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5.12 TRAFFIC AND TRANSPORTATION <br /> The CEC staff performed thermal plume modeling for the Russell City Energy Center <br /> (RCEC) and Blythe II (BEP) combined cycle gas turbine stacks. Both projects proposed to use <br /> Frame 7 gas turbines,and the thermal plume modeling for both plants produced similar <br /> results. The gas turbine/HRSG stack parameters for the RCEC, BEP and LEC projects are <br /> compared in Table 5.12-9. <br /> TABLE 5.12-9 <br /> Comparison of Gas Turbine/HRSG Stack Parameters <br /> RCEC' BEPa LECb <br /> Parameter 38°F 59°F 38°F 59°F 24°F 61°F <br /> Stack Ht,ft 145 130 150 <br /> Stack Diam,ft 18 16.5 19 <br /> Stack Velocity, ft/s 72.1 74.0 84.7 85.0 61.5 58.5 <br /> Exhaust Temp, °F 193 194 216 218 183 187 <br /> 'From RCEC FSA Section 4.10, June 2007. <br /> bFrom Air Quality Appendix 5.1 B. <br /> The CEC staff calculated plume velocities for the RCEC and BEP plumes under the two <br /> temperature conditions and concluded: <br /> "For the [RCEC] gas turbine HRSG cases the heights at which the plume velocity <br /> drops below 4.3 m/s are calculated to be approximately 995 feet and 880 feet, <br /> respectively for the 38°F and 59°F operating cases... For the [BEP] gas turbine/HRSG <br /> cases the heights at which the plume velocity drops below 4.3 m/s are calculated to <br /> be approximately 1,030 feet and 950 feet,respectively,for the 38°F and 59°F <br /> operating cases."7 <br /> Because the LEC has lower velocities and exhaust temperatures than RCEC,the LEC plume <br /> velocity would be expected to drop below 4.3 m/s at altitudes lower than the 995 foot and <br /> 880 foot altitudes calculated for RCEC. The LEC HRSG plume velocity is expected to drop <br /> below 4.3 m/s before reaching the standard traffic pattern altitude of between 800 and <br /> 1.000 feet and therefore would be unlikely to cause significant turbulence. <br /> A similar analysis was performed for the RCEC and BEC cooling tower plumes. The cooling <br /> tower stack parameters for the RCEC,BEP and LEC projects are compared in Table 5.12-10. <br /> 7 CEC, Final Staff Assessment for the Russell City Energy Center,Traffic and Transportation,p.4.10-29,June 2007. <br /> SAC/371322/082380003(LEC_5.12_TRAFFIC_AND_TRANSPORTATION.DOC) 5.12-29 <br />