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' Water level in TP-W1 has fluctuated since its completion <br />(table 2.04.7(1)-2). Three days after completion, the water <br />level stood-at 68'6" below the top of the PVC casing. A month <br />later, the water level was at 70' 9 1/4" just before the well was <br />evacuated using the airlift technique with N2 cylinders. After <br />overnight recovery, the water level rose 5 feet to a level of 65' <br />9 1/4% <br />The monitor well confirms the existence of a confined aquifer <br />just below the coal seam to be mined. The aquifer is laterally <br />extensive throughout the project area and it most likely extends <br />to the southeast of the area as far as the Caldirola No. 2 !line <br />where it contributes to the water reservoir in the mine. The <br />sustained yield of 6 gpm reported for the mine shaft well (United <br />Western Engineering, 1974) can thus be taken as the upper limit <br />for the sandstone aquifer at TP-W1. During the cleaning <br />operation of the open hole, discharge rate was estimated at not <br />. more than 2 gpm. <br />Recharge to the aquifer is mainly along the outcrops of the <br />sandstone bed to the northwest, east and southeast of the project <br />area. In the absence of another monitor hole completed in the <br />same aquifer as TP-W1 to determine direction of slope of the <br />ground-water table, it can only be assumed that flow direction is <br />towards the axis of the Chandler Syncline. Vertical movement is <br />unlikely because of the impervious shale beds that dominate the <br />sequence above the aquifer. <br />Monitor well TP-W1 was sampled twice within a month's <br />interval for water quality analyses. Values under TP-GW-1 in <br />table 2.04.7(1)-3 refer to these samples. The first sample was <br />taken following the completion of the well after over 30 gallons <br />of water had been bailed out using 1 1/2" by 4' bailer. The <br />second sample was taken after approximately three times the <br />volume of well storage had been evacuated using airlift pumping. <br />Sample waters were obtained using the bailer in both instances. <br />JFSA-38