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SEQUOIA ANALYTICAL <br /> 680 Chesapeake Drive Redwood City, CA 94063 <br /> (415) 364-9600 FAX(415) 364-9233 <br /> .. . ........:.:.:::.......::: :.:..:.:.:..::...:.:....::.::::.::;: <br /> RESNA Client Project ID: 150D53.02,Stone Bros. <br /> 1710 Main Street Matrix: Soil <br /> »Escalon, CA 95320 <br /> .;>..Attention: Greg Stahl OC Sample Group: 4A36606 Reported: Jan 12 1994;.'- <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Beryflium Cadmium Chromium Nickel Mercury <br /> Method: EPA 6010 EPA 6010 EPA 6010 EPA,6010 EPA 7471 <br /> Analyst: C.Medefesser C.Medefesser C.Medefesser C.Medefesser M.Shkidt <br /> MS/MSO <br /> Batch#: 4A25601 4A25601 4A25601 4A25601 4A36606 <br /> Date Prepared: 1/10/94 1/10/94 1/10/94 1/10/94 1/10/94 <br /> Date Analyzed: 1/10/94 1/10/94 1/10/94 1/10/94 1/11/94 <br /> Instrument 1.134: MTJA�2 MTJA-2 MTJA-2 MTJA-2 MPE-2 <br /> Conc. Spiked: 100 mg/kg 100 mg/kg 100 mg/kg 100 mg/kg 1.0 mg/kg <br /> Matrix Spike <br /> %Recovery: 94 93 93 93 128 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery: 96 95 95 94 126 <br /> Relative% <br /> Difference: 2.1 2.1 2.1 1.1 1.6 <br /> LCS Batch#: BLK011094 BLK011094 BLK011094 BLK011094 CCV011094 <br /> Date Prepared: 1/10/94 1/10/94 1/10/94 1/10/94 1/10/94 <br /> Date Analyzed: 1/10/94 1/10/94 1/10/94 1/10/94 1/11/94 <br /> Instrument I.D.#: MTJA 2 MTJA 2 MTJA 2 MTJA-2 MPE-2 <br /> LCS% <br /> Recovery: 95 94 97 96 81 <br /> %Recovery <br /> Control Limits: 75-125 75-125 75-125 75-125 75-125 <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 /> �Tiknownfortified with quantities of specific compounds and subjected to the entire analytical procedure. H <br /> the recovery of analytes from the matrix spike does not fait within specified control limits due to matrix <br /> interference,the LCS recovery is to be used to validate the batch. <br /> Vickie <br /> Project Manager 4A36601.WAT <4> <br />