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COLUMBIA ANALYTICAL SERVICES,INC. <br /> Analytical Report <br /> Client ARCO Products Company Service Request 59601408 <br /> Project 2168 STOCKTON/21775-234 002/TO#19350 00 Date Collected 8/22/96 <br /> Sample Matrix Water Date Received 8127/96 <br /> Date Extracted NA <br /> BTEX MTBE and TPH as Gasoline <br /> EPA Methods 5030/8020/CaIiforma DHS LUFI'Method <br /> Umts ug/L (ppb) <br /> Sample Name MW-4 (59) MW-5 (55) MW-6 (45) <br /> Lab Code 59601408-004 S9601408-005 S96014084)06 <br /> Date Analyzed 8/30/96 8/30/96 8/30/96 <br /> Anah to MRL <br /> TPH ,is Gasoline 50 79 000 58 000 98 000 <br /> Benzene 05 9,200 8,700 8200 <br /> Toluene 0 5 l 1 000 8,200 7,300 <br /> Ethvlbenzene 0 5 1,800 880 1 600 <br /> Total Xvlenes 0 5 7,400 4,500 9 000 <br /> Methvl Cert-Butvl Ether 3 X700** <500* <1000** <br /> * Raised MRL due to high analvte concentration requiring sample dilution <br /> ** Raised MRL due to matrix interference <br /> "22/060194 <br /> Page 4 <br />