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Existing noise levels on the southern portion of the College Park site are also influenced by traffic from I-205. <br /> Noise levels near I-205 were estimated using the FHWA Traffic Noise Prediction Model (FHWA-RD-77-108) <br /> based on existing traffic conditions. As indicated in Table 4.13-3, the 70, 65, and 60 dBA CNEL noise contours <br /> from the freeway extend from the nearest travel lane of I-205 for a distance of approximately 473, 1,016, and <br /> 2,187 feet, respectively. Assuming 50 feet between the outer edge of the nearest travel lane to the project site <br /> boundary(i.e., Caltrans right-of-way), the 70, 65 and 60 dBA CNEL noise contours from the freeway extend into <br /> the project site by approximately 423, 966, and 2,137 feet, respectively. The extent of these contours is also <br /> shown in Figure 4.13-2. — <br /> Table 4.13-2 <br /> Existing Traffic Noise Levels <br /> Existing Noise Level(dBA <br /> Roadway Segments Ld JCNEL)at 50 Feet from <br /> Centerline of Near Travel Lane <br /> Byron Road between Mountain House Road and Mountain House Parkway 68.1 <br /> Byron Road between Mountain House Parkway and Hansen Road 67.8 <br /> Mountain House Parkway between Byron Road and Main Street 63.6 — <br /> Mountain House Parkway between Mascon Boulevard and Grant Line Road 63.9 <br /> Mountain House Parkway between Von Sosten Road and I-205 63.1 <br /> Grant Line Road between Mountain House Road and proposed Great Valley Parkway 68.2 <br /> Grant Line Road between road just west of DeAnza Boulevard and Mountain House Parkway 64.1 <br /> Grant Line Road(West)between Mountain House Parkway and Hansen Road 64.2 <br /> Von Sosten Road between Mountain House Parkway and Hansen Road 59.2 <br /> Byron Road between Mountain House Road and Mountain House Parkway 68.1 — <br /> Notes:Traffic noise levels were modeled using the FHWA Traffic Noise Prediction Model(FHWA-RD-77-108),based on traffic information <br /> obtained from the data generated by TJKM Transportation Consultants used to prepare the traffic section for this EIR and assuming no <br /> natural or human-made shielding(e.g.,vegetation,berths,walls,buildings).Refer to modeling output on file at the San Joaquin County -- <br /> Community Development Department(SJCCDD)for input assumptions and output results. <br /> Source:Data compiled by EDAW in 2004 <br /> Table 4.13-3 <br /> Existing Freeway Traffic Noise Levels <br /> Noise Level(dBA CNEL) — <br /> Noise Level(CNEL)at 50 Distance of CNEL Contour from Near <br /> Feet from Near Travel Travel Lane Centerline(feet) <br /> Lane Centerline 60 dBA 65 dBA 70 dBA <br /> 1-205 between 1-580 Split and Mountain House Parkway 81,46 2,187 1,016 473 <br /> Interchange — <br /> Notes:Traffic noise levels were modeled using the FHWA Traffic Noise Prediction Model(FHWA-RD-77-108),based on traffic information <br /> obtained from the data generated by TJKM Transportation Consultants used to prepare the traffic section for this EIR and assuming no <br /> natural or human-made shielding between the roadway and receptor.Refer to noise modeling output,available for review at the SJCCDD. <br /> for modeling input assumptions and output results.As a result,the noise contour distances should be considered as representative bands — <br /> of similar noise exposure,rather than absolute distances of demarcation. <br /> Source:Data compiled by EDAW in 2004 <br /> EDAW College Park at Mountain House Specific Plan III Draft EIR <br /> Noise 4.13-6 San Joaquin County <br />