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C7 <br />Foothill Sanitary Landfill — Module 1 December 2003 <br />County of San Joaquin Job No 031602 00 02 <br />4.5.2 COA Evaluation of Operations Layer <br />Vector's CQA Monitors performed sieve analyses and sieve wash tests (ASTM D-422 <br />and ASTM D-1140) on twelve (12) evaluation samples and twenty-four (24) construction <br />samples of the base and sideslope operations layer material. In addition, fifteen (15) <br />grab oven moisture content determination tests (ASTM D-2216) were conducted on the <br />operations layer material. <br />The results of sieve analysis tests on the operation layer indicated that 100% of the <br />material was passing the 3/4 -inch sieve. The results indicated that the material met the <br />requirements of the project specifications. The results of the operation layer testing are <br />included in Appendix H. <br />4.6 Soil Surveying <br />Surveying to verify the elevations and grades of the earthworks was conducted by <br />Surveyors Group Inc., under the direction of a professional land surveyor registered in <br />the State of California. The earthwork components surveyed include the following: <br />• Top of prepared subgrade <br />• Top of LCRS gravel <br />• Top of operations layer. <br />As -built surveys of these components are presented in Exhibit B. <br />Vector Engineering, Inc. • 143E Spring Hill Drive - Grass Valley, CA 95945 • (530) 272-2448 <br />20 <br />