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1 <br />' GEOCHECK®- PHYSICAL SETTING SOURCE ADDENDUM <br /> TARGET PROPERTY ADDRESS <br />' FORMER EXXON RS 7-3942 <br /> 4444 NORTH PERSHING AVENUE <br /> STOCKTON, CA 95207 <br />' TARGET PROPERTY COORDINATES <br /> Latitude(North) 37 986801 -37'59' 12 5" <br />' Longitude(West) 121 320503- 121 19' 13 8" <br /> Universal Tranverse Mercator Zone 10 <br /> UTM X(Meters) 647490 9 <br /> UTM Y(Meters) 4205475 5 <br /> EDR's GeoCheck Physical Setting Source Addendum has been developed to assist the environmental professional <br /> with the collection of physical setting source information in accordance with ASTM 1527-00, Section 7 2 3 <br />' Section 7 2 3 requires that a current USGS 7 5 Minute Topographic Map(or equivalent, such as the USGS Digital <br /> Elevation Model)be reviewed It also requires that one or more additional physical setting sources be sought <br /> when(1)conditions have been identified in which hazardous substances or petroleum products are likely <br /> to migrate to or from the property,and (2) more information than is provided in the current USGS 7 5 Minute <br />' Topographic Map(or equivalent) is generally obtained, pursuant to local good commercial or customary practice, <br /> to assess the impact of migration of recognized environmental conditions in connection with the property Such <br /> additional physical setting sources generally include information about the topographic, hydrologic, hydrogeologic, <br /> and geologic characteristics of a site, and wells in the area <br /> lie <br /> Assessment of the impact of contaminant migration generally has two principle investigative components <br /> 1 Groundwater flow direction and <br /> 2 Groundwater flow velocity <br />' Groundwater flow direction may be impacted by surface topography, hydrology, hydrogeology,characteristics <br /> of the soil, and nearby wells Groundwater flow velocity is generally impacted by the nature of the geologic strata <br /> EDR's GeoCheck Physical Setting Source Addendum is provided to assist the environmental professional in <br />' forming an opinion about the impact of potential contaminant migration <br /> I <br /> • <br /> TC632290 1 s Page A-1 <br />