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slide 1. Water captured by supply wells. Water-supply system. Ambient ground water. Drinking water. Treatment. slide 2. Oahu. Hawaii. Alaska. No VOC Detection. VOC Detection. slide 3. VOC concentrations in aquifers. Detected, above 1 ppb. Not detected. Detected,

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Water supply system

Water

captured

by supply

wells

Water-supply system

Ambient

ground

water

Drinking

water

Treatment

slide 2


Oahu

Hawaii

Alaska

No VOC Detection

VOC Detection

slide 3


VOC concentrations in aquifers

Detected,

above 1 ppb

Not

detected

Detected,

below 1 ppb

slide 4


0

2

4

6

8

Chloroform was the most frequently detected VOC in aquifer samples

Chloroform

PCE

MTBE

TCE

Toluene

DETECTION FREQUENCY, IN PERCENT

slide 5


0

2

4

6

8

PCE and TCE were also frequently detected in aquifer samples

Chloroform

PCE

MTBE

TCE

Toluene

DETECTION FREQUENCY, IN PERCENT

slide 6


0

2

4

6

8

MTBE was the third most frequently detected VOC in aquifer samples

Chloroform

PCE

MTBE

TCE

Toluene

DETECTION FREQUENCY, IN PERCENT

slide 7


Domestic wells
Domestic wells

Public wells

and

slide 8


Concentration less than MCL or HBSL

Concentration greater than MCL

No VOC Detection

Oahu

Hawaii

Alaska

slide 9


30

0

5

10

15

20

25

concentrations greater than MCLs

Domestic

wells

concentrations below MCLs and HBSLs

Public

wells

DETECTION FREQUENCY, IN PERCENT

slide 10


VOCs with concentrations greater than MCLs

Well type

Compound

Group

Domestic

Public

DBCP X

1,2-Dichloropropane X

EDB X

Fumigants

TCE X X

PCE X X

Methylene chloride X

Solvents

Chemical

production

1,1-Dichloroethene X X

Vinyl chloride X

slide 11


0

2

4

6

8

10

12

THMs in domestic and public wells

Chloroform

Bromodichloromethane

Dibromochloromethane

Domestic

Public

Bromoform

DETECTION FREQUENCY, IN PERCENT

slide 12


Summary
Summary

  • Widespread occurrence of VOCs

  • Concentrations seldom of

    potential concern

  • Large number of vulnerable aquifers

slide 13


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