ARCHIVED REPORTS XR0001141 - Laserfiche WebLink

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I Sample Collection Sample collection procedures include equipment cleaning, water-level and total well-depth measurements, and well purging and sampling Equipment Cleaning Before the sampling event is started, equipment that will be placed in the well or oil come in contact with ground water %nil be disassembled and cleaned thoroughly %nth detergent water, and then steam cleaned with deionized water Dunng field sampling, equipment surfaces that are placed in the well or contact ground water will be steam cleaned with deionized water before the next well is purged or sampled Water-level, Floating Hydrocarbon, and Total Well-depth Measure- ments Before purging and sampling occurs, the depth to water, floating hydro- carbon thickness, and the total well depth will be measured using an oiltwater interface measunng system. The oil/water interface measuring . system consists of a probe that emits a continuous audible tone when immersed in a nonconductive fluid, such as oil or gasoline, and an inter- mittent tone when immersed in a conductive fluid, such as water Liquid levels oil be recorded relative to the tone emitted at the ground-water surface The probe well be decontaminated by rinsing with a nonphosphate detergent solution and then double rinsing with deiornzed water or steam cleaning after each use. Alternatively, an electric sounder and a bottom- filling, dear Teflon® baler may be used to record floating hydrocarbon thickness and depth to water The electric sounder is a transistonzed instrument that uses a reel- mounted, two-conductor, coaxial cable that connects the control panel to the sensor Cable markings are stamped at 1 foot intervals The water level will be measured by lowering the sensor into the monitoring well. A low-current c4rcwt is completed when the sensor contacts the water, which Iserves as an electrolyte. The current is amplified and fed into an indicator light and audible buzzer, signaling when water has been contacted. A sensitivity control compensates for highly saline or conductive water. The electric sounder will be decontaminated by nnsing with a nonphosphate detergent solution and then double nnsmg with deionized water after each IPRA P91 K022 AOW Rev 0 February 7, 1992