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Sequoia 680 Chesapeake Drive Redwood GM CA 94063 (650) 364 9600 FAX(650)364 9233 <br /> 404 N Wiget Lane Walnut Creek CA 94598 (510) 988 9600 FAX(510)9"9673 <br /> Analytical 819 Striker Avenue,Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> Pacific Environmental Group Client Project ID 920-119 1A/9-0171, Stockton <br /> 2025 Gateway Place, Suite 440 Matrix SOLID <br /> San Jose, CA 95110 <br /> Attention Tim Anensen Work Order# 9712E29 01-07 Reported Jan 12, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Total Recoverable Hexavalent <br /> Petroleum Hydrocarbo Chromium <br /> OC Batch#' IN122397552000A IN122397218600A <br /> Analy. Method SM 5520EF EPA 218 6 <br /> Prep. Method <br /> Analyst P Cheung T McMahon <br /> MS/MSD# 9712CB303 9712E2907 <br /> Sample Cone.: N D ND <br /> Prepared Date 12/23/97 12/23/97 <br /> Analyzed Date 12/23/97 12/23/97 <br /> Instrument I D # MANUAL MANUAL <br /> Cone Spiked. 150 mg/Kg 50 mg/Kg <br /> Result. 160 50 <br />. MS %Recovery 106 100 <br /> Dup Result 141 50 <br /> MSD %Recov : 96 100 <br /> RPD. 13 00 <br /> RPD Limit: 0-30 0.20 <br /> LCS#. LCS122397 LCS122397 <br /> Prepared Date: 12/23/97 12/23/97 <br /> Analyzed Date: 12/23/97 12/23/97 <br /> Instrument I.D.# MANUAL MANUAL <br /> Cone. Spiked. 150 mg/KS 5o mg/Kg <br /> LCS Result: 142 046 <br /> LCS% Recov.: 98 92 <br /> 60-140 75-125 <br /> LCS 70-130 80-120 <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 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 H <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 /> Tod Granlcher <br /> Project Manager **MS=Matrix Spike,MSD=MS Duplicate, RPD=Relative%Difference 9712E29 PPP e5, <br />