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Quarterly Report - First and Second Quarters 2004 SIERRA LUMBER ' 375 West Hazelton Avenue, Stockton, California ' 1.0. INTRODUCTION At the request of Mr Bob Long of Sierra Lumber, Advanced GeoEnvironmental, Inc (AGE) has ' prepared this quarterly report for 375 West Hazelton Avenue (the site), Stockton, California The r objectives detailed in this quarterly report were to monitor for the presence ofpetroleum hydrocarbon ' in ground water,to assess ground water flow direction and gradient and to monitor the operation and effectiveness of soil vapor extraction(SVE)and in-situ air sparing(IAS)remediation at the site This report has been prepared in accordance with guidelines issued by the California Regional Water ' Quality Control Board-Central Valley Region(RWQCB)for investigation of underground storage tank(UST)sites Analytical data for ground water acquired to date is included in this report The site setting is illustrated on Figure I Site structures and monitoring well locations are depicted on ' Figure 2 As part of the rebound response test conducted between 29 December 2003 and 28 January 2004, ' the First Quarter 2004 ground water monitoring event was performed at the site on 28 January 2004, the results of the 28 January 2004 ground water monitoring event were previously reported in Quarterly Report -Fourth Quarter 2003, dated 26 February 2004 One additional SVE well (VW-6) and one additional IAS well(AW-5)wereinstalled at the site on 13 May 2004 to augment remediation efforts near the "core" area of petroleum hydrocarbon- impacted soil and ground water Results of the well installations are detailed in this report The following is a brief summary of site assessment and SVE remediation activities performed at ' the site between 28 January and 02 July 2004 (First/Second Quarters 2004) ' - Between 28 January and 22 June 2004 - Continued SVE remediation selectively utilizing on-site SVE wells (VW-1 through VW-6 and MW-4A), extracted a total of approximately 108 pounds of petroleum hydrocarbons from the subsurface ' - 23 February 2004-Monthly monitoring event performed on SVE/IAS remediation system -0 10 March 2004-Monthly monitoring event performed on SVE/1AS remediation system Due - - - to repairs of the underground remediation piping system and the ball-valve at MW-4A, the SVE/IAS remediation system was temporanly shut-down on 10 March 2004 20 April 2004 - Repairs to SVE/IAS remediation system completed, the SVE/IAS Iremediation systemt was re-started on 20 April 2004 27 April 2004 - Monthly monitoring event performed on SVE/IAS remediation system Advanced CeoEnvironmental,Inc I '