Appendix A Source Specific Calculations
Permit Appendix A: Source-Specific CalculationsA.1. Compliance Demonstration for Facilities without RecordsFacilities With No Operating Records Prior to Issuance of this Permit: For emission limits based on a 12-month rolling sum, the Permittee does not have the data to calculate the 12-month rolling sum on a monthly basis. For the first 12 months of operation, the Permittee shall use the emission limits in Table A.1 below:TABLE A.1 – Cumulative Pollutant Emission Limits During First 12 Months of OperationNumber of Months in OperationPollutants subject to 25 tpy limits in the permit: PM, PM10, PM2.5, NOx, CO(tons)Pollutants subject to 5 tpy limits in the permit: Any single HAP(tons)Pollutants subject to 12.5 tpy limits in the permit: Total HAP(tons)150.51270.92391.334111.745132.156152.567172.978193.489213.9910234.31011244.7111225512.5A.2. Calculations for Combustion SourcesThis includes Indirect and Direct Heating Sources and Internal Combustion Engines.A.2.1 NOx and CO emissions limits ≤ 25 tons per year based on a 12-month rolling sum. The emissions during a given month are calculated using Equation A2.1: Equation A2.1 (emission in tons per month):NOx (or CO), tons per month = 0.0005 x [( EF x Q)ng +(EF x Q)lpgb + (EF x Q)lpgp + (EF x Q)do/bio]ihs + [(EF x Q)ng + (EF x Q)do +( EF x Q)g ]rice Where:EF= emission factor for NOx (or CO) (see Tables A.2.1, A.2.2, and A.2.3)Q= actual quantity of fuel purchased or used (whichever was stated in the permit application) per month (use the units that are appropriate to the emission factor for each fuel type)ng= natural gaslpgb= liquefied petroleum gas - butanelpgp= liquefied petroleum gas - propanedo= distillate oilbio= biodieselg= gasolinehs= heating source – direct or indirectrice= reciprocating internal combustion engines0.0005 = conversion factor, ton/lbEmission factors from Compilation of "Air Pollutant Emission Factors (AP-42) Fifth Edition, Emission Factor Listing for Criteria Air Pollutants" and “Emission Factors for Greenhouse Gas Inventories (April 2014, )”are used in Table A.2.1, Table A.2.2, and Table A.2.3.For engines that are model year 2007 or later, the Permittee may use emission factors which were certified by the engine manufacturer. Maintain at the facility a copy of the manufacturer’s certification with the emission factor identified.Table A.2.1Industrial/Commercial Direct and Indirect Heating Sources Emission Factors (EF)PollutantNatural Gas(lb/MMft3)LPG - Butane(lb/1000 gal)LPG - Propane(lb/1000 gal)Distillate Oil(lb/1000 gal)PM7.60.80.73.3PM107.60.80.73.3PM2.57.60.80.73.3SOx0.60.09S0.10S144SNOx100.0151320.0VOC5.50.90.80.2CO84.08.47.55.0Pb0.0005--0.0Table A.2.2Stationary Internal Combustion Engines: Distillate Oil and BioDieselEmission FactorPollutantDistillate Oil (Diesel)(lb/MMBtu)< 600 hp BioDiesel(lb/MMBtu)2- and 4-Cycle EnginesPM0.310.30PM100.310.30PM2.50.310.30SOx0.290.29NOx4.414.45VOC0.360.32CO0.950.90Pb--Table A.2.3Stationary Internal Combustion Engines: Natural Gas CombustionEmission FactorsPollutant2-SLB(lb/MMBtu) 4-SLB(lb/MMBtu)4-SRB(lb/MMBtu)PM0.009910.009910.00991PM100.03840.00007710.00950PM2.50.03840.00007710.00950SOx0.0005880.0005880.000588NOx(%Load)3.17 (90-105)1.94 (<90)3.17 (90-105)1.94 (<90)2.21(90-105)2.27(<90)VOC0.1200.1180.00296CO0.386(90-105)0.353 (<90)3.17 (90-105)1.94 (<90)3.72(90-105)3.51(<90)Pb---Notes:(1)PM=Particulate MatterPM10=Particulate Matter less than 10 microns in aerodynamic diameterPM2.5=Particulate Matter less than 2.5 microns in aerodynamic diameterSO2=Sulfur DioxideNOx=Oxides of NitrogenVOC=Volatile Organic CompoundsCO=Carbon MonoxidePb=LeadMM=MillionBtu=British thermal unitlbs=poundsft3=cubic feetgal=gallonshp= horsepower(2)Natural Gas heating value is 1,050 Btu/standard cubic foot. LPG- Butane heating value is 102,600 Btu/gal.LPG- Propane heating value is 91,500 Btu/gal Gasoline heating value is 130,000 Btu/gal.Distillate Oil (Diesel) heating value is 140,000 Btu/gal(3)S for Distillate Oil: Weight percent sulfur in oil. S indicates that the weight percent of sulfur in the oil should be multiplied by the value given. The maximum weight percent sulfur allowed in this permit is 0.0015%.