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a—' ) <br /> 1455 McDowell Blvd Nath Ste D <br /> Sequoia uoia Petaluma,CA 94954 <br /> (707)792-1865 <br /> Analytical FAX(707)792-0342 <br /> www sequoialabs com <br /> URS Corp-Sacramento Project Arco Site 2130,Stockton,CA P309471 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number Intnm-50293 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth I0/I6/03 11 59 <br /> VOLATILE FUEL HYDROCARBONS (EPA 503018015M) - Quality Control <br /> Del Mar Analytical,Irvine <br /> Reporting Spike Source %REC RPD <br /> Analyse Result Lunt Units Level Result %REC Limits RPD Limit Notes <br /> Batch 3JO6029-EPA 5030B <br /> Blank(3J06029-BLKI) Prepared&Analyzed 10/06/03 <br /> GRO(C4-C12) ND 50 ug/1 <br /> Surrogate 4-BFB(FID) 939 100 94 65-135 <br /> Laboratory Control Sample(3J06029-BSI) Prepared&Analyzed 10/06/03 <br /> GRO(C4-C12) 203 50 ug/l 220 92 75-135 <br /> Surrogate 4-BFB(FID) 977 100 98 65-135 <br /> Matrix Spike(3J06029-MSI) Source IMJ0204-02 Prepared&Analyzed 10/06/03 <br /> GRO(C4-C12) 195 50 ug/1 220 ND 89 70-135 <br /> Surrogate 4-BFB(FID) 968 100 97 65-135 <br /> Matrix Spike Dup(3J06029-MSDI) Source IMJ0204-02 Prepared&Analyzed 10/06/03 <br /> GRO(C4-C12) 205 50 ug/1 220 ND 93 70-135 5 20 <br /> Surrogate 4-BFB(FID) 981 100 98 65-135 <br /> Batch 3JO7030-EPA 5030B <br /> Blank(3307030-BLKI) Prepared&Analyzed 10/07/03 <br /> CRO(C4-C12) PID 50 ug/l <br /> Surrogate 4-BFB(FID) 834 100 83 65-135 <br /> Laboratory Control Sample(3J07030-BSI) Prepared&Analyzed 10/07/03 <br /> GRO(C4-C12) 197 50 ug/1 220 90 75-135 <br /> Surrogate 4-BFB(FID) 112 100 112 65-135 <br /> Matrix Spike(3JO7030-MS1) Source IMJ0179-01 Prepared&Analyzed 10/07/03 <br /> GRO(C4-C12) 216 50 ug/l 220 ND 98 70-135 <br /> Surrogate 4-BFB(FID) 126 100 126 65 135 <br /> I <br /> Sequoia Analytical-Petaluma The results in this report apply to the samples analyzed in accordance with the chain of <br /> custody document Unless otherwrse stated results are reported on a wet weight basis <br /> This analytical report must be reproduced in its entirety <br /> Page 19 of 30 <br />