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GEOCHECK@- PHYSICAL SETTING SOURCE ADDENDUM TARGET PROPERTY ADDRESS PROPERTY AT SOUTH HANSEN ROAD 26955 SOUTH HANSEN ROAD TRACY,CA 95377 TARGET PROPERTY COORDINATES Latitude(North): 37.706394-37'42'23.V' Longitude (West): 121.512695- 121'30'45.T' Universal Tranverse Mercator: Zone 10 UTM X(Meters): 631107.3 UTM Y(Meters): 4174075.8 EDR's GeoCheck Physical Setting Source Addendum has been developed to assist the environmental professional with the collection of physical setting source information in accordance with ASTM 1527-00,Section 7.2.3. Section 7.2.3 requires that a current USGS 7.5 Minute Topographic Map(or equivalent,such as the USGS Digital Elevation Model)be reviewed. Il also requires that one or more additional physical setting sources be sought when(1)conditions have been identified in which hazardous substances or petroleum products are likely to migrate to or from the property,and(2) more information than is provided in the current USGS 7.5 Minute Topographic Map(or equivalent)is generally obtained,pursuant to local good commercial or customary practice, to assess the impact of migration of recognized environmental conditions in connection with the property.Such .— additional physical setting sources generally include information about the topographic,hydrologic,hydrogeologic, and geologic characteristics of a site,and wells in the area. Assessment of the impact of contaminant migration generally has two principle investigative components: 1.Groundwater flow direction,and 2.Groundwater flow velocity. Groundwater flow direction may be impacted by surface topography,hydrology,hydrogeology,characteristics of the soil,and nearby wells. Groundwater flow velocity is generally impacted by the nature of the geologic strata. EDR's GeoCheck Physical Setting Source Addendum is provided to assist the environmental professional in forming an opinion about the impact of potential contaminant migration. TC0954148.3s Page A-1 w