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Revised- Ohio’s Recommended Designations for the 2010 1 -hour SO 2 Standard

Technical Evaluation

Ambient Air Quality Data

**The air quality analysis examines the 3-year average of the 99**  **th percentile of the yearly**  **distribution of 1-hour daily maximum SO 2**  **concentrations for each county based on data for 2010 through 2012. The level of the new 1-hour SO**  **2 standard is 75 ppb. Data is**  retrieved from the U.S. EPA’s Air Quality System (AQS) at **http://www.epa.gov/ttn/airs/airsaqs/ and is presented in ppb in all tables. Monitoring**  **sites that have less than 75 percent capture in any one qu arter are highlighted in red.**  **Ohio EPA operates a network of federally approved monito rs. AQS data retrieval**  **sheets are provided in Appendix A. The State and local a ir monitoring stations (SLAMS)**  **data certification report for calendar year 2011 is provided i n Appendix B. The**  **combined monitoring data for monitors 39-105-1001 and 39 -105-0003 are provided in**  **Appendix C. As noted above, Ohio EPA is committed to completing all QA/QC and**  **certification for Ohio monitor 39-105-0003 by March 29, 20 13. This is the only Ohio**  **monitor that affects this revision request. It is Ohio EP A’s understanding that the West**  **Virginia Department of Air Quality intends to certify a ll of the WV data associated with**  **these changes also.**

**Based on the most recent ambient data as shown in Table 1 below, Ohio has** 

**determined that several monitors in both Ohio and in We st Virginia Counties which**  **border Ohio are now attaining the standard. Given the m ost recent data, Ohio is, as**  **detailed in the previous section, recommending several area s that may have potentially**  **been designated nonattainment be designated as unclassifi able. The requested**  **designations for all other counties remain the same as provid ed in our initial June 3**  **, 2011 submittal and the subsequent revision submitted on**  **April 12, 2012. 2** **County(s) Proposed/Anticipated Designation Designating Agency Proposing** **Nonattainment Associated Monitor with ID** **2009 2010 2011 2012 2009-2011 2010-2012**39-081-0017 85.0 127.0 114.0 92.0 109 11139-081-0018 -- -- 55.0 43.0 -- --39-081-0020 43.0 31.0 -- --54-009-0005 (Brooke Co., WV) 82.0 131.0 143.0 76.0 119 11754-009-0007 (Brooke Co., WV) 81.0 92.0 75.0 68.0 83 7854-009-0011 (Brooke Co., WV) 143.0 143.0235.0126.0 174 16854-009-6000 (Brooke Co., WV) -- -- 46.0 31.0 46 3954-029-0005 (Hancock Co., WV) 139.0 85.0 33.0 24.0 86 4754-029-0007 (Hancock Co., WV) 113.0 50.0 36.0 34.0 66 4054-029-0008 (Hancock Co., WV) 133.0 44.0 30.0 23.0 69 3254-029-0009 (Hancock Co., WV) 131.0 68.0 66.0 44.0 88 5954-029-0015 (Hancock Co., WV) 102.0 68.0 34.0 25.0 68 4254-029-1004 (Hancock Co., WV) 97.0 51.0 63.0 45.0 70 5339-105-100194.0 94.0 -- 92 --39-105-0003 -- -- 26.0 -- 69WashingtonNon-Attainment (Warren, Dunham, andBelpre Townships in Washington County)Probable U.S. EPA 54-107-1002 (Wood Co., WV) 119.0 84.049.024.0 84 52Monitor data combinedIncomplete DataTable 1: SO2 Monitoring Data and Design Values**99th Percentile 3-year Design Value** **Recommended Changes**JeffersonNon-Attainment (Saline, Knox, IslandCreek, Cross Creek, Steubenville, Wells,and Warren Townships)Ohio EPAAll monitors in Hancock county attain thestandard. The Ohio portion which bordersHancock County, Saline, Knox, and Island CreekTownships, are recommended unclassifiable.Cross Creek, Steubenville, Wells, and Warrenremain recommended as nonattainment.Meigs and GaliaNon-Attainment (Addison and CheshireTownships in Galia, and SalisburyTownship in Meigs County)Ohio EPA (Cheshire and Salisbury) andProbable U.S. EPA (Addison)88.0Cheshire, Addison, and Salisbury Townshipsattain the standard. Recommend unclassifiable.Monitor attains the standard. Recommendunclassifiable for these townships.**3**

