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The area is free of underground construction besides the landfill <br /> itself; therefore, this was not a major consideration for <br /> determining well location. <br /> Data regarding the age and moisture of waste was not available, so <br /> age and moisture of waste were not used as major design criteria. <br /> Each Monitoring well is 611 in diameter and contains three <br /> monitoring probes (figure 3) . One monitoring probe was placed at <br /> the maximum depth of the well bore, one at approximately one half <br /> the depth of the well bore, and one at approximately 5 feet below <br /> the ground surface. <br /> V. MONITORING AND REPORTING <br /> Monitoring is performed in accordance with the CIWMB's regulations <br /> for closure and postclosure. Methane was monitored monthly for the <br /> first six months according to the recommendation of the LEA. The <br /> frequency was reduced to quarterly after six months and will <br /> continue on a quarterly basis throughout the postclosure period. <br /> Monitoring frequency and parameters being tested may be increased <br /> as necessary or as directed by the Local Enforcement Agency or the <br /> CIWMB. <br /> 10 <br />