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VL Sulfide Ton <br /> Sulfide ions present in the sail are indicative of anerobic conditions. under <br /> these conditions, sulfate reducing bacbaria can greatly accelerate the rage of <br /> corrosion on ferrous materials. The bacberia reduce sulfates to sulfides and in <br /> the process oxidize iron. Soil samples are tested for the presence of sulfide ions <br /> to an accuracy of +1 ppb. The solution extracted from the sdl sample is tested <br /> through the use cf a specific ion probe (silver/sulfide electrode) in conjunction <br /> with an Orion Research Digital lonalyzer. The test procedure exceeds the <br /> requirements of EPA Standard Test Method 376.1. <br /> VII. Moisture Content <br /> When soil samples are collected, they are immediately sealed in sample jars to <br /> prevent evaporation and/or contamination. Moistr-ire content cif the samples is <br /> determined using ASTM Standard Test Method D22-16--80. A part of the sail <br /> sample is weighed, dried for 24 hours in an oven at 1100C, then weighed again. <br /> The moisture content is calculated from the weight lres to an accuracy of <br /> +0.1%. <br /> The mare content is a significant parameter in defining the cc rrosivity of a <br /> sail environment For underground tank evaluations, test borings allow for a <br /> determination of the variations in moisture convent with depth. The depth of <br /> the water t;a.ble is also noted on the baring logs when encounter. <br /> VIIL Hydrocarbons <br /> The presence of hydrocarbons in the soil is detected bath in the fid and <br /> laboratory th-rough the use of a Sensidyne, High-Precision Gas Sampling System. <br /> Through the use of chromatographic tubes, gasoline concentrations can be <br /> detected from 30 to 1000 ppm. Tests for ether hydrocarbons can also be <br /> performed when necessary. <br /> 4 <br />