WATER PURIFICATION PLANT, WASHINGTON, D. C. RESULTS OF OPERATION.1 (continued 2)
Reading edition
June 6 241 155 82 48 16 3.00 0.56 27 3 1 ... ... ...
June 7 241 155 82 48 16 2.99 0.53 22 2 1 ... ... ...
June 8 241 155 82 48 16 3.00 0.49 20 1 1 ... ... ...
June 9 241 155 82 48 16 2.99 0.46 20 1 1 ... ... ...
June 10 241 155 82 48 16 3.00 0.44 17 1 1 ... ... ...
June 11 331 212 112 66 22 2.98 0.42 12 1 1 ... ... ...
June 12 318 204 108 64 22 2.98 0.42 11 1 1 ... ... ...
June 13 265 170 90 53 18 3.00 0.40 36 3 1 ... ... ...
June 14 252 162 86 50 17 2.99 0.40 39 5 1 ... ... ...
June 15 241 155 82 48 16 2.99 0.39 25 3 1 ... ... ...
June 16 241 155 82 48 16 2.99 0.40 34 3 1 ... ... ...
June 17 252 162 86 50 17 2.99 0.41 64 11 1 ... ... ...
June 18 241 155 82 48 16 2.99 0.42 57 11 1 ... ... ...
June 19 241 155 82 48 16 2.99 0.42 46 8 1 ... ... ...
June 20 241 155 82 48 16 2.99 0.42 40 5 1 ... ... ...
June 21 241 155 82 48 16 3.00 0.43 28 4 1 ... ... ...
June 22 241 155 82 48 16 2.99 0.43 25 3 1 ... ... ...
June 23 241 155 82 48 16 2.99 0.43 25 3 1 ... ... ...
June 24 241 155 82 48 16 2.99 0.43 29 4 1 ... ... ...
June 25 241 155 82 48 16 2.99 0.43 18 2 1 ... ... ...
June 26 241 155 82 48 16 2.80 0.42 15 1 1 ... ... ...
June 27 241 155 82 48 16 2.99 0.44 12 1 1 ... ... ...
June 28 241 155 82 48 16 2.99 0.44 9 1 1 ... ... ...
June 29 241 155 82 48 16 2.99 0.44 8 1 1 ... ... ...
June 30 241 155 82 48 16 2.99 0.44 10 1 1 ... ... ...
July 1 241 155 82 48 16 3.00 0.45 8 1 1 80 10 4
July 2 241 155 82 48 16 3.00 0.46 8 1 0 290 24 5
July 3 241 155 82 48 16 3.00 0.47 8 1 0 350 45 6
July 4 241 155 82 48 16 2.99 0.49 9 1 0 ... ... ...
July 5 305 195 103 61 21 3.00 0.51 10 1 0 ... ... ...
July 6 241 155 82 48 16 3.00 0.51 9 1 0 300 36 7
July 7 241 155 82 48 16 2.99 0.53 8 1 0 110 10 3
July 8 252 162 86 50 17 3.00 0.53 9 1 0 85 22 2
July 9 241 155 82 48 16 3.00 0.54 8 1 0 85 26 2
July 10 ... ... ... ... ... ... ... ... ... ... 200 3 5
July 11 305 195 103 61 21 3.00 0.56 12 1 0 145 7 3
July 12 241 155 82 48 16 2.99 0.58 11 1 0 ... ... ...
July 13 241 155 82 48 16 3.00 0.60 10 1 0 115 34 55
July 14 241 155 82 48 16 2.99 0.62 16 1 0 300 55 30
July 15 241 155 82 48 16 2.99 0.64 17 1 0 180 32 23
July 16 241 155 82 48 16 3.00 0.67 13 1 0 100 115 3
July 17 241 155 82 48 16 2.99 0.71 10 1 0 65 275 5
July 18 241 155 82 48 16 2.99 0.73 11 1 0 38 425 10
July 19 241 155 82 48 16 3.00 0.76 12 1 0 ... ... ...
July 20 241 155 82 48 16 2.99 0.79 10 1 0 95 90 70
July 21 252 162 86 50 17 2.99 0.83 10 1 1 70 17 4
July 22 241 155 82 48 16 2.99 0.87 13 1 1 440 8 5
July 23 305 195 103 61 21 2.99 0.92 54 4 1 650 26 5
July 24 331 212 111 66 22 2.98 0.99 305 61 1 1,650 ... ...
July 25 265 170 90 53 18 2.98 1.08 330 85 1 2,600 115 15
July 26 252 162 86 50 17 2.98 1.21 290 77 2 ... ... ...
July 27 305 195 103 61 21 2.98 1.40 335 87 2 35,000 250 ...
July 28 252 162 86 50 17 2.98 1.68 170 52 2 1,200 1,350 15
July 29 252 162 86 50 17 2.97 2.14 180 52 2 2,000 600 13
July 30 252 162 86 50 17 2.97 2.65 237 56 2 800 1,300 12
July 31 241 155 82 48 16 2.95 3.01 250 60 2 1,000 310 7
Table 18—Record of Experimental Filter Plant No. 2.
Date. Preliminary Filter. Final Filter. Turbidity Bacteria
Rate, millions of gallons per acre daily. Loss of head. Rate, millions of gallons per acre daily. Loss of head. Applied water. Effluent preliminary filter. Effluent final filter. Applied water. Effluent preliminary filter. Effluent final filter.
1907.
Feb. 8 21.50 0.04 2.81 0.17 ... ... ... 1,100 2,100 ...
Feb. 9 21.60 0.04 1.09 0.06 ... ... ... 200 550 2,100
Feb. 10 20.90 0.05 1.59 0.08 ... ... ... ... ... ...
Feb. 11 19.80 0.05 3.01 0.15 12 6 2 600 1,160 1,100
Feb. 12 19.70 0.06 3.01 0.14 12 5 2 650 400 700
Feb. 13 19.60 0.06 3.01 0.12 15 5 2 660 900 700
Feb. 14 24.70 0.07 2.65 0.13 15 6 2 650 1,100 900
Feb. 15 37.20 ... 3.40 0.12 12 5 2 600 800 850
Feb. 16 37.30 ... 3.40 0.11 14 4 2 850 950 600
Feb. 17 Shut down for changes in meters and piping.
Feb. 18 ... ... ... ... ... ... ... 1,200 ... 600
Feb. 21 44.50 ... 4.36 0.19 20 6 2 1,800 1,400 800
Feb. 22 48.60 ... 4.37 0.16 15 4 2 Holiday.
Feb. 23 48.40 ... 4.20 0.15 20 7 2 1,600 750 380
Feb. 24 48.30 ... 4.02 0.13 20 10 3 Sunday.
Feb. 25 Shut down several hours. 0.14 20 10 3 1,400 1,000 450
Feb. 26 48.60 0.04 4.12 0.14 20 10 3 700 800 260
Feb. 27 53.20 0.04 4.08 0.15 17 8 3 700 700 290
Feb. 28 52.80 0.04 4.09 0.15 15 8 3 800 650 500
Mar. 1 53.00 0.04 4.10 0.16 15 8 3 650 550 200
Mar. 2 53.30 0.04 4.11 0.16 15 7 3 1,000 800 300
Mar. 3 50.60 0.05 4.11 0.16 31 11 3 Sunday.
Mar. 4 42.40 0.05 4.12 0.17 35 15 6 1,200 1,500 360
Mar. 5 42.70 0.05 4.11 0.17 135 52 10 13,000 850 ...
Mar. 6 48.60 0.07 4.13 0.17 135 54 12 18,000 8,000 ...
Mar. 7 50.50 0.08 4.12 0.18 102 46 8 24,000 6,500 1,800
Mar. 8 51.80 0.09 4.12 0.18 100 40 6 22,000 6,000 1,600
Mar. 9 53.00 0.10 4.12 0.18 90 40 5 24,000 6,000 800
Mar. 10 54.40 0.12 4.11 0.19 82 39 6 Sunday.
Mar. 11 51.00 0.12 4.12 0.19 68 32 7 18,000 4,300 240
Mar. 12 51.20 0.12 4.07 0.19 46 25 5 11,000 4,600 210
Mar. 13 50.50 0.12 4.00 0.19 40 20 5 9,000 1,500 200
Mar. 14 46.50 0.12 ... 0.20 39 20 4 5,500 1,200 90
Mar. 15 45.80 0.12 3.98 0.20 35 18 4 6,500 1,100 150
Mar. 16 42.50 0.12 3.97 0.19 60 24 4 5,000 800 160
Mar. 17 49.30 0.14 3.98 0.19 135 45 5 Sunday.
Mar. 18 52.60 0.16 3.98 0.20 170 59 9 9,000 1,700 100
Mar. 19 53.50 0.17 4.01 0.19 125 51 8 7,000 1,000 120
Mar. 20 52.90 0.17 3.99 0.18 102 40 6 4,800 700 75
Mar. 21 48.20 0.16 4.00 0.19 125 42 5 8,500 1,100 90
Mar. 22 51.80 0.18 4.01 0.20 190 82 5 7,500 1,100 55
Mar. 23 51.60 0.19 4.01 0.20 180 75 6 7,500 1,300 90
Mar. 24 48.20 0.17 4.01 0.20 140 68 7 Sunday.
Mar. 25 48.50 0.18 4.01 0.20 88 40 5 4,400 900 75
Mar. 26 45.90 0.18 3.98 0.20 62 32 4 3,600 750 90
Mar. 27 50.50 0.20 4.04 0.20 47 25 4 2,200 400 60
Mar. 28 49.60 0.20 3.92 0.19 35 16 3 1,300 350 55
Mar. 29 42.20 0.17 3.98 0.19 26 12 3 700 180 20
Mar. 30 48.00 0.22 4.01 0.19 25 7 3 310 220 39
Mar. 31 49.10 0.22 3.99 0.20 21 6 2 Sunday.
