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COULAB CORE LABORATORIES Q U A L I T Y C 0 N T R 0 L R E S U L T S Job Number 981417 Date 09/28/98 CUSTOMER Fluor Daniel GTI PROJECT SL MANTECA 103996304 ATTN Greg Mason QC Type Description Reag Code Lab ID Dilution Factor Date Time CCV Continuing Calibration Verification 08082701 09/26/98 0944 Parameter/Test Description QC Result QC Result True Value Orig Value Catc. Result * Limits lens (total) 57 00 60 95 % 85-115 M8 Method Blank 89/26/98 1605 Parameter/Test Description QC Result QC Result True Value Orig Value Calc. Result * Limits nzene 0 0 5000 Ethylbenzene 0 0 5000 thyt-t-Butyl Ether (MTBE) 0 10 0000 tuene 0 0 5000 lenes (total) 0 00 0 5000 14S Matrix Spike 08082701 981418-9 09/27/98 0330 Parameter/Test Description QC Result QC Result True Value Orig Value Calc Result * Limits ope 19 302 20 0 96 5 7 39-150 enzene 18 338 20 0 91 7 % 32-160 yt-t-Butyt Ether (MTBE) 18 626 20 0 93 1 % 50-150 Toluene 19 131 20 0 95 7 % 46-148 Xilenes (total) 56 64 60 0 00 94 4 % 75-125 i HSD Matrix Spike Duplicate 0808270'i 981418-9 09/27/98 0355 Parameter/Test Description QC Result QC Result True Value Orig Value Calc Result * Limits nzene 19 257 19 257 20 0 96 3 % 39-150 0 R 20 Ethylbenzene 19 402 19 402 20 0 97 0 % 32-160 0 R 20 lthyL-t-ButyL Ether (MTBE) 19 875 19 875 20 0 99 4 % 50-150 0 R 25 Toluene 19 417 19 417 20 0 97 1 % 46-148 �lenes (total) 57 90 57 90 60 0 00 96 5 X 75-125 0 R 20 CCV Continuing Calibration Verification 08082701 09/27/98 0445 Parameter/Test Description QC Result QC Result True Value Orig Value Calc Result * Limits nzene 18 942 20 95 Y. 85-115 hylbenzene 20 321 20 102 Y 85-115 thyl-t-Butyl Ether (MTBE) 20 445 20 102 % 85-115 Toluene 19 472 20 97 % 85-115 Xtenes (total) 58 90 60 48 / 85-115 Page 8 s. * %-% REC R-RPD A-ABS Diff D % Diff %Wr,ea ,xri,r ra ,v a nn M, m�, r ea 1 r In ,Iv w e ews r y,1 u tR 9+1,q na.-,xiyd [ lyln r,)1 Cnr5L ,rwn,1,xnl 11 p n.n wit f.. r c ,rs bA3 d i 1 5 — u c rn%r nlf