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4 SEQUOIA ANALYTICAL <br /> 680 Chesapeake Drive • Redwood City, CA 94063 <br /> (415) 364-9600 • FAX (415) 364-9233 <br /> Chevron U S A Inc Client Project ID P 0 9550390,56G8 N Pershing,Stockton Sampled Apr 26, 1993 <br /> P O Box 5004 Sample Matrix Soil Received Apr 26, 1993 <br /> San Ramon, CA 94583-0804 Analysis Method EPA 5030/8015/8020 Reported Apr 30, 1993 <br /> Attention Brett Hunter First Sample# 304-1035 <br /> TOTAL PURGEABLE PETROLEUM HYDROCARBONS with BTEX DISTINCTION <br /> Reporting Sample Sample Sample Sample Sample Sample <br /> Analyte Limit I D I D. 1.101 I D I D. I D. <br /> mg/kg 304-1035 304-1036 304-1037 304-1038 304-1039 304-1040 <br /> SP-12(A-B) SP-13(A-B) TB-3 TB-4 TX-1 PX-1 <br /> Purgeable <br /> Hydrocarbons 1 0 140 49 3,600 N D 1,400 N D <br /> Benzene 00050 N D N D N D N D N D N D <br /> Toluene 00050 0 66 036 17 N D 21 N D <br /> Ethyl Benzene 00050 1 2 032 23 N D 71 N D <br /> Total Xylenes 00050 10 34 140 N D 41 N D <br /> Chromatogram Pattern Gas Gas Gas Gas -- <br /> Quality Control Data <br /> Report Limit Multiplication Factor 10 10 20 1 0 10 10 <br /> Date Analyzed 4/26/93 4/26/93 4/26/93 4/26/93 4/26/93 4/26/93 <br /> Instrument Identification ML-2 ML-2 ML-2 ML-2 ML-2 ML-2 <br /> Surrogate Recovery, % 106 107 125 101 124 102 <br /> (OC Limits = 70-130%) <br /> Purgeable Hydrocarbons are quantitated against a fresh gasoline standard <br /> Analytes reported as N D were not detected above the stated reporting limit <br /> 101SEQUOIAANALYTICAL <br /> �— <br /> Nokowhat D Herrera <br /> Project Manager 304-1030 CHV <2> <br />