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January 04, 2005 Lab ID : STK438539 San Joaquin County Solid Waste Customer : 3-2956 Quality Control - Inorganic Constituent Method Date/ID Type Units Conc. QC Data DQO Note Metals Mercury 7470A 12/15/2004:A212 LCS ug/L 0.2000 90.5% 85-115 MS ug/L 0.2000 84.5% 75-125 (SP 412773-01) MSD ug/L 0.2000 82.5% 75-125 MSRPD ug/L 2.3% <20 245.1 12/16/2004:A 02-CCB ppt ND <10 02-CCV ppt 200.0 106% 90-110 03-CCB ppt ND <10 03-CCV ppt 200.0 96.5% 90-110 Molybdenum 3010A 12/16/2004:A207 Blank mg/L ND <0.01 LCS mg/L 0.5000 105% 85-115 PDS mg/L 0.5000 108% 75-125 MS mg/L 0.5000 103% 75-125 (SP 412966-01) MSD mg/L 0.5000 102% 75-125 MSRPD mg/L 1.0% :!920.0 6010B 12/20/2004:A 02-CCB mg/L ND <0.01 02-CCV mg/L 1.000 99.2% 90-110 03-CCB mg/L ND <0.01 03-CCV mg/L 1.000 102% 90-110 Nickel 3010A 12/16/2004:A207 Blank mg/L ND <0.01 LCS mg/L 0.8000 105% 85-115 PDS mg/L 0.8000 107% 75-125 MS mg/L 0.8000 103% 75-125 (SP 412966-01) MSD mg/L 0.8000 101% 75-125 MSRPD L mg/L 1.7% <_20.0 6010B 12/22/2004:A 04-CCB mg/L ND <0.01 04-CCV mg/L 1.000 106% 90-110 05-CCB mg/L ND <0.01 05-CCV mg/L 1.000 105% 90-110 Selenium 3010A 12/16/2004:A207 Blank mg/L ND <0.01 LCS mg/L 0.8000 105% 85-115 PDS mg/L 0.8000 104% 75-125 MS mg/L 0.8000 102% 75-125 (SP 412966-01) MSD mg/L 0.8000 99.7% 75-125 MSRPD mg/L 2.0% 520.0 6010B 12/20/2004:A 02-CCB mg/L ND <0.01 02-CCV mg/L 1.000 101% 90-110 03-CCB mg/L ND <0.01 03-CCV mg/L 1.000 104% 90-110 Silver 3010A 12/16/2004:A207 Blank mg/L ND <0.01 LCS mg/L 0.8000 106% 85-115 PDS mg/L 0.8000 108% 75-125 MS mg/L 0.8000 105% 75-125 (SP 412966-01) MSD mg/L 0.8000 102% 75-125 MSRPD mg/L 2.5% <20.0 6010B 12/20/2004:A 02 CCB mg/L ND Report continued on next page... STK438539: Quality Control Page 3