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Phase VI Report Memorandum -3- 14 May 1991 <br /> Nestle Foods Corporation <br /> 8. The Report presents contaminant concentrations maps. However, the Report does <br /> not present the contaminant concentrations plotted on the cross sections. These <br /> graphics are useful in presenting the vertical distribution of contaminants in <br /> the aquifer. <br /> 9. Figure 3-11 shows that there are two contaminant concentration highs in the A <br /> zone. The two highs have been attributed to sources on-site and the sewer line <br /> source to the south. However, an alternate interpretation may be that there is <br /> a preferential flow path between the two concentration highs. Due access <br /> restrictions on the Regal Almond property, monitor wells have not been installed <br /> in the area between these two concentration high areas. <br /> MEETING AGREEMENTS AND CONCLUSIONS <br /> Based on the discussions during the meeting on 25 April 1991 and the telephone <br /> conversation with Ms. Black, the following agreements and conclusions were made <br /> regarding the water level and quality data review in the Phase VI Report. <br /> 1 . Nestle will reduce the monthly ground water level monitoring to quarterly for <br /> all of the monitoring wells and any other wells currently being measured. <br /> 2. Nestle will consider preparation of the recommended graphics. <br /> 3. Nestle will coordinate the water level and water quality monitoring program to <br /> the same quarter, and will consider the recommended winter quarter (January <br /> measurements) for data analysis/interpretation. <br /> 4. Annual sampling of all of the monitor wells will be considered. This full <br /> sampling event may best be performed during the wet season (January) as these <br /> data may be the season to be analyzed/interpreted for both water levels and <br /> water quality. Presently, only the wells around the edges of the plume are <br /> sampled on a quarterly basis. <br /> 5. Due to access restrictions, Nestle been unable to install monitor wells on the <br /> Regal Almond property. If Nestle can obtain the access, they will consider the <br /> installation of monitor wells on this property to determine if there is a <br /> preferential flow path to the south in the A zone. However, Nestle wants to <br /> delay the installation of any additional wells until after June 1991. Any <br /> additional wells may be installed for the purposes of verification monitoring. <br /> 6. The Phase VI Report is the last report in the remedial investigation (RI) . Any <br /> additional data analysis/interpretation prepared by Nestle may best be presented <br /> in an annual report of the data collected during that particular year. The <br /> annual report must summarize the quarterly water quality data for that year and <br /> must present the analysis/interpretation of the water level and quality data. <br /> 7. Nestle will submit a work plan after the model has been calibrated. The work <br /> plan should be submitted by 1 September 1991 and is to include the installation <br /> of monitor wells to the south to define the lateral and vertical extent of <br /> contamination, the work needed to finalize the FS and to prepare for an annual <br /> reporting system. <br />