Laserfiche WebLink
' The second phase of the FS process involves the screening of alternatives. Based on our <br /> understanding of site conditions (specifically, very shallow depth to groundwater), IT proposes to <br /> ' perform an aquifer test and a BioAssessment. The bioassessment will determine the feasibility <br /> of the enhancement of naturally occurring microbial ability to biodegrade the specific unwanted <br /> ' chemicals present in groundwater at the site. At the conclusion of laboratory bench studies. A <br /> small scale treatability study will be performed. This will consist of using the purge water <br /> ' generated from the groundwater well development and sampling and applying bioremediation to <br /> decrease contaminant levels. This will provide valuable information on field applications of the <br /> ' remediation process. <br /> ' The final phase of the FS process involves the detailed analysis of alternatives. During the <br /> detailed analysis, the alternatives brought through the screening are further refined so that <br /> ' decisions with respect to remedial actions can be made with sufficient information to compare <br /> alternatives and select an appropriate remedy. <br /> ' 2.2.1 Aquifer Testing <br /> Using an existing groundwater monitoring well, IT will conduct aquifer testing to determine <br /> ' hydraulic characteristics of the shallow aquifer zone. With an adjustable flow rate submersible <br /> pump, a step-discharge/drawdown test will be conducted to determine optimal pumping rate. <br /> 1 Following completion of the step-test, a constant rate pumping test will be conducted for up to <br /> eight hours. Groundwater levels in the pumping well and adjacent monitoring wells will be <br /> monitored with an electronic data logger and pressure transducers. The results of the aquifer test <br /> will be analyzed using a computer modeling program to determine aquifer characteristics and to <br /> ' evaluate the feasibility and cost of groundwater remediation. <br /> ' Groundwater generated during the test will be temporarily stored on site in a storage tank. The <br /> water will be characterized prior to discharge to the storm or sanitary sewer system. If <br /> t permission to discharge to the local sanitary sewer cannot be allowed, other disposal options, <br /> such as off site disposal will be pursued. <br /> ' 2.2.2 BioAssessment <br /> To determine if impacted soil and groundwater at the site can be remediated using <br /> ' bioremediation technology, background biological screening and biological feasibility testing <br /> ' 10 <br />