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r <br /> 6) Sequoia `680 Chesapeake Drive Redwood City,CA 9406(415) 364.9600 FAX(415) 364-9233 <br /> 104 N.Wig,,lane Walnut Creek,CA 94598 (510) 988-9600 FAX(510)988.9673 <br /> Analytical 819 Striker Avenue,Suite 8 Sacramento,CA 95834 (916) 921-9600 FAX(916)921.0100 <br /> Terra Vac Cor <br /> P• Client Project ID. Chevron #9-4054 sampled':'' Sep 29-30, 97:;: <br /> 1651 Alvarado Street Sample Matrix: Water Received: Oct 1, 1997 <br /> San Leandro, CA 94577 Analysis Method: EPA 5030/8015 Mod./8,020 Reported: Oct 13, 1997 <br /> Attention Cliff Garratt First Sample #: 710-0034 <br /> QC Batch Number: GC100397 GC100397 GC100397 GC100397 GC100397 <br /> TOTAL PURGEABLE PETROLEUM HYDROCARBONS witheBTEX DISTINCTION <br /> Reporting Sample Sample Sample Sample Sample <br /> Analyte Limit I.D. I.D. I.D. I.D. I.D. <br /> Ng/L 710-0034 710-0035 710-0036 710-0037 710-0038 <br /> GP-1 GP-2 GP-3 GP-413 GP-6 <br /> Purgeable <br /> Hydrocarbons 50 24,000 40,000 56,000 16,000 14,000 <br /> Benzene 0.50 740 3,300 6,200 3,800 4,300 <br /> Toluene . 0.50 210 910 4,600 350 130 <br /> Ethyl Benzene 0.50 460 530 2,000 420 N.D. <br /> i <br /> Total Xylenes 0.50 380 4,400 5,700 290 N.D. <br /> Chromatogram Pattern. Gasoline Gasoline Gasoline Gasoline Gasoline <br /> I <br /> Duality Control Data <br /> Report Limit Multiplication Factor: 200 200 400 200 200 <br /> i <br /> Date Analyzed: 10/3/97 10/3/97 10/3/97 10/3/97 10/3/97 <br /> I <br /> Instrument Identification: HP-4 HP-4 HP-4 HP-4 HP-4 <br /> i <br /> Surrogate Recovery, %: 114 107 107 103 105 <br /> (OC Limits = 70-130%) <br /> Purgeable Hydrocarbons are quantitated against a fresh gasoline standard. <br /> Analytes reported as N.Q.were not detected above the stated reporting limit. <br /> I <br /> SEQUOIA ANALYTICAL, #1271 <br /> IKUIU• 0_ <br /> Melissa A. Brewer <br /> Client Services Representative <br /> 7100031.TVC <2> <br /> m <br />