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t r i Mr. Horton Page 2 5. The operator is required to provide a more detailed implementation schedule of time frames for completion of specific activities for preconstruction, construction, and postconstruction during closure and postclosure maintenance. Board staff recommends the operator provide a bar-chart graphically depicting detailed monthly activities relative to a starting time. 6. Section I-7. 0 must address the requirement for a sign to be placed indicating where the closure and postclosure maintenance plans are kept and can be viewed by the public pursuant to 14 CCR 17767 (d) . The Site Security element must also state that the newspaper notification will be published 30 days prior to closure (14 CCR 17767 (x) ) . 7. Section I-6. 0 states that existing gas probes will not be incorporated into the postclosure monitoring plan. More information is needed as to how the probes will be decommissioned and disposed in accordance with 14 CCR 17772 . 8 . The operator is requested to elaborate on reporting requirements pursuant to 14 CCR 17774 (c) . Specific items of concern include 14 CCR 17774 (c) (1) (C) (5) & (6) for pass/fail criteria for sampling and testing methods used to achieve final cover design and corrective procedures in the event of test failure. Furthermore, please elaborate on construction quality assurance documentation requirements specified in 14 CCR 17774 (d) . 9 . It is apparent to Board staff that parts of the construction quality assurance (CQA) plan was directly quoted from 14 CCR 17774 . The regulation merely states minimum requirements for construction quality assurance. We question the validity of this approach and have concerns that site specific factors for the Harney Lane landfill have not been incorporated into the CQA design. 10. The 1987 Kleinfelder Report (Attachment 2 of Appendix C of the Closure Plan) indicates that borrow soils for the clay barrier layer consist primarily of sandy silts to medium sands which are classified in the boring logs as SM, ML, SP, and SW using the Unified Soil Classification system (USCS) . There is a minor amount of SC and CL materials present. However, these materials represent only about ten percent of the borrow material. 23 CCR, Chapter 15, Section 2541 requires that soils used for clay liners (including caps) contain at least 30 percent material passing the No. 200 U.S. Standard sieve and be in the SC, CL or CH classes of the USCS. Therefore, the