William C. Herz Vice President, Scientific Programs

Capitol View 202.962.0490 425 Third Street, S.W., Suite 950 202.962.0577 fax Washington, DC 20024 www.tfi.org 

## March 28, 2012

VIA U.S. MAIL and ELECTRONIC MAIL

Mr. Bill Neuffer Environmental Engineer U.S. Environmental Protection Agency Sector Policies and Programs Division Mail Code: D243-02 Research Triangle Park, NC 27711 neuffer.bill@epa.gov

Re: New Source Performance Standards for Nitric Acid Plants

Dear Bill:

On behalf of The Fertilizer Institute (“TFI”), we want to thank you and others at the U.S. Environmental Protection Agency (“EPA” or “Agency”) for meeting with us on March 15, 2012, to discuss the Agency’s proposed rule entitled New Source Performance Standards for Nitric Acid Plants

, 1 

## appearing at 76 Fed. Reg. 63878 (Oct. 14, 2011). As you are aware, TFI submitted comments on this rulemaking and TFI and its memb ers have a substantial interest in EPA’s development of the final rule. 2 

## During our meeting, EPA requested four items from TFI and its members: (1) a definition of extended absorp tion; (2) any additional continuous emissions monitoring system (“CEMS”) data that TFI members may possess for nitric acid plants (“NAPs”); (3) a discussion of nonselective catalytic reduction (“NSCR”); and, (4) any support for the subcategorization of NAPs in the final New Source Performance Standards for Nitric Acid Plants based on prior EPA rulemakings. TF I responds to EPA’s requests below. 3



## I. Definition of Extended Absorption

As EPA is aware, the production of nitric acid is basica lly a three step process. First, anhydrous ammonia is oxidized over a cata lyst (typically platinum-rhodium gauze) to product nitrous oxide

1 

### Hereinafter referred to as “ Nitric Acid NSPS Proposal .”

2 

### Letter from Bill Herz, TFI, to EPA Docket Center (Nov. 28, 2011) (EPA-HQ-OAR-2010-0750-0098) (hereinafter referred to as “TFI Comments”); Letter from Bill Herz, TFI, to EPA Docket Center (Feb. 22, 2012) (EPA-HQ-OAR-2010-0750-0120).

3 

### We also request that EPA place th is letter in the rulemaking docket.

## Mr. Bill Neuffer U.S. Environmental Protection Agency March 28, 2012 Page 2

3006135v2/21436-0021 

## and water. Second, the nitrous ox ide formed from the first step is cooled in a cooler/condenser apparatus, where it is reacted with oxygen to form nitrogen dioxide a nd dinitrogen tetroxide. Third, the nitrogen dioxide and dinitrogen tetroxide ar e absorbed in water to form nitric acid and NO x 

## . This absorption takes place in a stainles s steel absorption towe r containing numerous bubble cap or sieve trays. The number of trays vary according to the design pressure, acid strength, gas composition, and operating temperature.

“Extended” absorption reduces NO x 

## emissions by increasing the absorption efficiency in the production process. Extended absorption typically means a single large towe r or the addition of a second absorption tower in series with the fi rst absorption tower. As noted by EPA, although extended absorption (either thr ough a larger absorption tower or a second absorption tower) results in more NO x 

## being recovered to produce nitric acid (approximately 1 to 1.5 percent more nitric acid), the principa l purpose of the extended absorption tower is to reduce NO x 

## emission levels (typically 100 ppm). 4 

## Consistent with this rec ognition, EPA identifies extended absorption as a pollution control technique for NO x 

## . 5



## The gas off the extended absorption unit is sent to a series of heat exchangers and, from there, typically to a NO x 

## pollution control device. The “larger” the extended absorption unit, the more NO x 

## reduction up-stream of the pollution control device and, consequently, the lower the NO x 

## concentration entering the po llution control device.

As noted in TFI’s comments on the Nitric Acid NSPS Proposal , the El Dorado Nitrogen and PCS Geismar Train 5 extended absorption units are la rger than typical in the industry, which means that the outlet NO x 

## concentrations from their extended ab sorption units to the pollution control devices are lower than typical. 6 

## This results in lower NO x 

## concentrations exiting the SCR pollution control device on each NAP. 7



## II. Additional CEMS Data

EPA asked TFI if its members with CEMS on th eir NAPs would be willing to share the CEMS data with the Agency. In the time period a llotted TFI by EPA to provi de such data to the

4 

### See EPA, Alternative Control Techniques Document – Nitric and Adipic Acid Manufacturing Plants at 5-2 (Dec. 1991) (hereinafter “ Alternative Control ”).

5 

### Id. at 5-1–5-6.

6 

### For example, the El Dorado Nitrogen selective catalytic reduction (“SCR”) device has an inlet NO x 

### concentration of about 300 to 800 ppm NO x 

### , which is not typical, particularly for older NAPs which have an inlet concentration in the range of 1,500 to 2,000 ppm NO x 

### . See TFI Comments at 11. EPA recognized that the size of the extended absorption tower is a factor relevant to the NO x 

### concentration exiting the tower. See Alternative Control at 5-5 (stating that the factors leading to reduced NO x 

### concentrations exiting an extended absorption tower include the residence time in the tower – that is, the larger the tower, the longer the residence time and, as a result, the lower the exiting NO x 

### concentration).

7 

### In addition, these test plants have unique capabilities that allow either the SCR device to remain on during startup and shutdown (El Dorado Nitrogen, due to an unlimited steam supply) or the SCR to obtain optimum operating temperature sooner (PCS Geismar Train 5, due to a steam heater upstream of th e SCR that is used during startup). See TFI Comments at 11.

