RULE4309 DRYERS, DEHYDRATORS,AND OVENS (Adopted December 15,2005) 1.0 Purpose The purpose of thls rule is to limit emissions of oxides of nitrogen (NOx) and carbon monoxide (CO)from dryers,dehydrators, and ovens. 2.0 Applicability Thisrule applies to any dryer, dehydrator, or oven that is fired on gaseous fuel, liquid fuel, or is fired on gaseous and liquid fuel sequentially, and the total rated heat input for the unit is 5.0million British thermal units per hour (5.0MMBtuJhr)or greater. 3.0 Definitions 3.1 APCO: as definedin Rule 1020(Definitions). 3.2 ARB: CaliforniaAir Resources Board. 3.3 Bake: to cook foodin aunit with 

### dryheat. 3.4 Btu: British thermal unit, the amount of heat required to raise the temperature of one pound of water from 59°F to 60°Fat one atmosphere. 3.5 CEMS: continuousemission monitoring system. 3.6 CFR: the Code ofFederal Regulations. 3.7 Charbroiler: as defined in Rule 4692 (CommercialCharbroiling). 3.8 CO: carbon monoxide. 3.9 Dehydrator: a device that drives free water from products like fruits, vegetables, and nuts, at an accelerated rate without damageto the product. 3.10 Dryer: a device in which material is dried or cured in direct contact with the products of combustion. 3.11 Fry: to cook food over directheat in oil or fat. 3.12 Gaseous Fuel: a fuel that is a gas at standard conditions. 3.13 Heat Input: the heat, on an hhv basis, released due to fuel combustion in a unit, not includingthe sensibleheat ofincomingcombustion air and fuel.

SJVUAPCDHigher Heating Value (hhv): the total heat liberated per mass of fuel burned, in Btu per pound, when fuel and dry air at standard conditions undergo complete combustion and all resulting products are brought to their standard states at standard conditions. Liquid Fuel: a fuel that is a liquid at standard conditions. MMBtu: one million (1,000,000) British thermal units. Normal Business Hours: the time period Monday through Friday, 8:00am to 5:00 Pm. NOx: the sum of oxides of nitrogen in the flue gas, expressed as nitrogen dioxide (N02). Oven: a chamber in which material is dried or cured in direct contact with the products of combustion. Oxygen Correction Factor: the factor used to adjust measured emission readings to an emission rate at a reference oxygen (02)level. Forpurposes of thisrule: 3.20.1 For units operating at measured 02 concentrations 19.0 percent by volume (19.0 vol% 02) or less, emission concentrations shall be corrected to 19.0 vol% O2using the appropriate equationin Section 8.1. 3.20.2 For units operating at measured 02concentrations greater than 19.0 vol% 02,the correctedNOx or CO concentration is equal to the measuredNOx or CO concentration. Parts Per Million by Volume (ppmv): as defined in Rule 1020 (Definitions). PTO: Permit to Operate issuedby the District. Public Utilities Commission (PUC) Quality Natural Gas: a gas-containing fuel where the sulfur content is no more than one-fourth (0.25) grain of hydrogen sulfide per one hundred (100) standard cubic feet and no more than five 

### (5) grains of total sulfur per one hundred (100) standard cubic feet. PUC quality natural gas also means high methane gas (at least 80% methane by volume) as specified in PUC General Order 58-A. PUC Quality Natural Gas Curtailment: a shortage in the supply of PUC quality natural gas, due solelyto supply limitations or restrictions in distribution pipelines by the utility supplyingthe gas, and not due to the cost of natural gas. Rated Heat Input: the heat input capacity specified on the nameplate of the unit. For the purposes of this rule, if the unit has been physically modified such that its

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### maximumheat input differs from what is specifiedon the nameplate, the modified maximum heat input shall be considered as the rated heat input and made enforceableby 

