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Subsurface Investi ag <ion The design for Pond MB-2R was final as presented in the stability analysis. The stability analysis noted concerns should a HDPE liner be utilized. MCC has since decided to utilize a geotextile clay liner which resists leakage problems. The liner is to be placed in the ponds for added protection, but is not currently required by the regulations. 3. The statement regarding the dry conditions assumption is a standard disclaimer utilized by many engineering firms. MCC suggests however, that the refuse pile monitoring wells be utilizedras the higher load conditions at this location are "worst case" and the wells are in close proximity to the Phase III coal storage location. Roads Page 2.05-22 has been revised to state that the roads are gravel surfaced. 2. MCC shall not construct any cut slopes steeper than 1.SH:1 V. 3. For the ponds and road construction, the top 4" to 6" of the revegetated slopes of the existing MB-2 and MB-3 embankments will be recovered as topsoil and ultimately placed in the relocated main topsoil pile. After final volumes are figured, Table 47 on page 2.05- 45 will be revised. 4. MCC plans to seed the road embankments, etc. this fall. Successful seeding has been conducted by MCC in the past through late November, as long as snow cover is three inches or less. The statement referenced was existing and was not changed in this revision. No further response is required. Bond Estimate 1 A-E. The unit costs have been adjusted as suggested. 2. The dozer trap will now be set on grade, but will require 800 square feet of a 12" reinforced concrete push wall structure with footers. A cost estimate has been added for this concrete. No response required. All culverts have been listed individually in the revised bond calculation as suggested. Tasks 26a, 266, and 20A have been included in the revised bond calculation. -2-