April 1 49.10 0.24 4.00 0.20 20 6 2 600 110 38
April 2 49.70 0.25 4.00 0.20 24 6 2 270 110 29
April 3 51.40 0.27 4.00 0.21 24 6 2 460 85 31
April 4 48.70 0.27 4.00 0.22 20 6 2 280 60 22
April 5 48.10 0.27 4.00 0.22 20 5 2 450 70 40
April 6 Shut down awaiting Mr. Maiguen to apply bone-charcoal.
April 7 Removed 1.06 in. of sand. Sunday.
April 8 52.20 0.33 4.05 0.27 18 4 3 330 ... ...
April 9 46.90 0.29 4.02 0.29 18 4 2 140 60 32
April 10 47.60 0.31 4.03 0.28 30 4 1 750 120 28
April 11 46.00 0.30 4.04 0.28 66 7 2 4,000 ... 32
April 12 45.40 0.31 4.03 0.29 72 20 3 14,000 2,900 85
April 13 45.10 0.32 3.99 0.32 80 30 3 13,000 2,500 95
April 14 49.00 0.34 4.00 0.32 77 35 4 Sunday.
April 15 47.80 0.35 3.99 0.33 62 31 4 7,000 1,100 60
April 16 47.40 0.36 3.99 0.34 47 27 4 3,600 650 31
April 17 45.60 0.36 4.00 0.34 39 21 3 1,600 160 38
April 18 45.70 0.36 4.00 0.34 30 13 2 1,810 210 42
April 19 45.60 0.37 4.00 0.34 25 9 2 790 190 34
April 20 45.30 0.40 4.00 0.36 20 6 2 540 87 23
April 21 47.20 0.44 3.99 0.38 20 4 2 Sunday.
April 22 45.20 0.42 3.99 0.38 18 3 1 235 55 22
April 23 44.90 0.44 4.05 0.40 15 3 1 170 45 16
April 24 40.50 0.41 4.02 0.44 19 2 1 150 14 14
April 25 39.60 0.41 4.03 0.45 34 3 1 700 12 23
April 26 40.70 0.44 4.05 0.45 46 4 1 1,200 80 16
April 27 39.30 0.44 4.00 0.44 52 4 1 1,700 160 23
April 28 34.70 0.43 4.05 0.44 45 5 1 Sunday.
April 29 37.20 0.45 4.00 0.42 44 6 1 600 60 10
April 30 43.00 0.49 4.00 0.41 39 7 1 550 55 15
May 1 41.30 0.49 4.00 0.41 31 6 1 500 80 17
May 2 42.40 0.49 4.00 0.41 24 5 1 500 80 19
May 3 40.70 0.48 4.00 0.40 19 4 1 280 75 48
May 4 33.80 0.47 4.00 0.39 16 3 1 400 80 9
May 5 26.20 0.43 4.00 0.39 15 1 1 Sunday.
May 6 29.00 0.38 3.99 0.37 13 2 1 390 100 65
May 7 27.60 0.36 ... 0.37 12 2 1 190 60 19
May 8 24.70 0.31 3.99 0.37 10 2 1 ... ... ...
Washed.
May 9 24.40 0.03 3.98 0.39 10 2 1 390 65 10
May 10 24.80 0.04 4.00 0.42 10 2 1 300 80 18
May 11 50.00 0.06 4.00 0.44 12 2 1 390 110 12
May 12 50.00 0.08 4.00 0.48 17 2 1 Sunday.
May 13 50.00 0.09 4.00 0.47 35 3 1 600 100 18
May 14 50.00 0.10 4.00 0.46 39 4 1 500 65 15
May 15 48.50 0.15 4.00 0.45 17 3 1 500 70 16
May 16 47.00 0.16 4.00 0.46 24 3 1 290 70 16
May 17 47.00 0.16 3.99 0.47 18 3 1 260 40 9
May 18 47.00 0.19 4.00 0.48 15 2 1 190 ... 17
May 19 47.00 0.21 3.99 0.51 12 2 1 Sunday.
May 20 46.60 0.24 4.00 0.53 12 2 1 260 40 13
May 21 46.40 0.24 4.00 0.55 16 2 1 260 65 9
May 22 46.40 0.27 4.00 0.58 20 2 1 280 35 12
May 23 46.40 0.29 4.00 0.61 15 2 1 130 35 10
May 24 46.40 0.30 4.00 0.63 15 2 1 170 26 6
May 25 46.40 0.32 4.00 0.66 15 2 1 340 80 13
May 26 46.40 0.34 3.99 0.70 18 2 1 Sunday.
May 27 46.40 0.86 3.99 0.74 13 2 1 210 80 7
May 28 46.40 0.38 3.15 0.76 16 2 1 260 70 10
May 29 46.00 0.44 3.88 0.78 16 2 1 500 55 12
May 30 45.60 0.46 3.99 0.86 14 2 1 Holiday.
May 31 45.60 0.46 4.00 0.92 17 2 1 380 65 11
June 1 45.60 0.46 4.00 0.98 15 2 1 900 48 10
June 2 45.60 0.48 4.00 1.09 17 2 1 Sunday.
June 3 45.60 0.51 4.00 1.20 24 2 1 550 75 16
June 4 45.60 0.54 4.00 1.32 37 3 1 6,500 ... 22
June 5 45.60 0.55 4.00 1.48 65 5 1 3,200 140 19
June 6 45.60 0.56 4.01 3.66 77 16 1 1,500 210 14
June 7 45.00 0.57 4.00 1.80 64 27 1 2,100 230 20
June 8 45.00 0.57 4.00 1.90 46 22 1 600 240 33
June 9 45.00 0.55 4.01 2.00 44 18 1 Sunday.
June 10 45.00 0.56 4.00 2.09 36 12 1 240 110 43
June 11 45.00 0.58 4.00 2.17 30 8 1 280 130 60
June 12 45.00 0.60 4.01 2.27 34 8 1 330 150 60
June 13 45.00 0.62 4.00 2.36 35 10 1 480 ... 120
June 14 45.00 0.63 3.99 2.49 31 9 1 440 ... 65
June 15 45.00 0.64 3.99 2.56 32 8 1 420 ... 49
June 16 44.70 0.65 4.00 2.63 26 7 1 Sunday.
June 17 44.40 0.64 4.00 2.67 26 6 1 340 270 55
June 18 45.00 0.63 3.98 2.69 31 7 1 440 140 65
June 19 45.00 0.63 4.00 2.73 37 10 1 500 110 24
June 20 45.00 0.62 4.01 2.72 30 9 1 330 70 34
June 21 45.00 0.61 4.01 2.68 25 7 1 170 130 60
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 0.27 130 45 1 400 ... ...
June 26 50.00 0.57 4.01 0.46 82 37 1 750 550 35
June 27 50.00 0.63 4.01 0.55 65 26 1 ... 1,200 140
June 28 50.00 0.65 3.99 0.63 47 21 1 ... 1,200 26
June 29 50.00 0.70 4.00 0.73 37 9 1 220 800 22
June 30 50.00 0.77 3.99 0.82 30 8 1 Sunday.
July 1 50.00 0.87 4.00 0.80 30 8 1 400 90 37
July 2 50.00 0.95 4.01 0.73 32 9 1 180 230 25
July 3 50.00 1.01 4.00 0.66 36 10 1 350 80 58
July 4 50.00 1.03 4.00 0.58 44 12 1 Holiday.
July 5 50.00 1.07 3.99 0.54 24 14 1 550 130 47
July 6 50.00 1.10 4.00 0.52 39 12 1 250 110 33
July 7 50.00 1.14 4.00 0.50 34 10 1 Sunday.
July 8 50.00 1.16 4.00 0.48 25 7 1 220 190 14
July 9 50.00 1.18 4.00 0.46 22 5 1 50 30 3
July 10 50.00 1.20 3.99 0.45 47 11 1 Lost. Lost. Lost.
July 11 50.00 1.20 3.99 0.45 90 30 1 150 140 12
July 12 50.00 1.20 4.01 0.44 97 35 1 300 110 20
July 13 50.00 1.15 4.00 0.47 90 39 1 220 120 14
July 14 50.00 1.15 4.00 0.48 90 40 1 Sunday.
July 15 50.00 1.14 3.99 0.48 95 40 1 375 320 19
July 16 50.00 1.19 4.00 0.48 120 45 1 Lost. 150 12
July 17 50.00 1.21 4.00 0.48 85 42 1 270 60 5
July 18 50.00 1.19 3.99 0.50 56 32 1 1,675 23 39
July 19 50.00 1.16 3.99 0.52 41 20 1 450 200 13
July 20 50.00 1.16 3.99 0.56 62 29 1 300 220 8
July 21 50.00 1.19 3.99 0.63 62 31 1 Sunday.
July 22 50.00 1.20 3.99 0.77 80 36 1 1,400 70 9
July 23 50.00 1.21 3.99 0.93 105 40 1 3,700 370 25
July 24 50.00 1.38 3.99 1.07 95 40 1 770 260 31
July 25 50.00 1.17 3.99 1.22 77 32 1 250 230 3
July 26 50.00 1.07 4.00 1.37 67 29 1 140 90 12
July 27 50.00 1.11 4.00 54 25 1 300 180 6
July 28 50.00 1.22 3.98 1.65 46 19 1 Sunday.
July 29 50.00 1.21 4.00 1.82 36 16 1 470 230 18
July 30 50.00 1.20 3.99 1.98 29 11 1 Plates lost.
July 31 50.00 1.20 3.99 2.11 21 9 1 Plates lost.
Aug. 1 51.00 1.21 3.99 2.27 16 6 1 Plates lost.
Aug. 2 51.00 1.21 3.99 2.43 15 4 1 130 130 4
Aug. 3 51.00 1.21 4.00 2.66 16 3 1 120 80 4
Aug. 4 50.00 1.21 3.99 2.95 21 3 1 Sunday.