### PTO. 3.26 Re-ignition: the relighting of a unit after an unscheduled and unavoidable interruption or shut off of the fuel flow or electrical power, for a period of less than 30minutes, due to reasons outsidethe control of the operator. 3.27 Shutdown: the period of time during which a unit is taken from an operational to a non-operational status by allowing it to cool down from its operating temperature to ambient temperature as the fuel supply to the unit is completely turned off. 3.28 Solid Fuel: afuelthat is a solid at standard conditions. 3.29 Standard Conditions: as defined in Rule 1020 (Definitions). 3.30 Start-up: the period of time during which a unit is brought from a shutdown statusto its operatingtemperature and pressure, including the time required by the unit's emissioncontrol system to reach full operation. 3.31 StationarySource: as definedin Rule 2201 (New and Modified Stationary Source Review Rule). 3.32 US EPA: the United StatesEnvironmental Protection Agency. 3.33 Unit: a dryer, dehydrator, or oven, or any combination of such devices, with one or more burners and one or more exhaust stacks, that are collectively operated as the source(s) of heat to dry or cure a product. Associated VOC control systems, such as thermal oxidizers or afterburners, are not considered part of the unit for purposesof this rule. 4.0 Exemptions 4.1 The requirementsof this rule shallnot applyto the following: 4.1.1 Column-type or tower dryers used to dry grains, or tree nuts. This exemption doesnot apply to tunnel dryers, belt dryers, or tray dryers. 4.1.2 Units used to pre-condition onions orgarlic prior to dehydration. 4.1.3 Smokehousesor units used forroasting. 4.1.4 Units used tobake orfry food forhuman consumption.

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### 4.1.5 Charbroilers.

### 4.1.6 Units used to dry lint cotton orcotton at cotton gins. 4.1.7 Units with all of the followingcharacteristics: 4.1.7.1 No stackfor the exhaust gas, and 4.1.7.2 One ormore sides open to the atmosphere. 4.2 The requirements of this rule shall not apply to units subject to any of the following rules: 4.2.1 Rule4305 (Boilers, SteamGenerators, and Process Heaters -

### Phase 2) 4.2.2 Rule4306 (Boilers, SteamGenerators, andProcess Heaters -

### Phase 3) 4.2.3 Rule 4307 (Small Boilers, Steam Generators, and Process Heaters - 

### 2.0 MMBtdhrto 5.0MMBtdhr) 4.2.4 Rule 4351 (Boilers, SteamGenerators, and Process Heaters -

### Phase 1) 4.3 The requirements of Section 5.1 

### and Section 5.2 shall not apply to a unit when burning any fuel other than PUC quality natural gas during PUC quality natural gas curtailment provided all of the following conditions are met: 4.3.1 Fuels other than PUC quality natural gas are burned no more than 168 cumulative hours in a calendar year plus 48 hours per calendar year for equipment testing, as limitedby PTO. 4.3.2 NOx emission shall not exceed 30 ppmv referenced at dry stack conditions and adjusted using the oxygen correction factor as defined in Section 3.0 or 0.215 lb/MMBtu. Demonstration of compliance with this limit shall be made by source testing, CEMS, an APCO-approved AlternateMonitoring System, or an APCO-approved portable NOx analyzer. 5.0 Requirements All ppmv emission limits specified in this section are referenced at dry stack gas conditions and adjusted using the oxygen correctionfactoras definedin Section 3.0. 5.1 Dehydrators shall be fired exclusively on PUC quality natural gas, except during periods of PUC quality natural gas curtailment. 5.1.1 All dehydrators shall be operated and maintained according to manufacturer's specificationsorAPCO-approved alternativeprocedures.

SJVUAPCD5.1.2 Operation and maintenance records and manufacturer's specifications/APCO-approvedalternative procedures shallbe maintainedin accordance with Section 6.1.3. 5.1.3 During PUC quality natural gas curtailment, the dehydrator shall be in compliance with the provisions of Section4.3. 5.2 For any unit subject to this rule, except dehydrators, NOx emissions and CO emissions shall not exceed the limits specified in Table 1 on and after the full compliance schedules specified in Section 7.1, Table 2 compliance schedule, or Section 7.3, as appropriate. Table 1 NOx and CO Limits (Referenced at dry stack conltions and adjusted using the oxygen correction factor as defined in Section 3.0)

