Eleven heavily used surficial-deposit aquifers in New York were mapped in 1981 to provide a basis for their protection from contamination, particularly through underground disposal of wastes. The resulting maps and sections, originally prepared and released by the U.S. Geological Survey at a scale of 1:24,000, are presented herein at a reduced scale and in simplified form. Each illustration is accompanied by a short text describing the major features and hydrologic characteristics of the given aquifer. The areas mapped are Schenectady,

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Water-level hydrograph of changes at Chugiak- .-21. Sketch map of Cordova showing well locations-_ _. 22. Hydrographs of water-level changes on the Kcnai Lowland. _.

A major fracture system in indurated sedimentary rocks forms a moderately extensive aquifer yielding 100-300 gallons per minute to wells 160 to 420 feet deep. Pumping-test data show that the fracture system is interconnected to distances more than 1,000 feet from the wells. Recharge occurs through overlying clayey till, and continuous pumping may induce recharge from surface-water sources. Partial chemical analyses indicate no water-quality problems. Systematic collection of data on pumpage, water level, and chemical quality could help to determine the long-term adequacy of the aquifer system.

Introduction ___________________________ 1 Previous studies ______________________ 2 Purpose and scope ____________________ 2 Hydrogeologic conditions ___________________ 3 Geology ___________________________ 3 Stratigraphy and lithology ____________ 4 Structure _______________________ 4 Seismicity ______________________ 5 Petroleum and natural-gas resources ______ 6 Subsurface hydrology ___________________ 6 Saline water _____________________ 6 Occurrence and characteristics _______ 6 Hydraulics ___________________ 7 Freshwater aquifers ________________ 8 Unconsolidated rock ______________ 8 Bedrock ____________________ 9 Confining beds ____________________ 9 Deep-well injection potential ________________ 9 General principles ____________________ 9 Existing injection wells _________________ 9 Brine disposal _____________________ 9 Acidic-waste disposal ________________ 9 FMC Corporation well ____________ 10 Hooker Chemical and Plastics Corporation well ______________ 10 Bethlehem Steel Corporation well ______ 10 Effects of injection test at Lackawanna site _______ 10 Hydrologic conditions of disposal unit _________ 10 Geologic conditions of disposal unit __________ 10 Canada 7S __ ..