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Soil Vapor Extraction Remediation Report - Third Quarter 2011 Former OCAMPO PROPERTY 821 South Wilson Way, Stockton, California 1.0. INTRODUCTION AND SCOPE OF WORK At the request of Mr. Victor Aranda, Advanced GeoEnvironmental, Inc. (AGE) has prepared this quarterly remediation report for 821 South Wilson Way, Stockton, California (site). This report documents third quarter 2011 progress of a soil vapor extraction (SVE) recovery system at the site. Objectives of the site activities were to monitor the progress and effectiveness of SVE remediation at the site. The site setting is illustrated on Figure 1. Site structures and monitoring well locations are depicted on Figure 2. Site background information is summarized in Appendix A. This report has been prepared in accordance with guidelines issued by the California Regional Water Quality Control Board (RWQCB) - Central Valley Region for investigation of underground storage tank (UST) sites. 2.0. SOIL VAPOR EXTRACTION REMEDIATION SYSTEM Between 06 June 2011 and 22 August 2011, an SVE remediation system was operated at the site. On 04 February 2011 the natural gas-fired, thermal oxidizer SVE system was removed from the site and replaced with a granular activated carbon (GAC) adsorption vessel SVE system to continuously apply an induced vacuum to well VW-1. On 22 August 2011 the on-site SVE system was temporarily shut down for the performance of a vapor rebound test. SVE procedures for the site were described in AGE-prepared Interim Remedial Action Work Plan (dated 14 September 2009) and Interim Remedial Action Work Plan Addendum (dated 10 February 2010), and approved by the San Joaquin County Environmental Health Department (SJCEHD) by letter dated 08 October 2009. 2.1. SOIL VAPOR EXTRACTION REMEDIATION SYSTEM PROCEDURES The SVE remediation system consists of two 1,500-pound GAC adsorption vessels. The SVE system utilized a manifold network of two-inch and three-inch diameter, Schedule 40 PVC piping installed aboveground from SVE well VW-1 to an SVE moisture knockout vessel and 10-horsepower, maximum 250 standard cubic feet per minute (scfm) blower. In order to monitor efficiency of the SVE system: 1) a Magnehelic vacuum gauge and Dwyer DS-200 differential pressure sensor port was installed prior to the inlet (influent) of the SVE unit to monitor the air flow rate; 2) SVE air flow of the influent and effluent streams were monitored routinely for the presence of organic vapor using an organic vapor meter Advanced GeoEnvironmental, Inc.