5.3 Start-upand Shutdown Provisions The applicable emission limits in Section 5.2 shall not apply during start-up or shutdown provided an operator complies with the requirements specified below. 5.3.1 For units not equipped with aNOx exhaust control system, the duration of each start-upand each shutdown shallnot exceed one hour, except as provided in Section 5.3.3. 5.3.2 For units equipped with a NOx exhaust control system, units shall meet both of the following requirements: 5.3.2.1 The NOx exhaust control system shall be in operation and emissions shall be minimized as much as technologically feasible during start-up or shutdown. 5.3.2.2 The duration of each start-up and each shutdown shall not exceed two hours, except as provided in Section 5.3.3. 5.3.3 Notwithstanding the requirements of Section 5.3.1 or Section 5.3.2, the APCO, ARB, and US EPA may approve a longer start-up or shutdown

SJVUAPCDduration, if an operator submits an application for a PTO condition which provides ajustification for the requested additional duration. 5.3.3.1 The maximum allowable duration of start-up or shutdown will be determinedby the APCO, ARB, and US EPA. 5.3.3.2 At a minimum, ajustification for increased start-up or shutdown duration shall includethe following: 5.3.3.2.1 Clear identification of the control technologies or strategiestobe utilized; and 5.3.3.2.2 Description of what physical conditions prevail during start-up or shutdown periods that prevent the controls frombeing effective;and 5.3.3.2.3 Reasonably precise estimate as to when the physical conditions will have reached a state that allows for the effective control of emissions;and 5.3.3.2.4 Detailed list of activities to be performed during start-up or shutdown and a reasonable explanation for the length of time needed to complete each activity; and 5.3.3.2.5 Description of the material process flow rates and system operating parameters the operator plans to evaluate during the process optimization and an explanation of how the activities and process flow affect the operation of the emissions control equipment; and 5.3.3.2.6 Basis for the requested additionalduration of start-up or shutdown. 5.3.4 FTO changes solely to include start-up or shutdown conditions may be exempt from the Best Available Control Technology (BACT) and emission offset requirementsif the FTO change meets the requirements of Rule 2201 (New and Modified Stationary Source Review Rule) Section 4.2 (BACT Exemptions) and Rule 2201 Section 4.6 (Emission Offset Exemptions). 5.4 Monitoring Requirements

SJVUAPCD5.4.1 Except for dehydrators, the operator of any unit subject to the applicable emission limits in Sections 4.3.2, or 5.2 shall monitor emissions using one of the techniques specifiedin Sections 5.4.1.1 or 5.4.1.2. 5.4.1.1 Install and maintain an APCO-approved CEMS for NOx, and oxygen that meets the requirements of Sections 5.4.1.1.1 through 5.4.1.1.6. 5.4.1.1.1 40 CFR Part 51, and 5.4.1.1.2 40 CFR Parts 60.7 and 60.13 (except subsection h), and 5.4.1.1.3 40 CFR Part 60 Appendix 

### B (Performance Specifications),and 5.4.1.1.4 40 CFX Part 60 Appendix 

### F (Quality Assurance Procedures), and 5.4.1.1.5 The applicable provisions of District Rule 1080 (Stack Monitoring). 5.4.1.1.6 The APCO shall only approve CEMS that meets the requirementsof Sections 5.4.1.1.1 through 5.4.1.1.5 of this rule. 5.4.1.2 Install and maintain an alternate emission monitoring method that meets the requirements of Sections 5.4.1.2.1 through 5.4.1.2.3 of this rule. 5.4.1.2.1 The APCO shall not approve an alternative monitoring system unless it is documented that continued operation within ranges of specified emissions-related performance indicators or operational characteristics provides a reasonable assurance of compliance with applicable emission limits. 5.4.1.2.2 The approved alternate emission monitoring system shall monitor operational characteristics necessary to assure compliance with the emission limit. Operational characteristics shall be one or more of the following:

