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Since the Corcoran Clay may not occur under the south side of the <br />landfill, background water quality in the shallow zone may not be <br />determined from a well placed upgradient from the landfill. If a <br />shallow perched zone is confirmed, a third shallow well will be <br />installed in an upgradient or crossgradient position for background <br />water quality. The need for additional deep wells will be assessed <br />when sampling results and the ground -water gradient are evaluated. <br />All wells in the detection monitoring program will be sampled quarter- <br />ly. If Corral Hollow Creek is flowing during quarterly well sampling, <br />one upgradient and one downgradient surface -water sample will be <br />collected for analysis. The water samples will be analyzed for <br />volatile organic compounds (VOCs) (according to EPA Method 8240) as <br />well as inorganic and general water quality parameters using standard <br />chemical and physical analytical methods as part of the detection <br />monitoring program. VOCs will be used as "indicator" parameters for <br />migration of contamination from the landfill. <br />SETTLEMENT <br />Settlement within refuse fill, a characteristic of all landfills, is <br />affected by various factors, including: <br />• Placement density <br />• Consolidation of the refuse under loads imposed by over- <br />lying fill <br />• Biological decomposition <br />• Chemical decomposition <br />• Filtering of fines into voids <br />• Refuse composition (physical makeup) <br />PJ9 9390310.00D <br />14 <br />