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Construction Quality Assurance A)Plan Extension of Closure Cap <br /> Corral Hollow Sanitary Landfill August 21,2008 <br /> ♦ Observe that rade control con ru i <br /> gst ct on staking is performed prior to <br /> work and that the grades are in accordance with the construction <br /> drawings. <br /> ♦ Observe that angular or sharp rocks, rocks greater than 0.5-inch in <br /> diameter, and other debris that could damage the overlying geosynthetic <br /> materials are removed from the surface of the subgrade. Verify that the <br /> subgrade is free of irregularities and is steel drum rolled smooth prior to <br /> the placement of any geosynthetic material. <br /> ♦ Observe that the final surface provides continuous and intimate contact <br /> with the overlying geosynthetics. <br /> ♦ Observe that any soft or yielding areas of the subgrade are adequately <br /> excavated and replaced in accordance with the specifications. <br /> ♦ Coordinate with the Contractor to perform subgrade verification surveys <br /> upon completion of the subgrade preparation. Observe corrective action <br /> measures as determined by the verification surveys. Verification surveys <br /> will also be used to determine the limits of the subgrade preparation for <br /> measurement and payment applications. <br /> 3.4.4 Vegetative Layer <br /> ♦ Observe that the material source is suitable for the vegetative cover and <br /> is free of particles greater than 2-inches in diameter. <br /> ♦ Observe that grade control construction staking is performed before work. <br /> ♦ Perform sieve analysis (ASTM D422) to observe that materials are in <br /> compliance with requirements of the technical specifications. Perform <br /> tests at testing frequencies specified in Table 3-2. <br /> ♦ Observe that the vegetative cover is placed in one uniform lift and that <br /> placement operations do not damage underlying geosynthetic <br /> installations and piping system installations. <br /> ♦ Coordinate with the Contractor to perform cover thickness verification <br /> surveys upon completion of placement operations. Observe corrective <br /> action measures as determined by the verification surveys. Verification <br /> surveys will also be used to determine the limits of the vegetative layer <br /> for measurement and payment applications. <br /> Vector Engineering, Inc. .143E Spring Hill Drive*Grass Valley, CA• 530 272-2448 <br /> P 9 Y ( ) <br /> -20- <br />