ࡱ> KMJq &bjbjt+t+ %8AA"]~~~~~~~8"6, :nnL  $  6 ~ ~~n@~~m ,,~~~~ vp :# @~~m b Jac Appendix 8.1C Protocol for Increments Analysis Overview of Requirements for Increments Analysis The federal Prevention of Significant Deterioration (PSD) program is intended to ensure that economic growth in areas with good air quality occurs without causing the deterioration of that air quality to unhealthful levels. The PSD program contains a number of requirements that apply to new or modified sources of air pollution that are located in clean air areas. In the Bay Area, the Bay Area Air Quality Management District (BAAQMD) has been delegated authority by the USEPA to administer the PSD program for NO2, SO2 and PM10, the pollutants for which federal ambient standards are currently being attained. These PSD program requirements, applied on a pollutant-specific basis, include conducting an increments analysis to demonstrate that no increments will be exceeded as a result of the proposed new or modified source. Increments are the maximum increases in concentration that are allowed to occur above baseline concentrations for each pollutant for which an increment has been established. Currently, increments have been established for NO2, SO2 and PM10. These allowable increments are shown in the table below. Class II IncrementsPollutant/Averaging TimeAllowable Class Increments (g/m3)NO2 Annual 25SO2 3-Hour 24-Hour Annual 512 91 20PM10 24-Hour Annual 30 17 The baseline concentrations are defined for each pollutant and averaging time, and are the ambient concentrations of each pollutant existing at the time that the first complete PSD application affecting the area is submitted. Federal regulations establish the dates after which major and minor source impacts on increment consumption need to be considered in an increments analysis, as follows: Major source baseline date: The date after which actual emissions associated with modifications at a major stationary source affect the available increment. Trigger date: The date after which the minor source baseline date may be established. Minor source baseline date: The earliest date after the trigger date on which a complete PSD application is received by the reviewing agency. After this date, actual emission changes (including increases in throughput or production that do not require permit changes) from all sources (major and minor stationary sources, area sources and mobile sources) affect the available increment. BAAQMD regulations require that before an Authority to Construct can be issued for a facility projecting significant increases in NO2, SO2 and PM10, the applicant must perform an increments analysis to demonstrate that the project will not cause an exceedance of the applicable increment. The ambient impacts from MEC for NO2, SO2 and annual PM10 have been shown to be below significance levels; therefore, increments analyses are not required for these pollutants and averaging periods. However, the 24-hour ambient PM10 impacts were shown to be 5.3 g/m3, slightly above the 5 g/m3 significant impact threshold. Therefore, an increments analysis is required for this pollutant and averaging period. For PM10 in the BAAQMD, the baseline and trigger dates are as follows: PM10Major Source Baseline DateJanuary 6, 1975Trigger DateAugust 7, 1977Minor Source Baseline Dateato be determinedaFor PM10, baseline dates are established on a county-specific basis; therefore, the baseline date will reflect the date of submittal of a complete PSD application for TSP in Santa Clara County. Therefore, the ambient impact of all changes in PM10 emissions since January6,1975 (for major modifications to major sources) and February 8, 1985 (for all sources) that affect the applicable impact area must be considered in the PM10 increments analysis. Methodology Establishing the Impact Area- The first step in the increments analysis is the establishment of the impact area for each pollutant and averaging period. The impact area includes the area where the emissions from the new source will cause a significant ambient impact. As indicated above, the significant ambient impact level for 24-hour PM10 is defined in BAAQMD regulations as 5 g/m3. The impact area is a circular