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•( Sequoia 680 Chesapeake Drive Redwood CIM CA 94063 (415) 364 9600 FAX(415) 364-9233 <br /> 404 N Wiget Lane Walnut Creek,CA 94598 (510) 988-9600 FAX(510)988-9673 <br /> *Air Analytical 819 Sinker A--- Suite 8 Sacramento CA 95834 (916) 921-9600 FAX(916)921 0too <br /> own and Caldwell Client Project ID "Arc642093, Tracy " h <br /> 616 Micron Ave , Ste 600 Matra Liquid <br /> Sacramento, CA 95827 <br /> Attention Steve Misner QC Sample Group 7060709-715 Reported Jun 25, 1997 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte. Benzene Toluene Ethyl Xylenes <br /> Benzene <br /> QC Batch# GCO61397 GCO61397 GCO61397 GCO61397 <br /> 802002A 802002A 802002A 802002A <br /> Analy Method. EPA 8020 EPA 8020 EPA 8024 EPA 8020 <br /> Prep Method-, EPA 5030 EPA 5030 EPA 5030 EPA 5030 <br /> AnalystK Nill K Nill K Nil] K Nill <br /> MS/MSD# 7060564 7060564 7060564 7060564 <br /> Sample Conc. ND N D N D ND <br /> Prepared Date 6/13/97 6/13/97 6/13/97 6/13/97 <br /> Analyzed Date 6/13/97 6/13/97 6/13/97 6/13/97 <br /> Instrument I D.# HP-2 HP-2 HP-2 HP-2 <br /> Cone Spliced 20ug/L 20ug/L 20ug/L 60ug/L <br /> Result 15 20 19 60 <br /> MS % Recovery. 75 100 95 100 <br /> Dup Result. 15 20 19 59 <br /> SD % Recov 75 100 95 98 <br /> RPD. 00 00 00 17 <br /> RPD Limit 0.20 0-20 0.20 0.20 <br /> LCS #. 2LCS061697 2LCS061697 2LCS061697 2LCS061697 <br /> Prepared Date 6/16/97 6/16/97 6/16/97 6/16/97 <br /> Analyzed Date 6/16/97 6/16/97 6/16/97 6/16/97 <br /> Instrument I.D.#. HP-2 HP-2 HP-2 HP-2 <br /> Cone Spiked 20ug/L 20frg/L 20pg/L 60yg/L <br /> LCS Result- 15 20 19 58 <br /> LCS. % Recov 75 100 95 97 <br /> LCS. 70-130 70-130 70-130 70-130 <br /> Control Limits <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, #1271 preparation,and analytical methods employed for the samples The matrix spike is an aliquot of sample <br /> n fortified with known quantities of specific compounds and subjected to the enure analytical procedure H <br /> the recovery of analytes from the matrix spike does not fall within specified control limits due to matrix <br /> in erference,the LCS recovery is to be used to validate the batch <br /> Melissa A Brewer "*MS-Matrix Spike,MSD=MS Duplicate,RPD=Relative%Difference <br /> Client Services Representative <br /> 7060709 BRS <3> <br />