DEQ-CFW_00000404

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North Carolina IMAC 'ell
Environmental
Quality C._k�
Chemical Name" , I' Zp 7 0
North Carolina Interim Maximum Allowable Concentration (IMAC) = 100 µg/L
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Summary 'lU C) i C'CC
The North Carolina IMAC for chemical name is based on a noncancer ende �Pint in ac ordance with s ection Reg defn In
15A NCAC 02L .0202. ('o (i
Critical health effect:® f_^
IMAC based on noncancer endpoint
GWQS = [(RfD x WT x RSC) / WI] * 1000 0�
RfD = reference dose' 1.00E-02 mg/kg/day 0.1
WT = average adult human body weight2 70 kg
RSC= relative source contribution 0.2 unitless value
WI = average daily human adult water intake3 �y 2 L/day
1000 = conversion factor / 1000 jig/mg
Calculated GW Standard using noncancer endpoint 70 µg/L 70 011, L
IMAC based on cancer endpoint 70) q oq t431c
GWQS=[(RLxWT)/(q1*xW ]*1000 (0. Q?IWA-)
RL = risk level 1.00E-06 9
WT = average adult human body weight2 70 kg
q1* = carcinogenic potency factor (slope factor)° 0.01 (mg/kg /day)
WI = average daily human adult water intake 2 L/day
1000 = conversion factor 1000 µg/mg r
Calculated GW Standard using cancer endpoint 3.500 µg/L
r
IMAC based on published values
Taste Thresholds NA µg/L
Odor Threshold NA µg/L
Maximum Contaminant Level (MCL)7 NA µg/L�, �\
Secondary Drinking Water Standard (SMCL)6 NA µg/L
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Practical Quantitation Limit (PQL)9 0 µg/L Z� 0a��a
References
' Integrated Risk Information System (IRIS) (hftp://www.epa.gov/iris/ accessed 5117/16). IRIS assessment last revised 9/1/93. Primary reference.
Default EPA value
' Default EPA value
° Chemical name has been classified by EPA as having "suggestive evidence of carcinogenic potential". A cancer potency factor has not been established.
s Young WF, Horth H, Crane R, Ogden T and Arnottt M. 1996. Taste and odour threshold concentrations of potential potable water contaminants. Water Research, 30:2, pp. 331-
340.
6 Amoore, JE and Hautala E. 1983. Odor as an aid to chemical safety: Odor thresholds compared with threshold limit values and volatiles for 214 industrial chemicals in air and
water dilution. Journal of Applied Toxicology, Volume 3. No. 6.
7 MCL: hftps://www.epa.gov/your-drinking-water/table-regulated-drinking-water-contaminants#Organic (accessed 5/2/2016)
e SMCL : hftps://www.epa.gov/dwstandardsregulations/secondary-drinking-water-standards-guidance-nuisance-chemicals
u PQL provided for informational purposes only. PQL not established by North Carolina Water Resources Laboratory. PQL estimated as 0.5 pg/L based on reported MDL of 0.1
pg/L from EPA method 526.
= Not available RS j
RSC = 0.1 for nonorganics, 0.2 for organics
History
May 18, 2010 -Request by ma1ff6 urer to establish NG`WAC for Chemical Name.
December 1, 2010 JMAC of 100 µg}/L approved by DWQ Dir4gltor.
Requester Name and Agency /Date
DEQ-CFW 00000404