Chapter 8

~Table 18--Record of Experimental Filter Plant No. 2.~ ========+=====================+===================== |~Preliminary Filter.~| ~Final Filter.~ +-----------+---------+-----------+--------- Date. | Rate, | | Rate, | |millions of| Loss of |millions of| Loss of |gallons per| head. |gallons per| head. |acre daily.| |acre daily.| --------+-----------+---------+-----------+--------- 1907. --------+-----------+---------+-----------+--------- Feb. 8| 21.50 | 0.04 | 2.81 | 0.17 Feb. 9| 21.60 | 0.04 | 1.09 | 0.06 Feb. 10| 20.90 | 0.05 | 1.59 | 0.08 Feb. 11| 19.80 | 0.05 | 3.01 | 0.15 Feb. 12| 19.70 | 0.06 | 3.01 | 0.14 Feb. 13| 19.60 | 0.06 | 3.01 | 0.12 Feb. 14| 24.70 | 0.07 | 2.65 | 0.13 Feb. 15| 37.20 | ... | 3.40 | 0.12 Feb. 16| 37.30 | ... | 3.40 | 0.11 Feb. 17|Shut down for changes in meters and piping. Feb. 18| ... | ... | ... | ... Feb. 21| 44.50 | ... | 4.36 | 0.19 Feb. 22| 48.60 | ... | 4.37 | 0.16 Feb. 23| 48.40 | ... | 4.20 | 0.15 Feb. 24| 48.30 | ... | 4.02 | 0.13 Feb. 25| Shut down several hours. | 0.14 Feb. 26| 48.60 | 0.04 | 4.12 | 0.14 Feb. 27| 53.20 | 0.04 | 4.08 | 0.15 Feb. 28| 52.80 | 0.04 | 4.09 | 0.15 --------+-----------+---------+-----------+--------- Mar. 1| 53.00 | 0.04 | 4.10 | 0.16 Mar. 2| 53.30 | 0.04 | 4.11 | 0.16 Mar. 3| 50.60 | 0.05 | 4.11 | 0.16 Mar. 4| 42.40 | 0.05 | 4.12 | 0.17 Mar. 5| 42.70 | 0.05 | 4.11 | 0.17 Mar. 6| 48.60 | 0.07 | 4.13 | 0.17 Mar. 7| 50.50 | 0.08 | 4.12 | 0.18 Mar. 8| 51.80 | 0.09 | 4.12 | 0.18 Mar. 9| 53.00 | 0.10 | 4.12 | 0.18 Mar. 10| 54.40 | 0.12 | 4.11 | 0.19 Mar. 11| 51.00 | 0.12 | 4.12 | 0.19 Mar. 12| 51.20 | 0.12 | 4.07 | 0.19 Mar. 13| 50.50 | 0.12 | 4.00 | 0.19 Mar. 14| 46.50 | 0.12 | ... | 0.20 Mar. 15| 45.80 | 0.12 | 3.98 | 0.20 Mar. 16| 42.50 | 0.12 | 3.97 | 0.19 Mar. 17| 49.30 | 0.14 | 3.98 | 0.19 Mar. 18| 52.60 | 0.16 | 3.98 | 0.20 Mar. 19| 53.50 | 0.17 | 4.01 | 0.19 Mar. 20| 52.90 | 0.17 | 3.99 | 0.18 Mar. 21| 48.20 | 0.16 | 4.00 | 0.19 Mar. 22| 51.80 | 0.18 | 4.01 | 0.20 Mar. 23| 51.60 | 0.19 | 4.01 | 0.20 Mar. 24| 48.20 | 0.17 | 4.01 | 0.20 Mar. 25| 48.50 | 0.18 | 4.01 | 0.20 Mar. 26| 45.90 | 0.18 | 3.98 | 0.20 Mar. 27| 50.50 | 0.20 | 4.04 | 0.20 Mar. 28| 49.60 | 0.20 | 3.92 | 0.19 Mar. 29| 42.20 | 0.17 | 3.98 | 0.19 Mar. 30| 48.00 | 0.22 | 4.01 | 0.19 Mar. 31| 49.10 | 0.22 | 3.99 | 0.20 --------+-----------+---------+-----------+--------- Apr. 1| 49.10 | 0.24 | 4.00 | 0.20 Apr. 2| 49.70 | 0.25 | 4.00 | 0.20 Apr. 3| 51.40 | 0.27 | 4.00 | 0.21 Apr. 4| 48.70 | 0.27 | 4.00 | 0.22 Apr. 5| 48.10 | 0.27 | 4.00 | 0.22 Apr. 6| Shut down awaiting Mr. Maiguen | to apply bone-charcoal. Apr. 7| Removed 1.06 in. of sand. Apr. 8| 52.20 | 0.33 | 4.05 | 0.27 Apr. 9| 46.90 | 0.29 | 4.02 | 0.29 Apr. 10| 47.60 | 0.31 | 4.03 | 0.28 Apr. 11| 46.00 | 0.30 | 4.04 | 0.28 Apr. 12| 45.40 | 0.31 | 4.03 | 0.29 Apr. 13| 45.10 | 0.32 | 3.99 | 0.32 Apr. 14| 49.00 | 0.34 | 4.00 | 0.32 Apr. 15| 47.80 | 0.35 | 3.99 | 0.33 Apr. 16| 47.40 | 0.36 | 3.99 | 0.34 Apr. 17| 45.60 | 0.36 | 4.00 | 0.34 Apr. 18| 45.70 | 0.36 | 4.00 | 0.34 Apr. 19| 45.60 | 0.37 | 4.00 | 0.34 Apr. 20| 45.30 | 0.40 | 4.00 | 0.36 Apr. 21| 47.20 | 0.44 | 3.99 | 0.38 Apr. 22| 45.20 | 0.42 | 3.99 | 0.38 Apr. 23| 44.90 | 0.44 | 4.05 | 0.40 Apr. 24| 40.50 | 0.41 | 4.02 | 0.44 Apr. 25| 39.60 | 0.41 | 4.03 | 0.45 Apr. 26| 40.70 | 0.44 | 4.05 | 0.45 Apr. 27| 39.30 | 0.44 | 4.00 | 0.44 Apr. 28| 34.70 | 0.43 | 4.05 | 0.44 Apr. 29| 37.20 | 0.45 | 4.00 | 0.42 Apr. 30| 43.00 | 0.49 | 4.00 | 0.41 --------+-----------+---------+-----------+--------- May 1| 41.30 | 0.49 | 4.00 | 0.41 May 2| 42.40 | 0.49 | 4.00 | 0.41 May 3| 40.70 | 0.48 | 4.00 | 0.40 May 4| 33.80 | 0.47 | 4.00 | 0.39 May 5| 26.20 | 0.43 | 4.00 | 0.39 May 6| 29.00 | 0.38 | 3.99 | 0.37 May 7| 27.60 | 0.36 | ... | 0.37 May 8| 24.70 | 0.31 | 3.99 | 0.37 |Washed. | | | May 9| 24.40 | 0.03 | 3.98 | 0.39 May 10| 24.80 | 0.04 | 4.00 | 0.42 May 11| 50.00 | 0.06 | 4.00 | 0.44 May 12| 50.00 | 0.08 | 4.00 | 0.48 May 13| 50.00 | 0.09 | 4.00 | 0.47 May 14| 50.00 | 0.10 | 4.00 | 0.46 May 15| 48.50 | 0.15 | 4.00 | 0.45 May 16| 47.00 | 0.16 | 4.00 | 0.46 May 17| 47.00 | 0.16 | 3.99 | 0.47 May 18| 47.00 | 0.19 | 