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Geosyntec ° 0770 South Washington Avenue, Suite 3 <br /> Titusville, Florida 32780 <br /> PH 331 695880 <br /> consultants FAX 331 .269. 58 13 <br /> ll L www.geosynlec.mm <br /> 2 January 2008 <br /> Janet B . Dunlap, P . E. <br /> Indian River County Capital Projects <br /> 184025 1h Street <br /> Vero Beach, Florida 32960 <br /> Subject: Cattle Dip Site Interim Source Removal <br /> 9255 93rd Street on County Road 510 <br /> Parcel #31392600000002000001 . 0 <br /> Vero Beach, FL <br /> Dear Ms . Dunlap: <br /> Geosyntec Consultants (Geosyntec) is pleased to submit this fee proposal to Indian River County <br /> (IRC) for professional services associated with additional soil assessment and the <br /> implementation of Interim Source Removal (ISR) activities to address arsenic impacts at a <br /> historic cattle dipping vat located at the referenced property. This fee proposal has been prepared <br /> in accordance with the negotiated contract between Geosyntec and IRC Solid Waste Disposal <br /> District. <br /> PROJECT UNDERSTANDING <br /> Geosyntec performed an initial assessment of the referenced property in January 2007 to assess if <br /> former cattle dipping operations had an adverse impact on the soil and groundwater. The results <br /> from the initial investigation demonstrated that arsenic is present in vadose zone soils at <br /> concentrations exceeding the residential soil cleanup target level ( SCTL) of 2 . 1 milligrams per <br /> kilogram (mg/kg) and in the groundwater at concentrations exceeding the groundwater cleanup <br /> target level (GCTL) of 10 micrograms per liter (µg/L) and the natural attenuation default criteria <br /> (NADC) of 100 pg/L. <br /> XR07084/CCR08003.DOC <br /> ciigincers I scientists I innovators <br />