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<br />CORE LABORATORIES
<br />D U A L I T Y C O N T R O L R E S U L T S
<br />Job Number.: 983261 Report Date.: 12/29/98
<br />CUSTOMER: Greys[one PROJECT: OTRY 484-03 Castillo Cnty ATTN: Nick Mathis
<br />GC Type Description Reag. Code Lab ID Dilution Factor Date Time
<br />Test Methotl........: EPA 602 Batch .............: 42067 Analyst...: dmj
<br />Method Description.: Volatile Organics (Aromatics) Units .............: ug/L
<br />MB Method Blank 12/11/1998 0009
<br />Parameter/Test Description OC Result DC Result True Value Orig. Value Lalc. Result • Limits
<br />Benzene 0.0291 0.5
<br />Ethylbenzene ND 0.5
<br />io(uene ND D.5
<br />%ylenes (total) ND 0.5
<br />LCS Laboratory Control Sample T981210B 12/11/1998 0146
<br />Parameter/Test Description OC Result GC Result True Value Orig. Value Calc. Resu lt • Limits
<br />Benzene 19.004 20.10 94.5 X 39-150
<br />Ethylbenzene 21.427 20.08 106,7 % 32-160
<br />Toluene 21.233 20.08 105.7 Y. 46-148
<br />%ylenes (total) 66.773 60.20 110.9 % 75-125
<br />LLD Laboratory Control Sample Duplicate T9812108 12/11/1998 0234
<br />Parameter/Test Description OC Result OC Result True Value Orig. Value Calc. Resu lt • Limits
<br />Benzene 18.650 19.004 20,10 92.8 Y. 39-150
<br /> 1.9 R 25
<br />Ethylbenzene 20.853 21.427 20.08 103.8 Y. 32-160
<br /> 2.7 R 25
<br />Toluene 20.545 21.233 20.08 102.3 Y. 46-148
<br /> 3.3 R 25
<br />%ylenes (total) 64.822 66.773 60.20 107.7 % 75-125
<br /> 3.0 R 25
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