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GEOCHECW - 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 geologlcTand soil strata data It 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 sal <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 /> 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 /> n <br /> L ROCK STRATIGRAPHIC UNIT _ GEOLOGIC AGE IDENTIFICATION <br /> Era Cenozoic Category Stratifed Sequence <br /> System Quaternary <br /> Series Quaternary <br /> Code 0 (decoded above as Era System&Serres) <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 t <br /> Map, USGS Digital Data Series DDS- 11 (1994) <br /> a � r <br /> i <br /> 'r <br /> z <br /> TC01640841 it Page 4 <br /> r <br />