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77* 3 PIM MEMEM - r�J Organic vapor monitoring is based upon the measurement of volatile organic3." compounds (VOC°e) in the soil pore apace an they vaporize into the soil - •�'�= atmosphere from a source. The source of the V0C's may be in soil or N ground water. Higher concentration of voc's at a particular subsurface location will tend to result in higher VOC concentration in the Boil—gas p� above that location. Since VOC's are the major components of most �( hydrocarbons and solvents, this technology can be utilized to assess the l� presence and lateral extent of subsurface hydroccrbon and solvent e) contamination. '` +` ;?e Reconnaissance organic vapor nonitaring was conducted at the Shell statim using. OVM's. The OVM's are adsorbent carbon sr:mslers which may be buried in the ground to assess the presence of organic vapors. Each OVM is sheltered in a tin manifold which has been steam cleaned to remove any volatile compounds, The OVM and manifold are placed in a shallow hole and covered with clean sand. The remaining hole is backfilled with soil cuttings and is covered with a plastic can anal a bentonite plaster to r�¢ protect the OVM from surface infiltration, P Twenty OVM's were installed at the Snell station on 2S September :987. a� The locations of the OVM'a are sham on ?late 2. Of the 20 OV—Is, 18 were .114 ri installed one and one—half feet below the ground surface and 2 others were installed three feet below the ground Surface. The OVM's buried three * ; 1. 2*k feet below the arrface were installed to assess.*, whether organic vapors, if '`W A detected, were Migratingw vertically .from a deeper source or laterally under the impermeable a4phalt or concrete. They were each installed three feet from a shallow (1.5 feet deep) OVM to provide gradient information. The 2 pairs Of shallow plus deep OVM's are called "depth profiles" and are shown on Plate 2. Additionally. 3 of the 20 M's were installed as fit a _ n �- 7o-87-979 3 • .. F' �AIt6. 4 vsv, r