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'r <br /> a33 <br /> RECOMMENDATION AND PROPOSAL <br /> 1, Without additional investigation, it is recommended that A. <br /> Teichert & Son excavate the tank area to a depth of 25' (or <br /> 2± feet into the clay layer at 23 feet deep) and store the <br /> material for aeration on site. <br /> 2. Test bottom and sidewells of excavation to assure total <br /> removal 'of contaminated materials. <br /> 3. If tests at bottom of excavation confirms deeper penetration <br /> of contaminates, continue excavation until bottom is free <br /> of contaminated materials. <br /> 4 . If test at bottom of excavation <br /> confirms that it is free of <br /> contaminated materials, <br /> 5. Apply to San Joaquin Air pollution Control District for <br /> aeration permit. <br /> .. 3 <br /> 7 <br />