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pertains to a maximum excavation at any one time of IS-20 acres with 0.5:1 side slopes that will require <br />backfilling and grading to reclamation slopes and installation of a compacted clay liner for water storage. <br />In conjunction with this estimated maximum disturbance, please clarify the maximum number of oil and <br />gas structures to be backfilled at any one time and the corresponding volume of material needed for <br />backfilling. <br />Also, the description of maximum disturbance will need to include the number of lineaz feet of exposed, <br />unlined pit face at a 0.5:1 configuration, the acreage to be re-topsoiled and re-vegetated, and the de- <br />watering costs for unlined pits of 60 acres and 6 acres in size. (Until such time that liner construction of <br />each reservoir is completed, tested, and approved for water storage by the Office of the State Engineer, the <br />Division will require a de-watering cost for the entire structure). Please provide a revised description of the <br />maximum disturbance expected with the criteria specified above. <br />6.4.5 EXIIIBIT E -Reclamation Plan <br />5. On page 5, the applicant specifies slope configurations for the side slopes of the south and north <br />reservoirs. As a point of clarification, slope configurations will need to conform to the requirements of <br />Rule 3.1.5(7) which states that pond or lake slopes shall be no steeper than a ratio of 2:1, except from 5 <br />feet above to 10 feet below the expected water line where slopes shall be not steeper than 3:1. Please <br />respond. <br />6. On page 5, the applicant specifies that a lazge berm above natural grade will be constructed as pazt of the <br />south reservoir and will impound more than 100 acre-feet of water. Please clazify the height and width and <br />number of lineaz feet of the proposed berm (or provide representative cross section), as well as the status of <br />the State Engineer's Office determination of whether such structure will be a jurisdictional dam or non- <br />jurisdictional structure. Please provide. <br />7. On page 5, the applicant indicates that the liner design for the 60 acre and 6 acre water storage ponds <br />will be submitted to the State Engineer's Office for approval. Please indicate the status of the SEO's <br />review. (Attached are review comments from the State Engineer's Office). <br />8. In confomrance with Rule 6.4.5(1), the applicant has specified on page 9 an estimated topsoil <br />replacement depth of 0.25-0.50 feet. The Division highly recommends the applicant reconsider the depth <br />of topsoil replaced to enhance the potential for good re-vegetation success. As an example, the applicant <br />might consider application of 12 to 18 inches of topsoil to provide an adequate seedbed for sustained re- <br />vegetation. <br />9. The aggressive mowing program for the eight (8) noxious weeds listed on page 10 will need to be <br />supplemented with herbicide treatments. Also, the Longmont Conservation District has expressed a strong <br />interest in a weed management strategy for tamazix at the File Pit 112 operation. Please provide a revised <br />weed control plan that includes specific herbicides, application rates, and application frequencies the 9 <br />weed species of concern. (Attached are review comments from the Longmont Conservation District). <br />10. The applicant has not provided a description of the construction and representative cross section of the <br />design of the compacted liner. Such information previously provided as part of Permit M-2003-090 may <br />be used if the applicant intends to use the same construction techniques and same liner design. Please <br />provide. <br />