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Kellogg Garden Products ECOLOGIC Engineering Groundwater Monitoring Well Installation Work Plan KELG04-001 11/10/2004 109 feet following the completion of the well (at 340 feet bgs), indicating a vertical downward gradient. This condition may have resulted partially from 1) pumping from deeper water supply wells in the area; 2) interception of a perched groundwater table during initial drilling; and/or, 3) the presence of a groundwater mound originating from the storm water and/or contact water ponds. Regional groundwater flow direction is thought to be towards the southwest however site specific flow direction estimates are not well understood. The scope of this work plan is intended to provide additional information on local, shallow, groundwater flow directions and gradient. Seasonal fluctuations in groundwater depth have been assessed based on historic measurements taken at the site. These data indicate that there is an approximate 10 foot seasonal variation in groundwater elevations in site wells, with the maximum elevation (lowest depth to groundwater) generally occurring between January and April and minimum elevations generally occurring between July and October(Figure 3). Fi re 3: De th to Groundwater 1 ro d80 u �i 88 -x-MW3 ,too Mwe b 0 im uo Dab MONITORING WELL LOCATIONS AND RATIONALE The purpose of groundwater monitoring is to provide a means to measure compliance with the WDRs, and compliance with the State Antidegmdation Policy. The current Regional Board policy is to monitor the uppermost portion of the first aquifer underlying the site and allow characterization of background and down gradient groundwater quality within this uppermost portion. To accomplish this, an effective groundwater monitoring network will provide at least one clearly"up-gradient"well and at least two"down-gradient'wells and provide sufficient samples over time to allow comparisons between the wells. The site currently consists of a network of four shallow groundwater monitoring wells(MW-1 through MW-4)however, the depth and/or recovery of three of these wells (MW-1, MW-2, and MW-3) is inadequate for consistently monitoring groundwater quality and elevation at the Kellogg facility. This work plan therefore proposes the conversion of monitoring wells MW-1 through MW-3 to piezometers P-1 to P-3, respectively, for assessing groundwater elevations/gradient only, when water is present. Groundwater elevation and quality will be further assessed through the installation of three new wells (MW-1R through MW-3R), installed at the locations identified in Figure 2. Well Locations Due to the conversion of monitoring wells MW-1 through MW-3 to piezometers, three replacement wells (MW-1R,MW-2R,and MW-3R)will be installed. The proposed monitoring well locations were chosen based on known hydrogeologic conditions and planned future land use at the Kellogg facility. The new well 3