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rfllCC <br /> i . <br /> Mr. Charles l.eubner• <br /> 10 October 1991 <br /> t Page 4 <br /> ualitative Field-Sc-re-ening <br /> preliminary indication of possible hydrocarbon contamination, a portable <br /> To provide a <br /> E 'g <br /> organic vapor analyztsr (OVA) was used to monitor Soils container t hydrocarbonvapors <br /> samples collected. Soils were monitored by filling a glassone third <br /> w� <br /> re <br /> ` � r capacity with soil and sealing the container with ascrew-top lid. The containers a <br /> n to promote volatilization of petroleum hydrocarbons that may be <br /> then placed in the Suy 15 minutes a hole <br /> present in the sampOVA frobeisrinseIrtedlin the hey pa e, and the concentration of <br /> the container, the p <br /> organic vspors present in the headspace is recorded in parts per million by volume. The <br /> tyz organic vapor analyzer used in this investigation was a Foxboro Model OVA 128,equipped <br /> t with a flame ionization detector, calibrated to a methane standard. <br /> cessment <br /> qual <br /> ative as- <br /> f ' <br /> The OVA is a field instrument which provides nre-sent in sample. The OVA cannot <br /> . of the torsi organic constituent concentrationp <br /> Identify or distinguish between individual volatile constituents such as methane or <br /> 1. ;3 gasoline, nor can they identify concentrations of individual constita;ents. <br /> noting any staining or <br /> Field screening also included visual observation of samples, <br /> +: changes in color or appearance which might suggest the presence or absence of petroleum <br /> hydrocarbons. The results of field screening for organic vapors and visual.indications of <br /> stoning are noted on the boring logs. <br /> 3 <br /> ANAL�fTI AL 12ESULTS <br /> � ills <br /> The analytical program for the soil samples collected from the Franklin Nigh School site <br /> consisted of the following analyses: <br /> Method <br /> GC-F1D with EPA 5030 (purge <br /> Tote] Petroleum Hydrocarbons - Gasoline and trap) sample preparation <br /> method <br /> Benzene, ethylbenzene, toluene, and <br /> EPA Method 8020 <br /> xylenes <br /> Inductively coupled argon plasma _ _ - <br /> Lead emission spectroscopy <br /> �� w <br />