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Interim Remediation Work Plan - March 2009 NOMELLINI CONSTRUCTION COMPANY 1045 West Charter Way, Stockton, California I 1.0. INTRODUCTION On behalf of Mr. Dante Nomellini of Nomellini Construction Company, Advanced GeoEnvironmental, Inc (AGE) has prepared this work plan for interim ground water and soil remediation at 1045 West Charter Way, Stockton, California (site). The location of the site is illustrated on Figure 1. A plan of the site is illustrated on Figure 2. This work plan was directed by the San Joaquin County Environmental Health Department (SJCEHD) letter dated 23 January 2009 (Appendix A) and was prepared in accordance with California Regional Water Quality Control Board - Central Valley Region (Regional Board) guidelines for the investigation of underground storage tank (UST) sites. A soil vapor extraction (SVE) system operated on the site from July 2000 to March 2001 in conjunction with in-situ air sparging (IAS); with minor SVE operation in February, June and December 2004. Hydrocarbons were not detected in soil vapor samples during active remediation between January 2005 and May 2005 . Site background information is provided in Appendix B. 2.0 PRINCIPLES OF DUAL-PHASE EXTRACTION Recovery of hydrocarbons from the saturated subsurface is often difficult due to the fact that hydrocarbons can exist in the vapor-, dissolved- and liquid-phase. Liquid-phase hydrocarbons both dissolve into ground water, adsorbed and/or vaporize into pore spaces between sediment grains. Free-phase petroleum product was regularly observed, measured and remediated manually from the site. Petroleum product was recently measured in the deep vapor wells (VW- 1). Previously, free product was measured with a maximum thickness of 0.9 feet. Dissolved phase hydrocarbons also vaporize into pore spaces until equilibrium is established between the liquid, dissolved, and vapor phases. Remediation methods effective in treating one phase maynot be efficient for the remediation of other hydrocarbon phases. High-vacuum (vacuum pump capable ofproducing 25 to 30 inches ofinercury) dual-phase extraction systems are capable of removing both hydrocarbon vapors and, depending on soil type and stratification, liquid and dissolved phase hydrocarbons. Extracted vapors may be treated by incineration in catalytic oxidation, thermal oxidation or by carbon bed filtration. Co-produced ground water may be treated on site and discharged into either, the sanitary sewer, storm drain system and/or disposed. Alternatively, impacted ground water may be stored on site in a temporary tank for later recycling. The advantages and disadvantages of DPE are discussed below. Advantages: High vacuum dual phase extraction using oxidation can quickly remediate petroleum hydrocarbons present in the vadose zone, capillary fringe and Advanced GmEnviroamenlal, Inc.