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CHAPTERFOUR Enuironmenta~ ~eonsequences <br />Maximum estimated annual emissions from the sources of air pollutants listed above for the <br />Pazachute Site are summarized in Table 4.5-1. Table D-2, in Appendix D presents a summary of <br />the Parachute Site emission sources with maximum estimated annual emissions for each source. <br />Some fugitive dust is expected to result from the traffic on the paved and unpaved roads. <br />Although this fugitive dust would cause some localized visible dust, the emissions are expected <br />to be temporary and would not be significant. <br />Air Quality Effects <br />Piceance and Parachute Sites <br />Air quality effects were predicted using the Industrial Source Complex Short-Term model, <br />Version 3 (ISCST3). The dispersion modeling analysis was performed in two sL~ps. First, a <br />significant impact analysis was performed to estimate geographic extent of ambient air impacts <br />resulting from the Proposed Action. A cumulative impact analysis was then performed using the <br />results of the significant impact analysis to determine the sources in the vicinity of the project to <br />include. Table 4.5-2 presents the significant impact levels and distances of imptict from the <br />Piceance and Parachute Sites. <br />TABLE 4.5-2 <br />SIGNIFICANT IMPACT AREA AND DE MINIMUS <br />MONITORING ANALYSIS <br /> <br />;. >:.::•::;: <br />.:.:.:.....:.::..::..:.. .:....: <br />:::':::.::::::: < ,:.::::::::: <br />::.:::.:....:::...:....:.:.. ............ <br />i:.($' ificaet:.:'' <br />::::Paraciiuteaai $ei::: <br />P:..::..: <br />~ce<<tice:::.I:m: act:: <br />::....:::.::.::.:::...:.:.:..,.. <br />:::'.:':'; :::::.:::..::::':: :::'::::Aver: .:. ;.-Im..ct=L::evel::' .:.' ::':Aim Dstance."..;;' :::'Area:Disance. •;:> <br />:._PuI1u€aa€;:; <br />. ~ :....::..:::..:.....:.::~. ::.::::Iatervalr..: <br />: .....:.:::.: ~:..:.. ,: ~.. ~:: ~ :~. .<;:';:•;. tn.::.°;:> :: <br />..,:::: ~lA r},~::.:.. )....:. .::::: :::::miles .kt>ff:::.:?.:.: <br />: ......., :....,...: ~......),..... ,. .;::<: <br />.: ~:.: a14IC&~:(Itt-t);:~.~:: ~: <br />N02 Annual 1 5.1 (8.5) ].4 (2.4) <br />CO 1-Hour 2,000 -- 0.06 (0.1) <br /> 8-Hour 500 0.8(1.3) 0.06(0.1) <br />PM10 24-Hour 5 2.2 (3.6) ].2 (2.0) <br /> Annual 1 2.2 (3.7) C'.8 (1.4) <br />Source: RTP 1998a,b <br />A list of the companies where sources were selected to include in the cumulative modeling <br />analyses is presented in Table D-1, in Appendix D. The number of sources that ~,vere included in <br />the cumulative source inventory was 35 for NOx, four for PM~o, and none for CO. <br />Receptor Grid <br />The receptor locations are important because the models estimate pollutant concE;ntrations only at <br />these points. A Cartesian receptor grid was developed for the facility. These receptor grids are <br />described and graphically presented in Figures D-1 and D-2 in Appendix D. <br />4-22 Meteorology and Air Quality <br /> <br />