## Mr. Bill Neuffer U.S. Environmental Protection Agency March 28, 2012 Page 3

3006135v2/21436-0021 

## Agency, we have received 2010–2011 monitoring data from Agrium U.S. Inc. (“Agrium”) for its West Sacramento NAP, which are included as Enclosures A and B. We will forward any additional data we receive from members to EPA upon receipt.

The Agrium West Sacramento NAP was origin ally constructed in 1982 and has NSCR for NO x 

## pollution abatement. This NAP was one of EPA’s test plants in the Nitric Acid NSPS Proposal

. 8 

## The West Sacramento NAP does not ha ve extended absorption. In the Nitric Acid NSPS Proposal , EPA concluded that the NO x 

## 99th percentile, 30-day rolling average for this NAP is 1.29 lb/ton. 9



## Using the recent Agrium data, and EPA’s methodology for the Nitric Acid NSPS Proposal , we calculated a 99th percentile , 30-day rolling average for this NAP of 1.53 lb/ton NO x 

## . This result, based on more recent CEMS data, is higher than EPA’s reported 1.29 lb/ton for this NAP. In addition, the Agrium NAP, as is the case with the majority of TFI members’ NAPs, utilizes a single span NO x 

## monitor, which peaks at 500 ppm. Because startup and shutdown events at NAPs result in NO x 

## emissions in the range of 2,000–5,000 ppm, the 99th percentile, 30-day rolling average would be higher if the NO x 

## emissions during start up and shutdown were monitored using a dual span monitor. 10



## The Agrium West Sacramento NAP data furthe r confirm that an exis ting NAP with NSCR will not be able to meet the proposed 0.5 lb/ton NO x 

## standard. Further, the lack of a dual span monitor for this NAP undercuts EPA’s Nitric Acid NSPS Proposal because, under the proposal, NAPs are required to measure emissions at all tim es (including startup and shutdown), and such emissions are factored into compliance. Because EPA’s assumption capped startup and shutdown emissions at 500 ppm (due to the limita tions of CEMS as calibrated under Subpart G), EPA’s proposed NSPS does not accurately account for actual startup and shutdown emissions.

III. NSCR Discussion

The NSCR process involves the non-selective ca talytic reduction of NO x 

## to nitrogen using a catalyst. As the process is non-se lective, the oxygen in the tail ga s needs to be combusted before the NO x 

## reduction can take place. This results in a substantial generation of heat in the process, which is then recovered. NAPs utilizing NS CR technology are integrated so that optimum utilization of heat generated in the process is achieved. The heat is recovered through steam generation, tail gas reheating, water heating, etc., utilizing a number of heat exchangers within the process battery limits . In addition to the NO x 

## reduction, the NSCR process offers several advantages:

 

## The exothermic reaction heat generated duri ng the NSCR process is typically used for driving the air compressor (through a tail ga s expander). Approximately 70-90% of the

8 

### 76 Fed. Reg. at 63,882.

9 

### Id.

10 

### See TFI Comments at 18.

## Mr. Bill Neuffer U.S. Environmental Protection Agency March 28, 2012 Page 4

3006135v2/21436-0021 

## horsepower requirement of the air compressor is met in this manner. The air compressor is the single largest power consumer in the process. Alternate technologies may need supplemental power to be provided through an electric motor or steam turbine.

 

## Additional heat recove ry from tail gas is possible th rough the use of boiler/economizer systems. Optimum steam recovery is critic al for the site steam balance and, if not optimized, may need to be supplemented th rough generation of st eam from auxiliary boilers.

 

## The reaction taking place in the nitric acid pr ocess is highly exothermic, and part of the heat generated is utilized for preheating th e tail gas to the minimum temperature needed for reaction in the NSCR process. An alte rnate process may require significant changes to the heat train, resulting in higher capital costs.

 

## A significant amount of N 2 

## O generated upstream is de stroyed during the reduction process (typically in the 70-80% range).

During our meeting, we discussed NAPs with NSCR and how these NAPs would have difficulty meeting the proposed 0.50 lb/ton NO x 

## standard, based on a 30-day rolling average. 11 

## Indeed, EPA expressed uncertainty in the Nitric Acid NSPS Proposal preamble about whether the proposed standard would be achievable for these NAPs, 12 

## a fundamental requirement for setting a NSPS. 13 

## Based on this uncertainly, TFI advocated in its comments that EPA set a separate NO x 

## emission limit for existing NSCR-controlle d NAPs that undergo a modification or reconstruction. 14



## There are several advantages inherent with NSCR-controlled NAPs that may no longer be present if the installation of SCR is required for a modified/r econstructed NSCR-controlled NAP to meet the proposed standard. NSCR is built into, and is an integral part of, the operation of the NAP, particularly in terms of heat balance and energy generation for other parts of the NAP. As such, NAPs with an NSCR must keep temperatures elevated in order to create the reductive environment within the unit that eliminates both NO x 

## and N 2 

## O. In order to ensure that temperatures and pressures are adequate for th is reductive environment, the NSCR is placed upstream of the tail gas expander. These expanders will malfunction above the temperatures they are designed to handle, and because NS CR reactions are extremely exothermic, any increased NO x 

## destruction and associated temperature in creases related thereto could cripple the expander and, thus, the entire NAP. Attempting to switch to alternate technologies, or the

11 

### The proposed standard is based on the identification of SCR as the best demonstrated technology. 76 Fed. Reg. at 63,881.

