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r <br /> Page 5 <br /> Geological Techfiks lits. <br /> City of Escalon <br /> Project No.: 750.2 <br /> r May 16,2005 <br /> The average depth to groundwater at the site suggests only Layer 4 will contain groundwater <br /> in a saturated state. The following calculations are based on the following equation: <br /> L <br /> v =Kiln <br /> where: <br /> v is the average horizontal groundwater velocity(AHGV) <br /> K is the average hydraulic conductivity <br /> i is the average hydraulic gradient, <br /> n is the effective porosity. <br /> K and n values are estimated from tables in Groundwater and Wells 2nd Edition (Driscoll, <br /> F.G., 1986). <br /> • The AHVG of Layer 1 is estimated to be approximately 0.065 to 6.5 ft/yr. <br /> • The AHVG of Layer 2 is estimated to be approximately 5.7 to 2,850 ftlyr. <br /> • The AHVG of Layer 3 is estimated to be approximately 5.6E104 to 0.057 ft/yr. <br /> • The AHVG of Layer 4 is estimated to be approximately 0.758 to 75.8 ft/yr. <br /> '-` 3.0 APPENDIX B SITE CLOSURE CHECKLIST <br /> J 3.1 Receptor Well Survey <br /> A sensitive receptor survey was performed in August of 2000 encompassing a 2000-foot <br /> radius around the site. The following conclusions are discussed in the Well Receptor Survey <br /> Report-November 14, 2000: <br /> • Two municipal wells (Escalon City Wells) were documented at distances greater than- <br /> 1,600 feet. <br /> • Escalon High School staff indicates that an irrigation well is present on the school, <br /> property,but domestic use is provided by municipal water supply. <br /> • Two DWR well logs are included for Fisk Avenue. The addresses of these <br /> residences' could not be confirmed, however all of the residences in the area are <br /> serviced by City of Escalon municipal water supply. If these two wells still exist, they <br /> are probably not used for drinking water purposes. <br /> 3.2 Non-Contamination Maps and Cross-Sections <br /> Figure 1: Vicinity Map-showing roads, highways and waterways adjacent to the property. <br /> Figure 2: Site Map - showing buildings, roads, lines of section, monitoring well locations, <br /> soil boring locations,former dispenser and former tank locations. <br /> -� Figure 3: West to East Lithological Cross-Section (A-A') - showing subsurface features <br /> and lithology. <br />