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• <br /> • <br /> • GEOCHECK"' - PHYSICAL SETTING SOURCE SUMMARY <br /> • GROUNDWATER FLOW VELOCITY INFORMATION <br /> • Groundwater flow velocity information for a particular site is best determined by a qualified environmental professional <br /> using site specific geologic and soil strata data. If such data are not reasonably ascertainable,it may be necessary <br /> • to rely on other sources of information, including geologic age identification, rock stratigraphic unit and soil <br /> • characteristics data collected on nearby properties and regional soil information. In general,contaminant plumes <br /> move more quickly through sandy-gravelly types of soils than silty-clayey types of soils. <br /> • <br /> • GEOLOGIC INFORMATION IN GENERAL AREA OF TARGET PROPERTY <br /> • Geologic information can be used by the environmental professional in forming an opinion about the relative speed <br /> • at which contaminant migration may be occurring. <br /> • ROCK STRATIGRAPHIC UNIT GEOLOGIC AGE IDENTIFICATION <br /> Era: Cenozoic Category: Stratifed Sequence <br /> • System: Quaternary <br /> • Series: Quaternary <br /> Code: Q (decoded above as Era,System&Senes) <br /> • Geologic Age and Rock Stratigraphic Unit Source: P.G.Schruben, R.E.Arndt and W.J. Bawiec, Geology <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 /> • Map,USGS Digital Data Series DDS- 11 (1994). <br /> • <br /> • <br /> • <br /> • <br /> • <br /> • <br /> • <br /> • <br /> • <br /> • <br /> • <br /> • <br /> • <br /> • <br /> w <br /> • <br /> • <br /> • <br /> • <br /> • TC2751145.2s Page A-4 <br /> • <br /> • <br />