SJVUAPCD 5.4.1.2.2.1 Periodic NOx exhaust emission concentrations,5.4.1.2.2.2 Periodic exhaust oxygen concentration, 5.4.1.2.2.3 Flow rate of reducing agent added to exhaust, 5.4.1.2.2.4 Catalyst inlet and exhaust temperature, 5.4.1.2.2.5 Catalyst inlet and exhaust oxygen concentration, 5.4.1.2.2.6 Periodic flue gas recirculation rate, 5.4.1.2.2.7 Other surrogate operating parameter(s) that demonstrate compliance with the emission limit. 5.4.1.2.3 The operator shall source test over the proposed range of surrogate operating parameter(s) to demonstrate compliancewith the applicable emission limits. 5.4.2 Operators of a dehydrator shall maintain records that demonstrate, to the satisfactionof the APCO, ARB, and US EPA that the dehydratoris: 5.4.2.1 Fired exclusively on PUC quality natural gas, except during PUC quality natural gas curtailment, and 5.4.2.2 Properly operated and maintained according to manufacturer's specificationsor APCO-approved alternative procedures. 5.4.3 Operators shall maintain records of emissions and emissions monitoring systemspursuant to Section 6.1. 5.5 Compliance Determination 5.5.1 All emissions measurements shall be made with the unit operating either at conditions representativeof normal operations or conditions specifiedin the 

## Fro. 5.5.2 Except for as provided in Section 5.5.3, no determination of compliance shall be established within two hours after a continuousperiod in which fuel flow to the unit is shut off for 30 minutes or longer, or within 30 minutes after are-ignition as definedin Section3.0. 5.5.3 Notwithstanding the requirements of Section 5.5.2, the APCO, ARB, and US EPA may approve a longer or shorter period before compliance

SJVUAPCDdetermination, if an operator submits an application for a PTO condition which provides ajustification for the requested duration. 5.5.4 All CEMS emissions measurements shall be averaged over a period of 15 consecutive minutes to demonstrate compliance with the applicable emission limits of this rule. Any 15-consecutive-minuteblock average CEMS measurement exceeding the applicable emission limits of this rule shall constitute a violation of this rule. 5.5.5 For emissionsmonitoring pursuant to Section 5.4.1.2.2.1,emission readings shall be averaged over a 15 consecutive-minute period by either taking a cumulative 15-consecutive-minute sample reading or by taking at least five (5) readings evenly spaced out over the 15-consecutive-minuteperiod. 5.5.6 For emissions source testing performed pursuant to Section 6.3.1 to determine compliance with an applicable emission limit of this rule, the arithmetic average of three (3) 30-consecutive-minutetest runs shall apply. If two of the three runs individually demonstrate emissions above the applicable limit, the test cannotbe used to demonstrate complianceforthe unit, even if the averaged emissions of all three test runs is less than the applicable limit. 6.0 Administrative Requirements 6.1 Recordkeeping 6.1.1 For operators using CEMS to monitor emissions,the followingrecords shall be kept on adaily basis: 6.1.1.1 Totalhours of operation. 6.1.1.2 Typeand quantity of fuel used during operations. 6.1.1.3 NOx emissions as tested. 6.1.1.4 Stackgas oxygen content. 6.1.1.5 NOx emissions corrected to 

### dry stack conditions and adjusted using the oxygen correction factor shall be reportedin ppmv. 6.1.1.6 CO emissions corrected to 

### dry stack conditions and adjusted using the oxygen correction factor shallbe reported in ppmv. 6.1.2 For operators using an alternate emission monitoring system, the following records shallbe kept on aperiodic basis:

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### 6.1.2.1 Totalhours of operation. 6.1.2.2 Type and quantityof fuel used during operations. 6.1.2.3 Measurement for each surrogateparameter. 6.1.2.4 Range of allowed values for each surrogate parameter. 6.1.2.5 The period for recordkeeping shall be specified in the PTO conditions. 6.1.3 The operator ofadehydratorshall maintain the followingrecords: 6.1.3.1 Records that show the dehydrator is fired exclusively on PUC quality natural gas, except during PUC quality natural gas curtailment. 6.1.3.2 Operation and maintenance records that demonstrate operation of the dehydratorwithin the limits of the manufacturer's specification and maintenance according to manufacturer's recommendation or APCO-approved alternative procedures. 6.1.3.2.1 Operation records shall be 

