| The source of the Farmstead water supply is the Farmstead Well and Pump House located on Senter Cove Road in Derry, NH. The well is located 170' north of the pump house. Treatment consists of chlorination for disinfection, arsenic removal filters, and the addition of a blended phosphate for corrosion control and sequestration of iron and manganese. | ||||||||||||||||||
| FARMSTEAD | ||||||||||||||||||
| EPA # 0612110 | ||||||||||||||||||
| Inorganic Contaminants | Units | MCLG | MCL | Average Level Detected | Range | Year | Violation Yes/No | Typical Source of Contaminant | ||||||||||
| Arsenic | ppb | n/a | 10 | 3 | nd to 6 | 2006 | NO | Erosion of natural deposits; runoff from orchards; runoff from glass and electronics production wastes. | ||||||||||
| Barium | ppm | 2 | 2 | 0.012 | 0.012 | 2006 | NO | Discharge from drilling wastes; discharge from metal refineries; erosion of natural deposits | ||||||||||
| Fluoride | ppm | 4 | 4 | 0.63 | 0.63 | 2006 | NO | Erosion of natural deposits | ||||||||||
| Volatile Organic Contaminants | Units | MCLG | MCL | Level Detected | Range | Year | Violation Yes/No | Typical Source of Contaminant | ||||||||||
| Total Trihalomethanes (TTHMs) | ppb | n /a | 80 | 21.3 | n/a | 2004 | NO | By-product of drinking water chlorination. | ||||||||||
| Haloacetic Acids (HAA5) | ppb | n/a | 60 | 2.6 | n/a | 2004 | NO | By-product of drinking water chlorination. | ||||||||||
| Volatile Organic Contaminants | Units | MRDLG | MRDL | Average Level Detected | Range | Year | Violation Yes/No | Typical Source of Contaminant | ||||||||||
| Chlorine | ppm | 4 | 4 | 0.4 | nd to 0.5 | 2006 | NO | Water additive used to control microbes | ||||||||||
| Radiological Contaminants | Units | MCLG | MCL | Level Detected | Range | Year | Violation Yes/No | Typical Source of Contaminant | ||||||||||
| Gross Alpha (Compliance) | pCi/L | 0 | 15 | 2.3 | 1.8 to 2.3 | 2005 | NO | Erosion of natural deposits | ||||||||||
| Combined Radium | pCi/L | 0 | 5 | 2.3 | 1.2 to 2.3 | 2005 | NO | Erosion of natural deposits | ||||||||||
| Uranium | ppb | 0 | 30 | 1.8 | 0.9 to 1.8 | 2005 | NO | Erosion of natural deposits | ||||||||||
| Radon | pCi/L | Not Regulated | 3,410 | n/a | 2001 | n/a | Erosion of natural deposits | |||||||||||
| Radon is a radioactive gas that you can't see, taste or smell. It can move up through the ground and into a home through cracks and holes in the foundation. Radon can also get into indoor air when released from tap water from showering, washing dishes, and other household activities. It is a known human carcinogen. Breathing radon can lead to lung cancer. Drinking water containing radon may cause an increased risk of stomach cancer. Presently EPA is reviewing a standard for radon in water. | ||||||||||||||||||
| Lead and Copper | Units | MCLG | AL | 90th percentile sample value | # sites above AL | Year | Violation Yes/No | Typical Source of Contaminant | ||||||||||
| Lead | ppb | 0 | 15 | < 5 | 1 of 10 | 2006 | NO | Corrosion of household plumbing system | ||||||||||
| Copper | ppm | 1.3 | 1.3 | 0.343 | 0 of 10 | 2006 | NO | Corrosion of household plumbing system | ||||||||||
| Source Assessment Information | ||||||||||||||||||
| Summary of Susceptibility Factors | ||||||||||||||||||
| Source Name | Date | Low | Med | High | ||||||||||||||
| Bedrock Well # 1 | 3/18/02 | 8 | 0 | 4 | ||||||||||||||
| 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 | ||||||||||||||||||