Page 9 - Davis Monthan Desert Lightning News 6-5-15

Desert Lightning News June 5, 2015 9

From WATER, Page 8 www.aerotechnews.com/davis-monthanafb

Contaminants MCLG MCL RAA Range Sample Violation Typical Source

Year

Inorganic Contaminant

Arsenic (ppb) 0 10 2.2 1.2-2.6 2013 No Erosion of natural deposits, run offs
2 2 0.061 0.050 - 0.0 2013 No
Barium (ppm) MNR MNR 30 30-32 2013 NA Erosion of natural deposits, industrial use
Erosion of natural deposits
Sodium (ppm) 10 10 1 0.96 – 1.1 2014 No Runoff from fertilizer use; Leaching from septic tanks, sewage;
Nitrate [measured Erosion of natural deposits
as Nitrogen] (ppm)

Radioactive Contaminant

Alpha emitters (pCi/L) 0 15 2.6 1 – 2.9 2012 No Erosion of natural deposits
Erosion of natural deposits
Uranium (pCi/L) 0 30 2.3 1.3 – 2.8 2012 No
Typical Source
Contaminants MCLG AL 90th Sample # Samples
percentile Date Exceeding AL Corrosion of household plumbing systems; Erosion of natural
deposits
Copper - action 0

level at consumer taps 1.3 1.3 0.13 2012
(ppm)

Lead - action 0 15 0 2012 Corrosion of household plumbing systems; Erosion of natural
level at consumer taps 0 deposits
(ppb)

Contaminants Year Annual Monthly Average MRDLG MRDL Typical Source
Sampled Average Range
Chlorine (ppm) Disinfection additive used to control microbes
2014 0.7 0.51 – 0.92 4 4

Unit Description

Term Definition

ug/L Number of micrograms of substance
ppm
ppb Parts Per Million. One ppm equals one milligrams per liter
(mg/L) or 1,000 times more than a ppb
pCi/L
Parts Per Billion. Some constituents in water are measured in
NA very small units. One ppb equals one micrograms per liter (μg/L)

Picocurie Per Liter. It is defined as the quantity of radioactive
material in one liter which produces 2.222 nuclear disintegrations

per minute

Not Applicable

ND Not detected
NR NR: Monitoring not required, but recommended.

DETAILED INFORMATION ON CONTAMINANTS tration.
Haloacetic Acids (HAA5) are a group of chemicals that are formed Total Trihalomethanes (TTHMs) are formed when chlorine com-
along with other disinfection-by-products when chlorine or other
disinfectants used to control microbial contaminants in drinking bines with naturally occurring organic material in water. Since the
water react with naturally occurring organic and inorganic matter in level of organic matter in our groundwater is extremely low, these
water. The regulated haloacetic acid compounds, known as HAA5, compounds are found at very low concentrations. The compounds
are monochloroacetic acid, dichloroacetic acid, trichloroacetic acid, which make up the TTHMs include bromodichloromethane, bromo-
monobromoacetic acid, and dibromoacetic acid. USEPA has estab- form, chlorodibromomethane, and chloroform. Compliance with the
lished an MCL of 60 parts per billion for HAA5. Compliance with TTHM standard is based on the running annual average concentra-
the HAA5 standard is based on the running annual average concen- tion.

Arsenic is a naturally occurring substance commonly found in

See WATER, Page 12