**Meigs and Gallia Counties (Addison, Cheshire, and Salisb ury Townships)** 

**In 2011, SO 2**  **monitoring site 39-105-1001, located in the city of Po meroy in Meigs**  **County, was re-located due to an unforeseen and permanen t power interruption. The**  **monitor was relocated to site 39-105-0003, approximately 125 yards distance from the**  **previous location. This change was documented in Ohio’s a pproved Air Monitoring**  **Plan. The location of the two monitors is shown in Figu re 1.** 

Figure 1: Meigs County (Pomeroy Monitors)

**Relocation of the monitor interrupted data collection b etween June 29, 2011 and July** 

**13, 2011. However, once combined, the data meets all d ata collection requirements for**  **2011. The combined single complete data set from which the 99**  **th percentile was**  **obtained yielded a passing design value for period 2010 to 2012 of 69 ppb. The**  **combined data set was analyzed to determine the 99 th**  **percentile following the recommendations of 40 C.F.R Part 50, Appendix T; that i**  **s, the data were combined, the maximum daily value for each day of the year was determi**  **ned and sorted in descending**

**order to discern the 99 th**  **percentile. These data, in combined form, are provided in**  **Appendix C.**

**Jefferson County (Saline, Knox, and Island Creek Townshi ps)** 

**In Ohio EPA’s original June 3, 2011 submittal, Jefferson County was recommended as**  **a partial nonattainment area, with those Ohio township s bordering Brooke and Hancock**  **County, WV recommended nonattainment based, in part, u pon the knowledge of**  **violating monitors in both of those West Virginia Coun ties. The remainder of Jefferson** **4**

**County was recommended as unclassifiable. Figure 2 shows th e original recommended**  **designation area.**

Figure 2: Jefferson County Nonattainment Area**5**

**Nonattaiment designation recommendations were based, in part, on knowledge of**  **violating monitors in both Brooke and Hancock County, WV a nd the violating monitor in**  **Jefferson County, Ohio. Using the most recent monitoring data for 2012, as shown in**  **Table 1, all monitors in Hancock County are in attainment of the standard using the**  **2010 to 2012 design value. Indeed, these areas demon strate a dramatic improvement**  **in air quality. Ohio EPA is therefore recommending that those townships in Jefferson**  **County which border Hancock County in West Virginia be desi gnated unclassifiable.**  **These townships include Saline, Knox, and Island Creek. As shown in Figure 2, the**  **only major source of SO2 emissions in this area is the W.H. Sammis Plant in Saline**  **Township. In our June 3 rd**  **submittal, it was stated the meteorology of the region dictates**  **that this facility would primarily impact the Hancock Count y monitor, to the East. It is**  **reasonable in examining the meteorology of the region t o conclude that the W.H.**  **Sammis Plant is not the impacting source on the still-viol ating monitors in Jefferson**  **County, Ohio and Brooke County, WV. All other township s in Jefferson County will**  **retain their original recommended designation, therefore C ross Creek, Steubenville,**  **Wells, and Warren townships are recommended to be designate d nonattainment, and**  **the remainder of the County unclassifiable.**

**Washington County (Warren, Dunham, and Belpre Townships)**

**As stated previously, Ohio EPA was informed via several conv ersations with U.S. EPA**  **Region 5 of the possibility of several townships in Ohio which do not have an ambient**  **SO2 monitor, but may potentially impact monitors in oth er states, being designated**  **nonattainment by U.S. EPA. These conversations indicated that Warren, Dunham, and**  **Belpre Townships in Washington County, which border Wood County, WV, may be**  **designated nonattainment in this manner. Based on the most recent monitoring data**  **from monitor 54-107-1002, located in Parkersburg, WV (Wood County), this monitor is**  **now showing attainment of the standard, with a 2010 to 2012 design value of 52 ppb.**  **Although 2011 data does not meet the capture criteria f or this monitor, a substitution**  **analysis of the data was conducted in accordance with 40 C .F.R Part 50, Appendix T.**  **Ohio EPA and the West Virginia Department of Environm ental Protection worked jointly**  **on this analysis and both are in support of the results. Th e West Virginia Department of**  **Environmental Protection will be providing details of the analysis in a similar submittal**  **as this. Therefore, Ohio EPA is recommending that those townships in Washington**  **County which border Wood County, WV be designated as uncl assifiable, as per Ohio** 

**EP A’s June 3**  **rd submittal. Ohio EPA extends this recommendation to any**  **other townships which border Wood County, West Virginia.**