New Hampshire Revised Sulfur Dioxide Page 3 Nonattainment Area Boundary Recommendation July 6, 2011
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New Hampshire Revised Sulfur Dioxide Page 3 Nonattainment Area Boundary Recommendation July 6, 2011 FIGURE 1. Proposed Central New Hampshire 1-Hour Sulfur Dioxide Nonattainment Area Pittburg New Hampshire Cl ar ks vi lle Atkinson & Gilmanton Academy Grant Stewartstown Dixs Second Grant Co lle ge Colebrook Gran t Di xv ille Wentworths Columbia Lo c at io n Ervings Location M ill sf ield Errol Od e ll Stra tford Dummer Cambridge Central New Hampshire Stark North Mi lan 1-Hour SO2 Nonattainment Area Umbe rland K ilk en n y Be r lin Lancaster Sucess Go r h am Dal ton Je ff er s on R an d ol ph Shelburne Wh ite fi eld SO2 Monitor Exceeding 1-Hour NAAQS Ma r tin s L oc . L itt le to n Low&Burbanks Gre en s Gr an t Gr a nt Ca rroll Be ans Pinkhams Mo n r o e Purchase Grant SO2 Monitor Meeting the 1-Hour NAAQS Lyman Bethlehe m Sargents Lisbon Purc hase Cr aw fo r d s Sugar Purchase Hil l Franconia Ba th Ja ck so n Bea ns Ch a tha m Gran t Landaff Easton Ha les H av erh ill Lincoln He b ron Location Benton Li ve rm o r e Conway Woodstock Piermont Albany Wa te rv ille Warren Valley Thornton Orfo r d Ells wo r th Madison Eaton Wentworth Tamworth Rumney Campton Sandwich Freedom Ly m e Dorchester Holde rne ss Groton Plymouth Effingham Moulton As hl and Hebron Hanover borough Ossipee Hebron Tuftonboro Enfield Bridge Ne w water Le b an o n Orange Ha mpto n Ale xa ndria Meredith Bris tol Enfield Wolfboro Wakefield Grafton Laconia Pl antfield Brook Gi lfo r d fie ld Da nbury H ill Sanbornton Gr an t ha m Springfield Alton Middle Corni sh Wil mot Tilton Belmont Ne w to w n Franklin Croydon Andove r Durham New G ilma n to n M ilt on London No rthfi eld C laremont Sunapee Newport Salibury Farmington Ba rns tead Sutton C anterbury Loudon Un ity Newbury Webster Pittsfield Rochester Goshen Strafford Wa rne r Sommersworth Charle s Bradf ord Concord to wn Ac worth Lempster Eps om Northwood Ba rringt on R ol lin g sf ord Hopkinton Do v er Langdon He nnik er Madbury Washington Pembroke Hillsborough A lle ns Marlow De erfi eld Bow town Nottingham A lst ea d Lee Du rham Newing Du nba rton ton Stoddard De ering Weare Hookset Ports Wal pole An t ri m Ca ndi a New mark et Ne w C as tle Gils u m Epping Green mouth Raymond New fi elds la n d Be nning Go ff st o wn Su lliv an Strat Surry ton Frances Auburn ham Ry e Ne lson Manchester Brent to wn Fremont Wood North West Hannock Ne w Ches ter Exeter Ha mpton Bos ton moreland Keene G r ee nl an d Ro x bury Ha mp Hampton Har r is vil le Bedford San Da n East Ke ns down Ki ngs Kings to n Mt . Vill e in g to n Lynde ton ton F all s Ma r l Du b lin Peter Ve rnon London Ch es te rfie ld borough Derry Ha m p st ea d Seabrook bo r o ug h borough Merrimack Derry South Sw anz ey Amherst Ne wton Ha mpto n Ja ff re y Wilt o n Litchfield Atkinson Hin s da le Troy Sharon Te m p le Mi lfo r d Windham Winchester Hudson Salem Ri chmound F it zw illi am Rindge Ne w Ho lli s B roo k lin e Na s hua Pe lham Ip s wic h Mason New Hampshire Revised Sulfur Dioxide Page 4 Nonattainment Area Boundary Recommendation July 6, 2011 ATTACHMENT A TECHNICAL ATTACHMENT Rationale for New Hampshire’s 1-Hour Sulfur Dioxide Nonattainment Area Boundaries New Hampshire Revised Sulfur Dioxide Page A-1 Nonattainment Area Boundary Recommendation July 6, 2011 Rationale for New Hampshire’s 1-Hour Sulfur Dioxide Nonattainment Area Boundaries The recommendations contained in this letter are fully compliant with Section 107(d)(1)(A) of the Clean Air Act (“CAA”) which defines a nonattainment area as any area that (1) does not meet a National Ambient Air Quality Standard (“NAAQS”), or (2) contributes to ambient NAAQS violations in a nearby area. The New Hampshire recommended nonattainment area boundaries fulfill these requirements and exercises the flexibility allowed in the guidance, including consideration of: existing air quality, emission patterns, prevailing meteorology, topography and terrain, and jurisdictional boundaries. To a limited degree, airflow trajectories were also considered. The starting point of attainment area boundary designations is the examination of existing monitoring data. Table A1 contains the most recent 4 years of quality assured monitoring data for 1-hour average SO2 in