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1 S[ERRA LABORATORIES tNc <br /> IPGHH Engineers, Inc Date Sampled 10/20/98 <br /> 8084 Old Auburn Road, Suite E Date Received <br /> Citrus Hieghts, CA 95610 10/21/98 <br /> Date Prepared 10/24/98 <br /> Date Analyzed 10/24/98 <br /> Sierra Protect No 9810-351 Analyst SM <br /> Client Project ID. USA-Stockton <br /> Sample Matrix- Water Report Date 11/2/98 <br /> EPA METHOD 8020-BTEX/EPA METHOD 8015-Gasoline Range Hydrocarbons(C4-C12) <br />' (Purge & Trap} <br /> Concentration,ug/L <br /> Client Sample No MW-4P MW-6P MW-3P MW-I MW-21? 2 MW-1 P MW- Method <br />' Detection <br /> Sierra Sample No 15695 15696 15697 15698 15699 15700 15701 Limit, <br /> C <br /> o 'P <br /> ug/L <br /> ND 0 50 ND 0 66 650* 1 6 ND <br /> ND I0 ND 4 8 15 ND _ ND 0 5 <br /> zene ND 083 ND ND 55ND ND 0 5 <br />' Total Xylenes ND I 1 ND 068 16 ND ND 05 <br /> MTBE ND ND ND ND ND ND ND 05 <br /> 50 <br /> Gasoline ND 420 ND 220 3700 ND ND <br /> 50 <br /> Dilution Factor I I I 1 1 , 50* 1 1 <br /> %Surrogate Recovery QC Limits <br />' 4-Bromotluorobenzene 96 110 105 105 105110 105 <br /> 70-125 <br />' QC Sample ID 9810-516-16895 Quality Assurance/Quality Control Data <br /> LCS S ikeP p QC <br /> ' <br /> QC <br /> Compounds % ec Re % Ra Re Du Li r � Limits RPD Limits <br /> Benzene 96 95 99 39-150 4 I <br /> Toluene 97 97 0-30 <br /> 100 46-148 3 6 0-30 <br /> Ethylbenzene 98 100103 32-160 2 5 <br /> ' Gasoline I07 100 97 50-150 '32 0-30 <br /> 0-30 <br /> ND means Not Detected <br /> ' Reporting Limit(RL)=Method Detection Lima(MDL)x Dilution Factor <br /> 1 <br />