APPENDIX G 

Okemo Limited Liability Company 

Operating Permit RACT provisions 

AOP-04-029 

Issued on February 26, 2006 

Only portions highlighted are intended for inclusion in the SIP. 

Strikeout text is not intended for inclusion in SIP. 
v  Ridge .,u.. 

v 

SGi irne ; 25 Stationary Diesel Fa Rginess 

Ludlow, 

77 Okeme Ridge Read 

Vermont 05149 
Okemo Limited Liability Company #AOP-04-029 

FIN DIN GS OF FACT 

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Okemo Limited Liability Company #AOP-04-029 

Bate-e#y4sEien 

May 5, 1999 

januaFy 31, 1995 

May-2&, ~~ 

September 5, 2000 

d^^ ~, 21, 2003 

4 GonstwGtAGR deadline 
Okemo Limited Liability Company #AOP-04-029 

FACILITY PERMIT APPLICABILITY 

Future Allowable Aor Contaminant Emissions (tensi y eaW 

RMIPM-t9 502 NO* 

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Okemo Limited Liability Company #AOP-04-029 

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Okemo Limited Liability Company #AOP-04-029 

REVIEW FOR TI-IC DCDMIT T- Q OPERATE 

Subsequent to April 30, 1970. 

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Okemo Limited Liability Company #AOP-04-029 
Okemo Limited Liability Company #AOP-04-029 

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Okemo Limited Liability Company #AOP-04-029 

PERMAIT CONDITIONS 

0 V.S .A. ~4556(c) and 556a(d)l (1) of the Regal-- 

(2) The Permittee shall c6rrtrol emissions from the ekii ting Caterpillar 3516 diesel engine by 

operating a combined selective catalytic reduction system _(SCR) control device and 

oxidation catalyst that is designed and operated to achieve a minimum of ninety (90) 

percent reduction in the emissions of nitrogen oxides (NOx) during all periods of 

operation of the engine. The SCR control device :'system shall also be designed and 

operated `to` limit ammonia< slip erriissicins in the; ;c~utl"otexhaust during all periods of 

operation of the engine . All elements of these air ;poElution control systems shall be 

maintained in good working order at all times and operated in accordance with the 

manufacturer's operation and maintenance recommendations. The air pollution control 

system shall be in operation whenever the respective emission source is in operation. 

[10 V. S.A §55fia(d)] [§5-251(3) of the Regulations] [RAGT Determination - September 2000] 

and -566 a(d)} 
Okemo Limited Liability Company #AOP-04-029 

- Operational Limitations - 

(5) The total capacity for all leased internal combustion engines operated at the Facility for 

purposes of generating compressed air for snowmaking, excluding engines classified as 

emergency use only, shall not exceed -11,515 brake horsepower combined. [10 v.S.A . 

§§556(c)] [§5-251(3) of the Regulations] 

(6) The total capacity for diesel engine generators operated at the Facility for purposes of 

generating electricity for snowmaking purposes shall not exceed 4,292 brake 

horsepower combined. [10 v.s .A . §§556(c) and 10 V.S.A . §556a(d)] 

(7) The annual fuel consumption in .the stationary diesel engine units shall not exceed a 

combined 876,000 gallons per calendar year, based upon any rolling twelve (12) 

consecutive calendar month period: [1o VS A. §§556(c) and 556a(d)] [§5-251(3) of the Regulations] 

(g) The hours of operation of the Caterpillar 3516 diesel engine equipped with an oxidation 

catalyst and selective catalytic reduction technology shall not exceed 1,500 hours based 

on any rolling twelve consecutive calendar month period . [10 Vs.A. §§556(c) and 556a(d)] [§5-

251(3) of the RegutatJons] [Permit # OP-99-013] 

(10) The hours o¬ operation of the two (2) Caterpillar 3516B diesel engine generators 

operated alt the Facility for purposes of generating electricity for snowmaking purposes 

shall not exceed III the following hour limits based on each engine's federal Tier 

certification: 

(a) "The two (2) engines shall 'not exceed, a combined 1,500 hours based on any 

rolling twelve c©nsecutive calendar month, period when the most stringent 

certification isTier I ; arid 

(b) e The two (2) engines shall not . exceed a combined 2,000 hours based on any 

rolling twelve consecutive caiendar rriorrtli peri4d when th~ most stringent 

certifidation is Tier Il': 

[10 V.S.A: §§556(c) .and 556a(d)] [§5-251(3) of the Regulations] [Permit # OP-99-013] 

(11) Oniy No. 2 fuel 611, off-road diesel fuel',- htghway-grade diesel fuel, or lighter grade fuel 

oils .with a maximum sulfur content not to exceed 0.5 percent by weight may be used as 

fuel in the stationary diesel engine units unless, the Permittee obtains prior written 

approval from the Agency to use another type of fuel. [10 v.s.A . §§556(c) and 556a(d)) [§§5-501 and 

