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{ <br /> Sequoia 680 Chesapeake Drive Redwood City CA 94063 (4i5) 364.9600 FAX(415) 364-9233 <br /> 1 404 N,Wigct Lane Walnut Creek,CA 94598 (510) 988-9600 FAX(510)988-9673 <br /> i Analytical - 919 Striker Avenue,Suite 8 Sacramento,Ca 95834 (916) 921-9600 FAX(916)921-OIN x <br /> f <br /> I <br /> Brown and Caldwell (Sacramento) Client Project ID . Arco#2093,� racy <br /> :,'9616 Micron Ave., Ste. 600 Matrix: Liquid <br /> Sacramento, CA 95827 <br /> - ...... <br /> .."Attention, Steve Misner QC Sample Group: 7031527-537 Reported Mar 28 1997': <br /> ..... <br /> QUALITY CONTROL DATA REPORT ` <br /> u f <br /> Analyte: Benzene Toluene Ethyl Xylenes <br /> Benzene I° <br /> QC Batch#: GC032597 GC032597 GC032597 GCO32597 <br /> 802002A 802002A 802002A 802002A <br /> Analy. Method: EPA 8020 EPA 8020 EPA 8020 EPA 8020 i <br /> Prep. Method: EPA 5030 EPA 5030 EPA 5030 I! EPA 5030 s <br /> Analyst: K. Nill K.Nill K.Nill K.Nill <br /> ' MS/MSD #: 7031418 7031418 7031418 7031418 <br /> Sample Conc: N.D. N.D. N.D. N.D. <br /> Prepared Date: 3/25/97 3/25/97 3/25/97 3/25/97 <br /> Analyzed Date: 3/25/97 3/25/97 3/25/97 3/25/97 <br /> Instrument I.D.#: HP-2 HP-2 HP-2 HP-2 <br /> Conc. Spiked: 20yg/L 20,ug/L 20pg/L 60pg/L <br /> Result: 20 23 21 64 <br /> ( <br /> MS % Recovery: 100 115 105 107 ! <br /> Dup. Result: 18 21 18 i 58 <br /> MSD % Recov.: 90 105 90 97 <br /> H <br /> RPD: 11 9.1 15 9.8 <br /> RPD Limit: 0-25 0-25 0-25 ? 0-25 <br /> ........ .. .... ........................... <br /> LCS #: 2LCS032597 2LCS032597 2LCS032597 C21-CS032597 <br /> Prepared Date: 3/25/97 3/25/97 3/25/97 3/25/97 <br /> Analyzed Date: 3/25/97 3/25/97 3/25/97 3/25/97 <br /> Instrument I.D.#: HP-2 HP-2 HP-2 HP-2 <br /> Conc. Spiked: 20ug/L 20yg/L 20ug/L 60ug/L <br /> LCS Result: 15 18 17 50 ' <br /> LCS % Recov.: 75 90 85 83 <br /> ' 1 <br /> LCS 70-130 70-130 70-130 704130 <br /> Control Limits <br /> Quality Assurance Statement: All standard operating procedures and}quality control requirements have been met. <br /> Please Note: j <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 /> i <br /> fortified with known quantities of specific compounds and subjected to the entire analytical procedure. It <br /> Q f& l the recovery of analytes from the matrix spike does not fall within specified control limits due to matrix 1 <br /> interference,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 /> 7031527.BRS <5> <br /> 1 <br />