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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 Creels,CA 94598 (925)988-9600 FAX(925)988-9673 <br /> frill' 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)791-0342 <br /> 1551 Industrial Road San Carlos, CA 94070-4111 (650) 232 9600 FAX (650)232 9612 <br /> t <br /> ATC Associates, Inc Client Project ID Ripon Unlfted School <br />' 1117 Lane Palm Avenue Matrix Solid <br /> Modesto, CA 95351-1502 <br /> Attention Drew Van Allen Work Order# 9901 E94 -01-08 Reported Feb 16, 1999 <br />' QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes BTEXasTPH <br /> Benzene <br /> QC Batch# SP0205998020EXA SP0205998020EXA SP0205998020EXA SP0205998020EXA SP0205998020EXA <br /> Analy Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 EPA 8015M <br /> Prep Method EPA 5030 EPA 5030 EPA 5030 EPA 5030 EPA 5030 <br /> Analyst C Westwater C Westwater C Westwater C Westwater C Westwater <br />' MS/MSD # 9020076 9020076 9020076 9020076 9020076 <br /> Sample Conc N D N D N D N D N D <br /> Prepared Date 2/5/99 2/5/99 2/5/99 2/5/99 2/5/99 <br /> Analyzed Date 2/5/99 2/5/99 2/5/99 2/5/99 2/5/99 <br /> Instrument I D # HP4 HP4 HP4 HP4 HP4 <br /> Conc Spiked 0 80 mg/Kg 0 80 mg/Kg 0 80 mg/Kg 2 4 mg/Kg 13 6 mg/Kg <br /> Result 1184 0 74 077 26 12 <br /> WS % Recovery 105 93 96 108 88 <br /> Dup Result 090 079 081 27 98 <br />' MSD % Recov 113 99 101 113 72 <br /> RPD 69 65 51 38 202 <br /> RPD Limit 0-20 0-20 0-20 0-20 0-50 <br />' LCS # LCS020599 LCS020599 LCS020599 LCS020599 LCS020599 <br /> Prepared Date 2/5/99 2/5/99 2/5/99 2/5/99 2/5/99 <br /> Analyzed Date 2/5/99 2/5/99 2/5/99 2/5/99 2/5/99 <br />' Instrument I D # HP4 HP4 HP4 HP4 HP4 <br /> Conc Spiked 0 80 mg/Kg 0 80 mg/Kg 0 80 mg/Kg 2 4 mg/Kg 13 6 mg/Kg <br /> LCS. Result 077 066 069 23 11 <br />' LCS % Recov 96 83 86 96 81 <br /> LCS 50-150 50-150 50-150 50-150 50-150 <br /> Control Limits <br /> tPlease Note <br /> EQUOIA ANALYTICAL The LCS is a control sample of known,interferent-free matrix that is analyzed using the same reagents <br /> lap #1271 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 /> r 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 /> Ka im <br /> Project Manager *"MS=Matrix Spike, MSD=MS Duplicate, RPD=Relative% Difference 9901E94AAA L 1> <br />