4.00 | 0.48 May 19| 47.00 | 0.21 | 3.99 | 0.51 May 20| 46.60 | 0.24 | 4.00 | 0.53 May 21| 46.40 | 0.24 | 4.00 | 0.55 May 22| 46.40 | 0.27 | 4.00 | 0.58 May 23| 46.40 | 0.29 | 4.00 | 0.61 May 24| 46.40 | 0.30 | 4.00 | 0.63 May 25| 46.40 | 0.32 | 4.00 | 0.66 May 26| 46.40 | 0.34 | 3.99 | 0.70 May 27| 46.40 | 0.86 | 3.99 | 0.74 May 28| 46.40 | 0.38 | 3.15 | 0.76 May 29| 46.00 | 0.44 | 3.88 | 0.78 May 30| 45.60 | 0.46 | 3.99 | 0.86 May 31| 45.60 | 0.46 | 4.00 | 0.92 --------+-----------+---------+-----------+--------- June 1| 45.60 | 0.46 | 4.00 | 0.98 June 2| 45.60 | 0.48 | 4.00 | 1.09 June 3| 45.60 | 0.51 | 4.00 | 1.20 June 4| 45.60 | 0.54 | 4.00 | 1.32 June 5| 45.60 | 0.55 | 4.00 | 1.48 June 6| 45.60 | 0.56 | 4.01 | 3.66 June 7| 45.00 | 0.57 | 4.00 | 1.80 June 8| 45.00 | 0.57 | 4.00 | 1.90 June 9| 45.00 | 0.55 | 4.01 | 2.00 June 10| 45.00 | 0.56 | 4.00 | 2.09 June 11| 45.00 | 0.58 | 4.00 | 2.17 June 12| 45.00 | 0.60 | 4.01 | 2.27 June 13| 45.00 | 0.62 | 4.00 | 2.36 June 14| 45.00 | 0.63 | 3.99 | 2.49 June 15| 45.00 | 0.64 | 3.99 | 2.56 June 16| 44.70 | 0.65 | 4.00 | 2.63 June 17| 44.40 | 0.64 | 4.00 | 2.67 June 18| 45.00 | 0.63 | 3.98 | 2.69 June 19| 45.00 | 0.63 | 4.00 | 2.73 June 20| 45.00 | 0.62 | 4.01 | 2.72 June 21| 45.00 | 0.61 | 4.01 | 2.68 June 22| Shut down to scrape and apply asbestos | and coke; removed 0.79 in. of sand. June 23| Applied 8 lb. of asbestos and | 10 lb. of bone-charcoal. June 25| 50.00 | 0.54 | 4.00 | 0.27 June 26| 50.00 | 0.57 | 4.01 | 0.46 June 27| 50.00 | 0.63 | 4.01 | 0.55 June 28| 50.00 | 0.65 | 3.99 | 0.63 June 29| 50.00 | 0.70 | 4.00 | 0.73 June 30| 50.00 | 0.77 | 3.99 | 0.82 --------+-----------+---------+-----------+--------- July 1| 50.00 | 0.87 | 4.00 | 0.80 July 2| 50.00 | 0.95 | 4.01 | 0.73 July 3| 50.00 | 1.01 | 4.00 | 0.66 July 4| 50.00 | 1.03 | 4.00 | 0.58 July 5| 50.00 | 1.07 | 3.99 | 0.54 July 6| 50.00 | 1.10 | 4.00 | 0.52 July 7| 50.00 | 1.14 | 4.00 | 0.50 July 8| 50.00 | 1.16 | 4.00 | 0.48 July 9| 50.00 | 1.18 | 4.00 | 0.46 July 10| 50.00 | 1.20 | 3.99 | 0.45 July 11| 50.00 | 1.20 | 3.99 | 0.45 July 12| 50.00 | 1.20 | 4.01 | 0.44 July 13| 50.00 | 1.15 | 4.00 | 0.47 July 14| 50.00 | 1.15 | 4.00 | 0.48 July 15| 50.00 | 1.14 | 3.99 | 0.48 July 16| 50.00 | 1.19 | 4.00 | 0.48 July 17| 50.00 | 1.21 | 4.00 | 0.48 July 18| 50.00 | 1.19 | 3.99 | 0.50 July 19| 50.00 | 1.16 | 3.99 | 0.52 July 20| 50.00 | 1.16 | 3.99 | 0.56 July 21| 50.00 | 1.19 | 3.99 | 0.63 July 22| 50.00 | 1.20 | 3.99 | 0.77 July 23| 50.00 | 1.21 | 3.99 | 0.93 July 24| 50.00 | 1.38 | 3.99 | 1.07 July 25| 50.00 | 1.17 | 3.99 | 1.22 July 26| 50.00 | 1.07 | 4.00 | 1.37 July 27| 50.00 | 1.11 | 4.00 | July 28| 50.00 | 1.22 | 3.98 | 1.65 July 29| 50.00 | 1.21 | 4.00 | 1.82 July 30| 50.00 | 1.20 | 3.99 | 1.98 July 31| 50.00 | 1.20 | 3.99 | 2.11 --------+-----------+---------+-----------+--------- Aug. 1| 51.00 | 1.21 | 3.99 | 2.27 Aug. 2| 51.00 | 1.21 | 3.99 | 2.43 Aug. 3| 51.00 | 1.21 | 4.00 | 2.66 Aug. 4| 50.00 | 1.21 | 3.99 | 2.95 Aug. 5| 50.00 | 1.21 | 3.98 | 3.22 Aug. 6| 50.00 | 1.22 | 3.98 | 3.50 Aug. 7| 50.00 | 1.21 | 3.99 | 3.74 Aug. 8| 48.20 | 1.20 | ... | 4.09 Aug. 9| 50.00 | 1.18 | ... | 4.45 Aug. 10| 47.30 | 1.16 | ... | 4.67 Aug. 11| Shut down to drain and scrape sand filter; | O.9 in. depth over all. Aug. 16|Out of service all the rest of month washing | sponge and asbestos. --------+-----------+---------+-----------+--------- Sept. 3| 50.00 | 0.02 | 4.00 | 0.16 Sept. 4| 50.00 | 0.02 | 3.99 | 0.14 Sept. 5| 50.00 | 0.02 | 4.01 | 0.13 Sept. 6| 46.40 | 0.02 | 4.00 | 0.12 Sept. 7| 50.00 | 0.03 | 4.00 | 0.11 Sept. 8| 46.40 | 0.04 | 3.99 | 0.11 Sept. 9| 50.00 | 0.05 | 4.90 | 0.11 Sept. 10| 50.00 | 0.05 | 4.00 | 0.11 Sept. 11| 50.00 | 0.06 | 4.00 | 0.11 Sept. 12| 50.00 | 0.07 | 4.00 | 0.12 Sept. 13| 50.00 | 0.08 | 4.00 | 0.12 Sept. 14| 50.00 | 0.09 | 4.01 | 0.12 Sept. 15| 48.20 | 0.11 | 4.00 | 0.12 Sept. 16| 51.00 | 0.13 | 4.00 | 0.12 Sept. 17| 50.00 | 0.14 | 4.00 | 0.12 Sept. 18| 49.10 | 0.14 | 4.00 | 0.13 Sept. 19| 50.00 | 0.15 | 4.00 | 0.13 Sept. 20| 49.10 | 0.17 | 4.00 | 0.13 Sept. 21| 49.10 | 0.18 | 4.00 | 0.13 Sept. 22| 48.20 | 0.20 | 4.00 | 0.13 