Laserfiche WebLink
Job No: s60100-003,:U Client: L-&Velbt►a¢l RtA4CW Page i ._ 6 <br /> TELEST MXa ��'w�. _Task:1w•taatr4tsr _-Computed Byrn/. Ne Date: I/5/1,9 <br /> SOLUTIONS* IN CORPORATE D <br /> MWOM Checked By:_ -- Date:!- <br /> Calculation Documentation <br /> Problem Statement: <br /> Loveland Ready-Mix Concrete Inc. (LRM) received approval from the agencies to mine the Knox Pit <br /> at their LaPorte Operations. Dewatering during the initial part of Phase 1 may cause significant <br /> groundwater drawdown beneath the Tilley property, which is located west of the Knox Pit. The <br /> Tilley's are concerned that drawdown could affect their trees if drawdown persists over the growing <br /> season. LRM proposed a conceptual mitigation strategy to reduce drawdown during the Phase 1 <br /> operations. <br /> Objectives: <br /> 1. Evaluate the conceptual mitigation strategy (i.e., reverse French drains or "Infiltrators")to <br /> determine their <br /> a. Size and location <br /> b. Potential effectiveness <br /> Approach: <br /> 1. Build an analytical element groundwater sub-model from the numerical groundwater flow <br /> model for ease of calculation <br /> 2. Use the sub-model to test that the increase in head at the infiltrator (located coincident to <br /> the relocated West Fort Collins Water District water line) provides adequate mitigation <br /> 3. Back-calculate the flow capacity of the infiltrator to ensure it has adequate capacity <br /> Data and Assumptions: <br /> 1. Numerical groundwaterflow <br /> model 6 In. Perforated Drain <br /> 2. 6" corrugated and perforate Pipe, Single Wall, Hdpe, <br /> pipe (see design drawing) 100 Ft. <br /> DpscnptWn More Into:ma:in ke.itn:1'il <br /> Ttws 61nch Pvfm$etl Dravwge Pipe is usetl,va[wus agricultural an home appkatm TO help you control water flow. <br /> dnbtEuhon arM zu0 drainage.TM drain qpe can he usetl!or tliainage in(ouridatwnz retaining walls an0 more. <br /> The Main qpe n a heavy dury corrugated single wall and constructed of high densay polyethylene fHDPE).The slot• <br /> Homage pipe 1s 100 feet long.Constructed of nDPE.Tnrs hgntweight flexiltle drainage pipe rs corrosive and[hemcal <br /> rlS Wt. <br /> 5pecd%atom <br /> •AD5006010100 <br /> •6m%f00q <br /> •Anrwlar Corrugated Smgle_I <br /> •Slot Per}oratgn 0.8]S In.z 0.1201n. <br /> nk1 Brea I.O ln?Rt <br /> • 120-3 SW PeAaratbn Pattern Rotated W-Every Other Valley <br /> HDPE <br /> AS—1405 <br />