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Mr . Terry Southard 16 December 2008 Page 4 30 ft outside (west) of the western fence line, which according to IRC personnel and a CAD file provided by IRC ' s contractor remains within the IRC property limits (estimated to be approximately 50 ft from the western fence line) . Note that Geosyntec has assumed that no monitoring well installations will be required inside facility buildings . If this is the case , then additional budget under a separate cover may be required . • CONTINGENCY — if warranted by the sampling data from MW02 , Geosyntec will provide oversight of the installation of one permanent deep- screened monitoring well (approximate depth of 40 -ft BLS ) , in an effort to provide vertical delineation of sodium impacted groundwater in the vicinity of the area of highest currently observed sodium impacts using direct push technology (DPT) drilling techniques . Prior to well installation , Geosyntec will collect a groundwater sample from the interval from 35 - ft to 40 - ft BLS via DPT and field screen to verify that salinity/conductivity levels are below levels previously observed by Geosyntec . If the salinity/conductivity at a depth of 35 to 40 ft BLS exhibit elevated salinity/conductivity levels, the monitoring well will be installed to a maximum depth of 50 ft BLS . 3rd Mobilization • The FDEP requires that permanent monitoring wells be sampled after a minimum of 24 - hours after the installation has been completed . Therefore , groundwater samples will be collected from the four (plus one contingency deep -well , if needed) above-proposed permanent monitoring wells during the 3 d mobilization to the site to be scheduled at least 24 - hours after installation completion . • Collect a complete set of groundwater level measurements and perform groundwater sampling activities in accordance with FDEP Standard Operating Procedures . • To help address FDEP requirements, Geosyntec will complete the following in an effort to better understand the potential for migration of contaminants detected by Geosyntec to exist onsite during the site subsurface assessment . A calculation of the hydraulic conductivity in the surficial portion of the onsite aquifer will be estimated through slug testing in two of the installed shallow monitoring wells and in one deep monitoring well . • Provide oversight to a professional surveyor during the collection horizontal and vertical control data for all existing and proposed site monitoring wells and piezometers (twenty - two locations expected) . Note that the use of a licensed surveyor is based on requirements for site assessments conducted in accordance with Chapter 62 - 780 FAC . FR1329/XR08264. DOC