2014-01-29_HYDROLOGY - P2009025 (8)

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SOP for Decontamination of Field Sampling Equipment — Hansen Project 1 1. INTRODUCTION The purpose of this document is to define the standard procedure for decontamination for surface water and groundwater sampling at the Hansen Project, Fremont County, Colorado. Decontamination of sampling equipment and field support equipment is necessary to prevent sample cross - contamination and to ensure that sample results are representative. This document describes the materials and processes for decontaminating the equipment used in field sampling. This Standard Operating Procedure (SOP) serves as a supplement to the Quality Assurance Project Plan (QAPP) and the Baseline Hydrologic Monitoring Plan. Disposable or expendable sampling and personal protective equipment will be used when possible. If equipment used is not dispensable and has the potential to contact the sample, decontamination will be performed according to the methods outlined in this SOP. 2. EQUIPMENT • Plastic brushes • Wash tubs or 5- gallon buckets • Plastic scrapers • Steam cleaner or high - pressure sprayer • Disposal drums • Sponges or paper towels • Laboratory - grade, low sudsing, nonphosphate detergent (e.g. Alconox®, Liquinox®) • Potable water • Deionized or distilled water, including laboratory -grade distilled or deionized water • Spray bottles or garden -type water sprayer • Clean plastic sheeting and/or trash bags 3. DECONTAMINATION PROCEDURES 3.1 On -site Decontamination Procedures This section provides step -by -step procedures for equipment decontamination in the field. Before any sampling begins, all field instruments (e.g. pH, conductivity, Oxydgen Reduction Potential (ORP), and Dissolved Oxygen (DO) probes), well probes, and other sampling devices shall be decontaminated. The following steps will be used to decontaminate field sampling equipment on site: 1. Personnel will dress in suitable safety equipment to reduce personal exposure and prevent cross contamination. Latex gloves will be worn during equipment decontamination and changed regularly as needed. 2. Remove gross contamination on equipment with scraper, high pressure hot water rinse, and plastic brush, if necessary. 3. Equipment that will not be damaged by water will be placed in a wash tub or 5- gallon bucket containing potable water and Alconox®, Liquinox®, or low - sudsing detergent, and scrubbed with a plastic brush or similar utensil. 4. Equipment will be rinsed in a second wash tub containing tap water or distilled water (or rinsed by spraying from a garden -type sprayer filled with tap water or distilled water). 5. Equipment will be rinsed again using deionized or distilled water from a garden -type sprayer or hand- held squirt bottle. 6. Equipment that may be damaged by water will be carefully wiped clean using a sponge and detergent water and rinsed with distilled or deionized water. Care will be taken to prevent any equipment damage. 4153A.140129 Whetstone Associates