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GEOCHECK'"'- PHYSICAL SETTING SOURCE ADDENDUM <br />TARGET PROPERTY ADDRESS <br />CHARLES H ANDREWS <br />10195 E JAHANT RD <br />ACAMPO, CA 95220 <br />TARGET PROPERTY COORDINATES <br />Latitude (North): 38.204460 - 38" 12' 16.1" <br />Longitude (West): 121.193687 - 121' 11'37.3" <br />Universal Tranverse Mercator: Zone 10 <br />— UTM X (Meters): 658158.2 <br />UTM Y (Meters): 4229836.5 <br />Elevation: 93 ft. above sea level <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 />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 />— <br />— <br />TC01439514.2r Page A-1 <br />