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r <br /> C A G 3 R A <br /> southwest to northeast into Yosemite Lake approximately 1,200 feet southeast of the site <br /> (Figure 1). <br /> Results: The only receptor identified within a 1/z-mile radius of the site is the Smith Canal <br /> approximately 1,200 feet southeast of the site. Because the Smith Canal is upgradient and a <br /> significant distance from the site, it is not likely to be impacted by previous activities at the <br /> subject site. <br /> Geophysical Survey <br /> Admilk <br /> On September 6, 2001, Norcal Geophysical Consultants, Inc. (Norcal) of Petaluma, California <br /> performed a geophysical survey to confirm that the former underground storage tanks (USTs) <br /> shown on Figure 2 were actually removed. Norcal's investigation consisted of metal detection, <br /> ground penetrating radar, and total field magnetic intensity surveys. Norcal could not conduct <br /> total field magnetic intensity surveys in the area behind the former station building due to the <br /> presence of hedges and underneath the canopy due to interference. These areas were <br /> investigated using both metal detection and ground penetrating radar. No evidence of any <br /> existing USTs remaining beneath the site was observed. The testing methods and results are <br /> discussed in greater detail in Norcal's report, which is included as Appendix 1. <br /> Recommendations <br /> As the USTs have been removed and there are no sensitive receptors likely to be impacted by <br /> previous site activities, Cambria recommends continuing the existing quarterly groundwater <br /> monitoring program for one year. Following the third quarter 2002 sampling event, Cambria will <br /> reassess the site and make further recommendations as necessary. <br /> 0943 2 <br />