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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650)364-9600 FAX(650)364-9233 <br /> 404 N Wiget Lane Walnut Creek.GA 94598 (925)988-9600 FAX(915)988-9673 <br /> Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)921-9600 FAX(9t6)921-0t00 <br /> 1455 McDowell Blvd North Ste D Petaluma.CA 94954 (707)792-1865 FAX(707)792-0342 <br /> ATC Associates, Inc Client Project ID KOK Realty 62581 0001 <br /> 1260 Graphics Drive Matrix Solid <br /> Modesto, CA 95351-1502 <br /> Attention Jeanne Homsey Work Order# 9809733 -05, 07 Reported Sep 30, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> TTLC <br /> Analyte Beryllium Cadmium Chromium Nickel Mercury <br /> QC Batch# ME0915986010MDC ME091598601OMDC ME091598601OMDC ME091598601OMDC ME0916987471M4 <br /> Analy Method EPA 6010 EPA 6010 EPA 6010 EPA 6010 EPA 7471 <br /> Prep Method EPA 3050 EPA 3050 EPA 3050 EPA 3050 EPA 7471 <br /> Analyst C Caoile C Caoile C Caoile C Caoile 8 Entenmann <br /> MS/MSD# 980973305 980973305 980973305 980973305 980981801 <br /> Sample Conc N D NO 18 18 046 <br /> Prepared Date 9/15/98 9/15/98 9/15/98 9/15/98 9/16/98 <br /> Analyzed Date 9/16/98 9/16/98 9/16/98 9/16/98 9/16/98 <br /> Instrument I D # MTJA5 MTJA5 MTJA5 MTJA5 MPE4 <br /> Conc. Spiked 50 mg/Kg 50 mg/Kg 50 mg/Kg 50 mg/Kg 2 0 mg/Kg <br /> Result: 42 44 61 60 17 <br /> MS % Recovery- 84 88 86 84 85 <br /> Dup Result 41 43 61 60 17 <br /> MSD % Recov 82 86 86 84 85 <br /> RPD* 24 23 00 00 00 <br /> RPD Limit 0-20 0-20 0-20 0.20 0.20 <br /> LCS # LCS091598 LCS091598 LCS091598 LCS091598 LCS091698 <br /> Prepared Date 9/15/98 9/15/98 9/15/98 9/15/98 9/16/98 <br /> Analyzed Date. 9/16/98 9/16/98 9/16/98 9/16/98 9/16/98 <br /> Instrument 1.13 #' MTJA5 MTJA5 MTJA5 MTJA5 MPE4 <br /> Conc, Spiked: 50 mg/Kg 50 mg/Kg 50 mg/Kg 50 mg/Kg 2 0 mg/Kg <br /> LCS Result 5o 5o so 50 18 <br /> LCS %Recov 100 100 — 100 100 90 <br /> U <br /> 80-120 80120 80-120 80-120 75-125 <br /> LCS 80-120 80-120 80-120 80.120 75-125 <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 If <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 /> an Kim <br /> Project Mal lager *"MS=Matrix Spike, MSD=MS Duplicate,RPD=Relative%Difference 9809733 AAA <1> <br />