### maintained on a daily basis when the dehydratoris operating on that day. 6.1.3.2.2 The operator shall keep maintenance records that verify that maintenance was performed in accordance with manufacturer's specifications or APCO-approved alternative procedures. 6.1.3.3 A 

### copy of the manufacturer's operation specifications and maintenance instruction manual or APCO-approved alternative procedures shall be maintained on-site during normal business hours. 6.1.3.4 If the manufacturer's operation specifications or maintenance instruction manual are not available, the operator of a dehydrator shall submit alternative operation or maintenance procedures for approval by the APCO and US 

### EPA by July 1,2006. 6.1.4 The operator of a unit subject to Section 5.2 and performing start-up or shutdown of that unit shall keep records of the duration of each start-up and each shutdown. 6.1.5 The operator of any unit subject to this rule and operated under the exemption of Section 4.3shall:

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### 6.1.5.1 Monitor and record, for each unit, the cumulative annual hours of operation on each fuel other than PUC quality natural gas during periods of natural gas curtailment and equipment testing. 6.1.5.2 The NOx emissions for each unit that is operated during periods of PUC quality natural gas curtailment shall be recorded, corrected to dry stack conditions and adjusted using the oxygen correction factor. NOx emissions shallbe reported in ppmv. 6.1.5.3 Failure to maintain records required by Section 6.1.5.1 and Section 6.1.5.2 or information contained in the records that demonstrates noncompliance with the conditions for exemption under Section 4.3 will result in the loss of exempt status for the unit duringPUC quality natural gas curtailment. 6.1.6 The records and manufacturer's specifications required by Sections 6.1.1 through 6.1.5shallmeet all ofthe followingrequirements. 6.1.6.1 Therecords shallbe maintained forfive(5) calendaryears, 6.1.6.2 The records shall be made available on-site during normal business hours, and 6.1.6.3 Therecords shall be submitted to the APCO upon request. 6.1.7 Failure to maintain records or information contained in the records that demonstrates noncompliance with the applicable requirements of this rule shallconstitutea violationof this rule. 6.2 TestMethods The following test methods shall be used unless otherwise approved by the 

### APCO and US EPA. 6.2.1 Fuel hhv shall be certifiedby third party fuel supplieror determinedby: 6.2.1.1 ASTM 

### D 240-87 or

### D 2382-88for liquidhydrocarbon fuels; 6.2.1.2 ASTM D 

### 1826-88 or D 

### 1945-81 in conjunction with ASTM 

### D 3588-89for gaseousfuels. 6.2.2 Oxides of nitrogen (ppmv) -

### US EPA Method 7E, 

### or ARB 

### Method 100. 6.2.3 Carbon monoxide (ppmv) -

### US EPA Method 10,or 

### ARB Method 100.

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### 6.2.4 Stackgas oxygen -

### US EPA Method3 or 3A,

### or

### ARB Method 100. 6.2.5 Stack gas velocities -

### US EPA Method 2. 6.2.6 Stack gas moisturecontent -

### US EPA Method 4. 6.3 ComplianceDemonstration The operator with one or more units subject to this rule shall comply with the followingrequirements: 6.3.1 For purposes of demonstrating compliance, the operators of a dehydrator shall demonstratethat the unit meets the requirements of Section 5.4.2. No otherrequirement of Sections 6.3.2through 6.3.9 shall apply for compliance determination of dehydrators. 6.3.2 Each unit subject to the requirements in Sections4.3, or 

### 5.2 shall be initially source tested to determine compliance with the applicable emission limits not later than the applicable full compliance schedule specified in Section 7.0. Thereafter, each unit subject to Section 5.2 emission limits shall be 

### sourcetested at least once every 24months. Units subjectto Section 5.2 and operating less than 50 days per calendar year shall follow the source test frequency prescribed in Section 6.3.3. 6.3.3 For purposes of sourcetesting, operators of a unit subject to Section 5.2that operatesless than 50days per calendaryear shall be initially source tested to determine compliance with the applicableemission limits not later than the applicable full compliance schedule specifiedin Section 7.0. Thereafter, the unit shallbe tested at leastonce every36 

### months. 6.3.4 Each exhaust stack of a unit subject to the requirements in Sections 4.3 or 5.2 shall be source-tested to demonstrate compliance with the applicable emission limits. 6.3.5 The APCO shall be notified according to the provisions of Rule 1081 (Source Sampling). 6.3.6 Emissions source testing shall be conducted with the unit operating either at conditionsrepresentative of normal ,operationsor conditions specified in the PTO. 

