"Table 4. Early morning and late afternoon dissolved-oxygen concentrations and associated water-quality parameter values from instantaneous monitoring sites on the North Fork Shenandoah River, Virginia. " "[AM, early morning dissolved-oxygen concentration; PM late afternoon dissolved-oxygen concentration; oC, degrees Celsius; DOsat, dissolved-oxygen as percent air saturation; DO, dissolved oxygen; mg/L, milligrams per liter; mm Hg, millimeters of mercury; SC, specific conductance; temp, temperature; uS/cm, microsiemens per centimeter; --, no data]" Site number Statistic Date Time (local) Dosat (percent) DO (mg/L) DO1 (ratio) pH SC (uS/cm) Water temp (oC) Air temp (oC) Barometric pressure (mm Hg) 1 AM 7/27/1999 4:20 62.8 5.1 1.9 7.7 185 25.84 22 730 PM 7/27/1999 14:49 126.9 9.9 8.2 178 28.46 33 -- 2 AM 7/27/1999 4:26 71.9 6 1.6 7.7 278 24.14 22 730 PM 7/27/1999 14:55 129.5 9.9 8.2 307 29.13 -- 730 3 AM 7/27/1999 4:59 54.1 4.4 1.1 7.6 301 25.77 22 730 PM 7/27/1999 15:08 61.7 5 7.8 255 26.54 33 730 4 AM 7/27/1999 5:15 70.5 5.7 1.6 7.9 274 25.24 22 730 PM 7/27/1999 15:17 122 9.3 8.8 244 29.42 33 730 5 AM 7/27/1999 5:25 44.3 3.6 2.4 7.8 284 25.01 21 731 PM 7/27/1999 15:23 111 8.7 8.3 281 28.06 33 730 7 AM 7/27/1999 5:46 41.8 3.5 3.4 7.8 365 24.62 21.5 730 PM 7/27/1999 15:28 149.6 11.8 8.4 360 27.79 33 730 8 AM 7/27/1999 6:07 82 6.7 1.8 7.9 308 25.66 22 -- PM 7/27/1999 15:52 150.7 11.8 8.5 343 27.78 33 730 9 AM 7/27/1999 6:15 72.3 5.9 -- 7.9 426 25.74 22 -- PM -- -- -- -- -- -- -- -- -- 10 AM 7/27/1999 6:32 43 3.6 3.9 7.8 778 25.21 21 732 PM 7/27/1999 16:13 184.5 14 8.5 856 29.84 32 730 11 AM 7/28/1999 4:12 97.1 7.8 1.3 8.2 663 26.49 23 732 PM 7/27/1999 16:26 132.7 10.3 8.5 648 28.36 32 -- 12 AM 7/27/1999 7:05 30.9 2.6 3.8 7.8 780 24.11 -- 732 PM 7/27/1999 16:40 126.8 9.8 8.5 780 29.38 -- 732 14 AM 7/27/1999 7:17 25.1 2.1 3 7.7 756 23.78 22 732 PM 7/27/1999 16:46 80.8 6.3 8.2 730 28.06 32 732 15 AM 7/28/1999 4:21 49.2 4.3 2.9 7.8 544 22.67 23 732 PM 7/27/1999 17:04 150.8 12.3 8.4 510 25.62 33.5 732 16 AM 7/28/1999 4:30 47.7 4 2.8 7.7 462 24.27 33 732 PM 7/27/1999 17:14 139 11 8.4 510 27.32 33.5 732 17 AM 7/28/1999 4:40 65 5.3 2 7.9 514 25.47 23 732 PM 7/27/1999 17:32 137.6 10.8 8.4 516 27.93 33 732 18 AM 7/28/1999 4:50 47.1 3.9 2.5 7.8 482 25.58 23 732 PM 7/29/1999 14:30 120.8 9.8 8.3 496 24.31 31.5 730 21 AM 7/28/1999 5:08 33.3 2.7 3.3 7.7 458 25.41 23 732 PM 7/29/1999 14:42 112.1 9 8.3 432 26.62 31.5 730 24 AM 7/28/1999 5:28 41 3.4 3.5 7.8 447 24.56 22 736 PM 7/29/1999 14:55 150.9 12.1 8.4 430 26.39 32.5 730 25 AM 7/28/1999 5:46 27.7 2.3 3.4 7.8 444 25.3 22 236 PM 7/29/1999 15:10 98.3 7.9 8.3 422 26.82 32.5 730 26 AM 7/28/1999 5:50 39.7 3.8 3.5 7.7 464 17 22 736 PM 7/29/1999 15:26 149.9 13.3 8.3 232 21.13 32.5 732 31 AM 7/28/1999 6:18 64.4 5.5 2.2 7.8 456 22.87 22 739 PM 7/29/1999 15:38 152 12.1 8.6 448 27.02 32.5 732 33 AM 7/28/1999 6:29 45.5 3.7 3.3 8.1 452 25.38 22 740 PM 7/29/1999 16:02 154.9 12.3 8.6 440 27.06 33 733 35 AM 7/28/1999 5:50 51.4 4.2 3 7.9 427 25.83 26 736 PM 7/29/1999 16:20 166.4 12.6 8.9 413 29.79 33.5 732 36 AM 7/28/1999 5:40 73.6 5.9 2 8.5 419 26.88 25.5 -- PM 7/29/1999 16:35 151.6 11.9 8.8 409 28.04 33 733 39 AM 7/28/1999 5:10 95.2 7.5 1.3 8.9 437 27.59 25 737 PM 7/29/1999 16:00 124.1 9.7 8.8 434 27.85 34 733 40 AM 7/28/1999 4:40 60.5 4.9 3 8.9 440 26.35 25.5 738 PM 7/29/1999 15:45 189.1 14.5 9.1 426 29.19 32.5 734 41 AM 7/28/1999 4:15 58 4.7 3.3 8.6 455 26.23 24.5 738 PM 7/29/1999 15:35 202.2 15.3 9.3 416 29.74 33 734 42 AM 7/27/1999 6:40 76 6.1 1.7 9.3 412 26.92 24.5 738 PM 7/27/1999 17:40 132.4 10.3 9 445 28.21 35 735 43 AM 7/27/1999 5:50 68.8 5.6 2 8.9 425 25.95 23.5 740 PM 7/27/1999 17:10 149.5 11.4 9.6 390 29.52 35 736 44 AM 7/27/1999 5:58 56.4 4.5 2.8 9 417 26.47 23.5 -- PM 7/27/1999 17:15 163.2 12.5 9.5 392 29.48 34.5 -- 45 AM 7/27/1999 5:30 55.1 4.4 3.3 9 415 26.78 23 -- PM 7/27/1999 17:00 193.2 14.6 9.5 392 30.14 37 736 46 AM 7/27/1999 5:05 87.9 7 1.5 9.3 397 27.41 22.5 738 PM 7/27/1999 16:40 132.2 10.3 9.3 400 28.45 33 737 47 AM 7/27/1999 4:40 58.7 4.7 3 9.1 413 26.39 22 -- PM 7/27/1999 16:21 184.2 14 9.5 405 29.58 34.5 737 52 AM 7/27/1999 4:20 73.6 5.8 1.5 8.9 403 27.15 21.5 739 PM 7/27/1999 16:05 111.2 8.6 9 414 28.82 33.5 738 1 Dissolved oxygen ratio is calculated by dividing the late afternoon dissolved-oxygen concentration by the early morning dissolved-oxygen concentration