.STATOF CALIFORNIA PETEWILSON, Governor AIRRESOURCESBOARD 2020L STREET P.O. BOX 2815 SACRAMENTO, CA 95812 January7, 1993 Mr. Daniel W. McGovern 

## RECEIVED Regional Administrator Environmental ProtectionAgency 

## ii131993 75 Hawthorne Street AIr&TxcDMsion San Francisco, California 94105 U.S.EIA,Hegion9 Attention: Mr. David P. Howekamp DearMr. McGovern: Clarification ofPrevious SIP Submittal for the South Coast California is required to submittoyour agency arevision to the California State Implementation Plan (SIP) that includes a ridesharirig programunder Section 182(d)(1)(B). In addition, the statemust submit Transportation Control Measures (TCMs) to offset any growth in emissions fromVehicleMiles Traveled (VMT) or numbers ofvehicle trips under Section 182(d)(1)(A). These requirements applyto areas with a “severe” or “extreme” classification. This submittal addresses the South CoastAir QualityManagement District (AQMD/District). RegulationXV On November 12, 1992, Mr. James M. Lents, Executive Officer ofthe South CoastAQMD transmitted a letterto theAirResources Board (ARB) outlining the actions taken bythe District tomeet the federal requirements. These actions include the submission ofRegulationXV, the District’s ridesharing program, to the Environmental ProtectionAgency (EPA) on February7, 1989. This was deemed completeby EPAon May 5, 1989. An amendment to Regulation XVwas also submitted to EPAonApril 5, 1991, and deemed to constitute a complete SIP submittal in Mayof 1991. Therefore, I amrequesting that the U.S. EPA accept Regulation XV, based upon these two previous submittals, as the ridesharing programfor the South Coast. YourAgencyhas requested supplemental information to the 1989 and 1991 SIP submittals, specifically a baselineAverage Vehicle Occupancy (AVO) of commute trips for 1991. EPA staffhas agreed thatthis informationmaybe supplied afterthe November 15, 1992 deadline, and that provision ofthis information after that datewould not cause a finding ofnon—compliancewith the federal requirements andwould not trigger sanctions. The Districtwill submit this information to theARB byMarch of 1993. Upon approval, ARB will forward this information to EPA. 

# )t Mr. Daniel McGovern —2— Offsetting Growth in VMT and Vehicle Trips In addition to the ridesharing requirement, Section 182(d)(1)(A) requires states to submit revisions to their SIPs that identify and adopt specific TCMs to offset any growth in emissions caused by VMT or numbers of

vehicle trips in areas designated as “severe” or “extreme” for ozone. We believe offsetting TCMs are not necessary in the South Coast District for the following reason: motor vehicle emissions are projected to continuously decrease throughout the planning period in the District (see attachment 1). We expect this trend to continue for the foreseeable future. However, to ensure that is the case, we will revisit the issue in the 1994 SIP submittal. This clarification should fulfill the requirements for a ridesharing program. If you have any questions or would like to discuss this SIP submittal, please contact Ms. Anne Geraghty, Manager of the Transportation Strategies Group, at (916) 322—2745 or Ms. Elizabeth Miller, at (916) 445—6243. Sincerely, Ja es D. Boy E cutive Officer Attachment cc: Mr. David P. Howekamp, EPA Mr. Wally Woo, EPA Mr. Jerry Wamsley, EPA Mr. James M. Lents, SCAQMDC TABLE 2-2 Baseline and Controlled Emissions (tons/day) in the South Coast Air Basin for the August 1987 and June 1987

Episodes. -Hr.,) U’ NOx ROG CO Scenario Mobile Other Total Mobile Other Total Mobile Other Total 1994 Baseline 530.3 532.6 1062.9 420.4 687.1 1107.5 3825.1 736.7 4561.8 1997 Baseline 496.4 505.1 1001.5 357.4 684.8 1042.2 3308.8 771.6 4080.4 2000 Baseline 485.8 504.9 990.7 317.2 691.7 1008.9 2884.0 790.0 3674.0 2010 Baseline 551.8 542.9 1094.7 342.0 724.8 1066.8 2554.4 886.5 3440.9 1994 Controlled 490.5 493.4 983.9 337.7 582.0 919.7 2769.4 722.8 3492.2 1997 Controlled 397.1 386.3 783.4 242.2 529.1 771.3 2062.4 719.3 2781.7 2000 Controlled 345.0 304.2 649.2 197.6 278.4 476.0 1787.4 645.9 2433.3 2010 Controlled 219.8 178.5 398.3 74.5 112.6 187.1 1012.2 596.8 1609.0 c—f

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