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SEQUOIA ANALYTICAL <br /> 819 Striker Avenue Suite 8 • Sacramento CA 95834 <br /> (916) 921-9600 • FAX (916) 921 0100 <br /> Aegis environmental Consultants Client Project 10 Shell, 141 N El Dorado, Stockton <br /> 1050 Melody Lane, Ste 160 Matrix Water <br /> Roseville, CA 95678 <br /> Attention Paul Graff QC Sample GrOUD 3110198-200 Reported Nov 13 1993 <br /> QUALITY CONTROL DATA REPORT <br /> ANAl.1fTE chromium Nickel Silver 7-inc TotaJ Conductance <br /> Dissolved <br /> Solids <br /> ! Method =PA 200 7 EPA 200 7 E=A 200 7 EPA 200 7 EPA 160 1 EPA 120 1 <br /> Analyst S Foster S Foster _ Faster S Foster Y Aneaga Y Arteaga <br /> MS/MSD <br /> Batch# 2110494 110494 - S-s94 3110494 9311556-01 9311650-01 ) <br /> Date Preparea '1/16/93 1!16193 5 93 11/16/93 1/15/93 11/11/93 <br /> Date Analyzed 11/17,93 11/17193 - 93 11/17/93 11/15/93 11/11/93 <br /> Instrument I D # PE-40 YE-40 PE40 N/A N/A <br /> Conc Spiked 0 10 mg/i- 0 10 ma/u _ —0 L 0 10 mg/L 250 mg/L 710 umhos/cm <br /> Matnx Spike <br /> °G Recovery a .s 37 00 99 <br /> Matn x Spike <br /> DuDiix ate Q% J <br /> Recovery 39 87 100 97 <br /> Relative % <br /> Difference - J 0 00 13 <br /> LCS Batch# <br /> Date Preparea <br /> Date Anaiyzea <br /> Instrument I D # <br /> LCS °; <br /> Recovery <br /> 16 Recovery <br /> Control Umrts 80.120 a0-120 _0-120 80-120 80-120 80-120 1 <br /> Please Note <br /> The LGS is a contici sample of known,interferent tree matrix that is analyzed using the same reagents, <br /> SECUOIA ANALYTICAL preparation and analytical methods employed for the samples The matrix spike to an aliquot of sample <br /> fortified with known cuantities of scectfic compounds and sub}ected to the entire analytical procedure if <br /> w <br /> the recovery at analytes tram the matrix spike aces not fail within specified control limits dui to matrix <br /> 0 ' - f 4 interference the LCS recovery is to be used to validate the batch <br /> Linda C Schneider <br /> Project Manager 3110198.AEG <12> <br />