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NOV-OB-'8? 1850 ILA: CO h11 NEL LRNL~ REC'L TEL N0~707-872-6106 p48@ P0B <br /> .. .. <br />Mr. Gordon Morgan - 4 - November 7, 1989 <br />' S1o ~e Stability (continued} <br /> 19. Please design slide toe channels at the base of Areas One, Three and Four <br />' to allow for runoff to pass quickly through these areas in order to minimize <br />infiltration and erosion. <br /> Veg etation Estabiishment <br />' 20 I <br />h <br />h <br />t <br />b <br />di <br />b <br />d <br /> , n areas w <br />ere <br />rees <br />ave <br />een <br />stur <br />e <br />or destroyed, please commit to <br /> establishing a replacement tree density at least equal 1n extent to the <br /> tree density of the ed3acent undisturbed areas, The Division will evaluate <br />' the tree-replanting success no sooner than during the summer of the fifth <br /> growing season, It will be Castle Concrete Company's responsibility to <br /> utilize whatever combination of irrigation, fertilizer, polyacrylamtde, <br />' and sun and animal screens necessary to achieve this goal. <br /> Oth er Concerns <br />' 21. The Division will be limiting all operations within the CAP Boundaries to <br /> reclemation only. As such, please commit to limiting all operations to the <br /> limit of Current disturbances. Exceptions to this are disturbances required <br />' to achieve stable slope configurations, such as filling in the inundated base <br /> of the Area One slide and cutting into the southern hill slide of the access <br /> road to achieve the 2:1 gradient, the disturbances necessary to construct <br />' the silt retention facility and realign the road at the old scale site, and <br /> disturbances necessary to install culverts and rip-rap. <br /> 22. In your "Boundary Modifications" table on page 21, I believe the entry under <br />' "Description" should read "B-3: Area 5". I also believe thet under <br /> "Comments", the entry should read "Contains A-5 from access road downhill". <br />' Financial Warranty <br /> 23. Please submit the following information to allow the Division to complete our <br />' _ estimates of the financial warranty increase necessary to comply with the <br /> August Board Order: <br /> a. The volume of material to be moved at each slide area, if there will <br />' be a net material gain or loss from any area, then the distance to the <br /> material source or disposal site should be addressed and the site <br />' located on the maps; <br /> b. The distance from the indtviduai slide areas to the plant growth <br /> medium stockpile located in the quarry; -- <br />1 <br /> c. The materials and methods to be used in construction of the silt <br /> retention facility and all slide toe channels; <br />' d. The volume of material necessary to construct the proposed sediment <br /> pond embankment, the material source location and distance, the <br />' embankment design specification, and channel protection and inlet and <br />outlet details; <br /> <br />