12 

### Id. at 63,882 (emphasis added) (“Whether NSCR can meet the levels achievable by SCR over a long term, is uncertain. . . . These data ar e presented to show that NSCR may be able to achieve the proposed emission limit.”).

13 

### Section 111 of the Clean Air Act (“CAA”) require s that a NSPS “reflect[] the degree of emission limitations achievable . . .”, not the degree of emission limitations that may be achievable. 42 U.S.C. § 7411(a)(1).

14 

### See TFI Comments at 23.

## Mr. Bill Neuffer U.S. Environmental Protection Agency March 28, 2012 Page 5

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## insertion of additional abatement technologies, can have a significant impact on capital cost as a result of modifications/add ition to the heat trains. 15 

## Other NAPs do not face these conditions, limitations, or the inability to modify their ope rations, or their attendant impact on emissions. 16 

## In addition, there may be footprint issues associat ed with the installation of SCR at an existing NSCR-controlled NAP.

IV. Precedent for Subcategorization of the Nitric Acid Source Category

In our comments, TFI advocated for subcateg orization of NAPs, particularly: (1) a NO x 

## standard for new NAPs; (2) a NO x 

## standard for existing NAPs wit hout NSCR that undergo a modification or reconstruction; and, (3) a NO x 

## standard for existing NAP s with NSCR that undergo a modification or reconstruction. Based on our re view of CAA § 111, relevant case law, other EPA NSPS, as well as certain National Emissi on Standards for Hazardous Air Pollutants, we believe that ample precedent exists for such an approach.

CAA § 111 directs EPA to set NSPS for categories of stationary sources. 17 

## In doing so, it requires EPA to weigh the cost, energy requireme nts, environmental impacts, and any nonair quality health impacts re lated to such standards. 18 

## It also authorizes EPA to “distinguish among classes, types, and size s within categories of new sources for the purpose of establishing such standards.” 19 

## EPA has long interpreted its authority under Section 111 to permit it to set nonuniform NSPS for facilities within a source category; that is, to set different NSPS for subcategories of facilities within a source category. 20 

## The Sierra Club v. Costle case is instructive. 21



## In 1979, EPA promulgated sulfur dioxide (“SO 2 

## ”) and particulate matte r NSPS for coal-fired electric power plants. The SO 2 

## standard was variable in that it limited emissions to 1.2 lbs/MBtu and no less than a 90% reduction of potential uncontrolled SO 2 

## emissions, except when emissions were below 0.60 lbs./Mbtu after institut ing control measures. When emissions were below 0.60 lbs./MBtu, a plant was only required to reduce potential uncontrolled emissions by no less than 70%. 22 

## The variable standard was created, among other reasons, to account for the

15 

### The capital costs associated with modifications to the heat train for a modified NSCR-controlled NAP have not been examined by EPA.

16 

### See TFI Comments at 12–13.

17 

### 42 U.S.C. § 7411(b)(1)(A)–(B).

18 

### Id . § 7411(a)(1).

19 

### Id . § 7411(b)(2). Like CAA § 111, Section 112, which requires EPA to set standards for the emission of hazardous air pollutants from st ationary sources, also allows EPA to distinguish among cl asses, types, and sizes of sources within categories. 42 U.S.C. § 7412(d)(1); see also id. § 7429(a)(1)–(2) (directing EPA to categorize and set NSPS for each category of solid waste incineration units and authorizing EPA to distinguish among classes, types, and sizes of units with in each category).

20 

### Sierra Club v. Costle , 657 F.2d 298, 318–319 (D.C. Cir. 1981); see also Lignite Energy Council v. EPA

, 198 F.3d 930, 933 (D.C. Cir. 1999) (noting that in 1979 EP A subcategorized utility boilers based on boiler type and fuel type and set a range of NSPS for NO x 

### ).

21 

### 657 F.2d 298 (D.C. Cir. 1981).

22 

### Id . at 312, 317.

## Mr. Bill Neuffer U.S. Environmental Protection Agency March 28, 2012 Page 6

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## varying amounts of sulfur in coal used as fuel for these plants across the country, as well as differences in emission controls ( i.e ., wet and dry scrubbing). 23



## Sierra Club challenged the variable NSPS, asser ting that EPA did not ha ve the authority under Section 111 to create a non-uniform standard with in a source category. The court rejected this argument, holding that CAA § 111 provides “on its face that EPA does not have to set a uniform percentage reduction requirement for an entire category of emission sources.” 24 

## The fact that Congress required EPA to consider and balance costs, environmental, and energy factors when setting an NSPS means that Congress “surely coul d not have meant to bind [EPA] to issuance of a uniform standard.” 25



## More recently, EPA explained its authority and discretion to subcategorize within a source category under Section 111 in a mercury NSPS fo r electric utility st eam generating units. 26 

