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s File: 5-1008-21/12 :337 Revised: July 8, 1986 - Page 12 o Vadose zone monitoring using such devices as _ pressure lysimeters monitor only a small radium around each installation. Even a dozen installations would represent only a small percentage of the total landfill area. Unless this landfill is designed to channel and collect leachate to a designated area(s) , the optimum location for monitoring would at this point be a best guess effort . o Vadose zone monitoring can be an effective early warning device if installed prior to any leakage. If leakage is being assumed, the installation benefits of vadose zone monitoring devices are minimized and other less costly investigative procedures would provide the same benefit . o Slant drilling to install vadose monitoring is costly and may result in installation of equipment which may not operate properly. Installation of pressure lysimeters in an angled borehole creates severe operating difficulties . Installation of perforated pipe leak detection systems are also very ineffective devices. For example, on a recently completed investigation at a Colorado gold leach operation where a liner failure lost 20, 000 gallons of cyanide solution, barely a drop showed up in their perforated pipe leak detection system. TIME SCHEDULE The following time schedule is recommended for the installation and implementation of the ground water monitoring program at Harney Lane Landfill : TASK COMPLETION DATE 1 . Monitoring plan approval by RWQCB July 18, 1986 and Solid Waste Management Board 2 . Prepare bid documents and select September 30, 1986 contractor 3 . Install and develop ground water November 30, 198.6 monitoring wells, conduct soil borings and install vapor monitoring wells