DEQ-CFW_00058037

2/3/15
Estimated Agricultural Use for Dichlorapropene 2009
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U.S. Geological Survey Data Series 752, 2013
• Solvent stabilizer, industrial solvent, and a by-product
of manufacturing processes involving ethylene oxide
Probable human carcinogen. One in a million cancer
risk associated with a 1,4-dioxane concentration of
0.35 lug/L (EPA IRIS database)
• Detected nationwide in 11.6% of 18,549 lJCMR3
samples (as of October 2014)
• In surface waters, wastewater discharges can be
important sources — control through discharge
permits rather than focusing on drinking water
regulation only?
9339ma=.
Vanadium
200.9
0.2
327 (max 6.9 lug/L)
Molybdenum
200.8
1
63 (max 17 jig/L)
Cobalt
200.8
1
37 (max &2 ilg/L)
Strontium
200.8
03
856 (max. 650 itg/L)
Chromium
200.8
0.2
196 (max 16 itg/L)
Chromium VI
2183
0,02
581 (max 3.6 jAg/L)
Chlorate
30011
20
600 (max 22,000 pg/L)
• 1,4-Dioxane
75 detects in 516 NC samples (14,5%)
17 out of 88 PWSs in NC had detects (19.3%)
6 of the 10 highest concentrations in the national
LICMR3 database represent NC sampfes
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Chlorate concentrations exceeded EPA reference
level of 210 ppb in 28% of samples collected in NC
90
/8�37MC samples
1 79
Po
J Possible sources:
rt
E 50
28 1. Hypo'ochlorlte degradation
40 30C1- -> ClOi- + 20-
2. Chlorine dioxide use
3. Industrial wastewater
1.000 10,000 190,000
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DEQ-CFW-00058037