| The
source of the Drew Woods water supply is six wells located in the Drew Woods
system off Olsen Road near Drew Woods Drive in East Derry, NH. Treatment consist of chlorination for
disinfection, aeration to reduce radon levels, and phosphate addition to
sequester iron and manganese. |
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| DREW WOODS |
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| EPA # 0612150 |
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| Inorganic
Contaminants |
Units |
MCLG |
MCL |
Level
Detected |
Range |
Year |
Violation
Yes/No |
Typical
Source of Contaminant |
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| Arsenic |
ppb |
n/a |
10 |
4 |
n/a |
2006 |
NO |
Erosion of natural deposits; runoff from orchards; runoff from
glass and electronics production wastes. |
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| Barium |
ppm |
2 |
2 |
0.016 |
n/a |
2005 |
NO |
Discharge of drilling wastes; discharge from metal refineries;
erosion of natural deposits. |
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| Radiological
Contaminants |
Units |
MCLG |
MCL |
Average
Level Detected |
Range |
Year |
Violation
Yes/No |
Typical
Source of Contaminant |
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| Gross
Alpha (Compliance) |
pCi/L |
0 |
15 |
2.6 |
1.6 - 3.4 |
2004 |
NO |
Erosion of natural deposits |
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| Combined Radium |
pCi/L |
0 |
5 |
1.48 |
1.3 - 1.7 |
2004 |
NO |
Erosion of natural deposits |
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| Uranium |
ppb |
n/a |
30 |
3.85 |
2.8 - 4.9 |
2004 |
NO |
Erosion of natural deposits |
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| Inorganic
Contaminants |
Units |
MCLG |
AL |
90th percentile
sample value |
# sites
above AL |
Year |
Violation
Yes/No |
Typical
Source of Contaminant |
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| Lead |
ppb |
0 |
15 |
< 5 |
1 of 10 |
2006 |
NO |
Corrosion of household plumbing system |
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| Copper |
ppm |
1.3 |
1.3 |
0.143 |
0 of 10 |
2006 |
NO |
Corrosion of household plumbing system |
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| Volatile
Organic Contaminants |
Units |
MCLG |
MCL |
Average
Level Detected |
Range |
Year |
Violation
Yes/No |
Typical
Source of Contaminant |
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| Total
Trihalomethanes (TTHMs) |
ppb |
n /a |
80 |
7.1 |
7.1 |
2006 |
NO |
By-product of drinking water chlorination. |
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| Haloacetic
Acids (HAA5) |
ppb |
n/a |
60 |
1.3 |
nd - 2.7 |
2004 |
NO |
By-product of drinking water chlorination. |
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| Volatile Organic Contaminants |
Units |
MRDLG |
MRDL |
Average
Level Detected |
Range |
Year |
Violation Yes/No |
Typical Source of Contaminant |
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| Chlorine |
ppm |
4 |
4 |
0.41 |
nd to 0.9 |
2006 |
NO |
Water additive used to control microbes |
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| Source
Assessment Information |
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Summary
of Susceptibility Factors |
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| Source
Name |
Date |
Low |
Med |
High |
Well Location |
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| Bedrock Well # 1 |
3/18/02 |
6 |
5 |
1 |
Located 90' northeast of the pump house |
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| Bedrock
Well # 3 |
3/18/02 |
6 |
5 |
1 |
Located 120' northeast of the pump house |
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| Bedrock
Well # 4 |
3/18/02 |
7 |
4 |
1 |
Located 100' north of the pump house |
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| Bedrock
Well # 5 |
3/18/02 |
8 |
3 |
1 |
Located 275' northwest of the pump house |
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| Bedrock
Well # 6 |
3/18/02 |
9 |
2 |
1 |
Located 310' northwest of the pump house |
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| Bedrock
Well # 7 |
3/18/02 |
8 |
3 |
1 |
Located 437' northwest of the pump house |
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| The complete Assessment Report is available for inspection. For more information call Gary Tetley or
visit NH DES's Drinking Water Source Assessment Program web site at
www.des.state.nh.us/dwspp |
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