(4)S for LPG: Sulfur content expressed on grams/1,000 cubic foot gas vapor. S is assumed to be 0.15 grains/1,000 cubic feet vapor which is equivalent to 0.02% sulfur by weight.(5)Biodiesel Emission Factors for criteria pollutants were taken from EPA document “Voluntary Diesel Retrofit Program”, otaq/retrofit/techlist-biodiesel.htm, and for GHG from EPA document “Emission Factors for Greenhouse Gas Inventories (April 2014, )”Permittee With Operating Records Prior to Issuance of this Permit: The Permittee shall not exceed emissions of 25 tons per year of CO calculated as a 12-month rolling sum. Each month’s CO emissions shall be calculated with Equation A1 above, and then added to the previous 11 months’ emissions.The Permittee shall not exceed emissions of 25 tons per year of NOx calculated as a 12-month rolling sum. Each month’s NOx emissions shall be calculated with Equation A1 above, and then added to the previous 11 months’ emissions. A.3. Calculations for Material Usage and Processing OperationsThis includes use of paints, thinners, abrasive blasting material, etc. that can use the provided calculation methods.Emission Units which qualify as insignificant activities or fugitive sources do not need to be included in the calculations.A.3.1 Demonstration of Compliance with Permit LimitsPermittee With At Least 12 Months of Operating Records. Each month, the Permittee shall use the directions in this Appendix to calculate the 12-month rolling sum of the Particulate Matter, VOC, Total HAP, and Single HAP emissions from material usage and processing operations to demonstrate compliance with the limits of this permit. The Permittee shall use their actual operating history to calculate the 12-month rolling sum. Permittee Without 12 Months of Operating Records. Each month, the Permittee shall use the directions in this Appendix to calculate the monthly emissions of the Particulate Matter, VOC, Total HAP, and Single HAP emissions in tons/month from material usage and processing operations to demonstrate compliance with the limits of this permit. The Permittee shall evaluate their compliance based on the months for which they have operating data. The Permittee must then use Table A.1 above to determine if they are under the applicable emission limit. For example, if the Permittee has 3 months of operating data, the Permittee shall sum the monthly emissions for the most recent month and the previous 2 months, and compare the resulting number to the applicable limit in row 3 of Table A.1. Once the Permittee has 12 months of data, then the Permittee must calculate the 12-month rolling sum of the emissions each month, as required above.A.3.2 Material Content IdentificationIf the information is necessary for the Permittee’s calculation method, the material specifications (VOC content, Solids content etc.) shall be determined by the Safety Data Sheet (SDS), Material Safety Data Sheet (MSDS), or Certification of Analysis (COA) provided by the supplier. If a content range is given on the SDS, MSDS, or COA the highest number in the range shall be used for the compliance calculations. If there is information provided in the Regulatory Section of the SDS, the highest number in the range of that section may be used. Other alternative methods approved by the MPCA may be used to determine the material contents.Considerations for Particulate Matter/Solids ContentsEach month, identify the Particulate Matter (PM, PM<10 microns, and PM<2.5 microns) contents in coating materials and other material-usage operations in lbs of Particulate Matter (also known as Solids) per gallon of material, for each material used at the facility.When using the SDS or MSDS as the basis of this determination, the Permittee can assume that PM consists entirely of PM less than 2.5 microns, meaning PM=PM10=PM2.5.The Permittee may choose to assume that any or all materials used at their facility consist of 100% Solids/Particulate Matter, as long as the Permittee can remain under the limits of the permit while using that assumption. If a material is assumed to be 100% Solids, then the Solids content is the density of the material in lbs/gallon.For some material processing operations (blasting, sanding, grinding etc.) the