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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (415) 364 9600 FAX(415) 364 9233 <br /> 1900 Bates Avenue Suite L Concord CA 94520 (510) 686 9600 FAX(510) 686 9689 <br /> Analytical 619 Striker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916) 921 0100 <br /> pe Env Mngmt , Inc Client Project ID Federal Bldg (Stockton), Proj #24030 10 <br /> 20280 S Vermont Avenue Matrix Soil <br /> Torrance, CA 90502 <br /> Attention Larry Harlan QC Sample Group 4070069-75 Reported Jul 11, 1994 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- Organic <br /> Benzene Toluene Benzene Xylenes Diesel Lead <br /> EPA <br /> Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 8015 Mcd LUFT <br /> Analyst C Chapman C Chapman C Chapman C Chapman M C D Ballard <br /> Concentration <br /> Spiked 0 20 mg/L 0 20 mg/L 0 20 mg/L 0 60 mg/L 7 5 mg/kg 0 50 mg/kg <br /> LCS Batch# LCS070794 LCS070794 LCS070794 LCS070794 BLK070694 LCS070794 <br /> LCS <br /> Date Prepared 7/7/94 7/7/94 7/7/94 7/7/94 7/6/94 7/7/94 <br /> Date Analyzed 7/7/94 7/7/94 7/7/94 7/7/94 7/7/94 7/8/94 <br /> Instrument I D # HP-1 HP-1 HP-1 HP-1 HP-3B SH 1000 <br /> LCS % <br /> Recovery 105 100 105 102 107 100 <br /> Control Limits 75-125 75-125 75-125 75-125 60 130 90-110 <br /> MS/MSD <br /> Batch # 4070270 4070270 4070270 4070270 4070075 4070073 <br /> Date Prepared 7/7/94 7/7/94 7/7/94 7/7/94 7/6/94 7/7/94 <br /> Date Analyzed 7/7/94 7/7/94 7/7/94 7/7/94 7/7/94 7/8/94 <br /> Instrument I D ,# HF-1 HP-1 MP-1 WP-1 HF-36 SH 1000 <br /> Matrix Spike <br /> % Recovery 110 110 115 112 103 100 <br /> Matrix Spike <br /> Duplicate <br /> Recovery 100 100 110 105 115 98 <br /> Relative% <br /> Difference 9 5 9 5 44 64 11 2 0 <br /> SEQUOIA ANALYTICAL Please Note <br /> The LCS is a control sample of known,interferent free matrix that is analyzed using the same reagents, <br /> 77 ,C,` e � preparation and analytical methods employed for the samples The LCS%recovery data is used for <br /> l/t validation of sample batch results Due to matrix effects,the OC limits for MS/MSDs are advisory only <br /> Craig C L and are not used to accept or refect batch results <br /> Project Manager <br /> 4070068 CCC <6> <br /> Y <br />