area with a radius extending from the source to the most distant point where modeling indicates that the ambient impact will be significant. As described in the air quality modeling analyses contained in Section 8.1 of the AFC, PM10 emissions from MEC were modeled using the appropriate 24-hour emission rates, the ISCST3 model and the IBM 1993 meteorological data set. Based on these modeling analyses, a region of approximately 2 km in radius surrounding the project site was identified as the area in which MEC could have a significant air quality impact on ambient PM10 levels. Identifying Sources Affecting the Impact Area Once the impact area is established, sources consuming increment within the impact area must be identified and emission inventories developed for those sources. The sources include not only those located within the impact area, but also those located outside the impact area whose emissions could contribute to ambient impacts there. These inventories must account for the change in emissions between the pollutant-specific baseline date and the date of the permit application for the new source or modification. Based on these inventories, the changes in emissions are modeled to determine the amount of increment consumed for each pollutant. In order to ensure that other emission sources that might have significant impacts on the PM10 impact area in conjunction with MEC are identified, we will request from District staff a list of facilities that meet the following criteria: Major PM10 Sources: All sources within 50 kilometers of the PM10 impact area (52 km of the project) that have had significant permitted increases in PM10 (greater than 25 tons per year) since the PM10 major source baseline date (January 6, 1975). Minor PM10 Sources: All sources within 20 kilometers of the PM10 impact area (22 km of the project) that have had any permitted increases in TSP since the TSP minor source baseline date. Because the increments analysis is intended to evaluate changes in ambient impacts since the baseline date due to increment-consuming sources, the analysis should compare impacts from emissions during the appropriate baseline period (two years prior to the baseline date) and from current emissions. However, the District staff indicates that actual PM10 emissions data are not available from the Districts inventory system for the appropriate baseline periods. Only the most current year of actual emissions data are available. Therefore, it was not possible to determine the changes in actual PM10 emissions from the identified point sources. Based on consultations with District staff, it has been suggested that permitted changes in PM10 emissions from the identified point sources be modeled instead. In addition to point sources, and based on recent draft USEPA guidelines, all area and mobile sources affecting increment are to be included in the increments analysis. We will also request a gridded inventory of mobile and area source PM10 emissions changes since the appropriate minor source baseline dates for use in modeling increment consumption from these sources. Emissions changes are allocated to 5 km square grid cells in these inventories. Data Used in the Increments Analysis Stack Parameters for PM10 Sources For the permitted changes in PM10 emissions, we anticipate that the computer printout will provide no stack data, especially when the emissions are fugitive in nature. The following default stack parameters will be used for sources identified as fugitive on the computer printout: Release height: 1 meter Temperature: ambient (70EF) Stack cross-sectional area: 1 ft2 Flow rate: 3000 ACFM Modeling Area and Mobile Source Emissions As discussed above, we expect to obtain from the District staff data on the change in PM10 emissions between the appropriate baseline date and the most recent available inventory for use in modeling increment consumption by area and mobile sources. These data will be provided for 5 km by 5 km grid cells for the entire District. Gridded emission data for the grid cells that overlap the impact areas will used in modeling increment consumption by these sources. The ISCST3 model and the 1993 IBM meteorological data will be used for modeling all increment-consuming sources. 