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HARGIS+ASSOCIATES, INC. • <br /> ' Timothy J. Verhagen, Esq. <br /> July 16, 1993 <br /> Page 4 <br /> 1 .4 Deep Zone <br /> ' Water level elevations in 10 deep zone monitor wells ranged from <br /> approximately -49.5 feet msl in monitor well MW-361 to approximately -54.7 feet <br /> msl in monitor well MW-464 (Table 3; Figure 5) . Monitor well MW-361 is located <br /> in the MCTC facility north yard. Monitor well MW-464 is located on Adelbert <br /> Avenue north of Main Street. <br /> Comparison of water level elevation data obtained in January-February 1993 <br /> ' with April -May 1993 data indicates that water levels have increased in all <br /> 10 deep zone monitor wells during this period (H+A, 1993) . Water level increases <br /> ranged from approximately 1.6 feet in monitor well MW-462 to approximately 4.0 <br /> ' feet in monitor well MW-361 (Table 3) . Monitor well MW-462 is located on Brown <br /> Lane south of the Mormon Slough. Monitor well MW-361 is located in the MCTC <br /> facility north yard. <br /> ' 2.0 GROUNDWATER QUALITY <br /> ' Groundwater samples for total dissolved chromium analysis were collected <br /> from 1 shallow and intermediate zone extraction well , 1 shallow zone monitor <br /> well , two 100-foot sand reclamation wells, one 100-foot sand monitor well , <br /> 9 intermediate zone reclamation wells, 12 intermediate zone monitor wells, 2 deep <br /> zone reclamation wells, 3 deep zone monitor wells, 4 CWS wells, 7 domestic wells, <br /> and 4 irrigation wells (Tables 1, 4, and 5) . In addition, soil moisture and <br /> groundwater samples for total dissolved chromium analysis were collected from <br /> 1 18 lysimeters, 4 extraction wells, and 3 monitoring tubes for evaluation of <br /> full -scale soil flushing operations in the vicinity of the retort pit. A <br /> progress report on the full-scale soil flushing operations in the vicinity of the <br /> retort pit has been prepared by Black & Veatch and is being provided under <br /> separate cover. <br /> 3.0 PERFORMANCE MONITORING <br /> The objective of performance monitoring is to provide data necessary to <br /> evaluate the effectiveness of the remedial wellfield in capturing and extracting <br /> groundwater containing chromium concentrations greater than 0.05 milligrams per <br /> liter (mg/1 ) (H+A, 1991a and 1991b) . <br /> ' Instantaneous pumping rates were recorded and average pumping rates were <br /> estimated for pumping reclamation wells using totalizer data recorded at <br /> respective reclamation wellheads (Table 6) . Instantaneous pumping rates for <br /> treclamation wells were recorded at the time of groundwater sampling during the <br />