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' 680 Chesapeake Drive Redwood City CA 94063 (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 /> Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)921-9600 FAX(916)921-0100 <br /> 1455 McDowell Blvd North Ste D Petaluma CA 94954 (707)792-1865 FAX(707)792-0342 <br /> I <br /> • <br /> I ' Ground Zero Analysis, Inc Client Project ID Knowles Rock <br /> 1714 Main St <br /> Escalon, CA 95320 <br /> ' Attention Greg Stahl QC Sample Group 9812E05-01,02 Reported Jan 10 1999 <br /> QUALITY CONTROL DATA REPORT <br /> Matrix Liquid <br /> Method EPA 8020 <br /> ' Analyst N H <br /> ANALYTE Benzene Toluene Ethylbenzene Xylenes <br /> ' QC Batch# GC122398BTEX02A <br /> Sample No 9812A02-9 <br /> Date Prepared 12/23/98 12/23/98 12/23/98 12/23/98 <br /> ' Date Analyzed 12/23/98 12/23198 12/23/98 12/23/98 <br /> Instrument I D # GCHP02 GCHP02 GCHP02 GCHP02 <br /> Sample Conc ug1L N D N D N D N D <br /> ' Conc Spiked, uglL 10 10 10 30 <br /> Matrix Spike uglL 9 2 9 2 9 5 28 <br /> % Recovery 92 92 95 93 <br /> Matrix <br /> Spike Duplicate, uglL 9 2 9 3 9 3 28 <br /> % Recovery 92 93 93 93 <br /> ' Relative % Difference 0 0 1 1 2 1 0 0 <br /> ' RPU Control Limits 0-25 0-25 0-25 0-25 <br /> ' LCS Batch# GC122398BTEX02A <br /> Date Prepared 12/23/98 12/23/98 12123/98 12/23/98 <br /> Date Analyzed 12/23/98 12/23/98 12123rH 12/23/98 <br /> ' Instrument I D # GCHP02 GCHP02 GCHP02 GCHP02 <br /> Conc Spiked, uglL 10 10 10 30 <br /> ' LCS Recovery, ug/L. 9 2 9 2 9 2 28 <br /> LCS % Recovery 92 92 92 93 <br /> Percent Recovery Control Limits <br /> ' MS/MSD 60140 60140 60140 60140 <br /> LCS 70130 70130 70130 70130 <br /> Quality Assurance Statement All standard operating procedures and quality control requirements have been met <br /> t 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 /> VV�'v� fortified with known quantities of specific compounds and subjected to the entire analytical procedure If <br /> WZthe 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 /> Mara Gnslis <br /> Project Manager <br /> 1 I <br /> I <br />