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R&B Trucking Project No.01-37.1.1 March 27,1990 Page 8 7.0 QUALITY ASSURANCE PROGRAM The following measures were taken by Geological Technics to insure that a high quality study was conducted and that cross contamination did not occur. 7.1 Equipment Soil borings were drilled with a 10.25 inch (O.D.)hollow stem continuous flight auger, owned and operated by Osterberg and Stewart,Inc. Soil samples were collected using a 2 inch(O.D.) modified California split spoon sampler lined with brass sample tubes. 7.2 Boring Logs Detailed logs were made of each boring. The information noted included: sample depths,blow counts,horizons of detectable contamination (detected by field methods), soil classification utilizing the Unified Soil Classification System and sediment description(color,texture,composition,hardness,moisture content,and post- depositional changes that have occurred in the sediments). 7.3 Soil Sampling Soil samples were collected at 3 foot intervals to characterize the sediment type. No soil samples were analyzed from any boring. 7.4 Sample Screening Because not every soil sample collected is analyzed,a screening process is used to select representative samples. The goal of this selective process is to reduce the cost of the project without compromising the quality. From field observations noting sediment type (especially grain size and clay content),moisture content,visible evidence of contamination(i.e.,color change due to reduction of iron or discoloration from hydrocarbons and other pollutants),and the presence of contamination odor will be used to select samples for analysis. A representative sample from each lithology will be analyzed. Also,one sample will be collected and analyzed from 10 feet below the last observable contamination. This should confirm that the bottom of the contaminated zone has been reached. 7.5 Disposition of Soil Boring Cuttings Soil cuttings were spread on site for aeration.