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w � <br /> i <br /> July 21, 1993 Working To Restore Nature <br /> Fire Engine Company No 2, Stockton, California <br /> Sample Labeling and Handling <br /> Sample containers will be labeled in the field with the job number, sample location, depth, <br /> date, and promptly placed in iced storage for transport to the laboratory A Chain of <br /> Custody Record will be initiated by our representative and updated throughout handling of <br /> the samples and accompanied the samples to a laboratory certified by the State of California <br /> for the analyses requested Samples will be transported to the laboratory promptly to help <br /> ensure that recommended sample holding times are not exceeded Samples in our custody <br /> will be properly disposed of after their useful life has expired <br /> Disposal of Soil and Water <br /> Soil cuttings generated during drilling will be stored onsite and covered with plastic sheeting <br /> If possible, drill cuttings exhibiting subjective evidence of gasoline hydrocarbons or <br /> producing a positive response on the photoionization detector will be separated from those <br /> drill cuttings evaluated as having no gasoline hydrocarbons Purge water will be stored in <br /> 55-gallon drums approved by the Department of Transportation until suitable disposal <br /> options can be selected based on laboratory analysis We will evaluate disposal options of <br /> soil and water, and apprise the client of those options <br /> Evaluating the Groundwater Flow Direction and Gradient <br /> The elevations and positions ("x" and "y" lateral coordinates) of the momtonng well will be <br /> surveyed by a licensed land surveyor with respect to a local datum that references the <br /> elevation according to mean sea level. The elevation of the monitoring wells will be <br /> measured within 0 01 foot of the local datum The horizontal distances will be measured <br /> to the nearest 01 foot The elevations will be taken to either a notch or an arrow to be <br /> marked on the top edge of the well casing <br /> The groundwater elevation for each monitoring well is calculated by subtracting the depth <br /> to water from the wellhead elevation The groundwater elevation information is used to <br /> construct a potentiometric surface map, which will be used to evaluate the direction of <br /> groundwater flow and the magnitude of the groundwater gradient <br /> 3aoo>-9w A-4 <br />