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Sequoia680 Chesapeake Dave Redwood City CA 94063 (415) 364 9600 FAX(415) 364 9233 <br /> 404 N %get Lane Walnut Creek CA 94598 (510) 988 9600 FAX(510)988 9673 <br /> Analytical 819 Sinker Avenue,Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> �, F <br /> uchstone Developments Client Project ID Chevron #9-4183 <br /> 81 Kingston Ave Matrix Solid <br /> Oakland, CA 94611 <br /> Attention Robert Mallory QC Sample Group 6041871-874 Reported Apr 30, 1996 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte 1 1 Dichloreethene Trichloroethene Benzene Toluene Chloro- <br /> benzene <br /> QC Batch# SP042996 SP042996 SP042996 SP042996 SP042996 <br /> 8240EXA 8240EXA 8240EXA 8240EXA 8240EXA <br /> Analy Method EPA 8240 EPA 8240 EPA 8240 EPA 8240 EPA 8240 <br /> Prep Method EPA 5030 EPA 5030 EPA 5030 EPA 5030 EPA 5030 <br /> Analyst S Le S Le S Le S Le S Le <br /> MS/MSD # 6041871 6041871 6041871 6041871 6041871 <br /> Sample Conc N D N D N D N D N D <br /> Prepared Date 4/29/96 4/29/96 4/29/96 4/29/96 4/29/96 <br /> Analyzed Date 4/29/96 4/29/96 4/29/96 4/29/96 4/29/96 <br /> Instrument I D # GC/MS 2 GC/MS-2 GC/MS-2 GC/MS-2 GC/MS-2 <br /> Conc Spiked 2500pg/kg 2500 pg/kg 2500 Vg/kg 2500 pg/kg 2500 fug/kg <br /> Result 2100 2600 2600 2300 2200 <br /> MS % Recovery 84 104 104 92 90 <br /> Dup Result 2100 2600 2600 2300 2200 <br /> orSID <br /> % Recov 83 104 103 92 89 <br /> RPD 096 039 078 087 045 <br /> RPD Limit 022 0-24 0-21 0-21 0-21 <br /> LCS # LCSO42996 LCSO42996 LCSO42996 LCSO42996 LCSO42996 <br /> Prepared Date 4/29/96 4/29/96 4/29/96 4/29/96 4/29/96 <br /> Analyzed Date 4/29/96 4/29/96 4/29/96 4/29/96 4/29/96 <br /> Instrument I D # GC/MS-2 GC/MS-2 GC/MS-2 GC/MS-2 GC/MS-2 <br /> Conc Spiked 50 jig/L 50 jig/L 50 pg/L 50}+g/L 50 fig/L <br /> LCS Result 44 46 45 45 46 <br /> LCS % Recov 89 92 90 90 92 <br /> LCS DL-234 71-157 37-151 47-150 37-160 <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 /> tC Ayy� l�� 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 /> #even Van Slambrook w*MS=Matrix Spike, MSD=MS Duplicate,RFD=Relative%Difference <br /> Project Manager <br /> 6041871 T UD a 22� <br />