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OULAB CORE LABORATORIES Q U A L I T Y C O N T R O L R E S U L T S Job Number 981249 Date 08/31/98 CUSTOMER Fluor Daniel GTI PROJECT STHL\#20632 ATTN Greg Mason QC Type Description Reag Code Lab 1D Dilution Factor Date Time Test Method EPA 8020A Batch 2637 Analyst sdg Method Description Volatile Organics -Aromatics Units ug/L IV Initial Calibration Verification 8020 08n30501A 08/27/98 1007 . Parameter/Test Description QC Result QC Result True Value Orig Value Calc Result * Limits enzene 22 198 20 111 % 85-115 Ethylbenzene 20 431 20 102 % 85-115 ethyl-t-Butyl Ether (MTBE) 34 450 20 172 % 70-130 oluene 20 317 20 102 % 85-115 ylenes (total) 64 28 60 107 % 85-115 MB Method Blank 08/27/98 1037 Parameter/Test Description QC Result OC Result True Value Orig Value Calc Result * Limits enzene 0 0 5000 ylbenzene 0 0 5000 yl-t-Butyl Ether (MTBE) 8 140 10 0000 luene 0 0 5000 Xylenes (total) 0 00 0 5000 CV Continuing Calibration Verification 08030501A 08/27/98 0614 Parameter/Test Description QC Result QC Result True Value Orig Value Calc Result * Limits Benzene 23 138 20 116 D 85-115 Ethylbenzene 20 705 20 104 D 85-115 Methyl-t-Butyl Ether (MTBE) 33 970 20 170 D 70-130 �oluene 21 889 20 109 D 85-115 ylenes (total) 66 22 60 110 D 85-115 CV Continuing Calibration Verification 08030501A 08/28/98 0016 Parameter/Test Description QC Result QC Result True Value Orig Value Calc Result * Limits Benzene 24 957 20 125 D 85-115 Nthylbenzene 21 753 20 109 D 85-115 ethyl-t-ButyL Ether (MTBE) 36 706 20 184 D 70-130 oluene 22 978 20 115 D 85-115 Xylenes (total) 69 11 60 115 0 85-115 CV Continuing Calibration Verification 08030501A 08/28/98 0518 Parameter/Test Description QC Result QC Result True Value Orig Value Calc Result * Limits 4enzene 26 585 20 133 D 85-115 thyLbenzene 22 855 20 114 D 85-115 yl-t-Butyl Ether (MTBE) 36 088 20 180 D 70 130 ene 24 353 20 122 D 85 115 Page 5 * %-% REC R-RPD A-ABS Diff D-/ Diff