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S E C ® R <br /> Ms Vicki McCartney <br /> January 29, 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 (EtBE), dl-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 82608 Field and laboratory procedures <br /> for sample collection are presented in Attachment 1 The certified laboratory analytical report, chain- <br /> of-custody documentation, and field data sheets are included in Attachment 2 <br /> Benzene, toluene, ethylbenzene, DIPS, TAME, EtBE, ethanol, 1,2-DCA, and EDB were not detected <br /> in samples from any of the wells A summary of petroleum hydrocarbons and fuel oxygenates <br /> detected in site wells is presented below <br /> 4 <br /> Number of Detections Minimum Maximum <br /> Constituents above the MDL of the 11 Concentration in pg/L(Well ID) Concentration in pg/L(Well ID) <br /> Total Samples <br /> TPHg 3 130(MW-7) 1,600(MW-3) <br /> Benzene 0 --- --- <br /> Toluene 0 --- --- <br /> Ethylbenzene 0 - <br /> Xylenes 1 3 5(MW-4) --- <br /> MtBE 8 4 5 (MW-5) 670(MW-2R) <br /> TBA 3 150(MW-1R) 79,000(VW-1) <br /> Definitions <br /> MDL=Method Detection Limit <br /> pg/L=Micrograms per Liter <br /> d <br /> According to the laboratory analytical report, the petroleum hydrocarbons reported in the gasoline <br /> range for samples MW-3, MW-7, and MW-9 do not match the laboratory's gasoline standard In <br /> addition, the reporting limits were raised due to high level of analyte present in samples MW-2R, <br /> MW-3, and VW-1 Groundwater analytical data are included in Tables 1 and 2, and are shown on <br /> Figure 2 <br /> INTERIM REMEDIAL ACTIVITIES <br /> Interim remediation by groundwater batch extraction began in August 2000 for the purpose of plume <br /> migration control Interim remedial activities conducted this quarter included the periodic pumping of <br /> groundwater from MW-1 R Groundwater was pumped thirteen times during the fourth quarter 2003 <br /> from the above-mentioned well using a vacuum truck, approximately 38,480 gallons of water were <br /> extracted Approximately 958,180 gallons of groundwater have 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 s <br /> Groundwater removal data is included as Table 4 <br /> Fy <br /> f <br /> 1ConocoPhillips\Tosco Marketing1111931oMR140MR03 Final doe { <br />