Aug. 5 50.00 1.21 3.98 3.22 29 3 1 230 210 4
Aug. 6 50.00 1.22 3.98 3.50 34 4 1 85 320 19
Aug. 7 50.00 1.21 3.99 3.74 21 4 1 200 Lost. 19
Aug. 8 48.20 1.20 ... 4.09 19 4 1 100 150 17
Aug. 9 50.00 1.18 ... 4.45 16 3 1 75 220 9
Aug. 10 47.30 1.16 ... 4.67 24 3 1 60 250 10
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 12 5 1 300 ... ...
Sept. 4 50.00 0.02 3.99 0.14 16 6 1 600 260 370
Sept. 5 50.00 0.02 4.01 0.13 34 6 1 360 71 165
Sept. 6 46.40 0.02 4.00 0.12 160 52 1 15,000 1,900 120
Sept. 7 50.00 0.03 4.00 0.11 64 26 1 2,000 170 62
Sept. 8 46.40 0.04 3.99 0.11 56 25 1 Sunday.
Sept. 9 50.00 0.05 4.90 0.11 59 25 1 220 13 19
Sept. 10 50.00 0.05 4.00 0.11 57 21 1 18,000 100 24
Sept. 11 50.00 0.06 4.00 0.11 65 25 1 2,700 150 25
Sept. 12 50.00 0.07 4.00 0.12 72 26 1 1,000 190 36
Sept. 13 50.00 0.08 4.00 0.12 87 30 1 2,300 ... 35
Sept. 14 50.00 0.09 4.01 0.12 72 27 1 2,400 130 230
Sept. 15 48.20 0.11 4.00 0.12 65 25 1 Sunday.
Sept. 16 51.00 0.13 4.00 0.12 65 25 1 Lost. Lost. 27
Sept. 17 50.00 0.14 4.00 0.12 52 21 1 420 60 29
Sept. 18 49.10 0.14 4.00 0.13 60 18 1 900 80 41
Sept. 19 50.00 0.15 4.00 0.13 85 22 1 2,000 ... 19
Sept. 20 49.10 0.17 4.00 0.13 100 29 1 4,200 300 28
Sept. 21 49.10 0.18 4.00 0.13 120 34 1 1,100 160 30
Sept. 22 48.20 0.20 4.00 0.13 137 41 1 Sunday.
Sept. 23 49.10 0.19 4.00 0.13 112 37 1 2,400 90 34
Sept. 24 46.40 0.19 3.99 0.14 100 35 1 4,000 210 12
Sept. 25 46.40 0.20 4.00 0.14 432 80 1 56,000 510 27
Sept. 26 45.60 0.24 4.00 0.15 385 80 4 1,300 450 55
Sept. 27 44.80 0.27 4.00 0.16 245 70 3 4,000 240 41
Sept. 28 46.40 0.30 3.99 0.16 127 46 2 15,000 430 37
Sept. 29 46.40 0.31 3.99 0.16 105 41 2 Sunday.
Sept. 30 46.40 0.31 4.00 0.17 115 42 1 Lost. 1,600 110
Oct. 1 48.20 0.33 4.00 0.18 82 36 1 600 600 120
Oct. 2 50.00 0.33 4.01 0.19 65 27 1 4,400 170 47
Oct. 3 48.20 0.33 4.00 0.19 59 34 1 900 210 44
Oct. 4 48.20 0.34 4.00 0.19 55 20 1 850 200 37
Oct. 5 50.00 0.38 4.00 0.19 9 21 1 2,000 150 34
Oct. 6 48.20 0.41 4.00 0.19 59 24 1 Sunday.
Oct. 7 48.20 0.42 4.00 0.19 552 17 1 1,250 200 28
Oct. 8 50.00 0.42 4.00 0.19 54 16 1 11,000 210 28
Oct. 9 44.80 0.40 4.00 0.19 51 16 1 2,000 310 29
Oct. 10 48.20 0.42 4.00 0.19 50 15 1 800 220 16
Oct. 11 48.20 0.43 4.00 0.20 47 13 1 2,000 310 46
Washed.
Oct. 12 50.00 0.14 4.00 0.20 36 11 1 1,200 370 25
Oct. 13 47.30 0.15 4.00 0.21 40 15 1 Sunday.
Oct. 14 50.00 0.18 4.00 0.22 47 19 1 1,200 390 22
Oct. 15 53.00 0.20 4.00 0.23 41 16 1 900 140 16
Oct. 16 50.00 0.20 4.00 0.24 35 12 1 Lost. 310 18
Oct. 17 50.00 0.21 4.00 0.25 30 8 1 550 180 7
Oct. 18 50.00 0.21 4.00 0.25 25 6 1 260 100 33
Oct. 19 50.00 0.21 4.00 0.25 25 6 1 750 220 15
Oct. 20 50.00 0.22 4.00 0.25 20 5 1 Sunday.
Oct. 21 50.00 0.23 4.00 0.25 19 5 1 480 120 11
Oct. 22 50.00 0.24 4.00 0.26 18 4 1 230 70 7
Oct. 23 50.00 0.25 4.00 0.26 15 3 1 250 120 12
Oct. 24 50.00 0.26 4.00 0.26 15 3 1 300 80 12
Oct. 25 50.00 0.27 4.00 0.27 15 2 1 450 60 15
Oct. 26 50.00 0.28 4.00 0.27 15 2 1 450 Lost. 14
Oct. 27 50.00 0.29 4.00 0.27 13 2 0 Sunday.
Oct. 28 50.00 0.30 4.00 0.27 13 2 0 190 110 9
Oct. 29 50.00 0.31 4.00 0.27 25 2 0 380 ... ...
Oct. 30 50.00 0.32 4.00 0.27 21 3 0 ... ... ...
Oct. 31 Out of commission. 4-in supply pipe stopped up.
Nov. 4 50.00 0.16 4.00 0.28 125 11 1 ... ... ...
Nov. 5 50.00 0.17 4.00 0.28 185 61 1 6,000 3,000 220
Nov. 6 50.00 0.18 4.00 0.29 170 66 1 5,000 1,100 150
Nov. 7 50.00 0.20 4.00 0.30 100 45 1 14,000 1,600 120
Nov. 8 50.00 0.21 4.00 0.32 95 42 1 1,900 2,000 29
Nov. 9 50.00 0.22 4.00 0.34 80 36 1 4,000 2,000 110
Nov. 10 50.00 0.23 4.00 0.36 67 29 1 Sunday.
Nov. 11 50.00 0.24 3.46 0.38 52 20 1 1,900 460 160
Nov. 12 50.00 0.26 3.99 0.40 40 13 1 7,500 1,100 110
Nov. 13 50.00 0.27 4.00 0.44 36 10 1 1,600 550 50
Nov. 14 50.00 0.28 4.00 0.49 42 13 1 2,700 950 48
Nov. 15 50.00 0.29 4.00 0.55 35 11 1 1,800 900 49
Nov. 16 50.00 0.30 4.00 0.65 26 7 1 1,100 360 35
Nov. 17 50.00 0.31 3.98 0.80 20 5 1 Sunday.
Nov. 18 50.00 0.32 3.99 0.98 17 4 1 1,600 200 35
Nov. 19 50.00 0.34 3.99 1.26 16 3 1 1,300 400 55
Nov. 20 50.00 0.35 3.98 1.64 45 4 1 6,500 3,500 200
Nov. 21 50.00 0.36 3.99 2.03 52 12 1 9,900 4,500 130
Nov. 22 50.00 0.37 3.98 2.33 65 24 1 10,000 5,500 220
Nov. 23 50.00 0.38 3.99 2.60 49 19 1 18,000 3,500 100
Nov. 24 50.00 0.40 3.98 2.85 134 32 1 Sunday.
Nov. 25 48.20 0.45 3.98 3.10 225 87 2 50,000 19,000 340
Nov. 26 50.00 0.49 3.98 3.62 237 90 2 40,000 11,000 220
Nov. 27 50.00 0.51 3.99 4.15 185 77 2 16,000 7,500 310
Nov. 28 50.00 0.54 3.84 4.44 130 57 2 Holiday.
Nov. 29 50.00 0.55 3.67 4.55 80 36 1 10,000 2,200 80
Nov. 30 50.00 0.56 3.44 4.65 54 25 1 3,800 2,200 55
Dec. 2 Shut down to scrape sand filter.
Dec. 6 50.00 0.64 4.00 0.46 16 3 1 --- --- ---
Dec. 7 50.00 0.64 4.00 0.39 14 3 1 2,400 1,200 490
Dec. 8 50.00 0.64 4.01 0.35 12 2 1 Sunday.
Dec. 9 50.00 0.65 4.01 0.33 11 2 1 1,200 420 60
Dec. 10 50.00 0.65 4.00 0.33 12 2 1 800 950 66
Dec. 11 47.30 0.64 4.00 0.35 255 84 3 6,500 1,600 140
Dec. 12 46.40 0.70 3.98 0.39 212 100 6 48,000 15,000 1,800
Dec. 13 50.00 0.79 3.98 0.49 495 217 9 42,000 20,000 1,600
Dec. 14 52.00 0.84 3.97 0.65 357 167 9 49,000 9,500 1,200
Dec. 15 49.10 0.84 3.98 0.77 157 76 6 Sunday.
Dec. 16 49.10 0.86 3.97 0.84 90 42 4 19,000 800 700
Dec. 17 49.10 0.88 3.98 0.91 70 31 2 21,000 18,000 1,600
Dec. 18 48.20 0.89 3.98 0.94 49 21 2 6,500 7,000 600
Dec. 19 50.00 0.91 3.98 0.97 39 13 1 Lost. Lost. Lost.
Dec. 20 49.10 0.92 3.98 1.03 42 16 1 " " "
Dec. 21 50.00 0.94 3.98 1.08 26 7 1 " " "
Dec. 22 50.00 0.97 3.98 1.13 20 5 1 Sunday.
