FIELD DOCUMENTS AND WORK PLANS 1991

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least sixty thin-walled tubes during Phase I and a minimum of thirty thin-walled tubes for Phase III. Thin-walled tubes will be labeled by the Engineer. The Contractor shall supply labels with space for job name, boring number, and interval sampled. The coupling head for the thin-walled tube sampler shall be decontami- nated after obtaining each sample. Thin-walled tubes shall be decontaminated and shall not be used more than once. The ends of the thin-walled tubes shall be sealed by the Contractor by sealing the ends of the soil in the tube with wax, providing a spacer for partial recovery and taping an air-tight plastic cap over each end of the tube, as approved by the Engineer. 2A-6. ABANDONMENT OF BORINGS. Any boring that does not meet the depth, alignment, plumbness or other requirements, or any boring on which the Contractor stops work prior to completion, will be considered as an abandoned boring. A new boring shall be started in the immediate vicinity at a location designated by the Engineer. No payment will be made for any work on an abandoned boring. An abandoned boring shall be backfilled and sealed with cement-bentonite grout in accordance with Section 2A-8, as approved by the Engineer. 2A-7. WELLS, MONITORING TUBES, AND LYSIMETERS. The Contractor shall furnish all labor, materials, and equipment required for installing injection and extraction wells, monitoring tubes, and lysimeters as specified herein. No solvents or lubricants shall be used, unless approved by the Engineer, before or during the installation of the wells, monitoring tubes, and lysimeters. The extraction well , monitoring tubes, and lysimeters shall be vertical . All injection wells, except IW-6, 7 and 8, shall be vertical . IW-6, 7 and 8 shall be 450 from the horizontal . Construction diagrams for the wells, monitoring tubes, and lysimeters are included on Drawings G-3 and G-5. PVC pipe and screen sections shall be joined using threaded flush joints that are acceptable to the Engineer. Riser pipe and screen shall not be joined using solvent welding or glue. All PVC pipe and screen shall be new. Pipe tees shall be installed approximately 2 feet below land surface during construction of the injection wells. Only the pipe tees can be solvent welded or glued to the riserpipes for the injection wells. Each well (except for the extraction well ) , monitoring tube, and lysimeter shall be provided with a heavy-duty, watertight, cast-iron protective enclosure, with similarly keyed padlocks. The covers shall be cleaned and primed prior to painting with two coats of rust (MARLEY SSFS ) 2A-6 (CONTRACT NO. 13) (11654.652 )