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' Quarterly Report - Fourth Quarter 2005 <br /> • SIERRA LUMBER <br />' 375 West Hazelton Avenue, Stockton, California <br />' 1.4. INTRODUCTION <br /> At the request of Mr Bob Long of Sierra Lumber,Advanced GeoEnvironmental, Inc (AGE) has <br />' prepared this quarterly report documenting the procedures and results for the fourth quarter 2005 <br /> ground water monitoring event performed at 375 West Hazelton Avenue, Stockton, California(the <br /> site), the report also documents September 2005 through November 2005 progress of the in-situ air <br />' sparging(IAS)and soil vapor extraction(SVE)recovery system The objectives of the site activities <br /> were to monitor dissolved petroleum hydrocarbon concentrations in ground water,to assess ground <br /> water flow direction and gradient, and to monitor the progress and effectiveness of SVE and IAS <br />' remediation at the site The site setting is illustrated on Figure 1 Site structures and monitoring well <br /> locations are depicted on Figure 2 <br />' This report has been prepared in accordance with guidelines issued by the California Regional Water <br /> Quality Control Board- Central Valley Region(RWQCB)for investigation of underground storage <br />' tank (UST) sites Analytical data for ground water and soil-gas vapor acquired to date is included <br /> in this report <br />' • The following is a brief summary of site assessment and SVE/IAS remediation activities performed <br /> at the site between 07 September 2005 and 23 November 2005 (Fourth Quarter 2005) <br />' • Between 07 September 2005 and 22 November 2005 -Continued SVE remediation utilizing <br /> on-site SVE wells VW-1, VW-2 and VW-6, extracted a total of approximately 30 pounds <br /> of petroleum hydrocarbons from the subsurface <br /> • 18 October 2005 - Monthly monitoring event performed on SVE/IAS remediation system <br /> • 22 November 2005-Monthly monitoring event performed on SVE/IAS remediation system <br />' • 23 November 2005 - SVE/IAS remediation operations were suspended as part of rebound <br /> response test <br />' • 23 November 2005 - Quarterly ground water monitoring event (Fourth Quarter 2005) <br /> performed at wells MW-1, MW-2, MW-74A, MW-4B and MW-6 - _ <br /> 2.0. GROUND WATER MONITORING AND SAMPLING PROCEDURES <br />' On 23 November 2005,ground water monitoring and sampling was performed at the site on selected <br /> ground water monitoring wells Ground water monitoring and sampling procedures for the site were <br />' outlined in Remedial Investigation/Feasibility Study Work Plan, dated 02 March 1999,prepared by <br /> • AGE and approved by the San Joaquin County Environmental Health Department (SJCEHD)by <br />' Advanced GeoEnvironmental,Inc <br />