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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (415) 364 9600 FAX(415) 364 9233 <br /> 404 N Wiget Lane Walnut Creek CA 94598 (510) 988 9600 FAX(510)988 9673 <br /> Analytical 819 Striker Avenue,Suite 8 Sacramento CA 95834 (916) 921 9600 FAX (916) 921 0100 <br /> i <br /> Ground Zero Analysis, Inc Client Project ID Pestana Reeve's Exxon, 95-036 <br /> 2291 West March Lane, Ste 127D Matrix Solid <br /> Stockton, CA 95207 <br /> Attention John Lane Work Order# 9707705 -01-04 Reported Jul 28, 1997 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes Gas <br /> Benzene <br /> QC Batch# GC071697BTEXE)(A GC071697BTEXEXA GC071697113TD(D(A GC071697BTEXEXA GC071697BTEXEXA <br /> Analy Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 EPA S015M <br /> Prep Method EPA 5030 EPA 5030 EPA 5030 EPA 5030 EPA 5030 <br /> Analyst J Heider J Heider J Heider J Helder J Heider <br /> MS/MSD# 970742703 970742703 970742703 970742703 970742703 <br /> Sample Cone 0 010 0 010 0 010 010 021 <br /> Prepared Date 7/16/97 7/16/97 7/16/97 7/16/97 7/16/97 <br /> Analyzed Date 7/16/97 7/16/97 7/16/97 7/16/97 7/16/97 <br /> Instrument I D # GCHP7 GCHP7 GCHP7 GCHP7 GCHP7 <br /> Cone Spiked 0 20 mg/Kg 0 20 mg/Kg 0 20 mg/Kg 0 60 mg/Kg 1 2 mg/Kg <br /> Result 018 017 018 057 1 3 <br /> MS %Recovery 85 80 85 78 91 <br /> Dup Result 017 016 017 057 13 <br /> MSD % Recov 80 75 80 78 91 <br /> RPD 57 61 57 00 00 <br /> RPD Limit 0-25 0-25 0-25 0-25 0-25 <br /> LCS # BLK071697 BLK071697 BLK071697 BLK071697 BLK071697 <br /> Prepared Date 7/16/97 7/16/97 7/16/97 7/16/97 7/16/97 <br /> Analyzed Date 7/16/97 7/16/97 7/16/97 7/16/97 7/16/97 <br /> Instrument I D # GCHP7 GCHP7 GCHP7 GCHP7 GCHP7 <br /> Cone Spiked 0 20 mg/Kg 0 20 mg/Kg 0 20 mg/Kg 0 60 mg/Kg 1 2 mg/Kg <br /> LCS Result 016 016 016 048 11 <br /> LCS % Recov 80 80 80 80 92 <br /> 60-140 60-140 60-140 60-140 60-140 <br /> LCS 70-130 70-130 70-130 70-130 70-130 <br /> Control Limits <br /> Please Note <br /> The LCS is a control sample of known interferent-free matrix that 1s analyzed using the same reagents, <br /> 0 SE 1 ANALYTICAL 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 /> the 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 /> t P genner <br /> P Jct Manager **MS=Matrix Spike,MSD=MS Duplicate,RPD-Relative%Difference 9707705 GGG <1> <br />