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Agenda 04-20-1999 - 2
y Permit # 68-O1 Orange County -Closed Unlined Landfill Partial Monitoring History Detected Volatile Organic Compounds at Concentrations Exceeding Established N.C. Groundwater Standards Date Well Number Chemical Concentration OS-28-92 15 Tetrachloroethene 33 Trichloroethene 16 06-30-93 15 Tetrachloroethene 22.9 Trichloroethene 24.4 11-04-94 15 Tetrachloroethene 15 Trichloroethene 22 20 Vinyl Chloride 26 Benzene 12 12-20-94 15 Trichloroethene 9 Dichloromethane 82B 02-02-95 15 Tetrachloroethene 13 Trichloroethene 19 20 Benzene 13 Vinyl Chloride 20 03-13-95 15 Tetrachloroethene 12 Trichloroethene 13 20 Benzene 8 Vinyl Chloride 20 11-15-95 15 Tetrachloroethene 13 Trichloroethene 14 20 Benzene 8J y-~ -~ ~ ~Y Vinyl Chloride 13J 07-25-96 15 Tetrachloroethene 30 Trichloroethene 33 20 Benzene 8 Vinyl Chloride 43J 02-25-97 15 Tetrachloroethene 23 Trichloroethene 30 20 ~ Benzene 9 Vinyl Chloride 11 09-03-97 15 c-1,1-Dichloroethene 98 Tetrachloroethene 23 Trichloroethene 31 Vinyl Chloride 10 20 Benzene 8 Vinyl Chloride 15 OS-04-98 15 Tetrachloroethene 9 Trichloroethene 21 20 Benzene 6 Vinyl Chloride 10 * =Concentration in parts per billion B =Concentration considered cross-contamination J =Estimated concentration Other compounds (not listed) have been detected at concentrations less than their respective N.C. 2L Groundwater Standard. Orange County -Closed Landfill Permit # 68-01 Partial Monitoring History Detercted Metals at Concentrations Exceeding Established N.C. Groundwater Standards Date Well Number Chemical Concentration OS-28-92 5 Lead 18.3 06-30-93 6 Lead 54 7 Lead 30 03-13-95 5 Lead 40 6 Lead 55 11-15-95 5 .Lead 54J 6 Cadmium 7B Lead 36J 07-25-96 6 Lead 18J 02-25-97 5 Lead 16B 6 Lead 63B 7 Lead 46B Chromuim 93B OS-04-98 5 Lead 37 6 Lead 43 7 Lead 21 B 15 Cadmium 6.2B * =Concentrations in parts per billion B =Concentration considered cross-contamination J =Estimated concentration Other metals (not listed) have been detected at concentrations less than their respective N.C. 2L Groundwater Standard.