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Soil-Vapor and Groundwater Remediation Report - Second Quarter 2013 TOP FILLING STATION 101 South Wilson Way, Stockton, California 1.0. INTRODUCTION AND SCOPE OF WORK Advanced GeoEnvironmental, Inc. (AGE) has prepared this soil-vapor and groundwater remediation report for 101 South Wilson Way, Stockton, California (the site). The report documents the second quarter 2013 progress and effectiveness of an interim soil-vapor extraction (SVE) and groundwater extraction and treatment (GWET) remediation system(s). The site setting is illustrated on Figure 1 . Site structures and monitoring well locations are depicted on Figure 2. 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. SVE and GWET monitoring data acquired to date is included in the tables of this report. The following is a brief summary of SVE and GWET remediation activities performed at the site during the second quarter 2013: • Between 18 March and 17 June 2013 - Continued interim GWET remediation operations utilizing groundwater extraction wells EW-1, VW-1C, VW-2A and VW-3A. During this second quarter period, GWET interim remediation resulted in the extraction, treatment and discharge of 202,430 gallons of groundwater into the City of Stockton sanitary sewer system. Based on the amount of treated groundwater, an estimated 36.84 pounds of dissolved petroleum hydrocarbons was removed from the influent water stream. • 23 April, 23 May and 17 June 2013 - Monitoring events performed on both the GWET and SVE remediation system(s). • Between 18 March and 17 June 2013 - SVE interim remediation operations were conducted at the site selectively utilizing soil-vapor extraction wells VW-1 B,VW-2B, VW-3B and VW-4. During this period, SVE interim remediation resulted in the removal of approximately 175 pounds of total petroleum hydrocarbons from the subsurface. 2.0. INTERIM SOIL-VAPOR EXTRACTION REMEDIATION Between 18 March and 17 June 2013 (2"d Quarter), an SVE remediation system was continuously operated at the site, utilizing a regenerative vacuum blower-carbon canister SVE system to apply an induced vacuum to well VW-1 B, VW-2B, VW-36 and VW-4. SVE procedures for the site were previously described in the AGE-prepared Interim Advanced GeoEnvironmental,Inc.