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(` UO1a 680 Chesapeake Drive Redwood Clty CA 94063 (650)364-9600 FAX(650) 364 9233 <br /> J 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)921 9600 FAX(916)921 0100 <br /> E455 McDowell Blvd North Ste D Petaluma CA 94954 (707)792 1865 FAX(707) 792 0342 <br /> 1551 Industrial Road San Carlos, CA 94070 4111 (650) 232 9600 FAX (650) 232 9612 <br /> ATC Associates, Inc Client Project ID Van Dyken Property 14981 0001 <br /> 1117 Lane Palm Avenue Matrix Solid <br /> ' Modesto, CA 95351-1502 <br /> Attention Jeanne Homsey Work Order# 9902A41 -01-03 Reported Mar 8, 1999 <br /> ' QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes BTEXasTPH <br /> Benzene <br /> QC 13atch# SP0225998020EXA SP0225998020EXA SP0225998020EXA SP0225998020EXA SP0225998020EXA <br /> Analy Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 EPA 8015M <br /> Prep Method EPA 5030 EPA 5030 EPA 5030 EPA 503D EPA 5030 <br /> Analyst C Westwater C Westwater C Westwater C Westwater C Westwater <br /> MS/MSD # 9021900 9021900 9021900 9021900 9021900 <br /> Sample Conc N D N D N D N D N D <br /> Prepared Date 2/25/99 2/25/99 2/25/99 2/25/99 2/25/99 <br /> Analyzed Date 2/25/99 2/25/99 2/25/99 2/25/99 2/25/99 <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 15 6 mg/Kg <br /> Result 095 080 083 28 11 <br /> MS % Recovery 119 100 104 117 71 <br /> Dup Result 092 078 082 28 11 <br /> MSD % Recov 115 98 103 117 71 <br /> ' RPD 32 25 12 00 00 <br /> RPD Limit 0-20 0-20 0-20 0-20 050 <br /> LCS # LCS022599 LCS022599 LCS022599 LCS022599 LCS022599 <br /> ' Prepared Date 2/25/99 2/25/99 2/25/99 2/25/99 2/25/99 <br /> Analyzed Date 2/25/99 2/25/99 2/25/99 2/25/99 2/25/99 <br /> Inttrument 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 15 6 mg/Kg <br /> LCS Result 11 092 094 32 13 <br /> LCS % Recov 138 115 118 133 83 <br /> ' LCS 50-150 5n-15n 50-150 50-1500 50150 <br /> Control Limits <br /> ' Please Note <br /> SEQUOIA ANALYTICAL The LCS is a control sample of known,interferent free matrix that is anaiyzed using the same reagents <br /> Elap #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 analyticai 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 /> Kayva� Imy <br /> ' Project Manager *MS=Matrix Spike MSD=MS Duplicate RPD=Relative% Difference 9902A41 AAA <1> <br />