### 6.3.7 All test results for NOx and CO shall be reported in ppmv, corrected to dry stack conditionsand adjusted using the oxygen correction factor.

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### 6.3.8 For the purpose of determining compliance with an applicable emission limit, the arithmetic average of three (3) 30-consecutive-minute test runs shall apply. 6.3.9 If two of the three runs specifiedby Section 6.3.8 individually demonstrate emissions above the applicable limit, the test cannot be used to demonstrate compliance for the unit, even if the averaged emissions of all three runs is lessthan the applicable limit. 6.4 In addition to the provisions of Section 6.3, asphaltlconcrete plants shall choose one of the following options for source testing: 6.4.1 Test the unit using locally mined aggregate in the dryer. If the source test using locally mined aggregate fails, the operator may re-run the source test using aggregatefromadifferentsource. 6.4.2 Test the unit using aggregate from a source different from the source used during normal operations. 6.4.3 Test the unit using aheat-absorbing material in the dryer,but no aggregate. 6.4.4 Testthe unit with no material in the dryer. 7.0 Compliance Schedule 7.1 Group 1 and Group 2 units, as defined in Sections 7.1.1 through 7.1.3, shall be in compliance with applicable requirementsof this rule according to the schedule listed in Table 2, except for asphaltlconcrete plants and dehydrators. Asphaltlconcrete plants shall follow the compliance schedule outlined in Section 7.3. Dehydrators shall follow the compliance schedule outlinedin Section 7.4. 7.1.1 Operators with a single unit that becomes subject to this rule on December 15, 2005 sh.all comply with the compliance schedule for Table 2 Group 2 units. 7.1.2 For operators of multiple units that become subjectto this rule on December 15,2005, Table 2 Group 1units are those units selectedby the operator to be 

### to meet the compliance schedule soonest. The number of units in this group must be at least 50.0% of the total number of units that subject to this rule, roundedupto the nexthighest integer, where required. 7.1.3 For operators of multiple units that become subject to this rule on December 15,2005, Table 

### 2 Group 2 units are the units subjectto this rule and are not Table 2 Group 1units.

S

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### 2Compliance Schedule

December 

### 1,2007

100%of the total number of units subject to this December 

### 1,2008 Units are considered to be subject to this rule if the rule is applicable to the units as defined in Section 

### 2.0and theunits arenot exempted in either Section 

### 4.1or Section

### 4.2. 7.2 As shownin Table

### 2,the column labeled: 

### 7.2.1 "Authority to Construct" identifies the date by which the operator shall submit an Application for Authority to Construct for each unit subject to the rule that would require an Authority to Construct to order to comply with the requirements ofthisrule. 

### 7.2.2 "Full Compliance" identifies the dateby which the operator shall demonstrate that eachunit is in compliance with this rule. 

### 7.3 An operator of an asphalt/concrete unit subject to this rule shall meet the following compliance schedule. 

### 7.3.1 The operator shall submit an Application for Authority to construct for each unit subject tothe rule that would require an Authority to Construct in order to comply with the requirements of thisruleby December 1,

### 2008. 7.3.2 The operator shall demonstrate that each unit subject to this rule is in full compliance with this ruleby December 

### 1,2009. 7.4 An operator of a dehydrator subject to this rule shall be in compliance with this rule byJuly 

### 1,2006.

SJVUAPCD8.0 Calculations 8.1 If the measured 02 is 19.0~01% 

### O2orless, all emission limits specifiedin Section 5.2 are referenced at dry stack gas conditions and 19.0 vol% 02. Emission concentrationsin ppmv shallbe corrected 19.0vol% O2 as follows:

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