Sept. 23| 49.10 | 0.19 | 4.00 | 0.13 Sept. 24| 46.40 | 0.19 | 3.99 | 0.14 Sept. 25| 46.40 | 0.20 | 4.00 | 0.14 Sept. 26| 45.60 | 0.24 | 4.00 | 0.15 Sept. 27| 44.80 | 0.27 | 4.00 | 0.16 Sept. 28| 46.40 | 0.30 | 3.99 | 0.16 Sept. 29| 46.40 | 0.31 | 3.99 | 0.16 Sept. 30| 46.40 | 0.31 | 4.00 | 0.17 --------+-----------+---------+-----------+--------- Oct. 1| 48.20 | 0.33 | 4.00 | 0.18 Oct. 2| 50.00 | 0.33 | 4.01 | 0.19 Oct. 3| 48.20 | 0.33 | 4.00 | 0.19 Oct. 4| 48.20 | 0.34 | 4.00 | 0.19 Oct. 5| 50.00 | 0.38 | 4.00 | 0.19 Oct. 6| 48.20 | 0.41 | 4.00 | 0.19 Oct. 7| 48.20 | 0.42 | 4.00 | 0.19 Oct. 8| 50.00 | 0.42 | 4.00 | 0.19 Oct. 9| 44.80 | 0.40 | 4.00 | 0.19 Oct. 10| 48.20 | 0.42 | 4.00 | 0.19 Oct. 11| 48.20 | 0.43 | 4.00 | 0.20 |Washed. | | | Oct. 12| 50.00 | 0.14 | 4.00 | 0.20 Oct. 13| 47.30 | 0.15 | 4.00 | 0.21 Oct. 14| 50.00 | 0.18 | 4.00 | 0.22 Oct. 15| 53.00 | 0.20 | 4.00 | 0.23 Oct. 16| 50.00 | 0.20 | 4.00 | 0.24 Oct. 17| 50.00 | 0.21 | 4.00 | 0.25 Oct. 18| 50.00 | 0.21 | 4.00 | 0.25 Oct. 19| 50.00 | 0.21 | 4.00 | 0.25 Oct. 20| 50.00 | 0.22 | 4.00 | 0.25 Oct. 21| 50.00 | 0.23 | 4.00 | 0.25 Oct. 22| 50.00 | 0.24 | 4.00 | 0.26 Oct. 23| 50.00 | 0.25 | 4.00 | 0.26 Oct. 24| 50.00 | 0.26 | 4.00 | 0.26 Oct. 25| 50.00 | 0.27 | 4.00 | 0.27 Oct. 26| 50.00 | 0.28 | 4.00 | 0.27 Oct. 27| 50.00 | 0.29 | 4.00 | 0.27 Oct. 28| 50.00 | 0.30 | 4.00 | 0.27 Oct. 29| 50.00 | 0.31 | 4.00 | 0.27 Oct. 30| 50.00 | 0.32 | 4.00 | 0.27 Oct. 31|Out of commission. 4-in supply pipe stopped up. --------+-----------+---------+-----------+--------- Nov. 4| 50.00 | 0.16 | 4.00 | 0.28 Nov. 5| 50.00 | 0.17 | 4.00 | 0.28 Nov. 6| 50.00 | 0.18 | 4.00 | 0.29 Nov. 7| 50.00 | 0.20 | 4.00 | 0.30 Nov. 8| 50.00 | 0.21 | 4.00 | 0.32 Nov. 9| 50.00 | 0.22 | 4.00 | 0.34 Nov. 10| 50.00 | 0.23 | 4.00 | 0.36 Nov. 11| 50.00 | 0.24 | 3.46 | 0.38 Nov. 12| 50.00 | 0.26 | 3.99 | 0.40 Nov. 13| 50.00 | 0.27 | 4.00 | 0.44 Nov. 14| 50.00 | 0.28 | 4.00 | 0.49 Nov. 15| 50.00 | 0.29 | 4.00 | 0.55 Nov. 16| 50.00 | 0.30 | 4.00 | 0.65 Nov. 17| 50.00 | 0.31 | 3.98 | 0.80 Nov. 18| 50.00 | 0.32 | 