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145$McDowell Blvd,North Ste D Sequoia Petaluma,CA 94954 s (707)792-1865 FAX< Analytical wwsequ7ialabs 342 www sequotalahs coni URS Corp-Sacramento Project Arco Site 2130,Stockton,CA P309471 2870 Gateway Oaks Drive Suite 300 Project Number Intrim-50293 Reported Sacramento CA,95833 Project Manager Vernon P Elarth 10/I6/03 11 59 VOLATILE FUEL HYDROCARBONS (EPA 503018015M) Del Mar Analytical,Irvine Reporting i Analyte Result Lrmrt Units Dilution Batch Prepared Analyzed Method Notes MW-1 (P309471-01)Water Sampled 09/23/03 04 52 Received 09/24/03 08 30 GRO(C4-C12) ND 50 ug/1 I 3JO6029 10/06/03 10/07/03 EPA 8015B Surrogate 4-BFB(FID) 85% 65-135 MW-2(P309471-02)Water Sampled 09/23/03 06 50 Received 09/24/03 08 30 GRO(C4-C12) ND 50 ug/1 I 3JO6029 10!06!03 10/07/03 EPA 8015B Surrogate 4-BFB(FID) 92% 65-135 " MW-3(P309471-03)Water Sampled 09/23/03 07 55 Received 09/24/03 08 30 GRO(C4-C12) ND 50 ugll I 3JO6029 10!06!03 10/07/03 EPA 80158 Surrogate 4-BFB(FID) 90% 65-135 " MW-4(P309471-04)Water Sampled 09/23/03 04 06 Received 09/24/03 08 30 GRO(C4-C12) ND 50 ug/l 1 3106029 10/06103 10/07/03 EPA 80158 Surrogate 4-BFB(FID) 81 % 65-135 " wIW-5(P309471-05)Water Sampled 09/23/03 05 56 Received 09/24/03 08 30 GRO(C4-C12) 95 50 ug/1 1 3JO7030 10/07/03 10/07/03 EPA 8015E Surrogate 4-BFB(FID) 78% 65-135 " MW-6(P309471-06)Water Sampled 09/23/03 07 10 Received 09/24/03 08 30 GRO(C4-C12) ND 50 ug/1 1 3107030 10/07/03 10/07103 EPA 80158 Surrogate 4-BFB(FID) 95% 65-135 " MW-7(P309471-07)Water Sampled 09/23/03 03 15 Received 09/24/03 08 30 GRO(C4-C12) ND 50 ug/I I 3JO7030 10/07/03 10/07/03 EPA 8015E Surrogate 4-BFB(FID) 85% 65-135 " " 11 " Sequoia Analytical-Petaluma The results in this report apply to the samples analyzed in accordance with the chain of • custody document Unless otherwise stated results are reported on a wet weight basis This analytical report must be reproduced in its entirety Page 3 of 30