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i <br /> Margrave Property <br /> Report-Soil Boring Installation <br /> Project No.148.2 <br /> January 7,1994 <br /> Page 5 <br /> 4.1 Equipment <br /> Soil borings were drilled with a 7.25 inch (o.d.) hollow stem continuous flight <br /> auger, owned and operated by Osterberg and Stewart, Inc. (C57 license # 446670). <br /> Soil samples were collected using a 2.5 inch (i.d.) modified California split spoon <br /> sampler lined with brass sample using a continuous coring device. <br /> 4.2 Boring Logs <br /> A detailed log for each boring was maintained by a professional geologist <br /> working under the supervision of a registered geologist. The information noted <br /> g g g <br /> includes: sample depths, horizons of detectable contamination (detected by field <br /> methods), soil classification utilizing the Unified Soil Classification System and <br /> sediment description (color, texture, composition, hardness; moisture content, <br /> and post-depositional changes that have occurred in the sediments). <br /> 4.3 Cross Contamination Prevention <br /> revention <br /> All sample equipment (split spoon sampler or core .tube, brass tubes) and auger <br /> (drilling rod, drilling bits, & auger) was thoroughly cleaned before being used and <br /> between uses. Plastic gloves were worn during sample collection and changed <br /> between all samples. <br /> 4.4 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 <br /> the sample is collected to its ultimate disposal. A CofC form was filled out for all <br /> samples collected. The CofC is tracked to ensure sample integrity. <br /> 4.5 Sample Analyses <br /> Soil samples were analyzed for benzene, toluene, ethyl benzene and total xylenes <br /> (BTEX) by EPA method 8020 and total <br /> petroleum hydrocarbons asgasoline (TPH- <br /> Gasoline) by EPA method 8015 modified. The detection limit for benzene, <br /> toluene, ethylbenzene and total xylenes is 5.0 gg/kg (ppb), and 5.0/50 mg/kg for <br /> TEPH. One sample (SB-1 9.5-10.0)'was also tested for the fuel constituents lead <br /> and ethylene dibrornide. <br /> The samples were test <br /> p ed at Sherwood Laboratories of Hilmar, California State <br /> Certification #1400. <br />