material used or processed may be 100% Solids/Particulate Matter.Considerations for VOC ContentsEach month, identify the Volatile Organic Compound (also known as V.O.C. or VOC) contents in coating materials and other material-usage operations in lbs of VOC per gallon of material, for each material used at the facility.The Permittee may choose to assume that any or all materials used at their facility consist of 100% VOC, as long as the Permittee can remain under the limits of the permit while using that assumption. If a material is assumed to be 100% VOC, then the VOC content is the density of the material in lbs/gallon.Considerations for HAP ContentsFor each month in which the Permittee determines that the 12-month sum of the VOC emissions is less than the single HAP limit (5 tons based on a 12-month rolling sum) as calculated in Section 3.4, the Permittee can choose to assume that the 12-month sum of the Total HAP and Single HAP emissions are also 5 tons. For that month the Total and Single HAP emissions calculation is not required.For each month in which the Permittee determines that the 12-month sum of the VOC emission is greater than 5 tons, the Permittee must determine the HAP content and calculate the HAP emissions as indicated below.For each month that the calculation is required, identify each individual Hazardous Air Pollutant (also known as HAP) content in each coating material or other material. Record the name of each individual HAP (such as toluene, xylene, ethyl benzene etc.) and the contents of that HAP in lbs of HAP per gallon of material, for each material used at the facility.A.3.3 PM/PM10/PM2.5 Emissions Based on a 12-month rolling sumSTEP 1: Calculation of Solids/Particulate Matter Used each Month (Solids Usage)The Permittee shall calculate the total amount of Solids used or processed during a calendar month using records of hourly usage rate, daily material usage, hours of operations, purchase records, or any combination of methods as identified in the permit application or Compliance Management Plan. Depending on the calculation basis previously identified, the Permittee may use one or more of the following example calculation methods, or a similar method, to determine monthly usage in lbs Solids/month. Method 1 and 2 may be more useful for coating operations where the solids content in lbs/gallon is known. Methods 3 and 4 may be more useful for operations where a 100% Solids material is used, such as in abrasive blasting, and the weight of the material used or purchased hourly or daily is known.Method 1: Solids Usage (S) based on hourly usage rate (such as spray gun capacity), hours of operation, and SDS/MSDSS=A×B×CWhere:S= Solids Usage in lbs Solids/monthA = rate of material usage (i.e. spray gun capacity) in gallons/hourB = solids content of material from SDS or MSDS, as identified in Section A.3.2 (lb Solids/gallon of material)C = actual hours of operation for the previous monthMethod 2: Solids Usage based on gallons of material used or purchased each day, days of operation, and SDS/MSDSS=A×B×CWhere:S= Solids Usage in lbs Solids/monthA = average gallons of material used or purchased per dayB = solids content of material from SDS or MSDS, as identified in Section A.3.2 (lbs solids/gallon of material)C = actual days of operation for the previous month Method 3: Material Usage based on hourly usage or processing, hours of operation, and an Emission Factor (EF)S=A×EF×CWhere:S= Solids Usage in lbs Solids/monthA = lb of material (i.e. abrasive) used per hourEF = Emission Factor (lb PM/lb material) identified in permit application or Compliance Management Plan (see Table A.3.1 below for abrasive blasting EFs). The emission factors for PM, PM10and PM2.5 may be pollutant specific.C = actual hours of operation for the previous monthMethod 4: Solids Usage based on material used or purchased each day, days of operation, and an Emission Factor (EF)S=A×EF×CWhere:S= Solids Usage in lbs Solids/monthA = lb of material (i.e. abrasive) used or purchased per dayEF = Emission Factor (lb PM/lb material) identified in permit application or Compliance Plan (see Table A.3.1 below for abrasive blasting Emission Factors)C = actual days of operation for the