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` GEOCHECK - PHYSICAL SETTING SOURCE SUMMARY GROUNDWATER FLOW DIRECTION INFORMATION ` Groundwater flow direction for a particular site is best determined by a qualified environmental professional using site-specific well data. If such data is not reasonably ascertainable, it may be necessary to rely on other sources of information,such as surface topographic information, hydrologic information, hydrogeologic data y collected on nearby properties,and regional groundwater flow information(from deep aquifers). TOPOGRAPHIC INFORMATION Surface topography may be indicative of the direction of surficial groundwater flow. This information can be used to assist the environmental professional in forming an opinion about the impact of nearby contaminated properties or, should contamination exist on the target property,what downgradient sites might be impacted. I USGS TOPOGRAPHIC MAP ASSOCIATED WITH THIS SITE Target Property: 2438121-82 LOCKEFORD,CA Source: USGS 7.5 min quad index j� GENERAL TOPOGRAPHIC GRADIENT AT TARGET PROPERTY Target Property: General SW LSource:General Topographic Gradient has been determined from the USGS 1 Degree Digital Elevation Model and should be evaluated on a relative (not an absolute)basis. Relative elevation information between sites of close proximity should be field verified. L HYDROLOGIC INFORMATION Surface water can act as a hydrologic barrier to groundwater flow. Such hydrologic information can be used to assist Lthe environmental professional in forming an opinion about the impact of nearby contaminated properties or,should contamination exist on the target property,what downgradient sites might be impacted. Refer to the Physical Setting Source Map following this summary for hydrologic information (major waterways and bodies of water). FEMA FLOOD ZONE FEMA Flood Target Property County Electronic Data SAN JOAQUIN,CA YES-refer to the Overview Map and Detail Map Flood Plain Panel at Target Property: 06029901606/CBPP j` Additional Panels in search area: 0602990155A/CBPP 0602990165B/CBPP 0602990170B/CBPP r. NATIONAL WETLAND INVENTORY NWI Electronic NWI Quad at Target Property Data Coverage LOCKEFORD Not Available HYDROGEOLOGIC INFORMATION Hydrogeologic information obtained by installation of wells on a specific site can often be an indicator of groundwater flow direction in the immediate area. Such hydrogeologic information can be used to assist the environmental professional in forming an opinion about the impact of nearby contaminated properties or,should contamination exist on the target property,what downgradient sites might be impacted. i V TC0692645.3r Page A-2 V