Laserfiche WebLink
I <br /> Working to Restore Nature <br /> I <br /> 4L3 Groundwater Gradient <br /> During drilling, groundwater was encountered at approximately 61 to 68 5 feet bsg From <br /> f <br /> October 1991 to November 1993, static water levels have fluctuated from approximately 60 5 <br /> to 66 feet bsg The variations in depth to water in the wells are due to seasonal <br /> fluctuations Because groundwater has been measured as high as 605 feet bsg in the <br /> i monitoring wells (well MW-1, March 31, 1992), the top of the capillary fringe may have <br /> been less than 60 feet bsg during 1992 Depth to water measurements are shown on Table <br /> 1 <br /> Using the groundwater elevations from January 11, 1992 and November 29, 1993, we <br /> evaluated the groundwater gradient and direction of groundwater flow The direction of <br /> groundwater flow varied from the northeast to southeast with a gradient of 0 001 to 0 002, <br /> respectively The groundwater flow direction has fluctuated from northeast to southeast to <br /> east since January 1992 <br /> 5.0 PROPOSED SOIL AND GROUNDWATER REMEDIATION SYSTEMS <br /> The proposed soil and groundwater remediation systems will consist of combined vapor <br /> extraction and air sparging systems which will be used to remediate soil and groundwater <br /> beneath the site Upon installation and operation of the systems, we will assess the <br /> adequacy of the systems to remediate soil and groundwater to acceptable regulatory levels <br /> for closure The installation of additional vapor extraction wells or air sparging wells may <br /> be necessary in the future, depending on site-specific conditions <br /> 30003-13 8 <br />