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- . Sequoia 680 Chesapeake Drive Redwood City CA 94063 (4 15) 364 9600 FAX(415) 364 9233 404 N Wiget Lane Walnut Creek CA 94598 (510) 988 9600 FAX(510)988 9673 Analytical 319 Striker Avenue Suite 8 Sacramento CA 95834 ;916) 921 9600 FAX (916)921 0100 i Brown & Caldwell Client Project ID Arco 2133, Stockton 9616 Micron Ave Suite 600 Matrix Water Sacramento, CA 95827 Attention Mindy Patterson QC Sample Group 507-0342 Reported Jul 25, 1995 QUALITY CONTROL DATA REPORT ANALYTE Ethyl- Benzene Toluene Benzene Xylenes TRPH Method. EPA 8020 EPA 8020 EPA 8020 EPA 8020 EPA 418 1 Analyst: C Lee C Lee C Lee C Lee V Owens Concentration Spiked 10 ug/L 10 ug/L 10 ug/L 30 ug/L 4 0 mg/L LCS Batch#- LCS071495 LCS071495 LOS071495 LCS071495 LCS07209S Date Prepared 7/14/95 7/14/95 7/14/95 7/14/95 7/20/95 Date Analyzed: 7/14/95 7/14/95 7/14/95 7/14/95 7/20/95 Instrument I.D.#- GCHP-2 GCHP-2 GCHP-2 GCHP-2 IR-1 LCS % Recovery. 102 102 102 102 100 Control Limits: 75.125 75.125 75-125 75-125 80-120 MS/MSD Batch#: BS071495 BS07'1495 BS071495 SS071495 SS072095 Date Prepared: 7/14/95 7/14/95 7/14/95 7/14/95 7/20/95 Date Analyzed: 7/14/95 7/14/95 7/14/95 7/14/95 7/20/95 Instrument I.D.#: GCHP-2 GCHP-2 GCHP-2 GCHP-2 IR-1 Matrix Spike % Recovery: 104 105 105 104 100 Matrix Spike Duplicate% Recovery: 101 102 103 101 97 Relative% Difference: 29 29 19 29 30 EQUOIA ANALYTICAL Please Note The LCS is a control sample of known,interferent free matrix that 1s analyzed using the same reagents, / preparation and analytical methods employed for the samples The LCS%recovery data 1s used for validation of sample batch resuits Due to matrix effects,the QC limits for MS/MSD's are advisory only Janet Hanand are not used to accept or refect batch results Project Manager 507034ZBRS <4>