Laserfiche WebLink
a. <br /> APPENDIX B <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 <br /> interface in the monitoring wells by lowering approximately half the length of a clean Teflon <br />' bailer through the interface The bailer 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 Sohnst water level indicator <br /> Groundwater Sampling <br />' The static water level in 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 detonized <br /> water before use in each well A clean bailer was used to obtain a sample from the surface of <br /> the water in the well for a subjective analysis of hydrocarbons The sample was retneved and <br /> visually examined for floating product, sheen, color, and clanty <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 <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 ternporanly stored in 17E, steel, 55-gallon liquid waste dnims approved for this use by the <br /> Department of Transportation <br /> tBefore collecting each groundwater sample, the geologist cleaned the Teflon barter with a <br /> laboratory-grade detergent and rinsed it with tap water and deiornzed water Hydrochloric acrd <br />' was added to the sample vials as a preservative A sample of the formation water was then <br /> . collected from the surface of the water in each of the wells with the Teflon bailer and slowly <br /> transferred to laboratory-cleaned sample containers <br /> CP\IISACRFPIICOMMOMConsultmg\data\Shared\Projeds\nusc18800391A.aa doo-98\1t 1 B-1 IT Corporation <br />