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/LVWRI7DEOHV                                                                 LL

$FNQRZOHGJPHQWV                                                             LLL

'LVFODLPHU                                                                   LY

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6XUIDFHZDWHUV\VWHPV                                                    

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IURPDOO6WDWHVVWXGLHG                                              

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IURPDOO6WDWHVVWXGLHG                                              

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Appendix C

Table 8.a. Summary of Occurrence of Contaminants Associated with Class V Injection Wells in Public Water Systems Using Ground Water 

from a National Cross Section of States. Ranges from all States Studied.

Chemical Name All States All States X Section X Section % > Range > MRL % > Range > 0.5 MCL* % > Range > MCL*

# of # of # of # of MRL 0.5 MCL* MCL*

Analyses Systems Analyses Systems

Inorganic Compounds

Arsenic 39,629 8,015 36,424 6,588 19.3% 2.5% - 95.9% 1.6% 0.0% - 4.6% 0.9% 0.0% - 2.5%

Barium 37,856 8,037 34,651 6,609 47.3% 31.5% - 98.6% 0.8% 0.0% - 6.9% 0.2% 0.0% - 3.1%

Cadmium 37,905 8,042 34,702 6,615 4.9% 0.4% - 93.9% 1.2% 0.0% - 21.7% 0.6% 0.0% - 1.5%

Chromium 37,898 8,042 34,696 6,615 13.2% 1.3% - 95.7% 0.5% 0.0% - 2.4% 0.2% 0.0% - 0.6%

Cyanide 14,978 5,324 12,504 3,984 2.0% 0.0% - 91.1% 0.5% 0.0% - 1.7% 0.2% 0.0% - 0.8%

Lead (action level; not MCL) 27,578 3,690 27,364 3,661 15.4% 0.0% - 73.3% 4.8% 0.0% - 40.0% 3.1% 0.0% - 26.7%

Mercury 37,929 8,031 34,594 6,582 4.5% 0.4% - 93.3% 0.7% 0.0% - 3.2% 0.4% 0.0% - 2.0%

Selenium 38,065 8,008 34,867 6,581 8.6% 0.5% - 93.3% 0.3% 0.0% - 0.8% 0.2% 0.0% - 0.5%

Silver 28,080 4,135 27,866 4,106 3.5% 0.3% - 16.7% 0.3% 0.0% - 0.6% 0.1% 0.0% - 0.3%

Volatile Organic Compounds

1,1,1-Trichloroethane 149,314 15,960 140,400 12,382 3.3% 1.1% - 19.4% 1.3% 0.0% - 8.8% 1.3% 0.0% - 8.4%

1,1-Dichloroethene 150,962 15,950 142,146 12,380 1.5% 0.0% - 5.0% 1.0% 0.0% - 5.0% 0.9% 0.0% - 5.0%

1,2-Dichloroethane 149,050 15,959 140,218 12,388 1.4% 0.0% - 4.3% 0.6% 0.0% - 2.3% 0.4% 0.0% - 2.3%

Benzene 147,414 15,922 138,814 12,360 1.2% 0.0% - 4.2% 0.5% 0.0% - 1.8% 0.4% 0.0% - 1.8%

Carbon tetrachloride 152,076 15,948 143,260 12,379 1.7% 0.0% - 8.2% 0.6% 0.0% - 1.8% 0.4% 0.0% - 1.8%

Chlorobenzene 90,558 9,999 81,749 6,431 1.0% 0.0% - 3.0% 0.3% 0.0% - 1.0% 0.3% 0.0% - 1.0%

Ethyl benzene 144,574 15,234 135,975 11,675 2.2% 0.5% - 11.2% 0.3% 0.0% - 1.6% 0.1% 0.0% - 0.8%

Methylene chloride (Dichloromethane) 141,887 14,522 132,871 10,939 11.1% 0.0% - 57.8% 3.3% 0.0% - 11.9% 2.3% 0.0% - 11.9%

Tetrachloroethylene (PCE) 160,224 15,298 151,307 11,728 4.3% 0.6% - 14.2% 2.3% 0.1% - 7.6% 1.8% 0.0% - 5.7%

Toluene 144,547 15,252 135,861 11,679 3.8% 0.0% - 14.4% 0.7% 0.0% - 3.8% 0.4% 0.0% - 2.3%

Trichloroethene (TCE) 164,806 15,951 155,842 12,380 3.1% 0.6% - 12.8% 1.8% 0.0% - 6.2% 1.5% 0.0% - 5.5%

Vinyl chloride 146,580 15,938 137,766 12,369 0.5% 0.0% - 3.0% 0.2% 0.0% - 0.6% 0.2% 0.0% - 0.6%

Xylenes (Total) 142,642 15,165 134,041 11,605 3.9% 0.4% - 15.3% 0.2% 0.0% - 1.0% 0.1% 0.0% - 0.8%

Methyl Ethyl Ketone 6,149 3,051 2,987 1,058 0.5% 0.0% - 0.5%

Ground Water Systems

N/A**

* % > MCL indicates the proportion of systems with any analytical results exceeding the concentration value of the MCL; it does**N/A: methyl ethyl ketone does not have an MCL or HAL.

 not necessarily indicate an MCL violation. An MCL violation occurs when the MCL is exceeded by the 

average results from four quarterly samples or confirmation samples as required by the primacy State. 
Appendix C

Table 8.b. Summary of Occurrence of Contaminants Associated with Class V Injection Wells in Public Water Systems Using Surface Water 

from a National Cross Section of States. Ranges from all States Studied.

