U.S. DEPARTMENT OF THE INTERIOR Prepared in cooperation with the SCIENTIFIC INVESTIGATIONS MAP 3136 U.S. GEOLOGICAL SURVEY NEW YORK STATE DEPARTMENT OF ENVIRONMENTAL CONSERVATION Saturated thickness of the surficial aquifer - SHEET 4 of 4 Reynolds, R.J., and Calef, F.J., III., 2010, Hydrogeologic data update for the stratified-drift aquifer in the Sprout and Fishkill Creek valleys, Dutchess County, New York 73°55' 73°50' 73°45' 41°45' 80˚ 79˚ 78˚ 77˚ 76˚ 75˚ 74˚ 73˚ 72˚ 45˚ CANADA 44˚ Lake Ontario VERMONT NEW 43˚ NEW YORK HAMPSHIRE Lake Erie MASSACHUSETTS 42˚ DUTCHESS COUNTY CONNECTICUT PENNSYLVANIA osg Study area 41˚ NEW 0 25 50 75 100 MILES JERSEY Atlantic 0 25 50 75 100 KILOMETERS Ocean osg t/r t/r EXPLANATION osg Saturated thickness of surficial aquifer, in feet t/r 0 to 10 0 to 10 ft osg 0 to 20 al 0 to 10 ft al 0 to 40 ksg 40 to 100 100 to 180 al ksg ksg Till or bedrock hill—surrounded by aquifer 0 to 20 ft osg Aquifer boundary—Denotes boundary between unconsolidated ksg deposits that comprise the Sprout and Fishkill Creeks aquifer and adjacent deposits of till and bedrock Limit of mapped area—Indicates arbitrary truncation of mapped area Surficial geologic boundary—Denotes boundary between adjacent ksg surficial geologic units. Surficial geologic units explained on Sheet 2 ksg al t/r t/r ksg Saturated Thickness of the Surficial Aquifer ksg col/ksg Sheet 4 shows the estimated saturated thickness of the surficial sand and gravel aquifer in the Sprout Creek-Fishkill Creek t/r study area. It is based on the previous map published in Moore and others (1982); however, two new ranges of saturated 0 to 20 ft thickness have been added. The estimated saturated thickness is based primarily on well logs from both domestic wells and test ksg holes in the expanded study area. The categories of saturated thickness represent estimates of the thickness of relatively highly permeable sediments extending from the water table downward to the top of the first major unit of low permeability, which may be either fine-grained lacustrine silt or clay, till, or bedrock. The unconsolidated surficial aquifer is composed of sediments 0 to 10 ft osg ranging from fine sand to coarse gravel, including some poorly sorted ice-contact material in the Shenandoah Moraine. In some ksg areas, deep confined sand and gravel aquifers may be present beneath thick confining units of lacustrine silt and clay; however, ksg al the available well data do not permit detailed mapping of these areas. The two new ranges, 0 to 10 feet and 0 to 20 feet, imply that the saturated thickness of the surficial aquifer in these areas is discontinuous and “spotty,” in part as a result of the presence t/r of isolated, partly buried kames, and therefore may range from 0 feet where no permeable material is present, to the upper end of 0 to 10 ft the range given, where permeable material is present at land surface. This is particularly true where valley areas are underlain by tl fine-grained lacustrine sediments, beneath which isolated buried kames, where present, may act as small localized aquifers. In al some areas where the saturated thickness is less than 10 feet, notably the Fishkill Creek flood plain north of the Shenandoah ksg Moraine, the valley is floored with thin deposits of lacustine silt and clay directly overlying till, with only isolated buried kame units comprising localized aquifers. In areas floored by outwash sand and gravel and post-glacial alluvium, the saturated t/r thickness in the tributary valleys can range from 40 to 100 feet, as in the wider Sprout Creek valley south of Freedom Plains, and t osg in the adjacent Whortlekill Creek north of Hopewell Junction. al 41°40' Summary t/r t/r The hydrogeology of the stratified-drift aquifer in the Sprout Creek and Fishkill Creek valleys in southern Dutchess County, New York, initially studied by Moore and others (1982), was updated primarily through the use of newly acquired well data made available through the New York State Department of Environmental Conservation’s Water Well Program. In addition, USEPA remedial investigations of two groundwater contamination sites near the villages of Hopewell Junction and Shenandoah, 0 to 40 ft al NY, contributed valuable well data used in this update. The boundary of the stratified-drift aquifer described in the original 1982 t/r t/r al tl USGS report (Moore and others, 1982) was extended slightly eastward and southward to include adjacent tributary valleys and al the USEPA groundwater contamination site at