sensitive receptor location. As shown therein, the closest <br />residential land uses to the intersection of Bristol Street and Memory Lane are <br />three single - family dwellings (SFD) and a multi - family apartment complex. <br />The first SFD lies 200 feet east of the Bristol Street centerline and the <br />IV -13 <br />75C -148 <br />
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