ARCHIVED REPORTS XR0012561 - Laserfiche WebLink

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April 7, 1992 ARCO Station No. 2168, Stockton, California from the wells will be stored in labeled., 55-gallon, steel drums approved for this use by the Department of Transportation until suitable disposal options can be selected based on laboratory analysis. Dispopi of drums and purge water is the responsibility of ARCO. The wells will be allowed to recover to at least 80 percent of static conditions, and a sample of the formation water will be collected with a Teflon bailer cleaned with a laboratory-grade detergent and deionized water. The water will be transferred slowly from the bailer to laboratory-cleaned, I-liter amber bottles and 40-milliliter glass vials for analyses by the laboratory. The glass vials will contain hydrochloric acid as a preservative. our geologist will check to see if headspace is present' If headspace is present, we will collect more samples until a headspace is absent. Chain of Custody Records will be initiated in the field by the geologist, updated throughout handling of the samples, wadi sent along with the samples to the laboratory. Copies of Chain of Custody Records will be included our final in report. Qradient Evaluation The local ground-water gradient will be.evaluated to provide an indication of the direction of ground-water flow at the site. 'rhe elevation of the top of each well casing will be measured relative to mean sea level by a licensed land surveyor. Water-depth measurements will be made to the nearest 0.01 foot in each well with an electric water-level indicator. The well will be vented to the atmosphere for a minimum of I hour before obtaining depth-to-water measurements. Venting is conducted to allow the ground water to equilibrate to barometric pressure. T,,;.3 data will be combined to evaluate the elevation of the ground-water surface in each well and the slope of the ground-water surface across the site. 31009-4W