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system has proven itself in past projects to greatly increase the areal dissipation of <br /> fresh air into the subsurface. Once again the goal here would be to transfer as <br /> much fresh air as possible into the oxygen depleted water table within the <br /> contamination plume. <br /> 1.4.4 Back filling of the excavation with a 1.5" to 2"rock base up to one foot above the <br /> water table. Then a Class 2 baserock up to within 4" of the final surface grade. <br /> Finally finishing off the surface with a impermeable asphaltic cap. <br /> 2.0 REMEDIAL TASK SUMMARY <br /> 2.1 REMEDIAL ACTION TASKS PROPOSED <br /> The following tasks would be completed as previously described in Section 1.4. <br /> Task 2.1.1 <br /> Underground Service Alert (USA) would be contacted and all underground utilities, pipelines or <br /> any other engineered systems located to the best of their and our abilities. Site security would be <br /> placed on sight via chain-linked fencing, barricades and flashing caution markers. <br /> Task 2.1.2 <br /> Mobilization of a backhoe and front-end loader to complete the soils manipulations. <br /> Layout of the proposed excavation area and grading of the area where the stockpiled soil will be <br /> located. Spreading of 6-mill poly plastic for containment. <br /> Task 2.1.3 <br /> Starting at the far western end of the proposed excavation begin removing contaminated soil <br /> down to the capillary fringe and then an additional foot or two to make the maximum effort to <br /> remove the source of the contamination. This task would be done to the farthest extent possible <br /> and as far as necessary to create and develop the greatest impact towards removing the <br /> contamination. As the soils are removed the front end loader would then pickup the <br /> contaminated soil and relocate it onto the 6-mill plastic. The excavation would continue towards <br /> the east and cover as much area as possible to the north and south. There are limitations to the <br /> north due to Durham Ferry Road and a fiber optic cable that is parallel to the road way. To the <br /> south is George's Service Store. <br /> Based on the analytical data and previous soil borings at the site the overall anticipated volume <br /> of soil that is to be removed is 350 to 500 cubic yards. <br /> Tasks 2.1.4 <br /> A full set of soil and water samples would be collected as directed by the geologist in charge and <br /> with the consent of the SJCPHD. This task could be completed as one event at the end of the <br /> DEL-TECH Page 3 8/15/00 <br />