## In that rule, EPA established five subcategories of boilers based on coal rank and process type. 27 

## In doing so, EPA explained that under Section 111 it “* * * has the discretion to ‘distinguish among classes, types, and size s within categories of new sources * * *’ in establishing standards when differences between given types of sources within a category le ad to corresponding differences in the nature of emissions and the technical feasibility of apply ing emission control techniques .” 28 

## Thus, for example, in addition to categorizing u tility boilers based on coal rank (or fuel input) and process type, it has also s ubcategorized source categories based on facilities’ capacities. 29



## EPA’s 2005 mercury NSPS for boilers was vacated by the D.C. Circuit in connection with another rulemaking for reasons wholly unrelated to subcategorization. 30 

## Nevertheless, in February 2012, EPA further expounded upon its au thority to subcategorize under CAA § 111, as well as CAA § 112, and consistent with its prior s ubcategorizations, stated that subcategorization is appropriate when the differences among the s ources lead to a difference in the nature of emissions and the feasibility of applying a control technique. 31 

## In this recent rule, EPA determined that continuing to subcategorize util ity boilers based on coal rank and process type was appropriate.

23 

### Id . at 327–328.

24 

### Id. at 318.

25 

### Id . at 318–319 (the language of CAA § 111 “neither imposes a single, nationally uniform standard nor prohibits EPA from varying the standard”); s ee also id. at 319 - 322 (finding that interpreting CAA § 111 to permit EPA to promulgate non-uniform standards within a source category is not inconsistent with the remainder of the CAA, or its legislative history).

26 

### 70 Fed. Reg. 28,606 (May 18, 2005).

27 

### Id . at 28,612.

28 

### Id. (quoting 42 U.S.C. § 7411(b)(1)) (emphasis added).

29 

### See

, e.g. , 40 C.F.R. § 60.1045 (dividing small municipal waste combustion units into subcategories based on capacity).

30 

### 77 Fed. Reg. 9,304, 9,308 (Feb. 16, 2012).

31 

### Id. at 9,378–9,379 (citing Sierra Club

, supra ).

## Mr. Bill Neuffer U.S. Environmental Protection Agency March 28, 2012 Page 7

3006135v2/21436-0021 

## In sum, ample authority and precedent exists for EPA to subcategorize NAPs within that source category, and to provide non-uniform NSPS for the subcategories. Fu rther, as set forth in TFI’s comments, and as discussed in the March 15, 201 2, meeting, TFI believes that subcategorization of the NAP source category is appropriate give n the great variability in conditions at NAPs, which, in turn, substantially impacts the tech nical feasibility of applying emission control techniques to meet a uniform standard (particula rly when that standard is based on test plants that are not representa tive of the industry). 32



## Unlike the test plants discussed in the Nitric Acid NSPS Proposal , many NAPs used NSCR as an emission control unit. In Section III of this letter, we described the nature of NSCR and why it is an integral part of the NAP, and its operation, pa rticularly in terms of heat balance and energy generation for other parts of the NAP. Other NAPs do not face these conditions, limitations, or the inability to modify their operations, or their attendant impacts on emissions. 33 

## Existing, nonNSCR NAPs also face similar technical issues re lated to meeting a uniform standard due to design capacity/size, extended absorption use and size, and the lack of multiple emissions controls and/or design capabiliti es that eliminate inefficient operations (such as startup, shut down, and maintenance periods), unlike EPA’s test plants. 34



## Given the foregoing, TFI continues to recommend that EPA establish NO x 

## standards for three subcategories of NAPs: (1) a NO x 

## standard for new NAPs; (2) a NO x 

## standard for existing NAPs without NSCR that undergo a modificati on or reconstruction; and, (3) a NO x 

## standard for existing NAPs with NSCR that undergo a modification or reconstruction

Conclusion

TFI is pleased to provide this information to EPA. Should you ha ve any questions regarding our submission, please call me at (202) 515-2706.

Sincerely yours,

William C. Herz Vice President, Scientific Programs

Enclosures

32 

### See TFI Comments at 9–13, 23–24 (specifically noting th at the types of catalysts, fuels, or other raw materials ( e.g ., fuel for NSCR), design capacity/size, pressure (single or dual), pressure rating (low, medium, or high), use of extended absorption, age, and emission control system(s ) currently employed ( e.g ., SCR, NSCR, or hydrogen peroxide injection), all impact the emissions reductions achievable by a NAP).

