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a_ _� (Blvd, <br /> 707) <br /> 1455 McDowell alurn ,CA Ste D <br /> Sequoia Petaluma,CA 94954 <br /> Analytical FAX 792-1865 <br /> (707)792-0342 <br /> www sequomiabs com <br /> ler-Ryan/Geostrategies(1) Project Unocal(4) <br /> Sierra Court, Suite J Project Number Former Unocal#0187,Stockton Reported <br /> Dublin CA,94568 Project Manager Deanna Harding 05/24/02 16 38 <br /> Total Purgeable Hydrocarbon (C6-C12) by EPA 8015M and BTEX/MTBE by EPA 8021B - Quality Control <br /> Sequoia Analytical - San Carlos <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %R.EC Limits RPD Limit Notes <br /> Batch 2050040-EPA 5030B(P/T <br /> Matrix Spike Dup(2050040-MSDI) Source L205039-04 Prepared&Analyzed 05/18/02 <br /> Xylenes(total) 264 050 ug/l 300 ND 880 60-140 870 25 <br /> Surrogate a,a a-Triuorotoluene 993 100 993 70-130 <br /> Batch 2050042-EPA 5030B (P/T) <br /> Blank(2050042-BLK1) Prepared&Analyzed 05/20/02 <br /> Purgeable Hydrocarbons as Gasoline ND 50 ug/i <br /> Benzene ND 050 " <br /> Toluene ND 050 " <br /> Ethylbenzene ND 050 " <br /> Xylenes(total) ND 050 " <br /> Methyl ten-butyl ether ND 5 0 " <br /> Samugate a,a,a-Trifluorotoluene 9.59 100 959 70-130 <br /> LCS(2050042-SSI) Prepared&Analyzed 05/20/02 <br /> Benzene 103 050 ugll 100 103 70-130 <br /> Toluene 949 050 100 94 9 70-130 <br /> Ethylbenzene 892 050 100 892 70-130 <br /> Xylenes(total) 264 050 300 880 70-130 <br /> Surrogate a a a-Triuorotoluene 105 100 105 70-130 <br /> LCS(2050042-BS2) Prepared&Analyzed 05/20/02 <br /> Purgeable Hydrocarbons as Gasoline 269 50 ug/l 250 108 70-130 <br /> Surrogate aaa-Triuorotoluene 106 " 100 106 70-130 <br /> Matrix Spike 205( SL205041-01 Pared&Analyzed 05/20/02 <br /> _0042-MSI) _ Source rep _ <br /> Purgeable Hydrocarbons as Gasoline 249 50 ug/l 250 ND 996 60-140 <br /> Surrogate a a a-Trifluorwoluene 989 100 989 70-130 <br /> la Analytical -San Carlos The results in this report apply to the samples analyzed in accordance with the chain of <br /> custody document This analytical report must be reproduced in its entirety <br /> Page 23 of 30 <br />