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1 <br />Score o/work <br /> <br /> <br /> <br /> <br />1 <br />1 <br />LJ <br /> <br /> <br />1 <br /> <br />1 <br /> <br /> <br /> <br /> <br /> <br />Ieast one well be installed downgradient <br />from the pit to intercept any possible <br />contamination of local groundwater from the <br />pit and serve as a Point of Compliance. Mr. <br />Stevens further stated that the placement of <br />the remaining two wells is to be made by <br />Greystone during the installation. The <br />objecrive of these two wells is to determine <br />groundwater flow direction and gradient. <br />Condition 3: The County will secure and <br />supply accurate elevations of the ground <br />surface at the proposed four well locations. <br />(Elevations of the tops of the surface casing <br />for the four monitoring wells aze also <br />acceptable.) The method of the <br />determination of elevation and the values <br />secured will be provided to the Division <br />within 14 days after the completion of the <br />drilling program. <br />Work Plan: All wells will be surveyed for <br />accurate ground surface and top of casing <br />elevations. The north side of each well <br />casing will be used when surveying the <br />wells. Depth to water will be measured <br />from the top, north side of the well casing. <br />Groundwater elevations will be calculated <br />using the measured groundwater elevation <br />data and the surveyed well casing elevations. <br />Greystone will provide the values secured to <br />the Division within 14 days after the <br />completion of the drilling program. <br />Condition 4: The County will employ a <br />competent, experienced, licensed and/or <br />certified drilling contractor to drill and <br />complete the four monitor wells. Evidence <br />of the contractor's licenses and/or <br />certifications will be provided to the <br />Division by February 16, 1996. <br />Work Plan: Lincoln DeVore, Inc., <br />Colorado Springs, Colorado, will provide <br />drilling services for this project. Lincoln <br />DeVore has been providing these services <br />since 1978. 'T'hey will use a CME-55 drill <br />rig for this project. Lincoln DeVore is <br />experienced in the areas of geotechnical <br />drilling and piezometer, recovery and <br />monitoring well installation. Their <br />contractor's license and/or certifications will <br />be submitted to the Division by February 16, <br />1996. <br />Condition 5: The County, with assistance <br />from its drilling contractor, will provide the <br />details of how the proposed monitoring wells <br />will be drilled, cased, completed, logged, <br />tested and protected from surface <br />contamination. These details will be <br />provided to the Division by February 16, <br />1996. <br />Work Plan: Prior to drilling, the Colorado <br />Office of the State Engineer, Division of <br />Water Resources, will be contacted to obtain <br />a drilling permit. In addition, a utility locate <br />will be performed. - <br />All monitor wells will be installed using a <br />truck-mounted drill rig utilizing an 8-inch <br />outside diameter (OD) continuous flight <br />auger. During the drilling of the four <br />boreholes, soils will be monitored for the <br />presence of volatile organic vapors using a <br />Thermo Environmental Instruments Model <br />580B organic vapor monitor (OVM) photo- <br />ionization detection meter (PID) calibrated to <br />an isobutylene standazd. Soil sampling <br />depths, PID readings, and lithologic <br />descriptions for the boreholes will be <br />included on the lithologic and well <br />completion logs. <br />Cosul la\ I ~96 <br />2-2 <br />