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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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Slide 1

slide 1


Water supply system

Water

captured

by supply

wells

Water-supply system

Ambient

ground

water

Drinking

water

Treatment

slide 2


Slide 1

Oahu

Hawaii

Alaska

No VOC Detection

VOC Detection

slide 3


Slide 1

VOC concentrations in aquifers

Detected,

above 1 ppb

Not

detected

Detected,

below 1 ppb

slide 4


Slide 1

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


Slide 1

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


Slide 1

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


Slide 1

Concentration less than MCL or HBSL

Concentration greater than MCL

No VOC Detection

Oahu

Hawaii

Alaska

slide 9


Slide 1

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


Slide 1

VOCs with concentrations greater than MCLs

Well type

Compound

Group

Domestic

Public

DBCPX

1,2-DichloropropaneX

EDBX

Fumigants

TCEXX

PCEXX

Methylene chlorideX

Solvents

Chemical

production

1,1-DichloroetheneXX

Vinyl chlorideX

slide 11


Slide 1

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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