Laserfiche WebLink
• GR Field Methods and Procedures <br />Groundwater Momtorins and Samplin <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 clearung with deionized water During field sampling, <br />equipment placed in a well are decontaminated before purging or sampling the next well by cleaning with Alconox <br />or equivalent 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 />10 01 foot The presence of separate -phase product is confirmed using a clean, acrylic or polyvinylchloride (PVC) <br />bailer, measured to the nearest f0 01 foot with a decimal scale tape The monofilament line used to lower the <br />bailer is replaced between borings with new line to preclude the possibility of cross -contamination Field <br />observations (e g product color, turbidity, water color, odors, etc ) are noted Water -levels are measured in wells <br />with known or suspected lowest dissolved chemical concentrations to the highest dissolved concentrations <br />Samtile Collection and Labelm <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 <br />The water samples are then gently poured into laboratory -cleaned containers and scaled with teflon -lined 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 <br />throughout handling of the samples, and accompanies the samples to the laboratory certified by the State of <br />California for analyses requested <br />• <br />A-3 <br />