33 

### See id . at 12–13.

34 

### See id . at 10–11.Date Daily Avg lbNOx/tHNO3 30

‐ Op Day Avg (lbNOx/tHNO3) 365

‐ Op Day Avg (lbNOx/tHNO3) Percentile 30

‐ Op Day Avg (lbNOx/tHNO3) 365

‐ Op Day Avg (lbNOx/tHNO3) 1/1/2010 0.865921165 0.89205836 0.938603243 5% 0.7670926 0.889109807 1/2/2010 0.638662595 0.891419504 0.938205465 10% 0.7796570 0.89487541 1/3/2010 1.051331209 0.902148529 0.938334594 15% 0.8080516 0.897379834 1/4/2010 1.18371812 0.912477921 0.937983698 20% 0.8274905 0.898525637 1/5/2010 1.006791162 0.898544176 0.93710875 25% 0.8466671 0.899286898 1/6/2010 0.872634771 0.898677979 0.93671969 30% 0.8612181 0.901060106 1/7/2010 0.876876983 0.900798725 0.93641785 35% 0.8769108 0.907272423 1/8/2010 0.927460109 0.901058561 0.936393891 40% 0.8890495 0.907730659 1/9/2010 0.805573236 0.898343607 0.93618528 45% 0.8987010 0.908824111 1/10/2010 0.767387962 0.897535734 0.936175397 50% 0.9074266 0.910344406 1/11/2010 0.815803332 0.902806462 0.936520998 55% 0.9186243 0.91127341 1/12/2010 0.973871556 0.910331625 0.936761604 60% 0.9291406 0.916058975 1/13/2010 0.870200544 0.909477212 0.936471879 65% 0.9375742 0.918452028 1/14/2010 0.816792184 0.911406416 0.935910021 70% 0.9508043 0.933213582 1/15/2010 0.719656685 0.914652893 0.936066968 75% 0.9657644 0.93460968 1/16/2010 0.932556152 0.918575658 0.936019262 80% 1.0062917 0.935339937 1/17/2010 1.049860425 0.915015475 0.935013675 85% 1.0455107 0.936319524 1/18/2010 0.915761203 0.901888686 0.934088466 90% 1.0921247 0.937340457 1/19/2010 0.77095404 0.898708716 0.933863471 95% 1.1443660 0.950551284 1/20/2010 0.913573667 0.901298488 0.934055629 99% 1.5261515 0.952933293 1/21/2010 0.70877378 0.899166381 0.934194198 1/22/2010 0.871564108 0.906613131 0.934952728 1/23/2010 0.902537536 0.907266142 0.935184673 1/24/2010 0.866524991 0.90803325 0.935371458 1/25/2010 0.786369381 0.903540407 0.935240593 1/26/2010 1.010196804 0.901253846 0.936335997 1/27/2010 0.976955675 0.892613611 0.936319524 1/28/2010 0.993905751 0.882581947 0.937333275 1/29/2010 1.040844581 0.876891632 0.937398865 1/30/2010 0.828691097 0.871614652 0.93707256 1/31/2010 0.846755473 0.873067845 0.937591682 2/1/2010 0.960533339 0.875772528 0.937896628 2/2/2010 1.361212974 0.871528435 0.937174382 2/3/2010 0.765705771 0.854515638 0.935686249 2/4/2010 1.010805244 0.856673156 0.936193305 2/5/2010 0.936257157 0.853001235 0.935339937 2/6/2010 0.884672068 0.848276321 0.93478376 2/7/2010 0.84601149 0.847746143 0.934839388 2/8/2010 0.78133704 1.033373859 0.935184854 2/9/2010 0.925509799 1.081604658 0.935617952 2/10/2010 1.041558236 1.085223359 0.935501392 2/11/2010 0.948239171 1.081732917 0.935037649 2/12/2010 0.928076671 1.081567901 0.934963002 2/13/2010 0.914186466 1.082261262 0.934820632 2/14/2010 0.837339649 1.082430532 0.934724801 2/15/2010 0.825750649 1.085100711 0.947943481 2/16/2010 0.656056757 1.088812401 0.948614058 2/17/2010 0.820362127 1.096540249 0.949711149 2/18/2010 0.848647182 1.101784571 0.950387923 2/19/2010 0.849610469 1.105498746 0.950551284 2/20/2010 0.932176258 1.109017669 0.950355592 2/21/2010 0.891154459 1.107760288 0.950666323 2/22/2010 0.925550773 1.109471331 0.950536569 2/23/2010 0.731739693 1.110028624 0.952526986 2/24/2010 0.717772547 1.115598737 0.952652521 2/25/2010 0.750989774 1.12230053 0.952965725 2/26/2010 0.676005751 1.127379888 0.952730845 2/27/2010 0.823196285 1.136069029 0.9531528612/28/2010 0.882535198 1.138491738 0.953023899 3/1/2010 0.872286879 1.141143498 0.953066929 3/2/2010 0.92789595 1.141894647 0.952803564 3/3/2010 0.833210554 1.140326476 0.952553616 3/4/2010 0.850829088 1.140805523 0.952209805 3/5/2010 0.83043131 1.141964272 0.951953041 3/6/2010 0.900647602 1.143175818 0.951720853 3/7/2010 0.794509727 1.143934449 0.951390325 3/8/2010 0.86876675 1.14566054 0.951852757 3/10/2010 6.414842942 1.146222267 0.952203213 3/21/2010 2.228261016 0.962229102 0.936883444 3/22/2010 1.034070849 