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R&B Trucking 140W `AW <br /> Project No.01-37.1.1 <br /> March 27,1990 <br /> Page 9 <br /> 7.6 Cross Contamination Prevention <br /> All sample equipment(split spoon sampler,brass tubes,bailer,&pumps)and auger <br /> (drilling rod,drilling bits,&auger) were thoroughly steam cleaned before being used <br /> and between uses. Plastic gloves were worn during sample collection and changed <br /> between all samples. <br /> 7.7 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 was filled out for all samples <br /> collected. The CofC is tracked to insure sample integrity. <br /> 7.8 Sample Analysis <br /> The water samples were analyzed for benzene,toluene,total xylenes and ethyl benzene <br /> (BTX&E)using method 602 and total extractable petroleum hydrocarbons(TEPH)using <br /> method 3550 TEPH. The analyses were performed at ChromaLab,Inc. ,located at 2239 <br /> Omega Road in San Ramon,CA. The samples were transmitted to ChromaLab via <br /> GeoAnalytical Laboratories in Modesto, CA. GeoAnalytical Laboratories is in the <br /> process of obtaining certification. <br /> 7.9 Detection Limits of Analysis <br /> The detection limits for benzene, toluene and ethyl benzene are 0.3 gg/1 and for the <br /> total xylenes is 0.6 gg/l in water samples. Detection limits for TEPH in water samples <br /> are 0.5 mg/l for Kerosene and Diesel and 5.0 mg/l for Motor Oil. <br /> 8.0 HEALTH AND SAFETY PROGRAM <br /> Geological Technics has incorporated the following health and safety precautions while <br /> working on sites containing unidentified hazardous waste. Once the nature and extent of <br /> contamination has been determined,additional work on site will be met with the proper <br /> precautions. <br /> 8.1 Workers Health and Safety <br /> 8.1.1 Work Space Safety <br /> The perimeter of the work space should,if possible,be 20 feet from the drilling <br /> rig or excavation site. The working perimeter will be marked by brightly <br />