ARCHIVED REPORTS_1988_1 - Laserfiche WebLink

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' II. PROPOSED DETECTION MONITORING NETWORK ' A. GROUND -WATER MONITORING NETWORK ' The proposed ground -water monitoring network consists of three wells to monitor the deep regional aquifer and two wells to monitor a tsuspected shallow perched zone. The proposed Subchapter 15 monitoring well network is the same as the SWAT monitoring well network described ' in Part 1. Existing Well MW -1 will be incorporated into the program as a deep downgradient well. Two additional deep ground -water monitoring wells will be installed: one upgradient (MW -2) and one downgradient (MW -3) of the landfill (see Figure 1). To confirm the presence of a shallow perched zone in the Corcoran Clay, two shallow wells (MW -4 and MW -5) ' will be installed adjacent to the two deep downgradient wells. Well MW -2 will function as a deep background water -quality well, while ' Wells MW -1, MW -3, MW -4, and MW -5 will function as point -of -compliance wells. ' Since the Corcoran Clay does not appear to occur under the south side of the landfill, background water quality in the shallow zone cannot ' be determined from a well placed upgradient of the landfill. If a shallow perched zone is confirmed, a third shallow well will be ' installed in an upgradient or crossgradient position for background water quality. The need for additional deep wells will be assessed upon evaluation of sampling results and the ground -water gradient. Drilling and monitoring installation procedures and monitoring well ' design are described in Part 1, Section III. Hydraulic testing will be performed as part of the investigation of hydrogeologic conditions ' at the site. Relatively undisturbed soil samples from the shallow and deep saturated zones will be collected during drilling for laboratory ' testing of permeability and porosity. Field permeability tests (i.e., slug tests) will be performed for both shallow and deep wells. ' 19 E(Y1Con Associates