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•• <br /> Sa..V bWChesapeake Drive Redwood City%m0p494vA@W (650)364-9600 FAX(650)364-9233 <br /> Sequoia 404 N.Wiget Lane Walnut Creek,CA 94598 (925)988-9600 FAX(925)988-9673 <br /> 819 Striker Avenue,Suite 8 Sacramento,CA 95834 (916)921-9600 FAX(916)921-0100 <br /> 455 cDoweBlvd. Petuma,CA 4954 (707)792- 865 FAX(707)792-032 <br /> Analytical InMdustrialll North,Ste.D Road SanalCarlos,CA994070-4111 (650)Z32-96001FAX(650)232-96142 <br /> ' ATC Asso-ciates, inc. Oiient Project ID: Oaks-*625' 4-"ddb6 <br /> 1117 Lone Palm Ave., Ste. B Matrix: Solid <br /> Modesto, CA. 95351 <br /> Attention: J. Homsey QC Sample Group: 9050854-860 Reported: May 20, 199 <br /> ............................ ............. <br /> ........ . . . ............... <br /> 1.0 QUALITY CONTROL DATA REPORT <br /> Analyte: Benzene Toluene Ethyl xylenes Diesel <br /> 4.@ Benzene <br /> QC Batch#: SP051799 SP051799 SP051799 SP051799 SP051799 <br /> 8020EXA 8020EXA 8020EXA 8020EXA 8015EXA <br /> 11.0 Analy. Method: EPA 8020 EPA 8020 EPA 8020 EPA 8020 EPA 8015M <br /> Prep. Method: EPA 5030 EPA 5030 EPA 5030 EPA 5030 EPA 3550 <br /> Analyst: C,Westwater C.Westwater C.Westwater C.Westwater K.Grubb <br /> MS/MSD#: 9050854 9050854 9050854 9050854 9050858 <br /> 116.0 Sample Conc.: N.D. N.Q. N.D. N.D. N.D. <br /> Prepared Date: 5/17/99 5/17/99 5/17/99 5/17/99 5/17/99 <br /> Analyzed Date: 5/17/99 5/17/99 5/17/99 5/17/99 5/19/99 <br /> Instrument I.D.#.* HP-5 HP-5 HP-5 HP-5 HP-3B <br /> Conc. Spiked: 0.80 mg/Kg 0.80 mg/Kg 0.80 mg/Kg 2.4 mg/Kg 15 mg/kg <br /> Result: 0.75 0.77 0.78 2.4 13 <br /> MS % Recovery: 94 96 98 100 87 <br /> Dup. Result: 0.78 0.80 0181 2.5 12 <br /> MSD % Recov.: 98 100 101 104 80 <br /> ry <br /> RPD: 3.9 3.8 318 4.1 8.0 <br /> RPD Limit: 0-20 0-20 0-20 0-20 0-50 <br /> ................... ................ <br /> ............- <br /> .. ............ <br /> LCS #: 5LCS051799 5LCS051799 5LOS051799 5LCS051799 LCS051799 <br /> LW <br /> Prepared Date: 5/17/99 5/17/99 5/17/99 5/17/99 5/17/99 <br /> Analyzed Date: 5/17/99 5/17/99 5/17/99 5/17/99 5/19/99 <br /> Instrument I.D.#: HP-5 HP-5 HP-5 HP-5 HP-3A <br /> Conc. Spiked: 0.80 mg/Kg 0.80 mg/Kg 0.80 mg/K9 2.4 mg/Kg 15 mg/kg <br /> LCS Result: 0.92 0.93 0.95 2.8 16 <br /> 6P LCS % Recov.: 115 116 119 117 107 <br /> ms/mw <br /> LCS 50-150 50-150 50-150 50-150 60-140 <br /> Control Limits <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, #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 /> 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 /> Dimple Sharma MS=Matrix Spike,MSD=NIS Duplicate,RPD=Relative%Difference <br /> Project Manager <br /> 9050854.AAA <7> <br /> L.P <br />