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® EXHIBIT 6.70 Sou th Washington Ao Suite 3 GeosMtec 32780 Titusv4lle. FL 32780 consultants 321 -269_SB&) 327 -269-5813 v ._X ' ) 'v Ili k rnn 1 7 September 2007 Himanshu Mehta, P . E. Managing Director Indian River County Solid Waste Disposal District 1325 74th Avenue SW Vero Beach, Florida 32968 Subject: Proposal for Remedial Action Plan Modification Implementation and Off- Site Monitoring Well Installation for the South Gifford Road Landfill Site ID# 124400 Vero Beach, Indian River County, Florida Dear Mr. Mehta: Geosyntec Consultants (Geosyntec) is pleased to submit this proposal to the Indian River County (IRC) Solid Waste Disposal District (SWDD) for activities associated with (i) implementation of the May 2007 Remedial Action Plan (RAP) Modification (with supplemental information); and (ii) the installation of an off-site monitoring well at the Cathco, Inc. property, as requested by the Florida Department of Environmental Protection (FDEP). The proposal also includes the installation of a third bio-barrier consisting of 32 injection wells, and the injection of 30 drums of electron donor solution in the additional wells, as specifically requested/required by the FDEP during our meeting in Orlando on 11 July 2007 . Geosyntec has prepared this proposal as Attachment 1 under Work Order No. 12 for the Continuing Contract Agreement for Professional Services between IRC SWDD and Geosyntec, dated 10 August 2004 (amended 24 July 2007). The remainder of this proposal presents : (i) general project background; (ii) proposed scope of work; (iii) budget estimate; and (iv) schedule. PROJECT BACKGROUND Based upon the discovery of chlorinated volatile organic compounds (CVOCs) in groundwater samples collected at the site in 1999 , Geosyntec has implemented ongoing assessment, semi- annual plume monitoring, and remediation activities, as required by the FDEP . Geosyntec X R07 192,/C C R 07069 DO C engineers I eIwnli is I innovators