Laserfiche WebLink
' Mapping and analysis of the groundwater elevation data suggested <br /> that the local groundwater gradient flowed in a northeasterly <br />' direction <br /> 5. 0 GROUNDWATER SAMPLING <br />' Groundwater samples were collected on October 24 , 2001 . Depth- <br /> to-groundwater was measured using an electric water level meter <br />' prior to groundwater sampling activities . Groundwater sampling <br /> involved bailing approximately three well casing volumes of water <br /> out of the wells prior to sampling Parameters such as water <br />' clarity, pH, temperature, specific conductance, and volume <br /> extracted were measured during purging (Appendix B) . The wells <br /> were bailed near-continuously until all stagnant water was <br /> removed <br /> Groundwater samples were collected manually (hand-bailed) using a <br /> Teflon bailer from each monitoring well The samples were <br /> ' transferred into 500-m1 plastic bottles with a Teflon septa. The <br /> samples were filtered in the field and preserved with nitric <br /> acid The samples were stored in a chilled cooler containing <br /> crushed ice to maintain the sample at 4°C for delivery to the <br /> laboratory Strict chain-of-custody protocols were followed in <br /> all phases of sample handling <br /> ' All equipment used during the sampling activities which came in <br /> contact with contaminated material were thoroughly decontaminated <br /> before and after each use. This was accomplished by washing with <br /> ' Alconox (a laboratory-grade detergent) and rinsing with distilled <br /> water <br /> ' 6.0 GROUNDWATER ELEVATION AND FLOW <br /> The elevation of the groundwater surface (potentiometric surface) <br /> ' was measured for each monitoring well to evaluate the direction <br /> of groundwater flow at the Site Groundwater level measurements <br /> were recorded using an electronic water-level probe attached to <br /> an engineer' s measuring tape graduated to 0 01-foot intervals <br /> Measurements were recorded from the top of the groundwater <br /> surface to the top of the well casing The difference between <br /> the top of the well casing elevation and the depth to the top of <br /> the groundwater surface is a measurement of the potentiometric <br /> surface of the groundwater table <br /> Measured depth to groundwater levels at the Site ranged from <br /> } -6 34 feet (MW-2) to -6 37 feet (MW-3 ) above mean sea level . <br /> 3 <br /> 1 <br />