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404 N Wiget Lane <br /> Sequoia Walnut Creek CA 94598 <br /> (925)988-9600 <br /> Analytical FAX(925)988-9673 <br /> �,,� <br /> *ettler-Ryan - Dublin Client Project ID Tosco #6981, Stockton <br /> 6747 Sierra Court, Suite J Matrix Vapor <br /> Dublin, CA 94568 <br /> Attention Steve Carter QC Sample Group 9071694-695 Reported Aug 11, 1999 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Benzene Toluene Ethyl Xylenes <br /> Benzene <br /> Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Analyst J Minkel J Minkel J Minkel J Minkel <br /> MS/MSD <br /> Batch# 100NG BTEX 100NG BTEX 10ONG BTEX 100NG BTEX <br /> Date Prepared 7/29/99 7/29/99 7/29/99 7/29/99 <br /> Date Analyzed 7/29/99 7/29/99 7/29/99 7/29/99 <br /> Instrument I D # HP 2 HP-2 HP-2 HP 2 <br /> Conc Spiked 2 0 pg/L 2 Oug/L 2 0 pg/L 6 0pg/L <br /> Matrix Spike <br /> % Recovery SO 75 75 87 <br /> SMatrix Spike <br /> Duplicate% <br /> Recovery 90 80 80 90 <br /> Relative% <br /> Difference 12 65 65 38 <br /> LCS Batch# 2LCS073099 2LCS073099 2LCS073099 2LCS073099 <br /> Date Prepared 7/30/99 7/30/99 7/30/99 7/30/99 <br /> Date Analyzed 7/30/99 7/30/99 7/30/99 7/30/99 <br /> Instrument 1 D# HP 2 HP 2 HP-2 HP-2 <br /> LCS % <br /> Recovery 95 85 95 97 <br /> Recovery <br /> Control Limits 70-130 70-130 70-130 70-130 <br /> Please Note <br /> The LCS is a control sample of known,interferent free matrix that is analyzed using the same reagents, <br /> SEQUOIA ANALYTICAL, #1271 preparation,and analytical methods employed for the samples The matrix spike is an aliquot of sample <br /> fortified with known quantities of specific compounds and subjected to the entire analytical procedure If <br /> recovery of analytes from the matrix spike does not fall within specified control limits due to matrix <br /> interference,the LCS recovery is to be used to validate the batch <br /> P'urcl' <br /> anne Fegley <br /> ject Manager <br /> 9071694 GET <2> <br />