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Sequoia 680 Chesapeake Drive Redwood Ciry CA 94063 (650)364-9600 FAX(650)364 9233 <br /> 404 N Wrget Lane Walnut Creek CA 94598 (925)988-9600 FAX(9Z5)988 9673 <br /> Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)921-9600 FAX(916)921 0100 <br /> ' 1455 McDowell Blvd North Ste D Petaluma,CA 94954 (707)792-1865 FAX(707)792-0342 <br /> 1 SS1 Industrial Road San Carlos,CA 94070 4111 (650)232-9600 FAX(650)232 9612 <br /> Ground Zero Analysis, Inc Client Project ID Knowles Roek <br /> 1714 Main St <br /> Escalon, CA 95320 <br /> Attention Greg Stahl QC Sample Group 9904784 Reported Apr 23, 1999 <br /> QUALITY CONTROL DATA REPORT <br /> ' Matrix Liquid <br /> Method EPA 8020 <br /> ' Analyst N H <br /> ANALYTE Benzene Toluene Ethylbenzene Xylenes <br /> ' QC Batch # GC042199BTEX02A <br /> Sample No 9904836-3 <br /> Date Prepared 4121199 4121199 4121199 4121199 <br /> ' Date Analyzed 4121199 4121199 4121199 4121199 <br /> Instrument I D # GCHP02 GCHP02 GCHP02 GCHP02 <br /> Sample Cone ug/L N D N D N D N D <br /> ' Cone Spiked, uglL 10 10 10 30 <br /> Matrix Spike, ug1L 94 9 4 9 3 28 <br /> % Recovery 94 94 93 93 <br /> Matrix <br /> Spike Duplicate uglL 9 5 9 4 9 3 28 <br /> % Recovery 95 94 93 93 <br /> ' Relative % Difference 1 1 0 0 0 0 0 0 <br /> ' RPD Control Limits 025 0-25 0-25 0-25 <br /> ' LCS Batch# GC042199BTEX02A <br /> Date Prepared 4121199 4121199 4121199 4/21199 <br /> Date Analyzed -;21,'99 4%21199 412l/99 4121199 <br /> ' Instrument i D# GCHP02 GCHP02 GCHP02 GCHP02 <br /> Cone Spiked, uglL 10 10 10 30 <br /> ' LCS Recovery, ug/L 9 1 9 1 9 1 27 <br /> LCS % Recovery 91 91 91 90 <br /> Percent Recovery Control Limits <br /> MSIMSD 60140 50140 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 speahc 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 /> Me i Sh <br /> Project <br /> ' <br /> ager <br /> 1 <br />