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Sequoia 819 Striker Avenue,Suite 8 <br /> Sacramento,CA 95834 a_ � <br /> Analytical (916)921-9600 <br /> FAX(916)921-0140 <br /> a ww.sequoialabs.com <br /> Delta Environmental COnsultants(Cameron Park) Project: ARCO 5469,Stockton,CA <br /> 3330 Cameron Park Dr.Ste 550 Project Number: N/A <br /> Reported: <br /> Cameron Park CA,45682 Project Manager; Jay Johnson <br /> 07/16/0I 15:54 <br /> Total Purgeable Hydrocarbons (C6-C12)and BTEX by DHS LUFT- Quality Control <br /> Sequoia Analytical -Sacramento <br /> Reporting Spike Source %REC RPD <br /> Analyte ResultLimit Units Leve[ <br /> Result %AEC Limits RPD Limit Notes <br /> Batch 107011$-EPA 520H(PIT <br /> Blank(1070118-BLK1) Prepared&Ana] zed:07/12/01 <br /> Purgeable Hydrocarbons NTD 50 ug/l <br /> Benzene ND 0.50 " <br /> Toluene ND 0.50 " <br /> Ethylbenzene ND 0.50 „ <br /> Xylenes(total) ND 0.50 " <br /> Surrogate;a,a,a-Trifluorotoluene 11.0 10.0 110 60-140 <br /> LCS(1070118-B51) Pre ared&Analyzed:07/12/01 <br /> Benzene 9.05 0.50 u <br /> 9A 10.0 90.5 70-230 <br /> Toluene 10.1 0.50 10.0 101 70-130 <br /> Ethylbenzene 10.5 0.50 10.0 105 70-130 <br /> • Xylenes(total) 29.7 0.50 30.0 99.0 70-130 <br /> Surrogate:a,a,a-TriI luorotoluene 11.1 " 10.0 111 66-140 <br /> Matrix S ike 1070118-MSI Source:5107019-02 Prepared&Anal zed:07/12/D1 <br /> Benzene 9.82 0.50 ug/l 10.0 0-73 90.9 60-140 <br /> Toluene 9.50 0.50 10.0 0.62 88.8 60.240 <br /> Ethylbenzene 9.20 0.50 10.0 ND 92.0 60-140 <br /> Xylenes(total) „ <br /> 25.6 0.50 30.0 0-67 83.1 60-140 <br /> Surrogate:a,a,a-Tri,Jluorotoluene 11.0 <br /> 10.0 <br /> 120 60-140 <br /> Matrix Spike bu 1070118-MSD1 Source: S107019-02 Pre ared&Analyzed:07/I2/01 <br /> Benzene <br /> 10.7 0.50 ug/l 10.0 0.73 99.7 60-140 8.58 25 <br /> Toluene 10.7 0.50 10.0 0.62 101 60-140 11.9 25 <br /> Ethylbenzene 10.4 0.50 10.0 ND 104 60-140 12.2 25 <br /> Xylenes(total) 30.0 0.50 30.0 0.67 97.8 60-140 15.8 25 <br /> Surrogate:a,a,a-Trifuorotoluene 12,4 10.0 114 60-140 <br /> •Sequoia Analytical- Sacramento The results in this pP a report IY to the samples analyzed in accordance with the chain <br /> P <br /> of custody document. This analytical report must be reproduced in its entirety. <br /> Page Page 5 of 7 <br />