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08 September 2000 <br />AGE -NC Project No. 97-0372 <br />Page 17 of 18 <br />Soil samples found to be impacted by total metals concentrations exceeding background <br />concentrations and the soluble threshold limit concentration (STLC) by a factor of ten will be <br />analyzed for the soluble metal concentration for each metal that exceed these concentrations. The <br />soluble metals concentrations will be determined by: <br />• EPA Method T22/6010 for soluble chromium; <br />• EPA Method 6010 for soluble zinc; <br />• EPA Method 7210 for soluble copper; <br />• EPA Method 7520 for soluble nickel; and <br />• EPA Method 6010 for soluble cobalt. <br />Individual analytes will be dropped from successive analytical rounds if not needed for plume <br />definition. <br />5.6. LABORATORY ANALYSIS OF GROUND WATER SAMPLES <br />Each ground water sample will be analyzed in accordance with: <br />• EPA Method 150.1 for pH; <br />• EPA Method 200.7 for total chromium, copper, nickel, and zinc (PQL 0.01 mg/1 chromium, <br />nickel and zinc, 0.02 mg/1 copper); <br />• EPA Method 200.9 for lead (PQL 0.005 mg/1); <br />• EPA Method 335.2 for total cyanide (PQL 0.02 mg/1); and <br />• EPA Method 8010B for halogenated VOAs (PQL 0.5 µg/1) <br />5.7. DECONTAMINATION <br />All sampling equipment will be decontaminated prior to use by washing in an Alconox solution and <br />using three rinses with tap water. Glass and plastic sample containers will be precleaned by the <br />laboratory that supplies them. Brass sleeves utilized for soil samples will be clean new ones or <br />decontaminated as described for the sampling equipment. Rinsate water generated by the <br />decontamination process will be containerized in a DOT -approved 55 -gallon drum, labeled, and <br />Advanced GeoEnvironmental, Inc <br />