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,f r1 RS E C 0 Ms Vicki McCartney October 21, 2003 Page 2 Groundwater samples were submitted for analysis of total petroleum hydrocarbons as gasoline (TPHg), benzene, toluene, ethylbenzene, and total xylenes (BTEX), fuel oxygenates methyl tertiary butyl ether (MtBE), ethyl tertiary butyl ether (EtBE), dl-isopropyl ether (DIPS), tertiary amyl methyl ether (TAME), tertiary butyl alcohol (TBA), and ethanol, and lead scavengers 1,2 dichloroethane (1,2-DCA) and 1,2-dibromoethane (EDB) by EPA Method 82606 BTEX, DIPS, ethanol, 1,2-DCA, and EDB were not detected in samples from any of the wells Field and laboratory procedures for sample collection are presented in Attachment 1 Field data sheets showing sampling protocol are presented in Attachment 2 A summary of laboratory data is listed below Number of Detections Minimum Maximum constituents above the MDL of the 11 Concentration in Vg/L(Weil ID) Concentration in pg/L(Well ID) Total Samples TPHg '6� y Y^ a 01 55(MW-4) 2500(MW-2R) Benzene 0 --- Toluene 0 -- Ethylbenzene 0 - --- Xylenes 0 -- --- MtBE 9 2 8(MW-8) / 3,700(MW-9) i TBA 41 -E" 230(MW-6) 64 000(VW-1) . TAME 1 r --- 31 (MW-9) Definitions MDL=Method Detection Limit pg/L=Micrograms per Liter According to the laboratory analytical report, the hydrocarbon reported in the gasoline range for samples MWAR, MW-2R, MW-3, MW4, and MW-9 does not match their gasoline standard In addition, the reporting limits were raised due to high level of analyte pre ent in samples MW-3, MW- 5, and MW-9 Groundwater analytical data are included in Tables 1 and ,and are shown on Figure 2 The certified laboratory analytical report and chain-of-custody documentation are also included in Attachment 2 INTERIM REMEDIAL ACTIVITIES Interim remediation by groundwater batch extraction began in August 2000 for the purpose of plume migration control Interim remedial activities conducted this quarter included the periodic pumping of groundwater from MWAR Groundwater was pumped twelve times''during the third quarter 2003 from the above-mentioned well using a vacuum truck, approximately 58,400 gallons of water were extracted Approximately 865,500 X-allons of groundwater have been extracted since Interim remediation began in August 2000 Water was periodically hauled by Onyx Industrial Services, a certified hazardous waste hauler, to ConocoPhillips' Refinery in Rodeo, California for disposal ' Groundwater removal data is included as Table 4 IConocoPhilhps\Tosco Marketing1111931QMRQQMR03 Final doc "