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SECTION 02225 <br />ABANDONING OBSERVATION WELLS <br />PART 1 GENERAL <br />1.1 WORK INCLUDES <br />A. Abandoning existing groundwater observation wells <br />(piezometers). Groundwater observation well installation <br />reports are presented in Volume II of the Specifications. <br />B. Completing and submitting State of Colorado, Office of the <br />State Engineer, Well Abandonment Reports for each groundwater <br />observation well abandoned by the CONTRACTOR. <br />1.2 SUBMITTALS <br />A. Administrative: <br />1. Copies of completed Well Abandonment Reports for all <br />abandoned water supply and observation wells. <br />B. Shop Drawings: <br />1. Product data for cement and bentonite to be used in <br />grout. <br />1.3 QUALITY CONTROL <br />A. Field stake, survey, identify and sound to verify depth of <br />each well before beginning abandonment. <br />B. Notify ENGINEER prior to beginning abandonment of each well <br />C. Record information necessary to complete abandonment reports. <br />PART 2 PRODUCTS <br />A. Cement-Bentonite Grout: Cement-Bentonite grout shall be a <br />mixture of Portland cement, pulverize bentonite, and water. <br />The cement-bentonite mixture shall contain between 4 and 6 <br />pounds of bentonite for each 94-pound sack of cement. Water <br />shall be added to form a grout consistency that is suitable <br />for pumping down the borehole. The grout shall be mixed in a <br />manner resulting in a smooth slurry. The proportions of the <br />various materials may be varied by the ENGINEER. <br />B. Portland Cement: Portland cement shall conform to the <br />requirements of ASTM designation for Type II cement. <br />C. Bentonite: Bentonite shall be natural Wyoming sodium <br />bentonite powder containing no additives and ground to pass a <br />No. 200 sieve. The bentonite shall meet the criteria defined <br />by the American Petroleum Institute (API) Specification 13. <br />02225 1 ABANDONING OBSERVATION WELLS <br />