previous monthTable A.3.1Emission FactorAbrasivelb PM / lb abrasivelb PM10 /lb abrasiveSand0.0410.029Grit0.0100.0070Steel Shot0.0040.0034Other0.0100.00010Emissions factors for PM/PM10/PM2.5 emissions from abrasive blasting obtained from Volume I of STAPPA-ALAPCO "Air Quality Permits". PM2.5 is assumed to be equivalent to PM10.STEP 2: Identify Transfer Efficiency and Overall Control Efficiency as applicableTransfer EfficiencySelect a Transfer Efficiency if one of the application methods in Table A.3.2 is used. These are the transfer efficiencies allowed by this permit for these application methods. Alternatively, the Permittee may choose to use a transfer efficiency of zero, as long as the Permittee can remain under the limits of the permit while using that assumption. For operations not identified in Table A.3.2, transfer efficiency is assumed to be zero. Table A.3.2Application MethodTransfer EfficiencyAir atomization sprayNot allowedAirless spray0.45Electrostatic/Air atomization0.70Electrostatic/Airless0.75High Volume Low Pressure0.75Electrode deposition0.95Powder0.95Overall Control EfficiencyCalculate the Overall Control Efficiency for PM/PM10/PM2.5. This calculation shall be used as indicated in your Compliance Management Plan, if applicable. Considerations for Overall Control Efficiency:The Permittee may choose to use an Overall Control Efficiency of zero, as long as the Permittee can remain under the limits of the permit while using that assumption.For operations that do not use control equipment, the Overall Control Efficiency is zero.For operations that are totally enclosed as defined in Section A of this permit, the Capture Efficiency (C) is 100%.For operations that are not totally enclosed, but are certified according to Minn. R. 7011.0072, the Capture Efficiency (C) is 80%.For operations that are not totally enclosed, and are not certified according to Minn. R. 7011.0072, the Overall Control Efficiency is zero.The Collection or Destruction Efficiency (D) used in this equation will depend on the type of control equipment used.The Control or Destruction Efficiency (D) for PM/PM10/PM2.5 as controlled by different types of control equipment are listed Minn. R. 7011.0070 and Section A of this permit.Note: If the Permittee accounts for control for PM then the PM, PM10, and PM2.5 emissions must be determined separately from this point on, since there are different control efficiencies for each type of particulate matter.Overall Control Efficiency (%)=C×DWhere:C= Capture efficiency (% capture). D= Collection or Destruction efficiency (%Collection or %Destruction). STEP 3: Calculate lb of Particulate Matter (PM/PM10/PM2.5) per monthThis equation gives PM/PM10/PM2.5 emitted in lbs/month using the Solids/month (S) identified in STEP 1, and taking into account any transfer efficiency or control efficiency identified in STEP 2.Monthly Emissions=S×1-Transfer Efficiency × 100-(Overall Control Efficiency)100Where:Monthly Emissions= Particulate Matter (PM/PM10/PM2.5) emissions in lbs/monthS = lbs Solids/month as determined in STEP 1Transfer Efficiency= Transfer Efficiency as identified in STEP 2 (this may be zero)Overall Control Efficiency= % Overall Control Efficiency as identified in STEP 2 (this may be zero)STEP 4: Determine the Total Monthly EmissionsIf more than one Solids-emitting process, or materials with different solids contents, are used at the facility, and consequently more than one method was used to determined monthly emissions, at this point the monthly emission from each process or material should be summed to determine the Total monthly PM/PM10/PM2.5 emissions. If PM, PM10, and PM2.5 are not considered to be equal, then a total monthly emissions should be calculated separately for PM, PM10, and PM2.5.STEP 5: Identify Material Shipped as Waste, as applicableThe Permittee may elect to obtain credit for solids shipped in waste materials by one of the following methods:The Permittee may analyze a composite sample of each waste shipment to determine the weight content of Solids in lbs/gallon.The Permittee may use supplier data for raw materials to determine the solids content of each waste shipment, using the same content data used to determine