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680 Chesapeake Drive Redwood City CA 94063 0650) 364-9600 FAX(650) 364-9233 <br /> Sequoia <br /> 404 N Wiget Lane Walnut Creek.CA 94598 (925)988-9600 FAX(925)988 9673 <br /> Analytical <br /> 1nal819 Striker Avenue Suite 8 Sacramento CA 95834 (916)921-9600 FAX(916)921-0100 <br /> Aytical 1455 McDowell Blvd North Ste D Petaluma.CA 94954 (707)792-1865 FAX(707)792-0342 <br /> ATG Associates, Inc Client Project ID Bozzano Property <br /> 1260 Graphics Drive <br /> Modesto, CA 95351-1502 <br /> Attention Tom Lutterman QC Sample Group 9806E06-11, 14 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 # GC062598BTEXEXA <br /> Sample No GS9806C94-8 <br /> Date Prepared 6125198 6125/98 6125198 6125198 <br /> Date Analyzed 6/25/98 6/25/98 6/25198 6125198 <br /> Instrument I D# GCHP1 GCHP1 GCHP1 GCHP1 <br /> Sample Conc , mg/Kg N D N D N D N D <br /> Conc Spiked mg1Kg 020 0 20 020 0 60 <br /> Matrix Spike mg/Kg 026 027 0 27 0 76 <br /> % Recovery 130 135 135 127 <br /> . Matrix <br /> Spike Duplicate, mg/Kg 022 023 023 066 <br /> % Recovery 110 115 115 110 <br /> Relative % Difference 17 16 16 14 <br /> RPD Control Limits 0-25 0-25 0-25 0-25 <br /> LCS Batch# GSBLK062598A <br /> Date Prepared 6/25/98 6/25198 6125198 6125/98 <br /> Date Analyzed 6/25/98 6125/98 6/25/98 6125198 <br /> Instrument I D # GCHP1 GCHP1 GCHP1 GCHP1 <br /> Conc Spiked mg/Kg 020 020 020 060 <br /> Recovery, mg/Kg 0 17 0 18 018 052 <br /> LCS % Recovery 85 90 90 87 <br /> I <br /> Percent Recovery Control Limits <br /> MS/MSD 60140 60140 60140 60140 <br /> LCS 70130 70130 70130 70130 <br /> Quality Assurance Statement All standard operating p g 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 /> K n Kimyal <br /> Project Manager <br /> I <br /> I <br />