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Quarterly Report - Fourth Quarter 2004 <br /> SIERRA LUMBER <br /> 375 West Hazelton Avenue, Stockton, California <br />' 1.0. INTRODUCTION <br /> At the request of Mr Bob Long of Sierra Lumber,Advanced GeoEnvironmental, Inc (AGE) has ^ <br /> tprepared this quarterly report documenting the procedures and results for the fourth quarter 2004 <br /> ground water monitoring event performed at 375 West Hazelton Avenue, Stockton, California(the <br />' site), the report also documents September through December 2004 progress of the in-situ air <br /> sparging(TAS)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 I Site structures and monitoring well <br /> locations are depicted on Figure 2 <br /> rDuring the second quarter 2004, one additional SVE well (VW-6) and one additional IAS well <br /> (AW-5) were installed to augment remediation efforts near the "core" area of petroleum <br />' hydrocarbon-impacted soil and ground water, newly installed wells AW-5 and VW-6 were <br /> incorporated into the SVE/IAS remediation system network on 03 June 2004 Results of the well <br /> installations were previously detailed in Quarterly Report-Fast&Second Quarters 2004,dated 03 <br />' . September 2004 <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 followingis a brief summ of site assessment and SVE/IAS remediation activities performed <br /> �� <br /> at the site between 23 September and 22 December 2004 (Fourth Quarter 2004) <br /> • Between 23 September and 22 December 2004 - Continued SVE remediation selectively <br />' utilizing on-site SVE wells(VW-1,VW-2 and VW-6),extracted a total of approximately 131 <br /> pounds of petroleum hydrocarbons from the subsurface <br /> • 25 October 2004 - Monthly monitoring event performed on SVE/IAS remediation system <br /> • 22 November 2004-Monthly monitoring event performed on SVE/IAS remediation system <br /> • 07 December 2004 - Quarterly ground water monitoring event (Third Quarter 2004) <br />' performed at wells MW-1, MW-2, MW-4A, MW-413 and MW-6 <br /> • 22 December 2004-Monthly monitoring event performed on SVE/IAS remediation system <br /> 1 ' <br />' Advanced GeoEnvironmental,Inc <br /> I <br />