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Reclamation District No. 38 NMR Multi-Benefit Project Field welding shall be in accordance with ANSI/AWWA C206-17 (Field Welding of Steel Water Pipe). The Contractor shall notify the Engineer whenever welding of pipes and preparatory work is being done. 10.3.4. Backfill Backfill of siphon excavation shall be done in accordance with Section 7 of the Technical Specifications. 10.4. Cleanup Upon completion of the Siphon Modifications, all debris and surplus materials resulting from the work shall be removed at the direction of the Engineer. 11.MONITORING WELL ABANDONMENT The work covered by this Section consists of furnishing all labor, equipment, and materials necessary to perform all operations necessary for the abandonment of a monitoring well, and other incidental work required to complete the work,as shown on the Drawings, as hereinafter specified, and as directed by the Engineer. The monitoring well shall be abandoned in accordance with State and County standards and regulations. 11.1. Preliminary Work Before the well is destroyed, it shall be investigated to determine its condition, details of construction, and whether there are obstructions that will interfere with the process of filling and sealing. This may include the use of downhole television and photography for visual inspection of the well. The well shall be cleaned, as needed, so that all undesirable materials, including obstructions to filling and sealing,debris, oil from oil-lubricated pumps, or pollutants and contaminants that could interfere with well destruction are removed for disposal. The Engineer shall be notified as soon as possible if pollutants and contaminants are known or suspected to be in a well to be destroyed. Well destruction operations may then proceed only at the approval of the Engineer. The Engineer should be contacted to determine requirements for proper disposal of materials removed from a well to be destroyed. Where necessary,to ensure that sealing material fills not only the well casing but also any annular space or nearby voids within the zone(s)to be sealed,the casing should be perforated or otherwise punctured. 11.2. Materials Sealing materials shall have such low permeability that the volume of water passing through them is of small consequence. Suitable impervious materials include neat cement, sand-cement grout, concrete, and bentonite clay. Filler materials shall include clay, silt, sand, gravel, crushed stone, or native soils. Material containing organic matter shall not be used. Technical Specifications Page 17