| Drew Woods | EPA # 0612150 | ||||||||
| Microbiological Contaminants | Highest # Positive in a month | MCL | MCLG | Violation Yes/No | Typical Source of Contaminant | ||||
| Total Coliform Bacteria | One in Aug and Sept | 1 | 0 | No | Naturally present in the environment | ||||
| Inorganic Contaminants | Date(s) Collected | Highest Detect | Range Detected | MCL or MRDL | MCLG or MRDLG | Violation Yes/No | Typical Source of Contaminant | ||
| Arsenic (ppb) | 1/26/10 4/29/10 7/28/10 10/28/10 | 3 | nd - 3 | 10 | N/A | No | Erosion of natural deposits; runoff from orchards; runoff from glass and electronics production wastes. | ||
| Sodium (ppm) | 7/15/08 | 20 | N/A | Not Regulated | N/A | Natural sources; runoff from use as salt on roadways; by-product of treatment process | |||
| Volatile Organic Contaminants | |||||||||
| Chlorine (ppm) | 2010 | 0.52 Avg | 0.3 - 1.0 | 4 | 4 | No | Water additive used to control microbes | ||
| Total Trihalomethanes (ppb) | 7/28/10 8/9/10 | 8.6 | 7.4 - 8.6 | 80 | 0 | No | By-product of drinking water chlorination | ||
| Radiological Contaminants | |||||||||
| Compliance Gross Alpha (pCi/L) | 2004 | 3.4 | 1.6 - 3.4 | 15 | 0 | No | Erosion of natural deposits | ||
| Radium 226 & 228 (pCi/L) | 2004 | 1.7 | 1.3 - 1.7 | 5 | 0 | No | Erosion of natural deposits | ||
| Uranium (ppb) | 2004 | 3.85 | 2.8 - 4.9 | 30 | 0 | No | Erosion of natural deposits | ||
| Date(s) Collected | 90th Percentile | Action Level | MCLG | # of Sites Sampled | # Sites Above Action Level | Violation Yes/No | Typical Source of Contaminant | ||
| Lead (ppb) | 8/11/09 10/30/09 | < 5 | 15 | 0 | 12 | 0 | No | Corrosion of household plumbing system | |
| Copper (ppm) | 8/11/09 10/30/09 | 0.130 | 1.3 | 1.3 | 12 | 0 | No | Corrosion of household plumbing system | |
| What is the source of my drinking water? | |||||||||
| 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 consists of chlorination for disinfection, aeration to reduce radon levels, and phosphate addition to sequester iron and manganese. | |||||||||
| Source Water Assessment Summary | |||||||||
| Summary of Susceptibility Factors | |||||||||
| Source Name | Date | Low | Med | High | Well Location | ||||
| Bedrock Well # 1 | 3/18/02 | 6 | 5 | 1 | Located 90' northeast of the pump house | ||||
| Bedrock Well # 3 | 3/18/02 | 6 | 5 | 1 | Located 120' northeast of the pump house | ||||
| Bedrock Well # 4 | 3/18/02 | 7 | 4 | 1 | Located 100' north of the pump house | ||||
| Bedrock Well # 5 | 3/18/02 | 8 | 3 | 1 | Located 275' northwest of the pump house | ||||
| Bedrock Well # 6 | 3/18/02 | 9 | 2 | 1 | Located 310' northwest of the pump house | ||||
| Bedrock Well # 7 | 3/18/02 | 8 | 3 | 1 | Located 437' northwest of the pump house | ||||
| 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 | |||||||||