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8. The gradation of Type 1 Filter will be tested after placement in <br /> accordance with ASTM D 422 at least once for every five-hundred <br /> cubic yards (500 cy) of material placed. <br /> 9. Fill placement will be tested by conducting at least one in-place <br /> density test in accordance with ASTM D 1556 for each fifteen- <br /> hundred (1,500) cubic yards of in-place material, or whenever, in <br /> the opinion of the Engineers, additional testing may be necessary. <br /> 10. The sand cone tests for in-place density (ASTM D 1556) will be <br /> supplemented by additional testing by indirect methods (nuclear <br /> testing in accordance with ASTM D 2922) at the discretion of the <br /> Engineer, but at a frequency on the order of one (1) test per ten- <br /> thousand (10,000) square feet of lift. <br /> SPEC.A - EARTHWORK <br /> PAGE 16 <br />