Page 195 - Water and wastewater engineering

4-50 WATER AND WASTEWATER ENGINEERING

An analysis of the water indicates that it is not corrosive.
Grain size analysis of sand and gravel
U.S. sieve no. Wt. retained, g
6 16.7
8 44.5
10 23.0
16 56.6
20 63.1
30 48.5
40 34.0
50 53.4
60 23.3
80 43.5
100 57.3
PAN 50.2
Total 494.1
EXTRACT FROM WELL LOG

Location: Mt Blanc (approx. 3 km east of Bastogne Retirement Center)
Boring Results (surface elevation at 158.5 m)
Depth, m Soil description
0–0.5 Sandy loam
0.5 –0.9 Sandy clay loam
0.9–1.5 Silty clay
1.5–10.7 Clay
10.7–11.1 Sandy loam
11.1–11.7 Sandy clay loam
11.7–12.1 Unconsolidated sandy clay (water at 17.0 m)
12.1–103.6 Clay
103.6–152.5 Shale
Well terminated in shale at 152.5 m

Pumping test results
Static water level before pumping began: 2.4 m below grade
3
Test well pumped at 0.006 m /s.
Drawdown in observation well 38.1 m from pumping well.
Time from start Drawdown from static
of pumping, min water level, m

1.0 0.42
2.0 0.53
4.0 0.69
8.0 0.79
10.0 0.85
20.0 0.96