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1 <br /> Water Sample Labeling and Handling <br /> ' Sample containers are labeled in the field with the fob number, sample location, depth of <br /> sample (if appropriate), and date of sample and promptly placed in iced storage for transport to <br /> the laboratory A Chain of Custody Record is initiated by the geologist and updated <br /> throughout handling of the samples and accompanies the samples to a laboratory certified by <br /> the State of California Samples are transported to the laboratory promptly to help ensure that <br /> ' recommended sample holding times are not exceeded <br /> Reporting Results of Analyses <br /> ' Hydrocarbon constituents in soil samples are typically reported in units of parts per million <br /> (ppm) Hydrocarbon constituents in groundwater samples are typically reported by the <br /> ' laboratory in units of parts per billion (ppb) <br /> Evaluating the Groundwater Flow Direction and Gradient <br /> ' The elevations and positions "x" and " lateral coordinates of the monitoring well are <br /> p { y } g <br /> surveyed with respect to a local datum that references the elevation according to mean sea <br /> level The elevation of the monitoring wells are measured within 0 01 foot of the local datum <br /> The horizontal distances are measured to the nearest 0 1 foot The elevations are typically <br /> measured from either a notch or an arrow marked on the top northern edge of the well casing <br /> The groundwater elevation for each monitoring well is calculated by subtracting the depth to <br /> ' water from the wellhead elevation The groundwater elevation information is used to construct <br /> a potentiometnc surface map, which is used to evaluate the direction of groundwater flow and <br /> the magnitude of the groundwater gradient <br /> 1 <br /> 1 <br /> 1 <br /> SHELLSIFLDMTHDS doc 4 <br /> 1 <br />