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Prepare GWTR rulemaking schedule for meeting March 16
Done: Send revised copy of|K4ACrequests toGary.
Table for Website and Appendix 1 of 2L Rules
Table and Appendix I of Rules. -Send web site updates to Adrienne and Heather J. to put on web site.
-Send out notice to DWQ Rulemaking list -Send out email notification once website updated.
-Prepare GWC Presentation.
Set up meeting with APS to discuss GVVTR. Needed revisions to 2L?
Follow BREDL and Duke Law request to EMC to change 2L rules to put a 6 month deadline for turn
around time on CAP approval (Salsibury area and DOT sites across NC, TCE, benzene, etc). Letter to EPA
(Nov 2010) requesting their help to make DENR address sites.
For IMAC Guidance:
No odor ortaste threshold was found in the literature for diphenyl ether and USEPA has not established
a drinking water maximum contaminant level (MCL) or federal secondary drinking water standard.
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There is inadequate human and animal data to determine if cliphenyl ether is carcinogenic. Because a
cancer potency factor is not available in the literature, an incremental lifetime cancer risk of 1 x 10-6
USEPA's Integrated Risk Information System (IRIS) has established an oral reference dose of 0.002
m8/kg/dayfor Z, 4-dinitruto|uene based on effects on the Central Nervous System, blood, and liver in a
2'yeardog feeding study http://m/w~w.epa.Bo«/ncea/iris/subst/0524.htm. Using this information a
systemic threshold concentration of 10 ug/L (ppb) can be established in accordance with 15A NCAC 2L
Interim maximum allowable concentrations (IMACs) established under 15A NCAC 2L.0202(c) are to be
the "lesser of" the criteria in15AN[A[ZL.OJOJ(d)(1'6). Accordingly, the recommended |WVACfor
diphenV| ether is 100 ug/L(ppb) based on the calculated "non -cancer" systemic threshold
concentration.
U5EPA's Integrated Risk Information System (IRIS) has not established an oral reference dose for
ethanol. IRIS has established an oral reference dose of 0.5 mg/kg/day for methanol, an alcohol
physically and structurally similar but four times astoxic than ethanol
http://bouks.guu0e.com/books?id=_u4sZjHHvv[Y[&|p0=PA244&ot=NYd\N[3[JA8&dq=methano|Y6ZOa
nd%2Dethano|%2DTOX|[ITY&pg=PA244#v=onepage&q=methano|Y62OandY62Oethano|Y62OTOX|OTY&f=fa
Ise ). Using the |R|5 reference dose for methanol (http://vvvvvv.epa.8ov/ncea/iris/subst/0305.htm) as a
conservative surrogate for ethanol, a systemic threshold concentration of 4,000 ug/L (ppb) can be
established inaccordance with lSAN[A[ZL.UJOJ(d)(1).
Due to limitations and uncertainties in the ETBE toxicity database, neither a reference dose nor a cancer
potency factor has been derived. Therefore, neither systemic threshold concentration in accordance
with 15A N[A[ 2L.020I(d)(1) nor an incremental lifetime cancer risk of1x lO'6according tothe
requirements oflSAN[&C2L.U2O2(d)(2)can beestablished. AnEPA IRIS draft toxicological review is
available at
http://cfoub.epa.gov/ncea/cfm/vecordisp|ay.cfm?deid=199331.