| Redfield
Estates |
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EPA # 0612080 |
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| Inorganic
Contaminants |
Date(s)
Collected |
Highest
Detect |
Range
Detected |
MCL or MRDL |
MCLG or MRDLG |
Violation
Yes/No |
Typical Source of Contaminant |
| Sodium
(ppm) |
11/12/09 |
16.8 |
N/A |
Not Regulated |
N/A |
Natural sources; runoff from use as salt on
roadways; by-product of treatment process |
| Volatile Organic
Contaminants |
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| Chlorine (ppm) |
2010 |
0.47 Avg |
0.3 - 0.75 |
4 |
4 |
No |
Water additive used to control microbes |
| Total
Trihalomethanes (ppb) |
8/9/10 |
10 |
N/A |
80 |
0 |
No |
By-product of drinking water chlorination |
| Haloacetic
Acids (ppb) |
8/9/10 |
1.4 |
N/A |
60 |
0 |
No |
By-product of drinking water chlorination |
| Radiological
Contaminants |
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| Compliance Gross Alpha
(pCi/L) |
2005 |
4.3 |
nd - 4.3 |
15 |
0 |
No |
Erosion of natural deposits |
| Radium
226 & 228 (pCi/L) |
2005 |
1.4 |
0.5 - 1.4 |
5 |
0 |
No |
Erosion of natural deposits |
| Uranium
(ppb) |
2005 |
7.3 |
4.0 - 7.3 |
30 |
0 |
No |
Erosion of natural deposits |
| Radon
(pCi/L) |
4/5/10 |
2,910 |
N/A |
Not Regulated |
N/A |
Erosion of natural deposits |
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Date(s)
Collected |
90th
Percentile |
Action Level |
MCLG |
# of Sites
Sampled |
# Sites Above
Action Level |
Violation
Yes/No |
Typical Source of Contaminant |
| Lead (ppb) |
4/15/09 |
7 |
15 |
0 |
5 |
0 |
No |
Corrosion of household plumbing system |
| Copper
(ppm) |
4/15/09 |
0.370 |
1.3 |
1.3 |
5 |
0 |
No |
Corrosion of household plumbing system |
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| What is the
source of my drinking water? |
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| The sources of the Redfield Estates water supply include two
wells located near the lower pump station off Redfield Circle in East Derry,
NH. Well # 1 is located 10 feet north
of the pump house and well # 4 is located 1,000 feet southeast of the pump
house. Additional sources are six
wells located in the Drew Wood system off Olsen Rd. near Drew Woods Dr. in
East Derry, NH. Treatment consists of
chlorine addition to kill bacteria and phosphate addition to sequester iron
and mangannese and provide corrosion control. |
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| Source Water
Assessment Summary |
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Summary of Susceptibility Factors |
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| Source
Name |
Date |
Low |
Med |
High |
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| Bedrock
Well # 1 |
9/17/01 |
9 |
2 |
1 |
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| Bedrock
Well # 4 |
9/17/01 |
10 |
1 |
1 |
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| The complete Assessment Report is available for
review. For more information call Gary
Tetley at 800-553-5191 ext. 2378 or visit NH Department of Environmental
Services Drinking Water and Groundwater Bureau web site at http://www.des.nh.gov/organization/divisions/water/dwgb/dwspp/reports/index.htm |
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