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` GEOCHECFC""' - 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 /> r. 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: Strafrfed 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.Bavv ec,Geology <br /> ,r 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 /> TC1626703.1s Page A-4 <br />