3.99 | 0.98 Nov. 19| 50.00 | 0.34 | 3.99 | 1.26 Nov. 20| 50.00 | 0.35 | 3.98 | 1.64 Nov. 21| 50.00 | 0.36 | 3.99 | 2.03 Nov. 22| 50.00 | 0.37 | 3.98 | 2.33 Nov. 23| 50.00 | 0.38 | 3.99 | 2.60 Nov. 24| 50.00 | 0.40 | 3.98 | 2.85 Nov. 25| 48.20 | 0.45 | 3.98 | 3.10 Nov. 26| 50.00 | 0.49 | 3.98 | 3.62 Nov. 27| 50.00 | 0.51 | 3.99 | 4.15 Nov. 28| 50.00 | 0.54 | 3.84 | 4.44 Nov. 29| 50.00 | 0.55 | 3.67 | 4.55 Nov. 30| 50.00 | 0.56 | 3.44 | 4.65 --------+-----------+---------+-----------+--------- Dec. 2| Shut down to scrape sand filter. | Dec. 6| 50.00 | 0.64 | 4.00 | 0.46 Dec. 7| 50.00 | 0.64 | 4.00 | 0.39 Dec. 8| 50.00 | 0.64 | 4.01 | 0.35 Dec. 9| 50.00 | 0.65 | 4.01 | 0.33 Dec. 10| 50.00 | 0.65 | 4.00 | 0.33 Dec. 11| 47.30 | 0.64 | 4.00 | 0.35 Dec. 12| 46.40 | 0.70 | 3.98 | 0.39 Dec. 13| 50.00 | 0.79 | 3.98 | 0.49 Dec. 14| 52.00 | 0.84 | 3.97 | 0.65 Dec. 15| 49.10 | 0.84 | 3.98 | 0.77 Dec. 16| 49.10 | 0.86 | 3.97 | 0.84 Dec. 17| 49.10 | 0.88 | 3.98 | 0.91 Dec. 18| 48.20 | 0.89 | 3.98 | 0.94 Dec. 19| 50.00 | 0.91 | 3.98 | 0.97 Dec. 20| 49.10 | 0.92 | 3.98 | 1.03 Dec. 21| 50.00 | 0.94 | 3.98 | 1.08 Dec. 22| 50.00 | 0.97 | 3.98 | 1.13 Dec. 23| 50.00 | 0.95 | 3.98 | 1.19 Dec. 24| 47.30 | 0.93 | 3.98 | 1.28 Dec. 25| 44.10 | 0.91 | 3.97 | 1.47 Dec. 26| 46.40 | 1.01 | 3.97 | 1.63 Dec. 27| 50.00 | 1.11 | 3.98 | 1.81 Dec. 28| 48.20 | 1.12 | 3.99 | 1.87 Dec. 29| 50.00 | 1.14 | 3.99 | 1.85 Dec. 30| 49.10 | 1.15 | 3.98 | 1.86 Dec. 31| 50.00 | 1.17 | 4.00 | 1.87 --------+-----------+---------+-----------+--------- 1908. --------+-----------+---------+-----------+--------- Jan. 1| 50.00 | 1.18 | 3.98 | 1.90 Jan. 2| 50.00 | 1.18 | 3.99 | 1.94 Jan. 3| 50.00 | 1.19 | 3.98 | 1.98 |Washed. | | | Jan. 4| 50.00 | 0.17 | 3.97 | 2.09 Jan. 5| 50.00 | 0.18 | 3.98 | 2.22 Jan. 6| 50.00 | 0.19 | 3.98 | 2.28 Jan. 7| 50.00 | 0.20 | 3.98 | 2.37 Jan. 8| 50.00 | 0.21 | 3.99 | 2.43 Jan. 9| 50.00 | 0.23 | 3.98 | 2.52 Jan. 10| 50.00 | 0.24 | 3.99 | 2.66 Jan. 11| 50.00 | 0.27 | 3.98 | 2.74 Jan. 12| 50.00 | 0.28 | 3.98 | 2.83 Jan. 13| 49.10 | 0.30 | 3.98 | 2.93 Jan. 14| 