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• Resource Conservation and Recovery Act (RCRA) Groundwater Monitoring Technical <br /> Enforcement Guidance Document, Office of Solid Waste and Emergency Response <br /> (OSWER) 9950 1, September 1986 <br /> • Test Methods for Evaluating Soled Waste Physical/Chemical Methods, EPA SW-846, <br /> 3rd edition, November 1986 <br /> • Methods for Organic Chemical Analysis of Municipal and Industrial Waste Water, <br /> EPA-600/4-82-057, July 1982 <br /> • Methods for Organic Chemical Analysis of Water and Wastes, EPA-600/4-79-020, <br /> revised March 1983 <br /> • Leaking Underground Fuel Tank (LUFT) Field Manual, California State Water <br /> Resources Control Board, revised October 1989 <br /> Sample Collection <br /> Sample collection procedures include equipment cleaning, water level and total well depth <br /> measurements, and well purging and sampling <br /> . Equipment Cleaning <br /> Before the sampling event was started, equipment that was used to sample groundwater was <br /> disassembled and cleaned with detergent water and then rinsed with deionized water During field <br /> sampling, equipment surfaces that were placed in the well or came into contact with groundwater <br /> during field sampling were steam cleaned with deionized water before the next well was purged or <br /> sampled <br /> Water Level, Floating Hydrocarbon, and Total Well Depth <br /> Measurements <br /> Before purging and sampling occurred, the depth to water, floating hydrocarbon thickness, and <br /> the total well depth were measured using an oil/water interface measuring system The oil/water <br /> interface measuring system consists of a probe that emits a continuous audible tone when <br /> immersed in a nonconductive fluid, such as oil or gasoline, and an intermittent tone when <br /> immersed in a conductive fluid, such as water The floating hydrocarbon thickness and water level <br /> were measured by lowering the probe into the well Liquid levels were recorded relative to the <br /> tone emitted at the groundwater surface The sonic probe was decontaminated by being rinsed <br /> with deronized water or steam cleaned after each use A bottom-filling, clear Teflon bailer was <br /> used to verify floating hydrocarbon thickness measurements of less than 0 02 foot Alternatively, <br /> an electric sounder and a bottom-filling Teflon bailer may have been used to record floating <br /> hydrocarbon thickness and depth to water <br /> SAC\N\PJOM05\08051460 7DS-96\11b 2 A-3 Rev 0, 10/25/96 <br />