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819 Striker Avenue Suite 8 <br /> Sequoia Sacramento,CA 95834 <br /> (916)921-9600 <br /> FAX(916)921-0 100 <br /> *IWO Analytical www secluolalabs corn <br /> Delta Environmental Consultants(Cameron Park) Project Arco 2130, Stockton,CA <br /> 3330 Cameron Park Dr Ste 550 Project Number N/A Reported <br /> Cameron Park CA, 95682 ProjectManager Jay Johnson 07/03/01 10 41 <br /> Volatile Organic Compounds by EPA Method 8260B - Quality Control <br /> Sequoia Analytical - San Carlos <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 1060124-EPA 5030B (P/T3 <br /> LCS(1060124-BSI) Prepared&,Analyzed 06/27/01 <br /> Benzene 534 20 ug/l 500 107 70-130 <br /> Toluene 485 20 500 970 70-130 <br /> Methyl tert-butyl ether 523 20 500 105 70-130 <br /> Surrogate 12 Dichloroeihane-d4 507 50 0 101 76-114 <br /> Surrogate Toluene-d8 501 500 100 88-110 <br /> Surrogate 4-BFB 481 500 962 86-115 <br /> LCS(1060124-BS2) Prepared&Analyzed 06/27/01 <br /> Benzene 519 20 ug/1 500 104 70-130 <br /> Toluene 525 20 500 105 70-130 <br /> hy1 tort-butyl ether 52 1 20 500 104 70-130 <br /> rogate 1 2-Dichloroe1hane-d4 514 .500 103 76-114 <br /> Surrogate Toluene-d8 51 1 500 102 88-110 <br /> Surrogate 4-3FB 512 " Soo 102 86-115 <br /> Matrix Spike(1060124-MSI) Source L106169-07 Prepared&Analyzed 06/27/0I <br /> Benzene 508 20 ug/l 500 ND 102 60-140 <br /> Toluene 47 7 20 500 ND 954 60-140 <br /> Methyl tort-butyl ether 41 3 20 500 21 784 60-140 <br /> Surrogate 12-Dichloroethane-d4 432 500 864 76-114 <br /> Surrogate Toluene-d8 525 500 105 88-110 <br /> Surrogate 4-BFB 496 500 992 86-115 <br /> Matrix Spike Dup(1060124-MSD1) Source L106169-07 Prepared&Analyzed 06/27/01 <br /> Benzene 507 20 ug/l 500 ND 101 60-I40 0 197 25 <br /> Toluene 508 20 500 ND 102 60-140 629 25 <br /> Methyl tert-butyl ether 357 20 Soo 21 672 60-140 145 25 <br /> Surrogate 12 Drchloroethane-d4 391 500 782 76-114 <br /> Surrogate Toluene d8 509 500 102 88-110 <br /> Surrogate 4-BFB 469 500 1 938 86-115 <br /> --,--ia Analytical -Sacramento The results in this report apply to the samples analyzed in accordance with the chain of <br /> custody document This analytical report must be rept oduced in its entirety <br /> Page 11 of 12 <br />