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• <br />is <br />Groundwater Monitoring and Samvlin <br />Decontamination Procedures <br />All physical parameter measuring and sampling equipment are decontaminated prior to sample collection using <br />Alconox or equivalent detergent followed by steam cleaning with detonized water During field sampling, equipment <br />placed in a well are decontaminated before purging or sampling the next well by cleaning with Alconox or equivalent <br />detergent followed by steam cleaning with deionized water <br />Water -Level Measurements <br />Prior to sampling each well, the static water level is measured using an electric sounder and/or calibrated portable <br />oil -water interface probe Both static water -level and separate -phase product thickness are measured to the nearest <br />±0 01 foot The presence of separate -phase product is confirmed using a clean, acrylic or polyvinylchloride (QVC) <br />bailer, measured to the nearest ±0 01 foot with a decimal scale tape The monofilament line used to lower the bailer <br />is replaced between borings with new line to preclude the possibility of cross -contamination Field observations (e g <br />product color, turbidity, water color, odors, etc ) are noted Water -levels are measured in wells with known or <br />suspected lowest dissolved chemical concentrations to the highest dissolved concentrations <br />Sample Collection and Labelin <br />A temporary PVC screen is installed in the boring to facilitate a grab groundwater sample collection Samples of <br />groundwater are collected from the surface of the water in each well or boring using the teflon bailer or a pump The <br />water samples are then gently poured into laboratory -cleaned containers and sealed with teflon-Itned caps, and <br />inspected for air bubbles to check for headspace The samples are then labeled by an adhesive label, noted in <br />permanent ink, and promptly placed in an ice storage A Chain -of -Custody Record is initiated and updated throughout <br />handling of the samples, and accompanies the samples to the laboratory certified by the State of California for analyses <br />requested <br />A-3 <br />