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The PSD program contains a number of requirementsf6.-$47.32756,-57,3,'76,80G7$23$.Q)26-5'.67P3,$2$+47$,Q,6'..2 ^that apply to new or modified sources of air pollution that are located in clean air areas. In6..77326+M2$Q28,8'27$),'1.$727266-.$,2)-,86),-6.$.$,.'6.\.}2 \Lthe Bay Area, the Bay Area Air Quality Management District (BAAQMD) has been6,8.3H$,.6,8.3H$,.H$H7.3W-6.3,Q+6G&$)8GHHWF6-'3,+6.-.s2 Edelegated authority by the USEPA to administer the PSD program for NO8,,3.,8.762$3335,H087H2.8P5',$5,80F7$23$.Q2$LH.@Book Antiquaw*wgw -. 2 2.-.2 , SO0H.-h. 2 h2.-.2  and PM.688W.-.2 10.-. 2 ,0.@.2 @Zthe pollutants for which federal ambient standards are currently being attained. These PSD6,727-6'2$L6(6,8,$..P3+6'-68.$8'.$,)7$$,632,53..5,876,',80G..2 Rprogram requirements, applied on a pollutant-specific basis, include conducting an7$23$.Q$,47$,Q,6'.77,816.727.6'7,()3.&'6(78,)2687)62.6.#.2 #Yincrements analysis to demonstrate that no increments will be exceeded as a result of theD6)$,Q+6'-6-3''27,Q26'$.,5.625)$,Q,6'L3,,/),,8,8.&.$,'726,..;2  proposed new or modified source.7$272',86,M2$Q28,8'27$),.J .2 J UIncrements are the maximum increases in concentration that are allowed to occur above6)$,Q+6'.$,6,Q./Q7Q5)$,.','6)16)+6$.266..$,.1M,822()7$.324,. .2 Wbaseline concentrations for each pollutant for which an increment has been established.3.',6,)16)+6$.26'2$,.(6727-62$L6)5-66)$,Q+66.'2,,6+'.3&6,8.-. .V2 . 2Currently, increments have been established for NOA7$$,636)$,Q+6'6.4,3+,6+'.3'5,82$LH.-V / . 2 V / 20.-. L .2 . L , SO0H.-V . 2 V 20.-.  .2 .   and PM.688W.-V g .2 V g 10.-. .%2 . . These allowable76,',.2M-3,. .G2 (increments are shown in the table below.6)$,Q+6'.$,'61M666,.3,3,1M.@"Arial2 !w*wgw2 -@"Arial !w*wgw - .(2 Class II Increments6***.*)C*.*.0@ Arial !w*wgw - 2  -- !" -  ./2 Pollutant/Averaging Time2..*.6)**.-..B*.- .;2  f  Allowable Class Increments (g/m6.:*.*6)**-**C).*+.C.@"Arial &!w*wgw & -  t. 2  t f  3.- . 2  f  ).@"Arial !w*wgw - 2 .2 2 NO6:.@"Arial !w*wgw - L -. 2 L -2.-  ..2 .Annual2****.  .2  25**.- ! - - ! - - !@ - - !.2 !SO2:.- ;). 2 ;)2O.- w..2 w.3-Hour*6**...2 .24-Hour**6**.$..2 $.Annual2****.w .2 w 512u***. .2  91**.$ .2 $ 20**.- .2 PM2>.- -.2 -10.- e..2 .24-Hour**6**.j..2 j.Annual2****. .2  30**.j .2 j 17**.- !- - ! - - !@ - -.2 ZThe baseline concentrations are defined for each pollutant and averaging time, and are the86,3.'+6,)16)+6$.16'.$,8+6,82$,-)6717-6-68.4,$.363Q,-68.$,6,..2 Yambient concentrations of each pollutant existing at the time that the first complete PSDe.Q3+6)16)+6$.16'2,.(6727-6,/'63-6,Q,6.6,$')2Q7,,80G.s.2 sZapplication affecting the area is submitted. Federal regulations establish the dates after.77).16-+)636,.$,.''73Q,83,8,$.$,37.26','.2&65,8.,'-,$..2 Vwhich major and minor source impacts on increment consumption need to be considered inM5)5Q.2$-68Q62$'27$),Q7-)'166)$,Q+6)16'7Q7166+,823,)26&8,$,86.W.@2 W#an increments analysis, as follows:e.66)$,Q+6'-6.2''.&22M'. .2 QMajor source baseline date: The date after which actual emissions associated witheW.2$'27$),3-',6,8.,86,8.,.,$L6(6.)7-,Q&'25'.''2(.,8M6.}.z2 }Jmodifications at a major stationary source affect the available increment.Q28(.16'..Q.2$'-25.$3'27$),.,)5,-4..3,5)$,Q,6.2.w2 2HTrigger date: The date after which the minor source baseline date may be8$33,$8.,86,8.+.,$M5(65,Q62$'27$),3.'+6,8.,Q.33,..2  established.,'.3'6,8.Y.2 YOMinor source baseline date: The earliest date after the trigger date on which aW62$'27$),2.',6,8.,86,,.$,'8.,-,$5,$33,$8.,16L6)6...2 Ucomplete PSD application is received by the reviewing agency. After this date, actual)2Q7,,80G.77(.25'$,(,4,8336+$,4,L63.3+6)3H,$6&8.,-)7..-                     ՜.+,D՜.+,T hp  CH2M HILL, Inc.J"1  Appendix 87 Appendix 8.1C Protocol for Increments Analysis Title Headings(NV _PID_GUIDToolsetAN{534F4F87-ED69-11D0-865E-781504C10000}  !"#$&'()*+,-./0123456789:;<=>?@ACDEFGHILRoot EntryEH F`'46saN1TablesW0PP000pp0WordDocument0000000ppPP00P%8@SummaryInformation00p(0000%89DocumentSummaryInformation28& 001.doc.deBjCompObj O :i+00  +00*P:\j5003ObjectPoolod%rity=Imp6sa6sati  8w~< L\ L0@_   FMicrosoft Word Document MSWordDocWord.Document.89q