the content of raw materials. If the waste contains several materials, the content of mixed waste shall be assumed to be the lowest solids content of any of the materials.Once Solids content is identified, use a calculation method to determine waste (W) in lbs Solids/month.For example:W=X×YWhere:W = Waste shipped in lbs Solids/monthX = Solids content of the waste in lbs Solids/gallonY = Total amount of waste, in gallons, shipped that monthSTEP 6: Calculate tons Particulate Matter (PM/PM10/PM2.5) per monthPM=T-W×0.0005Where:PM= Emission of Particulate Matter (PM/PM10/PM2.5) in tons/monthT= Total monthly emission of Particulate Matter in lb/month as determined in STEP 4W= waste shipped in lbs Solids/month as determined in STEP 5 (if no waste credit is taken, this will be zero)0.0005 = conversion factor; ton/pounds (ton/lbs)STEP 7: Calculate the 12-month rolling sum of Particulate MatterEach month, the Permittee shall calculate the 12-month rolling sum PM/PM10/PM2.5 emissions for the previous 12-month period by summing the monthly PM emissions data, as calculated in STEP 6, for the previous 12 months.A.3.4 VOC Emissions Based on a 12-month rolling sumSTEP 1: Calculation of Volatile Organic Carbon (VOC) Used Each MonthThe Permittee shall calculate the total amount of VOCs used or processed during a calendar month using records of hourly usage rate, daily material usage, hours of operations, purchase records, or any combination of methods as identified in the permit application or Compliance Management Plan. Depending on the calculation basis previously identified, the Permittee may use one or more of the following example calculation methods, or a similar method, to determine monthly usage in lbs VOC/month. Method 1: VOC Usage (V) based on hourly usage rate (such as spray gun capacity), hours of operation, and SDS/MSDSV=A×B×CWhere:V= VOC Usage in lbs VOC/monthA = rate of VOC-containing material usage (i.e. spray gun capacity) in gallons/hourB = VOC content of material from SDS or MSDS, as identified in Section A.3.2 (lb VOC/gallon of material)C = actual hours of operation for the previous monthMethod 2: VOC Usage based on gallons of material used or purchased each day, days of operation, and SDS/MSDSV=A×B×CWhere:V= VOC usage in lbs VOC/monthA = average gallons of VOC-containing material used or purchased per dayB = VOC content of material from SDS or MSDS, as identified in Section A.3.2 (lbs VOC/gallon of material)C = actual days of operation for the previous month STEP 2: Identify the Overall Control Efficiency as applicableOverall Control EfficiencyCalculate the Overall Control Efficiency for VOCs. This calculation shall be used as indicated in your Compliance Management Plan, if applicable. Considerations for Overall Control Efficiency:The Permittee may choose to use an Overall Control Efficiency of zero, as long as the Permittee can remain under the limits of the permit while using that assumption.For operations that do not use control equipment, the Overall Control Efficiency is zero.For operations that are totally enclosed as defined in Section A of this permit, the Capture Efficiency (C) is 100%.For operations that are not totally enclosed, but are certified according to Minn. R. 7011.0072, the Capture Efficiency (C) is 80%.For operations that are not totally enclosed, and are not certified according to Minn. R. 7011.0072, the Overall Control Efficiency is zero.The Collection or Destruction Efficiency (D) used in this equation will depend on the type of control equipment used.The Control or Destruction Efficiency (D) for VOCs is 94% for a catalytic afterburner and 97% for a thermal oxidizer.Overall Control Efficiency (%)=C×DWhere:C= Capture efficiency (% capture). D= Collection or Destruction efficiency (%Collection or %Destruction). STEP 3: Calculate lb of VOC emissions per monthThis equation gives VOC emitted in lbs/month using the lb VOC/month (V) identified in STEP 1, and taking into account any control efficiency identified in STEP 2.Monthly Emissions=V× 100-(Overall Control Efficiency)100Where:Monthly Emissions= VOC emissions in lb VOC/monthV = lbs VOC/month as determined in STEP 1Overall Control Efficiency= % Overall Control Efficiency as