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' GEOCHECW - 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 downgradaent sites might be impacted <br /> USGS TOPOGRAPHIC MAP ASSOCIATED WITH THIS SITE <br /> ' Target Property 2437121-G4 UNION ISLAND, CA <br /> Source USGS 7 5 min quad index <br /> GENERAL TOPOGRAPHIC GRADIENT AT TARGET PROPERTY <br /> Target Property General North <br /> Source General Topographic Gradient has been determined from the USGS Digital Elevation Model and <br /> should be evaluated on a relative(not an absolute)basis Relative elevation information between sites of <br /> ' close proximity should be field verified <br /> ' HYDROLOGIC INFORMATION <br /> Surface water can act as a hydrologic bamer to groundwater flow Such hydrologic information can be used to assist <br /> the environmental professional in forming an opinion about the impact of nearby contaminated properties or,should <br /> contamination exist on the target property,what downgradaent sites might be impacted <br /> Refer to the Physical Setting Source Map following this summary for hydrologic information(major waterways <br /> and bodies of water) <br /> ' FEMA FLOOD ZONE <br /> FEMA Flood <br /> Target Property County Electronic Data <br /> SAN JOAQUIN, CA YES-refer to the Overview Map and Detail Map <br /> ' Flood Plain Panel at Target Property 0603030005A <br /> Additional Panels in search area 06029905658 <br /> 1 06029905708 <br /> 0602990705A <br /> NATIONAL WETLAND INVENTORY <br /> NWI Electronic <br /> NWI Quad at Target Property Data Coverage <br /> UNION ISLAND YES-refer to the Overview Map and Detail Map <br /> ' HYDROGEOLOGIC INFORMATION <br /> Hydrogeologic information obtained by installation of wells on a specific site can often be an indicator <br /> of groundwater flow direction in the immediate area Such hydrogeologic information can be used to assist the <br /> ' environmental professional in forming an opinion about the impact of nearby contaminated properties or, should <br /> contamination exist on the target property,what downgradient sites might be impacted <br /> TC0961230 3s Page A-2 <br />