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reclamation slope area. Other areas subject to traffic loading have cover in excess of 1 foot. <br /> The outlet pipes will have heavy duty flap gates to allow flow out of the reservoir only. <br /> No estimate for capacity was made due to the unpredictability of flow in the area and its location within a floodplain. <br /> Flows through the culverts will be dependent on the difference in water surface elevations on either side of the <br /> culvert. Topographic survey, provided by Aggregate Industries on August 22, 2016, showed that the current water <br /> surface elevation within Bull Seep near the downstream end of the outlet pipes was at elevation 5036.61. <br /> Improvements further downstream on the Bull Seep may be required to allow for drainage of Hazeltine Reservoir <br /> through the outlet pipes. <br /> The pipe is bedded in flowable fill for better compaction than soil under the pipe haunches, reducing the risk of <br /> seepage along the conduit, which can cause embankment failure when water surfaces in the reservoir are elevated. <br /> Compacted overburden (and/or other materials)with a minimum 40% passing the No. 200 sieve classifying as CL, <br /> CH, or SC soils may be used for backfill above the top of flowable fill. Backfill would be compacted to 95% of the <br /> standard proctor density. <br /> Attachments: Calculations <br /> Plan-set <br /> P:\23514\133-23514-16002\Docs\Memos\Orr Property\160824 Orr Drain Memo.docx <br />