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amec'? <br />• <br />e. Do not field seam without the Seaming Supervisor present. <br />D. Field Trial Seams <br />Trial seams shall be conducted at the beginning of each seaming period and within 30 <br />minutes of commencement of seaming, at the CERTIFYING ENGINEER's discretion, <br />and immediately following any work stoppage (i.e., lunch, weather conditions, etc.) of 30 <br />minutes or more for each seaming apparatus used that day. Each Seamer shall make at <br />least one trial seam each day. <br />Testing shall include visual observation of a trial seam on the geornembrane material. <br />The INSTALLER will mark the trial seam with date, ambient air temperature, welding <br />machine number, welding technician identification, and machine temperature and speed. <br />For extrusion welding, the INSTALLER will include the nozzle and extrusion settings <br />and welding technician identification. The remainder of trial seam should be cut in two <br />pieces; one to be retained in CC&V's archive; and one to be retained by the <br />INSTALLER. <br />0 <br />All trial seams shall be made at a location selected by the CERTIFYING ENGINEER in <br />the area of the seaming and in contact with the subgrade. The trial searn samples shall be <br />ten (10) feet long for fusion seaming and five (5) feet long for extrusion seaming, with the <br />seam centered lengthwise. Specimens one (1) inch wide shall be cut from opposite ends <br />of the test seam by CONTRACTOR. CONTRACTOR shall use a. tensiometer to test <br />these specimens for shear and peel. Both inside and outside tracks of :Fusion welds will be <br />tested for peel. For both fusion and extrusion welds, two (2) coupons will be tested for <br />peel and one (1) coupon for shear. The tensiometer shall have a grip separation of four <br />(4) inches plus the width of the seam. The seam is to be centered between the clamps. <br />The grip separation rates for LLDPE are twenty (20) inches per minute for shear and <br />twenty (20) inches per minute for peel. These tests shall not fail according to the criteria <br />in Section 2.01. A break through the weld or at the weld/sheet interface shall be <br />considered a failure in both shear and peel strength tests unless the weld strength exceeds <br />the sheet strength, as discussed in Section 2.01. If a trial seam fails to meet field seam <br />SPECIFICATIONS, the seaming apparatus and/or reamer shall not be accepted and shall <br />not be used for seaming until the deficiencies are corrected and two consecutive <br />successful full trial seams are achieved. <br />4. CONTRACTOR shall mark the test weld with date, ambient temperature, welding <br />machine number, welding technician identification, machine temperature, and speed. For <br />extrusion welding, CONTRACTOR shall record the nozzle and extrusion settings. <br />5. CONTRACTOR shall cut remainder of successful trial seams into two pieces, one to be <br />retained in CC&V's archives and one to be retained by CONTRACTOR. <br />3.08 NONDESTRUCTIVE TESTING <br />A. CONTRACTOR shall non-destructively test all field seams over their full length. All test <br />equipment shall be furnished by CONTRACTOR. <br />B. The following vacuum box procedures are applicable to extrusion seaming and shall be followed <br />by CONTRACTOR: <br />a 1. Excess sheet overlap shall be trimmed away. <br />Section 02776 Page 17 of 22 <br />Geomembrane <br />S:\Projects\1125 CC&V Phase 5 VLF\I - Tech Specs\Arequa IFC Specs\02776.0.doc <br />September 3, 2008 <br />Revision 1