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r <br /> r <br /> 1 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 3 5 inch (o d ) hand auger, owned and operated by Geological <br />' Technics Inc Soil samples were collected using a 2 0 inch (i d) spoon sampler lined with <br /> brass sample using a continuous coring device <br />' 1.2 Cross Contamination Prevention <br /> All sample equipment (spoon sampler or core tube, brass tubes, bailer, & pumps) and auger <br />' (drilling rod, drilling bits, & auger) was thoroughly cleaned before being used and between <br /> uses Plastic gloves were worn during sample collection and changed between all samples <br /> 1.3 Cham of Custody <br /> Chain of Custody (CofQ forms are legal documents used to track the handling of samples All <br /> dates, tunes, persons and their companies are listed from the time the sample is collected to its <br /> ultimate disposal A Coif form was filled out for all samples collected The CofL is tracked <br /> to ensure sample integrity <br />' 1.3 Sample Analyses <br /> P Y <br />' Soil boring samples were analyzed for total extractable petroleum hydrocarbons (TEPH) an <br /> Total Petroleum Hydrocarbons as gasoline (TPH-G) by EPA method 8015 modified The <br />' detection limit for TEPH is 5 0 mg/kg and for TPH-G is 1 0 mg/kg The samples were also <br /> tested for benzene, toluene, ethylbenzene, and xylene (BTEX) using EPA method 8020 <br /> Selected samples were also tested for MTBE using method 8020 and for total lead using EPA <br />' method 8240 The samples were tested at Sherwood Laboratories of Rimar, California State <br /> Certification#1400 and at Entech Analytical Labs of Sunnyvale, CA, Certification#1469 <br /> I <br />