Dec. 23 50.00 0.95 3.98 1.19 34 9 1 1,400 500 160
Dec. 24 47.30 0.93 3.98 1.28 195 75 2 9,000 1,700 130
Dec. 25 44.10 0.91 3.97 1.47 445 210 9 Holiday.
Dec. 26 46.40 1.01 3.97 1.63 370 172 7 51,000 8,000 250
Dec. 27 50.00 1.11 3.98 1.81 245 110 5 55,000 5,600 210
Dec. 28 48.20 1.12 3.99 1.87 102 46 3 10,000 4,500 140
Dec. 29 50.00 1.14 3.99 1.85 75 32 2 Sunday.
Dec. 30 49.10 1.15 3.98 1.86 56 24 2 4,400 1,900 190
Dec. 31 50.00 1.17 4.00 1.87 39 15 1 14,000 1,300 60
1908.
Jan. 1 50.00 1.18 3.98 1.90 31 8 1 ... ... ...
Jan. 2 50.00 1.18 3.99 1.94 39 11 1 4,400 750 45
Jan. 3 50.00 1.19 3.98 1.98 36 11 1 3,100 1,600 70
Washed.
Jan. 4 50.00 0.17 3.97 2.09 32 9 1 2,400 1,200 43
Jan. 5 50.00 0.18 3.98 2.22 26 6 1 Sunday.
Jan. 6 50.00 0.19 3.98 2.28 20 5 1 600 600 49
Jan. 7 50.00 0.20 3.98 2.37 20 5 1 1,100 330 49
Jan. 8 50.00 0.21 3.99 2.43 22 5 1 1,900 900 43
Jan. 9 50.00 0.23 3.98 2.52 45 13 1 13,000 3,400 50
Jan. 10 50.00 0.24 3.99 2.66 70 30 1 10,000 8,000 50
Jan. 11 50.00 0.27 3.98 2.74 56 22 1 16,000 220 200
Jan. 12 50.00 0.28 3.98 2.83 40 12 1 Sunday.
Jan. 13 49.10 0.30 3.98 2.93 110 51 2 8,500 1,200 43
Jan. 14 48.20 0.33 3.99 3.04 210 113 4 16,000 6,000 280
Jan. 15 46.40 0.35 3.98 3.21 325 222 15 24,000 9,500 700
Jan. 16 50.00 0.40 3.98 3.49 360 247 42 28,000 14,000 900
Jan. 17 50.00 0.43 3.98 3.86 242 147 26 65,000 20,000 1,200
Jan. 18 50.00 0.46 3.91 3.99 137 73 7 7,000 6,500 400
Jan. 19 ... ... ... ... ... ... ... Sunday.
Jan. 20 Scraped.
Jan. 21 50.00 0.48 3.00 0.76 55 25 4 ... ... ...
Jan. 22 50.00 0.48 3.01 0.60 49 21 4 3,600 1,900 150
Jan. 23 50.00 0.49 3.00 0.57 40 15 3 1,800 700 170
Jan. 24 50.00 0.49 2.99 0.60 40 13 3 2,300 950 90
Jan. 25 50.00 0.50 2.99 0.65 39 12 3 1,100 800 95
Jan. 26 50.00 0.50 2.98 0.69 32 9 2 Sunday.
Jan. 27 50.00 0.51 2.99 0.76 32 9 2 300 700 70
Jan. 28 50.00 0.52 2.99 0.82 45 15 2 1,200 900 70
Jan. 29 50.00 0.55 2.99 0.90 60 26 2 1,000 1,400 95
Jan. 30 50.00 0.57 2.98 0.98 57 27 2 1,400 210 33
Jan. 31 50.00 0.58 2.98 1.08 42 18 2 1,100 750 45
Feb. 1 50.00 0.59 2.99 1.16 39 14 2 750 1,000 70
Feb. 2 49.10 0.60 2.99 1.22 27 9 2 Sunday.
Feb. 3 49.10 0.61 2.98 1.30 29 8 2 1,300 750 20
Feb. 4 50.00 0.64 2.99 1.40 25 6 2 600 900 60
Feb. 5 50.00 0.66 2.99 1.50 24 6 2 750 200 75
Feb. 6 50.00 0.67 2.99 1.55 20 5 2 2,000 800 60
Feb. 7 50.00 0.68 3.00 1.56 17 4 1 ... 600 34
Feb. 8 50.00 0.69 3.00 1.53 15 4 1 900 220 35
Feb. 9 50.00 0.71 3.00 1.54 14 4 1 Sunday.
Feb. 10 50.00 0.72 2.99 1.60 11 4 1 850 500 28
Feb. 11 50.00 0.74 2.99 1.62 10 4 1 1,000 500 23
Feb. 12 50.00 0.75 2.98 1.68 8 4 1 750 290 18
Feb. 13 50.00 0.76 2.99 1.74 9 4 1 700 260 10
Feb. 14 48.20 0.76 2.99 1.77 9 4 1 1,200 250 27
Feb. 15 51.80 0.79 2.99 1.89 61 18 1 5,500 4,800 13
Feb. 16 48.20 0.79 2.99 2.08 80 40 2 Sunday.
Feb. 17 48.20 0.81 2.99 2.24 80 40 3 33,000 1,300 60
Feb. 18 47.30 0.82 2.99 2.31 130 65 3 ... 950 120
Feb. 19 51.80 0.92 2.99 2.45 320 200 7 28,000 22,000 360
Feb. 20 52.70 0.99 2.99 2.61 177 97 9 22,000 16,300 350
Feb. 21 51.80 1.03 2.99 2.68 105 52 6 10,600 3,800 270
Feb. 22 50.90 1.07 2.99 2.72 85 42 5 Holiday.
Feb. 23 50.00 1.09 2.99 2.76 60 30 4 Sunday.
Feb. 24 51.80 1.12 2.99 2.80 46 19 3 3,600 1,700 120
Feb. 25 50.00 1.14 2.99 2.84 31 9 2 2,300 1,300 60
Feb. 26 50.00 1.17 3.00 2.87 30 8 2 3,800 1,300 43
Feb. 27 48.20 1.18 2.99 2.90 30 7 1 1,300 900 42
Feb. 28 47.30 1.19 2.99 2.94 37 7 1 1,400 800 31
Feb. 29 51.80 1.23 2.99 3.01 123 49 2 13,500 750 35
Mar. 1 48.20 1.20 2.98 2.99 97 44 5 Sunday.
Mar. 2 50.00 1.28 2.99 3.12 82 35 4 8,000 2,500 70
Mar. 3 50.90 1.32 2.98 3.22 87 38 4 11,000 6,000 55
Mar. 4 50.00 1.33 2.99 3.28 67 29 3 6,000 1,400 38
Mar. 5 50.00 1.35 2.99 3.32 59 23 3 4,400 2,500 37
Mar. 6 Discontinued; sand filter being used for sedimentation experiments.
Figure 9—Detail of Strainer System.
Table 19—Record of Experimental Filter Plant.
No. 3.
Date. Sand Filter. Turbidity. Bacteria. Coagulant.
Rate. Loss of head. Applied water. Effluent, coagulant. Effluent, sand. Applied water. Effluent, coagulant. Effluent, sand. Grains, per gallon.
1907.
Feb. 12 2.99 0.18 14 ... 2 ... ... ... ...
Feb. 13 3.00 0.17 15 ... 2 600 ... ... ...
Feb. 14 3.19 0.18 15 ... 2 650 ... ... ...
Feb. 15 3.86 0.22 12 ... 2 600 ... 2,500 ...
Feb. 16 3.84 0.29 14 ... 2 850 ... 1,600 ...
Feb. 17 ... ... ... ... ... ... ... ... ...
Feb. 18 ... ... ... ... ... 1,200 ... 300 ...
Feb. 21 3.91 0.32 20 ... 2 1,800 ... 550 ...
Feb. 22 3.95 0.39 15 ... 2 2 Holiday.
Feb. 23 3.94 0.43 20 ... 3 1,600 ... 1,100 ...
Feb. 24 3.89 0.47 20 ... 3 3 Sunday.
Feb. 25 4.19 0.52 20 ... 3 1,400 ... 600 ...
Feb. 26 4.13 0.57 20 ... 3 700 ... 650 ...
Feb. 27 3.32 0.62 17 ... 3 700 ... 2,300 ...
Feb. 28 4.41 0.67 15 ... 3 800 ... 550 ...
Mar. 1 3.91 0.72 15 ... 3 650 ... 300 ...
Mar. 2 3.93 0.79 15 ... 3 1,000 ... 270 ...
Mar. 3 3.90 0.82 31 ... 3 Sunday.
Mar. 4 3.92 0.80 35 ... 3 1,200 ... 140 1.45
Mar. 5 3.96 0.98 135 ... 4 13,000 ... 190 1.94
Mar. 6 4.05 1.25 135 29 2 18,000 2,100 160 2.03
Mar. 7 3.95 1.52 102 15 1 24,000 3,500 160 1.50
Mar. 8 3.90 1.67 100 15 1 22,000 1,800 130 1.38
Mar. 9 3.93 1.80 90 15 1 24,000 3,500 130 1.37
Mar. 10 3.95 1.91 82 16 1 Sunday. 1.26
Mar. 11 3.96 2.08 68 18 1 18,000 6,000 120 1.24
Mar. 12 4.02 2.19 46 18 1 11,000 9,000 140 1.08
Mar. 13 4.02 2.31 40 15 1 9,000 5,000 120 0.94
Mar. 14 3.96 2.44 39 16 1 5,500 3,600 90 0
Mar. 15 4.07 2.42 35 20 1 6,500 3,800 85 0
Mar. 16 3.85 2.20 60 29 1 5,000 3,500 100 1.26
Mar. 17 3.95 2.21 135 25 1 Sunday. 1.52
Mar. 18 3.88 2.86 170 25 1 9,000 1,900 85 1.75
Mar. 19 3.82 3.31 125 21 1 7,000 700 65 1.57
Mar. 20 3.78 3.47 102 20 1 4,800 1,500 60 1.31
Mar. 21 3.71 3.70 125 20 1 8,500 1,500 70 1.38
Mar. 22 3.64 3.81 190 25 1 7,500 1,100 35 1.57
Mar. 23 3.58 3.95 180 26 1 7,500 470 55 1.68
Mar. 24 3.46 4.18 140 19 1 Sunday. 1.52
Mar. 25 Scraped, 1.03 in. of sand removed.
