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filled completely without headspace. Samples for organic analysis are not filtered or <br /> chemically preserved. <br /> All water samples will be labeled, chilled and processed as described in Section 3.1. <br /> • Projects requiring a Quality Level of 2 or 3 may have select duplicate samples collected in <br /> the field or replicate analysis conducted to validate the reliability of the sample. A trip blank <br /> and equipment blank may also be submitted. Blanks and duplicate samples will be labeled, <br /> stored, and handled identically to all other samples. <br /> Water samples for heavy metal or inorganic constituents will be collected in clean, acid- <br /> rinsed EPA-approved vials or bottles. Before sampling, the bottle will be rinsed several <br /> times with the water to be sampled. The water will be filtered using a 0.45 µm membrane <br /> filter. Filtering removes the large colloids and sediments. At least 500 ml of water will be <br /> collected from each site. Samples will be acidified with HNO3 to a pH of approximately 2. <br /> This will insure that the cations will remain in solution. Samples for anions and other <br /> — <br /> constituents will be collected in raw state, unfiltered and untreated. <br /> These well sampling procedures are designed to: <br /> • ensure that well water samples are representative of formation waters. <br /> • ensure that all sample descriptions and field observations are consistent and <br /> accurate. <br /> • minimize the risk of cross-contamination between samples. <br /> 3.4 Surface Water Sampling Procedures <br /> Plastic, vinyl or Nitrile gloves will be worn during sampling and changed between samples. <br /> • Normally two samples will be collected from each site, in case additional analytical work is <br /> required later. The samples will be carefully handled to prevent agitation and subsequent <br /> aeration. The samples will be immediately transferred to EPA-approved VOA bottles/vials <br /> of appropriate size, and filled completely without headspace. <br /> • All water samples will be labeled, chilled and processed as described in Section 3.1. <br /> — <br /> Projects requiring a Quality Level of 2 or 3 may have select duplicate samples collected in <br /> the field or replicate analysis conducted to validate the reliability of the sample. A trip blank <br /> may be submitted to ensure sample integrity. Blanks and duplicate samples will be labeled, <br /> stored, and handled identically to all other samples. <br /> American Geological Services, Inc. <br /> 6 <br />