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a— ) ]455 McDowell Blvd North Ste P <br /> Sequoia Petaluma,CA 94954 <br /> a�� (707)792-1865 <br /> Analytical <br /> FAX(707)792-0342 <br /> www sequoialabs com <br /> URS Corp-Sacramento Project BP Heritage Site 11191,Stockton,Ca P410091 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number WR36368 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 10/15/04 15 22 <br /> Purgeable Hydrocarbons by EPA 8015B - Quality Control <br /> Sequoia Analytical-Petaluma <br /> Reporting Spike Source °/uREC RPD <br /> Analyte Result limit Units Level Result °/uREC Limits RPD Limit Notes <br /> Batch 4100180-EPA 5030B,waters/EPA 8015B-VOA <br /> Blank(4100180-BLK1) Prepared&Analyzed 10/08/04 <br /> Gasoline Range Organics(C4-C12) ND 50 uo <br /> Surrogate 4-Bromofl'uorobenzene 272 " 300 91 804-110 <br /> Laboratory Control Sample(4100180-BS1) Prepared&Analyzed 10/08/04 <br /> Gasoline Range Organics(C4-C12) 2670 50 ug/1 2750 97 67-101 <br /> Surrogate 4-Bromofluorobenzene 292 300 97 804-110 <br /> Matrix Spike(4100180-MSI) Source P410088-07 Prepared&Analyzed 10/08/04 <br /> Gasoline Range Organics(C4-C 12) 2410 50 ug/l 2750 ND 88 67-101 <br /> Surrogate 4-Bromofluorobenzene 272 300 91 804-110 <br /> _Matrix mike Dup(4100180-MSDI) Source P410088-07 Prepared&Analyzed 10/08/04 <br /> Gasoline Range Organics(C4-C12) 2440 50 ug/l 2750 ND 89 67-101 1 24 <br /> arrogate 4-Eomofluorobe-ene 283 300 94 804-110 <br /> Batch 4100248-EPA 5030B,waters/EPA 8015B-VOA <br /> Blank(4100248-BLK1) Prepared&Analyzed 10/12/04 <br /> Gasoline Range Organics(C4-C12) ND 50 ug/l <br /> Surrogate 4-Bromofluorobenzene 299 " 300 100 804-110 <br /> Laboratory Control Sample(4100248-BSI) Prepared&Analyzed 10/12/04 <br /> Gasoline Range Organics(C4-C 12) 2620 50 ug/l 2750 95 67-101 <br /> Surrogate 4-Bromofluorobenzene 321 300 107 804-110 <br /> Matrix Spike(4100248-MSI) Source P410131-01 Prepared&Analyzed 10/12/04 <br /> Gasoline Range Organics(C4-C12) 2600 50 ugll 2750 ND 95 67-101 <br /> Surrogate 4-Bromofluorobenzene 315 300 105 804-110 <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 otherwise staled results are reported on a wet weight basis <br /> This analytical report must be reproduced in its entirety <br /> Page 8 of 12 <br />