2007

The sources of the Hi & Lo Estates water supply are two wells located between Taryn Road and Island Pond Road in Derry, NH.  Well # 2 is located 100 feet northwest of the pump house.  Well # 4 is located 334 feet northwest of the pump house.  Treatment consist of greensand filtration to remove iron and manganese, chlorine addition to disinfect the water, and phosphate addition to aid in corrosion control and sequester iron and manganese.
HI & LO ESTATES
EPA # 0612140
Inorganic Contaminants	Units	MCLG	MCL	Level Detected	Range	Year	Violation Yes/No	Typical Source of Contaminant
Barium	ppm	2	2	0.038	n/a	2006	NO	Discharge from drilling wastes; discharge from metal refineries; erosion of natural deposits
Fluoride	ppm	4	4	0.48	n/a	2006	NO	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	1.7	nd - 4.0	2006	NO	Erosion of natural deposits
Combined Radium	pCi/L	0	5	0.3	nd - 0.9	2006	NO	Erosion of natural deposits
Uranium	ppb	0	30	1.3	nd - 2.2	2006	NO	Erosion of natural deposits
Radon	pCi/L	Not Regulated		3,340	2,670 - 3,340	2003	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.
Volatile Organic Contaminants	Units	MRDLG	MRDL	Average Level  Detected	Range	Year	Violation Yes/No	Typical Source of Contaminant
Total Trihalomethanes (TTHMs)	ppb	n /a	80	6	n/a	2006	NO	By-product of drinking water chlorination.
Chlorine	ppm	4	4	0.46	0.0 - 1.3	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
Lead	ppb	0	15	10.0	1 of 10	2006	NO	Corrosion of household plumbing system
Copper	ppm	1.3	1.3	0.45	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 # 2	6/10/05	7	3	2
Bedrock Well # 4	6/10/05	7	3	2
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