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1_5 Zone 5 <br /> Zone 5 consists of areas north of all other zones that have been previously determined to not <br /> require any regrading or modification for stability.No earthwork is planned in this area. <br /> 2. Subsurface Drainage <br /> All subsurface drainage systems will consist of a minimum of 12-inch diameter pipe installed as <br /> shown on Map C-5. This pipe size was determined using the design standards from the Natural <br /> Resource Conservation Service Part NJ650.141 applied to a smooth HDPE pipe. The drainage <br /> area is —17 acres. Inflow pipes (transverse to surface grade)will be perforated while transport <br /> pipes (longitudinal to surface grade) will be solid to convey drainage water to the slope toe. <br /> Additionally,this pipe size is in excess of Ground Engineering's recommendations for pipe size <br /> and flow capacity. <br /> Map C-4 and F-2 show the revised subsurface pipe locations.None of the stormwater designs on <br /> Map C-4 have been changed from the approved permit designs. <br /> 3. Revegetation <br /> All disturbed areas will be revegetated according to the approved permit. Stripped topsoil will be <br /> salvaged for replacement in stockpiles. Temporary sediment control structures will be installed <br /> downgrade of the disturbance areas as shown in the approved permit. <br /> Upon successful revegetation of the disturbance areas related to the 2018 slide, the sediment <br /> control structures will be removed to allow a return of natural drainage paths. <br /> 4. Summary <br /> The earthwork needed to create stable slopes on the west side of the Ralston Quarry was re- <br /> evaluated.New designs were developed to reduce construction scale and safety risk. These new <br /> designs were modelled by Ground Engineering and determined to produce stable slopes. <br /> Therefore, Asphalt Paving Co. is submitting this technical revision to implement these new <br /> designs at the Ralston Quarry. <br /> I Figure 3-3 Subsurface drain discharge from drainage coefficient <br /> Ralston Quarry Slide Repair <br /> (,rM ta•en A,and%sock,PI L( <br /> January 2020 3 <br />