Mar. 27 4.06 0.22 47 8 1 2,200 480 60 1.08
Mar. 28 4.02 0.37 35 ... 0 1,300 250 80 1.00
Mar. 29 4.02 0.46 26 ... ... 700 240 65 0
Mar. 30 Shut down to fill coagulant basin.
... ... 25 ... ... 310 ... ... 0
Mar. 31 4.00 0.45 21 15 1 Sunday. 0
Apr. 1 3.39 0.42 20 15 1 600 1,000 43 0
Apr. 2 3.06 0.46 24 17 1 270 Lost. 35 0
Apr. 3 3.01 0.49 24 17 1 460 " 41 0
Apr. 4 2.95 0.50 20 15 1 280 550 27 0
Apr. 5 2.95 0.51 20 13 1 450 1,000 60 0
Apr. 6 2.96 0.49 20 12 1 320 50 35 0
Apr. 7 2.99 0.48 20 12 1 Sunday. 0
Apr. 8 3.01 0.49 18 12 1 330 650 22 0
Apr. 9 3.01 0.55 18 12 1 140 750 21 0
Apr. 10 3.02 0.57 30 15 0 750 5,000 29 0
Apr. 11 3.04 0.61 66 16 0 4,000 550 25 1.11
Apr. 12 3.09 0.72 72 13 0 14,000 2,200 17 1.15
Apr. 13 3.07 0.88 80 19 0 13,000 3,900 25 1.14
Apr. 14 2.98 1.04 77 18 1 Sunday. 1.17
Apr. 15 2.97 1.20 62 18 1 7,060 2,200 19 1.09
Apr. 16 3.01 1.32 47 17 1 3,600 900 22 1.08
Apr. 17 3.05 1.44 39 19 0 1,600 1,100 12 0
Apr. 18 3.04 1.41 30 20 1 1,810 1,870 14 0
Apr. 19 3.04 1.35 25 18 1 790 910 14 0
Apr. 20 3.07 1.30 20 15 1 540 480 15 0
Apr. 21 3.07 1.26 20 15 1 Sunday. ...
Apr. 22 3.04 1.21 18 12 0 235 420 21 0
Apr. 23 3.06 1.22 15 10 0 170 420 8 0
Apr. 24 2.99 1.26 19 10 0 150 250 17 0
Apr. 25 3.04 1.27 34 12 0 700 260 19 0
Apr. 26 3.07 1.28 46 12 0 1,200 320 80 0
Apr. 27 2.94 1.49 52 ... 0 1,700 1,500 70 0
Apr. 28 2.96 1.88 45 ... 1 Sunday. 0
Apr. 29 2.99 2.40 44 33 1 600 1,400 19 0
Apr. 30 3.00 2.83 39 29 1 550 1,200 14 0
May 1 3.01 2.71 31 21 1 500 1,300 20 0
May 2 3.01 2.51 24 15 1 500 850 16 0
May 3 3.00 2.36 19 12 1 280 650 34 0
May 4 3.01 2.29 16 10 0 400 550 24 0
May 5 3.01 2.25 15 9 0 Sunday. 0
May 6 3.06 2.32 13 8 0 390 460 80 0
May 7 2.96 2.46 12 7 0 190 ... 18 0
May 8 3.00 2.51 10 5 0 ... ... ... 0
May 9 3.00 2.77 10 5 0 390 1,100 14 0
May 10 3.01 2.87 10 5 0 300 500 21 0
May 11 2.99 3.16 12 6 0 390 650 16 0
May 12 3.00 3.34 17 7 0 Sunday. 0
May 13 3.00 3.44 35 9 0 600 470 27 0
May 14 3.01 3.46 39 12 0 500 550 25 0
May 15 3.01 3.56 17 ... 0 500 900 23 0
May 16 2.93 4.07 24 ... 0 290 2,500 25 0
May 17 3.01 4.34 18 ... 0 260 2,000 16 0
May 18 2.93 4.25 15 8 0 190 600 19 0
May 19 2.97 4.36 12 8 0 Sunday. 0
May 20 3.01 4.64 12 8 0 260 450 15 0
May 21 2.99 4.55 16 8 0 260 330 14 0
May 22 3.01 4.57 20 8 0 280 390 22 0
May 23 3.00 4.51 15 8 0 130 240 19 0
May 24 2.98 4.44 15 8 0 170 240 30 0
May 25 3.00 4.38 15 8 0 340 400 41 0
May 26 3.00 4.38 18 8 0 Sunday. 0
May 27 Shut down to scrape sand filter; 1.09 in. of sand removed.
May 28 Cleaning coagulant basin and treating coagulant basin with 1:2,000,000 solution of copper sulphate.
May 29 16 ... ... solution of copper sulphate.
May 30 3.00 0.11 14 8 1 Holiday. 0
May 31 3.01 0.10 17 8 1 380 18,000 150 0
June 1 3.01 0.09 15 8 1 900 7,000 150 0
June 2 3.01 0.10 17 8 1 Sunday. 0
June 3 3.01 0.10 24 10 1 550 8,000 130 0
June 4 3.04 0.11 37 13 1 6,500 7,500 140 0
June 5 3.00 0.11 65 29 1 3,200 3,600 110 0
June 6 3.00 0.11 77 46 1 1,500 800 60 1.17
June 7 2.99 0.12 64 21 1 2,100 1,500 90 1.18
June 8 2.98 0.17 46 22 1 660 1,000 60 0
June 9 3.00 0.18 44 30 1 Sunday. 0
June 10 3.01 0.18 36 26 1 240 400 32 0
June 11 3.00 0.17 30 20 1 280 300 31 0
June 12 3.00 0.17 34 22 1 330 ... 28 0
June 13 2.99 0.17 35 25 1 480 480 39 0
June 14 2.98 0.17 31 22 1 440 550 32 0
June 15 2.99 0.19 32 22 1 420 450 27 0
June 16 3.02 0.21 26 18 1 Sunday. 0
June 17 2.99 0.23 26 16 1 340 750 14 0
June 18 3.02 0.25 31 20 1 440 750 21 0
June 19 3.02 0.29 37 27 1 500 460 35 0
June 20 3.00 0.32 30 21 1 330 440 88 0
June 21 3.01 0.36 25 16 1 170 370 23 0
June 22 3.00 0.40 20 12 1 100 300 17 0
June 23 2.97 0.43 26 11 1 Sunday. 0
June 24 2.97 0.44 140 36 1 1,700 350 22 1.59
June 25 3.02 0.45 130 27 1 400 250 16 1.55
June 26 Interrupted, defective meter. 750 330 ... 0
June 27 3.00 0.43 65 15 0 ... 1,400 ... 0
June 28 3.00 0.44 47 19 0 ... 1,400 120 0
June 29 2.99 0.44 37 20 0 220 300 ... 0
June 30 2.97 0.42 30 19 0 Sunday. 0
July 1 2.99 0.37 30 18 0 400 600 85 0
July 2 3.01 0.33 32 19 0 180 1,000 50 0
July 3 3.00 0.31 36 21 0 350 310 21 0
July 4 3.00 0.30 44 30 0 Holiday.
July 5 3.00 0.29 44 35 0 550 400 41 0
July 6 3.00 0.28 39 30 0 250 280 22 0
July 7 3.00 0.28 34 24 0 Sunday. 0
July 8 3.00 0.28 25 16 0 220 260 27 0
July 9 3.00 0.27 22 13 0 50 40 19 0
July 10 2.98 0.27 47 27 1 Lost. Lost. Lost. 0
July 11 3.00 0.27 90 41 1 150 50 8 1.27
July 12 3.00 0.29 97 21 1 300 200 13 1.27
July 13 3.00 0.34 90 20 0 220 160 17 1.27
July 14 3.00 0.40 90 19 0 Sunday. 1.27
July 15 3.00 0.54 95 18 0 375 150 1.27
July 16 3.00 0.59 120 20 0 Lost. 50 Lost. 1.36
July 17 3.00 0.58 85 16 0 270 60 3 1.26
July 18 2.99 0.61 56 13 0 1,675 70 1.17
July 19 3.01 0.61 41 18 0 450 700 11 0
July 20 2.99 0.51 62 27 0 300 720 8 0
July 21 3.00 0.47 62 32 0 Sunday. 0
July 22 3.00 0.47 80 34 0 1,400 560 14 1.17
July 23 3.01 0.49 105 21 0 3,700 490 40 1.25
July 24 3.01 0.60 95 19 0 770 110 80 1.27
July 25 3.00 0.68 77 16 0 250 80 5 1.22
July 26 2.99 0.68 67 17 0 140 40 4 0
July 27 3.00 0.69 54 20 0 300 130 21 0
July 28 3.00 0.72 46 27 0 Sunday. 0
July 29 3.00 0.74 36 26 0 470 290 100 0
July 30 2.99 0.76 29 19 0 Lost. Lost. Lost. 0
July 31 2.99 0.77 21 12 0 Lost. Lost. Lost. 0
Aug. 1 3.00 0.75 16 9 0 Lost. Lost. Lost. 0
Aug. 2 3.00 0.74 15 8 0 130 140 4 0
Aug. 3 3.00 0.74 16 7 0 120 180 6 0
Aug. 4 3.00 0.75 21 6 0 Sunday.
