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TC6499481.2s Page A-4 <br />Map, USGS Digital Data Series DDS - 11 (1994). <br />of the Conterminous U.S. at 1:2,500,000 Scale - a digital representation of the 1974 P.B. King and H.M. Beikman <br />Geologic Age and Rock Stratigraphic Unit Source: P.G. Schruben, R.E. Arndt and W.J. Bawiec, Geology <br />ROCK STRATIGRAPHIC UNIT GEOLOGIC AGE IDENTIFICATION <br />Stratifed SequenceCategory:CenozoicEra: <br />QuaternarySystem: <br />QuaternarySeries: <br />QCode: (decoded above as Era, System & Series) <br />at which contaminant migration may be occurring. <br />Geologic information can be used by the environmental professional in forming an opinion about the relative speed <br />GEOLOGIC INFORMATION IN GENERAL AREA OF TARGET PROPERTY <br />move more quickly through sandy-gravelly types of soils than silty-clayey types of soils. <br />characteristics data collected on nearby properties and regional soil information. In general, contaminant plumes <br />to rely on other sources of information, including geologic age identification, rock stratigraphic unit and soil <br />using site specific geologic and soil strata data. If such data are not reasonably ascertainable, it may be necessary <br />Groundwater flow velocity information for a particular site is best determined by a qualified environmental professional <br />GROUNDWATER FLOW VELOCITY INFORMATION <br />®GEOCHECK - PHYSICAL SETTING SOURCE SUMMARY®