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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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  1. slide 1

  2. Water captured by supply wells Water-supply system Ambient ground water Drinking water Treatment slide 2

  3. Oahu Hawaii Alaska No VOC Detection VOC Detection slide 3

  4. VOC concentrations in aquifers Detected, above 1 ppb Not detected Detected, below 1 ppb slide 4

  5. 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

  6. 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

  7. 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

  8. Domestic wells Public wells and slide 8

  9. Concentration less than MCL or HBSL Concentration greater than MCL No VOC Detection Oahu Hawaii Alaska slide 9

  10. 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

  11. 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

  12. 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

  13. Summary • Widespread occurrence of VOCs • Concentrations seldom of potential concern • Large number of vulnerable aquifers slide 13

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