Chemical Name All States All States X Section X Section % > Range > MRL % > Range > 0.5 MCL* % > Range > MCL*

# of # of # of # of MRL 0.5 MCL* MCL*

Analyses Systems Analyses Systems

Inorganic Compounds

Arsenic 4,981 736 4,420 629 13.0% 0.5% - 100.0% 0.6% 0.0% - 3.0% 0.5% 0.0% - 3.0%Barium 4,796 732 4,235 625 49.1% 22.1% - 100.0% 0.6% 0.0% - 6.1% 0.5% 0.0% - 3.0%

Cadmium 4,788 734 4,226 627 5.1% 0.0% - 100.0% 1.3% 0.0% - 9.1% 0.2% 0.0% - 1.9%

Chromium 4,775 733 4,214 626 10.5% 0.9% - 100.0% 0.3% 0.0% - 0.9% 0.2% 0.0% - 0.5%Cyanide 2,143 566 1,915 452 5.1% 0.0% - 95.7% 0.4% 0.0% - 3.8% 0.0% 0.0% - 0.0%

Lead (action level; not MCL) 3,207 489 3,019 436 18.3% 0.0% - 100.0% 4.6% 0.0% - 100.0% 1.1% 0.0% - 11.8%

Mercury 4,847 745 4,203 625 9.0% 0.0% - 100.0% 1.3% 0.0% - 6.1% 0.5% 0.0% - 1.9%Selenium 4,775 734 4,214 627 11.2% 0.0% - 100.0% 0.2% 0.0% - 3.0% 0.0% 0.0% - 0.0%

Silver 2,833 464 2,645 411 5.1% 0.0% - 27.3% 0.2% 0.0% - 0.5% 0.2% 0.0% - 0.5%

Volatile Organic Compounds

1,1,1-Trichloroethane 12,371 799 11,516 645 7.3% 0.0% - 20.5% 0.9% 0.0% - 18.2% 0.9% 0.0% - 18.2%

1,1-Dichloroethene 12,613 801 11,756 646 2.9% 0.0% - 12.8% 0.3% 0.0% - 6.1% 0.3% 0.0% - 6.1%

1,2-Dichloroethane 12,613 803 11,753 647 3.1% 0.0% - 13.7% 0.3% 0.0% - 3.7% 0.3% 0.0% - 1.9%

Benzene 12,410 797 11,568 644 3.9% 0.0% - 17.1% 0.5% 0.0% - 3.0% 0.3% 0.0% - 3.0%

Carbon tetrachloride 12,432 800 11,577 645 9.0% 0.0% - 37.6% 1.6% 0.0% - 18.2% 1.1% 0.0% - 18.2%

Chlorobenzene 10,814 648 9,960 493 8.1% 0.0% - 31.6% 0.2% 0.0% - 3.0% 0.2% 0.0% - 3.0%

Ethyl benzene 11,765 784 10,921 630 7.3% 0.0% - 17.1% 0.3% 0.0% - 3.0% 0.3% 0.0% - 3.0%

Methylene chloride (Dichloromethane) 11,560 732 10,686 577 25.6% 0.0% - 73.5% 10.4% 0.0% - 28.2% 4.7% 0.0% - 24.2%

Tetrachloroethylene (PCE) 12,405 788 11,550 632 7.1% 0.0% - 16.2% 2.5% 0.0% - 15.2% 1.7% 0.0% - 15.2%

Toluene 11,752 785 10,908 631 11.9% 0.0% - 30.0% 1.0% 0.0% - 7.5% 0.5% 0.0% - 5.7%Trichloroethene (TCE) 12,925 801 12,070 646 5.6% 0.0% - 21.2% 1.9% 0.0% - 21.2% 1.2% 0.0% - 21.2%

Vinyl chloride 12,332 800 11,478 645 3.1% 0.0% - 13.7% 0.3% 0.0% - 3.0% 0.3% 0.0% - 3.0%

Xylenes (Total) 11,184 778 10,340 625 12.3% 1.9% - 29.1% 0.2% 0.0% - 1.9% 0.0% 0.0% - 0.0%Methyl Ethyl Ketone 504 67 485 59 0.0% 0.0% - 0.0%

**N/A: methyl ethyl ketone does not have an MCL or HAL.

Surface Water Systems

N/A**

* % > MCL indicates the proportion of systems with any analytical results exceeding the concentration value of the MCL; it does not necessarily indicate an MCL violation. An MCL violation occurs when the MCL is exceeded by the average results from four quarterly samples or confirmation samples as required by the primacy State.