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f <br /> Geological Technics Inc. <br /> Page 1 <br /> j Appendix C Quality Assurance Program <br /> r Former Moresco Property <br /> {— October 11, 1996 <br /> i <br /> 1.0 QUALITY ASSURANCE PROGRAM <br /> The following measures were taken by Geological Technics Inc. to ensure that a high quality <br /> study was conducted and that cross contamination does not occur. <br /> 1.1 Equipment <br /> Soil borings were drilled with a 7.25 inch(o.d.) hollow stem continuous flight auger, owned <br /> g g <br /> and operated by Osterberg & Stewart Inc. (C5.7-license # 446670). Soil samples were <br /> collected using a 2.5 inch (i.d.) modified. California split spoon-sampler lined with brass <br /> sample using a continuous coring device. <br /> 1.2 Boring Logs <br /> A detailed to for the boring was maintained b a rofessi <br /> g g y professional geologist working under the <br /> supervision of a registered geologist. The information noted includes: sample depths, <br /> horizons of detectable contamination (detected by field methods), soil classification utilizing ' <br /> the Unified Soil Classification System and sediment description (color, texture, composition, i <br /> hardness, moisture content; and post-depositional changes that have occurred in the <br /> sediments). <br /> 1.3 Cross Contamination o taminatxon Prevention <br /> All sample equipment (split spoon sampler or core tube, brass tubes, bailer, & pumps) and j <br /> auger (drilling rod, drilling bits, & auger) was thoroughly cleaned before being used and <br /> between uses. Plastic gloves were wom during sample collection and changed between all <br /> samples. j <br /> 1.4 Chain of Custody <br /> Chain of Custody (CofC) forms are legal documents used to track the handling of samples <br /> All dates, times, persons and their companies are,listed,from the time the sample, is collected <br /> to.its ultimate disposal. A CofC form was filled out for all samples collected. The CofC is <br /> tracked to ensure sample integrity. <br /> 1.5 Sample Analyses <br /> Soil samples were analyzed for benzene, toluene, ethyl benzene and total xylenes (BTEX) by <br /> EPA method 8020 and total extractable petroleum hydrocarbons (TEPH) by EPA method <br /> 8015 modified. The detection limit for benzene, toluene; ethyibenzene and total xylenes is <br /> 5.0 pg/kg (ppb), and 5.0/50 mg/kg for: TEPH. The samples were tested at Sherwood 3 <br /> Laboratories of Hilmar, California State Certification#1400. <br /> I <br />