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1 <br /> GEOCHECK D- PHYSIC-AL SE-TING SOURCE ADDENDUM <br /> • <br /> I � <br /> TARGET PROPERTY ADDRESS <br /> SBC-TRACY <br /> 10 EAST 12TH STREET <br /> TRACY,CA 95376 <br /> TARGET PROPERTY COORDINATES <br /> Latitude(North) 37 740700-37 44'26 5" <br /> Longitude(West) 121 425499-121'25 31 8 <br /> Universal Tranverse Mercator Zone 10 <br /> UTM X(Meters) 6387301 <br /> UTM Y(Meters) 4178007 8 <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 /> 1 <br /> TC945756 4s Page A 1 <br />