2014-01-29_HYDROLOGY - P2009025 (8)

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SOP for Surface Water Sampling — Hansen Project 5 3.5 Filtering Samples Samples for metals analyses will be filtered during the field sampling event by using a disposable filter apparatus and electric peristaltic or an electric drill powered pump. It will also be permissible to ship unfiltered unpreserved samples to the analytical laboratory for filtration on arrival. Filtered samples will be collected according to the following procedures: 1. Procedures for filtration using disposable in -line 0.45 µm filters: • Place the peristaltic pump on a flat surface and attach to power source (typically 12V outlet in field vehicle). • Don clean latex gloves. • Attach the pre -cut tygon tubing to one end of the 0.45 µm filter. • Thread the tubing through the pump head on the peristaltic pump. • Place the other end of the tygon tubing in the sample collection bottle. • Place the sample bottle at the discharge end of the filter and turn on the pump. • Fill the sample bottle. • Add preservatives as necessary and cap the sample. • Discard the used filter and tubing. 2. Procedures for filtration using disc or membrane 0.45 µm filters: • Assemble filter device according to manufacturer's instructions. • Filter sample by pouring sample in the top portion of filter unit. • Pump the sample through the disc or membrane filter using the hand pump. • Pump directly into the sample bottle or pump into a clean designated bottle then transfer the filtered sample to appropriate sample bottle. • Add preservatives as necessary and cap the sample. • Place the used filter membrane in a Ziplock® (or similar) bag for disposal. • Wash any reusable filtering equipment with deionized or distilled water and Liquinox® or equivalent soap, then rinse and store in a clean Ziplock® (or similar) bag, according to the SOP for Equipment Decontamination (Appendix B). 3.6 Field Quality Assurance /Quality Control Samples QA/QC samples will be collected during surface water sampling. QA/QC samples are designed to help identify potential sources of sample contamination and evaluate potential error introduced by sample collection and handling. All QA/QC samples are labeled with QA/QC identification numbers and sent to the laboratory with the other samples for analyses. Duplicate Samples: Duplicate samples are samples collected at the same time and location as the real sample to check for the natural sample variance and the consistency of field techniques and laboratory analysis. For the surface water sampling, a duplicate sample will be collected at the same time as the initial sample. The initial sample bottle for major ions will be filled simultaneously with the duplicate sample bottles for major ions, by pouring from the sample collection bottle into the real and duplicate sample bottles alternately until both bottles are filled, then moving to the real and duplicate sample bottles for TDS, and so on until all necessary sample bottles for both the initial sample and the duplicate sample have been filled. The duplicate sample will be handled in the same manner as the primary sample. The duplicate surface water sample will be assigned a unique sample ID, stored in an iced cooler, and shipped to the laboratory by express carrier. One duplicate surface water sample will be collected for each sampling round (e.g., approximately 10% duplicates). 4153A.140129 Whetstone Associates