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Central " <br />Air, Water, & Hazardous Waste <br />Coast <br />Sampling, Analysis, & Consultation <br />Analytical <br />State Certified Hazardous Waste, <br />Services <br />Chemistry, & Bacteriology Laboratory <br />AMBIENT AIR ANALYSIS <br />141 Suburban Road, Suite C-4 6483—D Calle Real <br />San Luis Obispo, Ca 93401 Goleta, CA 93117 <br />(805) 543-2553 Fax (805) 543-2685 (805) 964-7838 <br />April 23, 1987 <br />NOTE: Grab samples collected in sequence. Actual time difference <br />about 5 minutes. Greatest contributor to differences in results <br />is the difference in time. <br />u <br />QUALITY ASSURANCE PROOF <br />Duplicate Samples <br />AMBIENT AIR ANALYSIS <br />(Results in ppbv) <br />Dichlorodifluoromethane <br />2.2 <br />2.0 <br />Methyl Chloride <br />2.8 <br />3.9 <br />191 -DCA <br />2.8 <br />6.4 <br />1,1,1 -Trichloroethane <br />12. <br />13. <br />Ethylene Dichloride <br />0.2 <br />0.2 <br />Carbon Tetrachloride <br />0.5 <br />0.5 <br />Benzene <br />1.4 <br />1.4 <br />Trichloroethylene <br />1.7 <br />2.0 <br />Tetrachloroethylene <br />1.2 <br />2.7 <br />Ethylbenzene <br />0.7 <br />0.9 <br />Xylenes <br />4.4 <br />5.5 <br />Carbonyl Sulfide <br />6.0 <br />6.0 <br />Butane <br />0.4 <br />0.8 <br />Carbon Disulfide <br />6.7 <br />3.6 <br />NOTE: Grab samples collected in sequence. Actual time difference <br />about 5 minutes. Greatest contributor to differences in results <br />is the difference in time. <br />u <br />