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i1 fN Illi <br /> Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650)364-9600 FAX(650) 364-9233 <br /> 404 N Wiget Lane Walnut Creek CA 94598 (915)988-9600 FAX(925)988 9673 <br /> Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)911-9600 FAX(916)921 0100 <br /> 1455 McDowell Blvd North Ste D Petaluma,CA 94954 (707)792-1865 FAX(707)791-0342 <br /> ATC Associates, Inc Client Project ID Farmer Property, #162596 0001 <br /> 1260 Graphics Drive <br /> Modesto, CA 95351-1502 <br /> Attention Drew Van Allen QC Sample Group 9806116-03, -07-08 Reported Jul 10, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Matnx Liquid <br /> Method EPA 8015 <br /> Analyst N HERRERA <br /> ANALYTE Gasoline <br /> QC Batch# GC070798BTEX02A <br /> Sample No GW9806G23-7 mt <br /> Date Prepared 717198 <br /> Date Analyzed 717198 <br /> Instrument I D# GCHP02 <br /> Sample Cone , ug/L N D <br /> Cone Spiked ug/L 250 <br /> Matrix Spike ug/L 220 <br /> % Recovery 90 <br /> Matrix <br /> Spike Duplicate, ug/L 230 <br /> % Recovery 92 <br /> Relative % Difference 2 2 <br /> RPD Control Limits 0-25 <br /> LCS Batch# GWBLK07079SABS <br /> Date Prepared 717198 <br /> Date Analyzed 717198 <br /> Instrument I D # GCHP02 <br /> Cone Spiked ug/L 250 <br /> LCS Recovery, ug1L 240 <br /> LCS % Recovery 95 <br /> Percent Recovery Control Limits <br /> MSIMSD 60140 <br /> LCS 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 /> K n Kimyai <br /> Project Manager <br />