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Patricia Bonnifield Page 4 October 20, 2003 <br />Therefore, any soil eroding from the site would likely accumulate at the bottom of the depression <br />caused by the sandblast compound rather than reaching the surface water. Thus, potential <br />impacts on surface water and sediment are considered incomplete. <br />Conclusions and Recommendations <br />Based on the above-described results it is our professional opinion that no hazardous waste is <br />present within the sandblast compound or in the vicinity of the sandblast compound. It is also <br />our professional opinion that the existing site conditions do not pose a health threat or an <br />environmental threat to surface water, groundwater, or any aquatic habitat in the vicinity of the <br />sandblast area. We are have been informed that the future site development plans call for the <br />cessation of future sandblasting, and this entire area will be paved with a concrete surface. The <br />paving of the entire area will prevent any future exposure to the existing surface soil conditions. <br />It our professional opinion that no additional clean-up actions are warranted at this time, and that <br />there is no further need for any regulatory oversight for this issue. Copies of this report should <br />be sent to the SJCEHD and DTSC to seek release from all further regulatory oversight and case <br />closure. <br />If you have any questions or need additional information, please do not hesitate to call. <br />Sincerely, <br />SHAW ENVIRONMENTAL, INC. <br />J. C. Isham RG, CEG, CHG Barbara Marks, CIH <br />Geology Manager Senior Risk Assessment Specialist <br />Enclosures: Sketch 1 - Site Location Map <br />Sketch 2 — Sample Location Map <br />Table 1 — Sandblast Debris Testing — Pre Cleanup Results <br />Table 2 — Post Clean-up Confirmation Testing <br />Certified Analytical Results <br />CAWINDOWS\Temporary Internet Files\Content.IE5\UTCIOUZE\Ladd's Investigation Report[ I].doc <br />