Laserfiche WebLink
amec <br />excavate to the liner surface along the entire extension length, thereby minimizing the risk of <br />damaging the geomembrane liner. At the extension pipe - existing pipe transition point, the <br />extension pipe should be trenched down to within a few inches of the existing Tertiary pipe. Care <br />must be taken to avoid damaging the geomembrane liner. In general, machine excavation should <br />be limited to within 12 inches of the surveyed geomembrane liner surface (as shown on the as- <br />built drawings). It is also important to note that the pipes do not need to be connected, however <br />end caps should be used to prevent DCF from entering the extension pipe. <br />s>dwag d. PCPs `Mdmd 4- Tutl4 D0 to Or dP*d <br />M1 <br />Solution application header tapes <br />wI'? <br />T- <br />Figure 1 Extension of 4" Tertiary pipes <br />Scarify upper 4 to 8 inches along 4" Tertiary pipe Wension <br />alignmert of new pipe <br />DtF Layer Trench down to within a <br />few inches of the existing <br />pipe <br />Note Machine mocaretmn sbodd be lintled to <br />Ede to 4" Tertiary pipe wilbin it Inchas of the geommkrme liner. <br />Hmd mairatim metboda shotald be ued to <br />reach the uieJeS Tertiary p#- <br />e 2 'tertiary pipe extension detail <br />S:\PROJECTS\1193 cc6v gold mining phase 4 dramage\h2 - despn\phase 4 drainage letter doc 2