0.917254452 0.933213582 3/23/2010 0.936844966 0.911282502 0.932915145 3/24/2010 0.943288694 0.908696174 0.9329696 3/25/2010 0.94887749 0.902507453 0.932911723 3/26/2010 0.919264562 0.899212861 0.932560305 3/27/2010 0.917445028 0.898874885 0.932723227 3/28/2010 0.937101359 0.896866658 0.932908082 3/29/2010 0.887892185 0.895807783 0.933076994 3/30/2010 0.977691776 1.046515526 0.93338318 3/31/2010 0.960072452 1.208492026 0.932838572 4/1/2010 0.955178153 1.345803901 0.932759173 4/2/2010 0.894454816 1.516760363 0.933204537 4/3/2010 0.942485758 1.535592438 0.933369759 4/4/2010 0.942269558 1.536004297 0.933564842 4/5/2010 0.898843099 1.531957269 0.933568787 4/6/2010 0.918826325 1.527578555 0.933723278 4/7/2010 0.903370522 1.528798217 0.933947891 4/8/2010 0.936679977 1.526308766 0.933996448 4/9/2010 0.895877552 1.51969042 0.934084559 4/10/2010 0.962088001 1.519013415 0.93424261 4/11/2010 0.894821353 1.512494929 0.934117303 4/12/2010 0.880850824 1.512708978 0.934479146 4/13/2010 0.847581961 1.515653142 0.93460968 4/14/2010 0.88559155 1.517275526 0.934768723 4/15/2010 0.866777697 1.515391375 0.934994286 4/16/2010 0.923406539 1.512852058 0.935191406 4/17/2010 0.846292461 1.510528817 0.93520319 4/18/2010 0.885618542 1.513892551 0.935381728 4/19/2010 0.895047991 1.516018041 0.935687546 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0.886171756 2/8/2011 0.893532271 0.890753491 2/9/2011 0.903624654 0.890401261 2/10/2011 0.868122067 0.88935684 2/11/2011 0.665122111 0.891119206 2/12/2011 0.874077843 0.898152187 2/13/2011 0.702243922 0.898323194 2/14/2011 0.565516946 1.063653668 2/15/2011 0.712159094 1.080486802 2/16/2011 0.833638111 1.09196467 2/17/2011 0.841091695 1.099756221 2/18/2011 0.964151458 1.101995631 2/19/2011 0.985637261 1.095796675 2/20/2011 0.956223957 1.097795207 2/21/2011 0.970714274 1.094047547 2/22/2011 0.818759246 1.116758837 2/23/2011 1.186191814 1.115385522 2/24/2011 1.004183915 1.103582199 2/25/2011 1.346974832 1.092284691 2/26/2011 1.017846076 1.075053574 2/27/2011 0.921743494 1.066996213 2/28/2011 1.01817064 1.066212807 3/1/2011 0.958060534 1.058145742 3/2/2011 0.696913779 1.054099219 3/3/2011 0.818044129 1.054459405 3/4/2011 0.950781361 1.052428283 3/5/2011 0.699325976 1.045591661 3/6/2011 0.733252687 1.048280956 3/7/2011 0.904976265 1.055949117 3/8/2011 0.972106422 1.059006007 3/9/2011 0.939417887 1.054040035 3/10/2011 0.882965385 1.052351486 3/11/2011 0.872292008 1.053757354 3/12/2011 0.920993059 1.056571657 3/13/2011 0.876111543 1.056610667 3/14/2011 0.879208045 1.054760621 3/15/2011 5.662158144 1.058078048 3/16/2011 1.070510972 0.902170022 3/17/2011 1.056495138 0.899778122 3/18/2011 1.067384621 0.897883295 3/19/2011 0.908274002 0.888267467 3/20/2011 0.778182788 0.889028053 3/21/2011 1.045593215 0.900346495 3/22/2011 0.843794151 0.897318751 3/23/2011 1.652052992 0.9029819813/24/2011 0.777559775 0.87937053 3/25/2011 0.832092142 0.885292949 3/26/2011 0.665258661 0.890916879 3/27/2011 0.830041322 0.899444716 3/28/2011 0.776125243 0.90407136 3/29/2011 0.898241336 0.909986058 3/30/2011 0.776158689 0.910589711 3/31/2011 0.836664824 0.918947556 4/1/2011 0.707719367 0.922008582 4/2/2011 0.757110469 0.928605696 4/3/2011 0.745682713 0.935632751 4/4/2011 0.780004814 0.942067544 4/5/2011 0.96329751 0.946990972 4/6/2011 0.996682984 0.945263014 4/7/2011 0.823127247 0.945281648 4/8/2011 0.888761431 0.950014091 4/9/2011 0.92514141 0.951170595 4/10/2011 0.956721109 0.951324149 4/11/2011 0.922163346 0.951222381 4/12/2011 0.820610172 0.951272527 4/13/2011 0.978730861 0.95619971 4/14/2011 0.984917351 0.95505119 4/15/2011 0.99875399 0.952048309 4/16/2011 0.999650323 0.950691039 4/17/2011 0.778909788 0.948116451 4/18/2011 0.931091577 0.952630913 4/19/2011 1.117736045 0.95248216 4/20/2011 0.954760891 0.946070713 4/21/2011 1.013691042 0.947828051 4/22/2011 0.943709457 0.946735707 4/23/2011 0.955232355 0.945461847 4/24/2011 