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1 1 1 LJ 1 1 CI OVERVIEW A Corrective Action Plan (CAP) for certain violations of the Snyder Quarry Permit No. M-77-210 was approved by the Mined Land Reclamation Board at their December 13, 1989 meeting. 'Phe approved plan included a requirement for submittal of final design plans for the proposed sediment basin for review and approval by the MLRD staff prior to construction. The sediment basin 1s located near the old scale site just below the visual berm. This facility will enable the Operator to maintain the necessary Hydr~~logic Balance and Water Quality referenced In the Notice of Violation. The final design is included together with support data relative to the contrit~uting basin, hydrology, hydraulics, and construction procedures. DRAINAGE BASIN The contributing drainage basin has been evaluated In detail in the field and discussed with the Operator. The basin contained in the final design represents a watershed that will actually be contributing to the sediment basins. Some grading within the quarry will be necessary to achieve the desired drainage basin. This grading will occur prior to construction of the sediment facilities. The drainage basin area is included on Exhibit A. The CAP indicated a contributing area that in part currently outfalls ;iouth of the Plant Site and Visual Berm. This flow had been continuing down the "Old Quarry Access Road" as shown on Exhibit B. The CAP intended to divert this Plow across the current access road in the HR-1 culvert and into the sediment pond. The field inspection of the contr[buting drainage area revealed certain areas North of the current access road together with the visual berm were also contributing to the runoff and would likely carry some sediment. These additional areas have been designated as Subbasins A, B and C on Exhibit A. The combination oP the plant site runoff and Areas A=C resulted in a runoff volume greater than the area available to create the sediment b:~sins. The final design includes the regrading of the Plant Site to Intercept all flows that are currently being released South of the Visual Berm ~~uhich eliminates the need for the HR-1 culvert. This regrading has been included on Exhibit D. Some additional site grading within the quarry will also be necessary, however this has been considered an operational grading procedure. In addition to the regrading at the plant site, some minor grading will be completed along the "Old Quarry Road" alignment and this area oP disturbance will be reclaimed. The three subbasins defined as A, B and C of the Drainage Basin Boundary on Exhibit A have been confirmed by field inspection. These areas comprise the watershed areas that are part of the hydrology for the sediment t~asln. Detailed hydrology is contained In the "Design Calculations" section a' this narrative.