BC 1990 10 15 - Laserfiche WebLink

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549 information needed to complete the Section 404 Permit. No action was taken by the Board and Mr. Watson will present a certified bid tabulation for consideration by the Board at its next meeting. Mr. Michael M. Ruffin, County Manager, presented an update on finances for the Coddle Creek Reservoir project and reported that funds would be available to underwrite the cost of the project. He noted that bids for Parts A and B were based on estimated quantities and could decrease or increase at the end of the contract. In conclusion, Mr. Ruffin estimated at least a $3.5 million in savings as a result of the current soft construction industry. Chairman Lentz recognized the following members of Boy Scout Troop 94 from Mt. Pleasant who were present for the meeting: Chuck Bowman, Scoutmaster, and members Jonathan Bowman, Franklin Cook, Jeff Walters, and Micah Hahn. Mr. Tarry Gautney, Landfill Supervisor, reviewed the engineering proposal for geotechnical work needed for the methane gas study and proposed demolition area at the Sanitary Landfill. UPON MOTION of Commissioner Moss, seconded by Chairman Lentz with Commissioners Moss, Hamby, and Simmons and Chairman Lentz voting for, the Board approved the following proposal from Camp Dresser & McKee. October 3, 1990 Dr. William F. Pilkington Health Director Cabarrus County Health Department 715 Cabarrus Avenue West Concord, North Carolina 28025 Geotechnical Work Needed for Methane Gas Study and Proposed Demolition Area Dear Fred: The purpose of this letter is to request an amendment to our contract for the methane gas migration study to allow completion of additional geotechnical work for the proposed methane gas venting trench as well as the proposed demolition disposal area. As we have discussed, because of the presence of methane gas in some of the gas monitoring wells surrounding the old fill area, we have recommended construction of a cut-off trench around the old fill area and the existing buildings at the landfill. This trench, which will be excavated down to the ground water table, will intercept the migrating gas and vent it to the atmosphere before it can migrate off the landfill property or into the on-site landfill buildings. The ground water table acts as a lower barrier to the migration of methane gas, and, therefore, our vertical trench must reach the water table to insure that all pathways for gas movement have been intercepted. In evaluating the trench option, we are concerned that the ground water table in some areas where the trench will go may be deeper than a large backhoe can reach. This concern is based upon our review of ground water level readings around the landfill site. We believe we can route the trench in areas where the ground water table is within reach, however, this must be verified in the field to reduce the possibility of problems when we go to construction. Other options, such as passive vent wells may have to be used in areas where the water table is not within reach of a backhoe. With this amendment to our contract, we are proposing to retain a soil drilling firm, who will work with a CDM staff geologist in the field, to determine the depth to the ground water table along the proposed trench route. Based upon the results, we will be able to better design the venting trench and other options if necessary, as well as provide a better bid package for perspective contractors. Recently, you also asked us to evaluate the use of the permitted stockpile area at the landfill as a demolition disposal area. The permitting of this area will reduce the amount of waste going into the sanitary portion of the landfill as well as assist you in complying with the Senate Bill 111 requirement that all yard waste be diverted from sanitary landfills beginning January 1, 1993. Mike Babuin of our staff recently met with Jim Coffey of the Division of