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0 Carollo Engineers GRG November 21, 2006(Project No. 3045.036) The annular space around the slotted portion of the wells will be backfilled with No. 3 sand. The sand will extend to 0.5 feet to 1 foot above the slotted well screen. A 1-foot-thick bentonite seal will be placed above the sand pack. The upper portion of the annular space will be backfilled with cement grout. The driller will provide locking caps for each well. The driller will construct the monitoring well in the shallow groundwater that has a low permeability. The No. 3 sand will filter the fine grain sediments from entering the wells. Yet, the No. 3 sand is coarse enough to allow groundwater to flow readily into the well. The slot size 0.020 will also filter the fine grain sediments and is yet coarse enough to allow water to flow into the monitoring well. The driller will place approximately 1 foot of bentonite pellets over the sand and hydrate the bentonite using distilled water. The driller will then place a neat cement grout over the bentonite and will secure the well with a locking well cap and traffic-rated well cover that rests flush with the ground surface. Fugro will place stake with flagging around each of the monitoring well to alert the construction crews to the locations of the wells. 1.3 EQUIPMENT DECONTAMINATION PROCEDURES The driller will use detergent solution to clean all sampling equipment between each sample. Augers will be pressure washed before and after each use. 1.4 HEALTH AND SAFETY PLAN Fugro has prepared a preliminary health and safety plan (H&SP) for all Fugro employees who will work at DVI. The H&SP includes a discussion of the chemicals known to be present at the site, the potential dangers in working with these chemicals that may be present in the soil and groundwater, and the potential dangers in working with the drilling and well development equipment. The H&SP includes a map that shows the location of the nearest hospital and written directions from the site to the hospital. We present the preliminary H&SP in Appendix A. The drilling contractor will prepare his own H&SP. 1.5 TOPOGRAPHIC MAP The topographic map, Plate 1, shows the proposed drilling sites for the three monitoring wells and the approximate locations of four existing water supply wells at DVI. We are aware of no waste handling facilities, or utilities in the vicinity of the proposed locations of the three monitoring wells. On a larger scale, Plate 2 shows the Class II brine ponds, the locations of the three monitoring wells, the dirt road, and the access roadways that bound the brine ponds. cvoeooCSQa50NSO FIMn DOCSIaar.rNOVM DOC 2