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r r t \um Mr. Robert McClellon October 31,2007 Page 3 • Groundwater samples were labeled and placed in an ice chest with ice.The ice chest was shipped to EMAX analytical laboratory in Torrance, California,under proper chain-of-custody procedures for dissolved metals(CAM 17)by U.S. Environmental Protection Agency(EPA)Method 6010/6020/7470 and TDS by EPA Method 160.1. Excess Passive Soil Vapor Extraction Trench Removal Activities During the week ending September 28, 2007,the excess passive soil vapor extraction trench materials were removed from the site. Ms.Natalia Subbotnikova of SJCEHD was present during the mandatory portion of these activities. The large soil stockpile was loaded onto 64 trucks and transported under Uniform Hazardous Waste Manifests to Kettleman Hills Facility, a Class I facility, in Kettleman City,California. Copies of the Uniform Hazardous Waste Manifests are provided in Attachment 2.The small soil stockpile and the tank soil stockpile were loaded onto 15 trucks and transported to Vasco Road Landfill,a Class 11 facility, in Livermore, California.The concrete debris stockpile was loaded onto five trucks and transported to a concrete recycling facility(either F.T.G. Construction Materials,Inc., in Lodi,California,or A Plus Materials Recycling, Inc., in Stockton, California). The wood debris consisted of three sections of large timbers,approximately 3 feet in diameter(one approximately 20 feet in length, one approximately 17 feet in length and the other approximately 7 feet in length),covered in steel sheeting.The steel sheeting was removed from the large timbers prior to loading the timbers onto trucks. In addition,Ms. Subbotnikova requested that the existing vegetation along the western boundary of the site be removed.The wood debris and the vegetation were loaded onto two trucks and transported to Vasco Road Landfill in Livermore,California.The steel sheeting was loaded onto one truck and transported to Sims Hugo NEU in Stockton,California.Padilla's Tire Recycling Service of Linden, California,one of the three tire recycling facilities recommended by Ms. Subbotnikova,removed and transported 20 tires to their facility on September 28,2007. RESULTS Soil Vapor. The methane concentrations measured during the quarter in the gas-migration monitoring probes for VW-2, VW-3,VW-4,VW-7S,VW-7D,VW-8S,VW-8D, VW-9,and VW-10 were less than or equal to 0.1 percent.The methane concentration for the remaining vapor probes ranged from 0 to 0.2%in VW-1, 0.4%to 1.4% in VW-5S, 1.0%to 2.9%in VW-5D, 3.8%to 4.2%in VW-6S,and 0.9% to 1.8%in VW-6D. The methane concentration in the vapor extraction wells ranged from 1.6%to 5.7%in EW-1 and 8.4%to 11.8%in EW-2.The methane concentrations in the passive vents ranged from 0.2%to 8.3%in VP-1, 3.9%to 9.6%in VP-2,0.2%to 9.6%in VP-3, and 3.7%to 10.1%in VP-4. The oxygen concentration measured at all sample locations during the quarter ranged from 0%to 22.2%.The carbon dioxide concentration at all sample locations measured during the quarter ranged from 0.1%to 26.7%.The results for each probe,each extraction well, and each passive vent are summarized in Table 1. K:\Wprocess\25532\WorldEnterprise\Quarterly Rpt\2007\3Q07\103107.doc