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S E C 0 R <br /> Ms Vicki McCartney <br /> November 2, 2004 <br /> Page 2 <br /> Groundwater samples were submitted for analysis of total petroleum hydrocarbons as gasoline <br /> (TPHg), benzene, toluene, ethylbenzene, and total xylenes (BTEX), fuel oxygenates methyl tertiary <br /> butyl ether (MtBE), ethyl tertiary butyl ether (EtSE), di-isopropyl ether (DIPE), tertiary amyl methyl <br /> ether (TAME), tertiary butyl alcohol (TBA), and ethanol, and lead scavengers 1,2 dichloroethane ; <br /> (1,2-DCA) and 1,2-dibromoethane (EDB) by EPA Method 8260E SECOR's procedures for <br /> groundwater sample collection are presented in Attachment 1 The certified laboratory analytical <br /> report, chain-of-custody documentation, and field data sheets are included in Attachment 2 <br /> Toluene, xylenes, ethylbenzene, DIPS, TAME, ethanol, 1,2-DCA, and EDB were not detected above <br /> laboratory method reporting limits (MRLs) A summary of petroleum hydrocarbons and fuel <br /> oxygenates detected in site wells is presented below <br /> Number of Detections Minimum Maximum <br /> Constituents above the MRL of the 11 Total Samples Concentration in pg/L(Well ID) Concentration in lig/L(Well ID) <br /> TPHg 1 --- 520(MW-3) <br /> Benzene 1 --- 2 5(MW-3) <br /> Toluene 0 --- --- <br /> Ethylbenzene 0 -- <br /> Xylenes 0 — --- <br /> . MtBE 8 1 9(MW-8) 670(MW-3) <br /> EtBE 2 0 52(MW-6) 31 (MW-2R) r <br /> TBA 8 7 5(MW-8) 47,000(VW-1) ' <br /> Definitions <br /> MRL=Method Reporting Limit <br /> pg/L=Micrograms per Liter <br /> r <br /> The certified laboratory analytical report contained no comments associated with the analysis of the <br /> samples Groundwater analytical data are included in Tables 1 and 3, and are shown on Figure 2 <br /> REMEDIAL ACTIVITIES <br /> Interim remediation by groundwater batch extraction began in August 2000 for the purpose of plume <br /> migration control Approximately 1,017,400 gallons of groundwater has been extracted since interim <br /> remediation began in August 2000 Water was periodically hauled by Onyx Industrial Services, a <br /> certified hazardous waste hauler, to ConocoPhillips' Refinery in Rodeo, California for disposal <br /> Groundwater batch extraction activities were discontinued following the June 8, 2004 event upon <br /> activation of the OS system on-site on May 25, 2004 Groundwater removal data are included in <br /> Table 4 A summary of the completion of OS system installation and start-up activities is included <br /> under a separate report cover <br /> IConocoPhi[Aps\Tosco Markebng1111931QMR13QMR04 Final doa <br />