5-1015(a)(1)-of the Regulations] 
Okemo Limited Liability Company #AOP-04-029 

the Regulations] 

- Emission Limitations - 

(14) Emissions from all stationary diesel engines purchased, rented or leased at the Facility, 

excluding the two (2) rental Caterpillar 3516B engines, shall, at a minimum, comply with 

the following limits : 

Pollutant Emission Limitations 

Pollutant 

Emission Limitations 

g/bhp-hr' ppmvd ~ 

Nitrogen oxides (as N02) 4.8 350 

Carbon monoxide 2.6 315 

Particulate matter 0.15 0.021 gldscm 

1 g/bhp-hr equals grams of pollutant emitted per brake horsepower hour. 

2 ppmvd equals parts per million volume on a dry basis corrected to fifteen (15) % oxygen. 

Any emission testing conducted to demonstrate compliance with the above emission 

limit shall be performed in accordance with 40 CFR Part 60, -Appendix A, Reference 

Methods 5, 7E, and 10 or equivalent methods approved in writing by the Agency, at the 

rated load and speed of the engine. Alternatively, comp[iati.ce may be demonstrated by 

verifying that the engine has met the engine certification requirements of 40,CFR, Part 89 

for the Tier H_ emission standards or better . [1o v.s.a . §§s56(c) and 556a(d)J [§§5-251(3), 5-271 and 5- 

404 of the Regulations] 
Okemo Limited Liability Company #AOP-04-029 

(15) Emissiians from the SCR equipped C.atelCpillar 3 

emission limits specified in the table below; 

1~6 an 

I 

gine shall not exceed the 

Pollutant Emission Limitations 

Pollutant 

Emission Limitations 

g/bhphr' Ibs/hr 1 

Nitrogen oxides (as N02) 1 .6 5.2 

Carbon monoxide Q.6 1 .8 

Particulate matter 0.04 0.1 

' glbhphr equals gra;rrts, of pollutant emitted per brake horsepower hour . 

2 Ibsfhr equals pound of pollutant emitted, perhour. 

Any emission testing conducted to derrionstrate compliance with the above emission 

limit shall be, performed ~ in ;, accordancea 'with ,40 CFR Part- 60, . AppendixY A; Reference 

M~theds 5; 7E , and 10 or equivalerit' methods approved in writing by the Agency at the 

rated load land speed of the engine. [1o V.s.A . 55sa(d)i [§§s-251(3) and 5-404 of the Regulations] [Permit 

# oP-99-o13] 
Okemo Limited Liability Company #AOP-04-029 

(18) Emissions from the two (2) rental Caterpillar 3516B engines shall, at a minimum, comply 

with the following emission limits for the 2005-2006 ski season : and the more stringent 

emission rates no later than July 1, 2007 : 

Pollutant Emission Limitations 

2005-2Q06 Ski Season Emission Limitations 

Pollutant 

Emission Limitations 

g/6hp-hr' ppmvd ` 

II, Nitrogen oxides (as N02) 6.9 505 

Carbon monoxide 3.0 360 

Particulate matter 0.45 0.063 g/dscm 

July 1, 2007 Emission L.imitations 

Pollutant 

Emission Limitations 

g/bfip-hr' ppmvd '` 

Nitrogen oxides (as N02) 4.8 350 

Carbon monoxide 2.6 315 

Particulate matter 0.15 0.021 g/dscm 

' g/bhp-hr equals grams of pollutant emitted per brake horsepower hour. 

2 ppmvd equals parts per million volume on a dry basis corrected to fifteen (15) °to oxygen . 

Any emission testing conducted to demonstrate compliance with the above emission 

lirnit shall be'performed in accordance with,'4Q OFR Part 60, Appendix A, Reference 

Methods 5; 7E, and- 'FO or equivalent methods approved :iri writing by the Agency at -the 

rated load and speed of the engine. Alternatively, compliance may be demonstrated by 

verifying that the engine has met the engirie oertification requirements of 40 CFI~ Part 89 

for the Tier 11 emission standards or better. 11o v.s.a . ~§556(c) and 556a(d)I I§§5-251(3), 6-271 and 5- 

404 of the Regulations] 
Okemo Limited Liability Company #AOP-04-029 

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Okemo Limited Liability Company #AOP-04-029 

- Compliance Testing and Monitoring - 

(23) The Permittee shall, within 90 days upon issuance of this Permit, develop and implement 

an operation and maintenance plan for the Facility engines as well as for the SCR 

catalyst emission control system on the Facility's Caterpillar 3516 diesel engine: ,The 

plan shall address standard operation Ond maintenance procedures such as routine 

engine tune-ups, filter changes;d6talyst~deaning frequencies (not tor :exceed every 500 

hours) and routine inspections, including inspection of the urea injection nozzles. The 

plan shall also include, but pot be limited to, predicted equipment replacement intervals, 

appropriate monitoring parameters to ensure proper ,op eration, provisions . .for 

maintaining records" 6f routine maintenance inspections, findings~ of those inspections, 

and any corrective actions 

which 

wei~e taken . :fn addition, the plan shall also include 

provisions for testing the exhaust gases from ;, at a rriiriimurri ; the Caterpillar 3516 diesel 

engine with a portable NOx analyzer .and computing the .NOx destruction efficiency. 

