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Table 4.4-4: Weaving Impacts Summary j * Existing Conditions -AM Peak Hour Weaving Alternative 1 Alternative 2 Alternative 3 Alternative 4 Section LOS Speed LOS Speed LOS Speed LOS Speed ;•. 1-5 Northbound Between the SR 132 Loop Ramps WeavingrA 55 B 54 6 53 A 55 !' Non-Weaving 61 A 60 A 60 A 61 Impact 4.4-1 Structural Damage to Existing Roadways and Bridges i Koster Road and Blewett Road are currently not designed to withstand repeated use by loaded gravel trucks. The narrow width (18 to 20 feet) and inadequate structural section i make them unsuitable for gravel truck use. Alternative 1: Proposed Project I All quarry traffic would use Koster Road from the project access to Blewett Road. North i of Blewett Road, 90 percent of quarry traffic would use Koster Road. Koster Road would suffer damage from gravel trucks that would result in significant impacts to other users of I the roadway. The Koster Road bridge across the Delta Mendota Canal was also not designed to carry truck traffic and could fail. A small amount of truck traffic on Blewett Road could cause structural damage to the pavement and bridge structures. The impacts to existing roadways and bridges would be significant. Alternative 2: Proposed Project with Alternate Northern Access Road Blewett Road between the proposed project access and Bird Road would carry 85 percent ii of loaded trucks and 35 percent of unloaded trucks for the proposed quarry. Koster Road would carry 10 percent of the loaded trucks and 60 percent of the unloaded quarry trucks. The Blewett Road and Koster Road structural sections would suffer damage from the F heavy truck usage. The bridges on Blewett Road (across the Delta Mendota Canal and 1-5 " t ) I; S could also suffer damage from heavy trucks. The impacts to existing roadways and bridges would be significant. Alternative 3: Proposed Project with Bird Road Access to New Interchange As proposed by Alternative 3 all quarry trucks would use the Vernalis interchange and the section of relocated Bird Road between the interchange and the quarry access. Traffic generated by this alternative would contribute to the wear and normal deterioration of relocated Bird Road, and the newly constructed Vernalis interchange. The impacts to the newly constructed roadways would be significant. None of the County roads, except for ? the relocated section of Bird Road, would carry quarry traffic. i Draft Environmental Impact Report 4-47 ER-96-3