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Knight Piesold <br />G ONSY LTING <br /> <br />1 <br /> <br /> <br /> <br /> <br /> <br /> <br />LJ <br />I1 <br /> <br /> <br /> <br />CJ <br /> <br /> <br /> <br />42 The Contractor shall make arrangements with the geotextile supplier to have a technician, skilled <br />43 in this paving geotextile work, present at the project site during this work to give any technical <br />44 assistance needed. <br />45 <br />46 420.05 Impervious Lining. Geomembranes for lining shall be loosely laid (not stretched) to <br />47 avoid any rupture of the lining. If field lap joints are necessary, the joints shall be formed by <br />48 lapping the edges of panels in accordance with the manufacturer's recommendations. The <br />49 contact surfaces of the panels shall be cleaned to remove all dirt, dust, and other foreign <br />50 materials. Sufficient cold-applied vinyl to vinyl bonding adhesive shall be applied to the contact <br />51 surfaces in the joint area and the two surfaces pressed together immediately. Wrinkles in the <br />52 joints shall be smoothed out. <br />53 <br />54 Necessary repairs to the geomembrane shall be patched using the geomembrane material itself <br />55 and cold-applied vinyl to vinyl bonding adhesive. The bonding adhesive shall be applied to the <br />56 contact surfaces of both the patch and the lining to be repaired and the two surfaces pressed <br />57 together immediately. Any wrinkles in the repair joints shall be smoothed out. <br />58 <br />59 420.06 Erosion Control and Drainage. Geotextiles for erosion control or drainage shall be <br />60 loosely laid (not stretched) with the roll direction the same as the anticipated water flow, and in a <br />61 manner that avoids any rupture of the cloth. The geotextile may be anchored in place with <br />62 securing pins at 3 foot spacing along but not closer than 2 inches to all edges and to the extent <br />63 necessary to prevent displacement. <br />64 <br />65 When shown on the plans, erosion control geotextile maybe held in place using 6 inches of clean <br />66 embankment with a minimum 6 inch trench at the top of the slope. <br />67 <br />68 Overlaps shall be at least 12 inches on slopes 3:1 and flatter, and at least 24 inches on slopes <br />69 steeper than 3:1. Laps shall be made with the uphill layer on top. Sewn seams in accordance with <br />70 the manufacturer's recommendations may be used in place of overlaps. Full rolls shall be used <br />71 whenever possible in order to minimize the number of roll end laps. Lengths and widths of <br />72 individual sheets shall be at the Contractor's option. <br />73 <br />74 420,07 Geotextile Separator. The geotextile shall be unrolled as smoothly as possible on the <br />75 prepared subgrade in the direction of construction traffic. The geotextile shall be placed by <br />76 machinery or by hand labor. The geotextile shall not be dragged across the subgrade. Wrinkles <br />77 and folds in the geotextile (not associated with roadway curves) shall be removed by stretching <br />78 and staking as required. The geotextile may be held in place prior to placement of cover by pins, <br />79 staples or piles of fill or rock. On curves, the geotextile may be folded to conform to the curve. <br />80 The fold or overlap shall be in the direction of construction and held in place as prescribed <br />81 above. Adjacent geotextile rolls shall be overlapped in the direction of subbase placement using <br />82 the guidelines in Table 420-1. Before covering, the condition of the geotextile will be inspected <br />83 by the Engineer to determine that no holes, rips or other defects exist. If any defects aze <br />84 observed, the section of the geotextile containing the defect shall be repaired by placing a new <br />85 layer of geotextile extending beyond the defect in all directions a minimum distance equal to the <br />86 overlap shown in Table 420-1. - <br />3-23 <br />G'\101100100.02W\RepotlslKP\Tetlmiwl Specifirations.000 February 3, 2006 <br /> <br />