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<br />TASK 2. Geophysical logs from water, oil, orgas wells will be used to map the \. <br />subsurface structure of the deeper bedrock aquifers in the area. Structure maps will aid in mapping the .A <br />outcrop and subcrop of the bedrock aquifers where surface recharge and inter-aquifer flow of ground ., <br />water can occur between the bedrock and surfical aquifers. <br /> <br />TASK 3. Water-quality analyses from shallow wells will be used to define the chemical <br />characteristics of the shallow ground-water in the area. <br /> <br />PREVIOUS PROGRESS: TASK 1. A bibliography of 144 reports pertaining to the geology and water <br />resources of the shallow and bedrock aquifers in the demonstration area has been compiled. Lithologic- <br />logs and water-level data have been compiled for about 17,000 wells and test holes in the area. About <br />6,000 of these wells were used to define the thickness of the unconsolidated sediments, altitude of the <br />bedrock surface, altitude of the water table, depth to water, and saturated thickness of the shallow <br />aquifers in the 680 square mile Denver metropolitan area. This work covers the southem 1/3 of the <br />demonstration area, and has been published as Hydrologic Investigations Atlas HA-736. <br /> <br />Data compilation activities have been completed in the northem 2/3 of the demonstration area. <br />Compilation and quality checking of lithologic and water-level data has been completed. Contour maps <br />of the thickness of the unconsolidated sediments have been prepared. Contouring of the water-table <br />altitude has begun <br /> <br />TASK 2. Geophysical logs from about 1700 wells have. been interpreted and <br />used to map the subsurface structure of the base or top of the Laramie-Fox Hills or Arapahoe aquifers. <br />The mapped area is along the westem margin of the Denver Basin from Nunn to Larkspur, Co. <br />Preliminary mapping of the outcrop of the bedrock aquifers and the subcrop of the aqUifers under <br />principal alluvial aquifers has been completed. The digital data base of bedrock-aquifer altitudes has .A <br />been completed. A draft final report for TASK 2 has been prepared, reviewed, and sent to Central ., <br />Region for Director's approval. GIS processing of the final illustrations is near completion. <br /> <br />TASK 3. Water-quality for about 5,000 shallow wells have been compiled. <br />Additional data is awaiting compilation. <br /> <br />PROGRESS THIS QUARTER-Project remains on schedule <br /> <br />TASK 3. No significant progress has been made on the water-quality data base this <br /> <br />quarter. <br /> <br />PROGRESS THIS QUARTER - Project remains on schedule <br /> <br />TASK 1. Mapping in the northem 2/3 of the demonstration area has been undertaken at <br />the 1 :24,000 scale of topographic quadrangles. Forty five quadrangles are within the area. A series of <br />270 1 :24,000 scale maps have been prepared to show geohydrologic conditions on the 45 quadrangles. <br />The 270 maps have been scanned to produce ArclNFO coverages consisting of 8 themes: <br />1. Extent of the study area <br />2. Areas of bedrock outcrop <br />3. Location of data points indicating thickness of unconsolidated sediments <br />4. Attributted contours on the thickness of the unconsolidated sediments <br />5. Location of data points indicating water-table altitude <br />6. Attributted contours on the water-table altitude. <br />7. Unattributted contours on the water-table altitude. <br />8. Arrows indicating the direction of ground-water movement. <br /> <br />e <br />