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SIERRA LABORATORIES INC <br /> The Park Corporation Date Sampled 4/2I/97 <br /> 8084 Old Auburn Road, Suite E Date Received. 4/24197 <br /> ' Citrus Heights, CA 95610 Date Prepared 4125-4128197 <br /> Date Analyzed- <br /> 4/25-4/28/97 <br /> Sierra Pro l ect No.. 9704-254 Analyst SM <br /> Client Project ID 5007411USA Stockton#110 <br /> Sample Matrix: Water Report Date- <br /> 5/l/97 <br /> EPA METHOD 8020-BTEXI <br /> EPA METHOD 8015 MODIFIED-GASOLINE RANGE HYDROCARBONS (C4-C12) <br /> PURGE AND TRAP <br /> Concentration, l <br /> Method <br /> Client Sample No.- MW-4P MW-6P MW-2P MW-1 Detection <br /> Limit, <br /> Sierra Sample No 6095 6096 6097 6098 l <br /> COMPOUNDS <br /> ' Benzene ND ND 460 24 05 <br /> Toluene ND ND 22 13 05 <br /> Ethylbenzene ND IND 150 16 05 <br /> ' Total Xylenes ND ND 48 5 7 05 <br /> MTBE ND ND ND ND 50 <br /> Gasoline Range ND ND 3300 1400 50 <br /> Dilution Factor 1 1 5 1 QC Limits <br /> 11a Surrogate Recovery, <br /> 4-Bromofluorebenzene 93 94 91 120 70-125 <br /> Quality AssurancelQuality Control Data <br /> ' <br /> LQ C Sam le ID: 9704-243-6049 <br /> LCS QC Spike Spike Dup QC QC <br /> Compounds % Rec Limits % Rec % Rec Limits RPD Limits <br /> ' Benzene 98 80-120 90 95 39-150 5 7 0-30 <br /> Toluene 100 80-120 93 98 46-148 5 8 0-30 <br /> Ethylbenzene 100 80-120 98 100 32-160 1 8 0-30 <br /> Gasoline 100 80-I20 1100 98 50-150 2 7 0-30 <br /> ND means Not Detected <br /> Reporting Limit(RL)=Method Detection Limit(MDL)x Dilution Factor <br />