ODS Renovation – Analyte List Methylene Chloride1,3 Dichlorobenzene 1,1 Dichloroethylene1,4 Dichlorobenzene 1,1 Dichloroethane1,2 Dichlorobenzene Chloroform Bromoform 1,1,1 TrichloroethaneAcrylonitrile Carbon Tetrachloride1,2 Dichloroethane Benzenetrans-1,2 Dichloroethylene Trichloroethylenecis-1,3 Dichloropropene 1,2 Dichloropropanetrans-1,3 Dichloropopene DichlorobromomethaneHexachloro-1,3-butadiene Toluene1,1, 2,2 Tetrachloroethane Tetrachloroethylene1,1,2 Trichloroethane Dibromochloromethane Trichlorofluoromethane EthylbenzeneNapthalene Styrene (co-elutes with o,p xylenes)Chlorobenzene

Elk River/Freedom Industry Release

4-methylcyclohexane methanol, MCHM 7,500 gallons 1 – 2 holes in bottom of tank (rust?) Travels 2.5 miles down Elk, 58 miles down Kanawha, from Ohio River mile 265 – drinking water utilities affected (on Ohio) – 2.5 million people

Elk River/Freedom Industry Release Kanawha River enters Ohio River – 10x dilution factor to MCHM – Ohio River velocity 2 – 3 mph

OHIO RIVER DRINKING WATER INTAKE Thursday, Jan 9 th, 2014 Sunday, Jan 12 th, 1300 Sunday, Jan 12 th, 2139 Monday, Jan 13 th, 0300 Monday, Jan 13 th, 1400 Wednesday, Jan 16 th, 0700 Tuesday, Jan 15 th, 0600 Friday, Jan 17 th, 0530 Sunday, Jan 19 th, 2330 Thursday, Jan 23rd, 1000

Huntington and Cincinnati Data with same 0 start time

Align peak concentrations

Hypothesized Louisville Data (RM 604) Estimated Plume Duration – 12 hrs

Spill Tracking/Spill Response Monitor and communicate NRC reports 24/7 Field activation at the request of states Determine location of spill Characterize contaminant plume – Length, width, breadth, concentration Calculate time of travel/time of arrival at drinking water intakes Provide contaminant sampling and analytical support as needed

ORSANCO Response