Count 106 135 3252 Mean 45.6 45.5 45.6 Median 45.7 46.4 46.5 Std. Dev. 0.8 7.1 31.0 Minimum 44.0 13.4 0.0 Maximum 47.1 67.5 179.2 99% t-value 2.362 2.355 2.328 99% UL 48 62 118 6.2 * All concentrations are in units of ppmd@7%O2 

### Wheelabrator Ridge SO2 Variability Analysis

January 1 to June 6, 2011

Parameter 30-Day

Rolling Average 24-Hour

Block Average 3-Hour

Rolling Average 2011 CISWI

Limit

### 1 720 45.440 25 744 45.302 49 768 45.370 73 792 45.291 97 816 45.767 121 840 45.651 145 864 45.483 169 888 45.611 193 912 45.466 217 936 45.192 241 960 44.917 265 984 45.015 289 1008 45.358 313 1032 45.148 337 1056 44.927 361 1080 44.370 385 1104 44.356 409 1128 45.378 433 1152 45.757 457 1176 45.654 481 1200 45.522 505 1224 45.290 529 1248 44.585 553 1272 44.489 577 1296 44.498 601 1320 44.631 625 1344 44.101 649 1368 44.291 673 1392 44.482 697 1416 44.006 721 1440 44.148 745 1464 44.257 769 1488 44.118 793 1512 44.545 817 1536 44.485 841 1560 44.190 865 1584 44.672 889 1608 44.540 913 1632 44.709 937 1656 44.527 961 1680 44.614 985 1704 44.468 1009 1728 44.155 1033 1752 45.016 1057 1776 44.211 1081 1800 45.128 1105 1824 45.684 1129 1848 45.003 Ridge 30-Day Rolling SO2 Averages January 1-June 6,

2011

Start Hour End Hour 30-Day Rolling SO2 Average (ppmc)

### 1153 1872 45.383 1177 1896 45.029 1201 1920 45.283 1225 1944 45.520 1249 1968 45.537 1273 1992 45.720 1297 2016 45.677 1321 2040 45.775 1345 2064 46.006 1369 2088 46.216 1393 2112 46.302 1417 2136 46.552 1441 2160 46.534 1465 2184 45.939 1489 2208 45.801 1513 2232 45.624 1537 2256 45.558 1561 2280 45.985 1585 2304 45.925 1609 2328 45.996 1633 2352 46.035 1657 2376 46.399 1681 2400 46.662 1705 2424 46.528 1729 2448 46.671 1753 2472 46.051 1777 2496 47.071 1801 2520 46.721 1825 2544 46.571 1849 2568 46.949 1873 2592 46.517 1897 2616 46.855 1921 2640 46.678 1945 2664 46.632 1969 2688 46.637 1993 2712 46.515 2017 2736 46.303 2041 2760 46.275 2065 2784 46.287 2089 2808 45.854 2113 2832 45.730 2137 2856 45.759 2161 2880 45.935 2185 2904 46.680 2209 2928 47.174 2233 2952 46.975 2257 2976 47.101 2281 3000 46.733 2305 3024 46.130 2329 3048 45.912 2353 3072 45.798 2377 3096 45.661 2401 3120 45.508 2425 3144 45.769 2449 3168 45.665

### 2473 3192 45.684 2497 3216 45.800 2521 3240 45.708 Count 106.000 A.Mean 45.567 Median 45.657 Std Dev 0.822 Variance 0.676 Kurtosis -0.837 Skewness -0.092 Range 3.169 Min 44.006 Max 47.174 99% t-value 2.362 99.5% t-value 2.624 99.9% t-value 3.170 99% UL 47.509 99.5% UL 47.724 99.9% UL 48.1731 2447.7033348 25 48 48.2854156 49 72 46.3075066 73 96 38.2962456 97 12047.3745842 121 14440.3479195 145 16844.0991669 169 192 48.9075012 193 21648.6629143 217 24045.7191658 241 26447.7279167 265 28845.8679161 289 312 43.5037498 313 33644.1054115 337 360 50.5504265 361 38440.2504158 385 408 22.6887493 409 432 33.6816673 433 45646.6966667 457 48044.4895821 481 50449.1549988 505 528 67.5145798 529 552 47.4683342 553 57647.9070778 577 60043.8995819 601 624 58.855835 625 648 36.047081 649 672 41.4425049 673 696 53.5537567 697 72042.0754128 721 74443.5633278 745 768 50.3416634 769 792 43.9349976 793 816 52.5812531 817 84043.8925018 841 864 35.2970886 865 88847.9420815 889 912 44.5737495 913 93640.4191628 937 960 37.4695816 961 984 50.6795845 985 1008 56.1679268 1009 1032 37.1937523 1033 1056 37.4904137 1057 1080 33.8237534 1081 1104 39.8404121 1105 1128 53.3458366 1129 1152 45.0441628 1153 117643.6124992 1177 120040.5383301 1201 122442.1887474 1225 1248 46.346241 Ridge 24-Hour Block SO2 Averages January 1-June 6, 2011

