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Mr. Ken Price • - 2 - • 26 July 2001 <br /> yard minimum volume. If OCC obtains field soil density measurements, then Geomatrix can <br /> apply the appropriate weight-to-volume conversion at the scale. As proposed in the RAP, if the <br /> verification sample shows that the soil exceeds target cleanup levels, it will be reprocessed. <br /> Target cleanup levels are presented in Geomatrix' Table 1, which is attached. Table 1 presents <br /> site-specific designated levels agreed to by Board staff, as conveyed to OCC in our 2 April 1999 <br /> letter. <br /> The excavated soil will be stored within the on-site warehouse until treated. If the volume of <br /> stockpiled soil exceeds the warehouse capacity, Geomatrix will store it on existing concrete pads <br /> and cover it, as Mr. Souther clarified in our conversation. Treated soil will be covered or <br /> sprinkled with water before it is returned to the excavation. <br /> Geomatrix proposes to verify removal of contaminants from the excavation by obtaining one <br /> sidewgil spmplc for every 50 linear feet of sidewall, and one sample for every 500 square feet of <br /> base area. We concur with this sampling strategy. <br /> OCC needs to contain stormwater on-site. Prior to the first rains, the site should be graded <br /> and/or bermed so that stormwater does not leave the site. <br /> The Soil Remediation Plan is approved subject to the following conditions: <br /> 1. To verify destruction of contaminants, OCC will obtain at least one composited soil sample <br /> consisting of four subsamples from each 100 cubic yards of soil processed. OCC will obtain <br /> each subsample from 25 cubic yards of treated soil. <br /> 2. All untreated stockpiled soil shall be stored on an impervious surface and covered to prevent <br /> wind and water dispersion. <br /> 3. By 15 October 2001, onsite drainage shall be configured to prevent stormwater from <br /> leaving the property. <br /> OCC intends to implement this RAP for soil remediation by 15 September 2001 as confirmed in <br /> our conversation. Accordingly, a summary report is due by 31 December 2001. We look <br /> forward to see'.1 <br /> ' the RAP for phytoremediation by 1 November 2001. If you have any <br /> que ions, you the <br /> co me at (916) 255-3080. <br /> AMY TERRELL <br /> Private Sites Cleanup Unit <br /> encl. <br /> cc list: see next page <br />