identified in STEP 2 (this may be zero)STEP 4: Determine the Total Monthly EmissionsIf more than one VOC-emitting process, or materials with different VOC contents, are used at the facility, and consequently more than one method was used to determined monthly emissions, at this point the monthly emission from each process or material should be summed to determine the Total monthly VOC emissions. STEP 5: Identify Material Shipped as Waste, as applicableThe Permittee may elect to obtain credit for VOCs shipped in waste materials by one of the following methods:The Permittee may analyze a composite sample of each waste shipment to determine the weight content of VOCs in lbs/gallon.The Permittee may use supplier data for raw materials to determine the VOC content of each waste shipment, using the same content data used to determine the content of raw materials. If the waste contains several materials, the content of mixed waste shall be assumed to be the lowest VOC content of any of the materials.Once VOC content of the waste is identified, use a calculation method to determine waste (W) in lbs VOC/month.For example:W=X×YWhere:W = Waste shipped in lbs VOC/monthX = VOC content of the waste in lbs VOC/gallonY = Total amount of waste, in gallons, shipped that monthSTEP 6: Calculate tons VOC per monthVOC=T-W×0.0005Where:VOC= Emission of VOC in tons/monthT= Total monthly emission of VOCs in lbs VOC/month as determined in STEP 4W= waste shipped in lbs VOC/month as determined in STEP 5 (if no waste credit is taken, this will be zero)0.0005 = conversion factor; ton/pounds (ton/lbs)STEP 7: Calculate the 12-month rolling sum of VOCEach month, the Permittee shall calculate the 12-month rolling sum VOC emissions for the previous 12-month period by summing the monthly VOC emissions data, as calculated in STEP 6, for the previous 12 months.A.3.5 HAP Emissions Based on a 12-month rolling sumSTEP 1: Calculation of HAP Used each MonthThe Permittee shall calculate the amount of each individual HAPs used or processed during a calendar month using records of hourly usage rate, daily material usage, hours of operations, purchase records, or any combination of methods as identified in the permit application or Compliance Management Plan. The Permittee may use an emissions factor. The Permittee may calculate an organic HAP emission factor based on the equations in Table 1 to 40 CFR pt. 63, subp. WWWW if applicable, or the Permittee may use any organic HAP emissions factor approved by US EPA, such as factors from AP–42, or site-specific organic HAP emissions factors if approved by the MPCA. Depending on the calculation basis previously identified, the Permittee may use one or more of the following example calculation methods, or a similar method, to determine monthly usage in lbs HAP/month. Method 1 and 2 may be more useful for coating operations where the HAP content in lbs/gallon is known. Methods 3 and 4 may be more useful for operations where an emission factor can be used, such as in open molding or centrifugal casting operations, and the weight of the material used or purchased hourly or daily is known.The monthly emissions must be determined individually for each type of HAP used. Method 1: HAP Usage (H) based on hourly usage rate (such as spray gun capacity), hours of operation, and SDS/MSDSH=A×B×CWhere:H= HAP Usage in lbs HAP/monthA = rate of material usage (i.e. spray gun capacity) in gallons/hourB = HAP content of material from SDS or MSDS, as identified in Section 3.2 (lb HAP/gallon of material)C = actual hours of operation for the previous monthMethod 2: HAP Usage based on gallons of material used or purchased each day, days of operation, and SDS/MSDSH=A×B×CWhere:H= HAP Usage in lbs HAP/monthA = average gallons of material used or purchased per dayB = HAP content of material from SDS or MSDS, as identified in Section 3.2 (lb HAP/gallon of material)C = actual days of operation for the previous month Method 3: HAP Usage based on lbs of material processed per hour, hours of operation, and an Emission Factor (EF) in lb HAP per lb of materialH=A×EF×CWhere:H= HAP Usage in lbs HAP/monthA = lb of material (i.e. resin or coating) used per hourEF = Emission Factor in lb HAP/lb