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30 May 2000 AGE-NC Project No. 97-0372 Page 15 of 17 by AGE personnel to a DHS-certified laboratory or will shipped via an overnight carrier as described above. 5.5. LABORATORY ANALYSIS OF SELECTED SOIL SAMPLES A minimum of one soil sample per boring will be analyzed for pH, total cyanides and the target metals according to the methods noted below. Additional samples may be analyzed based on initial results. Initially, the shallowest sample from each boring will be analyzed, with deeper samples analyzed only to define vertical extent. The 10-foot sample from the B7 twin boring will be initially analyzed as the 2-foot and 5-foot samples from B7 were found to be impacted. If significantly deep impacted soil is encountered, soil samples from greater depth in adjacent borings, if available and appropriate, will also be analyzed to define the descending and laterally spreading plume. The samples selected for analysis will be analyzed in accordance with the following analytical methods and practical quantitation limits (PQL), providing there is no matrix or competing analyte interference: • EPA Method 9045 for pH; • EPA Method 6010 for total lead, cobalt, copper, nickel, chromium, and zinc (PQL 5 mg/kg chromium and lead, 10 mg/kg cobalt, copper, nickel and zinc); • EPA Method 335.2 for total cyanide (PQL 0.20 mg/kg). Individual analytes will be dropped from successive analytical rounds if not needed for plume definition. 5.6. LABORATORY ANALYSIS OF GROUND WATER SAMPLES Each ground water sample will be analyzed in accordance with: • EPA Method 150.1 for pH; • EPA Method 200.7 for total chromium, copper,nickel, and zinc (PQL 0.01 mg/1 chromium, nickel and zinc, 0.02 mg/1 copper); • EPA Method 200.9 for lead (PQL 0.005 mg/1); • EPA Method 335.2 for total cyanide (PQL 0.02 mg/1); and • EPA Method 8010B for halogenated VOAs (PQL 0.5 12g/1) Advanced GmEnvirenmcntal,Inc