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~~~n~s ~~~ss©ciAT~s~ iNC~ ~~(~ <br />CONSULT[NG ENGINE~I2S <br />1.11 GOMMUNWEALTH COURT, SUITE 104. CARY, NC 27511-4464 <br />_ PN4NE; (919) 319-1187 FAX: (919) 4131-1522 <br />August 25, 1998 <br />Project No: X97,945-595 <br />Mr. Thomas C. Allen,lz <br />Environmental Engineering Supervisor <br />NC DErTNR Division of Air Quality <br />P.O. Eon 29580 <br />Raleigh, North Carolina 27626-p5S0 <br />Tra~><smittai <br />Recalculatiozl of NMOC lJmissians for Title `V Applicability <br />Orange Regional Landfill (1v1SWLF Permit No. 68-O1) <br />. ~ •Chapel bill, North Carolina <br />Dear Mr.Allen: <br />On behalf of the Tovvn of Chapel, North Carolina, Alines &: Associates, Inc. (ACMES) has <br />recalculated ale rate ofpa:st and futureNon,Methane Organic Compound (NMOC) emissions fox <br />the Orange Regional Landflll. The Landfill is composed of ttivo distinct 1viSW disposal units <br />located on sepaxate tracts bisected by. Eubanks Road. T'he Northern anal Southern MSW disposal <br />.units of the Orange Regional Landf 11 have; beef Considered a single emissions source in our <br />evaluations. <br />This work fulfills the requirements of the second option stated in,your letter to Orange Ragioz~al <br />Landfill dated December 1, 1997. Specifically, those options were to either: 1) submit an, <br />application for a Title V operating permit or 2) subz;zit additional laz-ldfill docunzentatior3. and <br />recalculation of NIvIOC emissions demonstrating that the solid waste facility's potential to emit <br />regulated air •pollufants is below the 100 tonlyear Title V applicabilif~~ threshold. The North <br />Carolina Departnserlt of Environrxlent & Natural Resources, Divisio>la of Air Quality's (DAQ) <br />request for fu~,~tller facility doeumez~tation and/or permitting was based on the results of the <br />DAQ's calculations of late 1997. The DAQ's calculations, based on information. provided in the <br />Inftial Deszgr~.Capczcity Report, suggested elevated landfill air emissions rates i'or Orange <br />k~egional Landfill {Table 1): <br />A general. tinge extension vas granted bar the DAQ to a nun-~ber of MS~Xr Iandfzlls, 111CIUC11ng <br />Orange Regional Landfill, following concerns with the short response petzod, t13.e accuracy of the <br />DAQ's December landfill emission estimates, and potential for misinterpretation of the.data <br />presented in the .Initial Design Capacrry Feport. Most notable, the DAQ's calculations were .. <br />partially based on the very conservative ix3odel and default gas generation factors promulgated to <br />evaluate NSPS applicability rather than the Al'-42 default factors published for Title `V purposes. <br />