Aug. 5 3.00 0.76 29 8 0 230 100 44 0
Aug. 6 3.00 0.79 34 12 0 85 470 ... 0
Aug. 7 2.99 1.01 21 12 0 200 450 ... 0
Aug. 8 3.00 1.31 19 11 0 100 180 45 0
Aug. 9 2.98 1.44 16 9 0 75 80 16 0
Aug. 10 3.00 1.44 24 9 0 60 90 11 0
Aug. 11 3.00 1.49 62 22 0 Sunday.
Aug. 12 3.00 1.62 120 39 0 620 260 16 1.45
Aug. 13 2.97 2.06 107 22 0 820 520 10 1.38
Aug. 14 2.97 3.06 82 19 0 850 120 26 1.22
Aug. 15 2.81 3.91 65 15 0 150 260 6 1.17
Aug. 16 3.00 4.29 45 18 0 270 340 17 0
Aug. 17 3.00 3.86 35 22 0 340 200 13 0
Aug. 18 3.00 3.47 21 13 0 Sunday.
Aug. 19 3.00 3.49 18 10 0 180 220 17 0
Aug. 20 3.00 3.56 20 8 0 210 180 16 0
Aug. 21 3.00 3.58 20 10 0 1,300 650 8 0
Aug. 22 2.99 3.73 27 13 0 3,800 360 6 0
Aug. 23 3.00 4.00 49 34 0 2,500 700 10 0
Aug. 24 3.00 4.05 36 26 0 3,900 630 12 0
Aug. 25 2.98 4.06 34 24 0 Sunday.
Aug. 26 3.00 4.20 21 13 0 700 310 16 0
Aug. 27 3.00 4.31 19 11 0 470 250 12 0
Aug. 28 2.99 4.40 18 10 0 500 160 18 0
Aug. 29 3.01 4.41 17 9 0 360 110 9 0
Aug. 30 2.98 4.46 15 8 0 320 310 14 0
Aug. 31 Scraped. 1.88 in. of sand removed. 13 ... ... 200 100 ... 0
Sept. 5 3.00 0.10 34 4 0 360 950 ... 1.04
Sept. 6 3.00 0.10 160 3 0 15,000 1,500 190 1.35
Sept. 7 3.00 0.09 64 3 0 2,000 260 100 1.20
Sept. 8 3.00 0.08 56 4 0 Sunday. ... 1.04
Sept. 9 3.00 0.08 59 3 0 220 180 38 1.04
Sept. 10 2.97 0.07 57 3 0 18,000 150 29 1.06
Sept. 11 2.98 0.07 65 2 0 2,700 200 37 1.04
Sept. 12 2.98 0.08 72 2 0 1,000 125 19 1.04
Sept. 13 3.00 0.08 87 3 0 2,300 200 72 1.20
Sept. 14 3.00 0.08 72 3 0 2,400 360 36 1.12
Sept. 15 3.00 0.08 65 3 0 Sunday. 1.04
Sept. 16 3.00 0.08 65 2 0 Lost. Lost. 38 1.04
Sept. 17 3.00 0.08 52 2 0 420 200 38 1.07
Sept. 18 3.00 0.08 60 2 0 900 200 17 1.07
Sept. 19 2.98 0.08 85 2 0 2,000 220 25 1.12
Sept. 20 2.98 0.09 100 2 0 4,200 320 31 1.24
Sept. 21 2.99 0.09 120 3 0 1,100 160 19 1.33
Sept. 22 3.00 0.09 137 3 0 Sunday. 1.45
Sept. 23 3.02 0.09 112 4 0 2,100 190 15 1.41
Sept. 24 3.00 0.10 100 4 0 4,000 620 13 1.33
Sept. 25 3.00 0.11 432 3 0 56,000 290 7 1.83
Sept. 26 2.99 0.11 385 2 0 1,300 950 19 2.34
Sept. 27 3.00 0.12 245 4 0 4,000 Lost. 20 1.91
Sept. 28 2.98 0.13 127 4 0 15,000 1,000 8 1.54
Sept. 29 2.98 0.14 105 4 0 Sunday. 1.34
Sept. 30 2.99 0.15 115 3 0 Lost. Lost. 46 1.35
Oct. 1 3.00 0.15 82 3 0 600 1,700 22 1.24
Oct. 2 2.98 0.16 65 3 0 4,400 550 8 1.09
Oct. 3 3.00 0.17 59 2 0 900 330 15 1.04
Oct. 4 2.99 0.17 55 2 0 850 250 11 1.03
Oct. 5 2.99 0.19 59 2 0 2,000 450 25 1.04
Oct. 6 2.98 0.20 59 2 0 Sunday. 1.04
Oct. 7 2.98 0.21 52 2 0 1,250 2,300 42 1.04
Oct. 8 2.97 0.21 54 2 0 11,000 100 15 1.04
Oct. 9 2.98 0.22 51 2 0 2,000 1,600 7 1.04
Oct. 10 2.98 0.24 50 2 0 800 Lost. 24 1.04
Oct. 11 2.98 0.25 47 2 0 2,000 1,200 21 0
Oct. 12 2.97 0.26 36 3 0 1,200 1,200 19 0
Oct. 13 2.98 0.27 40 4 0 Sunday. 0
Oct. 14 2.98 0.29 47 5 0 1,200 830 25 0
Oct. 15 2.99 0.31 41 5 0 900 Lost. 105 0
Oct. 16 2.99 0.32 35 4 0 Lost. 550 19 0
Oct. 17 2.98 0.34 30 4 0 550 800 21 0
Oct. 18 3.00 0.35 25 4 0 260 350 9 0
Oct. 19 3.00 0.35 25 4 0 750 310 35 0
Oct. 20 3.00 0.35 20 3 0 Sunday. 0
Oct. 21 3.00 0.35 19 3 0 480 540 35 0
Oct. 22 2.99 0.36 18 3 0 230 440 17 0
Oct. 23 2.99 0.37 15 3 0 250 440 39 0
Oct. 24 2.98 0.38 15 3 0 300 500 60 0
Oct. 25 2.99 0.39 15 3 0 450 410 65 0
Oct. 26 2.99 0.40 15 3 0 450 500 44 0
Oct. 27 2.99 0.41 13 2 0 Sunday. 0
Oct. 28 2.99 0.43 13 2 0 190 500 50 0
Oct. 29 2.98 0.44 25 2 0 380 60 75 0
Oct. 30 2.99 0.46 21 2 0 450 180 3 0
Oct. 31 2.96 0.48 25 3 0 2,300 390 75 0
Nov. 4 3.00 0.51 125 2 0 ... ... ... 0
Nov. 5 3.00 0.53 185 2 0 6,000 1,600 90 1.70
Nov. 6 2.99 0.56 170 2 0 5,000 3,900 6 1.70
Nov. 7 2.99 0.60 100 3 0 14,000 300 9 1.48
Nov. 8 2.99 0.64 95 3 0 1,900 230 2 1.27
Nov. 9 2.99 0.70 80 4 0 4,000 2,700 200 0
Nov. 10 2.99 0.79 67 4 0 Sunday. 0
Nov. 11 2.99 1.00 52 6 0 1,900 2,000 200 0
Nov. 12 2.99 1.46 40 9 0 7,500 2,300 160 0
Nov. 13 2.98 2.09 36 10 0 1,600 1,100 170 0
Nov. 14 2.99 2.74 42 9 0 2,700 950 130 0
Nov. 15 2.99 2.98 35 8 0 1,800 800 11 0
Nov. 16 2.99 3.03 26 8 0 1,100 800 90 0
Nov. 17 3.00 3.07 20 6 0 Sunday. 0
Nov. 18 3.00 3.09 17 5 0 1,600 700 100 0
Nov. 20 2.99 3.17 45 3 0 6,500 120 120 0
Nov. 21 2.99 3.22 52 3 0 9,900 1,000 80 0
Nov. 22 2.99 3.27 65 5 0 10,000 3,200 90 0
Nov. 23 2.99 3.33 49 8 0 18,000 2,400 100 0
Nov. 24 2.99 3.41 134 11 0 Sunday. 0
Nov. 25 2.98 3.54 225 12 1 50,000 2,100 65 1.68
Nov. 26 2.98 3.68 237 13 1 40,000 2,400 95 1.76
Nov. 27 2.99 3.96 185 16 1 16,000 2,600 60 1.74
Nov. 28 2.98 4.29 130 18 1 Holiday. 1.57
Nov. 29 2.97 4.48 80 19 1 10,000 2,500 65 1.50
Nov. 30 2.97 4.54 54 15 1 3,800 1,900 85 0
Dec. 6 Scraped, 1.62 in. of sand removed.
Dec. 8 2.97 0.16 12 3 0 Sunday. 1.17
Dec. 9 2.98 0.16 11 3 0 1,200 410 10 1.17
Dec. 10 2.98 0.15 12 3 0 800 550 150 1.17
Dec. 11 2.99 0.15 255 3 0 6,500 600 130 1.52
Dec. 12 3.00 0.13 212 2 0 48,000 500 130 1.99
Dec. 13 2.98 0.13 495 4 0 42,000 500 120 2.06
Dec. 14 2.99 0.14 357 5 0 49,000 750 150 2.12
Dec. 15 2.99 0.15 157 6 0 Sunday. 1.69
Dec. 16 2.98 0.16 90 9 0 19,000 900 20 1.28
Dec. 17 2.98 0.20 70 12 0 21,000 400 170 1.17
Dec. 18 2.98 0.24 49 12 1 6,500 7,000 350 1.17
Dec. 19 2.98 0.29 39 9 1 Lost. Lost. Lost. 1.17
Dec. 20 2.98 0.36 42 7 1 Lost. Lost. Lost. 1.17
Dec. 21 2.97 0.45 26 5 0 Lost. Lost. Lost. 1.17
Dec. 22 2.98 0.57 20 4 0 Sunday. 1.17
Dec. 23 2.98 0.71 34 3 0 1,400 1,300 220 1.17
Dec. 24 2.98 0.83 195 2 0 9,000 1,000 140 1.49
Dec. 25 2.98 0.97 445 2 0 Holiday. 2.43
Dec. 26 2.98 1.11 370 2 0 51,000 1,000 39 2.15
Dec. 27 2.98 1.27 245 3 0 55,000 1,600 70 1.91
Dec. 28 2.98 1.40 102 4 0 10,000 1,000 80 1.50
Dec. 29 2.98 1.60 75 3 0 Sunday. 1.21
Dec. 30 2.97 1.85 56 3 0 4,400 700 80 1.17
Dec. 31 2.98 2.07 39 2 0 14,000 1,200 65 1.17
1908.
