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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650)364-9600 FAX(650) 364 9233 <br /> 404 N Wiget Lane Walnut Creek CA 94598 (925)988-9600 FAX(925)988-9673 <br /> Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)9Z1-9600 FAX(916)921 0100 <br /> 1455 McDowell Blvd North Ste D Petaluma,CA 94954 (707)79Z-1865 FAX(707)792 0342 <br /> ATC Associates, Inc Client Project ID Farmer Property, #62596 0001 <br /> 1260 Graphics Drive <br /> Modesto, CA 95351-1502 <br /> Attention Drew Van Allen QC Sample Group 9806116-01-02, -04-06, -09 Reported Jul 10, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Matrix Liquid <br /> Method EPA 8020 <br /> Analyst N HERRERA <br /> ANALYTE Benzene Toluene Ethylbenzene Xylenes <br /> QC Batch # GC070698BTEX21 A <br /> Sample No GVV9806G23-1 <br /> Date Prepared 716198 716198 716198 716198 <br /> Date Analyzed- 716198 716198 716198 716198 <br /> Instrument I D # GCHP21 GCHP21 GCHP21 GCHP21 <br /> Sample Conc ug1L N D N D N D N D <br /> Conc Spiked, ug1L 10 10 10 30 <br /> Matrix Spike, ug/L 10 9 9 10 29 <br /> % Recovery 103 99 102 97 <br /> Matrix <br /> Spike Duplicate, ug/L 11 10 10 31 <br /> % Recovery 107 103 105 103 <br /> Relative % Difference 3 8 4 0 2 9 6 0 <br /> RPD Control Limits 0-25 0-25 0-25 0-25 <br /> LCS Batch# GWBLK07069BASS <br /> Date Prepared 7/6198 7/6198 716198 716198 <br /> Date Analyzed 716198 716198 716198 716198 <br /> Instrument I D # GCHP21 GCHP21 GCHP21 GCHP21 <br /> Conc Spiked, ug/L 10 10 10 30 <br /> LCS Recovery, ug/L 11 10 10 31 <br /> LCS % Recovery 106 102 103 103 <br /> Percent Recovery Control Limits <br /> MSIMSD 60140 60140 60140 60-140 <br /> 7 LCS 70130 70130 70 130 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 /> t 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 limas due to matrix <br /> interference the LCS recover is to be used to validate the batch <br /> ray <br /> 7- Kimy <br /> Project Manager <br />