SITE INFORMATION AND CORRESPONDENCE_FILE 1

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Mr. Timothy VanDomelen - 3 - 9 May 2008 J.R. Simplot, Lathrop, San Ji uin County 4 7. MRP Section C. 5 requires calculation of groundwater gradient and interpretation of groundwater flow direction, and a groundwater contour map updated annually. The Annual Report does not fulfill this requirement. An excerpt from a 2001 report by Geomatrix provided on page 2 of the text is not sufficient. Furthermore, this information must be provided by a California professional geologist. 8. Data that are collected outside the requirements of the MRP include the following: MRP requirement Simplot reporting Weekly measurement of freeboard — Daily process water pond Quarterly measurement of minimum Daily freeboard — stormwater pond Perchlorate analytical results not Quarterly perchlorate analysis in required groundwater from LP-1 Quarterly analysis of minerals and Monthly analysis of minerals and metals metals — stormwater pond Although we appreciate your inclusion of these data in your reports, it is J.R. Simplot's prerogative to maintain this level of data collection or fulfill the MRP's minimum requirements. 9. MRP Section C.7 requires analyses of minerals and metals in samples from the stormwater pond following significant rainfall events. Significant rainfall events should be highlighted or footnoted in data tables to document the rationale for sample timing. 10. MRP Section C. 8 requires weekly inspection of the synthetic pond liners. J.R. Simplot is compiling visual inspection logs as shown in pages 6-7f of Part Three of the Annual Report. For the sake of completeness, any additional work done during the year to verify pond integrity (e.g., periodic electronic liner surveys) should be documented in an appendix to the Annual Report. 11. MRP Section C.9 requires monthly measurement of field parameters for the vadose zone monitoring network. These data are presented in tables and charts on pages 83-100. However, field parameters and samples were not collected monthly for all lysimeters. For example, there was only one sampling event recorded for the North Pond North lysimeter in 2007 (p. 83). No explanation for the lack of sampling was provided in the text or tables. If lysimeters are dry or if there are other reasons why they are not sampled in compliance with the MRP, explanations must be provided in the Annual Report. 12. MRP Section C.9 requires quarterly sampling for TDS and sulfates in the vadose zone monitoring network. None of the vadose zone monitoring points were sampled quarterly in 2007, as shown in tables and charts on pages 83-100. If lysimeters are dry or if there are other reasons why they are not sampled in compliance with the MRP, explanations must be provided in the Annual Report.