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1, 0 UAL I T Y C O N T R O L R E S U L T S Job Number 20027$ Report Date.. 02/18/2000 CUSTOMER IT Group PROJECT- Southland - Martinez ATTN Rhonda Teicheira OC Type Description Reag Code Lab ID Dilution factor Date Time LCD Laboratory Control Sample Duplicate 09111502 02/10/2000 1338 Parameter/Test Description QC Result ®C Result True Value Orig Value Calc. Result * Limits F Benzene 46 66 46 66 50 93 3 39-1500 0 0 20 Ethylbenzene 45 16 44 89 50 90 3 32-160 0 6 20 ethyl-t-Butyl Ether (MTBE) 260.85 270 09 250 104 3 50-150 3 5 25 Toluene 45 76 45 76 50 91 5 46-148 0 0 20 ly 0 8 tenes (total) 137 63 136 73 150 92075-125 MB Method Blank 02/10/2000 1547 Parameter/Test Description QC Result QC Result True Value Orig Value Calc Result * Limits F 6-t-Butyl e 0 00 enzene 0 00 Ether (MTBE) 0 00 Toluene 0 00 Xylenes (total) 0 00 CV Calibration Verification 09111501 02/10/2000 2005 Parameter/Test Description QC Result OC Result True Value Orig Value Calc Result * Limits F Benzene 44 74 50 89 85-115 Ethylbenzene 44 44 50 89 85-115 Methyl-t-Butyl Ether (MTBE) 262 72 250 105 70-130 oluene 44 76 50 90 85-115 ylenes (total) 133 07 150 89 85-115 CV Calibration Verification b91115D1 02/10/2000 2057 Parameter/Test Description OC Result OC Result True Value Orig Value Calc Result * Limits F Benzene 45 25 50 90 85-115 tthylbenzene 44 54 50 89 85-115 ethyl-t-Butyl Ether (MTBE) 268 53 250 107 70-130 oluene 45 20 50 90 85-115 Xylenes (total) 132 86 150 89 85-115 kM S Matrix Spike 09111501 200305-1 fl2/10/20fl0 2306 Parameter/Test Description OC Result OC Result True Value Orig Value Calc Result * Limits F enzene 368 47 50 308 20 120 5 39-150 t lbenzene 57 73 50 13 13 89 2 32-160 -t-Butyl Ether (MTBE) 8280 25 250 8319 82 -15 8 50-150 X e 54 92 50 9 92 90 0 46-148 ylenes (total) 151 09 150 15 60 90 3 75-125 Page 10 * =X REC, R=RPD, A=ABS Diff , D=% Diff