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Himanshu Mehta, P .E. 7 September 2007 Page 2 submitted a RAP for the site in July 2003 , which outlined a remedy which consisted of aggressive source area excavation (including an area with dense non-aqueous phase liquid [ DNAPL] ), pump and treat (P&T), and natural attenuation monitoring for the downgradient dissolved plume. Based upon the results of post-source removal groundwater monitoring activities and an evaluation of natural attenuation processes, Geosyntec recommended in the June 2006 monitoring report that the existing P&T system, originally installed in 2001 as an interim measure, be permanently shut down. The P &T system was designed to provide hydraulic capture of the source area. With the source area removed via the excavation, the continued operation of the system was no longer justified . Additionally, the natural attenuation evaluation included in the June 2006 report demonstrated that anaerobic degradation processes are actively degrading the CVOC plume. In consideration of the ongoing natural attenuation processes occurring at the site, the enhancement of these biological processes via the injection of an electron donor was proposed, and agreed to in concept by the FDEP in correspondence dated 2 August 2006 . A RAP Modification was submitted to the FDEP outlining the injection of an electron donor, Emulsified Oil Substrate (EOS®) , in May 2007 . PROPOSED SCOPE OF WORK The proposed scope of work includes the activities required to implement the RAP Modification, including the installation of the proposed injection wells, the purchase of 79 drums (55-gallon capacity) of EOS'�), and the injection of 526 to 675 gallons of a 10 percent E00 solution to each of the 77 proposed injection wells. Additionally, one, 2-inch diameter monitoring well will be installed on the Cathco, Inc. property, as requested by the FDEP, and sampled for volatile organic compounds. The remainder of this letter provides details regarding the proposed scope of work and a budget estimate to accomplish the work described herein. Phase 1 — Preliminary Activities Phase 1 includes project management for the entire project, as well as preliminary activities associated with project planning and management responsibilities, such as correspondence with IRC SWDD, FDEP , IRC Department of Health, IRC Sheriffs Department (injection wells are proposed on the firing range property) , subcontracting, invoice review, project coordination, and project administration . XR07I 92iCCR07069DOC engineeis I m: iPntjsts I innmooms