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o On December 19, 1991, 80 liters of Treatek's microbial inoculant were applied to the sod The inoculant contained Arthrobacter species microorganisms with a culture population of 1 x 1013 cells/ml The inoculant was applied at a dilution rate of approximately 30 liters per 150 gallons of water utilizing a high pressure spray applicator Once applied, the soil bed was tilled to provide for complete mixing of the inocula Water was applied to the bed to provide a uniform moisture content of not less than 10% and the bed was recovered with plastic ' In conjunction with the application of the inocula, various sod samples were collected from the treatment bed's soils for lar head space screening The jar head space screening consisted of the collection of approximately one-half full stainless steel tubes of soils from the locations shown on ' Figure 4 and capping the tubes with aluminum foil The tubes were then allowed to sit for approximately 5 minutes after which an organic vapor analyzer's (OVA) (Foxborough Model 108A) detector tube was inserted through the aluminum foil to measure the volatile organic compound ' concentrations in the vacant portion of the tube Table 1 is a listing of the OVA readings collected from the locations shown on Figure 4 On December 23, 1991, the first of the bi-weekly treatment bed tilling operations was conducted Onsite tilling log sheets were maintained by TreaTek personnel and these log sheets are included in Appendix B Upon completion of the tilling, jar head space reading were again collected from the approximate locations shown on Figure 4 These readings, along with other lar head space ' readings collected periodically during the course of the remedial program, are shown on Table 2 Once the site activities were completed, the bed was recovered ' The bed was tilled on a bi-weekly basis for a six week period which ended with the last tilling conducted on January 28, 1992 Due to the seasonal rains, the bed was not uncoverd and several tilling periods were not completed in order to maintain a constant moisture level of the bed Four weeks into the projected six week remedial program (January 16, 1990), two preliminary confirmation composite soil samples were collected from four locations in each half of the bed The results from these two samples indicated that no Benzene, Toluene, Xylene or Ethylbenzene ' (BTX&E) compounds were present and that only the bed's north half composite sample exhibited detectable concentrations of TPH-G (18 mg/kg) The analytical data report for these two soil samples is enclosed as Appendix C This confirmation sampling was conducted to provide TreaTek with an indication as to the on-going effectiveness of the remedial process Based on these preliminary results, it was decided to conduct the confirmation soil sampling, as discussed in the remedial work plan, on January 30, 1992 which ended the six week projected ' remedial program duration The confirmation sod sampling consisted of the collection of one composite sod sample from each ' 50 cuyds of soil in the treatment bed The treatment bed was visually divided into twelve separate segments as shown on Figure 5 From each segment, a composite sample was collected from four distinct locations ' Each composite sample was collected by filling a stainless steel sample collection tube (2'x 60) one quarter full from soils at a depth of at least 16 inches beneath the bed surface from each of the four composite collection locations within the sample collection segment of the treatment bed Between each sample collection location, aluminum foil was placed over the tube ends to prevent compound volatilization Once the tube was filled, both ends were capped with aluminum foil and plastic end caps and secured with elastic tape The tubes were them labeled and placed in Ziplocke plastic bags and stored on ice for shipment to the analytical laboratory 6