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680 Chesapeake Drive Redwood City CA 94063 (650)364-9600 FAX(650)364-9233 <br /> Sequoia 404 N target Lane Walnut Creek CA 94598 (9Z5)988-9600 FAX(925)988-9673 <br /> 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)921-9600 FAX(916)92I-0100 <br /> Analytical 1455 McDowell Blvd North Ste D Petaluma,CA 94954 (707)792-1865 FAX(707)792-034Z <br /> TelCom Semiconductor, Inc Client Project ID Storm Drains <br /> 1300 Terra Bella Avenue <br /> Mountain View, CA 94039 <br /> ' Attention Cathleen Orr QC Sample Group 9812208 Reported Dec 18, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> ' Matrix Liquid <br /> Method EPA 8020 <br /> ' Analyst MM <br /> ANALYTE Benzene Toluene Ethylbenzene Xylenes <br /> QC Batch# GC12099811TEX03A <br /> ' Sample No GW9812055-2 <br /> Date Prepared 1219/98 1219198 1219198 1219198 <br /> ' Date Analyzed 1219/98 12/9198 1219198 1219198 <br /> Instrument I D # GCHP03 GCHP03 GCHP03 GCHP03 <br /> Sample Conc , ug/L N D N D N D N D <br /> Conc Spiked uglL 10 10 10 30 <br /> Matrix Spike ug]L 7 9 8 4 8 6 27 <br /> % Recovery 79 84 86 90 <br /> Matrix <br /> Spike Duplicate, uglL 8 7 8 9 9 3 28 <br /> % Recovery 87 89 93 93 <br /> ' Relative % Difference 9 6 5 8 7 8 3 3 <br /> ' RPD Control Limits 025 0-25 0-25 0-25 <br /> LCS Batch# GC120998BTEX03A <br /> Date Prepared 1219198 1219198 1219/98 1219198 <br /> Cate Analyzed 1219198 12/9!98 12!9198 1219198 <br /> ' Instrument 1 D 0 13CHP03 GCHP03 GCHP03 GCHP03 <br /> Conc Spiked, ug/L 10 10 10 30 <br /> LCS Recovery ug1L 8 7 9 0 9 3 28 <br /> LCS % Recovery 87 90 93 93 <br /> Percent Recovery Control Limits <br /> MSIMSD 60140 60140 60140 60140 <br /> LLS 70130 70130 70130 70130 <br /> Quality Assurance Statement All standard operating procedures and quality control requirements have been met <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 If <br /> 9,vim''v/_fir/,f n"v 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 /> em"'alra Grislis <br /> Project Manager <br />