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Foothill Sanitary Landfill — Module 1 December 2003 <br />County of San Joaquin Job No 031602 00 02 <br />® grab tensile strength (ASTM -4632) <br />® interface shear strength (GCL/ 60 mil geomembrane and internal shear) <br />Twenty (20) GCL samples were tested for conformance. Based on 1,670,000 ft2 of <br />GCL received, this testing frequency corresponds to one test per 83,500 ft2, which <br />satisfies the specified requirement of one test per 100,000 square feet (sf). Per the <br />specifications, the frequency of index flux testing was a minimum of 1 test. One (1) <br />GCL sample was tested for index flux. Results of the conformance testing indicated <br />that the materials met the requirements of the project specifications. <br />Interface shear testing was conducted for both the base liner components (foundation <br />layer/GCL/geomembrane) and the sideslope liner components <br />(GCL/geomembrane/geocomposite). Initial testing of the interface shear strength was <br />conducted on Bentofix NWL material. The results of this testing indicated that the <br />material did not meet the project specifications. Further testing was conducted on the <br />Bentofix NWL material on different samples based on the manufacturer's peel strength <br />results. Testing was conducted on material that represented 20, 22, 24 and 26 pound <br />peel strength. Test results for shear strength on these samples did not meet the <br />project specifications. It was then determined that the Bentofix NWL35 material would <br />be required in order to meet the project specifications for shear strength. Bentorfix <br />NWL35 material has a minimum peel strength of 35 pounds. Samples of the Bentofix <br />NWL35 material were tested and results indicated that this material met the project <br />specifications. Based on the interface shear strength testing, only material with a peel <br />strength greater than 35 pounds was deployed in Module 1. A summary of the <br />conformance test results are shown in Tables 3 and 4. Detailed test results are <br />provided within Appendix I. <br />Vector Engineering, Inc. • 143E Spring Hill Drive • Grass Valley, CA 95945 • (530) 272-2448 <br />22 <br />