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TIME OIL- LOCKEFORD, CA SECOR Project No. 7GO05-001-02 <br /> E. Initial Site Entry Has this been performed by SECOR? (YES/NO): Yes If YES, describe: <br /> wPn Instattatin QM&sf on site wells conducted SYF,& SpargP,Feasibility Test <br /> F. Interior Work& Confined Spaces <br /> Will any work be done inside an enclosure,building,or confined space? (YES/NO): NO . If YES,describe: <br /> G. Excavation and Trenching <br /> Excavation and/or trenching will be done on this site? (YES/NO): YES--- . If YES, describe including proposed <br /> dimensions and if entry may be required(including mounting tanks for vacuuming, purging, sampling, etc.): <br /> Excavation and Tlgnching�)I be completed at the site during the future phases of work which include the <br /> Installation I in f the remediationm <br /> Attachment 12 will be completed for excavations of any depth and requiring entry. <br /> H. Landfills and Other Areas Potentially Containing Explosive Gas or Vapor <br /> Site is in an area containing a current/former landfill, or the geology contains known/suspected pockets of explosive <br /> gas/vapor?(YES/NO)_ NO . If YES, describe: <br /> I. Time of On-Site Work <br /> Work will be done during daylight hours? (YES/NO): YES . If NO,describe: <br /> J. Hazardous Materials <br /> Will any hazardous materials(chemicals)be used on-site? (If so, include MSDS's under Attachment 11.) (YES/NO): <br /> NQ _. If YES, describe: <br /> K. Background Information (e.g.,historical operations and environmental investigations): <br /> Multiple environmental assessments and feasibility testing have been,completed at the site. The primary _ <br /> Contaminants of concern are BTEX,MTBE and TPH-gasoline. The„sgllrce of contamination was from three separate <br /> gasoline underground storage tank pit locatim. Replacement of 3,underMund storage tanks (USTs) in 1991. Drilling <br /> of 26 soil borings between 1992 and 1995. Installation of eight mil yapor inlet/extraction wells (W-1 through W-g) <br /> between 1992 and 1993. Installation of 10(7,vW-1 through MW-10)groundwater_monitoring wells between 194 and <br /> 1995. Performance of soil vapor extraction SM tests in 1992 and 1998._Groundwater monitoring and sampling since <br /> the first quarter of 1995. <br /> -5- <br />