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APPENDIX B ' GROUNDWATER SAMPLING AND ANALYSIS PROCEDURES Subjective Analysis of Monitoring Wells ' were collected for subjective analysis from just below the air-fluid interface Groundwater samples J Y in the monitoring wells by lowering approximately half the length of a clean Teflon bailer through the interface The bailer was retrieved and the water sample examined for floating product, sheen, ' or other subjective evidence of hydrocarbons Measurement of the Depth to Groundwater in Monitoring Wells The depth of the groundwater surface in the monitoring wells was measured from the top of the well casing to the nearest 0 01 foot with a Solinse water level indicator Groundwater Sampling The static water level in each well was measured to the nearest 0 01 foot with a Solinst electric water level indicator cleaned with a laboratory-grade, non-phosphatic detergent and deiomzed water before use in each well A clean bailer was used to obtain a sample from the surface of the water in the well for a subjective analysis of hydrocarbons The sample was retrieved and visually examined for floating product, sheen, color, and clarity Approximately three casing volumes of groundwater were purged from the wells using a stainless-steel, electrical, submersible pump The pump, cables, and hoses were cleaned with a laboratory-grade, non-phosphatic detergent and water before use in each well The wells were purged until withdrawal was of sufficient duration to result in stabilized pH, temperature, and electrical conductivity of the water, as measured by portable meters calibrated to a standard buffer and conductivity standard The wells recovered to more than 90 percent of the static water level within 5 minutes of turning off the pump 11SACRFPIICOMMON1sacDP120031Prf188018800391A 3aa doe Shaw Environmental,Inc (01050000) B-1