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FIELD METHODS Working To Restore Nature <br /> i <br /> Subjective Analyses <br /> The depth to ground water in the monitoring wells was measured to the nearest 0 01 foot <br /> with an electronic water-level indicator Samples of ground water were collected for <br /> subjective analysis from the air-fluid interface in each well by lowering approximately half <br /> the length of a clear Teflon bailer through the interface The bailer was retrieved, and the <br /> water sample was examined for free product, sheen, or other subjective evidence of <br /> hydrocarbons <br /> Pur in <br /> A minimum of 3 well volumes of ground water, corresponding to approximately 50 to 55 <br /> gallons, were purged from the wells using an electric submersible pump The purged water <br /> was placed into labeled 55-gallon 17-E drums approved for this use by the California <br /> Department of Transportation and stored temporarily onsite pending the results of <br /> laboratory analyses <br /> Ground-Water Samnlin <br /> Ground-water samples were collected after water in each well recovered to near its original <br /> level The ground-water samples were collected by lowering a clean Teflon bailer gently <br /> through the air-water interface to a depth approximately 3 feet below the ground-water <br /> surface The bailer was retrieved, and the samples were transferred slowly to laboratory- <br /> cleaned, 40-milliliter glass vials or other appropriate containers as required by the <br /> laboratory The vials and bottles contained hydrochloric acid and were filled so that no <br /> 1 headspace was left in the containers A Chain of Custody Record was initiated in the field <br /> and accompanied the samples to the analytical laboratory A copy of that record is attached <br /> to this letter report <br /> 1012mgue <br /> 3202o-1 <br />