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GEOCHECI-,', - PHYSICAL SETTING SOURCE SUMMARY <br /> GROUNDWATER FLOW DIRECTION INFORMATION <br /> Groundwater flow direction for a particular site is best determined by a qualified environmental professional <br /> using site-specific well data. If such data is not reasonably ascertainable,it may be necessary to rely on other <br /> sources of information, such as surface topographic information,hydrologic information, hydrogeologic data <br /> collected on nearby properties,and regional groundwater flow information(from deep aquifers). <br /> TOPOGRAPHIC INFORMATION <br /> Surface topography may be indicative of the direction of surficial groundwater flow. This information can be used to <br /> assist the environmental professional in forming an opinion about the impact of nearby contaminated properties or, <br /> should contamination exist on the target property,what downgradient sites might be impacted. <br /> TARGET PROPERTY TOPOGRAPHY <br /> USGS Topographic Map: 38121-1314 THORNTON,CA <br /> General Topographic Gradient: Undeterminable <br /> Source: USGS 7.5 min quad index <br /> SURROUNDING TOPOGRAPHY: ELEVATION PROFILES <br /> r <br /> c <br /> 0 <br /> North South <br /> TP <br /> .r <br /> 0 <br /> m <br /> w <br /> West East <br /> TP <br /> 0 1/2 1 Miles <br /> Target Property Elevation: 0 ft. <br /> ` Source:Topography has been determined from the USGS 7.5' Digital Elevation Model and should be evaluated <br /> on a relative(not an absolute)basis. Relative elevation information between sites of close proximity <br /> should be field verified. <br /> TC1599814.2s Page A-2 <br />