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Water Sample Labeling and Handlin Sample containers are labeled in the field with the fob number, sample location, depth of sample (if appropriate), and date of sample and promptly placed in iced storage for transport to the laboratory A Chain of Custody Record is initiated by the geologist and updated throughout handling of the samples and accompanies the samples to a laboratory certified by the State of California Samples are transported to the laboratory promptly to help ensure that recommended sample holding times are not exceeded _Reporting Results of Anal s Hydrocarbon constituents In soil samples are typically reported in units of parts per million (ppm) Hydrocarbon constituents in groundwater samples are typically reported by the laboratory in units of parts per billion (ppb) Evaluatine the Groundwater Flow Direction and Gradient The elevations and positions ("x" and "y" lateral coordinates) of the monitoring well are surveyed with respect to a local datum that references the elevation according to mean sea level The elevation of the monitoring wells are measured within 0 01 foot of the local datum The elevations are typically measured from either a notch or an arrow marked on the top northern edge of the well casing The groundwater elevation for each monitoring well is calculated by subtracting the depth to water from the wellhead elevation The groundwater elevation information is used to construct a potentiometnc surface map, which is used to evaluate the direction of groundwater flow and the magnitude of the groundwater gradient Drilling Methods Before drilling begins, SMTH will notify Underground Service Alert so that approximate locations of underground utility lines and structures can be marked The soil borings will be started by hand-angering or probing to a depth of 3 to 5 feet to minimize the possibility of damaging underground utilities The boring will be drilled with a CME 55 or similar drill ng equipped with continuous-flight, hollow-stem augers The augers will be steam-cleaned before and after use on the site The drill cuttings will be stored in Department of Transportation (DOT) 55-gallon drums or stockpiled onsite and covered with plastic pending appropriate disposal • 1500751QUARTLYIFLDMTHDS doe 2