1.000810053 0.945615444 4/25/2011 0.921093768 0.945361604 4/26/2011 0.968840632 0.946843564 4/27/2011 0.953566181 0.946091298 4/28/2011 0.916350939 0.943231207 4/29/2011 1.02689402 0.944835322 4/30/2011 0.928495608 0.941289842 5/1/2011 0.905632801 0.94150126 5/2/2011 0.967922114 0.942296644 5/3/2011 0.938726503 0.944194738 5/4/2011 0.927707641 0.945025695 5/5/2011 0.911458773 0.948074456 5/6/2011 0.997242007 0.95091752 5/7/2011 0.965100535 0.952848399 5/8/2011 0.923456569 0.956133742 5/9/2011 0.929748017 0.9601478 5/10/2011 0.953668057 0.96494314 5/11/2011 0.923667746 0.968903956 5/12/2011 0.968425664 0.988358619 5/13/2011 0.944275254 0.989680861 5/14/2011 0.894830906 0.990358197 5/15/2011 0.9580359 0.992642528 5/16/2011 0.922412694 0.992651826 5/17/2011 0.914343653 0.995107367 5/18/2011 0.926628969 0.998168351 5/19/2011 0.925392651 1.000936218 5/20/2011 1.007481032 1.005562018 5/21/2011 0.980920702 1.006291653 5/22/2011 0.905493661 1.0069663145/23/2011 0.959840279 1.007654668 5/24/2011 0.993194834 1.010437508 5/25/2011 0.965552564 1.011961313 5/26/2011 0.946272653 1.013286268 5/27/2011 0.867763468 1.016791048 5/28/2011 0.96447438 1.022026841 5/29/2011 0.920529625 1.023948186 5/30/2011 0.934838156 1.026975758 5/31/2011 0.929494303 1.029329849 6/1/2011 1.024864953 1.032578493 6/2/2011 0.963655205 1.03164787 6/3/2011 1.019170473 1.033244814 6/4/2011 0.996750682 1.031832313 6/5/2011 1.055168389 1.029917208 6/6/2011 1.063660825 1.026301063 6/7/2011 1.043878308 1.022320538 6/8/2011 1.073608206 1.016233167 6/9/2011 1.072492539 1.009273547 6/10/2011 1.507307648 1.003330945 6/11/2011 1.008092923 0.983367398 6/12/2011 0.964595332 0.980451815 6/13/2011 0.963360842 0.97887993 6/14/2011 0.958314822 0.978085497 6/15/2011 0.996078928 0.977904667 6/16/2011 1.006173174 0.976521452 6/17/2011 1.009664988 0.972874084 6/18/2011 1.064166645 0.970346617 6/19/2011 1.029370099 0.964370177 6/20/2011 1.001160526 0.960151356 6/21/2011 0.926144276 0.955989089 6/22/2011 1.043325463 0.956407221 6/23/2011 1.038909002 0.951807039 6/24/2011 1.005301195 0.948271914 6/25/2011 1.051416061 0.946781631 6/26/2011 1.024837268 0.940878735 6/27/2011 1.022114729 0.93767154 6/28/2011 1.011356772 0.935818894 6/29/2011 1.005460889 0.933140768 6/30/2011 1.026953644 0.931029598 7/1/2011 0.99694625 0.927259591 7/2/2011 1.01156351 0.924423658 7/3/2011 0.976795468 0.923582688 7/4/2011 0.93929753 0.923153761 7/5/2011 0.94668404 0.922613964 7/6/2011 0.944245064 0.922034189 7/7/2011 0.86125717 0.922275659 7/8/2011 0.864819606 0.926409359 7/9/2011 0.894214476 0.931864513 7/10/2011 0.90840125 0.931983165 7/11/2011 0.92062542 0.930565804 7/12/2011 0.917438803 0.931622897 7/13/2011 0.939527857 0.930706658 7/14/2011 0.952889904 0.929498516 7/15/2011 0.954582473 0.92719178 7/16/2011 0.896752149 0.928845001 7/17/2011 0.933840982 0.940981439 7/18/2011 0.884873451 0.94586413 7/19/2011 0.902805465 0.951027422 7/20/2011 0.876292509 0.95426254 7/21/2011 0.938688225 0.9592006577/22/2011 0.905320009 0.959690519 7/23/2011 0.932855245 0.961749344 7/24/2011 0.960592712 0.963723182 7/25/2011 0.874329175 0.964723735 7/26/2011 0.928621431 0.969905079 7/27/2011 0.966535353 0.974451928 7/28/2011 0.931012993 0.976375364 7/29/2011 0.942125764 0.977604903 7/30/2011 0.913853456 0.9796701 7/31/2011 0.911868258 0.988144105 8/1/2011 0.986334403 0.994670878 8/2/2011 0.963927648 0.997341446 8/3/2011 0.923103634 1.001280927 8/4/2011 0.929290776 1.005966757 8/5/2011 0.951489178 1.009872866 8/6/2011 0.985268161 1.012107373 8/7/2011 1.028474235 1.015323792 8/8/2011 0.897774029 1.015217426 8/9/2011 0.865880428 1.022561346 8/10/2011 0.952338213 1.034842774 8/11/2011 0.889951635 1.110452736 8/12/2011 0.903283599 1.111939258 8/13/2011 0.883687809 1.10540746 8/14/2011 1.004179095 1.100470279 8/18/2011 1.260845305 1.096808203 8/19/2011 1.080321714 1.081971535 8/20/2011 1.039772195 1.064017904 8/21/2011 