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i <br /> N <br /> COMMENTS AND CONDITIONS : <br /> 1 . The in-situ air sparging system (IAS) portion of the work plan is <br /> cancelled (See Disapproval section below) . <br /> 2. Submit an additional interim remediation feasibility work plan <br /> addendum specifically for the treatment and migration control of the <br /> dissolved contaminants in groundwater to EHD by June 20, 2005. <br /> 3 . Selection of soil samples for analyses must include EHD comment and <br /> agreement <br /> 4. Schedule work with EHD at least 48 hours in advance. Obtain permit <br /> and submit appropriate fee prior commencement of work. <br /> 5 . Install SVE wells by July 15, 2005, conduct SVE pilot test by July 25, <br /> 2005, <br /> REASONS FOR DISAPPROVAL OF THE WORKPLAN (H&S 25299. 373 <br /> subd. (C) (3) .) : <br /> 1 . In a telephone conversation with AGE, EHD agreed with AGE that <br /> IAS technology is premature due to the physical barrier of silt and clay <br /> layer above the groundwater table that may limit vapor recovery and <br /> contribute to migration of hydrocarbon contamination. EHD agrees <br /> with AGE that the IAS well installation and feasibility test portion of <br /> the work plan should be shelved. <br /> DATED May <br /> y 2 6. BY <br /> Cc: CRWQCB, Central Valley Region — James L.L. Barton, RG <br /> Cc: Advanced GeoEnvironmental, Inc. — Donna Sexton <br />