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ExxonMobil Global Services <br />Colony Shale Oil Ptject <br />ESR Reclamation Studies <br />• Weighing Lysimeter Perfonnance 1990-2003 <br />Project No. 353 <br />Page A-5 <br />A flat plot was constructed to simulate the collection of runoff from an uphill tributary hillside, <br />also at a slope of about 2.6:1. It is an A treatment (base case conceptual pile design cover) with a <br />large tributary area immediately above it, similaz to a full bench height of 50 feet of slope at 2.6:1 <br />facing east. The flat plot was instnunented with neutron probe access tubes and with buried TDRs to <br />measure moisture through seasonal events. <br />The mini-plots are approximately 6 foot long by 2 foot diameter cylinders constructed by <br />welding together two 55 gallon drums, retaining the bottom on the lower dnun, and backfilled with <br />soil proflles of the treatments described above. Some were inshumented with TDRs. The purpose of <br />these was to allow destructive sampling without damaging the plots, to visually see if plant roots <br />might penetrate the amended (vat leached) ESR combusted shale. <br />• The weighing lysimeter is an A treatment (base case conceptual pile design) with a slightly <br />thinner topsoil crust (20 to 22 inches, slightly cambered to allow for drainage). Constructed in a 15 <br />foot diameter by 7 foot deep steel tub supported on a commercial truck scale in a below grade <br />concrete vault. The vault is accessible via a ladder in a manway. The lysimeter's weight is monitored <br />continuously via a load cell on the balance beam of the scale and is checked manually each month. <br />Runofffrom the lysimeter is collected in a 6" wide gravel gutter at the surface of the inside perimeter <br />of the tub, which reports via a drain pipe to a collection bucket in the vault. Percolate is collected in a <br />6" sand drainage layer with slotted PVC piping at the base of the tub, between the bottom of the ESR <br />combusted shale and the steel tank bottom, and flows through the bottom in a drain pipe into a <br />collection bucket in the vault. The runoff and percolate bucket volumes are measured manually on a <br />montlily basis, and samples are taken for water quality tests periodically. <br />A.3 Neutron Probe and TDR Moisture Measurements <br />C] <br />LACI~L FELICE & Associates <br />