Page 101 - Water and wastewater engineering

2-44 WATER AND WASTEWATER ENGINEERING

Typical well boring log

Aquifer material Depth, m
Clay and sand 12 static water level 12 m
Fine gray sand 10
Hardpan 2
Shale 2
Fractured rock 55
Shale 2 well terminated

2-12. Your firm has been employed to perform a preliminary data analysis for renovation
and expansion of a surface water treatment plant. The plant operator has provided the
following summary of daily turbidity readings. Using a spreadsheet you have writ-
ten, perform a cumulative probability analysis on the data shown below and prepare a
plot on probability paper. Using the plot, write a short summary report for your
supervisor that discusses the following:

• A general description of the behavior of the data.
• Your impression of the degree of difficulty in operating the plant and the need
for operational flexibility.
• A recommendation regarding further data analysis.

Monthly Average Turbidity 2005–2007 for Lake Michigan
Turbidity, Turbidity, Turbidity,
Month NTU Month NTU Month NTU
1 6.89 13 4.26 25 5.76
2 4.63 14 2.95 26 4.37
3 3.42 15 2.07 27 3.59
4 1.40 16 1.56 28 2.31
5 1.25 17 1.11 29 0.66
6 0.91 18 0.59 30 0.73
7 1.18 19 1.01 31 0.84
8 0.79 20 0.59 32 0.67
9 1.07 21 1.09 33 0.87
10 1.06 22 2.70 34 2.09
11 5.41 23 1.07 35 1.68
12 6.15 24 4.51 36 6.20

2-13. Your firm has been employed to perform a preliminary data analysis for renovation
and expansion of a surface water treatment plant. The plant operator has provided the
following summary of daily turbidity readings. Using a spreadsheet you have writ-
ten, perform a cumulative probability analysis on the data shown below and prepare