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Getty Task 2 Page T March 1, 1983 <br />r <br />L <br />L <br />Structure contoar maps far the bottom of the marine shale which bounds <br />the top of the overburden aquifer were not available for the entire study <br />area. CYCC personnel provided a structure contour map for this unit is the <br />vicinity of the Tieken lease and it was utilized to obtain upper confining <br />layer elevations in this area. In addition, CYCC personnel provided <br />elevations of this aait for all cells completed in the overburden aquifer. <br />These data were need to construct structure maps from which the grid values <br />were determined. Because of the relatively wide spacing of these wells, a <br />good deal of judgement was utilized in constructing these maps. Since the <br />thickness of the overburden aquifer is relatively constant, based oa available <br />drill hole data, errors is constructing this data set for the model should be <br />small, even though much interpretation and extrapolation were necessary. <br />3.2 Hvdroloaic Data <br />Hydrologic data required by the model includes the following aquifer <br />parameters: <br />1. aquifer piezometric head elevations <br />2. aquifer storage coefficient and apparent specific yield <br />3. aquifer permeability (hydraulic conductivity) <br />4. aquifer recharge and discharge data. <br />Aquifer storage coefficient and hydraulic conductivity were obtained by <br />CYCC personnel and others for a number of wells completed is the Wadge <br />Overburden aquifer. Several of these tests were described in the Task 1 <br />report and will not be repeated here. Since the Task 1 report was completed, <br />however, CYCC personnel have performed additional aquifer tests in the <br />Tweatymile Park area. These tests are briefly described is the following: <br />Well Number 021-82-47A: The piezomctric head of this well is <br />located above ground surface thereby allowing a constant <br />drawdown, variable discharge test to be performed. Such a test <br />wns performed by CYCC personnel on Oct. 18, 19ffi. A pressure <br />gauge snd valve were installed oa the well head and the well <br />was allowed to stabilize. The valve was then opened, creating <br />a constant drawdown boundary, and discharge was measured as a <br />function of time. Lohman (1972) presents a method by which <br />treasmissivity and storage coeficient can be calculated during <br />constant drawdown tests. Dpoa completion of the flow portion <br />of the test, pressures were monitored as the well recovered. <br />The hydraulic conductivity end storage coefficient obtained <br />from the flow portion of the test were 0.077 ft/day end <br />• <br />• <br />• <br />`- <br />~~ <br />