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F <br /> t <br /> FIELD METHODS AND PROCEDURES <br /> R AND LIQUID-PHASE HYDROCARBON DEPTH ASSESSMENT <br /> inter ace probe was used to assess the thickness of liquid-phase hydrocarbon (LPH) <br /> ter level indicator was used to assess ground water depth in monitoring wells that do <br />)epth to ground water was measured from the top of each monitoring well casing. <br /> level indicator was subjectively analyzed for hydrocarbon sheen. All measurements <br /> ations were recorded in the field. <br /> 2.0 SUBJECTIVE ANALYSIS OF GROUND WATER <br /> water sample was collected from the monitoring well for subjective analysis. The <br />�d by gently lowering a clean, disposal bailer to approximately one-half the bailer <br />[quid interface. The bailer was then retrieved and the sample contained within the <br />[ for floating LPH and the appearance of an LPH sheen. <br /> 3.0 MONITORING WELL PURGING AND SAMPLING <br /> Le monitoring wells were purged using a centrifugal pump until pH, temperature, and <br /> urge water had stabilized and a minimum of three to four well volumes of water had <br /> water removed from the wells was stored in 55-gallon barrels at the site. The <br /> I with corresponding monitoring well numbers and the date of purging. After <br /> er levels were allowed to stabilize. A ground water sample was then removed from <br />>ing a disposal bailer. If the well was purged dry, it was allowed to sufficiently <br /> le was collected. Samples were collected in air-tight vials, appropriately labeled, and <br /> i the time of collection through the time of delivery to the laboratory. A <br /> n was completed to ensure sample integrity. Ground water samples were transported <br />. analyzed within the EPA-specified holding times for the requested analyses. Purge <br /> ted from the storage barrels in a vacuum truck and transported to an appropriate <br /> and/or disposal. <br /> • <br /> t.RPl04.CAC <br />