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Groundwater Quality Sampling Plan <br /> equipment will be constructed of materials that will not alter the quality of the <br /> groundwater samples. Other sampling equipment may include the following: <br /> • Water level indicator; <br /> • Combination water quality meter for measuring pH, temperature, and <br /> conductivity; <br /> • Water quality meter calibration solutions; <br /> • Disposable gloves (nitrile, latex, or other appropriate material); <br /> • Distilled or deionized water, <br /> • Phosphate-free environmental detergent such as AlconoxTm; <br /> • Spray bottles for decontamination solution wash and rinse; <br /> • Peristaltic pump with associated tubing; <br /> • Battery or power for peristaltic pump; <br /> • 0.45-micron filter(s) if field-filtering is necessary; <br /> • Plastic sheeting to prevent possible contamination of sampling equipment; <br /> • Ziploct freezer bags for sample storage and shipping; <br /> • Paper towels; <br /> • 5-gallon plastic buckets for decontamination and purge volume <br /> measurement; <br /> • Sample bottles and sample preservatives; <br /> • Field forms including groundwater sampling data sheets, COC forms, and <br /> sample labels; <br /> • Coolers and ice. <br /> All of the groundwater purging and sampling equipment will be maintained in a clean <br /> and working condition. Sampling personnel will wear new disposable gloves while <br /> handling the sampling equipment that will be in contact with water samples. <br /> 4.3.3 Purging <br /> Prior to sample collection, each well will be purged of stagnant water using <br /> disposable or dedicated sampling equipment such as bailers and rope. Bailing <br /> will be performed at a rate that will minimize agitation of recovery waters and will <br /> continue until a minimum of three casing volumes have been purged and field <br /> parameters (pH, temperature, and conductivity) have stabilized, or the well is <br /> bailed dry. <br /> Field parameters will be measured at a frequency no greater than once per <br /> casing volume and purging will continue until there is less than ±10 percent <br /> change in three consecutive measurements of temperature and conductivity, and <br /> pH readings are within±0.2 standard units. If a well is bailed dry before removing <br /> three casing volumes, sample collection will begin when a sufficient amount of <br /> groundwater has entered the well. In this situation, field parameters will be <br /> measured at the start of sample collection and again after sample collection is <br /> �-,MOLEN ASSOCIATES LG Everist Sampling Plan <br /> Page 5 of 10 <br /> 44 <br />