Quintero Area Water System Water Quality Data (Cont.)

Organics

Analyte	Units	Groundwater Concentrations		EPA Limit MCL	EPA Limit MCLG	Sample Date	Possible Sources
		Range	Highest
Dalapon	mg/L	ND-0.0012	.0012	0.2	0	2006	Discharge from rubber and chemical factories
Dalapon	Some people who drink water containing Dalapon well in excess of the MCL over many years could experience minor kidney changes.

Tested for but not found: Synthetic Organic Chemicals: 2,4-D; 2,4,5-TP (Silvex); Alachlor; Atrazine; Carbofuran; Chlordane; Diquat; Ethylene Dibromochloropropane (DBCP); Ethylene Dibromide (EDB); Heptachlor; Heptachlor Epoxide; Lindane; Benzo (a) Pyrene; Di (2-ethylhexyl) adipate; Dinoseb; 2, 3, 7, 8 TCDD Dioxin; Endothall; Endrin; Glyphosate; Hexachlorobenzene; Hexachlorocycopentadiene; Oxamyl; Picloram; Simazine; Methoxychlor; PCB: Polychlorinated Biphenyls; Pentachlorophenol; Toxaphene.

Tested for but not found: Volatile Organic Chemicals: 1,1-Dichloroethylene; 1,1,1-Trichloroethane; 1,1,2-Trichloroethane; 1,2- Dichloroethane;1,2-Dichloropropane; Benzene; Carbon Tetrachloride; cis-1,2-Dichloroethylene; Chlorobenzene; ortho-Dichlorobenzene; para-Dichlorobenzene; Styrene; Tetrachloroethylene; Toluene; trans-1,2-Dichloroethylene; Trichloroethylene; Vinyl Chloride; 1,2.4- Trichlorobenzene; Dichloromethane.

Radiological

Analyte	Units	Groundwater Concentrations		EPA Limit MCL	EPA Limit MCLG	Sample Date	Possible Sources
		Range	Highest
Radium 226	pCi/L	ND-0.09	.0012	0.2	0	2006	Erosion of natural deposits
Gross Alpha	pCi/L	1.2-5.9	5.9	15	0	2006	Erosion of natural deposits
Uranium	ug/L	4.9-11.7	11.7	30	0	2006	Erosion of natural deposits

Tested for but not found: Gross Beta, Radium 228, Strontium 90 and Tritium.

Radon is a radioactive gas that you cannot see, taste, or smell. It is found throughout the United States. Radon can move up through the ground and into a home through cracks and holes in the foundation. Radon can build up to high levels in all types of homes. Radon can also get into indoor air when released from tap water from showering, washing dishes, and other household activities. Compared to radon entering the home through soil, radon entering the home through tap water will in most cases be a small source of radon in indoor air. Radon is a known human carcinogen. Breathing air containing radon can lead to lung cancer. Drinking water containing radon may also cause increased risk of stomach cancer. If you are concerned about radon in your home, test the air in your home. Testing is inexpensive and easy. For additional information, call your state radon program or call EPA’s Radon Hotline (800-SOS-RADON).

Aesthetics

Analyte	Units	Groundwater Concentrations		EPA Limit MCL	EPA Limit MCLG	Sample Date	Possible Sources
		Range	Highest
Alkanlinty	mg/L	102-291	135	NA	NA	2006	Naturally present
Calcium	mg/L	74-130	51	NA	NA	2006	Erosion of natural deposits
Hardness	Gr/gal	17.5-40.9	25.3	NA	NA	2006	Naturally present
Magnesium	mg/L	29-90	49.6	NA	NA	2006	Erosion of natural deposits
Manganese	mg/L	ND	ND	NA	0.05	2006	Naturally present
Sodium	mg/L	100-110	103	NA	NA	2006	Naturally present

Disinfection Byproducts

Analyte	Units	Groundwater Concentrations		EPA Limit MCL	EPA Limit MCLG	Sample Date	Possible Sources
		Range	Highest
Total Trihalomethanes	ug/L	130-202	135	80	NA	2006	Byproduct of drinking water chlorination
Total Haloacetic Acids	ug/L	20-43	43	60	NA	2006	Byproduct of drinking water chlorination

* Compliance is determined on a running annual average.

Other Analysis

Analyte	Units	Groundwater Concentrations		EPA Limit MCL	EPA Limit MCLG	Sample Date	EPA Limit MRDL	Possible Sources
		Range	Highest
Total Coriforms	C qoo/mL	NR	NR	<1	0	2006	NA	Naturally present
Chlorine Residual	mg/L	NR	NR	4	NA	2006	4	Water additive use to control microbes

* One sample total coliform positive in August. Required repeat samples in August and required increased samples in September were all negative for coliform.