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III. Environmental Setting, Impacts, and Mitigations D. Transportation and Circulation The majority of current vehicles traveling to and from the project site are refuse trucks(about 100 trucks per day,with about 14 trucks per hour spread evenly throughout the two-hour morning peak period,7:00 a.m.to 9:00 a.m.)(Reisler, 1993). Each truck represents two one-way trips(inbound full and outbound empty)and therefore,there are currently about 200 vehicle trip- ends (vte)per day,of which about 28 vte occur during the a.m.peak hour. The majority of truck traffic travels between the landfill and Ci of Stockton,to the northwest,via Mariposa Road. ty There are five full-time employees on-site;two part-time employees work when needed,during peak activity periods. The estimated number of existing non-peak-activity non-truck trips traveling to and from the landfill is about 16 daily vte and about two a.m.peak-hour vte.t The total number of vehicle trips currently generated by the landfill is about 216 daily We and about 30 a.m. peak-hour vte. Existing Level of Service Conditions The concepts of capacity and level of service are central to the analysis of all intersections, ' although their meanings and the criteria for defining levels of service are different for signalized and unsignalized intersections. Capacities are typically calculated on a peak hour basis and expressed in vehicles per hour(VPH)or passenger car equivalents per hour(PCPH). Level of service is the relationship between the intersection capacity and the vehicle load. Six levels of service have been established,from LOS A to LOS F. According to generally accepted practice (and City of Stockton policy),LOS A,B,and C reflect acceptable conditions,LOS D reflects the existence of delays within a generally tolerable range,while LOS E and F indicate delays increasing into unacceptable conditions. A more detailed description of the level of service analysis methodology and the criteria used to define levels of service at unsignalized intersections are provided in Appendix C. Using intersection turning movement traffic volumes collected in July 1992,intersection levels of service(LOS)were determined for the unsignalized intersections of Austin Road at Mariposa, Arch and French Camp Roads through and analysis methodology provided in the Highway Non-truck trip generation is based on trip rates of 3.02 daily vte per employee and 0.44 a.m. peak-hour vte per employee for Light Industrial uses,from survey results published in the Institute of Transportation Engineers'Trip Generation,Fifth Edition, 1991. The daily trips beyond the two vte for each employee commuting to and from the site in their own vehicle account for non-employee - travel(i.e.,visitor and executive trips). All of the a.m.peak-hour vte would be associated with non-employee travel because landfill employees would arrive at the site before the a.m.peak-period to begin the workday by 6:00 a.m. M.D.3