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' 680 Chesapeake Drive Redwood City CA 94063 (650)364-9600 FAX(650)364-9233 <br /> Sequoia 404 N Wiget Lane Walnut Creek CA 94598 (925)988 %00 FAX(925)988-9673 <br /> A��ly i�a 819 Striker Avenue Suite 8 Sacramento CA 95634 (916)921-9600 FAX(916)921 0100 <br /> ' Ci 1455 McDowell Blvd North Ste D Petaluma CA 94954 (707)792 1865 FAX(707)792 0342 <br /> Ground Zero Analysis, Inc Client Project ID 96-163/Knowles Rock <br /> 1714 Main St <br /> Escalon, CA 95320 <br /> Attention Justin Powers QC Sample Group 9809815-01 Reported Sep 28, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Matrix Liquid <br /> Method EPA 8015 <br /> Analyst N C <br /> ' ANALYTE Gasoline <br /> ' QC Batch# GC091598BTIX30A <br /> Sample No GW9809323-2 <br /> Date Prepared 9115198 <br /> Date Analyzed 9/15198 <br /> Instrument I D # GCHP30 <br /> Sample Conc , ug/L N D <br /> ' Conc Spiked ug/L 250 <br /> Matrix Spike, uglL 280 <br /> % Recovery 110 <br /> Matrix <br /> Spike Duplicate ug1L 300 <br /> % Recovery 122 <br /> ' Relative % Difference 10 <br /> ' RPD Control Limits 0 25 <br /> ICS Batch# GWLCS091598A <br /> Date Prepared 9115198 <br /> Date Analyzed 9/15/98 <br /> Instrument I D# GCHP30 <br /> Conc Spiked, ug/L 250 <br /> ' LCS Recovery, ug/L 300 <br /> LCS % Recovery 118 <br /> Percent Recovery Control Limits <br /> MSIMSD 60140 <br /> LCS 70 130 <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 /> eANALYTICA 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 /> om <br /> Project Manager <br />