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i <br /> S E C O R <br /> Ms Vicki McCartney <br /> May 26, 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), 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 8260B 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, total xylenes, DIPS, TAME, EtBE, ethanol, 1,2-DCA, and EDB were not detected <br /> above laboratory method reporting limits A summary of petroleum hydrocarbons and fuel <br /> oxygenates detected In site wells is presented below <br /> Humber of Detections Minimum Maximum <br /> Constituents above the MDL of the 1I Concentration in pg/L(Welt ID) Concentration In lig/L(Well ID) <br /> Total Samples <br /> TPHg 2 fib(MW-9) 120(MW-3) <br /> Benzene 0 — --- <br /> Toluene 0 — --- <br /> Ethylbenzene 2 0 61 (MW-3) 170(VW-1) <br /> Xylenes 0 --- -- <br /> MtBE 8 5 3(MWAR) 140(MW-3) <br /> TBA 2 3,500(MW-2R) 38,000(VW-1) <br /> DefindlOns_ <br /> MDL=Method Detection Limit <br /> pg/L=Micrograms per Liter <br /> According to the laboratory analytical report, petroleum hydrocarbons reported in the gasoline range <br /> for groundwater samples from wells MW-3 and MW-9 do not match the laboratory's gasoline <br /> standard In addition, the reporting limits were raised due to high level of analyte present in samples <br /> MW-2R 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-IR Groundwater was pumped fourteen times during the first quarter 2004 <br /> from the above-mentioned well using a vacuum truck, approximately 59,500 gallons of water were <br /> extracted Approximately 983,900 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 <br /> Groundwater removal data is included as Table 4 , <br /> I IConocoPhillips\Tosco Marketing1111931QMR11QMR04 Final doc <br />