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amec <br />As part of the 4" P('PI: installation, a windrmN should be constntcted along the entire length of <br />the pipe using the same detail as presented in Figure 3. <br />Figurc S presents it plan layout of shallow trenches to he cxca\atcd along; the internal access <br />road'bench. The trenches are to he excavated to a mammum depth of y Inches beloN tile emsting <br />I)('I surface and space) approximately 100 fret along the access road. '1 he trenches should sp;In <br />the entire width of the access road. Prior to excmatton of the shallow trench, the area should he <br />scarified it rtuninuun of ? feet from the centerline of each trench to improve percolation. fhc <br />trenches are to he excavated after the area has been scarified. Once the trench has been <br />excavated, a P('PF pipe should he place) to the trench and backtilled N ith D('F and a wlndrim <br />formed above the pipe (see Figure N. Since these are simple collection trenches, any we P('PE <br />pipe may be used in the trenched. <br />RKMInj (r PGTB <br />I'I II a?11111111 RII11 ul n t I C11 C he, <br />h t. pellrenJuular to 4k( CAI toad <br />_ 1 r rnch spacing apprnx 1 cwt ' <br />l <br />Place PCH pipe in trench and <br />` s <br />•' 1,?IUI I'm I appll. Al Ion ?loader pipes -- <br />.. ... <br />Figure 5 Shallmr trench plan <br />Figure 7 presents a general plats shoN ing the area of the DUF that should he scarified. I he <br />purpose of scarifying the DUF is to create it /one of enhanced percolation so that leach solutions <br />will enter the nearby Tertiary pipes. The D(+ should he scaritied to a depth of'4 to S' inches. In <br />addition, N mdntN s should be constntcted upgradtent of any neN and existing; solution Collection <br />pipes within the area to he scarified. <br />It is important to note that the I)('F should only he scarified prior to Installation of anv neN <br />solution Collection pipes to avoid ditmaginc the pipes. \ltndroNs Nould need to he constntcted <br />al.let- Installation of-neN pipes. <br />S WROACY S111BJ m&v ig*l mulmp phase 4 raw aip, h7 dM?n'(Mav! t Nrrupn Wllp ikrc 4