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low k" KLEINFELDER <br />Soil -gas concentrations were measured by Hydro -Search on April 28 with an <br />HNU PID device, using 10.2 eV bulb. A PID can detect only hydrocarbons <br />that have ionization potentials at or below the ionization potential of <br />the bulb being used. Hydro -Search intended to monitor the soil borings <br />for methane concentration. Methane has an ionization potential of greater <br />than 12 eV, making a PID equipped with a 10.2 eV bulb ineffective in <br />detecting methane. <br />Hydro -Search returned to the site on May 6, 1988, with a combustible gas <br />analyzer. The borings (MB -1 through MB -10) were uncovered and the open <br />holes monitored with a combustible gas analyzer. <br />The following is a list of PID and combustible ga7s readings made at the <br />site: <br />Gas Monitoring PID Combustible Gas Monitoring PID Combustible <br />Boring Reading Gas Reading -Boring--7 Reading Gas <br />---------- If <br />Reading <br />MB -1 <br />0 <br />ppmv <br />0% <br />MB -6 <br />0 <br />ppmv <br />0% <br />MB -2 <br />0 <br />ppmv <br />0% <br />MB -7 <br />0.2 <br />ppmv <br />0% <br />MB -3 <br />0 <br />ppmv <br />0% <br />M3-8 <br />0.2 <br />DDMV <br />0% <br />MB -4 <br />0 <br />ppmv <br />0% <br />MB -9 <br />0.6 <br />ppmv <br />-0%1 <br />MB -5 <br />0 <br />ppmv <br />0% <br />",,MB -10 <br />1.6 <br />ppmv <br />0% <br />The readings at MB -9 and MB -10 were made in soil borings near a diesel <br />DumD located at the southwest corner of the maintenance garage. These <br />readings may be due to diesel contamination as diesel -stained soil was <br />observed about the diesel pump. <br />4.5 WATER SAMPLING <br />Water samples were collected from a domestic water well located near the <br />maintenance garage (see Figure 2) on April 28, 1988 and May 6, 1988. <br />Table 1 lists the sample number, sample description, and date the sample <br />was collected. <br />104-88-683 8 <br />