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1 <br /> SITE CLOSURE REPORT <br /> General MiUs, Inc <br /> 20W West Turner Road <br /> Lodi, California <br /> Delta PmJect No D092-708 <br /> Page 10 <br /> No analyte has been reported in ground water samples from any monitoring wells during any <br />' sampling event, <br /> Over 98 percent of the estimated hydrocarbons in soil have been removed by excavation, <br />' . Using a worst case calculation, approximately 0 75 gallons of fuel oil is estimated to remain <br /> in place in soil <br /> Hydrocarbon containing sort appears to be limited to a three foot layer beneath the former <br /> tank cavity from 15 to 18 feet bsg and is a low mobil fuel oil, <br /> Hydrocarbons are not present below 20 feet bsg at detectable levels and based on the <br /> County's letter dated April 28, 1994, "up to 100 ppm TPH-diesel could be left in place at <br /> 25 feet below grade without posing a threat to ground water", <br /> 1 <br /> Additional excavation to remove approximately 0 75 gallons of fuel oil is not cost effective <br /> idue to the proximity of adjacent structures and the estimated quantity of fuel oil remaining <br /> in place, <br /> 1 <br /> The previously prepared General Risk Appraisal indicates that the hydrocarbons remaining <br /> iin place do not pose a threat to ground water quality <br /> iFor these reasons, it is Delta's opinion that regulatory closure should be granted for this site, the existing <br /> ground water monitoring wells should be destroyed, and no further investigation or remediation should <br /> ibe required It is Delta's Understanding that General Mills has assumed that regulatory closure will be <br /> granted, and does not plan further monitoring at the site <br /> i <br />' RPT137 3JS <br />