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' 0 ' NOA Environmental Project Number E98191 ' indicate buried hardpan in old soil horizons. Extensive hardpan development throughout the surface of the Victor Formation indicates a degree of maturity consistent with its Pleistocene age and an absence of recent sedimentation. This is in contrast to the west side of the valley,where alluvial fans ' have been forming in recent times. The Victor Formation has a gentle homoclinal dip toward the west along its uppermost surface. This is assumed to represent the top of the formation. In Sacramento County the top of the formation slopes about 1 meter per kilometer(m/km) and the base dips westward at about 2 m/km, indicating a gradual thickening tot he west. Throughout most of the east side area,the Victor Formation is as much as 30 meters thick and to the west, where it dips beneath a cover of younger materials, it probably attains a thickness of about 45 meters. ' The Victor formation is the most important water-bearing formation for domestic and shallow irrigation wells on the southeast side of the basin. It has moderate permeability thoroughout most of ' its area of occurrence. It is considerably more permeable than the underlying Laguna Formation,but because of its limited saturated thickness,high-capacity irrigation wells must be deep enough to tap aquifers in the Laguna Formation also. There are insufficient data on wells drilled solely in the Victor Formation to evaluate its water- producing potential. Yields are not generally expected to exceed 3,6001/min,but some wells located in more permeable portions where sand an gravel channels are present may have yields of up to 7,20001/min. Davis and Olmstead(196 1)refer to a 31-meter well near Sacramento,completed only in a Victor aquifer as having a yield of 6,0001/min and a specific capacity of 420 I/min/m ' SITE MONITORING METHODOLOGIES AND SPECIFICATIONS ' Groundwater Monitorine Well Locations: So as to conform with the requirements of the CVRWQCB WDR Order No.99-103,2 August, 1999 ' a plan for the installation of three (3) Groundwater Monitoring Wells is herein proposed. The placement of these groundwater monitoring wells presupposes that the groundwater gradients in the area are stratigraphically controlled. Groundwater in the first saturated zone appears to be flowing ' in a westerly/northwesterly direction. The proposed locations of the Groundwater Monitoring Wells are depicted in the Appendix portion of this work plan. It is proposed to construct the"upgradient"well on the TRV East Facility. The well is proposed to ' be constructed as close as possible to the western property boundary approximately one hundred and fifty feet(150') northwest of the stormwater detention pond. The exact location will be dependent ' on site access and underground utility location,and will be determined in the field at the time that the well is constructed. The two (2) "downgradient" wells are proposed to be constructed on the TRV West facility. It is Page -9- in