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819 Stoker Avenue,Suite 8 <br /> Sequoia 916 `Z - <br /> (9161 9z 1.96go <br /> FAX(916)9z!-oloo <br /> Analytical -vw.sequoWahs.corn <br /> SECOR International-Rancho Cordova Project: ARCO 4493, Stockton,CA Sampled: 6119/00 <br /> 3017 Kilgore Road,Suite 100 Project Number: NIA Received: 6123100 <br /> Rancho Cordova,CA 95670 Project Manager-. Rusty Benkosky Reported. 716100 <br /> Volatile_Organic_Compounds_by_EPA_Method_826OA/Quality Control <br /> Sequoia Analytical-Sacramento <br /> Date Spike Sample QC Reporting Limit Recov. RPD RPD <br /> IAnalyte Analyzed Level Result Result Units Recov.Limits % Limit % Nates* <br /> LCS Dup(continued) 0060286-BSD1 <br /> Surrogate: Dibromofluoromethane 6129/00 50.0 48.8 ug/1 70.0-130 97.6 <br /> Surrogate: 1,2-DCA-d4 50.0 52.8 70.0-130 106 <br /> Surrogate: Toluene-d8 50.0 51.2 70.0-130 102 <br /> Surrogate: 4-BFB 50.0 48.0 70.0-130 96.0 <br /> Matrix Spike_ 0060286-MSI 5006320-05 <br /> Benzene 6129/00 50.0 2.06 52.2 ug/l 60.0-140 100 <br /> Chlorobenzene 50.0 ND 51.2 60.0-140 102 <br /> 1,1-Dichloroethene 50.0 ND 43.4 60.0-140 86.8 <br /> Toluene 50.0 ND 49.8 60.0-140 99.6 <br /> Trichloroethene 50.0 20.2 71.0 60.0-140 102 <br /> Surrogate: Dibromofluoromethane 50.0 49.8 70.0-130 99.6 <br /> Surrogate: 1,2-DCA-d4 50.0 53.8 70.0-130 108 <br /> Surrogate: Toluene-d8 50.0 51.6 70.0-130 103 <br /> Surrogate: 4-BFB 50.0 47.6 70.0-130 95.2 <br /> Atrix S Oke Du 0060286-MSDI 5006320-05 <br /> Benzene 6/29/00 50.0 2.06 54.0 ug/I 60.0-140 104 25.0 3.92 <br />�Chlorobenzene - - - - 50:0,TND .-.53.0._. -- - - -- --- 60.0°140-1-06 _ 25.0.3_85 <br /> 1,1-Dichloroethene 50.0 ND 45.4 60.0-140 90.8 25.0 4.50 <br /> Toluene 50.0 ND 52.0 60.0-140 104 25.0 4.32 <br /> Trichloroethene 50.0 20.2 73.4 60.0-140 106 25.0 3.85---- <br /> Surrogate: <br /> .85 __Surrogate: Dibromofluoromethane 50.0 52.6 70.0-130 105 <br /> Surrogate: 1,2-DCA-d4 50.0 56.4 70.0-130 113 <br /> Surrogate: Toluene-d8 50.0 54.8 " 70.0-130 110 <br /> Surrogate: 4-BFB 50.0 50.0 70.0-130 100 <br /> Sequoia Analytical-Sacramento *Refer to end of report for text of notes and definitions. <br /> Page 25 of 26 <br />