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Citation No. 05-10-07C-004 <br />NCYCc <br />Page 4 <br />2 The Department has been aware of the presence of various organic chemicals in <br />3 NCYCC's active wells at concentrations less than their respective MCLS. In addition to <br />4 PCE, some wells have had sporadic detections of Trichloroethylene (TCE) and some <br />5 <br />unregulated organic chemicals. <br />6 <br />7 Subsequent to the most recent August 23, 2006 inspection of the facility by the <br />8 Department, all four wells were placed on quarterly monitoring for PCE and Vinyl <br />9 Chloride. However, the monitoring results of March 26, 2007 were the first indication of <br />10 an exceedence of the PCE MCL in any of the active wells. All Vinyl Chloride results <br />Z1 have been non -detect. The following table -shows the PCE detections within the past <br />12 several years: <br />13 Historical Tetrachloroethylene (PCE) Detections <br />14 <br />15 <br />16 <br />17 <br />18 <br />19 <br />20 <br />21 <br />22 <br />23 <br />OA <br />Well No. 1 <br />Well No, 2 <br />Well No. 3 <br />Well No. 4 <br />2.0 ug/I (6/8/04) <br />1.6 ug/I (319/04) <br />6.3 ug/I (8/6/03) <br />0.60 ug/1 (6/7/06) <br />0.60 ug/l (6/7/05) <br />5.2 ug/I (6/8/04) <br />3.1 ugA (11/13/03) <br />1.4 ug/1 (9/27/06) <br />1.2 ug/I (12/6/05) <br />2.8 ugA (9/6/05) <br />3.9 ugA (9/27/06) <br />1.4 ug/I (12/13/06) <br />1.3 (2/21/07)ug/l <br />1.8 ug/I (3/1/06) 1.7 ugll (12/6/05) 17 ug/I (2/21/07) <br />2.1 ug/l (6/7106) <br />••oOne <br />5.4 u911 (9/20/06) <br />3.9 1 lgA (11/1/06) <br />3.4 ug/I (2121/07) <br />17 ug/I (3/7/07) <br />16 ug/I (4/12107) <br />1.6 ug/I (317/07) <br /><0.50 ug/l (4112/07) <br />-Owe <br />2.9 ug/I (317/07) <br />8.8 ug/l (4/12107) <br />**Well No. I has been offline due 10 mechanical problems since August 2066. <br />25 <br />26 <br />27 <br />COUNT PAPER <br />o► "LIFORNIA <br />'TO. 103 iflEv. <br />85 347ag <br />