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4W GD Air Testing Inc. www. gdair.com <br /> CLIENT GD Air Testing, Inc GD Air Testing Lab ID GD05-90720-002 <br /> GD05-90720-003 <br /> Report Date 07/20/05 <br /> Date Analyzed 07/20/05 <br /> ' Project No Analyzed by LAJ <br /> Method EPAT014 <br /> REPORT OF BLANK SPIKE RESULTS Page 1 of 1 <br /> SAMPLE DESCRIPTION MATRIX SAMPLE BY SAMPLED DATE /RECEIVED <br /> BS/BSD Air <br /> Spike Control Compounds Spiked Found and Recovery <br /> by BSI by BS R% BSD BSD R% % RPD <br /> rVOLATILE ORGANICS BY EPA TO-14 <br /> Benzene 100 851 851 911 91 1 681 <br /> Toluene 100 861 861 912 912 575 <br /> Ethylbenzene 100 940 94 0 101 101 718 <br /> o-Xylene 100 965 965 104 104 748 <br /> Surrogate Recovery Report <br /> 1,4-Difluorobenzene (SS 1) 5 00 5 Q3 101 4 9$ 100 1 00 <br /> Bromofluorobenzene (SS2) 500 496 992 500 100 080 <br /> The control limit for BS Recovery % of all spiked compound is 70% - 130% <br /> The control limit for relative percentage difference of BS/BSD is 30% <br /> * If any control compound is not within the control limit, please see the case narrative for more details <br /> * The control limit for Surrogate Recovery % of all spiked compound is 70% - 130% Only one is required to pa <br /> Respectfully submitted <br /> GD Air Testing, I <br /> George Dai, P`h <br /> 1 Laboratory Director <br /> Data File gd5973 1/072005 6/07200505 D gd5973 i1072005 8/07200506 D <br /> Report File GDISRIIDIQCO2-TO141GD05-90720-002 <br /> 903 N Bowser Rd , Suite 200, Richardson, rX 75081, USA . I el (972) 480-8908 Fax (972) 480-8308 <br />