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6W Draft Supplemental Environmental Impact Report Page IV.B-4 Forward Inc.Landfill 2014 Expansion Project i • intersection lane configurations, • design and type of traffic control, Lspeed and travel time, • traffic interruptions, • freedom to maneuver, and • driving comfort and convenience. L Levels of service may be expressed qualitatively with letters "A" through"F" from best to worst,which cover the entire range of traffic operations that might occur. Levels of service A through D generally represent traffic volumes at less than roadway capacity, while LOS E represents traffic volumes at or near roadway capacity, and LOS F represents over-capacity or forced flow conditions. San Joaquin County level of service (LOS)policy states that intersections shall operate at an overall LOS D or better on minor arterials and roadways of higher classification, and at LOS C on all other roads.Arch Road is designated a minor arterial, so LOS D applies as the standard of significance. LOS C applies to other study intersections along Austin Road. County and California Department of Transportation (Caltrans)LOS ;., policies apply to the remaining study intersections and define acceptable operations as an overall LOS D or better. i County policies also includes guidelines for determining whether added traffic from a proposed development is to be considered a significant impact. • If the LOS for this condition exceeds the County's LOS standards, then mitigation L measures that would improve the LOS to an acceptable level must be identified. LOS must be expressed in terms of delay in seconds for intersections. • If the LOS for conditions at a given location is already at an unacceptable LOS, then mitigation measures that would return the v/c ratio (volume/capacity) to the "existing" level must be identified. Different types of analyses are used for signalized and unsignalized intersections. The methods used to analyze both signalized and unsignalized intersections are described below. The study methodology was selected by Republic/ITS based on input from both the City of Stockton and San Joaquin County staff. Generally, this study follows County Traffic Study Guidelines (San +•• Joaquin County,2008),but because the project is within the City of Stockton's sphere of influence, a 2035 horizon year for cumulative analysis was used per City guidelines. Tables IV.B-1 to IV.B-3 provide a brief description of LOS for each category. L Table IV.B-1 Level of Service Descriptions Signalized Intersections Level of Service Average Control Delay i (seconds/vehicle) A s10 B >10-20 C >20-35 D >35-55 E >55-80 F >80 `W Source:Highway Capacity Manual, Chapter 16 (Transportation Research Board, 2000) 6.