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with Rule 4651, air monitoring will be conducted on-site during the construction of the soil cell with a FID. During air monitoring activities, soils will be screened with the FID. Screening results and a summary of soil cell construction activities will be logged and submitted with the fourth quarter 1996 monitoring report. During the excavation activities of February 1995, approximately ten cubic yards of clean overburden soil was stockpiled separately. This soil will be used to fill an area of depression that has developed at the site of the excavation. In addition, temporary fencing that had been installed around two sides of the stockpile will be removed and Smith Technology personnel will clear the site of weeds and any miscellaneous materials onsite. This would include the removed fencing, a couple of burned drums, and a tree trunk that was discovered underground during the excavation. The soil aeration cell will be sampled during regularly scheduled quarterly monitoring activities to monitor the progress of the soil aeration. Four samples will be collected for every one hundred cubic yards of stockpiled soil and composited by the laboratory. Samples will be analyzed for total petroleum hydrocarbons as gasoline (TPHg), benzene, toluene, ethylbenzene, and xylenes (BTEX) and results will be included in the quarterly monitoring report. PROPOSED SCHEDULE OF ACTIVITIES Smith Technology proposes to begin construction of the soil aeration cell on approximately November 5, 1996, with the approval of the PHS/EHD. The soil cell will not be constructed until the additional subsurface investigation is completed. The subsurface investigation will begin as soon as all access agreements are obtained from relevant parties. All agreements should be received within the next two weeks. If there is a difficulty in obtaining access agreements, Smith Technology will proceed with construction of the soil aeration cell in November 1996. w:ll4326\1mers\solcel.doe 2 • SMTN