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• <br />02000 GeoS~•ntec Consultants <br />IIV'I'ERFACE DIRECT SHEAR TESTING <br />TEST PROCEDURES AND CONDTCIONS <br />TEST SERIES NUMBER: 1 <br />Test Speeimeo Coafigaration (from top to bottom) aced P-acemeot Conditions: <br />. upper shear box: drain cover fill initially placed at a dry unit weight of 112.3 pcf and a moisture contem <br />of 5.4 %. Final moisture corttertt was 12.2% for the test series; <br />• 80.mi1 GSE smooth VLDPE geomembrane; and <br />. lower shear box: iron clad soil liner material initially placed at a dry unit weight of 115.3 pcf and a <br />moisture oorttent of 12.6%. Final moisture content wes 12.4°k for the test series. <br />Test interface: upper soil against goomembtane against lower soi! <br />Tat Procedures for Each Normal Stress Coaditioa: <br />• Afresh specimen of the iron clad soil liner materia: was eotnpaaexfi into the lower box by hand tamping. <br />The initial target oompadion conditions ~.e., dry unit weight and moisture content) correspond to 95°~6 <br />of maximum dry unit weigh and the optimum moisturo based on a standard Procxor compaction test as <br />provided by CC&V. <br />~- <br />• Afresh specimen, of the geomexnbrane was trimmed from the bulk stunple and ttat placed above the <br />lower soil. The gcamembrane w•aa not attached to either the lower or upper shear boxes. With this <br />method of test specimen preparation, shear failure would occur at the weakest interface within the test <br />aces-section. <br />• Afresh specimen of the drain Dover 511 at its as-receivod moisttue ootttent w•as compacted direexly on top <br />of the: geomembtane specimen. 'there was no initial target oompadion condition of dry unit weight <br />specified by CC&V. <br />Wetting: the drain cover fill and the top of the geomembrane were wetted with tap water prior w <br />shearing. Tap watex was pouted through the dratn ~'~ fill and allowed to drain at the interface <br />between the drain Dover fill and flu: top of the geomembrane. <br />. Test rtonaal stras: S00 psi. <br />. Constant shear displacement rate: 0.04 in/min. <br />• Shear bax itae: 6 in. by 6 in. <br />• Each test was sheared until a minimum fatal shear displacement of 2 in. was achieved. <br />°• <br />GL11126/SGI000II.DOC 1 00.02.25 <br />