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Chapter 4 - Best Management Practices for Erosion and Sediment Control <br /> Horizontal Wells <br /> This system also consists of a series of ditches leading to a sump hole or pump . The ditches <br /> are filled with sand or gravel surrounding a perforated pipe . A geotextile may also be used to <br /> prevent excessive migration of fines into the system . The discharged water must be treated <br /> before release as described above . <br /> Well -point Systems <br /> The well -point system is the preferred system for dewatering and should be used whenever <br /> possible . The initial discharge yields the sediments displaced by the installation of the small <br /> collector pipes . This can be directed into the excavation , a small settling or filtration facility, or <br /> 4W larger temporary impoundment . Thereafter the water is generally clear ground water and may <br /> be discharged into a receiving water body provided that there is suitable conveyance . <br /> No Maintenance <br /> 1 . Any water impoundment must be inspected daily to prevent failure of dikes , berms , or <br /> ,.� control structures . Minor problems should be repaired at once . Major problems will <br /> require a redesign and plan modification . <br /> .. 2 . Any filtration device must be inspected and cleaned frequently. The discharge should <br /> be monitored daily and whenever the pumps are started . Inspection and maintenance <br /> of the system are best performed when the facility is dry. The first signs of diminished <br /> .. performance should be an alarm that maintenance is required . f the facility will no <br /> longer drain itself, the untreated water must be pumped back to its source , rather than <br /> by-passing the facility and discharging to the water body or stormwater system . <br /> 3 . Floating turbidity barriers shall be maintained as per FLOATING TURBIDITY <br /> BARRIER - Section 4 .45 <br /> 4- 115 <br /> i <br />