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680 Chesapeake Drive Redwood City CA 94063 0(650)364-9600 FAX(650)364-9233 <br /> Sequoia 404 N yviget Lane Walnut Creek.CA 94598 (925)988-9600 FAX(925)988-9673 <br /> 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)921-9600 FAX(916)921-0100 <br /> q„r Analytical 1455 McDowell Blvd North Ste D Petaluma.CA 94954 (707)792-1865 FAX(707)792-0342 <br /> ATC Associates, Inc Client Project ID Bozzano Property <br /> 1260 Graphics Dnve <br /> Modesto, CA 95351-1502 <br /> Attention Tom Lutterman OC Sample Group 9806E06-03 Reported Aug 2, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Matrix Solid <br /> Method EPA 8020 <br /> Analyst G PESHINA <br /> ANALYTE Benzene Toluene Ethylbenzene Xylenes <br /> QC Batch # GC063098BTEXEXA <br /> Sample No GS9806G93-6 <br /> Date Prepared 6/30/98 6/30198 6130198 6/30/98 <br /> Date Analyzed 6130/98 6130198 6130198 6130198 <br /> Instrument I D # GCHP1 GCHP1 GCHP1 GCHP1 <br /> Sample Conc , mg/Kg N D N D N D N D <br /> Conc Spiked mg/Kg 020 020 020 0 60 <br /> Matrix Spike mg/Kg 019 0 19 020 066 <br /> % Recovery 95 95 100 93 <br /> Matrix <br /> Spike Duplicate mg/Kg 0 18 0 18 019 054 <br /> % Recovery 90 90 95 90 <br /> Relative % Difference 5 4 5 4 5 1 33 <br /> RPD Control Limits 0-25 0-25 0-25 0-25 <br /> LCS Batch# GSBLK063098A <br /> Date Prepared 6130/98 6/30198 6/30198 6/30/98 <br /> Date Analyzed 6130/98 6/30198 6130/98 6/30/98 <br /> Instrument I D # GCHP1 GCHP1 GCHP1 GCHP1 <br /> Conc Spiked mg/Kg 0 20 020 020 060 <br /> Recovery mg/Kg 0 19 0 19 020 056 <br /> LCS % Recovery 95 95 100 93 <br /> Percent Recovery Control Limits <br /> F- <br /> MS/MSD 60140 60140 60140 60140 <br /> LCS 70130 70130 70130 70130 <br /> Quality Assurance Statement All standard operating procedures and quality control requirements have been met <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 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 /> �I Yvan Ki <br /> Project Manager <br />