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.� I%W `sP <br /> _ R&B Trucking <br /> Preliminary Site Assessment <br /> Page: 7 <br /> 5.3 Soil Sampling <br /> Soil samples will be collected at 3 foot intervals to characterize the sediment types and <br /> for laboratory analysis. Up to four soil samples will be analyzed from this boring, <br /> dependent upon stratigraphy and depth. Brass sample tubes will be sealed with <br /> aluminum foil,capped,labeled and immediately refrigerated until project completion. <br /> — <br /> 5.4 Sample Screening <br /> _ Because not every soil sample collected will be analyzed,a screening process is used to <br /> select representative samples. The goal of this selective process is to reduce the cost of <br /> the project without compromising the quality. From field observations noting sediment <br /> type (especially grain size and clay content),moisture content,visible evidence of <br /> contamination(i.e.,color change due to reduction of iron or discoloration from <br /> hydrocarbons and other pollutants),and the presence of contamination odor will be used <br /> to select samples for analysis. A representative sample from each lithology will be <br /> analyzed. Also,one sample will be collected and analyzed from 10 feet below the last <br /> observable contamination. This should confirm that the bottom of the contaminated <br /> zone has been reached. <br /> 5.5 Disposition of Soil Boring Cuttings <br /> Soil cuttings will be stockpiled on site with the other soil removed during the <br /> excavation. <br /> 5.6 Cross Contamination Prevention <br /> All sampling equipment(split spoon sampler,brass tubes,bailer,&pumps)and auger <br /> (drilling rod,drilling bits,&auger) will be thoroughly steam cleaned before being used <br /> and between uses. Plastic gloves will be worn while collected and changed between all <br /> samples. <br /> 5.7 Chain of Custody <br /> Chain of Custody(CofC)forms are legal documents used to track the handling of <br /> samples. All dates, times,persons,and their companies are listed from the time the <br /> sample is collected to its ultimate disposal. A CofC form will be filled out for all <br /> samples collected. The CofC is tracked to insure sample integrity. <br />