SITE INFORMATION AND CORRESPONDENCE

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1readwelMolb Ms. Kitty Walker 31 August 2000 Page 2 recommendation that additional investigations (such as backhoe excavation) be conducted in the impacted area to define the source and extent of this contamination. In order to quantify the risk associated with purchasing this site the following actions should be taken: 1. The source and extent of contamination around borings 1513-6, 1513-8, and 1513-9 needs to be characterized to regulatory agency satisfaction. 2. The potential contaminant migration between the first and second aquifer needs to be characterized to regulatory agency satisfaction. 3. Soil and groundwater cleanup goals need to be established by the appropriate regulatory agencies in order determine which; if any, additional steps must be taken to achieve site closure. Groundwater wells have been monitored at the site since as early as 1991, and residual contaminant concentrations and degradation trends in groundwater are known. If the current concentrations are acceptable to regulatory agencies than a request for closure to the agencies should be made. If these concentrations are not acceptable,than achievable cleanup concentrations need to be established and appropriate remediation performed. The SJCEH must define acceptable remediation and closure goals. AREA 16 The UST identified as the primary source of petroleum hydrocarbon contamination has been removed and a soil vapor extraction(SVE) and sparging system has been installed and is operating under the oversight of SJCEH. The information regarding the SVE system that has been presented to us for review at this time includes: • The 7 February 2000 report titled Quarterly Report-November 1999, and • The 20 April 2000 report titled Quarterly Report- First Quarter 2000, which was received by us on 11 August 2000. The quarterly reports contained only basic information regarding the treatment system. In order to evaluate the treatment system and its ability to remediate the identified petroleum hydrocarbon contamination to concentrations acceptable to regulatory agencies, we request that the following documents and information be provided to us: 1. The report on the vapor extraction pilot test or feasibility study.