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a— ) (71455 McDowell Blvd,North Ste D Sequoia Petaium a,CA 94954 Analytical 07)792-1865 FAX(707)792-0342 www sequoialabs cam URS Corp-Sacramento Project Arco Site 2093,Tracy,CA P503073 2870 Gateway Oaks Dnve Suite 300 Project Number Intrim-50265 Reported Sacramento CA,95833 Project Manager Vernon P Elarth 03/16/05 14 19 ANALYTICAL REPORT FOR SAMPLES Sample ID Laboratory ID Matnx Date Sampled Date Received ATR-I P503073-01 Water 03/02/05 12 10 03/03/05 10 35 ATR-2 P503073-02 Water 03/02/05 13 45 03/03/05 1035 ATR-3 P503073-03 Water 03/02/05 14 50 03/03/05 1035 ATR-4 P503073-04 Water 03/02/05 1230 03/03/05 1035 ATR-5 P503073-05 Water 03/02/05 1500 03/03/05 1035 ATR-6 P503073-06 Water 03/02/05 1325 03/03/05 1035 ATR-7 P503073-07 Water 03/02/05 11 50 03/03/05 1035 ATR-8 P503073-08 Water 03/02/05 1430 03/03/05 1035 ATR-9 P503073-09 Water 03/02/05 13 00 03/03/05 1035 ATR-10 P503073-10 Water 03/02/05 1040 03/03/05 1035 ATR-I 1 P503073 1 Water 03/02/05 11 25 03/03/05 1035 ATR-12 P503073-12 Water 03/02/05 11 00 03/03/05 1035 TB-2093-03022005 P503073-13 Water 03/02/05 00 00 03/03/05 1035 The carbon range for the TPH-GRO has been changed from C6-Cl0 to C4-C12 EPA 8015B has been modified to better meet the requirements of California regulatory agencies These samples were received with intact custody seals MS/MSD is reported for all batches in which the laboratory received sufficient sample volume to perform the MS/MSD analysis In the case where there was insufficient sample volume received for all samples associated in the batch,LCS/LCSD is analyzed in place of the MS/MSD Sequoia Analytical-Petaluma The results in this report apply to the samples analyzed in accordance wrih 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 2 of 19