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0 SEQUOIA ANALYTICAL <br /> 1900 Bates Avenue s Suite LM • Concord, California 94520 <br /> 151x11 FRF-Qrn0 • FAX (RiN FRF-QFAQ <br /> aprealian Engineering, Inc Client Project ID Former Unocal Bulk Plant#0950,Stockton Sampled Feb 27, 1993 <br /> 2401 Stanwell Dr, Ste 400 Sample Matrix Water Received Mar 1, 1993 <br /> Concord, CA 94520 Analysis Method EPA 5030/8015/8020 Reported Mar 11, 1993 <br /> Attention Mardo Kaprealian, P E First Sample# 303-0009 <br /> TOTAL PURGEABLE PETROLEUM HYDROCARBONS with BTEX DISTINCTION <br /> Reporting Sample Sample Sample Sample Sample Sample <br /> Analyte Limit ID ID ID ID ID ID <br /> ug/L 303-0009 303-0010 303-0011 303-0012 303-0013 303-0014 <br /> MW MW MW MW4 MW5 MW6 <br /> Purgeable <br /> Hydrocarbons 50 N D N D 250 N D 14,000 N D <br /> i <br /> Benzene 0 5 N D N D 18 N D 5,300 N D <br /> Toluene 0 5 N D N D 0 93 N D 420 N D <br /> Ethyl Benzene 0 5 N D N D 25 N D 1,900 N D <br /> Total Xylenes 0 5 N D N D 18 N D 2,600 N D <br /> Chromatogram Pattern -- Gasoline Gasoiine <br /> Quality Control Data <br /> Report Limit Multiplication Factor 1 0 1 0 1 0 1 0 20 10 <br /> Date Analyzed 3/1/93 3/11/93 3/1/93 3/1/93 3/1/93 3/1/93 <br /> Instrument Identification HP-2 HP-2 HP-2 HP-2 HP-2 HP-2 <br /> Surrogate Recovery, % 98 105 103 100 114 100 <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 /> SPEOU IA ANALYTICAL <br /> Scott A hie o <br /> Project Manager 3030009 KEI <1> <br />