New Hampshire. The locations of these monitors are marked in Figure 1 (above) and Figure A1 (below). TABLE A1. Estimated 2007 – 2010 1-Hour SO2 Design Values by Monitor, in parts per billion (ppb) Location Monitor 2007 2008 2009 2010 2007- 2008- SO2 ID 98th 98th 98th 98th 2009 2010 NAAQS Percentile Percentile Percentile Percentile Design Design (ppb) Value Value Concord 33-013-1007 -- -- -- 46 -- 46 75 Manchester 33-011-0020 58 48 50 57 52.0 51.7 75 Pembroke 33-013-1006 165 141 222 217 176.0 193.3 75 Portsmouth 33-015-0014 59 62 42 45 54.3 49.7 75 State -- 165 141 222 217 176.0 193.3 75 Maximum All but one of the New Hampshire SO2 monitors indicate attainment of the new SO2 NAAQS. Monitors located in Manchester and Portsmouth have recent 3-year design values of about two- thirds the level of the new NAAQS. A monitor located in Concord does not have 3 years’ worth of data, or even a full single year of data, but the 98th percentile of the data that does exist suggests that the monitor is likely to also meet the level of the new NAAQS. Only the Pembroke monitor fails to meet the level of the new SO2 NAAQS. This monitor is located about 0.4 miles to the southeast of a coal-fired power plant and is strategically located to capture the power plant’s worst-case air pollution impacts. The power plant, Merrimack Station, is subject to a state air pollution law that requires the installation of a scrubber system for the reduction of mercury emissions and SO2 emissions (as part of a Best Available Retrofit Technology (BART) requirement in the New Hampshire Regional Haze SIP). This scrubber system is under construction and is reportedly ahead of its construction schedule. Since the existing stacks for the station are relatively short, there is relatively poor dispersion of air pollutants. Part of the pollution control project includes New Hampshire Revised Sulfur Dioxide Page A-2 Nonattainment Area Boundary Recommendation July 6, 2011 FIGURE A1. Presumptive Norm – Merrimack County Boundary Pittburg New Hampshire Cl ar ks vi lle Atkinson & Gilmanton Academy Grant S te wa r ts to wn Dixs Second Grant Co lle ge Colebrook Gr an t Di xv ille Wentworths Columbia Lo c at io n E r vin g s Location M ill sf ield Errol Od e ll S tr a tfo r d Du mmer Ca mbridg e Stark North Mi lan Umbe rl and Kilkenny Be rlin SO2 Monitors (2008-2010) Lancaster Sucess Go r h am Dal ton Je ff er s on Randolph Shelburne Whitefield SO2 Monitor Exceeding 1-Hour NAAQS Martins Loc. L itt le to n Low&Burbanks Gr e en s Gr an t Gr a nt Ca rro ll Be ans Pinkhams Mo n r o e Purchase Grant SO2 Monitor Meeting the 1-Hour NAAQS Lyman Bethlehe m Sargents Lisbon Purchase Cr aw fo r d s Sugar Purchase Hil l Franconia Ba th Ja ck so n Bea ns Cha tha m Gr an t Landaff Easton Ha les Haverhill Lincoln He b ron Location Benton Li ve rm o r e Conwa y W oodstock Piermont Albany Wa te rv ille Warren Valley Thornton Or fo r d Ells wo r th Madison Eaton Went worth Ta m wo r th Rumney Campton Sa ndwich Fr e ed o m Ly m e Dorches ter Ho lde rne ss Groton Plymouth Effingham Moulton As hl and Hebron Hanover borough Ossipee Hebron Tuftonboro Enfield Bridge Ne w water Le b an o n Or an g e Ha mpton Alexandria Meredith Bris tol Enfield Wolfboro Wakefield Grafton Laconia Pl an tf ie ld Brook Gi lfo r d fie ld Da nbury H ill Sanbornton Gr an t ha m Springfield Alt on Middle Cornish Wil mot Tilton Belmont Ne w to w n F ran k lin Croydon Andove r Du rham New Gilmanton M ilt on London Northfi eld Claremont Sunapee Ne wport Sali bury Farmington Ba rns te ad SuttonMerrimackCanterbury Loudon Un ity Newbury Webster Pi ttsfield Rochester Goshen Strafford Wa rne r Sommersworth Ch arle s Bradf ordCounty Concord to wn Ac worth Lempster Epsom Northwood Ba rri ngt on R ol lin g sf ord Hopkinton Do v er Langdon He nnik er Madbury Washington Pembroke Hill sb o r oug h Allens Marlow De er fi eld Bo w town Nottingham Alstead Lee Du rham Newing Dunbarton ton Stoddard De erin g Weare Hookset Ports Wal pole Ant rim Ca ndi a New mark et Ne w C as tle Gils u m Epping Green mouth Ra ymo nd New fi elds la n d Be nning Go ff st o wn Su lliv an Strat Surry ton Frances Au bu rn ham Ry e Ne lson M an c he st er Brent to wn Fremont Wood No rth Wes t Hannock Ne w Ch es te r Exeter Ha mp ton Bos ton moreland Keene G r ee nl an d Rox bury Ha mp Hamp t on Harris vil le Bedford San Da n East Ke ns down Ki ngs Kings to n Mt .