Laserfiche WebLink
October 9, 2009 11 <br />The lateral drain was constructed in accordance with the design submitted to DRMS as part of PR-06. <br />The channel was constructed with a minimum width of 22 feet, with positive drainage. Suitable <br />sandstone fill from the K Ridge area was used for the rock core. This sandstone was sized with a <br />maximum width of 5.5 feet, and did not exceed 25% of the channel width. Additionally, less than 10% of <br />the rock core fill was less than 12 inches in width. The rock was also spot checked with a Schmidt <br />Hammer, and had an estimated compressive strength in excess of 4000 psi. A minimum fill depth of 10 <br />feet was achieved. Upon completion to design specifications, the lateral drain was covered with Mirafi <br />140N filtration fabric. Rolls of fabric with a 15 foot width were used, and a minimum overlap of three <br />feet was used while placing the fabric. The fabric was weighted with rock to prevent wind from <br />substantially altering its placement. The lateral drain has been completed as designed from Station H-1 <br />to Station H-7. <br />Main Orain <br />In addition to the construction of the lateral drain, construction began on the main underdrain. The <br />channel was cut to the specified dimensions and rock fill of suitable size and quality was placed. <br />Construction methods were consistent with those described previously for the lateral drain. <br />Photograph 15 below shows the channel from Station M-1 through M-4. Photograph 16 shows Stations <br />M-9 through M-4. Photograph 17 shows Stations M-10 through M-27. Photograph 18 shows initial <br />placement of rock fill in the main drain from Station M-1 to M-8. <br />41 <br />Ai? 1.4 <br />• .? ? fit. - ?? ? u. •1y.+.: Sys . T?? ...: <br />r <br />r.. . • . ,. .M . • ... <br />Photograph 15: Looking North from M-1 (7121109) <br />