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c s Golden Grain Company January 11 , 1989 14 202/799-5045 .01 Proposed location 9, in the parking lot to the west of the S..a d railroad tracks, would consist of two nested wells, one screene in the sand below the clay confining layer, terminating at a depth of 50 feet, and one terminating in the clay layer and hydrogeology at this locatian screened in the upper sand. if the hY g gY wells, the differs significantly from that found in the exi- if no confin- well configuration would be adjusted accordingly. a single well terminating at ing clay was found, for instance, 20 feet below the water table would be installed, screened from 10 feet to total depth. Installing wells at this location would show if soil and a , water contamination extends northwest beyond the site, since the revious site water table maps have: regional County maps and some p sometimes indicated a northwest groundwater flow. The wells would also provide data that could be used to calculate the hydraulic gradients of both water zones, if present. be a single well installed inside Proposed location 10 would the warehouse through the floor, terminating in the confining layer or at 30 feet, whichever is reached first. Practical considerations involved in drilling inside the warehouse preclude r a deeper well here. This well would be a key data point in the defiliition of the northward extent of the free product and dissolved plumes in shallow soil and groundwater if not previously defined by location 12. Proposed location 11, across Grant Street installedeast ucholikethe wells warehouse, could contain a nest of two ld mwater those at proposed location 9, if necessary. Some previous table maps have sffown a...northeast groundwater..__f.lowgroundwater. direction 20