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NCYC Historical Tetrachloroethylene (PCE) Detections <br /> Date of Well No. Well No. Well No. Well No. 4 <br /> Sample 1 2 3 <br /> 12/12/02 -------------------- 1 . 8 ug/1 -------------------- ------------------------ <br /> 8/6/03 6 . 3 ug/1" -------------- -------- <br /> -------------------- <br /> 9/23/03 -------------------- -------------------- 2 . 5 ug/1 ------------------------ <br /> 11/13/03 <br /> -----------------------11/13/03 ------------------- 1 . 1 ug/1 3 . 1 ug/1 <0 . 5 ug/1 <br /> 12/9/03 -------------------- -------------------- -------------------- ND <br /> ---- <br /> 3/9/04 -------------------- 1 . 6 ug/1 -------------------- ------------------------ <br /> 6/8/04 <br /> -----------------------6/8/04 2 . 0 ug/1 5 .2 ug/1 -------------------- ------------------------ <br /> May 19, 2005 letter from the Department directing NCYC to conduct <br /> quarterly PCE monitoring for Wells 1 & 2 <br /> 6/7/OS 0 . 6 ug/1 0 . 5 U9/1 -------------------- ------------------------ <br /> 9/6/OS <br /> -----------------------9/6/05 Not 2 . 8 ug/1 -------------------- ------------------------ <br /> Conducted <br /> ----------------------- <br /> Conducted ---- <br /> 9/27/05 <br /> --- <br /> 9/27/05 Not 2 . 1 ug/1 -------------------- ------------------------ <br /> Conducted (same ---- <br /> quarter as <br /> previous <br /> result) <br /> 12/6/05 1 . 2 ug/1 1 . 7 ug/1 -------------------- ------------------------- <br /> 3/l/06 <br /> -----------------------3/1/06 1 . 8 ug/1 Not -------------------- ------------------------ <br /> Conducted ---- <br /> 6/7/06 <br /> --- <br /> 6/7/06 2 . 1 ug/1 Not -------------------- 0 . 6 ug/1 <br /> Conducted ---- (No <br /> confirmation) <br /> Beginning in Sept 2006, the following monitoring shall be <br /> conducted. <br /> 9/2006 Monitor for Monitor for Monitor for Monitor for <br /> PCE and PCE and PCE and PCE. <br /> *Vinyl *Vinyl *Vinyl <br /> Chloride Chloride Chloride <br /> 12/2006 Monitor for Monitor for Monitor for Monitor for <br /> PCE and PCE and PCE and PCE. <br /> *Vinyl *Vinyl *Vinyl <br /> Chloride Chloride Chloride <br /> 3/2007 Monitor for Monitor for Monitor for If PCE <br /> PCE and PCE and PCE and confirmed, <br /> *Vinyl *Vinyl *Vinyl monitor for <br /> Chloride Chloride Chloride PCE and <br /> *Vinyl <br /> Chloride <br /> 6/2007 Monitor for Monitor for Monitor for (Department <br /> PCE and PCE and PCE and will review <br />