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Figure lA shows the location of the site investigation area. r~r im upon the amount of <br />' work required, one or more test pits will be excavated in the area. One pit will ret;uire a <br />dozer to rn-o~ a bench for the backhoe. However, as stated above topsoil will be salvaged <br />nom the area prior to ~~cing bench construction or pit excavation. The bench and pit <br />ill be backfilled when no longer needed. The pit areas will be backfilled and the topsoil <br />will be redistributed aryl seeded with the rargelard seed mixture. Drainage frmn the area is <br />controlled by Pond D. <br />Ditch D-1 will be te~ararily rerouted in fr®n of the lobe facility to allow for better <br />working condition. After the site project has been completed it will be returned to its <br />original location. <br />In order to o~lete the site investigation a number of shallow monitoring wells were <br />installed to delineate the extent of diesel plume. In addition to the existing wells two <br />additional wells will be cm~leted in the area. The approximate location of the wells are <br />shown on Figure 10, Investigation Site Area. If required, additional holes may be drilled <br />and the wells constructed in them. <br />The wells will be drilled with a mobile auger rig, and as such, no road work is anticipated. <br />If a road is required the topsoil will be bladed to the side and temporarily stockpiled. <br />ter the work is o~q~leted the topsoil would be redistributed over the road. <br />The wells will range in depth from approximately 20-80 feet. The wells will be constructed <br />of 2 or 4 inch PVC. Normal monitoring aryl construction procedures will be used when the <br />wells are built, e.e. use of clean gravel pads, correctly sized screen, and surface plug. <br />When the wells are no longer needed the wells will be plugged with grout. The wells will be <br />cut off three feet below grade arri then grouted from the bottom up. Zhis plugging procedure <br />applies to all of the wells at the site. <br />Railroad <br />The railroad track was extended approximately 300 feet in 1987. The details of the extension <br />are enumerated within Minor Revision 87-12. <br />• <br />MR 90-71 Permit Renewal 780-30-3 Revised 07/30/91 <br />