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r <br /> r <br /> r <br /> APPENDIX B <br /> GROUNDWATER SAMPLING AND ANALYSIS PROCEDURES <br /> 1 <br /> Subjective Analysis of Monitoring Wells <br /> Groundwater samples were collected for subjective analysis from just below the air-fluid <br /> interface in the monitoring wells by lowering approximately half the length of a clean Teflon° <br /> bailer through the interface The baiter was retrieved and the water sample examined for <br /> floating product, sheen, or other subjective evidence of hydrocarbons <br /> Measurement of the Depth to Groundwater in Monitoring Wells <br /> ' The depth of the groundwater surface in the monitoring wells was measured from the top of <br /> the well casing to the nearest 0 01 foot with a Sollnst water level indicator <br /> Groundwater Sampling <br /> p 9 <br /> rThe static water level 1n each well was measured to the nearest 0 01 foot with a Sohnst electric <br /> water level indicator cleaned with a laboratory-grade, non-phosphatic detergent and deionized <br /> water before use 1n each well A clean bailer was used to obtain a sample from the surface of <br /> rthe water in the well for a subjective analysis of hydrocarbons The sample was retneved and <br /> visually examined for floating product, sheen, color, and clarity <br /> Approximately three casing volumes of groundwater were purged from the wells using a <br /> stainless-steel, electrical, submersible pump The pump, cables, and hoses were cleaned with a <br /> laboratory-grade, non-phosphatic detergent and water before use in each well. The wells were <br /> rpurged until withdrawal was of sufficient duration to result in stabilized pH, temperature, and <br /> electrical conductivity of the water, as measured by portable meters cahbrated to a standard <br /> buffer and conductivity standard The wells recovered to more than 90 percent of the static <br /> water level within 5 minutes of turning off the pump The groundwater purged from the wells <br /> was temporarily stored in 17E, steel, 55-gallon liquid waste drums approved for this use by the <br /> ' Department of Transportation <br /> Before collecting each groundwater sample, the geologist cleaned the Teflon barer with a <br /> r laboratory-grade detergent and rinsed it with tap water and deionlzed water. Hydrochloric acid <br /> was added to the sample vials as a preservative. A sample of the formation water was then <br /> IT CORPORATIONSAC 1C\My Documents\MiscWon rodgers 1801 doe-OOut 1 <br /> (01010000) <br /> r <br />