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27 October 2010 <br /> AGE-NC Project No. 05-1256 <br /> Page 8 of 19 <br /> EHD sanitation permits from 1986 list an irrigation well in the field behind the <br /> currently vacant buildings; the field was utilized as a golf driving range (currently <br /> fallow). Additionally, one of the permits signed by an EHD representative, states the <br /> 'old well has been destroyed with cement.' Well not observed during <br /> reconnaissance. <br /> A search of the CVRWQCB GeoTracker Web Site did not reveal any sites/ground water <br /> monitoring wells within an approximate 2,000-foot radius of the site. <br /> On 20 October 2010, AGE representatives performed a reconnaissance of visually <br /> observable potential sensitive receptors located within an approximately 2,000-foot radius <br /> of the site. No receptors were identified during the reconnaissance. <br /> Copies of the well drillers' reports are included in Appendix G (not uploaded to <br /> GeoTracker). A summary of the water wells located from the sensitive receptor survey, is <br /> included in Table 7. Approximate/estimated locations of the wells are depicted on Figure <br /> 10. <br /> 8.0. SITE CONCEPTUAL MODEL <br /> A site conceptual model (SCM)identifies type and source(s)of contamination, determines <br /> extent of contamination, identifies dominant fate and transport characteristics including <br /> hydrogeology and potential exposure pathways at the site and identifies potential receptors <br /> and risk associated with contamination. The site has areas with residual soil and ground <br /> water contamination which have been previously described, as well as potential receptors. <br /> Physical measurements made over the course of the site investigation/remediation and <br /> chemical data through the analysis of excavation soil samples and samples collected from <br /> soil borings and ground water monitoring wells, provide structure for development of a site <br /> conceptual model for the release, migration and distribution of contaminants in the <br /> subsurface. <br /> NATURE AND OCCURRENCE OF CONTAMINATION <br /> Fuel oxygenate and petroleurn hydrocarbon mass distribution within the vadose zone is <br /> predominately present beneath the former and current dispenser area. Based on <br /> mass/volumetric estimates (Figures 5 and 6; Appendix C), the bulk of MTBE and TPH-g- <br /> impacted soil, approximately 142 pounds of MTBE and 6,147 pounds of TPH-g remain in <br /> shallow soils beneath the dispensers. This volume rernains above the upper level of static <br /> Advanced GeoEnvironmental,Inc. <br />