Jan. 1 2.99 2.11 31 2 0 Holiday. 1.17
Jan. 2 2.98 2.17 39 2 0 4,400 700 19 1.17
Jan. 3 2.98 2.26 36 2 0 3,100 1,000 13 1.17
Jan. 4 2.98 2.34 32 2 0 2,400 550 19 1.17
Jan. 5 2.98 2.41 26 2 0 Sunday. 1.17
Jan. 6 2.98 2.49 20 2 0 600 230 18 1.17
Jan. 7 2.98 2.58 20 2 0 1,100 370 12 1.17
Jan. 8 2.99 2.61 22 2 0 1,900 1,100 20 1.17
Jan. 9 2.99 2.63 45 2 0 13,000 1,200 22 1.21
Jan. 10 2.98 2.67 70 2 0 10,000 700 16 1.17
Jan. 11 2.98 2.72 56 2 0 16,000 1,200 11 1.17
Jan. 12 2.98 2.78 40 2 0 Sunday. 1.17
Jan. 13 2.98 2.84 110 2 0 8,500 90 6 1.27
Jan. 14 2.98 2.95 210 2 0 16,000 150 23 1.56
Jan. 15 2.98 3.07 325 3 0 24,000 1,100 19 1.92
Jan. 16 2.98 3.23 360 5 6 28,000 1,000 14 2.10
Jan. 17 2.97 3.73 242 6 0 65,000 490 23 1.91
Jan. 18 2.98 4.42 137 6 0 7,000 1,600 14 1.66
Jan. 19 2.99 4.75 117 5 0 Sunday. 1.50
Jan. 21 Scrape, 1.45 in. of sand removed.
Jan. 23 3.00 0.14 40 3 0 ... ... ... 1.17
Jan. 24 3.00 0.14 40 3 0 2,300 550 55 1.17
Jan. 25 3.00 0.13 39 3 0 1,100 850 95 0
Jan. 26 3.00 0.13 32 3 0 Sunday. 0
Jan. 27 3.00 0.13 32 2 0 300 280 60 0
Jan. 28 2.99 0.15 45 3 0 1,200 700 70 0
Jan. 29 2.99 0.20 69 6 1 1,000 900 75 0
Jan. 30 2.99 0.24 57 8 1 1,400 650 50 0
Jan. 31 2.99 0.30 42 6 1 1,100 600 36 0
Feb. 1 2.99 0.34 39 5 1 750 50 25 0
Feb. 2 2.99 0.41 27 4 1 Sunday. 0
Feb. 3 2.99 0.51 29 3 0 1,300 220 16 0
Feb. 4 2.99 0.56 25 3 0 600 370 10 0
Feb. 5 2.99 0.58 24 4 0 750 700 21 0
Feb. 6 2.99 0.61 20 6 0 2,000 650 4 0
Feb. 7 3.00 0.64 17 8 1 ... 410 26 0
Feb. 8 2.99 0.66 15 8 1 900 160 42 0
Feb. 9 3.00 0.67 14 8 1 Sunday. 0
Feb. 10 2.99 0.67 11 8 1 850 450 18 0
Feb. 11 3.00 0.66 10 7 1 1,000 600 26 0
Feb. 12 3.01 0.64 8 6 1 750 350 16 0
Feb. 13 3.00 0.62 9 5 1 700 120 10 0
Feb. 14 3.00 0.61 9 5 1 1,200 950 43 0
Feb. 15 3.00 0.60 61 5 1 5,500 1,000 23 0
Feb. 16 3.00 0.60 80 6 1 Sunday. 0
Feb. 17 3.00 0.62 80 14 1 33,000 6,100 36 0
Feb. 18 2.99 0.67 130 20 1 ... 2,000 11 0
Feb. 19 2.99 0.76 320 18 2 28,000 9,000 120 0
Feb. 20 2.99 0.83 177 15 2 22,000 8,500 190 0
Feb. 29 3.00 0.85 123 8 1 ... ... ... 0
Mar. 1 3.00 0.87 97 9 1 Sunday. 0
Mar. 2 2.99 0.92 82 13 1 8,000 4,400 50 0
Mar. 3 2.98 0.96 87 19 1 11,000 2,100 26 0
Mar. 4 2.99 1.02 67 21 1 6,000 4,700 7 0
Mar. 5 2.99 1.08 59 25 1 4,400 10,000 36 0
Mar. 6 2.99 1.15 72 25 2 7,000 7,400 50 0
Mar. 7 2.98 1.21 82 25 2 9,500 6,500 28 0
Mar. 8 2.99 1.25 92 29 2 Sunday. 0
Mar. 9 2.99 1.30 125 34 2 11,000 4,800 25 0
Mar. 10 2.99 1.35 142 39 2 8,500 1,200 23 0
Mar. 11 2.99 1.39 155 35 2 6,500 2,400 20 0
Mar. 12 2.99 1.42 135 29 2 5,900 1,500 11 0
Mar. 13 2.99 1.46 122 19 2 1,900 1,100 12 0
Mar. 14 2.99 1.47 97 12 1 1,800 700 6 0
Mar. 15 2.99 1.48 77 8 1 Sunday. 0
Mar. 16 3.00 1.52 65 9 0 1,400 700 8 0
Mar. 17 2.99 1.66 59 7 0 900 800 11 0
Mar. 18 2.99 1.72 67 11 1 1,000 650 8 0
Mar. 19 2.99 1.75 60 24 1 ... 600 18 0
Mar. 20 2.99 1.81 57 25 1 1,300 750 20 0
Mar. 21 2.99 1.89 67 22 1 800 480 18 0
Mar. 22 2.99 1.95 80 21 1 Sunday. 0
Mar. 23 3.00 2.00 90 26 1 4,600 440 19 0
Mar. 24 2.98 2.06 82 32 1 2,500 1,200 10 0
Mar. 25 2.99 2.17 67 39 1 1,600 650 20 0
Mar. 26 2.99 2.24 60 36 1 550 410 7 0
Mar. 27 2.99 2.29 59 30 1 900 900 29 0
Mar. 28 3.00 2.32 51 21 1 650 250 42 0
Mar. 29 2.99 2.35 31 18 1 Sunday. 0
Mar. 30 3.00 2.38 30 14 1 500 650 28 0
Mar. 31 2.99 2.43 39 9 1 750 290 30 0
Apr. 1 2.99 2.50 44 7 1 750 390 32 0
Apr. 2 2.99 2.58 42 8 1 1,100 280 47 0
Apr. 3 2.99 2.65 41 11 1 1,500 550 70 0
Apr. 4 2.99 2.74 54 12 1 700 380 4 0
Apr. 5 3.00 2.82 50 12 1 Sunday. 0
Apr. 6 2.99 2.88 41 14 1 440 150 4 0
Apr. 7 2.99 2.98 35 13 1 650 270 42 0
Apr. 8 2.98 3.15 39 11 1 550 210 65 0
Apr. 9 2.99 3.35 40 8 1 390 160 95 0
Apr. 10 2.98 3.50 40 8 1 500 130 130 0
Apr. 11 2.99 3.65 45 7 0 430 145 100 0
Apr. 12 2.99 3.79 52 5 0 Sunday. 0
Apr. 13 2.99 3.92 50 4 0 490 160 80 0
Apr. 14 2.99 4.05 45 4 0 550 170 90 0
Apr. 15 2.99 4.16 45 3 0 420 160 12 0
Apr. 16 ... 4.24 45 3 0 360 130 90 0
Apr. 21 Scraped, 0.12 in. of sand removed.
