2023-05-25_PERMIT FILE - M2022048 (9)

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ENVIRONMENT, INC. PAGE 7 L.G. EVERIST, INC.-WEST FARM RESERVOIR ADEQUACY RESPONSE 01 MAY 23, 2023 Page 23 has been revised by removing this text. A copy of the revised Exhibit E - Reclamation Plan is enclosed. 19) Note #6 on the provided bank armoring plan states that the armoring will be covered with a 6"layer of growth medium and seeded, however the reclamation plan and text on P114 calls for 1 T-12"of topsoil to be replaced prior to seeding. Please revise Note #6 for consistency as needed. Thanks for pointing this out. Note #6 has been revised to match the 10-12 inches of topsoil cover. A copy of the Bank Armoring Plan with a revised Figure 1 is enclosed. 20) DRMS notes that the Minimum allowable Factor of Safety (FOS) for the proposed bank armoring is 1.25 and the calculated FOS for the armoring plan provided is 1.26. You may wish to consider revising the bank armoring plan to allow for more than a 0.01 margin of error in Factor of Safety. It seems a little odd to me to provide a FOS for the FOS. The FOS formula requires an average minimum size be used for b50. The size of material committed to in the Bank Armoring plan was 9 to 15 inches with fines mixed in. Twelve (12) inches was chosen, as it is the average size proposed, for use in the formula so the minimum FOS could be calculated. If the average overall riprap size is increased to 13.5 inch average, the F05=1.30. EXHIBIT F - Reclamation Plan Map (Rule 6.4.6): 21) The reclamation plan map will need to be modified as necessary for consistency and accuracy when addressing adequacy revisions. A copy of the revised Exhibit F - Reclamation Plan Map is enclosed. EXHIBIT G -Water Information (Rule 6.4.7): 22) The applicant will need to provide a site characterization and groundwater monitoring plan, including at least five quarters of baseline/background water level and groundwater analytical data, sufficient to demonstrate compliance with the requirements of the "Water Quality Control Commission Regulation No. 41 - The Basic Standards for Groundwater"for the life of the proposed operation. Please note that permanent monitoring wells and Point of Compliance (POC) wells should be placed where they will not be mined through.