Shenandoah, NY. The new well data allowed for completion of the saturated- ksg thickness map in areas where well data previously had been insufficient. The updated report consists of four maps showing well ksg locations, surficial geology, altitude of the water table, and saturated thickness of the aquifer. GIS coverages of these four maps tl were created as part of the update process. ksg al Selected References osg t/r CDM Federal Programs Corporation, 2008, Final focused feasibility study report—Hopewell Precision Site, Hopewell Junction, 0 to 10 ft New York: CDM Federal Programs Corporation, 98 p. 0 to 20 ft t/r 40 to 100 ft alf Connally, G.G., 1980, Reconnaissance surficial geologic map of the Hopewell Junction 7.5-mi. quadrangle: New York State t/r Geological Survey Open-File report no. 2gk561, 1 sheet, 1:24,000. tl t/r al Connally, G.G., and Sirkin, L.A., 1986, Woodfordian ice margins, recessional events, and pollen stratigraphy of the mid-Hudson t/r valley, in Cadwell, D.H., ed., The Wisconsinan stage of the First Geological District, eastern New York: New York State Museum Bulletin no. 455, p. 50-72. ksg t/r Dana, J.D., 1872, Green Mountain geology—The quartzite of Poughquag, Dutchess County, New York: American Journal of t/r Science, Series 3, v. 3, p. 253-256. alf Dana, J.D., 1879, On the Hudson River age of the Taconic schists and on the dependent relations of the Dutchess County and 0 to 10 ft western Connecticut limestone belts: American Journal of Science, Series 3, v. 17, p. 375-388, and v. 18, p. 61-64. tl Dwight, W.B., 1887, Recent explorations in the Wappinger Valley limestones of Dutchess County, NY, no. 6: American Journal t/r tl of Science, Series 3, v. 34, p. 139-153. ksg t/r Fisher, D.W., 1968, Draft geologic map of the Hopewell Junction 7.5-min. quadrangle: New York State Geological Survey al Open-File report no. 1gG744, 3 sheets, 1:24,000. ksg osg Fisher, D.W., 1977, Correlation of the Hadrynian, Cambrian, and Ordovician rocks in New York State: New York State Museum and Chart Series no. 25, 75 p., 5 sheets. t/r Fluhr, T.W., 1931, Geology of the Fishkill area, New York—A report prepared for the Board of Water Supply, City of New York: New York State Geological Survey Open-File report no. 6mF302, 8 p. t/r t/r Gerber, R.G., 1982a, Reconnaissance surficial geologic map of the Hopewell Junction 7.5-min. quadrangle: Unpublished map on tl al file with the U.S. Geological Survey, Troy, NY, 1:24,000. tl t/r tl t/r Gerber, R.G., 1982b, Water resources study for Dutchess County: South Harpswell, Maine, Robert G. Gerber, Consulting Civil t/r osg al Engineer and Geologist, 20 p. 0 to 10 ft al Gordon, C.E., 1911, Geology of the Poughkeepsie Quadrangle: New York State Museum Bulletin No. 148, 121 p. Groundwater Sciences Corp., 2002, Shenandoah Road groundwater contamination Superfund site remedial t/r investigation/feasibility study work plan outline: Harrisburg, PA, Groundwater Sciences Corp., 100 p. 0 to 40 ft tl tl tl al Helenek, H.L., 1972, Bedrock geology of the Hopewell Junction, NY, 7.5-minute quadrangle—A preliminary report: New York tl State Geological Survey Open-File report no. 1g274, 13 p., 1 sheet, 1:24,000. t/r Holzwasser, F., 1926, Geology of Newburgh and vicinity: New York State Museum Bulletin no. 270, 95 p. t/r t/r t/r TACONIC PARKWAY STATE t/r Knopf, E.B., 1946, Stratigraphy of the lower Paleozoic rocks surrounding Stissing Mountain, Dutchess County, New York (abs.): t/r Geological Society of America Bulletin, v. 57, p. 1211-1212. t/r osg osg t/r al Moore, R.B., LaFleur, R.G., and others, 1982, Geohydrology of the valley-fill aquifer in the Sprout and Fishkill Creeks area, t/r Dutchess County, NY: U.S. Geological Survey Open-File Report 82-81, 6 sheets, 1:24,000. 0 to 40 ft tl tl tl al Offield, T.W., 1962, Geology reconnaissance maps, southern portion of the Hopewell Junction 7.5-minute quadrangle: New York tl 0 to 20 ft osg State Geological Survey Open-File report no. 1gB660, 2 sheets, 1:24,000. t/r ksg al osg Simmons, E.T., Grossman, I.G., and Heath, R.C., 1961, Ground-water resources of Dutchess County, New York: New York State t/r 41°35' Department of Conservation Bulletin GW-43, 82 p. osg tl t/r Snavely, D.S., 1980, Ground-water appraisal of the Fishkill-Beacon area, Dutchess County, New York: U.S. Geological Survey t/r Open-File Report 80-437, 14 p. t/r t/r t/r t/r tl Walcott, C.D., 1891, Overlap relations at the base of the Paleozoics in the northern Appalachians: Bulletin of the Geological t/r al Society of America, v.