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Because the groundwater flow velocity is very slow (approximately 3 feet per year) In the <br /> shallow perched zone, a determination of effectiveness of the corrective action may take <br /> several years. <br /> 7.2.2 Surface Water <br /> Available data indicate that the Corral Hollow Creek has not been impacted by the landfill <br /> release; however, surface water monitoring of the creek is included as part of the <br /> corrective action monitoring plan to monitor potential future impacts. The concentration <br /> limits are proposed to be the background concentrations. Synthetic parameters do not <br /> occur naturally in surface water, and their detection would be an indication of impact due <br /> to leachate discharge from the landfill. Therefore, the concentration limits for synthetic <br /> organic compounds will be their respective method reporting limits (i.e., background <br /> concentrations). <br /> The concentration limits for inorganic parameters detected in samples collected from the <br /> downstream monitoring location (SW-2) will be calculated using the tolerance interval <br /> statistical procedure applied to upstream (SW-1)monitoring data. <br /> Concentration limits for SW-2 will be the upper tolerance limits calculated for background <br /> monitoring point SW-1 after four quarters of data are collected. The concentration limits <br /> will be updated on a quarterly basis to provide ongoing definition of background surface <br /> water quality. <br /> Each quarter, analytical data obtained for monitoring point SW-2 will be compared to the <br /> upper tolerance limits (and lower tolerance limits in the case of nitrate-nitrogen and pH) <br /> calculated for SW-1 to determine the effectiveness of the corrective action program. If <br /> the concentrations of monitoring parameters or COCs detected in samples from SW-2 <br /> exceed the concentration limits (i.e., background values), it may be an indication that <br /> downstream surface water quality has been adversely affected due to the release from the <br /> landfill. <br /> 7.3 Monitoring Points <br /> The monitoring points to which the WQPS apply consist of six groundwater monitoring <br /> wells (MW-1 through MW-5 and SB-1) and one surface water monitoring point (SW-2). <br /> The monitoring points are shown on Figure 2. <br /> r <br /> SAC\N.\PJM 39\09390031.9BG-94\sdg:I Rev.0,4R0/95 <br /> 0939-003.19 7-3 <br />