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Margrave Property Report-Soil Boring Installation Project No. 148.2 January 7,1994 Page 3 i reduction of iron or discoloration from hydrocarbons and other pollutants, and the readings above background on a organic vapor meter (OVM). The OVM is a field .portable photo ionization detector that uses a 10.2 eV lamp to detect compounds with ionization potential below 10.2 eV (hydrocarbon range). No reading above background (background = 1 to 2 ppm) was observed for the screened samples. 2.3 Soil Sample Analyses Soil samples were submitted to Sherwood Laboratories of Hilmar for analyses. These samples were tested for benzene, toluene; total xylenes and ethylbenzene (BTEX) by EPA method 8020, Total Petroleum Hydrocarbons as Gasoline (TPH- Gasoline) by EPA method 8015 modified, total lead, and ethylene dibromide by 8010 modified. The detection limit for benzene, toluene, ethylbenzene and total xylenes is 3.0 gg/kg (ppb) and 1.0 mg/kg for TPH-Gasoline. 2.4 Borehole Closure After successful) collecting the bottom hole soil sample from the last boring, the Y g P g� ' soil borings were closed by installing a granular bentonite plug at the bottom of the boring, hydrating it with tap water and then pumping a neat cement grout (augmented with <4% bentonite) to grade with a slurry pump and a tremie pipe. 2.5 Disposition of Soil Cutting Soil cutting generated during the soil boring installation was added to the depression at the former UST excavation. 3.0 RESULTS OF INVESTIGATION The data collected during this investigation have been summarized in the following sections. 3.1 Site Geology The subsurface geology is characterized by sand with,interbedded silt layers. The sand ranges in grain size from very fine to coarse (modified Wentworth scale). The sand contains varying amounts of a silt°matrix. In places the soil exhibited oxidized root casts which suggest that it is not a reducing environment (typical of