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r <br /> r <br /> • <br /> r <br /> APPENDIX B <br /> GROUNDWATER SAMPLING AND ANALYSIS PROCEDURES <br />' Subjective Analysis of Monitoring Wells <br /> Groundwater samples were collected for subjective analysis from Just below the air-fluid interface in the <br /> monitoring wells by lowering approximately half the length of a clean Teflon® bailer through the interface <br /> The bailer was retrieved and the water sample examined for floating product, sheers, or other subjective <br /> 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 well casing to <br /> the nearest 0 01 foot with a Sohnsto water level indicator <br /> rGroundwater Sampling <br /> The static water level in each well was measured to the nearest 0 01 foot with a Solinst electric water level <br /> indicator cleaned with a laboratory-grade, non-phosphatic detergent and deionized water before use in each <br /> well A clean bailer was used to obtain a sample from the surface of the water in the well for a subjective <br /> analysis of hydrocarbons The sample was retrieved and visually examined for floating product, sheen,color, <br /> and clarity <br /> rApproximately three casing volumes of groundwater were purged from the wells using a stamless-steel, <br /> electrical, submersible pump The pump, cables, and hoses were cleaned with a laboratory-grade, <br /> non-phosphatic detergent and water before use in each well The wells were purged until withdrawal was of <br /> sufficient duration to result in stabilized pH, temperature, and electrical conductivity of the water, as <br /> measured by portable meters calibrated to a standard buffer and conductivity standard The wells recovered <br /> r to more than 90 percent of the static water level within 5 minutes of turning off the pump The groundwater <br /> purged from the wells was temporarily stored in 17E, steel, 55-gallon liquid waste drums approved for this <br />' use by the Department of Transportation <br /> 1 <br /> SACIIISACRFPIICOMMON1sacDP120021PRJ\PJ8188018800391A tae doe-001st I <br /> (01010000) <br /> B-1 <br />