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2.2 Quantities of Amendment Proposed and Assumptions Approximately 1.8 tons of zero-valent iron (ZVI) will be injected into four fractures per boring or a total of 7.3 tons of iron in each of three borings will be added. The ZVI will be mixed into a 1 biodegradable slurry comprised of potable water, guar gum, and an enzyme breaker. Section 4 discusses the nature of this mixture. ' 2.3 Timetable for Implementation ' Table 1 summarizes the timetable for implementation. The schedule for implementing this proposed pilot test/interim action evaluation is as follows: TABLE 1 Timetable for Implementation Task Deliverable Date Submit Work Plan and WDR Application June 29, 2004 ' Receive Work Plan/WDR Approval September 30, 2004 Obtain Permit for Injection Wells and two new monitoring wells October 15, 2004 Complete ZVI Injection November 30, 2004 Initiate Sampling December, 2004 ' Complete Four Quarterly Monitoring Events December, 2005 Assessment Report March 10, 2006 Note that the French Camp site is an active grain terminal. Truck traffic into the terminal peaks between September 1 and November 24 each year. Drilling activities would impede the terminal's ability to unload grain during this period, so the remediation system will be installed ' immediately after this year's busy period. The new monitoring wells will be installed within two weeks of determining the extent of fracturing and the monitoring schedule will be implemented. 2.4 Monitoring Scone and Schedule Laboratory Analyses Two monitoring wells will be added to the existing network well for the proposed pilot test. Figure 1 depicts the locations of the new monitoring wells, MW-9B and MW-1 OB. Monitoring of the pilot study will consist of laboratory analysis of groundwater samples collected from MW-313, MW-4B, MW-913 and MW-1013. Table 2, below, shows the constituents for which the samples are to be analyzed, the EPA analytical methods to be used and the sampling frequency for pilot test. These analyses shall be completed by a California State certified laboratory and shall follow standard EPA protocol. RACONTGRAMCC14Cargill\French Camp\Waste Discharge Application\supp info 6-29-04.doc 6