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t- Rf[MlCX�IIRNIR Mr. Charles Leubner 10 October 1991 Page 4 Qualitative Field Screening To provide a preliminary indication of possible hydrocarbon contamination, a portable organic vapor analyzer (OVA) was used to monitor soils for hydrocarbon vapors on all samples collected. Soils were monitored by filling a glass container to about one third capacity with soil and sealing the container with a screw-top lid. The containers are then placed in the sun to promote volatilization of petroleum hydrocarbons that may be present in the sample. After approximately 15 minutes a hole is punched in the top of the container, the OVA probe is inserted in the headspace, and the concentration of organic vapors present in the headspace is recorded in parts per million by volume. The organic vapor analyzer used in this investigation was a Foxboro Model OVA 128, equipped with a flame ionization detector, calibrated to a methane standard. The OVA is a field instrument which provides only a preliminary, qualitative assessment of the total organic constituent concentration present in the sample. The OVA cannot identify or distinguish between individual volatile constituents such as methane or gasoline, nor can they identify concentrations of individual constituents. . Field screening also included visual observation of samples, noting any staining or changes in color or appearance which might suggest the presence or absence of petroleum hydrocarbons. The results of field screening for organic vapors and visual indications of staining are noted on the boring logs. ANALYTICAL RESULTS Soil Analyses The analytical program for the soil samples collected from the Franklin High School site consisted of the following analyses: Analysis Method Total Petroleum Hydrocarbons - Gasoline GC-FID with EPA 5030 (purge and trap) sample preparation method Benzene, ethylbenzene, toluene, and EPA Method 8020 xylenes Lead Inductively coupled argon plasma emission spectroscopy