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9 <br /> 1.0 METHODS <br /> I.1 soil Sampling <br /> soil borings and soil sampling were performed under the direction of <br /> an Aegis engineer or geologist. The soil borings were advanced using a <br /> truck-mounted hollow-stem auger drilling rig. <br /> To reduce the possibility of cross-contamination between boreholes, <br /> all downhole drilling equipment was steamed cleaned between each <br /> boring. To reduce cross-contamination between samples, the split <br /> barrel sampler was washed in a soap solution and raouble-rinsed between <br /> each sampling event. <br /> Soil sampling was done in accordance with ASTM 1586-84. Using this <br /> procedure, .a two-inch O.D. split-barrel sampler or a two-inch J.D. <br /> California-type sampler is driven into the soil by a 140-pound weight <br /> falling 30 inches. After an initial set of 6 inches, the number of <br /> blows required to drive the sampler an additional 12 inches is known <br /> as penetration resistance, or the "N" value. The N value is used as an , <br /> empirical measure of the relative density of cohesionless soils and <br /> the consistency of cohesive toils. <br /> J Upon recovery, a portion of the soil sample was planed inco a glass <br /> jar and sealed for later screening with a photoioni2ation detector. <br /> Another portion of the soil sample was used for classification and <br /> description. That part of the soil sample collected in a brass tube <br /> within the California-type sampler was stored on ice, s.n an ice chest <br /> for transport to the laboratory. <br /> 1.2 soil Classification <br /> As the samples were obtained. in the field, they were classified by the <br /> . ` geologist in accordance with the Unified Soil Classification System <br /> (USCS) . Representative portions of the samples were then returned to <br /> - the laboratory for further examination and for verification .of the <br /> j. field classification. Logs of the borings, indicating the depth and <br /> identification of the various strata, the N value, and pertinent <br /> information regarding the method of maintaining and advancing the <br /> borehole were also made. <br /> i. 1.3 soil Sample screening Portable Photoioni.zation Detector Method <br /> After soil sample jars were brought to ambient tF:mperature, the head <br /> space of the soil sample jars was screened with a portable <br /> photoionization detector equipped .with' a 10.2 WV lamp calibrated to <br /> 1 benzene for direct reading in ppm. The sample .jar lid was opened and <br /> the detector probe immediately placed within the head space of the <br /> --- highest---observed..-.reading--was._recorded.._.,-- _--- ----------- —_-- --------____ —__-- <br /> 2.0 ANALYTICAL PROCEDURES <br /> All soil samples submittedto the laboratory.were analyzed for Total <br />