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March 30, 2015 Lab ID : STK1532135 Paul Abbate Customer : 3-13758 Quality Control - Organic Constituent Method Datelm Type Units Cone. QC Data DQO Note Organic Endrin 625P 03/10/15:202835SG BS ug/L 0.1000 65.2% 7-101 BSD ug/L 0.1000 104% 7-101 436 BSRPD ug/L 0.1000 45.8% 525 410 625P 03/20/15:204597SG CCV ug/L 100.0 123% 70-130 gamma-Chlordane 625P 03110/15:202835SC Blank ug/L ND <0.005 LCS ug/L 0.1000 118% 20-123 BS ug/L 0.1000 105% 1-116 BSD ug/L 0.1000 116% 1-116 BSRPD u L 0.1000 9.2% <_25 625P 1 03/20/15:2045978G CCV I u PJL 100.0 122% 70-130 Heptachlor 625P 03/10/15:202835SG Blank ug/L ND <0.005 LCS ug/L 0.1000 107% 19-119 BS ug/L 0.1000 79.9% 13-100 BSD ug/L 0.1000 96.8% 13-100 BSRPD ug/L 0.1000 19.2% <_25 625P I 03/20/15:204597SG CCV ugIL 100.0 111% 70-130 Heptachlor Epoxide 625P 03/10/15:202835SO Blank ug/L ND <0.005 LCS ug/L 0.1000 129% 18-131 BS ug/L 0.1000 109% 0-127 BSD ug/L 0.1000 133% 0-127 436 BSRPD ug/L 0.1000 1 19.4% <C'S 625P I 03/20/15:204597SG CCV ug/L 100.0 1 123% 70-130 'ndane 625P 03/10/15:20283550 Blank ug/L ND <0.005 LCS ug/L 0.1000 178% 22-181 BS ug/L 0.1000 151% 0-234 BSD ug/L 0.1000 173% 0-234 BSRPD ug/L 0.1000 13.4% <C'5 625P I 03/20/15:204597SO CCV ug/L 100.0 114% 70-130 Methoxychlor 625P 03/10/15:202835SG Blank ug/L ND <0.005 LCS ug/L 0.1000 94.8% 26-113 BS ug/L 0.1000 89.6% 2-107 BSD ug/L 0.1000 96.0% 2-107 BSRPD ug/L 0.1000 7.0% <25 625P I 03/20/15:204597SG CCV ug/L 100.0 124% 70-130 etrachlom-m-xylene 625P 03/10/15:202835SG Blank ug/L 0.1000 39.4% 26-90 LCS ug/L 0.1000 49.4% 26-90 BS ug/L 0.1000 42.5% 26-90 BSD ug/L 0.1000 46.7% 26-90 BSRPD ug/l, 0.1000 9.3% 525 625P 03/20/15:204597SG CCV u L 100.0 120% 70-130 Definition CCV :Continuing Calibration Verification-Analyzed to verify the instrument calibration is within criteria. Blank :Method Blank-Prepared to verify that the preparation process is not contributing contamination to the samples. LCS :Laboratory Control Standard/Sample-Prepared to verify that the preparation process is not affecting analyte recovery. MS :Matrix Spikes-A random sample is spiked with a known amount of analyte.The recoveries are an indication of how that sample matrix affects analyte recovery. MSD :Matrix Spike Duplicate of MS/MSD pair-A random sample duplicate is spiked with a known amount of analyzed.The recoveries are an indication of how that sample matrix affects analyte recovery. BS :Blank Spikes-A blank is spiked with a known amount of analyte.11 is prepared to verify that the preparation process is not affecting analyte recovery. BSD :Blank Spike Duplicate of BS/BSD pair-A blank duplicate is spiked with a known amount of analyte.It is prepared to verify that the preparation process is not affecting analyte recovery. MSRPD :MS/MSD Relative Percent Difference(RPD)-The MS relative percent difference is an indication of precision for the preparation and analysis. Page 14 of 22