Common use of Current Activities Clause in Contracts

Current Activities. Site preparation activities, including grading, and cap reconstruction, have been ongoing since June, 1995 to prepare for Site development. The cap reconstruction was completed by the end of May 1996. As part of preparation work for the proposed development, additional fill was 5 363 [GEOMATRIX LOGO] placed in the low-lying areas of the Site to meet final grade requirements, and the thickness of the clay cap and the extent of the refuse fill were investigated. During this investigation, the refuse fill was found to extend beyond the previously identified limits based on soil borings drilled at various locations and test pits excavated on a grid pattern across the low-lying area. Based on this work, the lateral limit of refuse at the Site has been revised as shown on Figure 4. Details of the test pit program are included in Appendix B. The test pit and soil boring program also identified areas where the thickness and makeup of the clay cap did not meet the requirements for a final cover according to Article 8, Section 2581 of Chapter 15 of the CCR. To meet the requirements, a minimum of 1 foot of low-permeability material, such as Bay Mud, and a 1-foot protective layer has been placed across the former landfill areas. Work has been completed to extend the cap to cover the newly defined extent of refuse. In addition, a cut-off wall is in the process of being constructed at the outer boundaries of the refuse areas. The cut-off wall will consist of the low-permeability layer within the cap which has been keyed into the adjacent Bay Mud to minimize potential future migration of leachate from the landfill. This new cut-off wall, in addition to the existing cut-off wall along the eastern boundary of the site effectively isolates the refuse fill area. Schematic design drawings illustrating the cap construction and low-permeability "key" are contained in Appendix C. A report of this work will be submitted under separate cover. It should be noted that topographic contours presented on figures in this report are based on pre-construction site conditions. In addition, monitoring well locations were recently surveyed; figures in this report reflect the surveyed locations of the monitoring well▇. ▇▇veral monitoring well locations (specifically K-1, ▇-▇, ▇-▇, ▇-▇, ▇-▇, ▇-▇▇, ▇-2B, ▇-▇, ▇-▇, ▇-▇, ▇-▇, ▇-▇, ▇-▇▇, ▇-▇▇, ▇▇-2) were shifted from locations shown in previously submitted site plans to accurately reflect the surveyed positions.