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Mr. Bill Apple, Associate Planner City of Santa Ana, Planning Division March 11, 2008 Page 11 General Capacity Calculations and Level of Service (LOS) Standards Traffic Impact Analyses include the calculation of LOS for each of the study roadway segments, freeway ramp and intersections. The roadway segments LOS will be determined using the methodology presented in the County MPAH. The LOS for signalized intersections at Caltrans ramps will be based on the Highway Capacity Manual (HCM) methodology. The LOS for unsignalized intersections will be based on the HCM methodology. At least, the following analysis scenarios shall be considered. CMP intersections must be analyzed using the specific CMP methodology presented in OCTA CMP Based upon the Circulation and Land use Elements of the City of Santa Ana, the City intersections located outside of Major Development Areas (MDA), considers LOS D as the threshold for an acceptable service level for MDA. Furthermore, the City of Santa Ana considers LOS E as the maximum threshold for acceptable service levels for intersections located within MDA. For locations outside of MDA, if the intersection is expected to operate at an unacceptable level of service (LOS E or F) under base conditions (conditions without the project), improvement and recommendations are requested to achieve acceptable levels of service at the intersections. For locations within MDA, if the intersection is expected to operate at unacceptable/poor levels of service intersections (LOS F) at Santa Ana intersections within MDA) under base conditions (conditions without the project), improvement and recommendations are requested to achieve acceptable levels of service at the intersections. A project is considered to have a significant traffic impact at an intersection if traffic LOS deteriorates to an unacceptable level of service (i.e., LOS E or F at intersections outside of MDA, LOS F within MDA with the addition of projected traffic. Improvements are required for locations that operate at acceptable LOS without the project, but which operate at an unacceptable LOS with the project. For locations that are forecasted to operate worse than the acceptable even without the project, the traffic assessment must include improvements to achieve acceptable LOS per the City of Santa Ana's standards. General capacity nalysis guidelines are: • The City of Santa Ana utilizes the following values in calculating Intersection Capacity Utilizations (ICU's): through lane capacity — 1700 VPHPL; turn lane capacity — 1600 VPHPL; clearance intervals 5%; no defacto for shared lanes.