Apr. 23 ... 0.13 25 2 0 140 140 ... 0
Apr. 24 3.00 0.12 21 2 0 200 Lost. 150 0
Apr. 25 3.00 0.10 20 2 0 85 550 45 0
Apr. 26 3.00 0.10 21 3 0 Sunday. 0
Apr. 27 3.00 0.10 18 3 0 95 850 50 0
Apr. 28 3.00 0.10 20 3 0 70 220 48 0
Apr. 29 3.00 0.09 24 3 0 110 210 95 0
Apr. 30 3.00 0.09 21 3 0 70 140 29 0
May 1 3.00 0.09 32 3 0 130 210 65 0
May 2 3.00 0.09 26 3 0 140 140 55 0
May 3 3.00 0.11 22 5 0 Sunday. 0
May 4 3.00 0.11 19 4 0 85 210 75 0
May 5 3.00 0.11 18 4 0 130 150 48 0
May 6 2.99 0.12 18 3 0 230 430 50 0
May 7 3.00 0.13 19 3 0 160 90 40 0
May 8 3.00 0.14 19 3 0 375 425 7 0
May 9 2.99 0.14 18 3 0 1,209 180 6 0
May 10 3.00 0.14 30 3 0 Sunday. 0
May 11 3.00 0.13 60 3 0 2,800 150 12 0
May 12 3.00 0.13 70 3 0 2,900 225 26 0
May 13 3.00 0.13 66 7 0 1,800 450 53 0
May 14 3.00 0.14 45 9 0 2,700 550 10 0
May 15 2.99 0.14 39 7 0 950 300 65 0
May 16 2.99 0.22 49 6 0 800 250 49 0
May 17 2.99 0.33 46 4 0 Sunday. 0
May 18 2.99 0.44 31 3 0 700 1,700 80 0
May 19 2.98 0.62 36 3 0 375 950 53 0
May 20 2.99 0.75 41 3 0 425 700 46 0
May 21 2.99 0.89 31 4 0 300 600 6 0
May 22 2.99 1.01 50 5 0 950 230 17 0
May 23 2.99 1.12 127 5 0 2,400 32 28 0
May 24 2.99 1.20 110 6 0 Sunday. 0
May 25 2.99 1.24 90 9 0 1,100 850 9 0
May 26 2.98 1.31 135 11 0 3,200 150 17 0
May 27 2.97 1.54 110 12 0 1,450 175 8 0
May 28 2.97 1.81 90 10 0 1,000 132 7 0
May 29 2.97 2.08 70 7 0 1,100 230 8 0
May 30 2.97 2.36 50 5 0 Holiday. 0
May 31 2.98 2.63 34 4 0 Sunday. 0
June 1 2.98 2.77 35 2 0 ... ... ... 0
June 2 2.98 2.84 39 2 0 ... ... ... 0
June 3 2.98 3.02 35 3 0 ... ... ... 0
June 4 3.00 3.01 30 4 0 ... ... ... 0
June 5 3.00 2.97 30 5 0 ... ... ... 0
June 6 3.01 2.81 27 5 0 ... ... ... 0
June 7 3.01 2.62 22 5 0 ... ... ... 0
June 8 3.01 2.38 20 4 0 ... ... ... 0
June 9 3.00 2.19 20 3 0 ... ... ... 0
June 10 3.01 2.02 17 3 0 ... ... ... 0
June 11 2.99 1.89 12 3 0 ... ... ... 0
June 12 2.98 1.92 11 2 0 ... ... ... 0
June 13 2.98 1.99 36 2 0 ... ... ... 0
June 14 2.98 2.08 39 2 0 ... ... ... 0
June 15 2.98 2.25 25 4 0 ... ... ... 0
June 16 2.98 2.54 34 5 0 ... ... ... 0
June 17 2.97 2.85 64 5 0 ... ... ... 0
June 18 2.97 3.20 57 5 0 ... ... ... 0
June 19 2.98 3.47 46 7 0 ... ... ... 0
June 20 2.99 3.73 37 8 0 ... ... ... 0
June 21 2.99 4.10 29 8 0 ... ... ... 0
June 22 2.99 4.44 25 6 0 ... ... ... 0
June 23 2.99 4.61 25 5 0 ... ... ... 0
June 26 3.01 0.09 15 2 0 ... ... ... 0
June 27 3.00 0.09 12 2 0 ... ... ... 0
June 28 3.00 0.09 9 2 0 ... ... ... 0
June 29 3.00 0.08 8 2 0 ... ... ... 0
June 30 3.00 0.07 10 2 0 ... ... ... 0
July 1 3.00 0.07 6 2 0 80 75 3 0
July 2 3.00 0.07 8 2 0 290 20 3 0
July 3 3.00 0.07 8 2 0 350 140 4 0
July 4 3.00 0.07 9 2 0 Holiday. 0
July 5 3.00 0.07 10 2 0 Sunday. 0
July 6 3.00 0.07 9 2 0 300 52 4 0
July 7 3.00 0.07 8 2 0 110 35 2 0
July 8 3.00 0.07 9 2 0 85 105 2 0
July 9 3.00 0.07 8 2 0 85 80 3 0
July 10 ... ... ... ... ... 300 65 1 0
July 11 3.00 0.08 12 2 0 145 95 11 0
July 12 3.00 0.08 11 2 0 Sunday. 0
July 13 3.00 0.08 10 2 0 115 105 7 0
July 14 3.00 0.09 16 2 0 800 34 1 0
July 15 3.00 0.09 17 2 0 180 165 3 0
July 16 3.00 0.10 14 2 6 100 95 2 0
July 17 3.00 0.10 10 2 0 65 65 1 0
July 18 3.00 0.11 11 2 0 38 200 24 0
July 19 3.00 0.11 12 2 0 Sunday. 0
July 20 3.00 0.12 10 2 0 95 31 1 0
July 21 3.00 0.12 10 2 0 70 100 2 0
July 22 3.00 0.13 13 2 0 450 13 4 0
July 23 2.99 0.13 54 2 0 650 325 4 0
July 24 2.99 0.14 305 2 0 1,650 325 ... 0
July 25 3.00 0.15 330 4 0 2,600 55 2 0
July 26 3.00 0.15 290 9 0 Sunday. 0
July 27 3.00 0.16 335 11 0 35,000 1,200 6 0
July 28 2.99 0.17 170 10 0 1,200 675 6 0
July 29 3.00 0.17 180 8 0 2,000 270 11 0
July 30 2.99 0.18 237 7 0 800 190 2 0
July 31 3.00 0.19 250 6 0 1,000 310 6 0
Table 20—Summary of Results of Experimental Filters.
Filter number Number of runs 1 3 2 6 3 11 4 12 5 25 6 28
Rate, million gallons per acre per day:
Maximum............... 1.35 3.95 7.96 12.60 37.5 118.9
Minimum................ 0.62 2.30 3.73 5.77 6.68 7.1
Average................. 1.06 3.26 6.69 10.17 26.1 38.54
Length of run, in days:
Maximum............... 233.5 150.5 75.2 90.9 48.71 39.83
Minimum................ 181.7 42.0 14.5 10.1 0.67 0.62
Average................. 206.4 109.6 48.89 40.5 14.41 12.61
Million gallons filtered per acre per run:
Maximum............... 242.61 484.46 534.67 960.72 1,463.35 1,022.27
Minimum................ 202.60 135.66 93.79 92.57 19.53 53.32
Average................. 218.58 302.82 326.76 417.23 374.14 361.92
Cubic yards of sand removed per acre at end of each run:
Maximum............... 269 269 672 1,612 2,420 3,360
Minimum................ 269 134 101 134 134 101
Average................. 269 213 272 392 583 635
Cubic yards of sand removed per acre per million gallons filtered.......... 1.23 0.70 0.83 0.94 1.55 1.72
Average initial loss of head.......... 0.07 0.19 0.51 0.78 3.88 5.38
Turbidity, influent:
Maximum............... 120 120 120 120 90 100
Minimum................ 2 2 2 2 2 2
Average................. 20 20 21 22 18 19
Turbidity, effluent:
Maximum............... 11 13 17 18 30 30
Minimum................ 0 0 0 0 0 0
Average................. 1 1 2 2 4 3
Percentage reduction.......... 95.0 95.0 90.5 90.9 77.8 84.3
Bacteria, influent:
Maximum............... 180,000 180,000 180,000 110,000 180,000 37,500
Minimum................ 22 20 22 20 25 24
Average................. 4,800 5,100 4,500 4,200 6,900 5,900
Bacteria, effluent:
Maximum............... 4,000 1,300 3,200 5,400 12,800 2,400
Minimum................ 2 3 1 1 2 2
Average................. 160 85 110 120 190 180
Percentage,Reduction.......... 96.7 98.3 97.6 97.3 97.3 97.0
Number of samples examined for bacillus coli in influent:
10 c.c. ................... 549 478 476 436 325 336
1 c.c. ................... 560 492 486 445 335 342
0.1 c.c. ................ 525 459 452 413 318 317
0.01 c.c. .............. 511 443 439 405 308 304
0.001 c.c. ............ 500 434 429 394 299 294
Number of samples examined for bacillus coli in effluent:
10 c.c. ................... 512 452 454 404 296 309
1 c.c. ................... 513 454 457 406 299 311
0.1 c.c. ................ 480 419 426 383 271 286
0.01 c.c. .............. 478 406 410 367 261 276
0.001 c.c. ............ 478 406 410 367 261 276
Number samples positive, influent:
10 c.c. ................... 226 211 201 258 136 152
1 c.c. ................... 127 123 116 108 81 93
0.1 c.c. ................ 55 59 54 51 43 42
0.01 c.c. .............. 26 34 33 33 27 25
0.001 c.c. ............ 6 6 5 6 3 3
Number samples positive, effluent:
10 c.c. ................... 100 109 134 98 94 106
1 c.c. ................... 51 61 55 56 46 50
0.1 c.c. ................ 9 13 16 16 4 13
0.01 c.c. .............. 0 0 0 0 0 0
0.001 c.c. ............ 0 0 0 0 0 0
Percentage of samples showing bacillus coli in influent:
10 c.c. ................... 41.2 44.2 42.2 59.2 41.9 45.2
1 c.c. ................... 22.7 25.0 23.9 24.3 24.2 27.2
0.1 c.c. ................ 10.5 12.8 11.9 12.3 13.5 13.2
0.01 c.c. .............. 5.1 7.7 7.5 8.2 8.8 8.2
0.001 c.c. ............ 1.2 1.4 1.2 1.5 1.0 1.0
Percentage of samples showing bacillus coli in effluent:
10 c.c. ................... 19.5 24.1 29.5 24.2 31.7 34.3
1 c.c. ................... 10.0 13.4 12.0 13.8 15.4 16.1
0.1 c.c. ................ 1.9 3.1 3.8 4.2 1.5 4.5
0.01 c.c. .............. 0 0 0 0 0 0
0.001 c.c. ............ 0 0 0 0 0 0
Cost per million gallons for sand handling.......... $0.43 $0.25 $0.29 $0.33 $0.54 $0.60
Interest charges at 3%.......... 6.85 2.25 1.12 0.73 0.32 0.22
Total.......... 7.28 2.50 1.41 1.06 0.86 .82
Coli tests presumptive.