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F! I LSA ASSOCIATES.I NC. INITIAL STUDY/ENVIRONMENTAL DOCUMENTATION JULY 2000 STOCKTON METROPOLITAN AIRPORT SPECIAL PURPOSE PLAN t : Would theP roject: a) Cause an increase in traffic which is substantial in relation to the existing ki traffic load and capacity of the street system (i.e.,result in a substantial increase in either the number of vehicle trips,the volume to capacity ratio on roads,or congestion at intersections)? I Potentially significant unless mitigated. Under current conditions,one intersection (Sperryl1-5 NB ramps)operates at a level of service that exceeds the Ievel of service (LOS)standard. Two intersections(Arch Road/East Frontage Road and Arch- Airport Road/SR-99 interchange)have volume-to-capacity ratios that exceed 1.0. Implementation of the proposed SPP will generate a total of 7,789 peak PM trips, . and a total of 61,860 average daily trips. Nearly all of these trips are new trips when l compared to existing conditions,as the current airport uses generate very few trips. It would be expected that, by year 2015, if improvements to the existing roadway network do not occur, implementation of the SPP would seriously overburden the roadway system and intersection capacity. Therefore, mitigation in the form of roadway and intersection improvements would be necessary to mitigate the effects of the SPP on the future roadway system (see mitigation below). The analysis indicates that Arch-Airport Road would need to be eight(8) lanes between Qantas Lane and Airport Way, in order to accommodate 2015 Project PM peak hour traffic volumes. The SR-99/Qantas Lane flyover ramps would also be required by 2010 to provide additional capacity. Airport Way would need to be six (6) lanes between Stimson Street intersection and the Arch-Airport Road F' intersection. li The proposed SPP generates approximately 389 more PM weekday trips than the 2015 Airport Master Plan alternative. Conversely,the SPP generates 187 fewer average daily trips than the Master Plan project. These differences are considered insignificant, essentially resulting in no overall change in traffic generation. b) Exceed,either individually or cumulatively,a level of service standard established by the county congestion management agency for designated roads or highways? F" Potentially significant unless mitigated. The traffic analysis considers cumulative growth in the baseline modeling. Therefore,the analysis considers area growth for 2015 conditions with the SPP traffic added to the analysis. Out of the fifteen study intersections, nine would be impacted by the SPP based upon the San Joaquin County and the City of Stockton LOS standards. Some of the intersections are operating at LOS "F"under the 2015 no-project condition and would remain at LOS "F"with the SPP. F The analysis also indicates that all roadway and freeway segments would experience acceptable LOS "D"or better conditions under the year 2015 scenario that includes the SPP. F 7/20100(P:1S]C0301Environmentallinitial study.wpd} 45 I.