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• <br /> • <br /> Beneath the Concrete Reservoir <br /> AEMC does not plan to excavate or advance boreholes beneath the concrete reservoir. <br /> • There exists no evidence that the concrete surface is cracked and that fuel oil has <br /> contaminated soil beneath the reservoir. However, AEMC proceeded with site <br /> investigation activities under the assumption that soils beneath the reservoir are <br /> contaminated with fuel oils. Due to the obvious physical limitations associated with <br /> • characterizing soils beneath the reservoir, AEMC chose to investigate area groundwater as <br /> a valid indicator of significant sub-reservoir contamination. <br /> Under the jurisdiction of the Central Valley Regional Water Quality Control Board <br /> (RWQCB), AEMC established three groundwater monitoring wells and recently (February <br /> • 1988) completed thequarterly/one year monitoring program required by the RWQCB. <br /> No degradation of groundwater quality was detected during the one monitoring program, <br /> hence AEMC requested, by letter dated 7 March 1988, the RWQCB's review and <br /> • determination of the water quality impacts at the Beck property. <br /> The RWQCB requested AEMC, by letter dated 4 April 1988, to extend the groundwater <br /> monitoring period an additional six months due to the significant shifts in the groundwater <br /> gradient over the one year period. The primary concern of the RWQCB is that the two <br /> • downgradient wells "may" not be properly positioned to detect a plume of contamination <br /> from the Beck property, in which case a fourth well would likely be required by the <br /> RWQCB. Subsequent conversations with the RWQCB have indicated that the <br /> establishment of a properly positioned fourth monitoring well (upgradient), and <br /> • subsequent sampling/analysis would provide the information necessary for the RWCQB to <br /> accurately assess the water quality impacts. <br /> AEMC plans to establish a fourth groundwater monitoring well (BD4) in a downgradient <br /> • location, as identified on Figure 2. The directions of the groundwater gradient over a one <br /> year period is displayed on Figure 2. Refer to Attachment 3 for a description of the well <br /> installation and development procedures to be implemented by AEMC. AEMC will <br /> obtain RWQCB approval for the establishment of the fourth monitoring well prior to its <br /> • establishment. <br /> 5 <br /> 0 <br />