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TECH/AAT Fkport: 1/21/90 to PPATT CONSULTING COMPANY Parte e Calibrations were performed usln2 the Scott calibration gas, which contained methane butane,pentane,hw mng,and heptane at concentrations of approximately 15 d ethane, propane• Scott gas Is furnished with an exact analysis certified to t 2%.) Calibration runs©e pe omdry ed itrogt er intervals four times during the day. aIrragula ',Ucks of the pre-cleaned and other sample botV0s :vera performsd by heating randornly-chosen em t bottles in a water bath to more than 50 Cafslus and analyzing a sample of gas withdrawn from the bottle• p y Occasional check runs were performed with sanipfes of diesel, leaded gasoline and unleaded gasoline headspace vapor to ensure that instrumental response was adequate and appropriate. Additional check runs were made with samples of benzene, toluene, and m-xylene headspace vapor to confirm that retention time drift had not exceeded narrowly-defined allowed limits. A factory-calibrated flowmeter was u sto ensur I consistency of carrier gas rate-of-flow. Duplicate analyses were performed on 10%of the samples to protide ? another quality control check ) All uFIaAry control check results were satisfactory. I PROCEDURE i Samples were collected in the field using 40 mf glass Mals VOA,vials with Te1ion top septa). the vials f were heated in a water bath to at least 40 Celsius A sample of headspace has was injected into the Photova� I ; and the analysis performed. DuPlIcate analyses were performed to check car:sistency of the chromatograms. ` RESULTS ; fd^ l At Clean A2 Clean Clean Under regulstoryltmit of 100 ppm for A5 t#asolEne or diesel fuel Primarily diesel but some gasoline; AS estimated at several hundred ppm ; No contamination ftorfrom PR Very heavy contam,natfon;estimated at z 50o pprn Y Clean 82 Clean S4 Clean } Clean . 7fiolromatograms are attached as an appendix u. _ ..