Such testing shall be conducted, -at a: rninimum; ;2itthe-begirining and midpoint of each 

snowmaking season. The portable analyzer shall be operated, maintained and 

calibrated in accordance with the manufacturer's recommendations . The Permittee shall 

revise this plan at the Agency's request or on its own motion to reflect equipment or 

operational changes. Said operation and maintenance plan shall be present at the 

Facility at all times and shall be made available to representatives of the Agency upon 

request . [io V.S.A . §§556(c) and 556a(d)] [§§5-251(3) and 5-404 of the Regulations] 

(24) The Permittee shall monitor and record the urea injection quantities on a daily basis 

during periods of engine operation in order to establish the normal operating parameters 

for the SCR system and to thereafter determine periods of abnormally high or low urea 

usage which could indicate stuck open or plugged injectors, respectively, or other 

problems requiring immediate maintenance. [1o v,s.A. §§556(c) and 556a(d)] [§§5-251(3) and 5-404 of 

the Regulations] 

- Record Keeping and Reporting - 

(25) Records of Fuel Use: The Perrnittee shall maintain records o# the total quantity of fuel oil 

consumed in the Facility engines combined; in= gallons, each month. [io v.s.A . §§556(c) and 

556a(d)] 1§5-405(1) of the Regulations] 

(26) Records of Fuel Certifications ; The Permittee shall obtain from the fuel supplier, for 

each shiprrient of fuel oil received at the Facility for use in the engines; a certification or 

invoice stating the sulfur content of the fuel oil. The certification or invoice shall include 

the name of the fuel oil supplier,,date of delivery, fuel type, quantity of fuel oil delivered, 

and a statement from the fuel oil supplier that the oil complies with the specifications for 

fuel oil numbers 1 or 2, as defined by the American Society of Testing and Materials in 

ASTM 1a396, "Standard Specifications for Fuel Oils" ora statement as to the sulfur 

content of the fuel oil in percent sulfur by weight. [io v.s.A . §§556(0) and 556a(d)J [§5-405(1) of the 

Regulations] 
Okemo Limited Liability Company #AOP-04-029 

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(31) Semi-Annual Periodic Monitoring Reports: Within thirty (30) days after July 1 and 

,January 1,, of each year or an alternative schedule if, approved in writing by the Agency, 

the Permittee shall submit to the Agency a report containing the following information 

regarding the preceding six (6) months: 

(a) a summary of the fuel usage records required by this Permit ; 

(b) a summary of all O&M performed on the Facility's engines and SCR catalyst 

emission control system; 

(c) a summary of the urea injection usage rates; 

(d) the results of any emission testing performed on the Facility engines including 

results_ from the use of the portable NC3x analyzer, including the NOx reduction 

efficiency calculation for the Caterpillar 3516 unit ; and 

(e) a statement of the sulfur content of any _and all fuel delivered to the Facility for 

use in the engines during the reporting period . 

[§§5-402(1), 5-405(1) and 5-1015(5) of the Regulations) 
Okemo Limited Liability Company #AOP-04-029 

(32) Prior to each ski season the Permittee shall, in writing, provide the Agency with the 

following 'information, for each owned, rented and leased engine operated at the Facility, 

excluding emergency use only engines: 

(a) A listing, of each engine proposed, to be 

season; 

erated at the Facility during .the ski 

(b) A summary of engine and ernlssiori speeifications;: 

(c) A cumulative listin~ of the manufacturer's= ratecf horsepower output of each 

engine with. a certify statement that the Facifitjv=vitide cumulative horsepower 

capacity does .not exceed, the limits specified in this P~rmit ; and 

(d) A certification that all enine emission, rates meet the respective emission limits 

outlined in this Permit . 

[10 VS.A . §§556(c) and 556a(d)] [§§5-251(3), 5-271 and 5-404 of the Regulations) 

FepAFtfng -peFiAd . 

Boston, MA 02203 

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Okemo Limited Liability Company #AOP-04-029 

Air Pollution Central Division 

_ Stratospheric Ozone ProteGtion 

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- Meter Veh"Gles 
Okemo Limited Liability Company #AOP-04-029 

but is not limited to: 

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Okemo Limited Liability Company #AOP-04-029 

kept by thi6 Permit. 

§78 6(2)(6~v)] . 

656&(d)3 

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Okemo Limited Liability Company #AOP-04-029 

Regulations] 
Okemo Limited Liability Company #AOP-04-029