Start Hour End Hour 24-Hour Block SO2 Average (ppmc)1249 1272 44.5933342 1273 129648.1962547 1297 1320 47.877079 1321 1344 42.970829 1345 136841.7374992 1369 1392 47.1595879 1393 1416 39.2679176 1417 144046.3354187 1441 146446.8487511 1465 148846.1725006 1489 1512 56.7583313 1513 1536 50.7545815 1537 1560 35.0454178 1561 158449.7570801 1585 160843.9937477 1609 1632 49.6291656 1633 1656 34.9754181 1657 168040.0708275 1681 170446.2979164 1705 1728 46.779171 1729 1752 63.0279121 1753 1776 13.3466682 1777 1800 61.3287468 1801 1824 56.519165 1825 1848 32.9237518 1849 1872 56.4279213 1873 1896 32.9958305 1897 192048.1766624 1921 194449.2704163 1945 196846.8566628 1969 1992 50.1000023 1993 201646.8920898 2017 2040 50.8187447 2041 206449.9037476 2065 208848.0358429 2089 2112 49.7495842 2113 213646.7595863 2137 216045.8091698 2161 2184 28.9954166 2185 2208 42.029583 2209 2232 51.4583321 2233 225648.7533302 2257 228047.8749962 2281 230447.9408379 2305 232846.1462517 2329 2352 50.782505 2353 237645.8975029 2377 240047.9758339 2401 242442.2716637 2425 2448 51.0529175 2449 2472 44.4270821 2473 249643.9695892 2497 2520 50.826664 2521 2544 52.0008278 2545 256844.2816658 2569 2592 43.4524994 2593 261643.1391602 2617 264042.8800049 2641 266447.86666492665 268847.0058403 2689 2712 46.4474983 2713 273640.5504227 2737 276049.9558372 2761 2784 50.2866707 2785 2808 35.0370865 2809 2832 46.0383339 2833 285647.6237488 2857 2880 51.0870857 2881 2904 51.3379211 2905 2928 56.8537407 2929 2952 45.4979134 2953 2976 52.5349998 2977 3000 36.8083344 3001 3024 29.8504181 3025 3048 39.6145821 3049 3072 47.3699989 3073 309641.7808304 3097 312043.3875008 3121 3144 50.1045799 3145 316847.9187469 3169 3192 45.0179138 3193 321647.4445801 3217 324048.0762596 Count 135 A.Mean 45.52 Median 46.35 Std Dev 7.07 Variance 49.94 Kurtosis 3.74 Skewness -0.79 Range 54.17 Min 13.35 Max 67.51 99% t-value 2.355 99.5% t-value 2.613 99.9% t-value 3.15 99% UL 62.16 99.5% UL 63.99 99.9% UL 67.803238 3240 48.33 3239 3241 69.89 3240 3242 95.42 3241 3243 95.75 3242 3244 88.33 3243 3245 71.43 3244 3246 59.58 3245 3247 57.19 3246 3248 61.59 3247 3249 62.49 3248 3250 62.66 3249 3251 59.18 3250 3252 58.63 3251 3253 58.25 3252 3254 56.65 Count 3252 A.Mean 45.62 Median 46.54 Std Dev 30.99 Variance 960.35 Kurtosis -0.37 Skewness 0.44 Range 179.15 Min 0.00 Max 179.15 99% t-value 2.328 99.5% t-value 2.577 99.9% t-value 3.09 99% UL 117.75 99.5% UL 125.49 99.9% UL 141.46