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' EXHIBIT 22 <br /> Tetra Tech <br /> agrees with the opinion of the DRMS. Al should continue with the assessment of the <br /> 9 <br /> temporary drain. Tetra Tech believes that much of the standing water on the Orr property, as indicated by <br /> ' the monitoring well data and field observations is related to the surface water in the Bull Seep and water <br /> from the underdrains associated with the Fulton Ditch, two sources over which Al has no control. The <br /> Permanent Drain proposed in the Plan, to the extent practicable, will likely restore the hydrologic regime <br /> to the pre-mining conditions. <br /> Permanent Drain Desiqn <br /> A permanent drain has been designed to convey surface water from the area of concern into the future <br /> reservoir. The drain has an upstream invert elevation of 5036.5. It is expected that the normal water <br /> surface in the wetted area will be approximately the same elevation. Some variation in water surface <br /> elevation may be encountered due to the friction of the vegetation as water flows toward the drain. A <br /> drain design memorandum is attached. The downstream elevation of the drain invert is 5036. <br /> Attachments: Figures <br /> Drain Design Memorandum <br /> ' P 123514\133-23514-16002\Dots\Memos\Orr Property\PrelimDRMS Adaq Rev Orr Property Tt Reply DRAFT Rev3 2016 06 docx <br /> 4 Tetra Tech <br />