0.999858999 1.045267644 8/22/2011 1.024436039 1.044077666 8/23/2011 0.953384082 1.031866888 8/24/2011 0.967084742 1.026830879 8/25/2011 0.992070391 1.022436002 8/26/2011 0.990609312 1.009446806 8/27/2011 1.029769508 0.990956659 8/28/2011 1.065026877 0.976607153 8/29/2011 1.024238451 0.968228262 8/30/2011 0.967899169 0.956296412 8/31/2011 1.00408166 0.939390788 9/1/2011 1.168073597 0.928364153 9/2/2011 1.107671449 0.938646389 9/3/2011 1.066451461 0.931660666 9/4/2011 1.082112066 0.924486499 9/5/2011 1.063678525 0.915664598 9/6/2011 1.046474049 0.90758714 9/7/2011 1.018524384 0.89872886 9/8/2011 1.081760753 0.889135019 9/9/2011 1.025283241 0.877910962 9/10/2011 1.118091631 0.870322292 9/11/2011 1.234323284 0.857498178 9/22/2011 3.22063707 0.840127439 9/23/2011 0.934547276 0.752220672 9/24/2011 0.70732967 0.748014408 9/25/2011 0.73557238 0.749742116 9/26/2011 0.894316801 0.750769994 9/27/2011 0.815745281 0.745838041 9/28/2011 0.541712763 0.740630316 9/29/2011 0.477264397 0.753212799 9/30/2011 0.964159675 0.776430334 10/1/2011 0.658112683 0.7659437 10/2/2011 0.802303819 0.77118270110/3/2011 0.835238438 0.771533783 10/4/2011 0.602394502 0.770293335 10/5/2011 0.435904899 0.772272501 10/6/2011 0.599284353 0.784444718 10/7/2011 0.813660124 0.788701624 10/8/2011 0.666282955 0.787079144 10/9/2011 0.460730458 0.789566977 10/10/2011 0.673282615 0.801134424 10/11/2011 1.476540659 0.803601682 10/12/2011 0.898099775 0.780136002 10/13/2011 0.851226432 0.775690043 10/14/2011 0.81745504 0.774716446 10/15/2011 0.821354801 0.773838183 10/16/2011 0.780725643 0.773751762 10/17/2011 0.730709149 0.776003063 10/18/2011 0.745039057 0.780265937 10/19/2011 0.79762312 0.783572663 10/20/2011 0.733368217 0.785677879 10/21/2011 0.713201109 0.788505958 10/22/2011 0.583434071 0.792363875 10/23/2011 0.808359348 0.800387547 10/24/2011 0.759160926 0.802359087 10/25/2011 0.766408699 0.802912703 10/26/2011 0.746358238 0.805647776 10/27/2011 0.659513518 0.808372141 10/28/2011 0.919187244 0.810857515 10/29/2011 1.173790451 0.805456617 10/30/2011 0.649560647 0.790584219 10/31/2011 0.815282715 0.795255028 11/1/2011 0.812836293 0.795886707 11/2/2011 0.798025 0.796213532 11/3/2011 0.661769484 0.797613269 11/4/2011 0.801071391 0.803210061 11/5/2011 0.726991546 0.802540274 11/6/2011 0.764985731 0.806514497 11/7/2011 0.74091792 0.80718275 11/8/2011 0.807753877 0.808577984 11/9/2011 0.747300349 0.808311688 11/10/2011 0.772570283 0.809432596 11/11/2011 0.764720994 0.80846901 11/12/2011 0.822018523 0.808016503 11/13/2011 0.791107152 0.80645422 11/14/2011 0.818762154 0.876015235 11/15/2011 0.848264677 0.876968375 11/16/2011 0.858595384 0.898175542 11/17/2011 0.844240837 0.894145189 11/18/2011 0.860779588 0.886416376 11/19/2011 0.818210588 0.883318816 11/20/2011 0.828938636 0.88182292 11/21/2011 0.824144209 0.874363956 11/22/2011 0.867505566 0.867403568 11/23/2011 0.7757694 0.861444308 11/24/2011 0.848460885 0.857143869 11/25/2011 0.828089181 0.849836161 11/26/2011 0.734074752 0.847747512 11/27/2011 0.75716031 0.845062098 11/28/2011 0.72761849 0.838612088 11/29/2011 0.789684917 0.832781439 11/30/2011 0.834233078 12/1/2011 0.82264106712/2/2011 0.840017091 12/3/2011 0.82967326 12/4/2011 0.780977762 12/5/2011 0.846218263 12/6/2011 0.785033295 12/7/2011 0.782774965 12/8/2011 0.799764975 12/9/2011 0.780927591 12/10/2011 0.743662701 12/11/2011 0.75114578 12/12/2011 0.775150035 12/16/2011 2.877937626 12/17/2011 0.847356331 12/18/2011 1.484479691 12/19/2011 0.737684795 12/20/2011 0.612376456 12/21/2011 0.767852788 12/22/2011 0.773333706 12/23/2011 0.605169709 12/24/2011 0.615332583 12/25/2011 0.688727759 12/26/2011 0.64675622 12/27/2011 0.629229639 12/28/2011 0.765429738 12/29/2011 0.653512332 12/30/2011 0.563659983 12/31/2011 0.552699044AgriumWestSacramento2010‐20110.00.20.40.60.81.01.21.41.61.80% 20% 40% 60% 80% 100%Percentile30‐OpDayAvg(lbNOx/tHNO3)365‐OpDayAvg(lbNOx/tHNO3)