48.20 | 0.33 | 3.99 | 3.04 Jan. 15| 46.40 | 0.35 | 3.98 | 3.21 Jan. 16| 50.00 | 0.40 | 3.98 | 3.49 Jan. 17| 50.00 | 0.43 | 3.98 | 3.86 Jan. 18| 50.00 | 0.46 | 3.91 | 3.99 Jan. 19| ... | ... | ... | ... Jan. 20| Scraped. | | | Jan. 21| 50.00 | 0.48 | 3.00 | 0.76 Jan. 22| 50.00 | 0.48 | 3.01 | 0.60 Jan. 23| 50.00 | 0.49 | 3.00 | 0.57 Jan. 24| 50.00 | 0.49 | 2.99 | 0.60 Jan. 25| 50.00 | 0.50 | 2.99 | 0.65 Jan. 26| 50.00 | 0.50 | 2.98 | 0.69 Jan. 27| 50.00 | 0.51 | 2.99 | 0.76 Jan. 28| 50.00 | 0.52 | 2.99 | 0.82 Jan. 29| 50.00 | 0.55 | 2.99 | 0.90 Jan. 30| 50.00 | 0.57 | 2.98 | 0.98 Jan. 31| 50.00 | 0.58 | 2.98 | 1.08 --------+-----------+---------+-----------+--------- Feb. 1| 50.00 | 0.59 | 2.99 | 1.16 Feb. 2| 49.10 | 0.60 | 2.99 | 1.22 Feb. 3| 49.10 | 0.61 | 2.98 | 1.30 Feb. 4| 50.00 | 0.64 | 2.99 | 1.40 Feb. 5| 50.00 | 0.66 | 2.99 | 1.50 Feb. 6| 50.00 | 0.67 | 2.99 | 1.55 Feb. 7| 50.00 | 0.68 | 3.00 | 1.56 Feb. 8| 50.00 | 0.69 | 3.00 | 1.53 Feb. 9| 50.00 | 0.71 | 3.00 | 1.54 Feb. 10| 50.00 | 0.72 | 2.99 | 1.60 Feb. 11| 50.00 | 0.74 | 2.99 | 1.62 Feb. 12| 50.00 | 0.75 | 2.98 | 1.68 Feb. 13| 50.00 | 0.76 | 2.99 | 1.74 Feb. 14| 48.20 | 0.76 | 2.99 | 1.77 Feb. 15| 51.80 | 0.79 | 2.99 | 1.89 Feb. 16| 48.20 | 0.79 | 2.99 | 2.08 Feb. 17| 48.20 | 0.81 | 2.99 | 2.24 Feb. 18| 47.30 | 0.82 | 2.99 | 2.31 Feb. 19| 51.80 | 0.92 | 2.99 | 2.45 Feb. 20| 52.70 | 0.99 | 2.99 | 2.61 Feb. 21| 51.80 | 1.03 | 2.99 | 2.68 Feb. 22| 50.90 | 1.07 | 2.99 | 2.72 Feb. 23| 50.00 | 1.09 | 2.99 | 2.76 Feb. 24| 51.80 | 1.12 | 2.99 | 2.80 Feb. 25| 50.00 | 1.14 | 2.99 | 2.84 Feb. 26| 50.00 | 1.17 | 3.00 | 2.87 Feb. 27| 48.20 | 1.18 | 2.99 | 2.90 Feb. 28| 47.30 | 1.19 | 2.99 | 2.94 Feb. 29| 51.80 | 1.23 | 2.99 | 3.01 --------+-----------+---------+-----------+--------- Mar. 1| 48.20 | 1.20 | 2.98 | 2.99 Mar. 2| 50.00 | 1.28 | 2.99 | 3.12 Mar. 3| 50.90 | 1.32 | 2.98 | 3.22 Mar. 4| 50.00 | 1.33 | 2.99 | 3.28 Mar. 5| 50.00 | 1.35 | 2.99 | 3.32 Mar. 6| Discontinued; sand filter being used | for sedimentation experiments. ========+===========+=========+===========+=========