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1 PID measurements of soil-vapors were taken at various locations within the exploratory excavations, as <br /> ' well as within the spoils piles located in the immediate area. PID measurements ranged from 0 to 900 <br /> ppm and were used to help plan the subsequent soil sample locations. PID measurements and the <br /> layout of the exploratory excavations were documented in the field on hand-drawn notes, and were <br /> additionally surveyed by Umetco personnel using a global positioning system survey instrument. <br /> ' No free product was observed in any of the exploratory excavations. Based on PID measurements and <br /> ' soil sample results (see Section 6), the soil contamination generally extends down to the caprock layer. <br /> It is unknown whether the contamination extends down into the caprock layer(s). <br /> PID measurements taken at various points around the mine spoil material in the immediate area (which <br /> was being handled at the time that the soil-vapor odors were first noticed) indicated that the majority of <br /> that mine spoil material is contaminated with petroleum. <br /> 6.0 SOIL SAMPLING <br /> A track-hoe was utilized to excavate trenches down to the top of the caprock layer in the area of the <br /> ' suspected diesel spill, in order to gain access to the subsurface soils for the performance of the PID <br /> ' measurements and soil sampling. <br /> ' Soil samples were collected into new, clean glass sample jars using new, clean stainless steel scoops. <br /> Care was exercised to completely fill each sample jar with no headspace. The jars were sealed with <br /> ' tight-fitting lids with teflon lid seals and immediately stored on ice in a portable cooler. <br /> ' Soil samples were collected from twenty-four locations within the exploratory excavations for <br /> laboratory analysis for BTEX by EPA Method 8020 and for TEPH by Method 8015 Modified (see <br /> 1 <br /> 10 <br />