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283 <br /> GEOCHEC 't - 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 /> 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&Series) <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 /> TC3968211.2s Page A-4 <br />