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3. Company Health and Safety Coordinator Name: Ray Kablanow Phone No: (209)538-6424 ' 2.0 QUALITY ASSURANCE PROGRAM The following measures will be taken by Geological Technics Inc.to ensure that a high quality study ' is conducted and that cross contamination does not occur. 2.1 Equipment ' Soil borings may be drilled with a hollow stem continuous flight auger,owned and operated by a licensed well driller. Soil samples may be collected using a 2 inch(i.d.)modified California split ' spoon sampler,or continuous coring device,lined with brass sample tubes. 2.2 Boring Logs ' A detailed log will be made of each boring. The information to be noted includes: sample depths, blow counts if continuous coring devise is not used,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). ' 2.3 Cross Contamination Prevention All sample equipment(split spoon sampler or core tube,brass tubes etc.)and auger(drilling rod, jr drilling bits,&auger,etc.) will be thoroughly cleaned before being used and between uses. Wash water may be containerized in DOT approved 55 gallon drums,labeled,and stored on site until their disposition can be arranged. Plastic gloves will be worn during sample collection and changed between all samples. 2.4 Chain of Custody Chain of Custody(CofC)forms are legal documents used to track the handling of samples All dates,times,persons and their companies will be listed from the time the sample is collected to its ultimate disposal. A CofC form will be filled out for all samples collected. The CofC will be tracked ' to ensure sample integrity. 2.5 Sample Analysis ' Soil samples will be analyzed for benzene, toluene,ethyl benzene and total xylenes(BTEX),EPA methods 8020 and 602,and for total volatile hydrocarbons-gasoline,EPA method 8015 modified. The analyses will be performed by Sherwood Laboratories of Hilmar.,California State Certification ' #1400. 2.6 Data Reduction Analytical data will be integrated with the geological data gathered during field investigation. Cross sections will be prepared to illustrate the stratigraphy and the distribution of soil contamination. The cross sections may be used for interpreting the extent of contamination.