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14 <br /> B. Methods <br /> 1.The Contractor shall excavate a 5-foot square hole extending 3 inches below the ground <br /> surface. A 5-foot square wood form 6 inches deep shall be placed over the excavation to <br /> form the concrete pedestal above the ground surface as shown in the Plans. <br /> 2. A protective cover constructed of a steel pipe (riser) with a minimum wall thickness of <br /> 3/16 inches and a minimum of 4-1/2 feet long and a locking lid shall be installed over each <br /> monitoring well as shown in the plans. The minimum diameter of the riser shall be 8-inches <br /> for single and dual completion monitoring wells and 14-inches for triple completion <br /> monitoring wells. <br /> 3. The riser shall be suspended above the top of the well such that the top of the riser is 2 <br /> feet above grade. A concrete slurry shall then be poured and tamped on top of the annular <br /> seal such that the riser is set in concrete. The concrete will be poured and tamped until it <br /> is approximately 3 inches below grade. The remaining portion of the excavation and the <br /> wood from will then be poured with concrete slurry, tamped and finished with a graded <br /> surface which shall slope gently away from the riser. <br /> 5. The finished concrete pedestal shall be 9 inches in thickness at 6 inches above grade. <br /> The riser set in the center of the pedestal will extend 2 feet above grade. The steel riser <br /> shall be painted with a high-grade rust resistant paint of a neutral color approved by the <br /> Engineer. <br /> 2.3.10 BORE HOLE ABANDONMENT <br /> A. General -- At the Engineer's determination, following completion of geophysical logging <br /> operations, the bore hole, or a lower portion of a bore hole, shall be destroyed in accordance with <br /> State and local standards for the construction and destruction of wells and other deep excavations. <br /> B. Methods—Neat cement shall be injected from the bottom of the borehole by means of pumping <br /> equipment and a tremie pipe. The tremie pipe may be raised as the grout is placed but the <br /> discharge end must be submerged in grout at all times until the grouting is completed. <br /> 2.3.11 REJECTED BOREHOLE OR WELL <br /> A. General — No payment will be made for any labor or materials involved in the construction of <br /> any borehole or well when such a hole fails to reach the specified or directed final depth and/or <br /> diameter for any preventable cause, or when such a test hole fails to meet these Technical <br /> Provisions. Such holes will be rejected and shall be replaced as specified herein. Preventable <br /> failures include any failure caused by faulty or inadequate drilling equipment, failure caused by <br /> negligence or improper drilling operations or techniques,failure caused by the installation of faulty <br /> or non-approved materials, or failure caused by improperly protecting drill holes and drilling work <br /> from the natural elements, including cave-ins resulting from existing soil conditions. <br /> B. Sealing and Replacement of a Rejected Borehole or Well --Any rejected borehole or well <br /> shall be sealed at no additional cost to the Owner and in accordance with provisions of Section <br /> 2.3.10. Any casing remaining in the hole shall be cut off at a depth of five feet and the upper portion <br /> thereof removed. <br /> C. Non-Payment for Borehole and Well Abandonment -- No payment will be made for the <br />