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CITY OF LATHROP 3. Each casing will be fitted with appropriate centralizers to ensure that the well casings meet the minimum 2-inch separation distance from the borehole wall 4.The top of each casing shall be furnished with a watertight and locking security plug. C. Gravel Envelope--All gravel or coarse-grained sand for packing shall be hard, water-worn, and washed clean of silt, fine sand, dirt, and foreign matter (crushed gravel will not be accepted). It shall be well rounded, graded, and selected. The gravel envelope material is specified to be Silica Resources Incorporated (SRI) (Marysville, CA) sand, or equal. Alternative materials are subject to the approval of the Engineer. A description and sieve analysis of gravel packing materials to be delivered to the site must be submitted prior to the use of the material in the Work. The gravel, if stockpiled at the well site, shall be protected, and kept free of foreign matter. 2.3 TEST HOLE DRILLING AND MONITORING WELL CONSTRUCTION 2.3.1 MOBILIZATION A. General 1. Mobilization shall include acquisition of all necessary permits; transportation of personnel, equipment, and operating supplies to and from the site establishment of portable sanitary facilities, preparing a work site sufficient to support equipment and personnel in a safe and workman-like manner, and other preparatory work at the site required by the Contractor for his/her operations. 2. The Contractor shall provide one complete direct rotary drilling unit with shaker, de- sanding cones,and containment facilities if directed by the Engineer. The Contractor shall also provide all tools, accessories, power, fuel, materials, supplies, lighting, necessary to conduct efficient drilling operations. The drilling unit shall be in good condition and of sufficient capacity to perform the specified drilling and well construction. 2.3.2 TEST HOLE DRILLING A. Scope--The test hole shall be drilled using the direct rotary method. The hole shall be drilled at a minimum diameter of 8-3/4 inches. The final depth of the test hole will depend on location and the lithology encountered while drilling and will be determined by the Engineer. It is anticipated that the test hole will be drilled to a depth of 800 feet. B. Methods 1. The test hole shall be drilled using the direct circulation rotary drilling method of construction. The drilling fluid for the direct rotary drilling operation shall conform to the specifications in SECTION 2.1.3. LUHDORFF&SCALMANINI CONSULTING ENGINEERS 10