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3.2 Transportation and Traffic F 5 - practice for traffic analyses,midweek(Tuesday through Thursday)traffic volumes were used for the analysis because those days of the week best represent typical traffic conditions. The Project would extend hours of operation at the Quarry and allow Quarry-generated traffic on area roads between 9:00 PM and 5:00 AM.Because the highest traffic volumes on the affected roads during the eight-hour nighttime period currently occur between 9:00 and 10:00 P.M, and the proposed Project would generate the most nighttime vehicle trips during that'same hour,the focus of the analysis was that 9:00 to 10:00 PM period. Traffic operating conditions are evaluated using methodologies in the 2000 Highway Capacity 4 Manual(HCM)(Transportation Research Board, 2000). The HCM defines Level of Service (LOS)as a quantitative measure which describes operational conditions within a traffic stream, �. generally in terms of such factors as speed and travel time, freedom to maneuver,traffic interruptions, comfort and convenience, and safety. There are six levels of service, LOS A �i through LOS F,which relate to traffic congestion from best to worst, respectively. The Highway Capacity Software was used as the analysis too] in this study,using the HCM analysis procedures, and various roadway characteristics(e.g., traffic volumes, lane geometry,heavy ` vehicle percentage). w Table 3.2-1 summarizes the existing traffic volumes and LOS conditions on the study roadway segments. As shown,during the peak nighttime traffic period between 9.00 and 10:00 PM, all of the study segments are currently operating at acceptable service levels(LOS C or better). Detailed traffic level of service calculation sheets is located in Appendix C. TABLE 3.2-1 EXISTING TRAFFIC VOLUMES ON AREA ROADWAYS a Total Average Hourly Maximum Hourly Level of Daily Traffic Volume` Traffic Volume Service Roadway Segment Traffic a (9:00 PM—5:00 AM) (9:00 PM—10:00 PM) (LOS)' East River Road :n 1 West of Quarry Access Road 365 46 95 B East of Quarry Access Road 336 42 94 B McHenry Avenue .u :....... _ .:: ..:: _ North of East River Road 586 73 222 B South of East River Road 827 103 299 C Santa Fe Road' + South of East River Road 607 76 157 B a. All traffic count'data represents bi-directional volumes on midweek days(Tuesday-Thursday)along each roadway. 1� b. Average daily traffic over three days(Tuesday-Thursday)of continuous counting. c. Average traffic volume per hour between 9:00 PM and 5:00 AM. t d. Maximum hourly traffic represents highest traffic hour observed along the roadway(9:00 to 10:00 PM). +r` e. LOS based on the maximum hourly traffic(9:00 to 10:00 PM). SOURCES:Southland Car Counters(2008 Counts);Marks Traffic Data(2011 Counts);ESA(LOS Calculations). f . ay� �oC r Munn&Perkins Quarry Excavation Permit 3.2-3 ESA 1211086. Draft EIR April 2011 1 