material identified in permit application or Compliance Management Plan C = actual hours of operation for the previous monthMethod 4: HAP Usage based on tons of material processed per hour, hours of operation, and an Emission Factor (EF) in lbs HAP per ton of materialH=A×EFWhere:H= HAP Usage in lbs HAP/monthA = tons of material (i.e. resin or coating) used in the previous monthEF = Emission Factor in lb HAP/ton material as identified in permit application or Compliance Management Plan STEP 2: Identify the Control Efficiency as applicableNote: If the facility has a catalytic afterburner or thermal oxidizer and has HAPs that are VOCs, then the Permittee may account for control and use the same control efficiencies and equation as for VOCs in the previous section.STEP 3: Calculate lb of HAP emissions per monthThis equation gives HAP emitted in lbs/month using the lb HAP/month (H) identified in STEP 1, and taking into account any control efficiency identified in STEP 2. This should be calculated for each type of HAP used at the source.Monthly Emissions=H×100-(Overall Control Efficiency)100Where:Monthly Emissions= HAP emissions in lb HAP/monthH = lbs HAP/month as determined in STEP 1Control Efficiency= Control Efficiency as identified in STEP 2 (this may be zero)STEP 4: Identify Material Shipped as Waste, as applicableThe Permittee can choose to take credit for HAPs shipped in waste materials. This can be done for each Individual HAP, for Total HAPs only, or for both. If credit is taken the amount of HAPs shipped in waste materials must be determined by one of the following methods:The Permittee may analyze a composite sample of each waste shipment to determine the weight content of HAPs in lbs/gallon (each individual HAP in lbs/gallon, or Total HAP in lb/gallon).The Permittee may use supplier data for raw materials to determine the (Total or Individual) HAP content of each waste shipment, using the same content data used to determine the content of raw materials. If the waste contains several materials, the content of mixed waste shall be assumed to be the lowest HAP content of any of the materials. Once HAP content of the waste is identified, use a calculation method to determine waste (W) in lbs HAP/month.For example:W=X×YWhere:W = Waste shipped in lbs HAP/monthX = Total or Individual HAP content of the waste in lbs HAP/gallonY = Total amount of waste, in gallons, shipped that monthSTEP 5: Calculate the sum of Total and Individual HAPs emitted per month in lb HAP/monthIndividual (Single) HAP:At this point the Permittee should sum up the total amount of each type of HAP used in different processes, or from different material. For example, if two different coating materials were used in the same month for the same process, but in different amounts, and both materials contain Ethylbenzene, then the total amount of Ethylbenzene used during the month will be the sum of the lb/month calculated previously from each material.Total HAP:At this point the Permittee should sum up the Total HAP emitted in lb Total HAP/month. This is the sum of all Individual HAPs emitted from all the different processes and materials at the source.STEP 6: Calculate tons Total and Individual HAP emitted per monthThis should be calculated separately for each type of HAP, and for Total HAPs.HAP=T-W×0.0005Where:HAP= Emissions of Total or Individual HAP in tons/monthT= Total monthly emission of Total or Individual HAP in lb HAP/month as determined in STEP 5W= waste shipped in lbs HAP/month as determined in STEP 4 (if no waste credit is taken, this will be zero)0.0005 = conversion factor; ton/pounds (ton/lbs)STEP 7: Calculate the 12-month rolling sum of Total and Individual (Single) HAPEach month, the Permittee shall calculate the 12-month rolling sum HAP emissions for the previous 12-month period by summing the monthly HAP emissions data, as calculated in STEP 6, for the previous 12 months. To determine compliance with the Single HAP limit (5 tons/year) the Permittee shall use the highest number from the Individual HAP (the type of HAP that had the greatest emissions in the 12-month period) to compare to the limit. ................
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