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r, r <br /> APPENDIX A <br />' SAMPLING AND ANALYSIS PROCEDURES <br /> Subjective Analysis of Monitoring Wells <br />' Groundwater samples were collected for subjective analysis from lust below the air-fluid interface <br /> in the monitoring wells by lowering approximately half the length of a clean Teflon bailer through <br />' the interface The bailer was retrieved and the water sample examined for floating product, sheen, <br /> 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 the <br /> well casing to the nearest 0 01 foot with a Sollnst water level indicator <br /> Groundwater Sampling <br />' The static water level in each well was measured to the nearest 0 01 foot with a Solinst electric <br /> water level indicator cleaned with a laboratory-grade, non-phosphatic detergent and deionlzed water <br /> before use in each well A clean bailer was used to obtain a sample from the surface of the water in <br /> the well for a subjective analysis of hydrocarbons The sample was retrieved and visually examined <br /> 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 />' purged until withdrawal was of sufficient duration to result in stabilized pH, temperature, and <br /> electrical conductivity of the water, as measured by portable meters calibrated to a standard buffer <br /> and conductivity standard The wells recovered to more than 90 percent of the static water level <br /> within 5 minutes of turning off the pump The groundwater purged from the wells was temporarily <br /> stored in 17E, steel, 55-gallon liquid waste drums approved for this use by the Department of <br /> Transportation <br /> CPMSACRFPIICOMMON\CamPk\Data\QMRlOthers\STKNQ100 doe-98Usg 1 IT Corporation <br /> A-1 <br />