| The source of the Avery water supply consist of two wells and a pump house located off Rossini Road in Londonderry, NH. Well #1 is 75' southeast of the pump house and well # 2 is 350' southeast of the PH. Treatment consist of chlorine addition for disinfection, arsenic removal, softeners for hardness removal, aeration for radon removal, and bag filters for sediment removal. | |||||||||||
| AVERY | |||||||||||
| EPA # 1392250 | |||||||||||
| Inorganic Contaminants | Units | MCLG | MCL | Averge Level Detected | Ragne | Date | Violation Yes/No | Typical Source of Contaminant | |||
| Arsenic | ppb | n/a | 10 | 2.1 | nd to 6 | 2006 | NO | Erosion of natural deposits; runoff from orchards; runoff from glass and electronics production wastes. | |||
| Fluoride | ppm | 4 | 4 | 0.3 | n/a | 2004 | NO | Erosion of natural deposits | |||
| Nitrate as Nitrogen | ppm | 10 | 10 | 0.26 | n/a | 2006 | NO | Runoff from fertilizer use; leaching from septic tanks, sewage; erosion of natural deposits. | |||
| Radiological Contaminants | Units | MCLG | MCL | Average Level Detected | Range | Year | Violation Yes/No | Typical Source of Contaminant | |||
| Gross Alpha (Compliance) | pCi/L | 0 | 15 | 2.1 | nd to 5 | 2006 | NO | Erosion of natural deposits | |||
| Combined Radium | pCi/L | 0 | 5 | 0.5 | 0.2 to 1.1 | 2006 | NO | Erosion of natural deposits | |||
| Uranium | ppb | 0 | 30 | 13.3 | nd to 37 | 2006 | NO | Erosion of natural deposits | |||
| Volatile Organic Contaminants | Units | MCLG | MCL | Average Level Detected | Range | Year | Violation Yes/No | Typical Source of Contaminant | |||
| Total Trihalomethanes (TTHMs) | ppb | n /a | 80 | 9 | 4.9 to 15 | 2006 | NO | By-product of drinking water chlorination. | |||
| Haloacetic Acids (HAA5) | ppb | n/a | 60 | 1.3 | n/a | 2004 | NO | By-product of drinking water chlorination. | |||
| Ethylbenzene | ppb | 700 | 700 | 4.1 | nd to 19 | 2006 | NO | Discharge from petroleum factories | |||
| Toluene | ppb | 1,000 | 1,000 | 0.6 | nd to 1.5 | 2006 | NO | Discharge from petroleum factories | |||
| Total Xylenes | ppb | 10,000 | 10,000 | 30 | 0.6 to 120 | 2006 | NO | Discharge from petroleum factories; discharge from chemical factories. | |||
| Volatile Organic Contaminants | Units | MRDLG | MRDL | Yearly Average | Range | Year | Violation Yes/No | Typical Source of Contaminant | |||
| Chlorine | ppm | 4 | 4 | 0.4 | 0.2 to 0.9 | 2006 | NO | Water additive used to control microbes | |||
| Inorganic Contaminants | Units | MCLG | AL | 90th percentile sample value | # sites above AL | Year | Violation Yes/No | Typical Source of Contaminant | |||
| Copper | ppm | 1.3 | 1.3 | 0.176 | 0 | 2006 | NO | Corrosion of household plumbing system | |||
| Source Assessment Information | |||||||||||
| Summary of Susceptibility Factors | |||||||||||
| Source Name | Date | Low | Med | High | |||||||
| Bedrock Well # 1 /75' SE of Pump Station | 9/20/01 | 9 | 2 | 1 | |||||||
| Bedrock Well # 2/350' SE Pump Station | 3/12/02 | 8 | 3 | 1 | |||||||
| 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 | |||||||||||