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Tosco Corporation a subsidiary of Phillips Petroleum Company 4 Tosco Station#11193,3202 West Hammer Lane,Stockton,CA March 7,2002 • Occupational Health and Safety Administration (Cal-OSHA) "Hazardous Waste Operations and Emergency Response" guidelines (CCR Title 8, Section 5192) The Health and Safety Plan was reviewed by field staff and contractors prior to the beginning of field operations at the site DPE Summary SECOR performed DPE at the site on November 26th through November 30th, 2001 DPE was performed using a 20 hp liquid ring vacuum pump connected to a H2 Oil Thermal Oxidizer(Therm-ox) for treatment of the extracted soil vapors prior to discharge to the atmosphere DPE tests were performed on well MW-1R for 3 hours, MW-2R for 3 hours, VW-1 for 2 hours, and simultaneously on wells MW-1R, MW-2R, and VW-1 for 92 hours The total DPE time was approximately 100 hours Physical and chemical parameters including applied vacuums, groundwater, soil vapor total system and well field extraction flow rates, total depth to groundwater, and flame ionization detector(FID) readings were monitored throughout the DPE event Vacuum gauges were placed at nearby monitoring wells in order to monitor the pressure gradient induced by each respective extraction well DPE test data is summarized in Table 1 During each day of testing, influent vapor samples were collected from the DPE system influent vapor stream Groundwater samples were collected from monitoring wells MW- 1R, MW-2R, and VW-1 on the first day of the test, November 26 h, 2001 and on the last day of the test, November 30th, 2001 Air and water samples were analyzed for total petroleum hydrocarbons as gasoline (TPHg), benzene, toluene, ethylbenzene, xylenes (BTEX compounds), and methyl tert-butyl ether(MtBE) by EPA Methods 8015 and 8020 Results of these analyses are presented in Tables 2 and 3 Certified laboratory analytical reports and chain-of-custody documentation data are presented in Attachment B DPE RESULTS During the 3-hour DPE event for well MW-1R, the applied vacuum ranged from 24 inches of mercury(in of Hg ), to 25 in of Hg , vapor extraction flow rates ranged from 19 62 cubic feet per minute (cfm) to 23 98 cfm Groundwater elevations for observation wells MW-2R and MW-8 decreased by 0 12 feet, well VW-1 decreased by 0 08 feet, well MW-5 decreased by 0 04 feet, and well MW-9 decreased by 0 01 feet FID readings collected from the vapor extracted ranged from 40 parts per million by volume (ppmv) to 50 ppmv Applied vacuum, vapor extraction flow rates, groundwater extraction flow rates, and influent FID readings are presented in Table 1 During the 3-hour DPE event for well MW-2R, the applied vacuum was 25 in of Hg, vapor extraction flow rates ranged from 10 90 cfm to 12 47 cfm Groundwater elevations for wells MW-1R and MW-9 decreased by 0 02 feet, well VW-1 decreased by 0 11 feet, well MW-5 decreased by 0 14 feet, and well MW-8 decreased by 0 08 feet FID readings collected from the vapor extracted ranged from 1,000 ppmv to 7,000 ppmv Applied