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Advanced GeoEnvironmental, Inc. 15 November 2011 AGE-NC Project No. 02-0926 Mr. Lori Duncan San Joaquin County Environmental Health Department 600 East Main Street Stockton, CA 95202 Subject: Soil Vapor Extraction Rebound Test Report Former OCAMPO PROPERTY 821 South Wilson Way, Stockton, California Dear Ms. Duncan: At the request of Mr. Victor Aranda, Advanced GeoEnvironmental, Inc. (AGE) has prepared this report documenting the performance of a 24-hour soil vapor extraction (SVE) rebound test for the site located at 821 South Wilson Way, Stockton, California. The site location is depicted in Figure 1; site structures and former well locations are depicted in Figure 2. INTRODUCTION/BACKGROUND Between 28 December 2010 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 vessels SVE system to continuously apply an induced vacuum to well VW-1. 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. Based on SVE vapor remediation data collected between 06 June and August 2011 a total of 1,321 gallons or 8,258 pounds of hydrocarbons as gasoline have been extracted since startup of the soil vapor extraction system. On 22 August 2011 the onsite SVE system was temporarily shut down for the performance of a SVE rebound response test. The system was restarted for a period of 24-hours on 19 October 2011 and subsequently sampled on 20 October 2011 as part of the SVE rebound test. " `,111.1\\ k J •ttkiii. I CICI)11011,' 12.1 P)1 1111 /1, • 1