Identifier: groundwaterinhar00greg (find matches)
Title: Ground water in the Hartford, Stamford, Salisbury, Willimantic and Saybrook areas, Connecticut
Year: 1916 (1910s)
Authors: Gregory, Herbert E. (Herbert Ernest), 1869-1952 Ellis, Arthur Jackson, 1885- joint author State Geological and Natural History Survey of Connecticut
Subjects: Water-supply
Publisher: Washington, Govt. Print. Off.
Contributing Library: The Library of Congress
Digitizing Sponsor: The Library of Congress

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are used for the manufacture of brick in the southwesternand in the northern parts of the city. West of the clay deposits therock is covered principally with sand containing lenses of clay,ranging in thickness, according to the contour of the rock floor, froma mere film to 30 or 40 feet. The occurrence of ground water in areasof stratified deposits is discussed on page 15. Alluvium.—Near the middle of the eastern boundary of HartfordConnecticut River closely approaches the rock wall, but north andsouth of this place the channel swings to the east and the rock valleyis filled with drift and alluvium. In a number of test borings madethrough the valley fill near the northeast corner of the city by theHartford water department, samples of the rock penetrated weretaken at intervals of 5 feet, from wliich the following log wascompiled. The first 35 feet of this section is alluvium, the under-lying 40 feet of clay is believed to be a lacustrine deposit, and thelast 5 feet is probably till.
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HAKTFOED. 49 Log of test ivells near northeast corner of Hartford. Depth in feet. Fine silt, chiefly sand; some clay -with very fine flakes of mica 5 Same as above but larger percentage of clay 10 Same, except larger percentage of sand 15 Do 20 Do 25 Do 30 One-half sand and one-half reddish clay; sand is about 30 per cent mica - 35 Clay, reddish color 40 Do 45 Do 50 Do 65 Do 70 Do 75 Do 80 One-half reddish clay and one-half sand with a little mica 85 Very fine grained red sand (sandstone powder) 86 SURFACE-WATER SUPPLIES. The surface waters in Hartford are not used for public supplies,principally because tbey are bigbly polluted. The only water avail-able in considerable quantity is that of Connecticut River. Since1867 this water has been used by the public system on only a fewoccasions when, as a result of drought, the quantity in the reservoirbecame inadequate. The last of these occasions was in the summer.of 1900, when the water was distributed without filtration or germi-cidal tre

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